• Title/Summary/Keyword: ripple reduction

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A New Current Control Method for Torque Ripple Reduction on Brushless DC Motor (Brushless DC Motor에서 토크리플 저감을 위한 새로운 전류제어 기법)

  • Kwon K.J.;Kim S.H.
    • Proceedings of the KIPE Conference
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    • 2003.07b
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    • pp.575-578
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    • 2003
  • This paper presents a new current control method to reduce torque ripple of Brushless DC Motor during commutation. In the proposed control strategy, the current slopes of rising and decaying phase during commutation is equalized by the compensation voltage. By adding the compensation voltage for it to the current controller output, the reduced torque ripple can be obtained. The simulation and experimental results show that the proposed method reduces the torque and the current ripples significantly.

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Design of Linear Synchronous Motor for Thrust Force Ripple Reduction using Module Phase Set Shift (Module Phase Set Shift를 이용한 선형 동기 전동기의 추력 리플 저감 설계)

  • Ryu, Gwang-Hyeon;Lee, Hyung-Woo;Cho, Su-Yeon;Oh, Se-Young;Ham, Sang-Hwan;Im, Jong-Bin;Ahn, Han-Woong;Lee, Ju
    • Proceedings of the KIEE Conference
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    • 2011.07a
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    • pp.848-849
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    • 2011
  • Rotating machines are using gears to change the rotary motion into the linear motion, on the other hand, linear motors have a accurate position control and excellent dynamic characteristics because of generating a thrust force directly. But the important problem, one of the linear motor is a high thrust force ripple. Thrust force ripple has a bad effect on the position accuracy and the dynamic characteristics, so it is necessary to reduce the thrust force ripple. Cogging is one of the cause that affect thrust force ripple. Cogging has some connection with the GCD between pole pitch and teeth pitch It is proposed method to reduce a thrust ripple of the linear motor that chamfering, skew, and so on. In this paper, the module phase set shift(MPSS) is used to reduce a thrust force ripple that has a similar effect to skew. And propose a method that reduce a thrust force ripple more by use of chamfering.

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Optimal Design of Ferromagnetic Pole Pieces for Transmission Torque Ripple Reduction in a Magnetic-Geared Machine

  • Kim, Sung-Jin;Park, Eui-Jong;Kim, Yong-Jae
    • Journal of Electrical Engineering and Technology
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    • v.11 no.6
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    • pp.1628-1633
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    • 2016
  • This paper derives an effective shape of the ferromagnetic pole pieces (low-speed rotor) for the reduction of transmission torque ripple in a magnetic-geared machine based on a Box-Behnken design (BBD). In particular, using a non-linear finite element method (FEM) based on 2-D numerical analysis, we conduct a numerical investigation and analysis between independent variables (selected by the BBD) and reaction variables. In addition, we derive a regression equation for reaction variables according to the independent variables by using multiple regression analysis and analysis of variance (ANOVA). We assess the validity of the optimized design by comparing characteristics of the optimized model derived from a response surface analysis and an initial model.

Torque ripple Reduction of High speed Minituale BLDC using instantaneous voltage control (초고속 소형 BLDC의 순시전압 제어에 의한 토크 리플 억제)

  • Lee, Dong-Hee;Kim, Tae-Hyoung;Ahn, Jin-Woo;Won, Tae-Hyun
    • Proceedings of the KIEE Conference
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    • 2006.04b
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    • pp.91-94
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    • 2006
  • Miniature BLDC is widely used in industrial applications and especially medical appliances because of there character that high driving efficiency and high torque characteristic. However torque ripple of a high speed miniature BLDC is serous in switching period cue to the very electrical time constant. This paper present instant voltage and current control for torque ripple reduction of a high speed miniature BLDC. Computer simulation and experiment test for 40,000 rpm miniature BLDC show the verification of the proposed control method.

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Torque Ripple Reduction Drive of Single-Phase SRM with High Power Factor (단상 SRM의 토크리플 저감을 고려한 고역률 구동)

  • Kim B.C.;Park S.J.;Ahn J.W.
    • Proceedings of the KIPE Conference
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    • 2003.07a
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    • pp.481-484
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    • 2003
  • A strategy for a torque ripple reduction drive of single-phase SRM with high power factor is proposed. The drive for switched reluctance motor (SRM) is presented to achieve sinusoidal, near unity power factor input current with low torque ripple. The proposed SRM drive has no additional active switch. And a single-stage approach, which combines a DC link capacitor used as dc source and a drive used for driving the motor into one power stage, has a simple structure and low cost. The characteristics and validity of the proposed circuit is discussed in depth through the experimental results.

