关键词: 磁链观测, 内置式永磁同步电机, 前馈补偿, 最优转矩电流比, 查表法, 无位置传感器

Abstract: Aiming at the saliency of IPMSM, a MTPA control strategy of IPMSM sensorless control based on flux observer was proposed to improve the energy efficiency ratio of the load torque time-varying system. Based on the IPMSM voltage equation, the method of detecting the rotor position by the rotor flux observer was analyzed, the feed forward compensation was added to the traditional rotor flux observer, and the arctangent method was used to calculate rotor position, the mathematical relationships between stator current and torque angle,and between electromagnetic torque and torque angle were analyzed. A new look-up table method was proposed to realize MTPA control. This method separatered the look-up table data from the motor parameters, and used linear interpolation to reduce table data quantity. This method was simulated by MATLAB/Simulink in the load torque time-varying system.The result showed that the new MTPA control method required a smaller output current than the i_d=0 control method under the same output torque condition,which indicated the effectiveness of this method.

Key words: flux observation, interior permanent magnet synchronous motor (IPMSM), feedforward compensation, maximum torque per ampere (MTPA), look-uptable method, sensorless