our project use speed loop and current loop, current loop use FOC.
there is a problem, when speed loop goal is set to zero, current loop iq goal value is zero, the motor stop, but there are some noise comes from the motor. Under this condition, I see the current loop iq feedback is still changing, so the current loop PI regulator still output small UQ value to SVPWM, the 3 three phase inverter still works, maybe this is the soure of the noise.
so is there some method to solve the noise problem when speed goal is set to zero? thanks a lot
