I don't know if anyone gets excited as I do about electric motorbikes, but
if you do the TTXGP is coming to Brissie! Wooo!!
The official site is http://www.egrandprix.com/, but the guys at
evmotorcycle.org have better info and coverage on the oz contenders. There
are only a few teams in Australia, and the main two are the ripperton and
catavolt teams. SO keen to perve on the bikes and watch them run, albeit
for not very long (races are only one lap I think).
Should help to enthuse me to get into my ev conversion!
> I don't know if anyone gets excited as I do about electric motorbikes, but
> if you do the TTXGP is coming to Brissie! Wooo!!
> The official site is http://www.egrandprix.com/, but the guys at
> evmotorcycle.org have better info and coverage on the oz contenders.
> There are only a few teams in Australia, and the main two are the
> ripperton and catavolt teams. SO keen to perve on the bikes and watch them
> run, albeit for not very long (races are only one lap I think).
> Should help to enthuse me to get into my ev conversion!
> --
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On Wed, Jun 13, 2012 at 6:06 PM, tjhowse <tjho...@gmail.com> wrote:
> We should turn up with one of those electric scooters and a pile of 12v
> SLA batteries.
> On 13 June 2012 18:01, Sam Knight <sam.knigh...@gmail.com> wrote:
>> I don't know if anyone gets excited as I do about electric motorbikes,
>> but if you do the TTXGP is coming to Brissie! Wooo!!
>> The official site is http://www.egrandprix.com/, but the guys at
>> evmotorcycle.org have better info and coverage on the oz contenders.
>> There are only a few teams in Australia, and the main two are the
>> ripperton and catavolt teams. SO keen to perve on the bikes and watch them
>> run, albeit for not very long (races are only one lap I think).
>> Should help to enthuse me to get into my ev conversion!
>> --
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> on an upside you could charge the first flat batt and use it by the end of
> the race.
> On Wed, Jun 13, 2012 at 6:06 PM, tjhowse <tjho...@gmail.com> wrote:
>> We should turn up with one of those electric scooters and a pile of 12v
>> SLA batteries.
>> On 13 June 2012 18:01, Sam Knight <sam.knigh...@gmail.com> wrote:
>>> I don't know if anyone gets excited as I do about electric motorbikes,
>>> but if you do the TTXGP is coming to Brissie! Wooo!!
>>> The official site is http://www.egrandprix.com/, but the guys at
>>> evmotorcycle.org have better info and coverage on the oz contenders.
>>> There are only a few teams in Australia, and the main two are the
>>> ripperton and catavolt teams. SO keen to perve on the bikes and watch them
>>> run, albeit for not very long (races are only one lap I think).
>>> Should help to enthuse me to get into my ev conversion!
>>> --
>>> You received this message because you are subscribed to the Google
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On Wed, Jun 13, 2012 at 6:12 PM, Lemming . <inert...@gmail.com> wrote:
> We could look at doing a serious entry, Hobbyking sell some pretty
> insanely powerful motors now, and all we'd need is some big LiPo's to go
> with.
> I do believe buzz even has a spare motorbike frame that could be adapted
> to it :-D
> On 13 June 2012 18:11, Jimmy Bowler <denomina...@gmail.com> wrote:
>> Pit stop with batt change every lap
>> on an upside you could charge the first flat batt and use it by the end
>> of the race.
>> On Wed, Jun 13, 2012 at 6:06 PM, tjhowse <tjho...@gmail.com> wrote:
>>> We should turn up with one of those electric scooters and a pile of 12v
>>> SLA batteries.
>>> On 13 June 2012 18:01, Sam Knight <sam.knigh...@gmail.com> wrote:
>>>> I don't know if anyone gets excited as I do about electric motorbikes,
>>>> but if you do the TTXGP is coming to Brissie! Wooo!!
>>>> The official site is http://www.egrandprix.com/, but the guys at
>>>> evmotorcycle.org have better info and coverage on the oz contenders.
>>>> There are only a few teams in Australia, and the main two are the
>>>> ripperton and catavolt teams. SO keen to perve on the bikes and watch them
>>>> run, albeit for not very long (races are only one lap I think).
>>>> Should help to enthuse me to get into my ev conversion!
>>>> --
>>>> You received this message because you are subscribed to the Google
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> We should turn up with one of those electric scooters and a pile of 12v SLA
> batteries.
> On 13 June 2012 18:01, Sam Knight <sam.knigh...@gmail.com> wrote:
>> I don't know if anyone gets excited as I do about electric motorbikes, but
>> if you do the TTXGP is coming to Brissie! Wooo!!
>> The official site is http://www.egrandprix.com/, but the guys at
>> evmotorcycle.org have better info and coverage on the oz contenders. There
>> are only a few teams in Australia, and the main two are the ripperton and
>> catavolt teams. SO keen to perve on the bikes and watch them run, albeit
>> for not very long (races are only one lap I think).
>> Should help to enthuse me to get into my ev conversion!
>> --
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Here's some pics by the way, if anyone is interested in my canary yellow
beast. I'm just mounting the motor now, and saving for the lithiums! I
should be able to get a good 25Kw out of that motor, and fit a good 4 Kw/h
pack on the thing, but those racing guys are talking something like 60Kw
and 20 Kw/h packs! Crazy.
On Wed, Jun 13, 2012 at 6:30 PM, James Churchill <pel...@gmail.com> wrote:
> And Rohan in his Joker coat to ride it.
> - James
> On 13 June 2012 18:06, tjhowse <tjho...@gmail.com> wrote:
> > We should turn up with one of those electric scooters and a pile of 12v
> SLA
> > batteries.
> > On 13 June 2012 18:01, Sam Knight <sam.knigh...@gmail.com> wrote:
> >> I don't know if anyone gets excited as I do about electric motorbikes,
> but
> >> if you do the TTXGP is coming to Brissie! Wooo!!
> >> The official site is http://www.egrandprix.com/, but the guys at
> >> evmotorcycle.org have better info and coverage on the oz contenders.
> There
> >> are only a few teams in Australia, and the main two are the ripperton
> and
> >> catavolt teams. SO keen to perve on the bikes and watch them run,
> albeit
> >> for not very long (races are only one lap I think).
> >> Should help to enthuse me to get into my ev conversion!
