Wisper Hello

[Andrei]

hello, I would like to put an external controller on a yamaha 36v 250w motor and I don't know how to do it
can someone help me with a diagram

 

[saneagle]

The three thick wires Y, W and L are the phase wires. The hall wires are on the cable marked motor encoder. I would guess that the 3 halls will be the ones marled Y, W and L to match the phase wires and the other two. R and B, are ground and 5v. You can test the ground with a meter, but if they're red and black the same as the battery wires, red is 5v and black is ground.

You don't need and won't be able to use any of the other stuff, so you'll need a throttle and/or a PAS, which you'll have to find a way to bodge onto the crank. You should be able to make it work by glueing the magnets to the chainwheel and the sensor to the motor. You'll need to get the matching LCD for the controller and fit a wheel magnet and sensor for the speed, or you can use your current one if you can figure out which of the three wires is 5v and which is ground. you should be able to figure that out with continuity tests to ground and the 5v in the hall group.

It should be straight forward, but you need to know the speed of the motor. Even though Bosch is a 36v system, the motor actually runs at 24v, so if you ran it with an external controller, it would go to fast. You'd need to use a 24v battery and controller to run it independently. It would probably be a good idea to get a 24v/36v dual voltage controller, just in case the Yamaha is the same, and if it goes too slow, use a cheap buck converter to step down your battery voltage.

Lastly, you need a comms device to trick the battery into switching on because it won't do so until the controller gives the OK. or or buy a new Chinese battery, or fit a new BMS to your Yamaha one.