永磁同步电动机恒磁链控制特性分析

An analysis of permanent magnet synchronous motors with constant flux linkage control

在永磁同步电机数学模型的基础上,根据电机全磁链ψ0和转子永磁体与定子交链的磁链ψf相等的原则,介绍了恒磁链控制法.并通过推导永磁同步电机电磁转矩与定子电流的数学方程,采用查表法建立电流与转矩的拟合关系,使用MATLAB仿真软件建立电机模型,并将恒磁链控制分别与id=0和最大转矩电流比(MTPA)控制方法做了详细对比.仿真结果表明,恒磁链控制法下系统的稳态误差仅有0.478%,稳定性很优秀,且调整时间分别比id=0控制和MTPA控制要快7.7%和27.6%,且功率因数为0.72,均高于id=0控制的0.62和最大转矩电流比控制的0.67.

We introduced the mathematical model of permanent magnet synchronous motors（PMSM） according to the principle of the full flux linkage of motors and the rotor flux intersected by the stator flux being equal as well as the theory of constant flux linkage control. Through the mathematical equation of electromagnetic torque and the stator current of permanent magnet synchronous motors, the relationship between the current and the torque was established by the fitting method of table lookup. The motor model was established by using MATLAB software simulation. The constant flux linkage control was compared with the control of id = 0 and maximum torque per ampere. The simulation results indicated that under constant flux linkage control, the steady-state error was 0. 478%, the adjusting time was 7.7% and 27.6% faster than the first two kinds of control. Meanwhile, the power factor of constant flux linkage control was 0.72, which was also greater than that of the first two kinds of control（0.72 and 0.62） respectively.