• Title/Summary/Keyword: High-speed permanent magnet motor

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Design and Analysis of Characteristics of Interior Permanent Magnet BLDC Motor That Consider Shape-Ratio of Permanent Magnet (영구자석 형상비를 고려한 영구자석 매입형 BLDC 전동기 설계 및 특성해석)

  • Yun Keun-Young;Rhyu Se-Hyun;Yang Byoung-Yull;Kwon Byung-Il
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.55 no.1
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    • pp.1-8
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    • 2006
  • Now a day, owing to high efficiency and easy speed control of brushless DC(BLDC) motor, the demand of BLDC motor that has high power and low noises are increasing. Especially demand of interior permanent magnet(IPM) BLOC with high efficiency and high power in electric motion vehicle is increasing. IPM BLDC motor has permanent magnets in the rotor. Because it has two different flux paths, magnetic reluctance differences are generated in d-axis and q-axis. As the result of the inductance differences that are generated by the saliency(magnetic reluctance differences) in the rotor, the motor has structure advantage that has the additional reluctance torque except a magnet torque and because magnet is situated inside the rotor, the mechanical structure is strong. Therefore IPM BLDC motor makes possible to have high speed and high power. This paper presents a design and characteristics analysis of IPM BLDC motor for electric vehicle. To design IPM BLDC motor, surface mounted permanent magnet(SPM) BLDC motor is used as the initial design model. According to the shape-ratio() of permanent magnet, the characteristic of IPM BLDC motor is analyzed by Finite element method (FEM). Characteristics analysis results of the designed motor are compared with the experimental results.

Air-Barrier Width Prediction of Interior Permanent Magnet Motor for Electric Vehicle Considering Fatigue Failure by Centrifugal Force

  • Kim, Sung-Jin;Jung, Sang-Yong;Kim, Yong-Jae
    • Journal of Electrical Engineering and Technology
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    • v.10 no.3
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    • pp.952-957
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    • 2015
  • Recently, the interior permanent magnet (IPM) motors for electric vehicle (EV) traction motor are being extensively researched because of its high energy density and high efficiency. The traction motor for EV requires high power and high efficiency at the wide driving region. Therefore, it is essential to fully consider the characteristics of the motor from low speed to high-speed driving regions. Especially, when the motor is driven at high speed, a significant centrifugal force is applied to the rotor. Thus, the rotor must be stably structured and be fully endured at the critical speed. In this paper, aims to examine the characteristics of the IPM motor by adjusting the width of air-barrier according to the permanent magnet position which is critical in designing an IPM motor for EV traction motors and to conduct a centrifugal force analysis for grasping mechanical safety.

Design and Experimental Verification of an Interior Permanent Magnet Motor for High-speed Machines (고속회전기 적용을 위한 매입형 영구자석 전동기의 설계 및 실험적 검증)

  • Kim, Sung-Il;Lee, Geun-Ho;Lee, Chang-Ha;Hong, Jung-Pyo
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.59 no.2
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    • pp.306-310
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    • 2010
  • On account of small size and light weight, a high-speed machine is regarded as a key technology for many future applications of drive systems. In high-speed applications, permanent magnet synchronous motors have a number of merits such as high efficiency and high power density. Therefore, they are suitable for driving the air-blower of a fuel cell electric vehicle (FCEV) where space and energy savings are critical. Particularly, a surface-mounted permanent magnet synchronous motor (SPMSM) of them is mainly used as a high-speed machine. However, the motor has a fatal flaw due to a retaining can to maintain the mechanical integrity of a rotor assembly. The can results in the increase of magnetic air-gap length in the SPMSM. Thus, in this paper, an interior permanent magnet synchronous motor (IPMSM) is applied in order to drive the air-blower of FCEV instead of the SPMSM, and the experimental results of two models are compared to verify the capability of the IPMSM for high-speed applications.

Analysis on the Core Loss and Windage Loss in Permanent Magnet Synchronous Motor for High-Speed Application (고속으로 운전되는 영구자석형 동기전동기의 철손 및 풍손 해석)

  • Jang, Seok-Myeong;Ko, Kyoung-Jin;Cho, Han-Wook
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.55 no.10
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    • pp.511-520
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    • 2006
  • Recently, more attention has been paid to the development of high-speed permanent magnet (PM) synchronous motors, since they are conductive to high efficiency, high power density, small size, and low weight. In high-speed PM machines, core loss and windage loss form a larger proportion of the total losses than usual in conventional mid- or low speed machines. This article deals with the analysis on the core loss and windage loss in PM synchronous motor for high-speed application. Using the data information from a manufacturer and non-linear curve fitting, this paper investigates the magnetic behavior and its core losses in the stator core using the electrical steels. And, the windage loss is calculated according to the variation of the rotational speed, motor inner pressure and temperature.

