• Title, Summary, Keyword: high-speed permanent magnet (PM) motor

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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.

Design and Analysis for Loss Reduction of High-Speed Permanent Magnet Motor using a Soft Magnetic Composite

  • Lee, Sung-Ho;Kim, Yong-Jae;Lee, Kyu-Seok;Kim, Sung-Jin
    • Journal of Magnetics
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    • v.20 no.4
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    • pp.444-449
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    • 2015
  • Soft magnetic composites (SMCs) are especially suitable for the construction of low-cost, high-performance motors with 3-D magnetic fields. The main advantages of SMCs is that the iron particles are insulated by the surface coating and adhesive used for composite bonding, the eddy-current loss is much lower than that in laminated steels, especially at higher frequencies, and the hysteresis loss becomes the dominant component of core losses. These properties enable machines to operate at higher frequencies, resulting in reduced machine size and weight. In this paper, 3-D topologies are proposed that enable the application of SMCs to effectively reduce losses in high-speed permanent magnet (PM) motors. In addition, the electromagnetic field characteristics of the motor topologies are evaluated and compared using a non-linear finite element method (FEM) based on 3-D numerical analysis, and the feasibility of the motor designs is validated.

Design and analysis of the characteristics of PM-SM for the high-speed drives (고속용 영구자석형 동기 모터의 설계와 특성 해석)

  • Jang, S.M.;Jeong, S.S.;Yang, H.S.
    • Proceedings of the KIEE Conference
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    • pp.49-51
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    • 1998
  • This paper presents 2-pole permanent magnet synchronous motor(PM-SM) designed for the high-speed drives. Therefore. this motor has the NdFeB Permanent magnet as rotor. which is designed simper than the commercial PM-SM. We treated the developments - design. analysis - of PM-SM

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

  • Kim, Sung-Il;Hong, Jung-Pyo;Lee, Woo-Taik;Choi, Chin-Chul;Kwon, Hyuck-Roul;Park, Jeong-Hee
    • Proceedings of the KIEE Conference
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    • pp.857_858
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    • 2009
  • 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 (PM) synchronous motors have a number of merits such as high efficiency and high power density. Accordingly, 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 PM motor of them is mainly used as a high-speed machine. However, the motor has a fatal flaw owing 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 surface-mounted PM motor. Thus, in this paper, an interior PM motor is designed in order to drive the air-blower of FCEV instead of the surface-mounted PM motor, and the experimental results of two models are compared to verify the capability of the interior PM motor for a high-speed machine.

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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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    • 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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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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Design Technique of a Permanent Magnet High-speed Motor for Improving Power Density and Efficiency (영구자석 고속전동기의 출력밀도 및 효율 향상을 위한 설계 기법)

  • Lee, Ki-Doek;Lee, Ju;Lee, Hyung-Woo
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.63 no.3
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    • pp.425-430
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    • 2014
  • This paper presents a design technique to improve the power density and efficiency of a permanent magnet high-speed motor by using the mono-PM rotor. The suggested model minimized rotor diameter and stack length which have a bad influence on shafting in the high-speed operation. Conventional and suggested motors are analyzed and compared by using FEM(Finite Element Method) to verify the effectiveness. The overall performance such as torque, losses, efficiency and power density and so on are investigated in detail. The results of the analysis deduced that the suggested mono-PM rotor design is superior to the conventional one.

Calculation of Rotor Loss according to analysis of Harmonics for Permanent Magnet High Speed Motor (영구자석 고속모터의 고조파 분석을 통한 회전자 손실해석)

  • Jang, S.M.;Cho, H.W.;Lee, S.H.;Yang, H.S.;Jeong, Y.H.
    • Proceedings of the KIEE Conference
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    • pp.1042-1044
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    • 2003
  • High speed PM machines are being developed as motor/generators for gas-turbine generator sets in smaller power sizes, and as motors for number of applications including gas compressors, machine tools and turbo molecular pumps. Due to the high peripheral speed of the rotor and the relatively high conductivity of the magnets used, rotor eddy current loss can be substantial. This paper deals with the calculation of rotor eddy-current losse in permanent magnet(PM) high speed motor using the analysis of harmonics.

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Design Parameter Deduction for Slotless Permanent Magnet Synchronous Motor/Generator (슬롯리스 영구자석 동기 전동/발전기를 위한 설계변수 도출)

  • Jang, Seok-Myeong;Lee, Un-Ho;You, Dae-Joon;Ko, Kyoung-Jin;Lee, Jung-Pill
    • Proceedings of the KIEE Conference
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    • pp.53-55
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    • 2008
  • In high speed applications, the slotless permanent magnet(PM) motors appear an attractive solution, being almost insensitive to magneto-motive force harmonics and to pulse width modulation(PWM) current ripple and exhibiting lower stator iron losses and rotor losses (significant with square wave current control). So, this paper deals with methods for design of permanent magnet synchronous motor/generator.

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MODELING OF IRON LOSSES IN PERMANENT MAGNET SYNCHRONOUS MOTORS WITH FIELD-WEAKENING CAPABILITY FOR ELECTRIC VEHICLES

  • Chin, Y.K.;Soulard, J.
    • International Journal of Automotive Technology
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    • v.4 no.2
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    • pp.87-94
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    • 2003
  • Recent advancements of permanent magnet (PM) materials and solid-state devices have contributed to a substantial performance improvement of permanent magnet machines. Owing to the rare-earth PMs, these motors have higher efficiency, power factor, output power per mass and volume, and better dynamic performance than induction motors without sacrificing reliability. Not surprisingly, they are continuously receiving serious considerations for a variety of automotive and propulsion applications. An electric vehicle (EV) requires a high-effficient propulsion system having a wide operating range and a capability of generating a high peak torque for short durations. The improvement of torque-speed performance for these systems is consequently very important, and researches in various aspects are therefore being actively pursued. A great emphasis has been placed on the efficiency and optimal utilization of PM machines. This requires attention to many aspects related to the machine design and overall performance. In this respect, the prediction of iron losses is particularly indispensable and challenging, especially for drives with a deep field-weakening range. The objective of this paper is to present iron loss estimations of a PM motor over a wide speed range. As aforementioned, in EV applications core losses can be significant during high-speed operation and it is imperative to evaluate these losses accurately and take them into consideration during the motor design stage. In this investigation, the losses are predicted by using an analytical model and a 2D time-stepped finite element method (FEM). The results from different analytical approaches are compared with the FEM computations. The validity of each model is then evaluated by these comparisons.