• Title/Summary/Keyword: Permanent Magnet Brushless DC Motors

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The Design of High-power BLDC Motor with Maximum Torque at Low Speed for Ship Propulsion (선박 추진 장치를 위한 저속영역에서 최대토크를 가지는 고출력 BLDC 모터의 설계)

  • Cho, Seung-Hyun;Bin, Jae-Gu;Cho, Soo-Eok;Choi, Chul;Kim, Chul-Woo
    • The Transactions of the Korean Institute of Power Electronics
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    • v.9 no.2
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    • pp.112-118
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    • 2004
  • Recently, development of rare earth permanent magnet with the high remanence, high coercivity allows the design of brushless motors with very high efficiency over a wide speed range. Cogging torque is produced in a permanent magnet by magnetic attraction between the rotor mounted permanent magnet and the stator teeth. It is an undesired effect that contributes to output ripple, vibration, and noise of machine. This cogging torque can be reduced by variation of magnet arc length, airgap length, magnet thickness, shifting the magnetic pole and varying the radial shoe depth and etc. In this paper, some airgap length and magnet arc that reduce cogging torque are found by finite element method(FEM) and Maxwell stress tensor method. The SPM(Surface Permanent Magnet) type of high-power Brushless DC (BLDC) motor is optimized as a sample model.

A Study on the Effect of the Magnetization Direction on the Iron Loss Characteristics in Brushless DC Motors

  • Jung, Jin-Woo;Kim, Tae-Heoung
    • Journal of Magnetics
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    • v.15 no.1
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    • pp.40-44
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    • 2010
  • This paper introduces two types of magnetization, and reports the effect of the magnetization direction on the iron loss in a brushless DC (BLDC) motor using a 2-D time-stepped voltage source finite-element method (FEM). The iron losses were found to consist of hysteresis and eddy current loss, which were calculated from the time variation of the magnetic field distribution. To confirm the analysis, a prototype BLDC motor was constructed with a sintered ferrite magnet. The analysis and experimental results suggest that the magnetization direction has a significant effect in terms of the iron loss characteristics of the BLDC motor.

BLDC Motor Control Algorithm for Industrial Applications Using a General Purpose Processor

  • Kim, Nam-Hun;Yang, Oh;Kim, Min-Huei
    • Journal of Power Electronics
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    • v.7 no.2
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    • pp.132-139
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    • 2007
  • Electrical motors are an integral part of industrial plants with no less than 5 billion motors built world wide every year. The demand for low-cost brushless DC (BLDC) motors has increased in industrial applications. This paper presents a BLDC motor control algorithm for low-cost motor drive applications using general purpose microcontrollers which have only one on-chip timer. This paper describes how to realize pulse width modulation (PWM) signals with general input/output (I/O) ports to control a three-phase permanent magnet brushless DC motor using the timer interrupt on MSP430F1232.

Design and Implementation of integrated drive circuit for a small BLDG Motor (드라이브 내장형 소형 BLDC 모터의 설계와 구현)

  • Choi, J.H.;Lee, J.B.;Rhyu, S.H.;Chung, J.K.;Sung, H.G.
    • Proceedings of the KIEE Conference
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    • 2003.04a
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    • pp.170-172
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    • 2003
  • Among low power servo applications, classical DC motors are very popular because they are reasonably cheap and easy to control. The main disadvantage is the mechanical collector which has only a limited life period. Also, brush sparking can destroy the rotor coil, generate EMC problems. So permanent magnet brushless do motors and drives are being used increasingly in a wide range of applications. This has been made possible with the advantages of high performance permanent magnets with high coercively and residual magnetic, which make it possible for the PM to have superior power density, torque to inertia ratio and efficiency, when compared to an induction or conventional dc machine. This paper presents the design of a PM brushless dc motor drive simplistically operates as a classical dc motor. The BLDC motor drive system for this paper composes to the power integrated circuits, the one chip device. And several simple semiconductors add to drive system for a motor drive system simplistically operates as a conventional dc motor. Test results confirmed the feasibility of the proposed motor drive system design.

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The Characteristics of Noise and Vibration by Asymmetrical Overhang Effect of Permanent Magnet in BLDC Motor (BLDC Motor의 비대칭 오버행 효과에 의한 소음 및 진동 특성)

  • An, Young-Gyu;Kang, Gyu-Hong;Kim, Gyu-Tak
    • Proceedings of the KIEE Conference
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    • 2006.04b
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    • pp.109-111
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    • 2006
  • This paper deals with a noise and vibration of brushless dc (BLDC) motors due to the asymmetrical overhang of permanent magnet. The asymmetrical overhang of permanent magnet is generating z-axis thrust which is lead to eccentric force and vibration of BLDC motor. The z-axis thrust considering asymmetrical overhang effect of permanent magnet is analyzed by using 3-D FEM and the result is compared to experimentation.