> >> --
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The part that seems the hardest to source to me is the speed controller for
the big motor...? I assum big electric motors are pretty easy to find
( eg in electric golf carts and the like ) , but what do people do for
ESC/s to drive them? ( assuming we don't want to shell out large $$ for a
comercial unit, of course)
Also, what sort of motor and "black box"( speed controller?) is that
Sam?
On 13 June 2012 18:43, Sam Knight <sam.knigh...@gmail.com> wrote:
> Here's some pics by the way, if anyone is interested in my canary yellow
> beast. I'm just mounting the motor now, and saving for the lithiums! I
> should be able to get a good 25Kw out of that motor, and fit a good 4 Kw/h
> pack on the thing, but those racing guys are talking something like 60Kw
> and 20 Kw/h packs! Crazy.
> On Wed, Jun 13, 2012 at 6:30 PM, James Churchill <pel...@gmail.com> wrote:
>> And Rohan in his Joker coat to ride it.
>> - James
>> On 13 June 2012 18:06, tjhowse <tjho...@gmail.com> wrote:
>> > We should turn up with one of those electric scooters and a pile of 12v
>> SLA
>> > batteries.
>> > On 13 June 2012 18:01, Sam Knight <sam.knigh...@gmail.com> wrote:
>> >> I don't know if anyone gets excited as I do about electric motorbikes,
>> but
>> >> if you do the TTXGP is coming to Brissie! Wooo!!
>> >> The official site is http://www.egrandprix.com/, but the guys at
>> >> evmotorcycle.org have better info and coverage on the oz contenders.
>> There
>> >> are only a few teams in Australia, and the main two are the ripperton
>> and
>> >> catavolt teams. SO keen to perve on the bikes and watch them run,
>> albeit
>> >> for not very long (races are only one lap I think).
>> >> Should help to enthuse me to get into my ev conversion!
>> >> --
>> >> You received this message because you are subscribed to the Google
>> Groups
>> >> "hackerspace_brisbane" group.
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>> >> hackerspace_brisbane@googlegroups.com.
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Most people either use zillas or forklift controllers because that's the
power rating you're looking at. There's a big market for high-powered
controllers in the states, with watercooled control units not being out of
the ordinary. Custom ones aren't hard to make if you're looking for
something without traction control... it's basically "dump current here,
have an off switch".
James
On 13 June 2012 19:33, buzz <davidb...@gmail.com> wrote:
> The part that seems the hardest to source to me is the speed controller
> for the big motor...? I assum big electric motors are pretty easy to
> find ( eg in electric golf carts and the like ) , but what do people do for
> ESC/s to drive them? ( assuming we don't want to shell out large $$ for a
> comercial unit, of course)
> Also, what sort of motor and "black box"( speed controller?) is that
> Sam?
> On 13 June 2012 18:43, Sam Knight <sam.knigh...@gmail.com> wrote:
>> Here's some pics by the way, if anyone is interested in my canary yellow
>> beast. I'm just mounting the motor now, and saving for the lithiums! I
>> should be able to get a good 25Kw out of that motor, and fit a good 4 Kw/h
>> pack on the thing, but those racing guys are talking something like 60Kw
>> and 20 Kw/h packs! Crazy.
>> On Wed, Jun 13, 2012 at 6:30 PM, James Churchill <pel...@gmail.com>wrote:
>>> And Rohan in his Joker coat to ride it.
>>> - James
>>> On 13 June 2012 18:06, tjhowse <tjho...@gmail.com> wrote:
>>> > We should turn up with one of those electric scooters and a pile of
>>> 12v SLA
>>> > batteries.
>>> > On 13 June 2012 18:01, Sam Knight <sam.knigh...@gmail.com> wrote:
>>> >> I don't know if anyone gets excited as I do about electric
>>> motorbikes, but
>>> >> if you do the TTXGP is coming to Brissie! Wooo!!
>>> >> The official site is http://www.egrandprix.com/, but the guys at
>>> >> evmotorcycle.org have better info and coverage on the oz contenders.
>>> There
>>> >> are only a few teams in Australia, and the main two are the ripperton
>>> and
>>> >> catavolt teams. SO keen to perve on the bikes and watch them run,
>>> albeit
>>> >> for not very long (races are only one lap I think).
>>> >> Should help to enthuse me to get into my ev conversion!
>>> >> --
>>> >> You received this message because you are subscribed to the Google
>>> Groups
>>> >> "hackerspace_brisbane" group.
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>>> >> hackerspace_brisbane@googlegroups.com.
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That's a Curtis 1221C - it's rated at 120V, 400 amps for a short interval,
150 amps continuous. But the motor is only rated to 72 volts. There are a
bunch of guys at the aeva meetings who reckon I could run it at a higher
voltage, but I dunno, I don't want to burn it out. All the gear can be got
at evworks.com, they are based out of perth.
On Wed, Jun 13, 2012 at 7:53 PM, James Hodgkinson <yale...@ricetek.net>wrote:
> Most people either use zillas or forklift controllers because that's the
> power rating you're looking at. There's a big market for high-powered
> controllers in the states, with watercooled control units not being out of
> the ordinary. Custom ones aren't hard to make if you're looking for
> something without traction control... it's basically "dump current here,
> have an off switch".
> James
> On 13 June 2012 19:33, buzz <davidb...@gmail.com> wrote:
>> The part that seems the hardest to source to me is the speed controller
>> for the big motor...? I assum big electric motors are pretty easy to
>> find ( eg in electric golf carts and the like ) , but what do people do for
>> ESC/s to drive them? ( assuming we don't want to shell out large $$ for a
>> comercial unit, of course)
>> Also, what sort of motor and "black box"( speed controller?) is that
>> Sam?
>> On 13 June 2012 18:43, Sam Knight <sam.knigh...@gmail.com> wrote:
>>> Here's some pics by the way, if anyone is interested in my canary yellow
>>> beast. I'm just mounting the motor now, and saving for the lithiums! I
>>> should be able to get a good 25Kw out of that motor, and fit a good 4 Kw/h
>>> pack on the thing, but those racing guys are talking something like 60Kw
>>> and 20 Kw/h packs! Crazy.
>>> On Wed, Jun 13, 2012 at 6:30 PM, James Churchill <pel...@gmail.com>wrote:
>>>> And Rohan in his Joker coat to ride it.
