• Title, Summary, Keyword: flux switching

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Torque Calculation of Flux Switching Motor by Winding Function Theory (Winding function theory를 이용한 flux switching motor의 토크 계산)

  • Kim, Jae-Gon;Park, Han-Seok;Woo, Kyung-Il
    • Journal of the Korean Society of Marine Engineering
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    • v.39 no.4
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    • pp.478-482
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    • 2015
  • This paper describes the torque calculation of Flux Switching Motor using Winding Function Theory. First of all, the optimized new Flux Switching Motor was proposed to minimize the torque ripple. The simulation results by the Winding Function Theory were compared with those from Finite Element Analysis. The revised Flux Switching Motor and experimental setup were manufactured. The simulation result by the Winding Function Theory was compared with that of the experiment. The comparison validated the analysis method of the Flux Switching Motor by Winding Function Theory.

An Improved Central 60° Synchronous Modulation for High Transient Performance with PMSM Stator Flux Control Used in Urban Rail Transit Systems

  • Fang, Xiaochun;Lin, Fei;Yang, Zhongping
    • Journal of Power Electronics
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    • v.16 no.2
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    • pp.542-552
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    • 2016
  • Central 60° synchronous modulation is an easy pulse-width modulation (PWM) method to implement for the traction inverters of urban rail trains at a very low switching frequency. Unfortunately, its switching patterns are determined by a Fourier analysis of assumed steady-state voltages. As a result, its transient responses are not very good with over-currents and high instantaneous torque pulses. In the proposed solution, the switching patterns of the conventional central 60° modulation are modified according to the dynamic error between the target and actual stator flux. Then, the specific trajectory of the stator flux and current vector can be guaranteed, which leads to better system transients. In addition, stator flux control is introduced to get smooth mode switching between the central 60° modulation and the other PWMs in this paper. A detailed flow chart of the control signal transmission is given. The target flux is obtained by an integral of the target voltage. The actual PMSM flux is estimated by a minimum order flux state observer based on the extended flux model. Based on a two-level inverter model, improved rules in the α-β stationary coordinate system and equations of the switching patterns amendment are proposed. The proposed method is verified by simulation and experimental results.

Operation Principle and Topology Structures of Axial Flux-Switching Hybrid Excitation Synchronous Machine

  • Liu, Xiping;Wang, Chen;Zheng, Aihua
    • Journal of international Conference on Electrical Machines and Systems
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    • v.1 no.3
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    • pp.312-319
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    • 2012
  • The operation principle of an axial flux-switching hybrid excitation synchronous machine (AFHESM) is analyzed and its topology structures are proposed in this paper. After some comprehensive analysis of the operation principle to axial flux electrical machine, flux-switching electrical machine and hybrid excitation electrical machine, the operation principle of AFHESM is given. Combined with some typical topological structures of hybrid excitation electrical machine, some possible topological structures are proposed and some comprehensive comparisons are carried out. The analysis results show that the stator-separated AFHESM has some advantages such as less AM turns, less impact on the demagnetization of PM, less magnetic flux-leakage and higher efficiency compared to other topologies.

Direct Torque Control according to Flux and Torque of Hysterisis Band (자속 및 토오크 히스테리시스 밴드폭에 따른 직접토오크 제어)

  • Choi, Youn-Ok;Jeong, Sam-Yong;Kim, Dae-Gon;Kim, Pyung-Ho;Cho, Geum-Bae;Baek, Hyung-Lae
    • Proceedings of the KIEE Conference
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    • pp.1206-1208
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    • 2001
  • Direct torque control(DTC) of AC motor has the fast torque and flux dynamic responses even though it has very simple scheme to implement. DTC is also very simple in its implementation because it needs only two hysteresis comparators and switching vector table for both flux and torque control. The amplitude of hysteresis band greatly influences on the drive performance such as flux and torque ripple, switching frequency and current harmonics. Therefore, authors analysis flux and torque hysteresis bands is suggested considering switching frequency and harmonic distortion of currents.

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Preliminary study on a 3D field permanent magnet flux switching machine - from tubular to rotary configurations

  • Wang, Can-Fei;Shen, Jian-Xin
    • Journal of international Conference on Electrical Machines and Systems
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    • v.1 no.4
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    • pp.505-508
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    • 2012
  • A permanent magnet flux switching (PMFS) machine has a simple rotor, whilst both magnets and coils are set in the stator, resulting in easy removal of heat due to both copper loss and eddy current loss in magnets. However, the volume of magnets used in PMFS machines is usually larger than in conventional PM machines, and leakage flux does exist at the non-airgap side. To make full use of the magnets and gain higher power density, a novel 3-dimensional (3D) field PMFS machine is developed. It combines merits of the tubular linear machine, external-rotor rotary machine and axial-flux rotary machine, hence, offers high power density and peak torque capability, as well as efficient utility of magnets owing to the unique configuration of triple airgap fields.

