• Title/Summary/Keyword: Brushless DC motor

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Electrical Characteristics and Electromagnetic Excitation Force Comparison of PM Motor according to the Driving method (영구자석형 전동기의 구동방법에 따른 전기적 특성 및 전자기적 가진원 분석)

  • Lee, Su-Jin;Kim, Do-Jin;Lee, Byeong-Hwa;Hong, Jung-Pyo
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.23 no.2
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    • pp.144-151
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    • 2013
  • This paper presents a result of the mechanical noise and vibration analysis as well as the electrical characteristics analysis of the permanent magnet(PM) motor according to the driving method that is Brushless DC(BLDC) drive and Brushless AC(BLAC) drive. To do that, the characteristics of the PM motor, which have the same output power but different driving method, are investigated. At that time, the characteristics such as torque, torque ripple and flux density, and so on, are obtained by finite element analysis(FEA). Besides, noise and vibration are obtained by spectrum analysis. The magnetic noise is defined as noise generated from vibrations due to electromagnetic excitation force. In this paper, the electromagnetic excitation force is analyzed and design process of noise reduction is proposed. Finally, The validity of the analysis results is verified by test.

Characteristics Comparison of PM Motor according to the Driving method (영구자석형 전동기의 구동방법에 따른 전자기적 특성 및 진동 소음 비교)

  • Hong, Jung-Pyo;Lee, Su-Jin;Kim, Do-Jin;Lee, Byeong-Hwa;Jang, Woo-Kyo
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2012.10a
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    • pp.522-527
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    • 2012
  • This paper presents a result of the mechanical noise and vibration analysis as well as the electrical characteristics analysis of the permanent magnet (PM) motor according to the driving method that is Brushless DC (BLDC) drive and Brushless AC (BLAC) drive. To do that, the characteristics of the PM motor, which have the same output power but different driving method, are investigated. At that time, the characteristics such as torque, torque ripple and flux density, and so on, are obtained by finite element analysis (FEA). Besides, noise and vibration are obtained by spectrum analysis. The magnetic noise is defined as noise generated from vibrations due to electromagnetic excitation force. In this paper, the electromagnetic excitation force is analyzed and design process of noise reduction is proposed. Finally, The validity of the analysis results is verified by test.

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A Current Control Algorithm for Torque Ripple Reduction of Four-Switch Three-Phase Brushless DC Motors (4스위치 3상 BLDC 전동기의 토크 리플 저감을 위한 전류제어 알고리즘)

  • Park S.H.;Kim T.S.;Lee B.K.;Hyun D.S.
    • Proceedings of the KIPE Conference
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    • 2003.07a
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    • pp.472-476
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    • 2003
  • In this paper, a new current control algorithm is proposed for four-switch three-phase brushless DC(BLU) motor drives, which are suitable for low cost applications. A current reference generation scheme is developed and Implemented to obtain high performance characteristics in the four-switch system, such as small torque ripple and fast dynamic speed/torque response. Moreover, the proposed scheme can successful1y eliminate the torque ripple during commutations, so that it can be expected that the four-switch system can be much more practically applied for the industrial application areas.

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Design and Characteristic Study of Brushless DC Motor for Traction Vehicle Considering the Running Condition (주행조건을 고려한 Traction용 BLDC 전동기 설계 및 특성 연구)

  • Kim, Do-Sun;Lee, Sung-Hyung;Son, Dong-Hyeok;Cho, Yun-Hyun;Kim, Byong-Kuk
    • Proceedings of the KIEE Conference
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    • 2009.07a
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    • pp.855_856
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    • 2009
  • 본 연구는 차량 주행조건에 따른 주행저항을 계산하여 각각의 출력 조건을 만족하는 전동기를 설계하였다. 또한 실험계획법의 일종인 반응표면법을 적용하여 코깅 토크를 저감시켜 전동기의 특성을 향상시켰다. 유한요소법으로 d,q축 동기 리액턴스를 산출하여 Brushless DC 전동기의 자기 포화 영역에 따른 설계의 신뢰성을 평가하였다. 마지막으로 시작품 제작을 통하여 시뮬레이션과 실험 결과를 비교하였다.

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The optimum geometric design of stators for brush less DC linear motors (브러시없는 직류 선형 모터의 고정자 형상 최적 설계)

  • 최문석;김용일;이상락
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1995.10a
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    • pp.1173-1176
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    • 1995
  • We design and analyze two type stators for brushless DC linear motors by the experiment and the computational analysis. For a U-shape stator, the maximum manetic flux density by the finite element method(FEM) is large than that by the experiment by 1.0~2.2%. The result by the FEM is so accurate that it can be applied to the geometric design for the optimization. To increase the maximum magnetic flux density, we suggest an improved stator and analyze it by the 3-D and 2-D models. The maximum magnetic flux density of the improved stator is large than that of the U-Shape stator by 2.7%. Considering the size of the improved stator and maximum magnetic flux density, we determine that the optimized thickness is 5mm for a given specification.

