关键词: 地铁牵引, 双 U 形, 永磁电机, 转矩特性

Abstract: The double U-shaped interior permanent magnet motor can exhibit good characteristic with high permanent magnet torque and reluctance torque during operation. It has the advantages of conventional permanent magnet motors and permanent magnet assisted synchronous reluctance motors. It can well adapt to the needs of subways traction application. This article introduces the basic theory of permanent magnet motors. The requirements for the design of permanent magnet traction motors in terms of high-speed back electromotive force, traction torque characteristic, braking torque characteristics and equivalent rated power are presented. The winding configuration, pole slot matching, torque characteristics, cooling and material selection of motor are analyzed. Magnetic field distribution, phase voltage, total harmonic distortion rate of voltage, electromagnetic torque, torque ripple and power factor of double U-shaped interior permanent magnet motor under six operating conditions are analyzed. The results show that double U-shaped interior permanent magnet motor for subway traction application studied in this article can well meet the requirements of high-speed back electromotive force, equivalent rated power, traction torque characteristic, and braking torque characteristics. Torque ripple, phase voltage, voltage harmonic distortion rate and power factor have good performance.

Key words: subway traction, double U-shaped, permanent magnet motor, torque characteristics