A Study of Using Optimal Hysteresis Band Amplitude for Direct Torque Control of Induction Motor (유도전동기 직접토크제어의 히스테리시스 밴드 크기의 최적화에 관한 연구)

  • Jeong B.H.;Kim S.K.;Park J.K.;Oh G.K.;Cho G.B.;Baek H.L.
    • Proceedings of the KIPE Conference
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    • pp.812-815
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    • 2003
  • Most of all, DTC drive is very simple in its implementation because it needs only two hysteresis comparator and switching vector table for both flux and torque control. The switching strategy of a conventional direct torque control scheme which is based on hysteresis comparator results in a variable switching frequency which depends on the speed, flux, stator voltage and the hysteresis of the comparator. The amplitude of hysteresis band greatly influences on the drive performance such as flux and torque ripple and inverter switching frequency. In this paper the influence of the amplitudes of flux and torque hysteresis bands and sampling time of control program on the torque and flux ripples are investigated. Simulation results confirm the superiority of the DTC under the proposed method over the conventional DTC.

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A Study of Using Optimal Hysteresis Band Amplitude Tuning for Direct Torque Control of Induction Motor (최적의 히스테리시스 대역폭을 이용한 유도전동기 직접토크제어에 관한 연구)

  • Jeong, B.H.;Cho, G.B.;Choi, C.J.;Baek, H.L.;Hwang, J.S.;Kim, Y.M.
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.598-601
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    • 2003
  • Most of all, DTC drive is very simple in its implementation because it needs only two hysteresis comparator and switching vector table for both flux and torque control. The switching strategy of a conventional direct torque control scheme which is based on hysteresis comparator results in a variable switching frequency which depends on the speed, flux, stator voltage and the hysteresis of the comparator. The amplitude of hysteresis band greatly influences on the drive performance such as flux and torque ripple and inverter switching frequency. In this paper the influence of the amplitudes of flux and torque hysteresis bands and sampling time of control program on the torque and flux ripples are investigated. Simulation results confirm the superiority of the DTC under the proposed method over the conventional DTC.

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A Study on the Iron Losses in Flux-Switching Permanent Magnet Machines

  • Shin, Heung-Kyo
    • Journal of Electrical Engineering and Technology
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    • v.13 no.2
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    • pp.699-703
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    • 2018
  • Flux-switching permanent magnet machines (FSPMM) have doubly-salient and simple structures making it cost effective and suitable for mass production. In addition, it is possible to increase the rotor rotating speed and concentrate the flux of the permanent magnet on the air-gap. Due to these merits, the FSPMM can be applied to the various industry applications. To improve the performance, various design variables need to be studied in terms of design techniques. In this paper, we especially concentrate on the distribution of iron losses using a two-dimensional finite-element method (2D FEM). As a result, we can get an information for high efficiency FSPMM design.

A Stator-Separated Axial Flux-Switching Hybrid Excitation Synchronous Machine

  • Liu, Xiping;Zheng, Aihua;Wang, Chen
    • Journal of international Conference on Electrical Machines and Systems
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    • v.1 no.4
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    • pp.399-404
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    • 2012
  • In this paper, a stator-separated axial flux-switching hybrid excitation synchronous machine (SSAFHESM) is presented, of which the structure and operational principle are introduced. The magnetic field distribution under different excited currents is analyzed, and some characteristics including flux-linkage, EMF and field control ability are studied by finite element analysis (FEA). Tests are carried out on a 12/10-pole prototype machine to validate the analysis results, and an excellent agreement is obtained.

Analysis Of Induction Motor Direct Control Using VI Space Vector (VI 공간벡터와 관련한 유도전동기 Direct Control 분석)

  • 오성업
    • Proceedings of the KIPE Conference
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    • pp.207-210
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    • 2000
  • In this paper a theoretical formulation of the direct control relating the action exerted by the inverter space vectors on the stator flux and the torque of Induction motor is analyzed. From the equation the scheme of the inverter switching is proposed and influence of the stator flux and the electromagnetic torque in each switching pattern is also analyzed.

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