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Precise Speed Control of Brushless DC Motors using Hall sensor (홀센서를 이용한 BLDC모터의 정밀한 속도 제어)

  • Kim, Kwang-Young;Shin, Doo-Jin;Yu, Byung-Sam;Huh, Uk-Youl;Lee, Je-Hee
    • Proceedings of the KIEE Conference
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    • 1999.07b
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    • pp.573-575
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    • 1999
  • Brushless DC motor which has the characteristics of high efficiency and high torque, can be controlled speed by the encoder or resolver. But these sensors cost highly and have the problem that they increases the size. This paper proposes a speed control by Hall-Sensor. which is small and cheap. But this sensor has a problem of low resolution. To solve the problem this paper proposes speed control by using a least square algorithm.

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Performance Enhancement of a Sensorless Drive for Brushless DC Motor Using Digital Filter (디지틀 필터를 이용한 브러시리스 직류 전동기용 센서리스 드라이브의 성능 향상에 관한 연구)

  • Yeo, H.G.;Lee, K.W.;Park, J.B.;Kim, T.H.;Lee, I.H.;Yoo, J.Y.
    • Proceedings of the KIEE Conference
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    • 1997.11a
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    • pp.490-492
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    • 1997
  • This paper describes a digital sensorless drive of permanent magnet brushless DC (PM BLDC) motors. The sensorless drive adopts a digital filter - moving average finite impulse response filter for accurate estimation of commutation time. Experimental results show that the performance of the proposed sensorless drive is superior to that of the sensorless drive without filtering.

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Simplified Design and Optimization of Slotless Brushless DC Machine for Micro-Satellites Electro-Mechanical Batteries

  • Abdi, Babak;Bahrami, Hamid;Mirtalaei, S.M.M.
    • Journal of Electrical Engineering and Technology
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    • v.8 no.1
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    • pp.124-129
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    • 2013
  • Electro-Mechanical Batteries have important advantages compared with chemical batteries, especially in Low Earth Orbit satellites applications. High speed, slotless, external rotor, brushless DC machines are proposed and used in these systems as Motor/Generator. A simplified analytic design method is given for this type of machines and, the optimization of machine in order to have maximum efficiency and minimum volume and weight are given in this paper. Particle swarm optimization (PSO) is used as the optimization algorithm and the finite element-based simulations are used to confirm the design and optimization process and show less than 6% error in parametric design.

CURRENT CONTROL ALGORITHM TO REDUCE TORQUE RIPPLE IN BRUSHLESS DC MOTORS

  • Lee, Kwang-Woon;Park, Jung-Bae;Yeo, Hyeong-Gee;Yoo, Ji-Yoon;Jo, Hyun-Min
    • Proceedings of the KIPE Conference
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    • 1998.10a
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    • pp.380-385
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    • 1998
  • This paper proposes a current control algorithm to reduce the torque ripple to commutation in unipolar PWM inverter-fed trapezoidal brushless dc motor drives. In this paper, we analyze the average voltage variation of the conducting phase due to commutation, and design a current controller to compensate for the average voltage variation. The proposed method predicts the duration of commutation to reduce the torque ripple due to over-compensation. Experimental results are presented that validate the proposed method.

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A Study on the Torque Ripple Reduction in Brushless DC Motors using Disturbance-Observer Controller (BLDC 모터의 토크리플을 줄이기 위한 외란 관측기 기반 제어기 설계에 관한 연구)

  • Jang, So-Hyun;Jo, Nam-Hoon
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.64 no.8
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    • pp.1217-1223
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    • 2015
  • In this paper, we study the problem of torque ripple minimization in Brushless DC Motors (BLDC) and proposes a disturbance observer (DOB) based controller in order to efficiently reduce the torque ripple. In the DOB based control system, an equivalent disturbance (plant disturbance and effect of modelling error) is cancelled by its estimate. When the DOB controller is applied to BLDC motors, the effect of inverter switching is considered as an equivalent disturbance and to be cancelled by the DOB controller. Through computer simulations, it is shown that the performance of the proposed DOB controller is superior to that of the conventional PI controller. In the case where the numerical values of resistance and inductance are not known exactly, it is shown that the proposed DOB controller achieves better performance than the PI controller.