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A Novel Asymmetrical Half-type IPM BLDC Motor Structure for Reducing Torque Ripple (토크 리플 저감을 위한 새로운 비대칭 하프-타입 영구자석 매입형 브러시리스 직류 모터 구조)

  • Sim, Yosub;Niguchi, Noboru;Hirata, Katsuhiro
    • The Transactions of the Korean Institute of Power Electronics
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    • v.21 no.2
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    • pp.134-143
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    • 2016
  • This paper proposes a novel asymmetrical interior permanent magnet (IPM) brushless DC (BLDC) motor structure, which utilizes half-type permanent magnet (PM) configuration and has asymmetrical side gaps (slot next to the PMs) for reducing torque ripples. This structure uses 24% less volume of PMs than conventional IPM BLDC motor with a full set of magnets. The characteristics of the proposed motor are compared with three other half-type IPM BLDC motors through finite elements method (FEM) analysis, and the usefulness of the proposed motor was verified through experimental evaluation on prototypes of the conventional motor and proposed motor under various torque load conditions. This research obtained a high-performance IPM BLDC motor while decreasing manufacturing cost at the same time.

A STUDY ON OPTIMAL DRIVING METHODS FOR IMPROVING TORQUB CHARACTERISTIC OF MINIATURE BRUSHLESS DC MOTOR (소형브러시리스 DC 전동기의 토크 특성향상을 위한 최적 구동법에 관한 연구)

  • Park, G.T.;Song, M.H.;Kim, Y.I.
    • Proceedings of the KIEE Conference
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    • 1989.07a
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    • pp.16-20
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    • 1989
  • In this paper, we describe the optimal driving method and magnetic flux distribution of permanent magnet which enhance torque characteristics in small-sized 3-phase brushless DC motors. The disadvantages of conventional $120^{\circ}$ constant current drive method are torque ripple, switching noise and spike voltage due to the inductance of stator coil. This shortcommings can be avoided by the switching slew-rate of driving current which is called linear voltage driving method. The aim of this study is to analyze linear voltage driving method quantatively and to determine optimal drive current waveform through computer simulation. The selection of commutation angle and slew rate of a new driving current at switching instants makes torque ripple index minimize and average torque maximize. And the validity of this new driving method was assured by Fourier analysis. Considering two dimensional nonlinear magnetic flux distribution on the permanent magnet, we suggest optimal flux distribution according to the presented driving method which improves torque characteristics.

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INDUCTION SERVOMOTOR AS CONTROL COMPONENTS (제어소자로서의 유도 서보 전동기)

  • Lee, Kun-Yong;Pauly, D.
    • Proceedings of the KIEE Conference
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    • 1988.07a
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    • pp.61-64
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    • 1988
  • This paper deals with some aspects for the design of induction servomotors with respect to permanent magnet servomotors and standard induction motors as control components. Induction servomotors have much lower weight and moment of inertia than the DC servomotor but cannot reach the excellent values of a brushless DC servomotor with rare earth magnets.

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Dynamic Analysis Algorithm of Irreversible Demagnetization of IPM-type Brushless DC Motor by Stator Turn Fault (고정자 절연파괴 고장에 의한 매입형 영구자석 BLDC 모터의 불가역 감자에 대한 동적해석 알고리즘)

  • Lee, Yoon-Seok;Kim, Kyung-Tae;Hur, Jin
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.62 no.12
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    • pp.1661-1667
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    • 2013
  • This paper studies the dynamic irreversible demagnetization characteristics of an interior permanent magnet (PM) brushless DC motor with a stator turn fault. A new algorithm, which is a finite element method (FEM) combined with a line voltage equation of the motor, is developed to analyze irreversible demagnetization under dynamic and transient states and considers a stator turn fault. The input current, circulating current, magnetic distribution characteristics, and operating property of the PM, including the irreversible demagnetization in the fault state, are analyzed using this algorithm by considering the magnetic saturation effect. The feasibility of the proposed method confirmed from the analysis results is verified via an experiment. Through this fault analysis, we can accurately check the fault phenomena of a PM motor against the demagnetization fault for fault prevention.

Design of a Switched Reluctance Motor Driving an Electric Compressor for HEVs (하이브리드 자동차(HEV) 용 전동식 컴프레서 구동을 위한 SRM 설계)

  • Jeong, Yong-Hoe;Jeon, Yong-Hee;Kang, Jun-Ho;Kim, Jaehyuck
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.62 no.5
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    • pp.620-625
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    • 2013
  • This paper presents the design of a switched reluctance motor (SRM) for electric air conditioning compressors which are applied to hybrid electric vehicles (EVs). The motor for driving air conditioning compressor which is recently used on EV(electric vehicle) / HEV (hybrid electric vehicle) is PMSM(permanent magnet synchronous motor) or BLDCM(brushless DC motor). However disadvantage of motors that uses permanent magnets are vulnerable to high temperatures because of the demagnetization by the high temperature and the permanent magnet is expensive because of the high price of rare earth materials from China's monopoly. Therefore, in the automotive insustry is interested in the non-rare-earth motors. SRM has many advantages. it's resistant to high temperatures, price is cheaper, because there are no permanent magnets and winding in the rotor. Also it's high relability and efficiency, suitable for high-speed operation because of structure is simple. In this paper, the SRM, non-rare-earth motor, are designed, analyzed and experimented drive to replace an existing electric compressor drive motor.