Development of a four-axis actively controlled consequent-pole-type bearingless motor

Publication Type:
Journal Article
IEEE Transactions on Industry Applications, 2009, 45 (4), pp. 1378 - 1386
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In this paper, a design-optimization method for a consequent-pole bearingless motor with a rather large air-gap length is presented. A rotor iron and permanent-magnet structure is proposed which enhances the suspension-force capability during startup. Magnetic saturation in the rotor-iron pole area is solved, and the stator iron is designed so that magnetic saturation is avoided. The design optimization is based on finite-element-method analysis. It is shown that startup is achieved from the touch-down condition in the experiments. © 2009 IEEE.
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