Two controllers, one battery

[amberwolf]

I see what your saying. With both in series if power is switched off by one, then the other gets no current. I thought only the motor was PWM switched according to rotor position based on the hall sensors. There will also be some phase shifting of the signal due to the combined effects of the other controller that could induce some unexpected results in the system as a whole.

The motor (via the phase fets) is the load that all the current passes thru from + to - of the battery terminals on teh controller.

Otherwise the current would jsut be passing thru the controller even when it was doing nothing, and creating gobs of heat doing no work and wasting all your battery capacity.

So the only time current passes thru the controller to another in series with it at the battery terminals is when the controller is sending a pulse of current thru the phase fets thru the motor.

(other than the tiny few dozen mA always flowing thru the LVPS of the controller).