>>>> - James
>>>> On 13 June 2012 18:06, tjhowse <tjho...@gmail.com> wrote:
>>>> > We should turn up with one of those electric scooters and a pile of
>>>> 12v SLA
>>>> > batteries.
>>>> > On 13 June 2012 18:01, Sam Knight <sam.knigh...@gmail.com> wrote:
>>>> >> I don't know if anyone gets excited as I do about electric
>>>> motorbikes, but
>>>> >> if you do the TTXGP is coming to Brissie! Wooo!!
>>>> >> The official site is http://www.egrandprix.com/, but the guys at
>>>> >> evmotorcycle.org have better info and coverage on the oz
>>>> contenders. There
>>>> >> are only a few teams in Australia, and the main two are the
>>>> ripperton and
>>>> >> catavolt teams. SO keen to perve on the bikes and watch them run,
>>>> albeit
>>>> >> for not very long (races are only one lap I think).
>>>> >> Should help to enthuse me to get into my ev conversion!
>>>> >> --
>>>> >> You received this message because you are subscribed to the Google
>>>> Groups
>>>> >> "hackerspace_brisbane" group.
>>>> >> To post to this group, send email to
>>>> >> hackerspace_brisbane@googlegroups.com.
>>>> >> To unsubscribe from this group, send email to
>>>> >> hackerspace_brisbane+unsubscribe@googlegroups.com.
>>>> >> For more options, visit this group at
>>>> >> http://groups.google.com/group/hackerspace_brisbane?hl=en.
>>>> > --
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I think it is easy to find big heavy inefficient motors, but only recently
people have been bringing out higher efficiency brushless dc permanent
magnets and AC motors more suited for high speed, high current draw
applications. My motor is pretty inefficient at high draw, cause it's
series DC, but it's the best value for money at the moment. I've got a
performance sheet attached.
On Wed, Jun 13, 2012 at 9:16 PM, Sam Knight <sam.knigh...@gmail.com> wrote:
> That's a Curtis 1221C - it's rated at 120V, 400 amps for a short interval,
> 150 amps continuous. But the motor is only rated to 72 volts. There are a
> bunch of guys at the aeva meetings who reckon I could run it at a higher
> voltage, but I dunno, I don't want to burn it out. All the gear can be got
> at evworks.com, they are based out of perth.
> On Wed, Jun 13, 2012 at 7:53 PM, James Hodgkinson <yale...@ricetek.net>wrote:
>> Most people either use zillas or forklift controllers because that's the
>> power rating you're looking at. There's a big market for high-powered
>> controllers in the states, with watercooled control units not being out of
>> the ordinary. Custom ones aren't hard to make if you're looking for
>> something without traction control... it's basically "dump current here,
>> have an off switch".
>> James
>> On 13 June 2012 19:33, buzz <davidb...@gmail.com> wrote:
>>> The part that seems the hardest to source to me is the speed controller
>>> for the big motor...? I assum big electric motors are pretty easy to
>>> find ( eg in electric golf carts and the like ) , but what do people do for
>>> ESC/s to drive them? ( assuming we don't want to shell out large $$ for a
>>> comercial unit, of course)
>>> Also, what sort of motor and "black box"( speed controller?) is that
>>> Sam?
>>> On 13 June 2012 18:43, Sam Knight <sam.knigh...@gmail.com> wrote:
>>>> Here's some pics by the way, if anyone is interested in my canary
>>>> yellow beast. I'm just mounting the motor now, and saving for the
>>>> lithiums! I should be able to get a good 25Kw out of that motor, and fit a
>>>> good 4 Kw/h pack on the thing, but those racing guys are talking something
>>>> like 60Kw and 20 Kw/h packs! Crazy.
>>>> On Wed, Jun 13, 2012 at 6:30 PM, James Churchill <pel...@gmail.com>wrote:
>>>>> And Rohan in his Joker coat to ride it.
>>>>> - James
>>>>> On 13 June 2012 18:06, tjhowse <tjho...@gmail.com> wrote:
>>>>> > We should turn up with one of those electric scooters and a pile of
>>>>> 12v SLA
>>>>> > batteries.
>>>>> > On 13 June 2012 18:01, Sam Knight <sam.knigh...@gmail.com> wrote:
>>>>> >> I don't know if anyone gets excited as I do about electric
>>>>> motorbikes, but
>>>>> >> if you do the TTXGP is coming to Brissie! Wooo!!
>>>>> >> The official site is http://www.egrandprix.com/, but the guys at
>>>>> >> evmotorcycle.org have better info and coverage on the oz
>>>>> contenders. There
>>>>> >> are only a few teams in Australia, and the main two are the
>>>>> ripperton and
>>>>> >> catavolt teams. SO keen to perve on the bikes and watch them run,
>>>>> albeit
>>>>> >> for not very long (races are only one lap I think).
>>>>> >> Should help to enthuse me to get into my ev conversion!
>>>>> >> --
>>>>> >> You received this message because you are subscribed to the Google
>>>>> Groups
>>>>> >> "hackerspace_brisbane" group.
>>>>> >> To post to this group, send email to
>>>>> >> hackerspace_brisbane@googlegroups.com.
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>>>>> > --
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Sam the votage is not a problem the speed controller will sort that out
with the current just like the stepper motor on reprap its the current you
have to worry about.
On Wed, Jun 13, 2012 at 9:20 PM, Sam Knight <sam.knigh...@gmail.com> wrote:
> I think it is easy to find big heavy inefficient motors, but only recently
> people have been bringing out higher efficiency brushless dc permanent
> magnets and AC motors more suited for high speed, high current draw
> applications. My motor is pretty inefficient at high draw, cause it's
> series DC, but it's the best value for money at the moment. I've got a
> performance sheet attached.
> On Wed, Jun 13, 2012 at 9:16 PM, Sam Knight <sam.knigh...@gmail.com>wrote:
>> That's a Curtis 1221C - it's rated at 120V, 400 amps for a short
>> interval, 150 amps continuous. But the motor is only rated to 72 volts.
>> There are a bunch of guys at the aeva meetings who reckon I could run it
>> at a higher voltage, but I dunno, I don't want to burn it out. All the
>> gear can be got at evworks.com, they are based out of perth.
