Independent Phase Current Reconstruction Strategy for IPMSM Sensorless Control Without Using Null Switching States

• Published in: IEEE transactions on industrial electronics (1982) Vol. 65; no. 6; pp. 4492 - 4502
• Main Authors: Lu, Jiadong, Zhang, Xiaokang, Hu, Yihua, Liu, Jinglin, Gan, Chun, Wang, Zheng
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.06.2018; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Electric potential; Electrical equipment; Estimation; Fault tolerance; high frequency (HF) voltage injection; Integrated circuits; interior permanent magnet synchronous motor (IPMSM); Modularity; Permanent magnet motors; Permanent magnets; Phase current; phase current reconstruction; Pulse width modulation; Reconstruction; Sensorless control; Switches; Switching; Synchronous motors; Voltage pulses
• ISSN: 0278-0046; 1557-9948
• DOI: 10.1109/TIE.2017.2767542

This paper proposes a new phase current reconstruction scheme without using null switching states for interior permanent magnet synchronous motor (IPMSM) sensorless control. The phase currents are independently reconstructed and no additional test voltage pulses are required. First, the principle of the basic phase current reconstruction for IPMSM drive system is analyzed in detail. Then, an independent phase current reconstruction scheme without using null switching states is proposed. The current reconstruction dead zone is divided into six sectors, and each sector is split into three parts with corresponding vector synthesis methods. Meanwhile, the null switching states, V 000 and V 111 , are removed from the proposed scheme. In this case, the zero vector is synthesized by the other available vectors. Finally, the reconstructed threephase currents are utilized for high frequency sine-wave voltage injection-based position estimation. The effectiveness of the proposed scheme is verified by experimental results on a 5 kW IPMSM motor prototype, which shows that the reconstructed phase currents track the actual currents accurately under different working conditions.