Variable Angle Square-Wave Voltage Injection for Sensorless Control of PMSM Considering Cross-Saturation Effect
Wu Chun1, Chen Ke1, Nan Yurong1, Wei Chun1, Zeng Zhicheng2
1. College of Information Engineering Zhejiang University of Technology Hangzhou 310023 China; 2. Hangzhou Silan Integrated Circuit Co. Ltd Hangzhou 310012 China
Abstract：The conventional estimation method of d-axis square-wave voltage injection can be affected by magnetic field cross-saturation,which causes rotor position estimation error.Therefore,a variable angle square-wave voltage injection for sensorless control of permanent magnet synchronous machine (PMSM) is proposed considering the compensation of cross-saturation effect.The injection voltage synchronous rotation coordinate fg is introduced and a pair of square-wave voltages is injected on the f-axis.The angle between the f-axis and the estimated d-axis is defined as the injection angle,which changes with different magnetic field cross-saturation effects.The g-axis differential current is calculated for position estimation.Due to the change of the injection angle,the g-axis differential current will no longer contain cross-saturation related information,and accurate position estimation can be realized.Finally,the proposed variable angle square-wave injection method is compared with the conventional estimated d-axis square-wave voltage injection method by experiments.The experimental results show that under different load torques and different speeds,the proposed method has high accurate rotor position estimation and fast dynamic-state performance,and is easy to implement.
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2020, Vol. 35 
