An Improved Rotor Position Estimation Method for PMSM Based on Pulsating Square-Wave-Type Voltage Injection

2019 International Conference on Advanced Electronic Materials, Computers and Materials Engineering

无线电电子学;计算机科学;材料科学

Lin, Cheng^1^2 ; Sun, Jiaxu^1

National Engineering Laboratory for Electric Vehicles, Beijing Institute of Technology, Beijing

100081, China^1

Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing Institute of Technology, Beijing

100081, China^2

关键词: High frequency HF;    Injection frequencies;    Permanent Magnet Synchronous Motor;    Rotor position estimation;    Sampling frequencies;    Sinusoidal voltage;    Voltage injection;    Voltage signal injection;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/563/5/052101/pdf
DOI  :  10.1088/1757-899X/563/5/052101

来源: IOP

【 摘 要 】

This paper presents a pulsating high-frequency square-wave-type voltage signal injection based sensorless rotor position estimation method for permanent magnet synchronous motors (PMSM). In order to increase the injection frequency so as to enhance the control system's bandwidth, square-wave-type voltage is injected instead of sinusoidal voltage. To avoid disturbances, the sampling frequency is set as equal to the PWM switching frequency so that the injection frequency can be half of the switching frequency. Due to the characteristics of the square-wave-type voltage, the signal processing is further simplified without the use of filters, which can eliminate the time delay and increase the system's computational efficiency and feasibility. As a result, the rotor position estimation performance is improved and the sensorless control system's dynamics is enhanced. Results of simulation verify the effectiveness of the proposed method and its applicability to PMSM sensorless control systems.