• Title/Summary/Keyword: Brushless DC motors

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characteristics of a sensorless brushless motor (센서가 없는 브러쉬레스 전동기의 특성)

  • Park, C.S.;Yoon, S.H.;Kim, Y.S.
    • Proceedings of the KIEE Conference
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    • 1999.07a
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    • pp.385-387
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    • 1999
  • Brushless DC Motors are widely used because of their high power ratio and easy control. But the brushless DC Motors need rotor Position- and speed- sensor such as encoder, resolver and hall sensor. The position sensor has present several disadvantages from the standpoint of drive cost, machine size and reliability. Hall sensors are used generally because of low cost but their operating temperature is limited up to $75^{\circ}C$ because of sensitivity of temperature. Now a day many research projects are on the development of sensorless brushless DC motors to correct these disadvantages. In this paper, characteristics such as starting, change of speed and load of a sensorless brushless DC motor are investigated.

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Feedback Linearzing Control of Brushless DC Motors (일반적인 형태의 역기전력을 갖는 브러쉬 업는 직류 전동기의 궤환 선형화 제어)

  • 강창익;하인중;송중환
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.43 no.6
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    • pp.982-990
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    • 1994
  • In this paper, we consider feedback-kinearizing control of brushless dc motors which have been increasingly used in high-performance servo applications, We completely characterize the whole class of the feedback controllers that enable the brushless dc motors to behave like linear systems but without torque ripple. The whole class of the feedback-linearizing controllers is characterized in the explicit form which contains a function to be chosen freely. The previously known controllers correspond to either the particular ones in our whole class of the feedback-Linearzing controllers or their truncated Fourier expansions. This free function can be used to achieve other control objectives as well as linear dynamic characteristics. Furthermore, our feedback-linearizing controllers can be easily determined from the measurement data of back EMF.

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A study on the Development of Sensorless Driver for Electric Compressor Brushless DC Motor (전동식 컴프레서 브러시리스 직류 전동기용 센서리스 드라이브 개발에 관한 연구)

  • Cho, Jung-Hun;Park, Sung-Jun
    • Proceedings of the KIPE Conference
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    • 2019.07a
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    • pp.374-375
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    • 2019
  • In this paper, In the whole industry, there is a tendency to replace brushless motors with brushless motors because of the high rate of failure in DC motors with brushes. Accordingly, many methods for driving a brushless motor have been developed and studied. In order to drive the brushless motor, it is essential to know the information about the rotor position of the motor. However, it is not possible to use a position sensor for rotor disconnection due to the structure of an electric compressor brushless DC motor. In this paper, we investigate the rotor position of the motor by using the counter electromotive force included in the voltage of the terminal made by Y connection by using the resistance of each phase without using Hall sensor or encoder generally used to detect the rotor position. A sensorless drive system for a square wave brushless direct current (DC) motor is proposed. To do this, we propose a method to detect the rotor position from the analyzed terminal voltage waveform by performing terminal voltage analysis of each phase for 3-phase, 2-exciton unipolar PWM.

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Acoustic Noise and Vibration Reduction of Coreless Brushless DC Motors with an Air Dynamic Bearing

  • Yang, lee-Woo;Kim, Young-Seok;Kim, Sang-Uk
    • Journal of Electrical Engineering and Technology
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    • v.4 no.2
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    • pp.255-265
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    • 2009
  • 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 $120^{\circ}$ 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 core-less 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 $180^{\circ}$ 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.

Reduction of Electromagnetic Torque Ripple in High-Speed, High-Load Brushless DC Motors used for Automobile Parts (자동차 부품용 고속, 고부하 BLDC 모터내의 전자기적 토크 맥동 저감)

  • 황상문
    • Transactions of the Korean Society of Automotive Engineers
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    • v.6 no.4
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    • pp.39-46
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    • 1998
  • For permanent magnet brushless DC motors used for high speed fuel pumps, torque ripple is an important origin of vibration, acoustic noise and speed fluctuation. In this paper, the output torque profile of a PM motor with one phase energized is decomposed into the commutation torque, the reluctance torque and the armature reaction torque according to their source origins. It verifies that the output torque profile is qualitatively equivalent to the BEMF profile for low reluctance motors. This paper discusses the effect of magnet pole shaping and magnet arc length on the output torque and torque ripple. A magnet edge shaping is proposed to design a trapezoidal BEMF motor without torque ripple, with minimal sacrifice of the maximum output torque.

