Study on Magnetic Field Regulation of a Flux-Variable Partitioned Stator Permanent Magnet Claw Pole Motor

In order to extend the speed of permanent magnet motor (PM) by flux weakening, this paper proposes a flux-variable partitioned stator permanent magnet claw pole motor (FVPSCPM) using AlNiCo memory permanent magnet, whose magnetization level can be changed by current pulse, and NdFeB permanent magnet in series. The structure of the FVPSCPM is introduced firstly, and the principle of regulation of magnetic field is explained with the demagnetization characteristics of AlNiCo. Different combination schemes of thickness of permanent magnets are analyzed by finite element method to find out the scheme with the largest linear control range of the gap flux density. Finally, the rule of influence of permanent magnet thickness on permanent magnet working point, magnetic field regulation ability, gap flux density linear control range, no-load back EMF and rated load torque is summarized.