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전류용 보조권선의 적정여자에 의한 SRM에서의 진동과 소음의 저감
추영배 거제전문대학 1999 論文集 Vol.8 No.-
In spite of the simple and rugged motor structure and drive circuits, switched reluctance motor(SRM) has good overall performance over a wide torque-speed range. Most serious problem of SRM is the higher torque ripple compared with conventional machines, which is inherently generated because of the torque production mechanism by the step pulse m.m.f. and contributes to vibration and acoustic noise. This torque ripple is mainly induced by radial force on the phase commutation region and in the vibration and acoustic noise characteristics, the frequency or motor speed of peak vibrations and acoustic noises is coincided with the natural resonant frequency of the magnetic structure and frame materials. This paper suggest the new electromagnetic structure of SRM with auxiliary commutation winding and the technique which allows vibration and acoustic noise reduction through smoothing commutation by exciting the commutation winding with d.c. source. The laboratory drive demonstrates that the implementation of this noise cancellation technique is very useful in SRM drive.
가변전압과 어드반스각의 조절을 이용한 SRM의 상전류 파형개선에 대한 연구
추영배 거제전문대학 1998 論文集 Vol.7 No.-
Although switched reluctance motor(SRM) has the electro-magnetic structure proper to be driven by pulse currents with the type of rectangular wave, actual phase currents by voltage-fed inverter has various waveforms according to the operating speed, the load torque and switching angle. In this paper, one variable-speed SRM system is presented in which the motor is driven by single pulse current with flat-topped waveform independently of load conditions and operating speed. In this system, exciting voltage is regulated to balance with the speed voltage in inductance increasing region first, and second advance angle is modulated by the difference of currents detected at two point in that region. The validity of this system are verified by the experimental results in various load conditions.
능동역률보정방식의 도입에 의한 권선형 유도 전동기의 슬립전력 회수특성의 개선
추영배 거제전문대학 1998 論文集 Vol.6 No.-
Static Scherbius system is one of the latest winding induction motor drive systems which has many advantages such as high efficiency, excellent controllability and so on. But for more wide application of this system some conditions should be improved such as high reactive power and additive need of power transformer in the slip power recovery process. This paper deals with the high performance static Scherbius type slip power recovery system. In this system, active power factor correction method is used in DC side instead of transformer in AC side for the proper matching the rotor voltage with line voltage, and speed can be controlled by the chopper duty ratio, not by inverter firing angle. This results that the reactive power produced by phase controlled inverter and diode rectifier can be greatly reduced with linear speed regulation. Moreover, the harmonic components in the rotor current caused by the commutation of diode rectifier can be considerably suppressed.