A Novel Consequent-Pole Bearingless Permanent-Magnet Motor With Active Axial Suspension

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Abstract
This article proposes a novel consequent-pole bearingless permanent magnet (PM) motor (CP-BPMM) with reduced PM usage, featuring additional air gaps, large axial force generation, and natural decoupling among torque, radial force, and axial force. Through the regulation of the current in axial force coil, the axial air-gap flux is adjusted to produce active axial force. With this design, the proposed CP-BPMM reduces bias PM volume while boosting active axial force and torque. The topology and operation principle of CP-BPMM are introduced first, and the radial and axial force equations are deduced. Based on the 3D finite element method, the decoupled characteristics are verified, and the influence of additional air gaps and bias PM dimensions on axial force is analyzed. To demonstrate the merits of the proposed CP-BPMM, comparative performance analyses of the electromagnetic and suspension performance are performed between two CP-BPMM designs, validating the superiority of the proposed motor.
Funding Information
  • National Nature Science Foundation of China (52177049)

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