• Title/Summary/Keyword: PM Motor

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Torque Characteristics Analysis of Interior Permanent Magnet Synchronous Motor According to Pole Arc Ratio (극호비 변화에 따른 영구자석 매입형 동기전동기의 토크 특성 해석)

  • LEE Kab-Jae;Kim Ki-Chan;Lee Jong-In;Kwon Joong-Lok
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.54 no.2
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    • pp.81-87
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    • 2005
  • The torque characteristics of permanent magnet(PM) motor is varied according to magnet width. In this paper, the design method of magnet and magnetic circuit is proposed in order to improve the torque of Interior Permanent Magnet Synchronous Motor(IPMSM). This paper presents the effects of pole arc ratio and salient pole ratio on the torque and torque ripple in the IPMSM with concentrated winding.

A Study on the Load Torque Observer based on Fuzzy Logic Control for a PM Synchronous Motor (영구자석 동기전동기를 위한 퍼지 제어기법 기반의 부하 토크관측기에 관한 연구)

  • Jung, Jin-Woo;Lee, Dong-Myung
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.24 no.10
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    • pp.26-32
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    • 2010
  • This paper proposes a new load torque observer based on the Takagi-Sugeno fuzzy method for a permanent magnet synchronous motor(PMSM). A Linear Matrix Inequality(LMI) parameterization of the fuzzy observer gain is given, and the LMI conditions are derived for the existence of the fuzzy load torque observer guaranteeing $\alpha$-stability and linear quadratic performance. In this paper, a nonlinear speed controller is employed to validate the performance of the proposed fuzzy load torque observer, and various simulation results are presented under motor parameter and load torque variations.

Design and Analysis of High Speed Motor/Generator for 5kWh Flywheel Energy Storage System (5kWh급 플라이휠 에너지 저장장치용 초고속 전동발전기의 설계 및 특성해석)

  • Jang, S.M.;Cho, H.W.;Lee, S.H.;Ryu, D.W.
    • Proceedings of the KIEE Conference
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    • 2003.07b
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    • pp.1051-1053
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    • 2003
  • Flywheel Energy Storage System (FESS) consists of a high-speed flywheel with an integral motor/generator suspended on magnetic bearings and in an evacuated housing. Permanent magnet (PM) machines as the FESS motor/generator are a popular choice. since there are no excitation losses which mean substantial increase in the efficiency. In this paper, the basic design and the steady-state performances of a permanent magnet synchronous high speed motor/generator for FESS are presented.

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Suppression Method for Torque Ripple of PM Synchronous Motor

  • Yonezawa Hiroyuki;Taniguchi Katsunori;Lee Hyun Woo
    • Journal of Power Electronics
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    • v.5 no.4
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    • pp.264-271
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    • 2005
  • A new modified trapezoidal modulating signal for a pulse width modulation (PWM) inverter suitable for a permanent magnet synchronous motor (PMSM) drive is proposed in this paper. A new modulating signal for the PMSM drive is determined by the characteristic torque ripple of the motor with various electro-motive force (EMF). The proposed modulating signal is able to decrease the torque ripple even if the motor has sinusoidal EMF or non-sinusoidal EMF. By using the proposed modulating signal, the system reduced the torque ripple as well as achieved the effective utilization of the DC supply voltage for the inverter. Many improvements are accomplished by the PWM strategy adapting the modified trapezoidal modulating signal without a change in hardware.

The Rotor Barrier Design of the BLDC Motor Consider that Irreversible Demagnetization of Permanent Magnets (영구자석의 불가역 감자 현상을 고려한 BLDC 전동기의 회전자 자속 장벽 설계)

  • Kim, Cheol-Min;Cho, Gyu-Won;Kim, Gyu-Tak
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.63 no.1
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    • pp.48-53
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    • 2014
  • Generally, the usage motor in the vehicle is exposed to highly ambient temperature and large vibration according to repeatedly starting and stopping during very short time. So, in this paper, the rotor shape design was performed to improve demagnetization endurance by considering starting current of Brushless DC Motor (BLDCM) through Finite Element Method(FEM). As a result, the end of Permanent Magnet (PM) in the basic model was occurring a partial irreversible demagnetization by starting current. To solve this problem, the installing flux barrier was limited to flux line on the core. Accordingly, demagnetization endurance and operating characteristics were improved.

