The 3-phase Hybrid Stepper Motor works very similarly to an AC permanent magnet synchronous servo motor. The permanent magnets used in the rotor are also rare-earth permanent magnets with high magnetic density, so the induced current in the rotor has a negligible effect on the rotor field. In terms of structure, it is equivalent to a multi-pole logarithmic AC permanent magnet synchronous motor. Since the input is a three-phase sinusoidal current, the resulting spatial magnetic field has a circular distribution and the torque characteristics of the 3-phase Hybrid Stepper Motor can be analyzed using the structural model of a permanent magnet synchronous motor.