The Study of Switched Reluctance Motor for 4-DOF Bearingless Motor
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High integration, low loss and high-reliability are the main development trends of flywheel battery. Thus this study presents the first prototype of a novel high-integration four degrees of freedom (4-DOF) bearingless motor with the advantages of weak coupling and low power consumption. The proposed bearingless motor can realize energy conversion and produce 4-DOF radial forces compared with the conventional bearingless motor for improving the integration of system. A biased flux for producing radial levitation forces is provided by the permanent magnets, which reduce the power consumption of the system. Moreover, a decoupling between the torque and the suspension systems is realized through a structural design, thereby improving the controllability. Structure and winding configurations are introduced and the operation principle of the 4-DOF bearingless motor is discussed. Magnetic circuits analysis and parameter design method are present and a three-dimensional finite element model is established. Electromagnetic characteristics that focus on the high integration, low loss and high reliability are discussed and validated comprehensively. Finally, a favorable controllability of radial suspension forces are verified using finite-element analysis and some experimental results.
KeywordsFlywheel battery Bearingless motor Degrees of freedom Radial force
This work was supported by the National Natural Science Foundation of China (51707082, 51877101, 51475452), Natural Science Foundation of Jiangsu Province (BK20170546, BK20150510), China Postdoctoral Science Foundation (2017M620192) and the Priority Academic Program Development of Jiangsu Higher Education Institutions.
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