一种表贴式永磁同步电机电流矢量闭环I/f控制方法

An I/f Control Method With Closed-loop Regulation of Current Vector for Surface Permanent Magnet Synchronous Motor Drives

针对表贴式永磁同步电机(surface permanent magnet synchronous motor,SPMSM)开环I/f控制方法存在转速易波动、易失步、电流幅值固定的缺点,提出一种电流矢量闭环I/f控制方法。通过对SPMSM在电流矢量定向γ-δ坐标系下模型的分析,在SPMSM开环I/f控制结构的基础上引入瞬时功率反馈调节算法,通过电机的瞬时有功功率调节电流矢量的转速,在电磁转矩中增加阻尼特性分量,改善电机的转速收敛特性;通过瞬时无功功率调节电流矢量的幅值,使SPMSM运行在最大转矩/电流比状态,提高电机的效率和稳定性。该控制方法无需电机转速信息,且在最大转矩/电流比状态具有渐近稳定性。仿真和实验结果验证了该控制方法在电机起动、稳定运行和负载突变时的良好性能。

For the disadvantages in the open loop I/f control method of surface permanent magnet synchronous motor （SPMSM）, such as the speed fragility, prone to lose synchronism and fixed current amplitude, an I/f control method with closed loop regulation of current vector was proposed. After analyzing SPMSM model in the current vector oriented 7-8 coordinates, instantaneous power based feedback regulations were added to the structure of basic open-loop I/f control method. The speed of current vector was corrected by instantaneous reactive power, which adds damping torque component in electric torque to improve the motor speed convergence performance. The amplitude of current vector was adjusted by instantaneous active power, which improves the stability of system, and also maintains the steady operation point on the maximum torque/current condition. The method could work properly without motor speed information, and was asymptotic stable on the maximum torque/current condition. Simulation and experimental results verify the feasibility of the proposed method during startup, steady state and load torque varying process.