Loss characterization of flux-switched permanent magnet linear motor based on multi-physics field coupling analysis

Motor loss will reduce the working efficiency and affect the service life of the motor. Therefore, reducing motor losses and improving the working efficiency of motors have been the focus and hotspot of research in the motor industry. In this paper, for the special structure of LFSPM (Linear Flux Switching Permanent Magnet Motor) motor, based on the multi-physical field coupling analysis, the calculation of permanent magnet eddy current loss is studied and discussed. Then the effects of the rotational frequency on the loss at different operating speeds are compared by simulation. The difference between the two in terms of motor losses is analyzed. The experimental results show that the permanent magnet eddy current loss under the rated load and secondary motion speed reaches stability after 25ms; the total iron consumption of the motor basically remains unchanged when the overload multiplier is one to three times. In terms of current loss, after stabilization, the secondary loss is 2.5kW at constant differential frequency, and the secondary current loss is 2.2kW under vector control, which indicates that constant differential frequency also has an advantage in terms of secondary loss, and it is suitable for occasions with high requirements on normal force.