Pota wrote:The seller of the motor says:
11 tooth sprocket, it is haw effect and will only work with the correct voltage/wattage, controller.
Is that correct. Or does he say that not to overvolt it?
I've run all my BOMAs at 82 volts. Ignore that nonsense. If you had a 150 volt controller and battery pack, you could run the BOMA at 150 volts. This is not a concern that you will likely exceed. The winding insulation dielectric is something like 2000 volts. I'm much more concerned about you exceeding the current handling ability of the motor, making it get too hot and burning it out.
You will want to remove the screens over the holes in the end caps. They get clogged up and the motor gets no air. They are useless anyway. I still have a 1500 watt BOMA that runs. It ran at 82 volts with no issues hauling a 120 pound scooter with my 240 pounds on top of that at 40mph. You need to set the phase current down low enough to NOT burn out the motor. At 1500 watts and 82 volts, that's about 20 amps, but you can go a little higher. Maxing the phase amps won't give you more power at the motor...just a very hot motor. Set the phase amps only as high as you can feel it making more torque in the motor and then back off 5-10%. I don't know what gearing or wheel size you are using, but gearing that is too close to 1:1 will cause the motor to suck down current and to get hot quickly. You want the motor to spin easily enough that it's not always fighting to rotate. This is a fact of all motors. They have limited ability to deliver torque so you have to use them inside their limits.
Enjoy over watting your motor! It will take some abuse and keep going as long as you don't let it get too hot. I added a blower to force air into mine so that I could run it harder. That worked great until the stupid screens clogged up. Anyway, at the can, 160F is a good maximum limit, but inside the windings that's more like 230F or hotter...so things are close to frying. I typically stayed at 140F at the can. Stay around 140F and you will be OK. If the motor windings use good quality insulation and lets face it, this is a cheap BOMA so that's highly doubtful, then the wire insulation is going to fail at 200C/392F. Since this is a cheap BOMA, expect the wire insulation to fail at a much lower temperature...say 130C/260F. Keep it cool and it will run a lot longer, but run it hot and push too much current through it and it will die quickly.