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In recent years, increasing rotational speed is required for reducing size and cost of systems applying high-output motors. However, it is difficult for mechanical bearings to suspend a shaft of the high-output motor rotating at high speed due to friction and wear caused by mechanical contact. On the other hand, magnetic bearings (MBs) are useful for shaft suspension of the high-output motor rotating...
A bearingless permanent magnet (PM) motor combines functions of non-contact magnetic suspension and torque generation together, thus it can drive without mechanical contact. Unlike conventional bearingless PM motors, such as a surface-mounted PM motor, a consequent-pole type of bearingless PM motor has inherent advantages. It can regulate the radial rotor positions independently of the motor drive...
Bearingless motors (BelMs) have two kinds of stator windings composed of motor windings and suspension windings in the same stator. Not only torque but also electromagnetic suspension force can be simultaneously generated in the same stator. Therefore, rotor shaft suspension can be realized without mechanical contacts and lubricant. In addition to advantages of magnetic bearings, the BelMs are expected...
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