>> On Wed, Jun 13, 2012 at 7:53 PM, James Hodgkinson <yale...@ricetek.net>wrote:
>>> Most people either use zillas or forklift controllers because that's the
>>> power rating you're looking at. There's a big market for high-powered
>>> controllers in the states, with watercooled control units not being out of
>>> the ordinary. Custom ones aren't hard to make if you're looking for
>>> something without traction control... it's basically "dump current here,
>>> have an off switch".
>>> James
>>> On 13 June 2012 19:33, buzz <davidb...@gmail.com> wrote:
>>>> The part that seems the hardest to source to me is the speed controller
>>>> for the big motor...? I assum big electric motors are pretty easy to
>>>> find ( eg in electric golf carts and the like ) , but what do people do for
>>>> ESC/s to drive them? ( assuming we don't want to shell out large $$ for a
>>>> comercial unit, of course)
>>>> Also, what sort of motor and "black box"( speed controller?) is that
>>>> Sam?
>>>> On 13 June 2012 18:43, Sam Knight <sam.knigh...@gmail.com> wrote:
>>>>> Here's some pics by the way, if anyone is interested in my canary
>>>>> yellow beast. I'm just mounting the motor now, and saving for the
>>>>> lithiums! I should be able to get a good 25Kw out of that motor, and fit a
>>>>> good 4 Kw/h pack on the thing, but those racing guys are talking something
>>>>> like 60Kw and 20 Kw/h packs! Crazy.
>>>>> On Wed, Jun 13, 2012 at 6:30 PM, James Churchill <pel...@gmail.com>wrote:
>>>>>> And Rohan in his Joker coat to ride it.
>>>>>> - James
>>>>>> On 13 June 2012 18:06, tjhowse <tjho...@gmail.com> wrote:
>>>>>> > We should turn up with one of those electric scooters and a pile of
>>>>>> 12v SLA
>>>>>> > batteries.
>>>>>> > On 13 June 2012 18:01, Sam Knight <sam.knigh...@gmail.com> wrote:
>>>>>> >> I don't know if anyone gets excited as I do about electric
>>>>>> motorbikes, but
>>>>>> >> if you do the TTXGP is coming to Brissie! Wooo!!
>>>>>> >> The official site is http://www.egrandprix.com/, but the guys at
>>>>>> >> evmotorcycle.org have better info and coverage on the oz
>>>>>> contenders. There
>>>>>> >> are only a few teams in Australia, and the main two are the
>>>>>> ripperton and
>>>>>> >> catavolt teams. SO keen to perve on the bikes and watch them run,
>>>>>> albeit
>>>>>> >> for not very long (races are only one lap I think).
>>>>>> >> Should help to enthuse me to get into my ev conversion!
>>>>>> >> --
>>>>>> >> You received this message because you are subscribed to the Google
>>>>>> Groups
>>>>>> >> "hackerspace_brisbane" group.
>>>>>> >> To post to this group, send email to
>>>>>> >> hackerspace_brisbane@googlegroups.com.
>>>>>> >> To unsubscribe from this group, send email to
>>>>>> >> hackerspace_brisbane+unsubscribe@googlegroups.com.
>>>>>> >> For more options, visit this group at
>>>>>> >> http://groups.google.com/group/hackerspace_brisbane?hl=en.
>>>>>> > --
>>>>>> > You received this message because you are subscribed to the Google
>>>>>> Groups
>>>>>> > "hackerspace_brisbane" group.
>>>>>> > To post to this group, send email to
>>>>>> hackerspace_brisbane@googlegroups.com.
>>>>>> > To unsubscribe from this group, send email to
>>>>>> > hackerspace_brisbane+unsubscribe@googlegroups.com.
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>>>>>> > http://groups.google.com/group/hackerspace_brisbane?hl=en.
>>>>>> --
>>>>>> You received this message because you are subscribed to the Google
>>>>>> Groups "hackerspace_brisbane" group.
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>>>>>> To unsubscribe from this group, send email to
>>>>>> hackerspace_brisbane+unsubscribe@googlegroups.com.
>>>>>> For more options, visit this group at
>>>>>> http://groups.google.com/group/hackerspace_brisbane?hl=en.
>>>>> --
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Yeeeah right okay, so that's why I don't have to change any settings or
anything on my controller to run at a different voltage - it's just going
to put it's 400 amps in, and the motor will find it's own voltage, right?
I'm obviously not an electrical guy, I'm just getting my head around it
all at this stage.
On Wed, Jun 13, 2012 at 10:10 PM, Jimmy Bowler <denomina...@gmail.com>wrote:
> Sam the votage is not a problem the speed controller will sort that out
> with the current just like the stepper motor on reprap its the current you
> have to worry about.
> On Wed, Jun 13, 2012 at 9:20 PM, Sam Knight <sam.knigh...@gmail.com>wrote:
>> I think it is easy to find big heavy inefficient motors, but only
>> recently people have been bringing out higher efficiency brushless dc
>> permanent magnets and AC motors more suited for high speed, high current
>> draw applications. My motor is pretty inefficient at high draw, cause it's
>> series DC, but it's the best value for money at the moment. I've got a
>> performance sheet attached.
>> On Wed, Jun 13, 2012 at 9:16 PM, Sam Knight <sam.knigh...@gmail.com>wrote:
>>> That's a Curtis 1221C - it's rated at 120V, 400 amps for a short
>>> interval, 150 amps continuous. But the motor is only rated to 72 volts.
>>> There are a bunch of guys at the aeva meetings who reckon I could run it
>>> at a higher voltage, but I dunno, I don't want to burn it out. All the
>>> gear can be got at evworks.com, they are based out of perth.
>>> On Wed, Jun 13, 2012 at 7:53 PM, James Hodgkinson <yale...@ricetek.net>wrote:
>>>> Most people either use zillas or forklift controllers because that's
>>>> the power rating you're looking at. There's a big market for high-powered
>>>> controllers in the states, with watercooled control units not being out of
>>>> the ordinary. Custom ones aren't hard to make if you're looking for
>>>> something without traction control... it's basically "dump current here,
>>>> have an off switch".
>>>> James
>>>> On 13 June 2012 19:33, buzz <davidb...@gmail.com> wrote:
>>>>> The part that seems the hardest to source to me is the speed
>>>>> controller for the big motor...? I assum big electric motors are
>>>>> pretty easy to find ( eg in electric golf carts and the like ) , but what
>>>>> do people do for ESC/s to drive them? ( assuming we don't want to shell
>>>>> out large $$ for a comercial unit, of course)
>>>>> Also, what sort of motor and "black box"( speed controller?) is that
>>>>> Sam?
