Duty Ratio-Displacement Model in PWM Control of Voice Coil Actuator

보이스 코일 액츄에이터의 PWM 제어에서 듀티비-변위 모델 연구

  • 황진동 (부산대학교 지능기계공학과 대학원) ;
  • 곽용길 (부산대학교 지능기계공학과 대학원) ;
  • 김주현 (대한송유관공사) ;
  • 김선호 (동의대학교 메카트로닉스공학과) ;
  • 안중환 (부천대학교 기계공학부)
  • Published : 2007.06.30

Abstract

Voice coil actuator is used linear motion system that requires precision positioning control. In order to control precision positioning of voice coil actuator, relation model between duty ratio and moving displacement of voice coil actuator is needed. This paper present a duty ratio - displacement model in PWM control of voice coil actuator. Transfer function of voice coil actuator is obtained by combining voice coil motor's equation of motion with the equation of circuit and characteristic of voice coil motor. Consider to initial condition of velocity and current, transfer function is transformed mathematical model. The induced model can predict output displacement, velocity and current according to duty ratio and amplitude. The model is verified by experimental tests such as velocity and displacement response of voice coil motor. Simulated results have tracking errors of less than 10 percent of experimental results.

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