TNC Scooter controllers?

[jay]

Working on my first build and looking for something cheap and easy (insert joke here).

Has anyone tried YK43B from TNC Scooters?

Is that what is meant when people refer to "Chinese controllers"?

 

Jay

[Jeremy Bloyd-Peshkin]

Those are fairly standard DC motor controllers. They work for what
they're intended to do. Just make sure that the motor is matched to
the controller or smoke will ensue.

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Jeremy Bloyd-Peshkin

http://tinyworkshop.org

[Tom Gralewicz]

That's the one we are running on Red Lotus with a MY1020(b) motor.

We added a power diode (100A) between the motor negative lead and the positive from the batteries and a 5000uf capacitor across the power rails as close to the controller as possible.

My suspicion is that voltage spikes from the motor tend to blow these controllers by over volting the MOSFETs.  The diode is there to clamp the voltage to no more than the positive battery voltage and the capacitor slows sudden changes in the power rails to help clamp the spikes and reduce instantaneous brown outs.

It has worked for 3 seasons without the magic smoke coming out.

Tom

Tom Gralewicz

Chronic Maker

(414) 380-1716

milwaukeemakerspace.org

[Mark Stolzoff]

I Bought that controller last month and hooked it up to a currie 24 volt 750 watt motor. I was running 48 volt 24 AH Lithium batteries. I Shoulda been more concerned when the controller popped my fuses, but they were 30 or 40 amp ones. I Bypassed them and took off, about 2 miles into the ride one of my 3 Lithium batteries BMS burned up. I Bypassed my main battery pack and figured I'd limp home on my 12AH Lithium pack (that didn't have a BMS) The frickin motor burned up on a slight hill right before I made it back. This is kind of crazy because I've ran motors hard, for a while that were rated way lower and they took a while to burn up. I Ran a 200 watt motor at 48V 1200+ Watts for weeks and over 50 miles before it burned up, and this controller just instantly toasted my nice 750W motor on a small hill. I bought it on ebay, looking over the TNC Scooter specs on it, it says it does 30-100 amps. I'm guessing it was pulling over 75 to toast my BMS's, thats north of 3500 watts, So all the watts listed on that spec sheet (and the one I saw) are total BS. I'm holding onto the controller, I Might use it again after I Get a Cycle Analyst , because those things can limit current. Lemme know if you use it at all and how it goes, thanks

[Tom Gralewicz]

Without current limiting, a motor will pull as many amps as it needs to turn at the speed you are telling it to.

Just because a motor is rated at 750W doesn't mean it can't draw 3500W, it just means it wasn't designed to and will burn up under that sort of load.

Perhaps this is why the smell of burning motors is so well known among the power wheels crowd :-)

Tom Gralewicz

Chronic Maker

(414) 380-1716

milwaukeemakerspace.org

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[Mark Stolzoff]

yea I know, my beef isn't with the motor, It's with the Controller