• Title/Summary/Keyword: Trapezoidal back-EMF

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Topology Design of BLDC Motor for Cogging Torque Reduction and Characteristic Analysis (코깅토크 저감을 위한 BLDC 전동기의 형상 설계 및 특성 분석)

  • Seo, Kyung-Sik;Jung, Sang-Yong;Lee, Cheol-Gyun
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.63 no.11
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    • pp.1519-1525
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    • 2014
  • This paper presents the shape design for reducing cogging torque and characteristic analysis in Brushless DC (BLDC) motor. In this BLDC motor, ${\Delta}$(delta)-winding is applied, and in order to obtain the $60^{\circ}$ trapezoidal phase back-EMF waveform, permanent magnet shape design is carried out. And then, a method on specifying design parameters to effectively reduce cogging torque is developed. back-EMF, input voltage and input current which are analyzed by the Finite Element Method (FEM) are validated by experimental results. Also, efficiency calculations based on analysis and experimental results are performed and analyzed.

A Simple Fault Correction Method for Rotor Position Detection of Brushless DC Motor using a Latch Type Hall Effect Sensor

  • Baik In-Cheol;Joo Hyeong-Gil
    • Journal of Power Electronics
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    • v.5 no.1
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    • pp.62-66
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    • 2005
  • A simple fault correction method for rotor position detection of a brushless DC(BLDC) motor with trapezoidal back EMF(electromotive force) using a Hall effect latch unit is presented. The reason why the Hall effect latch unit does not operate properly during the startup of a BLDC motor is thoroughly explained. To solve this problem, a simple code change method and its hardware implementation issues are proposed and discussed.

A Study on Power Delivery of BLDCM with Change of Conduction Intervals (브러시리스 직류 전동기의 통전각 변화에 따른 에너지 전달에 관한 연구)

  • Kim J.S.;Kang Y.J.;Yoo J.Y.
    • Proceedings of the KIPE Conference
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    • 2003.07a
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    • pp.477-480
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    • 2003
  • Generally, 2 phase excited brushless DC motor(BLDCM) operates only in the region of constant trapezoidal back-EMF on each phase. Therefore the efficiency decreases in comparison with 3phase excited BLDCM. This paper proposes the relation between the usage ratio of voltage and the change of fewer delivery of BLDCM according to extension of conduction intervals.

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An Improvement of Sensorless Driving Performance for Brushless DC Motor with Trapezoidal Back EMF (제형파 역기전역을 갖는 브러시리스 DC모터의 센서리스 운전특성 향상)

  • Woo, Hyuk-J.;Song, Myung-H.;Park, Kyu-N.
    • Proceedings of the KIEE Conference
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    • 2001.07b
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    • pp.1138-1140
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    • 2001
  • 본 논문은 BLDCM의 센서리스 운전에 관한 것으로 운전속도에 따라 인버터 스위칭 주파수를 적절히 가변함으로서 넓은 속도범위에 서 운전성능과 효율을 개선시켜 센서리스 운전을 향상시킬 수 있는 방법을 제시하였으며 실험을 통하여 유용성을 입증하였다.

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A Commutation Strategy for Torque Ripple Reduction of Sensorless Drive for BLDC for BLDC Motors (BLDC 전동기용 센서리스 드라이브의 토크 리플 저감을 위한 전유 방법)

  • 여형기;김태형;박정배;이광운;유지윤
    • Proceedings of the KIPE Conference
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    • 1998.07a
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    • pp.337-341
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    • 1998
  • Brushless DC motors have trapezoidal back emf waveform. Generally, because it is drived by a voltage source inverter, the ideal rectangular phase current is not available and therefore produce torque ripple. In this paper, the torque ripple due to commutation is analysed and the practical method that can reduce the torque ripple is proposed. Simulation and experimental results show the effectiveness of the proposed method.

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An Improved Torque Ripple Minimization of Brushless DC Motor (개선된 Brushless DC Motor의 토크리플 최소화)

  • Chung, Jin-Hwa;Chung, Sun-Tae
    • Proceedings of the KIEE Conference
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    • 1994.07a
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    • pp.298-302
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    • 1994
  • Brushless DC motors have a trapezoidal back EMF wave form and are fed with rectangular stator currents. Under these conditions, the torque produced is theoretcally constant. However, in practice, torque ripple may exist, one major cause of which conies from phase current commutation. In this paper we propose an improved method of reducing the torque ripple due to phase current commutation of indirectly restricting the uncommutated current through control of the other phase currents. Simulation results are present.

