Permanent Magnet Stepper Motor Control
The permanent magnet stepper motor has traditionally been used for open loop discrete position control. Internal torque mulitplication allows it to be used in applications needing high torque source. Continuous movement of the stepper motor can be achieved by designing a commutation strategy that distributes the control responsibility between the two phases depending on the position of the rotor.
The motor has a very high torque/inertia ratio. The absence of brushes is an added advantage.
The following position controllers were successfully implemented on a two-phase permanent magnet stepper motor:
The following velocity controller was successfully implemented on a two-phase permanent magnet stepper motor: