• Title, Summary, Keyword: Average torque

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Direct Torque Control Method of Induction Machine with Constant Average Torque (일정한 토크 평균치를 가지는 유도전동기 직접토크제어기법)

  • Kim, Jeong-Ok;Jo, Nae-Su;Choe, Byeong-Tae;Kim, U-Hyeon;Im, Seong-Un;Gwon, U-Hyeon
    • Proceedings of the KIEE Conference
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    • pp.31-34
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    • 2003
  • There are several types of switching table for selection voltage vector in direct torque control of induction motor. In general, two-quadrant and four-quadrant operation switching table are used mostly. Two-quadrant operation has an advantage that reduced the torque ripples in comparison with four-quadrant operation, but it has the defect that is not constant average torque. Because the torque increasing slope size by non-zero voltage vector is different from the torque decreasing slope size by zero voltage vector as speed region. The main objective of this study is to maintain constant average torque using two-quadrant operation switching table. In proposed method, the torque increasing slope or decreasing slope are calculated before selected voltage vector is applied. Then, it is applied to zero voltage vector or non-zero voltage vector until the torque increasing slope and decreasing slope are equal. In total magnitude. Therefore it becomes to maintain average torque at whole operation speed. The validity of the proposed method is proven by simulated and experimental results.

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Effect of Geometrical Parameters on Optimal Design of Synchronous Reluctance Motor

  • Nagarajan, V.S.;Kamaraj, V.;Balaji, M.;Arumugam, R.;Ganesh, N.;Rahul, R.;Lohit, M.
    • Journal of Magnetics
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    • v.21 no.4
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    • pp.544-553
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    • 2016
  • Torque ripple minimization without decrease in average torque is a vital attribute in the design of Synchronous Reluctance (SynRel) motor. As the design of SynRel motor is an arduous task, which encompasses many design variables, this work first analyses the significance of the effect of varying the geometrical parameters on average torque and torque ripple and then proposes an extensive optimization procedure to obtain configurations with improved average torque and minimized torque ripple. A hardware prototype is fabricated and tested. The Finite Element Analysis (FEA) software tool used for validating the test results is MagNet 7.6.0.8. Multi Objective Particle Swarm Optimization (MOPSO) is used to determine the various designs meeting the requirements of reduced torque ripple and improved torque performance. The results indicate the efficacy of the proposed methodology and substantiate the utilization of MOPSO as a significant tool for solving design problems related to SynRel motor.

The Influence of The Starting Permanent Magnet on Average Torque of The Salient Pole Rotor Type Single Phase SRM (영구자석 기동장치가 회전자 돌극형 단상 SRM의 평균 토오크에 미치는 영향)

  • Kim, Jun-Ho;Lee, Eun-Woong;Lee, Chung-Won;Seo, Jung-Min;Kim, Gyeon-Muk
    • Proceedings of the KIEE Conference
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    • pp.1030-1032
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    • 2003
  • Single phase SRM(switched reluctance motor) can not be start by itself because positive torque is generated in limited section. Therefore single phase SRM need starting device which is place the rotor in positive torque section when motor is begun to start. The prototype of salient pole rotor type single phase SRM, fabricated in previous research, has permanent magnet starting device. It is installed in bottom of the rotor for starting by itself. But, it is affected the motor when driving and cause the decrease of torque and speed. On this paper, average torque of the prototype was measured according to installation of the starting device or not. And influence of the staring device on average torque was confirmed by comparison of the results.

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Multi-Object Optimization of the Switched Reluctance Motor

  • Choi, Jae-Hak;Kim, Sol;Kim, Yong-Su;Lee, Sang-Don;Lee, Ju
    • KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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    • v.4B no.4
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    • pp.184-189
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    • 2004
  • In this paper, multi-object optimization based on a progressive quadratic response surface method (PQRSM) and a time stepping finite element method (FEM) is proposed. The new PQRSM and FEM are able to decide optimal geometric and electric variables of the switched reluctance motor (SRM) with two objective functions: torque ripple minimization and average torque maximization. The result of the optimum design for SRM demonstrates improved performance of the motor and enhanced relationship between torque ripple and average torque.

Sensitivity Analysis of Geometrical Parameters of a Switched Reluctance Motor with Modified Pole Shapes

  • Balaji, M.;Ramkumar, S.;Kamaraj, V.
    • Journal of Electrical Engineering and Technology
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    • v.9 no.1
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    • pp.136-142
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    • 2014
  • A major problem in Switched Reluctance Motor (SRM) is torque ripple, which causes undesirable acoustic noise and vibration. This work focuses on reducing the undesirable torque ripple in SRM by modifying stator and rotor geometry. This paper presents a comparative study on torque ripple minimization in SRM with modified pole shapes such as stator pole taper, stator pole face with non-uniform air gap and pole shoe attached to rotor pole. Further this paper presents a detailed sensitivity analysis of the effect of different geometrical parameters that alter the pole face shapes on the performance of SRM. The analysis is performed using finite-element method considering average torque and torque ripple as performance parameters. Based on the analysis, a design combining stator pole taper with non-uniform air gap is proposed to improve the torque characteristics of SRM. The dynamic characteristics of the proposed design are simulated and the results show satisfactory reduction in torque ripple.

