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Title: Design and optimization of a new magnetic-geared pole-changing hybrid excitation machine
Authors: Zhao, X 
Niu, SX 
Issue Date: Dec-2017
Source: IEEE transactions on industrial electronics, Dec. 2017, v. 64, no. 12, p. 9943-9952
Abstract: This paper presents a new magnetic-gear pole-changing hybrid excitation machine (MG-PCHEM), which can provide high torque density and improved flux-weakening ability. The key is to flexibly change the pole-pair number of inner excitation sources by injecting variable dc field currents, and, hence, regulate the dominant pole-pair flux components to realize an effective magnetic field adjustment. In the following paper, the machine configuration and its operation principle of flux control are introduced first. Then, the influences of some leading design parameters are analyzed including the slot-pole combination and other dimension parameters, and after which a comparative study is carried out with traditional single-stator topology. Based on the optimal design, electromagnetic performance of the MG-PCHEM is further evaluated by using the finite-element method. Finally, a prototype is designed, manufactured, and fully tested. Relevant experimental results verify the feasibility of this new hybrid solution as well as the finite-element predictions.
Keywords: Hybrid excitation machine (HEM)
Magnetic field adjustment
Magnetic geared
Pole changing
Publisher: Institute of Electrical and Electronics Engineers
Journal: IEEE transactions on industrial electronics 
ISSN: 0278-0046
EISSN: 1557-9948
DOI: 10.1109/TIE.2017.2716879
Rights: ©2017 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
The following publication X. Zhao and S. Niu, "Design and Optimization of a New Magnetic-Geared Pole-Changing Hybrid Excitation Machine," in IEEE Transactions on Industrial Electronics, vol. 64, no. 12, pp. 9943-9952, Dec. 2017 is available at
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