Flux filter LSPM motor for the prevention of demagnetizing in permanent magnet

In this paper, we proposed the flux filter LSPM motor in order to reduce the demagnetizing flux in the rotor magnet at starting condition. Line start permanent magnet motors have high efficiency and simple driving circuit. LSPM motor is needed the conductor bar in the rotor instead of power electric operating system for rotating. LSPM rotor is complex than general synchronous motor because of its conductor bar. But, LSPM motor is big problem to use in the industrial motor. The starting current is too large, it is occur the demagnetizing of permanent magnet. Proposed flux filter decrease the opposite flux against magnetizing direction. In order to analyze the effect of magnetizing, time-stepping finite element analysis is used. We verify the performance of the flux filter LSPM with ferrite magnet and compared with neodymium magnet LSPM.