Abstract
Magnetic bearing motors have advantages such as no friction loss, no abrasion, and lubrication-free operation. However, they are not widely used due to their high cost and large size. In order to solve these problems, a self-bearing motor having a simple structure with distributed windings is proposed. The rotor consists of a permanent magnet and an iron yoke, which rotates in a body. The stator consists of a six-phase distributed winding and is installed between the permanent magnet and the back yoke of the rotor. A Lorentz force, generated by interaction between stator current and permanent magnet field, is used to control the rotation speed and radial position of the rotor. In this study, the rotating torque and bearing force are analyzed theoretically, and methods for their control are discussed. A simple experiment confirms that the proposed self-bearing motor can be realized.
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