PERMANENT MAGNET MOTOR STRUCTURE REDUCING TORQUE PULSATION OF SURFACE MOUNTED PERMANENT ROTOR

摘要

A permanent magnet motor structure reducing the torque pulsation of a surface mounted permanent rotor, the motor structure comprising a stator assembly (1) and a rotor assembly (2); the stator assembly (1) comprises a stator core (11) and a coil winding (12); the stator core (11) comprises a yoke portion (111) and a plurality of tooth portions (112) extending out of the yoke portion (111); trunkings (113) are formed between neighboring tooth portions (112); the rotor assembly (2) comprises a rotor core (21) and a plurality of permanent magnets (22) installed on the surface of the rotor core (21); the plurality of permanent magnets (22) are arranged at intervals according to N pole and S pole; a rotor sheath (23) is installed outside the rotor assembly (2) and is divided into at least two segments axially; and the magnetic conductivity of the first segment of the rotor sheath (23) is different from the magnetic conductivity of the second segment of the rotor sheath (24). The motor structure is simple, and is easy to realize, has a small torque pulsation and a high fundamental wave torque, and ensures smooth operation of the motor.