Coreless Dual-rotor Disc Hysteresis Motor, Modeling, and Performance Prediction

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Due to their robust structure, low and constant starting current, constant torque, and smooth and noiseless operation, small- and medium-sized power rating hysteresis motors are commonly employed in high-speed applications. However, hysteresis motors, in general, have a comparatively low power factor, efficiency, and torque density. In this article, a new structure, the coreless dual-rotor disc hysteresis motor, is introduced. Electromagnetic field analysis of the machine is performed, and its steady-state equivalent circuit is deduced. An algorithm employed in a computer simulation predicts the operating characteristics of the new machine. In comparison with common hysteresis machines, the superiority of the coreless dual-rotor disc hysteresis motor in regards to efficiency and power factor is revealed. Moreover, a sensitivity analysis is accomplished, and impacts of some structural parameters on the performance of the machine are illustrated. Simulation and a few experimental results for a prototype machine are given, and these validate the equivalent circuit and proposed model of the coreless dual-rotor disc hysteresis motor.

Keywords: coreless; dual-rotor discs; equivalent circuit; hysteresis motor; modeling

Document Type: Research Article


Affiliations: Faculty of Electrical and Robotics Engineering, Shahrood University of Technology, Iran

Publication date: March 1, 2010

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