>>>>> On 13 June 2012 18:43, Sam Knight <sam.knigh...@gmail.com> wrote:
>>>>>> Here's some pics by the way, if anyone is interested in my canary
>>>>>> yellow beast. I'm just mounting the motor now, and saving for the
>>>>>> lithiums! I should be able to get a good 25Kw out of that motor, and fit a
>>>>>> good 4 Kw/h pack on the thing, but those racing guys are talking something
>>>>>> like 60Kw and 20 Kw/h packs! Crazy.
>>>>>> On Wed, Jun 13, 2012 at 6:30 PM, James Churchill <pel...@gmail.com>wrote:
>>>>>>> And Rohan in his Joker coat to ride it.
>>>>>>> - James
>>>>>>> On 13 June 2012 18:06, tjhowse <tjho...@gmail.com> wrote:
>>>>>>> > We should turn up with one of those electric scooters and a pile
>>>>>>> of 12v SLA
>>>>>>> > batteries.
>>>>>>> > On 13 June 2012 18:01, Sam Knight <sam.knigh...@gmail.com> wrote:
>>>>>>> >> I don't know if anyone gets excited as I do about electric
>>>>>>> motorbikes, but
>>>>>>> >> if you do the TTXGP is coming to Brissie! Wooo!!
>>>>>>> >> The official site is http://www.egrandprix.com/, but the guys at
>>>>>>> >> evmotorcycle.org have better info and coverage on the oz
>>>>>>> contenders. There
>>>>>>> >> are only a few teams in Australia, and the main two are the
>>>>>>> ripperton and
>>>>>>> >> catavolt teams. SO keen to perve on the bikes and watch them
>>>>>>> run, albeit
>>>>>>> >> for not very long (races are only one lap I think).
>>>>>>> >> Should help to enthuse me to get into my ev conversion!
>>>>>>> >> --
>>>>>>> >> You received this message because you are subscribed to the
>>>>>>> Google Groups
>>>>>>> >> "hackerspace_brisbane" group.
>>>>>>> >> To post to this group, send email to
>>>>>>> >> hackerspace_brisbane@googlegroups.com.
>>>>>>> >> To unsubscribe from this group, send email to
>>>>>>> >> hackerspace_brisbane+unsubscribe@googlegroups.com.
>>>>>>> >> For more options, visit this group at
>>>>>>> >> http://groups.google.com/group/hackerspace_brisbane?hl=en.
>>>>>>> > --
>>>>>>> > You received this message because you are subscribed to the Google
>>>>>>> Groups
>>>>>>> > "hackerspace_brisbane" group.
>>>>>>> > To post to this group, send email to
>>>>>>> hackerspace_brisbane@googlegroups.com.
>>>>>>> > To unsubscribe from this group, send email to
>>>>>>> > hackerspace_brisbane+unsubscribe@googlegroups.com.
>>>>>>> > For more options, visit this group at
>>>>>>> > http://groups.google.com/group/hackerspace_brisbane?hl=en.
>>>>>>> --
>>>>>>> You received this message because you are subscribed to the Google
>>>>>>> Groups "hackerspace_brisbane" group.
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>>>>>>> To unsubscribe from this group, send email to
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>>>>>> --
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>>>>> --
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No, the motor will draw as much amperage it needs at a given voltage.
I.e. a 2kw motor will draw 100A at 20v, or 20A at 100v
So long as the controller can handle the voltage, it is always better to go
for a high voltage, but higher voltage often means trading off for lower
battery capacity as you need to put more cells in series to obtain the
requisite voltage.
On 13 June 2012 22:23, Sam Knight <sam.knigh...@gmail.com> wrote:
> Yeeeah right okay, so that's why I don't have to change any settings or
> anything on my controller to run at a different voltage - it's just going
> to put it's 400 amps in, and the motor will find it's own voltage, right?
> I'm obviously not an electrical guy, I'm just getting my head around it
> all at this stage.
> On Wed, Jun 13, 2012 at 10:10 PM, Jimmy Bowler <denomina...@gmail.com>wrote:
>> Sam the votage is not a problem the speed controller will sort that out
>> with the current just like the stepper motor on reprap its the current you
>> have to worry about.
>> On Wed, Jun 13, 2012 at 9:20 PM, Sam Knight <sam.knigh...@gmail.com>wrote:
>>> I think it is easy to find big heavy inefficient motors, but only
>>> recently people have been bringing out higher efficiency brushless dc
>>> permanent magnets and AC motors more suited for high speed, high current
>>> draw applications. My motor is pretty inefficient at high draw, cause it's
>>> series DC, but it's the best value for money at the moment. I've got a
>>> performance sheet attached.
>>> On Wed, Jun 13, 2012 at 9:16 PM, Sam Knight <sam.knigh...@gmail.com>wrote:
>>>> That's a Curtis 1221C - it's rated at 120V, 400 amps for a short
>>>> interval, 150 amps continuous. But the motor is only rated to 72 volts.
>>>> There are a bunch of guys at the aeva meetings who reckon I could run it
>>>> at a higher voltage, but I dunno, I don't want to burn it out. All the
>>>> gear can be got at evworks.com, they are based out of perth.
>>>> On Wed, Jun 13, 2012 at 7:53 PM, James Hodgkinson <yale...@ricetek.net>wrote:
>>>>> Most people either use zillas or forklift controllers because that's
>>>>> the power rating you're looking at. There's a big market for high-powered
>>>>> controllers in the states, with watercooled control units not being out of
>>>>> the ordinary. Custom ones aren't hard to make if you're looking for
>>>>> something without traction control... it's basically "dump current here,
>>>>> have an off switch".
>>>>> James
>>>>> On 13 June 2012 19:33, buzz <davidb...@gmail.com> wrote:
>>>>>> The part that seems the hardest to source to me is the speed
>>>>>> controller for the big motor...? I assum big electric motors are
>>>>>> pretty easy to find ( eg in electric golf carts and the like ) , but what
>>>>>> do people do for ESC/s to drive them? ( assuming we don't want to shell
>>>>>> out large $$ for a comercial unit, of course)
>>>>>> Also, what sort of motor and "black box"( speed controller?) is that
>>>>>> Sam?