A Study on the Cogging Torque Reduction in a Novel Axial Flux Permanent Magnet BLDC Motor (축방향 자속형 영구자석 BLDC 전동기의 코깅 토크 저감에 관한 연구)

  • Jo, Won-Young;Lee, In-Jae;Koo, Dae-Hyun;Chun, Yon-Do;Cho, Yun-Hyun
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.55 no.9
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    • pp.437-442
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    • 2006
  • Cogging torque, the primary ripple component in the torque generated by permanent magnet (PM) motors, is due to the slotting on the stator or rotor. This article shows the reduction of cogging torque in a novel axial flux permanent magnet (AFPM) motor through the various design schemes. 3D finite element method is used for the exact magnetic field analysis. The effects of slot shapes and skewing of slot on the cogging torque and the average torque have been investigated in detail.

The Effect of a Taping on Muscle Strength, and Proprioception in Ankle (테이핑에 따른 발목 근력, 고유수용성감각에 미치는 영향)

  • Lee, Sang-Young
    • Journal of the Korean Society of Physical Medicine
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    • v.3 no.4
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    • pp.225-233
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    • 2008
  • Purpose : The purpose of this study was to investigate changes of muscle strength, ROM and proprioceptive function as before & after ankle taping in soccer players. For this study fifteen sports club whose had no ankle injuries were volunteered. Methode : Fifteen healthy male in soccer players participated in this study. Biodex pro system3 was used to measure isokinetic muscle strengths at $60^{\circ}$/sec angular velocity. Performances of ankle joint were measured peak torque, total work, average power, total work. To measure proprioceptive function used goniometer. Results : 1. proprioceptive sensation error were significantly differences by before & after taping(p<.05). 2. Compare of total work of dorsi flexion plantar flexion weren't significantly differences by before & after taping(p>.05). 3. Compare of average power of dorsi flexion weren't significantly differences by before & after taping(p>.05). 4. Compare average power of plantar flexion were significantly differences by before & after taping(p<.05). 5. Compare average peak torque of dorsi flexion weren't significantly differences by before & after taping(p>.05). 6. Compare average peak torque of plantar flexion were significantly differences by before & after taping(p<.05). Conclusion : Taping can have propriocetive aberrative angular measure, power & peak torque of plantar flexion were significantly differences. But, total work of dorsi flexion plantar flexion and power & peak torque of dorsi flexion weren't significantly differences.

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Analysis of The Generating Torque Characteristics of 2-Phase lnduction Motor in Phase Control. (이상유도전동기의 립상제어시 발생토오크에 대한 해석)

  • 원종수;장도현
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.37 no.5
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    • pp.289-297
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    • 1988
  • In this paper, the analysis of a generating torque characteristics of 2-phase induction motor driven with the phase control method is presented. The generating torque equations which represent average torque and pulsating torque are derived from the elementary machine model. The calculating equations which can get the values of average torque and pulsating torque is expressed by the parameters of the equivalent circuit of 2-phase induction motor. According to the calculating equations, these performance characteristics are investigated under various conditions. Finally, a strategy to eliminate non-linearity and pulsating torque generated in driving 2-phase induction motor with the phase control method is presented.

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Reduction of Torque Ripple in an Axial Flux Generator Using Arc Shaped Trapezoidal Magnets in an Asymmetric Overhang Configuration

  • Ikram, Junaid;Khan, Nasrullah;Khaliq, Salman;Kwon, Byung-il
    • Journal of Magnetics
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    • v.21 no.4
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    • pp.577-585
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    • 2016
  • In this paper, model of the axial-flux permanent magnet synchronous generator (AFPMSG) having arc-shaped trapezoidal permanent magnets (PM) is presented. The proposed model reduces the cogging torque and torque ripple, at the expense of lowering the average output torque. Optimization of the proposed model is performed by considering the asymmetric overhang configuration of the PMs, as to make the output torque of the proposed model competitive with the conventional model. The time stepped 3D finite element analysis (FEA) is performed for the comparative analysis. It is demonstrated that the torque ripple of the optimized model is highly reduced as well as average output torque is increased.

Maximization average torque control of Switched Reluctance Motor using least square method (최소자승법을 이용한 Switched Reluctance Motor의 최대 평균토오크 제어)

  • 김춘삼;정연석
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.16 no.5
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    • pp.61-65
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    • 2002
  • RM(Switched Reluctance Motor)'s Torque is generated by phase-current and inductance profile. A new analytical concept is proposed to determine the turn-off angle for maximization of the torque output. This paper describes a new method to maximization the average torque of a current control Switched Reluctance Motor. It is based on the simplified turn-off angle equation using least square method. Simulations carried out on a three-phase 6/4 pole SRM justify the algorithm is described. The suggested maximization average torque is verified by simulation in this paper.