The high-density axially-laminated anisotropic (ALA) rotor with axial laminations interleaved with insulation spacer is capable of yielding a comparatively higher saliency ratio. The machine employs the stator of an induction motor. In the course of the startup experiments, once the frequency of the VVVF inverter was beyond a critical value, the inverter-fed prototype presented oscillation and asynchronous operation [1]. Permanent magnet synchronous motor (PMSM) has high power density, high power factor and high efficiency. The better operating performance can be obtained by hybrid ALA rotor and PMSM rotor [2, 3]. The two-pole combined rotor motor was designed in [4], and experiment results showed that the performance with the open-loop variable frequency operating was improved. The hybrid rotor motor has advantages of above two motors, whose rotors do not have damping winding. Instability can still occur with the open-loop V/f control. The influence on the stability of the reluctance machine due to the change in machine parameters was researched by using small signal displacements in [5, 6]. The influence on step response of stepping machine due to the changes of viscous damping torque coefficient and inertia of damper was researched by scholars [7]. So far, it is reported that the hybrid rotor motor is still relatively rare in the literatures.
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