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A Direct Torque Control System for Improving Speed Response of Five-Phase Induction Motor (5상 유도전동기의 속도응답특성 개선을 위한 직접토크제어 시스템)

  • Kim, Min-Huei;Choi, Sung-Un
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.26 no.1
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    • pp.66-74
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    • 2012
  • This paper propose a improved direct torque control(DTC) system for improving operation of five-phase squirrel-cage induction motor(IM). A five-phase IM drives present unique characteristics due to the additional degrees of freedom and also drives possess many others advantage compared with the traditional three-phase motor drive system, such as reducing a amplitude of torque pulsation and increasing the reliability. In order to maximize the torque per ampere, the proposed motor has concentrated windings and the produced back-electromotive force(EMF) is almost trapezoidal, and the motor is supplied with the combined sinusoidal plus third harmonic of currents, there is necessary to controlled 3rd harmonic current. Also a DTC method is advantageous when it is applied to the five-phase IM, because the five-phase inverter provides 32 space vectors in comparison to 8 space voltage vectors into the three-phase inverter drive system. For presenting the superior performance of the proposed DTC, experimental results of speed control are presented using a 32-bit fixed point TMS320F2812 DSP with 1.5[hp] IM.

BLDC Motor Model with Non-Linear Back-EMF Wave (비선형 역기전력 파형을 고려한 BLDC 모터 모델)

  • 이상용;강병희;채영민;목형수;최규하;김덕근;류재성
    • Proceedings of the KIPE Conference
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    • 1999.07a
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    • pp.22-25
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    • 1999
  • A brushless DC motor has the high quality of torque output and silence, has been more widely used in industrial area. As the driver and controller of BLDC motor have been more complicated and precise, simulation method has been much used in motor design. And the output characteristics of BLDC motor is determined by the waveform of BACK-KMF in instinct. But because the conventional model of BLDC motor is obtained by approximation of real nonlinear waveform to ideal trapezoidal waveform, the error is occurred in simulation result. Thus in this paper, for the correction of this error in simulation, the model of real nonlinear waveform considered is proposed, and the simulation result is obtained in case of three-phase, four-poles Y-connected, surface mounted permanent magnet BLDC motor.

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A Commutations Strategy for Torque Ripple Reduction of Sensorless Drive for Brushless DC Motors (BLDC 전동기용 센서리스 드라이브의 토크 리플 저감을 위한 전환 방법에 관한 연구)

  • 여형기;김태형;이광운;박정배;유지윤
    • The Transactions of the Korean Institute of Power Electronics
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    • v.3 no.3
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    • pp.199-205
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    • 1998
  • Brushless DC motors have trapezoidal back-EMF waveform. Theoretically it should be fed with rectangular phase current in order to produce torque ripple free. Because it is drived by a voltage source inverter, perfect rectangular phase current can not available and therefore produce torque ripple. In this paper, the torque ripple due to commutation is analyzed and the practical method that can reduce the torque ripple is proposed. Experimental and simulation results show the effectiveness of the proposed method.

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A Simulation Model of Brushless DC Motor with Rectangular Current Excitation (구형파 전류여자 브러시리스 직류전동기의 시뮬레이션 모델)

  • Kim Jong-Sun;O Won-Hyun;Shin Eun-Chul;Yoo Ji-Yoon;Lee Kwang-Woon
    • Proceedings of the KIPE Conference
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    • 2002.07a
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    • pp.443-446
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    • 2002
  • Brushless DC motor(BLDCM) are suitable to operate in a wide speed range, easy to control and since there are no mechanical brushes and commutators, require low maintenance costs and are free from restrictions of application environment. And since the ratio of instantaneous torque and rated torque is high, BLDCM are appropriate for variable speed operation. This paper proposes the optimal model by using Matlab/simulink based on modelling and characteristic analysis of trapezoidal back EMF type BLDCM and verifies the validity of the proposed model by applying control systems.

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