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Sensorless Control of IPMSM with a Simplified High-Frequency Square Wave Injection Method

  • Alaei, Ahmadreza ;
  • Lee, Dong-Hee ;
  • Ahn, Jin-Woo ;
  • Saghaeian Nejad, Sayed Morteza
  • Received : 2017.09.05
  • Accepted : 2018.01.26
  • Published : 2018.07.01

Abstract

This paper presents a sensorless speed control of IPMSM (Interior Permanent Magnet Synchronous Motor) using the high-frequency (HF) square wave injection method. In the proposed HF pulsating square wave injection method, injection voltage is applied into the estimated d-axis of rotor and high-frequency induced q-axis current is considered to estimate the rotor position. Conventional square wave injection methods may need complex demodulation process to find rotor position, while in the proposed method, an easy demodulation process based on the rising-falling edge of the injected voltage and carrier induced q-axis current is implemented, which needs less processing time and improves control bandwidth. Unlike some saliency-based sensorless methods, the proposed method uses maximum torque per ampere (MTPA) strategy, instead of zero d-axis command current strategy, to improve control performance. Furthermore, this paper directly uses resultant d-axis current to detect the magnet polarity and eliminates the need to add an extra pulse injection for magnet polarity detection. As experimental results show, the proposed method can quickly find initial rotor position and MTPA strategy helps to improve the control performance. The effectiveness of the proposed method and all theoretical concepts are verified by mathematical equations, simulation, and experimental tests.

Keywords

IPMSM(interior permanent magnet synchronous motor);Sensorless control;Square wave voltage injection;Rotor position estimation;MTPA(maximum torque per ampere);Magnet polarity detection

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Acknowledgement

Grant : Human Resources Program in Energy Technology

Supported by : Korea Institute of Energy Technology Evaluation and Planning(KETEP)