Effect of Pole to Slot Ratio on Cogging torque and EMF Waveform in Fractional Slotted PM motor (PM 모터에서 극당 슬롯비율이 코깅토오크와 역기전력 파형에 미치는 영향력에 관한 연구)

  • Kim, Do-Wook;Min, Cheol-Ki;Jun, Myung-Sun;Lee, Kab-Jae;Lee, Ju
    • Proceedings of the KIEE Conference
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    • 2002.04a
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    • pp.74-76
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    • 2002
  • Conventional integral slot design tend to have a high cogging torque and large end turns which contribute to copper losses. The fractional slot is more effective compared to integral slot in the cogging torque and EMF waveform. The effectiveness of fractional slot can be maximized by selecting optimal pole to slot ratio. This paper presents the effect of pole to slot ratio on the cogging torque and EMF waveform in the fractional slotted permanent magnet(PM) motor. The effectiveness of the proposed designs had been confirmed by comparing cogging torque, and EMF waveform between conventional and new models which are analyzed by Finite Element Method(FEM).

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Comparison of Slotted and Slotless Ring-wound PM Brushless Machines for Electro-Mechanical Battery (EMB용 전동발전기 선정을 위한 슬롯형과 슬롯리스 Ring-wound형 영구자석 브러시리스 기기의 특성 비교)

  • Jang, Seok-Myeong;Jeong, Sang-Sub;Ryu, Dong-Wan;Choi, Sang-Kyu
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.50 no.3
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    • pp.107-114
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    • 2001
  • Electro-mechanical battery (EMB) consists of a high-speed fly wheel with an integral motor/ generator suspended on magnetic bearings and in an evacuated housing. Permanent magnet (PM) machines as the EMB motor/ generator are a popular choice, since there are no excitation losses which means substantial increase in the efficiency. In this paper we present the comparison of conventional slotted and slotless ring-wound types, aimed at EMB and other high-speed drives. We firstly discuss the topology of each machine for this particular application. these machines are primarily designed as 1kW two-pole PM generator with the rated speed of 40000 rpm. the motoring torque of 0.51 Nm has to be enough to accelerate the flywheel to the rated speed. We then present the comparison of the open-circuit field, the armature reaction field and winding inductance. next we analyze the induced voltage and the developed torque per unit stack length and unit weight of different machines. Finally, we estimate and compare the losses and the efficiency at motoring and generating modes.

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Evaluation of Hand Grip Strength and EMG Signal on Visual Reaction (시각 반응에 대한 악력과 EMG 신호의 평가)

  • Shin, Sung-Wook;Jeong, Sung-Hoon;Chung, Sung-Taek
    • Korean Journal of Applied Biomechanics
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    • v.24 no.2
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    • pp.161-166
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    • 2014
  • Hand grip strength has been utilized as an indicator to evaluate the motor ability of hands, responsible for performing multiple body functions. It is however difficult to evaluate other factors (other than hand muscular strength) utilizing the hand grip strength only. The purpose of this study was analyzed the motor ability of hands using EMG and the hand grip strength, simultaneously in order to evaluate concentration, muscular strength reaction time, instantaneous muscular strength change, and agility in response to visual reaction. In results, the average time (and their standard deviations) of muscular strength reaction EMG signal and hand grip strength was found to be $209.6{\pm}56.2$ ms and $354.3{\pm}54.6$ ms, respectively. In addition, the onset time which represents acceleration time to reach 90% of maximum hand grip strength, was $382.9{\pm}129.9$ ms. Results in visual reaction (on) indicate the differences in muscular strength agility and concentration of participants in regards to visual reaction.

Design of Auxiliary Teeth on the Edge of Stationary Discontinuous Armature PM-LSM with Concentrated Winding

  • Kim, Sung-Jin;Kim, Yong-Jae;Jung, Sang-Yong
    • Journal of Magnetics
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    • v.18 no.3
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    • pp.352-356
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    • 2013
  • Recently, the stationary discontinuous armature, Permanent Magnet Linear Synchronous Motor (PM-LSM), was suggested as a driving source for long-distance transportation system. However, as these motors arrange armatures discontinuously, an edge occurs thereby leading to a cogging force. This works as a factor that hinders the acceleration and deceleration that takes place when movers enter into and eject from armatures. Therefore, in this study, the installation of auxiliary teeth on the edge of the armature of PM-LSM is suggested in order to reduce the cogging force caused by the edge when the armature is placed in a discontinuous arrangement. Auxiliary teeth are optimally designed by a 2-D numerical analysis using the finite element method was performed to generate the optimum design of the auxiliary teeth. The validity of the study was confirmed through the comparison of the cogging force induced at the edge in respect to the design parameter using the basic model.