Radial position control of a PM synchronous type and induction type rotating motor

Abstract

In this paper, a general solution of radial position control applicable to PM synchronous type and induction type rotating motor is presented. The rotor of the permanent magnet motor is assumed to have the sinusoidally distributed magnetic poles along the axial surface, while the rotor of the induction type motor is assumed to have the uniform magnetic property. The inner wall of the stator is also assumed to have a current sheet, which can produce an arbitrary current distribution. The same number of magnetic pole gives the rotating torque to the rotor, while the plus minus two pole of the motoring control produces a pure drag force to the rotor. By controlling the magnitude and phase of the plus minus two pole current distribution relative to the motoring magnetic pole, the drag force can be controlled in the radial coordinate. This general solution is experimentally confirmed by using a simple experimental setup.

Optimum Pole Number Combination of a Buried Permanent Magnet Bearingless Motor and Test Results at an Output of 60 kW With a Speed of 37000 r/min

“…Different pole pair combinations of a concentrated winding SPM bearingless motor have also been analyzed [24]. Motor vibrations with different pole number combinations for SPM bearingless motor have been compared [25].…”