integral separation PID control algorithm based on in speed loop, The direction of rotation depends on the polarity of its output, so it is assured that the motor can run in all four quadrants. Position-loop uses PI regulator. The scheme of full bridge PWM modulation is adapted in inverter.
A. Design of hardware
In this paper, PWM control scheme shown as Fig.2 is used in this design for three-phase Y-type permanent magnet square wave brushless DC motor. It uses all-digital three- closed-loop control, with PI regulator in current-loop and the