I've got a motor controller for a Bldc and I'm in the process of tuning the controller with both PWM frequency, duty cycle and commutation frequency.

Anyway, this power supply is a 30v 10A supply and when I drive the motor, the voltage and current limits kick in. I start at 12V and allow 10A, but the supply sags to 9.5V @ 3.5A. Then, when I shut the motor inverter off, and disconnect the supply, the power supply voltage indicator climbs up to 50V! I have to short out the terminals to get it back under control.

So, two questions :

Why doesn't my supply current limit at 10A like its supposed to? If I short the terminals, I can get 10A, but the motor won't pull 10A.

And, why does the voltage climb after being disconnected?