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Acoustic Noise and Vibration Reduction of Coreless Brushless DC Motors with an Air Dynamic Bearing
양이우,김영석,김상욱 대한전기학회 2009 Journal of Electrical Engineering & Technology Vol.4 No.2
This paper presents the acoustic noise and mechanical vibration reduction of a coreless brushless DC motor with an air dynamic bearing used in a digital lightening processor. The coreless brushless DC motor does not have a stator yoke or stator slot to remove the unbalanced force caused by the interaction between the stator yoke and the rotor magnet. An unbalanced force makes slotless brushless DC motors vibrate and mechanically noisy, and the attractive force between the magnet and the stator yoke increases power consumption. Also, when a coreless brushless DC motor is driven by a 120° conduction type inverter, high frequency acoustic noise occurs because of the peak components of the phase currents caused by small phase inductance and large phase resistance. In this paper, a coreless brushless DC motor with an air dynamic bearing to remove mechanical vibration and to reduce power consumption is applied to a digital lightening processor. A 180° conduction type inverter drives it to reduce high frequency acoustic noise. The applied methods are simulated and tested using a manufactured prototype motor with an air dynamic bearing. The experimental results show that a coreless brushless DC motor has characteristics of low power consumption, low mechanical vibration, and low high frequency acoustic noise.
축소차원 Luenberger 관측기를 이용한 단상 PWM 컨버터의 고역률 제어
양이우(lee-Woo Yang),이용근(Yong-Geun Lee),김영석(Young-Seok Kim) 전력전자학회 1999 전력전자학술대회 논문집 Vol.1999 No.7
In this paper, a current control system for single phase PWM AC/DC converter without the source voltage sensors is proposed. The sinusoidal input current and unity effective power factor are realised based on the estimated source voltage in the controller. The estimation of source voltage is performed by the reduced-order Luenberger observer using actual currents. The estimated source voltage is used to accomplish unity power factor.<br/> The proposed method is proved by experiments.
슬라이딩 모드 관측기를 이용한 3상 PWM 컨버터의 고역률 제어
양이우(Iee-Woo Yang),김명현(Myoung-Hyun Kim),김영석(Young-Seok Kim) 전력전자학회 1999 전력전자학술대회 논문집 Vol.- No.-
In this paper, the authors propose a current control system for three phase PWM AC/DC converter without the source voltage sensors, The sinusoidal input current and unity effective power factor are realised based on the estimated source voltage in the controller, The estimation of source voltage IS performed based on the sliding mode observer using the actual currents and the actual DC link voltage, The estimated source voltage is used to accomplish unity power factor.<br/> The proposed method is proved by simulations.
LQR 제어기를 이용한 HDD용 BLDC 모터의 속도 센서리스 제어
양이우(lee-Woo Yang),김영석(Young-Seok Kim),김상욱(Sang-Uk Kim),김현중(Hyun-Jung Kim) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.4
This Paper presents a solution to control the Brushless DC Motor(BLDCM) in Hard Disk Drive(HDD) using the Linear Quadratic Regulator(LQR). Generally, The speed of BLDCM in HDD is controlled by the lead angle control or the input voltage control using PAM(Pulse Amplitude Modulation) etc. These control methods have speed overshoot in speed control and need the long time until BLDCM reaches at the steady state. In order to improve the performance, this paper present the PI speed controller using the LQR based on vector control and the rotor position detection methods at the space vector PWM inverter. The proposed methods are proved by the simulation and experimental results.
공기 동압 베어링을 갖는 디지털 라이트닝 프로세서 모터용 코어리스 및 슬롯리스 BLDC 모터의 특성 분석 및 비교
梁二宇(Iee-Woo Yang),金榮石(Young-Seok Kim),金尙郁(Sang-Uk Kim) 대한전기학회 2007 전기학회논문지 Vol.56 No.6
This paper presents the analysis for power consumption, mechanical vibration and acoustic noise characteristics of the Coreless and Slotless Brushless DC motor in Digital Lightening Processor(DLP) Motor with the Air-Dynamic Bearing. The Coreless BLDC motor has not the stator yoke as well as the stator slot to remove the unbalance force by the interaction between the stator yoke and Air-Dynamic Bearing clearance. The assembling tolerance and the processing error make the air-gap difference between the magnet and the stator yoke, which occurs the unbalanced electro-magnetic force in the Slotless BLDC motor. It imposes the air-dynamic bearing on the disturbance force and makes the Air-Dynamic Bearing vibrated and noised. Also, The attractive force between the magnet and the silicon steel stator yoke increases the power consumption. In this paper, the power consumption, mechanical vibration and acoustic noise of the Coreless BLDC motor and the Slotless BLDC motor with the silicon steel stator yoke are simulated, analyzed, and tested using the manufactured proto-type motors with Air-Dynamic bearing. The simulated and tested results present that the Coreless BLDC motor without the silicon steel stator yoke has the lower mechanical vibration and noise, and lower power consumption than the Slotless BLDC motor with the silicon steel stator yoke in Digital Lightening Processor Motor with Air-Dynamic Bearing.
축소차원 Luenberger 관측기를 이용한 단상 PWM 컨버터의 고역율 제어
양이우(Lee-Woo Yang),유지용(Ji-Yong Yoo),김영석(Young-Seok Kim) 전력전자학회 1998 전력전자학술대회 논문집 Vol.- No.-
In this paper, the authors propose a current control system of single phase PWM AC/DC converter without the<br/> .source voltage sensors. The sinusoidal input current and unity effective power factor are realised based on the estimated source voltage in the controller. The estimations of source voltage are performed based on the reduced-order Luenberger observer using actual currents. The estimated source voltage is used to accomplish unity power factor.<br/> The proposed method is proved by simulations