Journal of Electrical Engineering and Technology

The Korean Institute of Electrical Engineers (대한전기학회)
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PIR Speed Control Method of AC Motors Considering Time Delay in Speed Information

  • Lee, Jung-Ho (Dept. of Electrical Engineering, Kyungpook National University) ;
  • Choi, Jong-Woo (Dept. of Electrical Engineering, Kyungpook National University)
  • Received : 2017.05.12
  • Accepted : 2017.08.07
  • Published : 2017.11.01
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Abstract

Applying a periodic load torque to an AC motor generates a ripple, which is synchronized to the frequency of the periodic load torque, at the speed of the motor. Consequently, numerous studies have focused on reducing the speed ripple caused by the load torque. However, it is difficult to reduce the speed ripple when there is a time delay in acquiring speed information, such as that from a sensorless control. Therefore, we propose a speed control method for reducing speed ripples caused by a periodic load torque when there is a time delay in acquiring the speed information. The proposed method is verified by conducting simulations using the Simulink program from MATLAB, and by applying the method to an actual motor in which speed ripples occur due to a periodic load torque that is synchronized with the speed of the motor.

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