Can a 24V alternator be converted to 12V, amperage increase??
ph...@hotmail.com
amperage stay the same or double due to the voltage drop? Any information
will be greatly appreciated.
Thanks,
Paul
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shekwm
ph...@hotmail.com wrote in message <6s6gb7$g1i$1...@nnrp1.dejanews.com>...
John M. Hansen
winding size is a limiting factor. It would be highly unlikely that you
could double the current.
John M Hansen
Trapper
>I am looking for information on converting a 24V alternator to 12V. Will the
>amperage stay the same or double due to the voltage drop? Any information
>will be greatly appreciated.
>
>Thanks,
>Paul
All you have to do is change the voltage regulator.
Load capacity remains at the same level.
Amps are determined by the load not the alternator.
Trapper
PAForbes
presumably the poster has a truck machine that he wants to use for lighting or
similar usage.
The 24V alternator will have stator windings wound with a grade of wire
suitable for the output rating at 24V, and the AC output before rectification
will be too high for the controller to cope with at 12V.
You do not have phase control in a small auto alternator, so you can only
control the field current, and at 12V this will be very low indeed, thus the
available power will be limited by wire size and the regulator.
Putting a 12V controller on will not help much, unless you can limit the
overall output current to prevent damage to the stator windings.
Cheaper and better to change the alternator.
Kind regards, Peter (Rushden, UK)
Peter Forbes Home Fax: +44 (0)1933 355557 Work Fax +44 (0)1582 416000
Trapper
>The 24V alternator will have stator windings wound with a grade of wire
>suitable for the output rating at 24V, and the AC output before rectification
>will be too high for the controller to cope with at 12V.
>
The grade of wire remains the same however the 24 volts machine will
have more turns on the stator to maintain volts/turn for insulation
purposes of the magnet wire. Whereas running an alternator at a
higher voltage than design could lead to turn turn failure of the
stator running at a lower voltage is OK. The guage of the stator
winding magnet wire determines it's current carrying capability.
>You do not have phase control in a small auto alternator, so you can only
>control the field current, and at 12V this will be very low indeed, thus the
>available power will be limited by wire size and the regulator.
One could put a governor on the motor if frequency control was
required. A ramped control AVR could be employed. However it is
assumed that original poster is working on an automotive type
alternator with integral AVR and probably output rectification to
24VDC. In this type of alternator the AVR is normally a Darlington
pair transistor that switches the rotor magnetising on/off as it
crosses some preset voltage (14.5 or so for cars).
>
>Putting a 12V controller on will not help much, unless you can limit the
>overall output current to prevent damage to the stator windings.
This is true regardles of the voltage.
>
>Cheaper and better to change the alternator.
Depends. 12v AVR's are available for $10 or so even cheaper at auto
junl yards. And then I wouldn't pay more than $15 for a working 12V
alternator, so it's probably more economic to use a 12V alternator.
>
>Kind regards, Peter (Rushden, UK)
>Peter Forbes Home Fax: +44 (0)1933 355557 Work Fax +44 (0)1582 416000
Trapper in Calgary, Alberta
rath...@netcom.ca
Fred
pafo...@aol.com says...
>
> Re the original request for information on converting a 24V alternator to 12V,
> presumably the poster has a truck machine that he wants to use for lighting or
> similar usage.
>
The engine RPM is 2800
The alternator will be turning @ 4:1 Ratio to RPM
> The 24V alternator will have stator windings wound with a grade of wire
> suitable for the output rating at 24V, and the AC output before rectification
> will be too high for the controller to cope with at 12V.
>
> You do not have phase control in a small auto alternator, so you can only
> control the field current, and at 12V this will be very low indeed, thus the
> available power will be limited by wire size and the regulator.
>
> Putting a 12V controller on will not help much, unless you can
"""limit the overall output current""" to prevent damage to the stator
windings.
How can this be accomplished?
>
> Cheaper and better to change the alternator.
Not available
>
> Kind regards, Peter (Rushden, UK)
>
>
Thank you all very much for your input!
Sincerely,
Paul
PAForbes
Could you give us a bit more info on what you have exactly, ie engine type,
alternator (existing) etc ?
Regards, Peter