Hello
I fitted a non genuine 24dc motor controller to my mobility scooter. After fitting the controller ,when the motor had little to no load on it (ie moving on flat ground or going down hill)the controller would cut power to the motor and you have to reset the controller into forward or reverse to get it going again. When the motor is loaded up (ie going up hill) it works perfectly. Can someone please tell me what is going on. The motor is a brush type motor. Seems like the controller is getting some sort of feedback from the motor when it is in overrun. I hope someone has come across this before Cheers

 

That seems like an overload sensor is either wired backward or terribly mis-calibrated

 

That seems like an overload sensor is either wired backward or terribly mis-calibrated

Thanks for that. I wasn’t sure if the controller may not have been compatible with a brushed motor as opposed to a brushless motor. When I bought it wasn’t specified. I couldn’t get any sense out of the sealer after I bought it. What do you think. Cheers

 

Given the statement of the symptoms and the lack of any useful information, it is difficult to be more specific.

 

Can you post information about the controller?, like datasheet or circuit diagram or anything we can see and though help better?

 

when the motor had little to no load on it (ie moving on flat ground or going down hill)the controller would cut power to the motor

The controller should reduce or cut power, but clearly ought to restore it without the user having to do a reset. Perhaps it isn't designed to cope with the reverse polarity voltage generated by the free-wheeling motor acting as a generator.

 

Going down hill the motor was probably over-driving the controller, so that it was running faster than the commended speed. Possibly a series diode would prevent that, but then reverse will not work.

 

Thanks for that. I wasn’t sure if the controller may not have been compatible with a brushed motor as opposed to a brushless motor. When I bought it wasn’t specified. I couldn’t get any sense out of the sealer after I bought it. What do you think. Cheers

The brushed motor only has two power leads, as opposed to brushless which has 3 power conductors.

 

If the controller includes an overspeed shutdown then that may also be the problem. I am guessing that the user is not applying any braking going down hills, resulting in the scooter going faster than normal.