• Journal of Power Electronics
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• 제15권6호
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• pp.1559-1566
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• 2015

The brushless DC motor (BLDCM) has many advantages. As a result, it is widely used in electric vehicle (EV) drive systems. To improve the reliability of the motor control system, a position sensorless control strategy based on a sliding mode observer (SMO) is proposed. The global fast terminal sliding mode observer (GFTSMO) is proposed to enhance the control performance of the SMO control system. The advantages of the linear sliding mode and the nonsingular terminal sliding mode (NTSM) are combined in the control strategy. The convergence speed of the system state is enhanced. The motor commutation point is obtained with the observation of the back EMF, and the instantaneous torque value of the motor is calculated. Therefore, the position sensorless control of the BLDCM is realized. Experimental results show that the proposed control strategy can improve the convergence speed, dynamic characteristics and robustness of the system.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1991년도 하계학술대회 논문집
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• pp.615-618
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• 1991

In this paper deals with instantaneous torque control of induction motor by vector control. The induction motor is modelled from nonlinear to linearized in condition to its control by vector control method and we obtained simple model as like as a separately excited DC motor drive system. This paper presents the fully digital controlled induction motor drive system based on the proposed linearized method and the control circuit of system consists of 16bits micro computer and all the function are implemented with software.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2014년도 전력전자학술대회 논문집
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• pp.108-109
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• 2014

본 논문에서는 배터리, 양방향 DC-DC 컨버터, 그리고 브러시레스 직류 전동기로 구성되는 마이크로 터빈 구동 시스템의 제어 방식에 대해 소개한다. 브러시레스 직류 전동기 구동용 인버터의 직류링크 전압이 가변되기 때문에 기존의 소신호 모델 기반으로는 양방향 DC-DC 컨버터의 과도 응답 제어 성능이 저하되는 문제점이 있다. 본 논문에서는 평균 모델을 이용하여 양방향 DC-DC 컨버터를 제어함으로써 과도 응답 제어 성능을 개선하였고, PAM 방식 제어를 이용하여 브러시레스 직류 전동기의 고속 센서리스 운전을 구현하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 F
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• pp.2688-2690
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• 1999

This paper presents the modeling method of $3{\Phi}$ phase-controlled rectifier considering the overlap interval for the drive of DC motor in the Matlab environment. The model is constructed by the module-based method and therefore it is appropriate in the research of the closed-loop controlled power electronic system in the Matlab/Simulink environment. The model of SCR is used as the element for the power transformation. The simulation results show that the overlap interval from the effect of the input inductance is accurate.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1993년도 정기총회 및 추계학술대회 논문집 학회본부
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• pp.56-58
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• 1993

This report describes the high speed DC motor (8,000 rpm) that we have designed, manufactured and tested. DC motor is the best drive system in electric-mechanical energy conversion. The design concept for high speed and high energy density to DC motor is to maximize Ampere-conductor in armature and to maximize flux density in armature teeth, armature core, pole, yoke using flux path.

• 제어로봇시스템학회논문지
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• 제10권3호
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• pp.286-293
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• 2004

This paper presents the result of a study on the starter control for a turbo generator. Because a starter in gear box type turbo-generator system is composed of gearbox and brush DC motor, it should be replaced with High Speed Generator(HSG)) in HSG type Turbo-generator. There-ore, it is necessary to design a new starting algorithm and starter. In gearbox type system, brush DC motor is rotated to the designed speed using low voltage-high current battery power. After brush DC motor speed is increased to several times by gearbox, gas turbine engine can be rotated to designed starting speed. If we implement a starter with High Speed Generator(HSG), it is necessary to drive high-speed generator to high-speed motor. High-speed generator with permanent magnet on rotor has a low leakage inductance fur driving high-speed rotation, and it is necessary high DC link voltage for inverter when High-speed generator is driven to high speed. This paper presents result of development of the boost converter for converting high voltage DC from low battery voltage and design of the inverter for controlling a high frequency current to be injected to motor winding. Also, we show performance of the designed starter by driving the turbo generator.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1991년도 춘계학술대회 논문집
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• pp.158-165
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• 1991

DC servo motors have small torques compared to their weight. In order to reduce the speed and increase the output torque of the DC motor, a gear box is commonly used. The use of a gearbox, however, imposes limitations onmany applications because of the backlash and the reduction in transmission efficiency. Furthemore, the elastic deformation or the compliance of the gearbox decreases the accuracy of the servo mechanism and the stability of the system. In view of the many disadvantages in using the gearbox, a more effective solution has to be found. The solution is the direct drive mechanism. There are many kinds of direct drive motors. I will consider the ultrasonic motor in particular.

• Journal of international Conference on Electrical Machines and Systems
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• 제1권3호
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• pp.354-359
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• 2012

A transformerless converter suitable for multiphase drive application is presented in this paper. The topology employs a cascaded H-bridge rectifier as the interface between the grid and multi inverters which drive the multiphase motor. Compared with the conventional structure, the new topology eliminates the input transformer and also has the advantages such as four quadrant operation, simple configuration, low cost, high efficiency, and so on. The control strategies for the grid-side cascade H-bridge rectifier and the motor-side inverter are studied accordingly. Based on the multi-rotational reference frame, modular control scheme is developed to regulate the multiphase drive system. Simulation results show the proper operation of the proposed topology and the corresponding control strategy.

• 산업기술연구
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• 제22권B호
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• pp.125-132
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• 2002

In this paper, a high performance current control strategy for a Brushless DC Motor is presented. The proposed strategy is based on the ramp comparison PI current control with the predictive voltage compensation. The proposed strategy is compared with the hysteresis current control strategy. The proposed method can improve the current waveforms, and it can reduce the torque ripples. So the proposed strategy is suitable to a high performance current control strategy for a Brushless DC Motor. The simulation and experimental results for a laboratory Brushless DC motor drive system confirm the validity of the proposed strategy.

• 전력전자학회논문지
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• 제6권2호
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• pp.132-140
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• 2001

유니버셜모터는 소형의 직류 직권전동기와 같은 기계적 구조를 가지며 교류.직류 전원을 양용할 수 있는 장점으로 동급의 일반전동기에 비해 높은 속도로 구동이 가능하므로 핸드드릴이나 진공청소기, 세탁기 등의 가정용 기기 등에 일반적으로 사용된다. 위상각제어기를 이용하여 모터로 입력되는 전압을 제어하는 방법은 간단한 구조 때문에 위상지연으로 인해 입력 역률 및 저차 고조파 전류특성이 좋지 않음에도 불구하고 널리 사용되고 있다. 브리지 정류기를 사용하여 교류 전원을 맥동하는 직류 전원으로 변환한 후 DC 초퍼로써 유니버셜모터에 입력되는 평균전압을 제어하는 방법은 제어기의 효율을 높일 수 있고 저차 고조파전류를 감소시킬 뿐만 아니라 저전력값에 대해서도 부하역률의 저하를 막을 수 있다. 본 논문에서는 기존의 제어기의 방법으로 저가의 위상각 제어기를 구서하고 EH한 저가의 마이크로 컨트롤러를 이용한 DC 초퍼시스템을 각각 구성하여 저차 고조파전류 특성을 비교 분석하였다.