I took this video to ask for help from the EV boards, and others who may know. I am using a Kelly KD series SepEx motor controller. The battery back is 6-12v batteries (lead acid), so a 72v nominal system. The problem is it has no power. The wheels did run fwd and rev but no power to move the kart. Up on blocks the wheel spin like crazy and seem like theres no stopping them. When I get excited and put the kart down theres nothing there. In fact I can hold the wheel in place with a bear hug while my wife presses the accelerator. Whats the issue. Is the controller really that bad? Would a better controller totally fix this problem?
I was considering investing in a better contoller but the last thing I want to do is spend the money and have the same results. I am not totally ignorant about motora and electronics but I am not an expert either. Is my motor ok, can an improper field setting take an otherwise large motor and make it crap? Any imput is appreciated. I am really tryin gto learn an put my finger on the problem. I dont believe its my motor, and I am pretty sure I have enough avail power. The weakest point I think is that damm kelly controller.
I have more stories about the kelly contoller but Ill save that for another time.
Answer a few questions please.
1) Looks like those are 6 volt batteries. Please confirm. You say a 72V system. Let's see a voltmeter reading on the battery set.
2) Motor nameplate is 36 volt. Why are you using a 36V motor with a 72V system.
3) You say it is a SepEx. How do you know the motor is a SepEx wound motor?
4) What is the specification of the controller?
5) I cannot see due to the chain guard, but it appears to be an overdrive. All carts, bikes and other such EVs have a much larger sprocket on the wheel than on the motor shaft. To the tune of 4 to 1. If you in fact have a larger sprocket on the motor than the wheel, it would explain the very low wheel torque. Remove the chain guard and let's see what you have.
6) How were the parameters set for the controller to match the motor characteristics?
7) Please show a complete wiring diagram.
Even with the heavy cart, that size motor is capable of moving it around pretty well, with the proper drive ratio.
I can't tell you if that controller is toasted or not. But might be able to see some other issues with more info.