Error Analysis and Compensation of Servo Motor Rotor Position Detection
ZHANG Tian-heng,TONG Peng,YANG Ji-sen
Engineering Research Center of Mechanical Testing Technology and Equipment, Ministry of Education, Chongqing University of Technology, Chongqing 400054,China
Abstract：Aiming at the problems of low accuracy, inconvenient installation and high cost in current motor rotor position measurement, a design scheme of rotor position sensor based on the combination of tunnel magnetoresistance effect and time grating technology is proposed. On the premise of not destroying the original structure of the motor, a pair of space orthogonal TMR chips are embedded in the front cover of the motor to realize the embedded position precise detection. According to the principle of TMR sensor rotor position calculation, the error components caused by installation error, electrical error and electromagnetic noise error of TMR sensor are analyzed. an error compensation method based on extreme learning machine is proposed. The model optimal parameters are obtained through training the real sample values and measured values. According to the model parameters, Rotor position error model is established, which is used to realize rotor position error compensation.The experimental results show that under the uniform speed of 2000r/min, the maximum measurement error of rotor position before compensation is 4.64° and the rotor position error is 0.315° after compensation, and the accuracy is improved by 93.2%.The embedded rotor position detection method provides a new method for motor rotor position detection.
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2022, Vol. 43 