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Adaptive Fuzzy Sliding Mode Control of Brushless DC Motor (브러시리스 DC 모터의 적응퍼지 슬라이딩 모드 제어)

  • Lee, Jong-Ho;Kim, Sung-Tae;Kim, Young-Tas
    • Proceedings of the KIEE Conference
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    • 2000.11d
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    • pp.647-649
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    • 2000
  • Brushless DC motors are widely used in many industrial fields as an actuator of robot and driving power motors of electrical vehicle. In this paper adaptive fuzzy sliding mode scheme is developed for velocity control of brushless DC motor. The proposed scheme does not require an accurate dynamic model. yet it guarantees asymptotic trajectory tracking despite torque variations. Numerical simulation and DSP-based experimental works for velocity control of brushless DC motor are carried out.

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Analysis of the Acoustic Noise Characteristics by Controlling Lead Angle in Brushless DC Motors (진상각 제어에 따른 BLDC 전동기의 소음 특성 해석)

  • 황상문;김경태;정승규
    • Journal of the Korean Society for Precision Engineering
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    • v.17 no.1
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    • pp.101-109
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    • 2000
  • Mutual torque ripple in a brushless DC motor is the main source of acoustic noise, especially fur motor operation with high speed and torque. This paper presents a method to obtain mutual torque ripple to identify acoustic noise source. Mutual torque ripple can be determined by analyzing phase current shape and magnetic circuit with different lead angles. Current shape is determined by state space model of voltage equation with the use of inductance calculated by FEM, and confirmed by experimental results. Mutual torque ripple is also determined by FEM analysis for the calculated current shape. Acoustic noise experiment reveals that mutual torque ripple with different lead angle is one of the main sources for noise generation in a brushless DC motor.

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Study on BLDC (Brushless DC) Motor Position Detection by Adding Signal Brush (Signal Brush를 적용한 BLDC(Brushless DC) 모터 위치 검출)

  • Young Pil Kim;Si Kyung Kim
    • Journal of the Semiconductor & Display Technology
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    • v.23 no.1
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    • pp.48-51
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    • 2024
  • Recently, high-performance BLDC(Brushless DC) motors are being applied to various fields such as industrial and personal mobility devices and drones. To achieve the best performance of BLDC, sensors such as hall sensors, encoders, and resolvers are used to determine the position of the rotor, and various speed control technologies are being developed. However, due to problems with high-speed control due to external environmental factors and frequency bandwidth of semiconductor sensing devices, research on BLDC motors without semiconductor sensing devices is in progress. Therefore, in this study, a signal brush was added to the end of the rotor of a BLDC motor and the rotor position of the BLDC motor was detected by analyzing the signal output through the signal brush.

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State of the Art on Permanent Magnet Brushless DC Motor Drives

  • Singh, Bhim;Singh, Sanjeev
    • Journal of Power Electronics
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    • v.9 no.1
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    • pp.1-17
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    • 2009
  • Permanent magnet brushless DC (PMBLDC) motors are the latest choice of researchers due to their high efficiency, silent operation, compact size, high reliability and low maintenance requirements. These motors are preferred for numerous applications; however, most of them require sensorless control of these motors. The operation of PMBLDC motors requires rotor-position sensing for controlling the winding currents. The sensorless control would need estimation of rotor position from the voltage and current signals, which are easily sensed. This paper presents state of the art PMBLDC motor drives with an emphasis on sensorless control of these motors.

Development of a Sensorless Drive for Interior Permanent Magnet Brushless DC Motors (영구자석 매입형 브러시리스 직류 전동기용 센서리스 드라이브 개발에 관한 연구)

  • 여형기;홍창석;이광운;박정배;유지윤
    • The Transactions of the Korean Institute of Power Electronics
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    • v.2 no.3
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    • pp.44-50
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    • 1997
  • This paper describes an indirect sensing method for the rotor flux position of interior permanent magnet (IPM) brushless DC motors. The phase inductances of an IPM motor vary appreciably according to the rotor position. The waveform characteristics of the terminal voltage of IPM brushless DC motors is analysed and a simple and practical method for indirect sensing of the rotor position is proposed. A compact and economical sensorless drive is implemented and tested using a 87c196mc 16-bit one-chip microprocessor. The experimental results show the validity of the proposed method. The drive is applied to drive a compressor of air-conditioner and works well from 1,200 to 6,600 [rpm].

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