한국정밀공학회지 (Journal of the Korean Society for Precision Engineering)
- 제14권5호
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- Pages.118-127
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- 1997
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- 1225-9071(pISSN)
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- 2287-8769(eISSN)
스텝모터의 진동 저감을 위한 마이크로 스텝 구동에 관한 연구
A Study on the Micro Stepping Drive to Reduce Vibration of Step Motor
- 신규범 (한국타이어 제조(주) 엔지니어링 본부) ;
- 이정우 (한국과학기술원 기계공학과 대학원) ;
- 오준호 (한국과학기술원 기계공학과)
- Shin, Gyu-beom ;
- Lee, Jeong-Woo. ;
- Oh, Jun-Ho.
- 발행 : 1997.05.01
초록
In this study, We use microstep control to reduce vibration of step motor. Microstep control of step motor is usually thought of as an extension of conventional step motor control technology. The essence of micro stepping is that we divide the full step of a step motor into a number of substep called microstep and cause the stepmotor to move through a substep per input pulse. In ideal case, by controlling the individual phase currents of a two-phase step motor sinusoidally we can get uniform torque and step angle. But due to the nonlinear characteristics of the step motor, we need to compensate current waveform to improve the over-all smoothness of the conventional micro stepping system. We implement digital Pulse Width Modul- ation (PWM) driver to drive step motor and microphone was used for detecting vibration. Driver enables speed change automatically by increasing or decreasing micro stepping ratio which we call Automatic Switching on the Fly. To compensate the torque harmonics, neural network is applied to the system and we found compensated optimal input current waveform. Finally we can get smooth motion of step motor in a wide range of motor speed.