• Title/Summary/Keyword: Brushless D.C. Motor

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A Study on the Improvement of Torque Characteristics of D.C Brushless Motor by Auxiliary Slot Method (보조 슬롯법에 의한 D.C Brushless Motor의 토오크특성 개선에 관한 연구)

  • Im, Dal-Ho;Kim, Saeng-Su;Son, Yung-Kyu
    • Proceedings of the KIEE Conference
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    • 1988.07a
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    • pp.83-86
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    • 1988
  • In all sorts of primary factor which produce torque ripple of d.c brushless motor cogging torque which is generated from relation between permanent magnet rotor and salient pole cannot controled by external control system. So in this paper cogging torque is analysed by simple method in which slot fuctuion is introduced. And for reducing counterplan of cogging torque d.c brushless motor which plot auxiliary slot by inequality interval is proposed. Thus the quantitative torque characteristics of new motor which designed by this method is analysed by F.E.M and validity of this new design is proved.

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The Development of Brushless Disk Type Motor for a Motorcar (자동차용 Brushless Disk Type Motor 개발연구)

  • Chang, K.C.;Park, C.S.;Park, S.C.
    • Proceedings of the KIEE Conference
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    • 1992.07b
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    • pp.620-622
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    • 1992
  • Magnetic characteristics of a brushless disk type motor has been analyzed taking into account the magnetization distribution in the rotor magnet. This paper describes a method for calculating the 3D flux density in the air gap and calculates the induced voltage of the windings and the torque betweens the permanent magnet and the amateur current.

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Multiple Simultaneous Specification Control of a High Speed Positioning System Driven by a Brushless D.C. Motor (브러시레스 직류 모터로 구동되는 고속 작동기의 다중 동시 사양 제어)

  • Kang Bong-Soo;Kim Soo-Hyun;Kwak Yoon-Keun
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.28 no.8 s.227
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    • pp.1093-1098
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    • 2004
  • This paper presents a close-loop feedback control scheme, which can simultaneously satisfy multiple conflicting control performances, for a high speed positioning system driven by a brushless D.C. motor. With the dynamic model of the motor and proportional-plus-derivative feedback controllers selected as sample controllers, the convex combined feedback controller is formulated for implementing a direct-drive manipulator. Experimental results show that the developed multiple simultaneous specification(MSS) controller can meet desired control performances; maximum overshoot and rise time.

A study on the characteristic improvement of BLDCM (브러쉬 없는 직류전동기의 성능개선에 관한 연구)

  • Kim, D.W.;Huh, U.Y.;Kwon, O.K.
    • Proceedings of the KIEE Conference
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    • 1989.11a
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    • pp.438-441
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    • 1989
  • In this paper the phase advance method is adopted for torque characteristics improvement of brushless D.C motor and the effect on motor characteristics is investigated. The optimal commutation position is calculated by computer simulation. This paper also implements a driver for brushless D.C motors using single-chip microprocessor, 8751.

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Analysis of Output Characteristic in accordance with Airgap Variation in Switched Reluctance Motor and Brushless DC Motor (Switched Reluctance Motor와 Brushless DC Motor의 공극 변화에 따른 출력 특성 비교)

  • Yoon, C.H.;Park, K.K.;Lee, J.C.;Chun, Y.D.;Lee, Ju
    • Proceedings of the KIEE Conference
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    • 2001.07b
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    • pp.843-845
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    • 2001
  • In this paper, we analyze the characteristics of electecromotive force(emf), phase current and torque according to the length of the air gap using 2nd order FEM(Finite Element Method) in Synchronous Reluctance Motor(SRH) and Brushless DC Motor(BLDC) with same volume and size. In the analysis with FEM, we applied the time-step function considering the motor switch in the magnetic vector potential of the unknown node.

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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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A Study on the Low Cogging Torque of Brushless DC Motor (브러시레스 D\ulcornerC 모터의 코깅 토오크 저감에 관한 연구)

  • 임달호;김생수
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.37 no.6
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    • pp.361-367
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    • 1988
  • In this study new design method with auxiliary slot on salient pole is proposed for the reduction of cogging torque which is the problem of corm type DC Brushless motor. And FEM(Finite element method) is adapted in trial motor which is designed by the method proposed in this paper. and learn the quantative characteristics of cogging torque. Comparing results of analysis with measurement it is porved that the proposed design has a propriety.

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The Modelling and Characteristic Analysis of Brushless Synchronous Motor with Sinusoidal back EMF (정현파 역기전력 특성을 갖는 브러시리스 동기전동기의 모델링 및 특성해석)

  • Kim, Il-Nam;Baek, Su-Hyeon;Kim, Cheol-Jin;Maeng, In-Jae;Yun, Sin-Yong
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.49 no.6
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    • pp.380-386
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    • 2000
  • This paper presents the mathematical modelling analysis of Brushless Synchronous Motor(BLSM). The dynamic and the steady state characteristics of BLSM are simulated and analyzed : electromagnetic torque, speed, line voltage, and current. We used mathematical modelling to model of BLSM with sinusoidal back EMF, namely the shaft transformation referencing rotor frame from a, b, c three to produce constant torque like synchronous motor. The experiment result has already similar to compare with simulation result : torque error about 7%, speed error about 5%. The validity of proposed modelling and analysis was confirmed by the experimental result.

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The Analysis of Dynamic Characteristics and Modeling of Brushless DC Motor (브러시리스 DC 모터의 모델링과 동특성 해석)

  • Choi, B.I.;Baek, S.H.;Kim, Y.;Yun, S.Y.;Im, T.B.;Kim, C.J.
    • Proceedings of the KIEE Conference
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    • 1998.07a
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    • pp.200-204
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    • 1998
  • In this paper, a mathematical model of Brushless DC machine fed by pwm inverter is developed. Dynamic and steady state characteristics of Brushless DC motor is simulated and analyzed: electromagnetic torque, speed, phase voltage, and current. In mathematical modeling, the shaft transformation referencing rotor frame from to "a,b,c" three phase frame to "d,g" two phase frame is described.

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Shape Design of Switched Reluctance Motor for 10kW type Pallect Truck (10KW급 지게차량용 스위치드 릴럭턴스 전동기의 형상 설계)

  • Lee, Jin-Woo;Woo, Kyung-Il;Kim, Hong-Seok;Kwon, Byung-Il
    • Proceedings of the KIEE Conference
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    • 2002.04a
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    • pp.55-57
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    • 2002
  • In industry, A pallet truck is drived mainly by d.c motor, because it use to battery for input power. However, d.c motor has a brush, this is the disadvantage of the d.c motor for a pallet truck. Though a brushless d.c motor has a permanent magnet, it is for low torque. Switched reluctance motors(SRM) have the advantage a high torque/weight ratio, as the large reluctance torque is made by salient poles of both start and rotor, and a high reliability, this paper design the shape of the switched reluctance motor that will replace a d.c motor for A pallet truck. First of all, designed parameter of SRM, outer diameter, diameter of rotor and stock length, from the outputr equation considering electric loading and magnetic loading. Next, design diameter of stator and rotor, depth of slot pole width, air gap as inner size of motor. The design of SRM certify the torque, the efficiency and the output power by a simulation.

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