The Transactions of The Korean Institute of Electrical Engineers (전기학회논문지)

The Korean Institute of Electrical Engineers (대한전기학회)
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Parallel Sensorless Speed Control using Power Angle for Dual SPMSMs Fed by a Single Inverter

단일 인버터 기반 두 대의 영구자석 동기전동기 병렬운전에서 전력각을 이용한 속도제어기법

  • Kim, Kyung-Hoon (School of Electronics Engineering, Kyung-pook National University) ;
  • Yun, Chul (School of Electronics Engineering, Kyung-pook National University) ;
  • Kwon, Woo-Hyen (School of Electronics Engineering, Kyung-pook National University)
  • Received : 2017.06.13
  • Accepted : 2017.09.13
  • Published : 2017.10.01
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Abstract

This paper proposes a sensorless speed control algorithm for parallel-connected dual Surface-mounted Permanent Magnet Synchronous Motors fed by a single inverter. For stable parallel operation of synchronous motors with a single inverter, each motor has to be constantly kept in the synchronization state regardless of load torque. If the master motor with the larger load is controlled, the synchronous state will be maintained. Therefore, detection of the master motor is essential. Conventionally, the master motor is determined by comparing the rotor position error from the relation between the back-EMF for torque angle and the flux position. consequently, the position sensor is deemed essential for finding the rotor position. In this paper, we proposed a method that decides the magnitude of the load from the power angle of two motors due to the load variation and selects the motor to control through the sign function for the sensorless speed control without the position sensor. The results of simulation and experiment conducted verify the efficacy of the proposed method.

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References

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