Research on Torque Characteristics of a Modular Arc-Linear Flux Switching Permanent-Magnet Motor

The modular arc-linear flux switching permanent-magnet motor (MAL-FSPM) used for scanning system is researched in this paper by the finite element method (ELM). The MAL-FSPM combines characteristics of the flux switching permanent-magnet motor and linear motor and can realize the direct driving and limited angular movement. Due to the double salient effect, the cogging torque including slot torque and end torque is very high. In order to reduce the cogging torque, a method of magnetizing the permanent magnet in reverse direction combined with rotor segmentation is proposed. By means of the proposed method, peak-peak cogging torque and load torque ripple are reduced effectively. Besides, the smooth operation range and an average load torque of the motor are also optimized. The effectiveness of the method is verified by both 2D and 3D FE models.