Comparative study of flux-regulation method for stator permanent magnet memory machine

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 are carried out on a hybrid permanent magnet axial field flux-switched memory machine (HPM-AFFSMM) to quantitatively compare the static and dynamic flux-regulation performance of the machine. Under the same conditions for magnetization or demagnetization process, the results confirm that the QFRP enables stator-PM MM to obtain better flux-regulation effect than the other two methods, and it is especially suitable for online PM flux control of stator-PM MM.