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Memory machines (MMs) equipped with low coercive force (LCF) permanent magnet (PM), e.g. AlNiCo and high coercive force (HCF) PM, e.g. NdFeB, possess the advantages of high power density, high efficiency and high efficient flux-regulation capability. In this paper, a robust control strategy to achieve the maximum torque output in different speed region is proposed and implemented on a hybrid permanent...
Three flux-regulation methods, namely stored capacitor discharge pulse (SCDP), constant current source pulse (CCSP) and quantitative flux-regulation pulse (QFRP), used for stator permanent magnet (PM) memory machine (MM), are comparatively studied in this paper. On the basis of analyzing the circuit topologies and flux-regulation principle of these flux-regulation methods, both simulation and experiment...
This paper presents the theoretical analysis of flux-weakening performance of series permanent magnet (SPM) memory machine. A modified circle diagram is proposed to graphically illustrate the maximum torque per voltage (MTPV) flux-weakening control strategy for the memory machine. It is shown that a maximum torque capacity can be obtained by controlling the armature current and magnet flux simultaneously...
This paper presents a novel axial field flux-switching memory machine (AFFSMM) with series hybrid permanent magnet (PM) for extending the flux-weakening performance while maintaining high torque density. The key is the introduction of series hybrid PM with low-coercive force (LCF) PM which enables direct control of magnet flux. Operating principle of series PM is presented. The effects of the proportion...
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