>>>>>> On 13 June 2012 18:43, Sam Knight <sam.knigh...@gmail.com> wrote:
>>>>>>> Here's some pics by the way, if anyone is interested in my canary
>>>>>>> yellow beast. I'm just mounting the motor now, and saving for the
>>>>>>> lithiums! I should be able to get a good 25Kw out of that motor, and fit a
>>>>>>> good 4 Kw/h pack on the thing, but those racing guys are talking something
>>>>>>> like 60Kw and 20 Kw/h packs! Crazy.
>>>>>>> On Wed, Jun 13, 2012 at 6:30 PM, James Churchill <pel...@gmail.com>wrote:
>>>>>>>> And Rohan in his Joker coat to ride it.
>>>>>>>> - James
>>>>>>>> On 13 June 2012 18:06, tjhowse <tjho...@gmail.com> wrote:
>>>>>>>> > We should turn up with one of those electric scooters and a pile
>>>>>>>> of 12v SLA
>>>>>>>> > batteries.
>>>>>>>> > On 13 June 2012 18:01, Sam Knight <sam.knigh...@gmail.com> wrote:
>>>>>>>> >> I don't know if anyone gets excited as I do about electric
>>>>>>>> motorbikes, but
>>>>>>>> >> if you do the TTXGP is coming to Brissie! Wooo!!
>>>>>>>> >> The official site is http://www.egrandprix.com/, but the guys at
>>>>>>>> >> evmotorcycle.org have better info and coverage on the oz
>>>>>>>> contenders. There
>>>>>>>> >> are only a few teams in Australia, and the main two are the
>>>>>>>> ripperton and
>>>>>>>> >> catavolt teams. SO keen to perve on the bikes and watch them
>>>>>>>> run, albeit
>>>>>>>> >> for not very long (races are only one lap I think).
>>>>>>>> >> Should help to enthuse me to get into my ev conversion!
>>>>>>>> >> --
>>>>>>>> >> You received this message because you are subscribed to the
>>>>>>>> Google Groups
>>>>>>>> >> "hackerspace_brisbane" group.
>>>>>>>> >> To post to this group, send email to
>>>>>>>> >> hackerspace_brisbane@googlegroups.com.
>>>>>>>> >> To unsubscribe from this group, send email to
>>>>>>>> >> hackerspace_brisbane+unsubscribe@googlegroups.com.
>>>>>>>> >> For more options, visit this group at
>>>>>>>> >> http://groups.google.com/group/hackerspace_brisbane?hl=en.
>>>>>>>> > --
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>>>>>>>> > "hackerspace_brisbane" group.
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>>>>>>>> hackerspace_brisbane@googlegroups.com.
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>>>>>>>> --
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>>>>>>> --
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Okay, cool. Because that was the toss up - going for a 72v 60ah pack or
try and fit as many 40ah cells as I can in ie up to 120v, I'd probably fit
96 volts worth in there. I'm talking about thundersky cells here.
On Wed, Jun 13, 2012 at 10:26 PM, Lemming . <inert...@gmail.com> wrote:
> No, the motor will draw as much amperage it needs at a given voltage.
> I.e. a 2kw motor will draw 100A at 20v, or 20A at 100v
> So long as the controller can handle the voltage, it is always better to
> go for a high voltage, but higher voltage often means trading off for lower
> battery capacity as you need to put more cells in series to obtain the
> requisite voltage.
> On 13 June 2012 22:23, Sam Knight <sam.knigh...@gmail.com> wrote:
>> Yeeeah right okay, so that's why I don't have to change any settings or
>> anything on my controller to run at a different voltage - it's just going
>> to put it's 400 amps in, and the motor will find it's own voltage, right?
>> I'm obviously not an electrical guy, I'm just getting my head around it
>> all at this stage.
>> On Wed, Jun 13, 2012 at 10:10 PM, Jimmy Bowler <denomina...@gmail.com>wrote:
>>> Sam the votage is not a problem the speed controller will sort that out
>>> with the current just like the stepper motor on reprap its the current you
>>> have to worry about.
>>> On Wed, Jun 13, 2012 at 9:20 PM, Sam Knight <sam.knigh...@gmail.com>wrote:
>>>> I think it is easy to find big heavy inefficient motors, but only
>>>> recently people have been bringing out higher efficiency brushless dc
>>>> permanent magnets and AC motors more suited for high speed, high current
>>>> draw applications. My motor is pretty inefficient at high draw, cause it's
>>>> series DC, but it's the best value for money at the moment. I've got a
>>>> performance sheet attached.
>>>> On Wed, Jun 13, 2012 at 9:16 PM, Sam Knight <sam.knigh...@gmail.com>wrote:
>>>>> That's a Curtis 1221C - it's rated at 120V, 400 amps for a short
>>>>> interval, 150 amps continuous. But the motor is only rated to 72 volts.
>>>>> There are a bunch of guys at the aeva meetings who reckon I could run it
>>>>> at a higher voltage, but I dunno, I don't want to burn it out. All the
>>>>> gear can be got at evworks.com, they are based out of perth.
>>>>> On Wed, Jun 13, 2012 at 7:53 PM, James Hodgkinson <yale...@ricetek.net
>>>>> > wrote:
>>>>>> Most people either use zillas or forklift controllers because that's
>>>>>> the power rating you're looking at. There's a big market for high-powered
>>>>>> controllers in the states, with watercooled control units not being out of
>>>>>> the ordinary. Custom ones aren't hard to make if you're looking for
>>>>>> something without traction control... it's basically "dump current here,
>>>>>> have an off switch".
>>>>>> James
>>>>>> On 13 June 2012 19:33, buzz <davidb...@gmail.com> wrote:
>>>>>>> The part that seems the hardest to source to me is the speed
>>>>>>> controller for the big motor...? I assum big electric motors are
>>>>>>> pretty easy to find ( eg in electric golf carts and the like ) , but what
>>>>>>> do people do for ESC/s to drive them? ( assuming we don't want to shell
>>>>>>> out large $$ for a comercial unit, of course)
>>>>>>> Also, what sort of motor and "black box"( speed controller?) is
>>>>>>> that Sam?
