摘要：采用87C196MC单片机分别用同步调制、异步调制、混合调制三种方法实现电压空间矢量脉宽调制对异步电机的变频调速。实验结果表明：SVPWM直接控制了气隙磁通,使电机工作稳定,且具有良好的性能；混合调制时电机电流的谐波小，电机的噪声低。
关键词：电压空间矢量脉宽调制（SVPWM）；同步调制；异步调制；混合调制

Abstract:Using 87C196MC SCM achieve respectively the voltage space vector PWM inverter to achieve the frequency control of induction motor at synchronous modulation，asynchronous modulation and mixed modulation.The results show that SVPWM direct control of the air-gap flux，so that electrical work stable and good performance；Using mixed modulation can make motor current harmonic smaller and the motor noise is lower.
Key Words:Synchronization modulation；Asynchronism modulation；Mix modulation