High-Precision Acquisition Method of Position Signal of Permanent Magnet Direct Drive Servo Motor at Low Speed

Deli Zhang, Zhaopeng Dong, Feifei Bu (), Zijie Gu and Zitao Guo
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Deli Zhang: College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China
Zhaopeng Dong: College of Automation, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China
Feifei Bu: College of Automation, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China
Zijie Gu: College of Automation, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China
Zitao Guo: College of Automation, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China

Energies, 2023, vol. 16, issue 11, 1-15

Abstract: This paper studies a method for high-precision acquisition of position signals for permanent magnet direct drive servo motors at low speed. First of all, the problem of poor position feedback accuracy and sensor feedback delay in the low-speed operation of the permanent magnet direct drive servo motor is analyzed. Secondly, through analysis and simulation, it is found that the interpolation method can play a certain role in compensating the rotor position signal. However, when the speed is close to 0, the output signal of the sensor will fluctuate in a short time, which will affect the speed control accuracy. Therefore, this paper uses the observer method to achieve high-precision acquisition of the position signal of the permanent magnet direct drive servo motor at low speed. The observer method adopts the idea of combining the system model and closed-loop control. Additionally, it makes full use of the parameter information of the motor system. The control performance of the motor can be better guaranteed through the design of the observer parameters and the accuracy of the rotor position estimation result has been greatly improved. Finally, an experimental platform for permanent magnet direct drive servo motors is built, and the rotor position signal acquisition method based on the observer method is verified to have good performance through simulation and experiments. Not only the accuracy of the rotor position estimation result is improved, but also the motor control performance is improved, realizing the stable operation of the permanent magnet direct drive servo motor at low speed.

Keywords: permanent magnet direct drive servo motor; low speed operation; position signal acquisition; state observer; interpolation method (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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