>>>>>>> On 13 June 2012 18:43, Sam Knight <sam.knigh...@gmail.com> wrote:
>>>>>>>> Here's some pics by the way, if anyone is interested in my canary
>>>>>>>> yellow beast. I'm just mounting the motor now, and saving for the
>>>>>>>> lithiums! I should be able to get a good 25Kw out of that motor, and fit a
>>>>>>>> good 4 Kw/h pack on the thing, but those racing guys are talking something
>>>>>>>> like 60Kw and 20 Kw/h packs! Crazy.
>>>>>>>> On Wed, Jun 13, 2012 at 6:30 PM, James Churchill <pel...@gmail.com>wrote:
>>>>>>>>> And Rohan in his Joker coat to ride it.
>>>>>>>>> - James
>>>>>>>>> On 13 June 2012 18:06, tjhowse <tjho...@gmail.com> wrote:
>>>>>>>>> > We should turn up with one of those electric scooters and a pile
>>>>>>>>> of 12v SLA
>>>>>>>>> > batteries.
>>>>>>>>> > On 13 June 2012 18:01, Sam Knight <sam.knigh...@gmail.com>
>>>>>>>>> wrote:
>>>>>>>>> >> I don't know if anyone gets excited as I do about electric
>>>>>>>>> motorbikes, but
>>>>>>>>> >> if you do the TTXGP is coming to Brissie! Wooo!!
>>>>>>>>> >> The official site is http://www.egrandprix.com/, but the guys
>>>>>>>>> at
>>>>>>>>> >> evmotorcycle.org have better info and coverage on the oz
>>>>>>>>> contenders. There
>>>>>>>>> >> are only a few teams in Australia, and the main two are the
>>>>>>>>> ripperton and
>>>>>>>>> >> catavolt teams. SO keen to perve on the bikes and watch them
>>>>>>>>> run, albeit
>>>>>>>>> >> for not very long (races are only one lap I think).
>>>>>>>>> >> Should help to enthuse me to get into my ev conversion!
>>>>>>>>> >> --
>>>>>>>>> >> You received this message because you are subscribed to the
>>>>>>>>> Google Groups
>>>>>>>>> >> "hackerspace_brisbane" group.
>>>>>>>>> >> To post to this group, send email to
>>>>>>>>> >> hackerspace_brisbane@googlegroups.com.
>>>>>>>>> >> To unsubscribe from this group, send email to
>>>>>>>>> >> hackerspace_brisbane+unsubscribe@googlegroups.com.
>>>>>>>>> >> For more options, visit this group at
>>>>>>>>> >> http://groups.google.com/group/hackerspace_brisbane?hl=en.
>>>>>>>>> > --
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>>>>>>>>> --
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>>>>>>>> --
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>>>>>>>> For more options, visit this group at
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>>>>>>> --
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>>>>>> --
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>>>> --
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>>> --
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G a carpenter finding it hard to get electrical motor theory around his
head.
P=VI so its the ratio between current and voltage that sets the power
output of the motor. However the higher the voltage the more heat you got
to dissipate from your speed controller
On Wed, Jun 13, 2012 at 10:34 PM, Sam Knight <sam.knigh...@gmail.com> wrote:
> Okay, cool. Because that was the toss up - going for a 72v 60ah pack or
> try and fit as many 40ah cells as I can in ie up to 120v, I'd probably fit
> 96 volts worth in there. I'm talking about thundersky cells here.
> On Wed, Jun 13, 2012 at 10:26 PM, Lemming . <inert...@gmail.com> wrote:
>> No, the motor will draw as much amperage it needs at a given voltage.
>> I.e. a 2kw motor will draw 100A at 20v, or 20A at 100v
>> So long as the controller can handle the voltage, it is always better to
>> go for a high voltage, but higher voltage often means trading off for lower
>> battery capacity as you need to put more cells in series to obtain the
>> requisite voltage.
>> On 13 June 2012 22:23, Sam Knight <sam.knigh...@gmail.com> wrote:
>>> Yeeeah right okay, so that's why I don't have to change any settings or
>>> anything on my controller to run at a different voltage - it's just going
>>> to put it's 400 amps in, and the motor will find it's own voltage, right?
>>> I'm obviously not an electrical guy, I'm just getting my head around it
>>> all at this stage.
>>> On Wed, Jun 13, 2012 at 10:10 PM, Jimmy Bowler <denomina...@gmail.com>wrote:
>>>> Sam the votage is not a problem the speed controller will sort that out
>>>> with the current just like the stepper motor on reprap its the current you
>>>> have to worry about.
>>>> On Wed, Jun 13, 2012 at 9:20 PM, Sam Knight <sam.knigh...@gmail.com>wrote:
>>>>> I think it is easy to find big heavy inefficient motors, but only
>>>>> recently people have been bringing out higher efficiency brushless dc
>>>>> permanent magnets and AC motors more suited for high speed, high current
>>>>> draw applications. My motor is pretty inefficient at high draw, cause it's
>>>>> series DC, but it's the best value for money at the moment. I've got a
>>>>> performance sheet attached.
>>>>> On Wed, Jun 13, 2012 at 9:16 PM, Sam Knight <sam.knigh...@gmail.com>wrote:
>>>>>> That's a Curtis 1221C - it's rated at 120V, 400 amps for a short
>>>>>> interval, 150 amps continuous. But the motor is only rated to 72 volts.
>>>>>> There are a bunch of guys at the aeva meetings who reckon I could run it
>>>>>> at a higher voltage, but I dunno, I don't want to burn it out. All the
>>>>>> gear can be got at evworks.com, they are based out of perth.
>>>>>> On Wed, Jun 13, 2012 at 7:53 PM, James Hodgkinson <
>>>>>> yale...@ricetek.net> wrote:
>>>>>>> Most people either use zillas or forklift controllers because that's
>>>>>>> the power rating you're looking at. There's a big market for high-powered
>>>>>>> controllers in the states, with watercooled control units not being out of
>>>>>>> the ordinary. Custom ones aren't hard to make if you're looking for
>>>>>>> something without traction control... it's basically "dump current here,
>>>>>>> have an off switch".
>>>>>>> James
>>>>>>> On 13 June 2012 19:33, buzz <davidb...@gmail.com> wrote:
>>>>>>>> The part that seems the hardest to source to me is the speed
>>>>>>>> controller for the big motor...? I assum big electric motors are
>>>>>>>> pretty easy to find ( eg in electric golf carts and the like ) , but what
>>>>>>>> do people do for ESC/s to drive them? ( assuming we don't want to shell
>>>>>>>> out large $$ for a comercial unit, of course)
>>>>>>>> Also, what sort of motor and "black box"( speed controller?) is
>>>>>>>> that Sam?