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A study on the torque ripple reduction of PMSM in direct torque control by using dither signal (Dithering기법에 의한 직접 토크 제어 방식의 토크리플 개선에 관한 연구)

  • Lee H.H.;Kim J.H.
    • Proceedings of the KIPE Conference
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    • 2003.07a
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    • pp.415-419
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    • 2003
  • This paper focuses on a simple technique to reduced torque ripple in the direct torque control inverter for PMSM drive. It is actually impossible to raise the inverter switching frequency in the conventional system, although the hysterisis bandwidths for the stator flux and torque control are sufficiently diminished, because of the sampling Interval and the delay in estimating the flux and the torque In order to overcome the problem, the proposed method introduces a dithering technique into the conventional system by superposing triangular waves with high frequency and minute amplitude on the torque error. And the programable 3- stage lowpass filter is added instead of pure Integrator. Simulation results prove the feasibility of proposed strategy compared with conventional method.

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Torque Ripple Reduction Drive of Single-Phase SRM with High Power Factor (고역률 저토크 단상 SRM)

  • Kim Bong-Chul;Park Sung-Jun;Ahn Jin-Woo
    • Proceedings of the KIPE Conference
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    • 2004.07b
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    • pp.959-962
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    • 2004
  • A strategy for a torque ripple reduction drive of single-phase SRM with high power factor is proposed. The drive for switched reluctance motor (SRM) is presented to achieve sinusoidal, near unity power factor input current with low torque ripple. The proposed SRM drive has no additional active switch. And a single-stage approach, which combines a DC link capacitor used as do source and a drive used for driving the motor into one power stage, has a simple structure and low cost. The characteristics and validity of the proposed circuit is discussed in depth through the experimental results.

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Reduction of Torque Ripple of Permanent Magnet Synchronous Motor (영구자석 동기전동기의 토크 리플 저감 운전)

  • Lee, D.H.;Lee, J.H.;Kim, Y.S.;Kim, J.H.;Kwon, Y.A.
    • Proceedings of the KIEE Conference
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    • 2001.07b
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    • pp.918-920
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    • 2001
  • PMSM drives are widely used in industrial and residential applications because of high efficiency, high power density and high performance. For better performance of PMSM, however, torque ripples should be reduced. This paper investigates a reduction of torque ripple due to the unsinusoidal flux linkage produced by the shapes of stator slot and magnetic pole. To minimize torque ripple, a simple flux estimator is proposed. This method iteratively compensates the distributed flux linkage from an error between the measured and estimated currents. The proposed algorithm is verified through simulation.

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A Method of Torque Ripple Reduction using Commutation Time Control in BLDC Motor (전환시간 제어를 통한 BLDC전동기의 토크리플 저감 방법)

  • Her, Nam-Euk;Oh, Tae-Seok;Kim, Il-Hwan
    • Proceedings of the KIEE Conference
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    • 2006.10c
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    • pp.342-344
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    • 2006
  • This paper present a method of current control for torque ripple reduction in brushless dc motor which have a trapezoid back EMF. In such drives the current ripples are generated by motor inductance in stator windings and the back EMF. The ripples suppression techniques that are practically effective in high speed as well as in low speed regions are rarely found. The proposed method here is based on a strategy that the commutation intervals of the incoming ang the outgoing phases can be equalized by a proper PWM control.

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Rotor Shape Design of an Interior PM Type BLDC Motor for Improving Mechanical Vibration and EMI Characteristics

  • Hur, Jin;Kim, Byeong-Woo
    • Journal of Electrical Engineering and Technology
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    • v.5 no.3
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    • pp.462-467
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    • 2010
  • This paper presents the rotor shape optimization of an interior type permanent magnet (IPM) motor for a reduction of vibration and Electromagnetic Interference (EMI). The vibration and EMI in permanent magnet motors is generated by cogging torque ripple, radial force and commutation torque ripple. Consequently, in order to improve vibration and EMI, the optimal notches are put on the rotor pole with an arc shape proposed. The variation of vibration frequency due to the cogging torque and radial force of each model is computed by the finite element method (FEM). From the analysis result and experiment, we confirmed the proposed model has remarkably improved the vibration and EMI.