• The Transactions of the Korean Institute of Power Electronics
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• v.3 no.3
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• pp.191-198
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• 1998

This paper presents a new current control method to reduce the torque ripple due to phase commutation, when the unipolar PWM method is applied for the phase current control of brushless DC motor. Phase commutation bring about an instantaneous change in the average voltage of conducting phase so that current undulates, and this undulating current generates torque ripple. In this paper, we analyze average voltage variations of conducting phase in commutation period with PWM pattern and design current controller to compensate average variations. In addition, we prove the validity of proposed method by experimental results.

• Proceedings of the KIPE Conference
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• 2012.07a
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• pp.600-603
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• 2012

본 논문은 최근 친환경 차량인 EV & HEV의 전장품에 운전 효율 및 연비를 극대화하기 위해 브러시리스 직류 (Brushless DC) 전동기 및 Sensorless Drive를 적용시키는 사례가 증가하고 있다. 특히 전 세계적으로 환경오염의 주범이 되고 있는 차량의 이산화 탄소 배출량 규제, 계속된 유가상승 등에 따라 가장 밀접하게 연관되어 있는 자동차 전장품에 전동화를 통한 연비향상을 적극적으로 추진하고 있다. 본 논문에서는 차량의 전장 제품으로 다양하게 적용되고 있는 에어컨 압축기로 냉방용 컴프레서에 브러시리스 직류전동기 및 Sensorless 제어기를 적용 에어컨 컴프레서를 개발 하여 20CC 전동식 스크롤 컴프레서에 적용하여 실험하였다. 이러한 실험으로 제품의 운전 효율 증대시킴은 물론 우월한 압축 성능을 가져 옴으로써 차량용 에어컨 컴프레서의 고효율 전동화를 유도 시킬 수 있음을 확인 할 수 있었다.

• Proceedings of the KIPE Conference
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• 1998.07a
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• pp.342-346
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• 1998

The brushless DC motor with trapezoidal back emfs has torque ripple due to phase commutation. The torque ripple generates noise and vibration and cause errors in position control so this makes the brushless DC motor less suitable for high performance servo applications. In this paper, we propose a new current control method to reduce the torque ripple due to commutation, when the unipolar PWM method is applied for the phase current control of brushless DC motor.

• Proceedings of the KIEE Conference
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• 2005.07b
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• pp.1300-1302
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• 2005

Slotless brushless dc motor with 돗 characteristics of high speed and power density has been more widely used in industrial and factory machine. This paper deals with the dymanic simulation and test results of slotless type high-speed brushless DC(BLDC) motor. The mathmatical model of the BLDC motor is presented with the analytical solution of back EMF constant. And, the controller is implemented using a TMS320F2812 DSP-based system with power conversion circuit.

• Proceedings of the IEEK Conference
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• 1998.06a
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• pp.203-206
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• 1998

This paper describes the procedure of getting information about auto-tuning of PID regulator by the injection of high step input, called limited input, during a transient time of control. The key point is that system identification and control could be continuously executed. This means that the system information obtained by limited input despite of system uncertainty can be continuously applied to the PI regulator. Simulation and experiment result of brushless DC motor system having monotone increasing step response demonstrate the usefulness of proposed auto-tuning algorithm.

• Proceedings of the KIEE Conference
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• 1987.11a
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• pp.49-52
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• 1987

In this work, the characteristics of a six step inverter fed brushless DC motor are analyzed and the control of amplitude of inverter input voltage and phase shift of a six step inverter is discussed. The effects of the motor performance, efficiency and power factor, are studied.

• The Transactions of the Korean Institute of Power Electronics
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• v.21 no.5
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• pp.449-452
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• 2016

This paper presents a simplified analysis on the rotor position detection error in sensorless interior permanent magnet brushless DC motor (BLDCM) drives, wherein terminal voltage sensing based on the back-electromotive force (back-EMF) zero-crossing point detecting circuitry is employed. The effect of a rotor saliency on the back-EMF's zero-crossing point detection is analyzed using the extended EMF-based voltage equation of the interior permanent BLDCM in a stationary reference frame, and thus the overall analysis is considerably simplified compared to the conventional one. Simulation results are provided to verify the effectiveness of the proposed method.

• Proceedings of the KIPE Conference
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• 2002.07a
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• pp.110-114
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• 2002

Generally, brushless DC motor(BLDCM) driving system uses hall sensors or encoders as the mechanical position or speed sensors. It is necessary to achieve the informations of rotor position for driving trapezoidal type brushless DC motor without any position sensor. This paper proposes a sensorless driving system with rotor absolute position detector circuit which acquires both commutate phase and commutate time by analyzing motor phase voltages. Proposed system is applied to a 10k[W] rating motor which actually used in electrical vehicles of HONDA co.,ltd. The experimental results will show the validity of the proposed system and the practical use of proposed sensorless drive algorithm.

• Proceedings of the KIPE Conference
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• 2002.07a
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• pp.124-128
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• 2002

This Paper propose a novel sensorless drive system for the trapezoidal brushless DC motor in Bow speed region. The inverter DC input voltage is controlled by step-down converter for low speed operation. A indirect rotor position sensing technique based on a detailed analysis of the terminal voltage characterisrics is proposed in this paper. A sensorless drive system is implemented using a TMS320F240 for the main process and IPM(Intelligent Power Module) for the inverter.

• The Transactions of the Korean Institute of Power Electronics
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• v.9 no.5
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• pp.491-497
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• 2004

This paper presents a new rotor position estimation method for brushless DC motors. It is clear that the estimation error of the rotor position provokes the phase shift angle misaligned between the phase current and the back-EMF waveforms, which causes torque ripple in brushless DC motor drives. Such an estimation error can be reduced with the help of the proposed neutral voltage-based estimation method that is structured in the form of a closed loop observer. A neutral voltage appearing during the normal mode of the inverter operation is found to be an observable and controllable measure, which can be dealt with for estimating an exact rotor position. This neutral voltage is obtained from the DC-link current, the switching logic, and the motor speed values. The proposed algorithm, which can be implemented easily by using a single DC-link current and the motor terminal voltage sensors, is verified by simulation and experiment results.