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| Dynamic Inductance Identification Method and Rotor Position Estimation Error Compensation Strategy for IPMSM |
| Li Feng1, Che Jin1, Liu Daming1, Xia Chaoying2, Wang Hongyan3 |
1. School of Physics and Electronic-Electrical Engineering Ningxia University Yinchuan 750021 China;
2. School of Electrical and Information Engineering Tianjin University Tianjin 300072 China;
3. Ningxia Agricultural Internet of things Engineering Technology Research Center Yinchuan 750004 China |
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Abstract Sensorless control of interior permanent magnet synchronous motor (IPMSM) can be achieved usually by using the rotating high-frequency voltage injection method at low and zero speed. However, the rotor position estimation error occurs when the cross coupling effect exists in d-axis and q-axis magnetic circuits. Moreover, the rotor position estimation error is concerned with d-axis and q-axis dynamic inductances and cross coupling dynamic inductance. To overcome impacts of the magnetic circuit saturation effect and cross coupling effect on dynamic inductances and rotor position estimation, a fractional-step identification method of dynamic inductances and a compensation strategy of the rotor position estimation error were proposed in this paper. After an inductance proportionality factor was obtained offline using a d-axis high-frequency voltage injection algorithm, a dynamic inductance identification algorithm based on rotating high-frequency voltage injection was applied to sensorless control of IPMSM, and then not only the identification of dynamic inductances but the calculation and compensation of the rotor position estimation error could be achieved online. Finally the feasibility and availability of the dynamic inductance identification method and rotor position estimation error compensation strategy were validated by experimental results.
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Received: 30 July 2018
Published: 17 December 2018
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2018, Vol. 33 
