Non-Contact Rotation Test of Lorentz-Force-Type Self-Bearing Motor with Rotational Speed Feedback

概要

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Magnetic bearing motors have the advantages of no friction loss, no lubrication, and so on. However, these motors are not used widely because of their high cost and large size. To overcome these limitations, a self-bearing motor having a simple structure with distributed windings has been proposed. The rotor consists of a permanent magnet and an iron yoke that rotates within the 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 the interaction between the stator current and the magnetic field of the permanent magnet, controls the rotational speed and radial position of the rotor. In this paper, a closed-loop torque controller with rotational speed feedback is introduced, and the performance of the controller is verified experimentally. The rotor was able to avhieve speeds of up to 10,000 rpm, which is approximately twice the rotational speed achieved in a previous study. Moreover the dynamic torque and motor efficiency are determined, and the characteristics of the proposed motor are discussed.