A Novel Hybrid Hysteresis Motor With Combined Radial and Axial Flux Rotors

This paper introduces the design and analysis of a new hybrid hysteresis motor with combined axial and radial flux rotors aiming to improve the poor performance characteristics of the conventional hysteresis motors such as the output torque and efficiency. The proposed hybrid design incorporates the advantageous features of both the conventional axial and radial flux hysteresis motors (RFHMs) in a unique structure. The design aspects and constraints of the proposed machine are based on a prestudied single-sided axial flux hysteresis motor (AFHM). In order to analyze the electromagnetic performance of the proposed structure and investigate the geometry specifications of the designed machine, a three-dimensional (3-D) finite-element analysis (FEA) is conducted. The hysteresis loop modeling is done based on the elliptical approximation of the hysteresis loop by considering the saturation during the FEA with an iterative method. Finally, in order to investigate the electromagnetic performance of the proposed device and the accuracy of the design and analysis approach, a prototype is built. The test results validate the good performance of the proposed machine.