电动汽车用永磁同步电动机功率特性及弱磁扩速能力研究(一)——恒转矩控制及弱磁控制时的功率特性

STUDY ON POWER CAPABILITY AND FLUX-WEAKENING LEVEL OF PERMANENT MAGNET SYNCHRONOUS MOTOR IN ELECTRIC VEHICLE APPLICATION (Ⅰ)-POWER CAPABILITY WHEN CONSTANT TORQUE AND FLUX WENKENING CONTROL

采用d、q坐标系下的相量分析方法 ,研究永磁同步电动机 (PMSM )、特别是电动汽车用PMSM 详细分析了不同弱磁率、不同凸极率对电机电压、电流相量变化轨迹的影响 ,及由此引起的电机的功率特性及弱磁扩速能力的差异 推导出以弱磁率和凸极率为变量的PMSM的弱磁扩速倍数表达式 ,由此得出提高PMSM弱磁扩速能力的根本途径 。

The phasor method is adopted for the first time to analyze the influence of the demagnetizing coefficient, saliency ratio on the loci of voltage and current and then on the power capability and flux weakening level of permanent magnet synchronous motor (PMSM)especially in electric vehicle(EV) application. The description of the PMSM's flux weakening adjusting speed capability is worked out and expressed with the demagnetizing coefficient and saliency ratio, by which the radical methods to enhance the PMSM's flux weakening capability are concluded, and the flux weakening capability of PMSM with different magnet structures is compared.