Buried permanent magnet bearingless motors
Masahide Oshima
Recently, buried permanent magnet (BPM) motors, often referred to as interior permanent magnet (IPM) motors, have become more commonplace. By employing a field-weakening control, adjustable speed operation can be realized over a wide speed range. In addition, a reluctance torque is generated which increases the motor efficiency. In this chapter, the BPM bearingless motor is introduced. The linear position control strategy employed in cylindrical and inset permanent magnet types of motor is not applicable because partial magnetic saturation occurs in the BPM motor so that the suspension force parameters λ′m, M′q and M′d are influenced by the operating currents. Therefore a successful ...
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