Microprocessor Based Sensorless Speed Control of Permanent Magnet Synchronous Motor (마이크로프로세서를 이용한 영구자석 동기전동기의 센서리스 속도제어)

  • 최재영;김성환;권영안
    • Journal of Advanced Marine Engineering and Technology
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    • v.20 no.3
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    • pp.121-130
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    • 1996
  • Permanent magnet synchronous motor is widely used in industrial drive applications due to high efficiency, high power ratio, and easy maintenance. Position and speed detectors required in this motor increase the drive cost, and reduce the application range. Some papers present the speed control without position and speed detectors using DSP characterized by high processing performance. However, DSP increases the cost, and makes the inplementation difficult. This study has performed the speed control without position and speed detector by means of the microprocessor system which can be easily accessed. The results of simulation and experiment showed comparatively good dynamics in spite of the sensorless system.

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Characteristic Analysis of Rotor Losses in High-Speed Permanent Magnet Synchronous Motor (초고속 영구자석형 동기 전동기의 회전자 손실 특성해석)

  • 장석명;조한욱;이성호;양현섭
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.53 no.3
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    • pp.143-151
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    • 2004
  • High-speed permanent magnet machines are likely to be a key technology for electric drives and motion control systems for many applications, since they are conductive to high efficiency, high power density, small size and low weight. In high-speed machines, the permanent magnets are often contained within a retaining sleeve. However, the sleeve and the magnets are exposed to high order flux harmonics, which cause parasitic eddy current losses. Rotor losses of high-speed machines are of great importance especially in high-speed applications, because losses heat the rotor, which is often very compact construction and thereby difficult to cool. This causes a danger of demagnetization of the NdFeB permanent magnets. Therefore, special attention should be paid to the prediction of the rotor losses. This paper is concerned with the rotor losses in permanent magnet high-speed machines that are caused by permeance variation due to stator slotting. First, the flux harmonics are determined by double Fourier analysis of the normal flux density data over the rotor surface. And then, the rectilinear model was used to calculate rotor losses in permanent magnet machines. Finally, Poynting vector have been used to investigate the rotor eddy current losses of high-speed Permanent magnet machine.

Design of Sensorless Controller for Interior Permanent-Magnet BLDC Motor (영구 자석 매립형 BLDC Motor의 Sensorless 제어기 설계)

  • 김학원;안준호;양순배;조관열;김정철
    • Proceedings of the KIPE Conference
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    • 1997.07a
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    • pp.79-83
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    • 1997
  • The inverter fed BLDC(Brushless DC) motor has been increasingly applied to industry and home appliances due to the advance of power electronics and permanent magnet technology, and its high efficiency and good acoustic noise characteristics. The BLDC motor and drives, however, require the rotor position sensors that may cause some problems such as the high cost and space. In this paper, sensorless algorithm for an interior permanent magnet BLDC motor is proposed. The maximum torque per ampere operation with advance angle considering load torque and speed was simulated and verified through the experiment.

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Optimal Design of an Outer-rotor Flux-switching Permanent Magnet Motor for High Speed Operation (외전형 FSPM(Flux Switching Permanent Magnet) 전동기의 고속 운전을 위한 최적 설계)

  • Lee, Jae-Kwang;Jang, Jin-Seok;Kim, Byung-Teak
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.60 no.11
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    • pp.2035-2042
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    • 2011
  • In this paper, we proposed the outer-rotor type of FSPM motor for high speed operation and optimized motor shape. First of all, combinations of pole and slot numbers are examined for the optimal back-EMF and cogging torque, then optimizes the better shape design of the permanent magnet, rotor pole width. Further, The winding turns are obtained by circle of the voltage limit equation and motor parameters to minimize the current and to improve the efficiency. As a result, the performance of the designed model is satisfied, and it is verified through a two-dimensional finite element method (2D-FEA).

Eddy Current Loss Analysis of the Permanent Magnet Brushless AC Motor (영구자석 브러시리스 AC 모터의 와전류 손실 특성해석)

  • Jang, S.M.;Cho, H.W.;Lee, S.H.;Jeong, Y.H.
    • Proceedings of the KIEE Conference
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    • 2002.07b
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    • pp.700-702
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    • 2002
  • High-speed brushless permanent magnet machines are good for compressor and aerospace applications, etc. since they are conductive to high efficiency, high power density, small size and low weight. This paper presents 3-phase permanent magnet brushless AC Motor designed for the high-speed drives. Especially, we predicted the inverter high frequency pulse width modulation (PWM) switching caused eddy current losses in a permanent magnet brushless dc motor.

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Permanent Magnet Brushless AC Motor for High Speed (초고속용 영구자석형 브러시레스 AC 모터의 자계 및 유기전압 특성)

  • Jang, S.M.;Yang, H.S.;Jeong, S.S.;Rhu, D.W.;Choi, S.K.;Lim, G.S.
    • Proceedings of the KIEE Conference
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    • 1999.07a
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    • pp.40-42
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    • 1999
  • High-speed brushless permanent magnet machines are good for compressor and aerospace applications, etc, since they are conductive to high efficiency, high power density, small size and low weight. This paper describes a diametrically magnetized PM motor with the rating of 4.3kW and 50000 rpm fur high-speed drive applications. To bear strong stress from high speed, rotor was designed cylindrical structure, was magnetized diametrically permanent magnet. The performance characteristic of motor was evaluated by means of FEA(Finite Element Analysis), no-load test And then, in order to find back-EMF constant, used FEA, search coil.

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