>>>>>>>> On 13 June 2012 18:43, Sam Knight <sam.knigh...@gmail.com> wrote:
>>>>>>>>> Here's some pics by the way, if anyone is interested in my canary
>>>>>>>>> yellow beast. I'm just mounting the motor now, and saving for the
>>>>>>>>> lithiums! I should be able to get a good 25Kw out of that motor, and fit a
>>>>>>>>> good 4 Kw/h pack on the thing, but those racing guys are talking something
>>>>>>>>> like 60Kw and 20 Kw/h packs! Crazy.
>>>>>>>>> On Wed, Jun 13, 2012 at 6:30 PM, James Churchill <pel...@gmail.com
>>>>>>>>> > wrote:
>>>>>>>>>> And Rohan in his Joker coat to ride it.
>>>>>>>>>> - James
>>>>>>>>>> On 13 June 2012 18:06, tjhowse <tjho...@gmail.com> wrote:
>>>>>>>>>> > We should turn up with one of those electric scooters and a
>>>>>>>>>> pile of 12v SLA
>>>>>>>>>> > batteries.
>>>>>>>>>> > On 13 June 2012 18:01, Sam Knight <sam.knigh...@gmail.com>
>>>>>>>>>> wrote:
>>>>>>>>>> >> I don't know if anyone gets excited as I do about electric
>>>>>>>>>> motorbikes, but
>>>>>>>>>> >> if you do the TTXGP is coming to Brissie! Wooo!!
>>>>>>>>>> >> The official site is http://www.egrandprix.com/, but the guys
>>>>>>>>>> at
>>>>>>>>>> >> evmotorcycle.org have better info and coverage on the oz
>>>>>>>>>> contenders. There
>>>>>>>>>> >> are only a few teams in Australia, and the main two are the
>>>>>>>>>> ripperton and
>>>>>>>>>> >> catavolt teams. SO keen to perve on the bikes and watch them
>>>>>>>>>> run, albeit
>>>>>>>>>> >> for not very long (races are only one lap I think).
>>>>>>>>>> >> Should help to enthuse me to get into my ev conversion!
>>>>>>>>>> >> --
>>>>>>>>>> >> You received this message because you are subscribed to the
>>>>>>>>>> Google Groups
>>>>>>>>>> >> "hackerspace_brisbane" group.
>>>>>>>>>> >> To post to this group, send email to
>>>>>>>>>> >> hackerspace_brisbane@googlegroups.com.
>>>>>>>>>> >> To unsubscribe from this group, send email to
>>>>>>>>>> >> hackerspace_brisbane+unsubscribe@googlegroups.com.
>>>>>>>>>> >> For more options, visit this group at
>>>>>>>>>> >> http://groups.google.com/group/hackerspace_brisbane?hl=en.
>>>>>>>>>> > --
>>>>>>>>>> > You received this message because you are subscribed to the
>>>>>>>>>> Google Groups
>>>>>>>>>> > "hackerspace_brisbane" group.
>>>>>>>>>> > To post to this group, send email to
>>>>>>>>>> hackerspace_brisbane@googlegroups.com.
>>>>>>>>>> > To unsubscribe from this group, send email to
>>>>>>>>>> > hackerspace_brisbane+unsubscribe@googlegroups.com.
>>>>>>>>>> > For more options, visit this group at
>>>>>>>>>> > http://groups.google.com/group/hackerspace_brisbane?hl=en.
>>>>>>>>>> --
>>>>>>>>>> You received this message because you are subscribed to the
>>>>>>>>>> Google Groups "hackerspace_brisbane" group.
>>>>>>>>>> To post to this group, send email to
>>>>>>>>>> hackerspace_brisbane@googlegroups.com.
>>>>>>>>>> To unsubscribe from this group, send email to
>>>>>>>>>> hackerspace_brisbane+unsubscribe@googlegroups.com.
>>>>>>>>>> For more options, visit this group at
>>>>>>>>>> http://groups.google.com/group/hackerspace_brisbane?hl=en.
>>>>>>>>> --
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>>>>>>>>> Groups "hackerspace_brisbane" group.
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>>>>>>>> --
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>>>>>>> --
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>>>>> --
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Yeah you could use a bunch of mosfets if you want but remember that it is a
really bad idea as you will get a mismatch between the transistors and if
you start to blow a couple of them you may have a catastrophic failure. if
you get a dead short what happens when you are going flat out around the
corner and your back wheel locks up from a dynamic breaking effect of your
speed controller fault.
It reminds me of when I was rewiring a bowls club I was trying to figure
out what circuit was what, I flicked one breaker off that the Gardner had
plugged into his ride on roller he was using (
http://www.youtube.com/watch?v=1t9DNP0Wo-0 only electric with trailing
lead) Normally when he looses power
it just glides to a stop. However this time I flicked the breaker back on
and it flicked him off the thing at full speed because the motor kicked
back in when he wasn't ready.
On Thu, Jun 14, 2012 at 6:59 AM, David Lyon <david.lyon.preissh...@gmail.com
> A good place to go looking for a 'juicy' heatsink is
> broken welder. The heatsinks in those are pretty chunky.
> --
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On Thu, Jun 14, 2012 at 10:02 AM, Jimmy Bowler <denomina...@gmail.com>wrote:
> Yeah you could use a bunch of mosfets if you want but remember that it is
> a really bad idea as you will get a mismatch between the transistors and if
> you start to blow a couple of them you may have a catastrophic failure. if
> you get a dead short what happens when you are going flat out around the
> corner and your back wheel locks up from a dynamic breaking effect of your
> speed controller fault.
this is why we run the numbers and make sure the mosfets can handle 4x the
stall torque at 80c ambient ;)
unlike BJTs (and probably IGBTs too), mosfets will share power fairly
happily.. their Rds(on) increases with temperature, so if one heats up, it
shifts some of its share of the load to its colder buddies.
by this same effect they can go into thermal runaway, but to avoid that we
simply make sure that if the silicon is at 175c, with worst case load
they'll cool down.. then they'll never approach 175c except during faults
always have a kill switch of course, and some huge fuses!
