• Title/Summary/Keyword: Flux-switching

Search Result 204, Processing Time 0.031 seconds

Comparative Study of Flux Regulation Methods for Hybrid Permanent Magnet Axial Field Flux-switching Memory Machines

  • Yang, Gongde;Fu, Xinghe;Lin, Mingyao;Li, Nian;Li, Hao
    • Journal of Power Electronics
    • /
    • v.19 no.1
    • /
    • pp.158-167
    • /
    • 2019
  • This research comparatively studies three kinds of flux regulation methods, namely, stored capacitor discharge pulse (SCDP), constant current source pulse (CCSP), and quantitative flux regulation pulse (QFRP), which are used for hybrid permanent magnet (PM) axial field flux-switching memory machines (HPM-AFFSMMs). Through an analysis of the operation principle and the series hybrid PM flux regulation mechanism of the objective machine, the circuit topologies and flux regulation process of these flux regulation methods are addressed in detail. On the basis of a simulation, the flux regulation characteristics of the researched machine during the magnetization and demagnetization processes are comparatively evaluated. Then, machine performance, including back EMF, direct and quadrature axis inductances, and magnetization and demagnetization characteristics, is quantitatively investigated. Results show that the QFRP enables the HPM-AFFSMM to achieve a less harmonic component of back EMF by approximately 7.28% and 7.97% at the magnetization and demagnetization states, respectively, and a more complete magnetization process than the SCDP and CCSP.

The P/PI Mode Switching Method of Gopinath Flux Observer for Sensorless Vector Control of Induction Motors (유도전동기 센서리스 벡터제어를 위한 고피나스 자속관측기의 P/PI 모드 전환)

  • Kang, Myeong-Kyu;Choi, Jong-Woo
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.66 no.12
    • /
    • pp.1732-1739
    • /
    • 2017
  • This paper presents a sensorless vector control algorithm of closed loop Gopinath flux observer to enhance the robustness at low speed by switching P/PI mode. Closed loop Gopinath flux observer has the problem in sensorless vector control of induction motor at low speed. This paper solves the problem using the characteristic function of closed loop Gopinath flux observer. P mode shows better performance than PI mode under the cut-off frequency of observer. But P mode always has a flux error due to DC offset, so this paper combines P mode and PI mode. This algorithm shows good performance over wide speed range. The performance has been confirmed through computer simulations using MATLAB SIMULINK and experiments.

A Novel Space Vector modulation Scheme and Direct Torque Control for Four-switch BLDCM Using Flux Observer

  • Pan, Lei;Wang, Beibei;Su, Gang;Cheng, Baohua;Peng, Guili
    • Journal of Electrical Engineering and Technology
    • /
    • v.10 no.1
    • /
    • pp.251-260
    • /
    • 2015
  • The main purpose of this paper is to describe a DTC (direct torque control) method for four-switch brushless dc motor (BLDCM) drive. In the method, a novel voltage space vector modulation scheme, an optimal switching table, and a flux observation method are proposed. Eight voltage vectors are summarized, which are selected to control BLDCM in SVPWM pattern, and an optimal switching table is proposed to improve the torque distortion caused by midpoint current of the split capacitors. Unlike conventional flux observers, this observer does not require speed adaptation and is not susceptible to speed estimation errors, especially, at low speed. Global asymptotic stability of the flux observer is guaranteed by the Lyapunov stability analysis. DC-offset effects are mitigated by introducing a PI component in the observer gains. This method alleviates the undesired current and torque distortion which is caused by uncontrollable phase. The correctness and feasibility of the method are proved by simulation and experimental results.

A Study on a Flux Switching Motor Drive for Fan Application

  • Kim, Nam-Hun
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
    • /
    • v.23 no.7
    • /
    • pp.49-56
    • /
    • 2009
  • A new class of electronically commutated brushless motors, the flux-switching motor (FSM), is gradually emerging for use in power tools and household appliances especially fan and pump application thanks to green policies, This motor offers such advantages as high-power density and relatively high efficiency compare to induction motors, and low cost and simple motor structure compare to the BLDC motor. This paper presents the principle of the FSM and design of the 12/6 pole FSM drive system for fan application. Test results of the prototype motor are provided to verify the validity of the fan application with a TMS320F2812 DSP and inverter.

Optimal Design of an Outer-rotor Flux-switching Permanent Magnet Motor for High Speed Operation (외전형 FSPM(Flux Switching Permanent Magnet) 전동기의 고속 운전을 위한 최적 설계)

  • Lee, Jae-Kwang;Jang, Jin-Seok;Kim, Byung-Teak
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.60 no.11
    • /
    • pp.2035-2042
    • /
    • 2011
  • In this paper, we proposed the outer-rotor type of FSPM motor for high speed operation and optimized motor shape. First of all, combinations of pole and slot numbers are examined for the optimal back-EMF and cogging torque, then optimizes the better shape design of the permanent magnet, rotor pole width. Further, The winding turns are obtained by circle of the voltage limit equation and motor parameters to minimize the current and to improve the efficiency. As a result, the performance of the designed model is satisfied, and it is verified through a two-dimensional finite element method (2D-FEA).

Design Techniques for Reducing Cogging Torque in Permanent Magnet Flux Switching Machine

  • Wang, Daohan;Wang, Xiuhe;Jung, Sang-Yong
    • Journal of Magnetics
    • /
    • v.18 no.3
    • /
    • pp.361-364
    • /
    • 2013
  • Permanent magnet flux switching motor (PMFSM) is a novel double salient machine which employs PMs instead of field winding for excitation. PMFSM contains only one set of armature winding, thereby features simple control strategy, low cost power inverter and substantial high efficiency. Due to the unique double salient structure and operation principle, the generated cogging torque in PMFSM is critical and quite different compared to the traditional PM machines. This paper presents and investigates various design techniques for reducing cogging torque in PMFSM. Firstly, an analytical model is proposed to study the influence of different methods on cogging torque. Then the optimal design parameters for minimizing cogging torque are determined by the analytical model, which significantly reduces the computational efforts. At last, the cogging torque with different design approaches are simulated by FEA along with the average output electromagnetic torque, which validates the analysis above.

Problems of Stator Flux Estimation in DTC of PMSM Drives

  • Kadjoudj, M.;Golea, N.;Benbouzid, M.E.H
    • Journal of Electrical Engineering and Technology
    • /
    • v.2 no.4
    • /
    • pp.468-477
    • /
    • 2007
  • The DTC of voltage source inverter-fed PMSMs is based on hysteresis controllers of torque and flux. It has several advantages, namely, elimination of the mandatory rotor position sensor, less computation time, and rapid torque response. In addition, the stator resistance is the only parameter, which should be known, and no reference frame transformation is required. The DTC theory has achieved great success in the control of induction motors. However, for the control of PMSM drives proposed a few years ago, there are many basic theoretical problems that must be clarified. This paper describes an investigation into the effect of the zero voltage space vectors in the DTC system and points out that if using it rationally, not only can the DTC of the PMSM drive be driven successfully, but torque and flux ripples are reduced and overall performance of the system is improved. The implementation of DTC in PMSM drives is described and the switching tables specific for an interior PMSM are derived. The conventional eight voltage-vector switching table, which is namely used in the DTC of induction motors does not seem to regulate the torque and stator flux in a PMSM well when the motor operates at low speed. Modelling and simulation studies have both revealed that a six voltage-vector switching table is more appropriate for PMSM drives at low speed. In addition, the sources of difficulties, namely, the error in the detection of the initial rotor position, the variation of stator resistance, and the offsets in measurements are analysed and discussed.

A Study on High Efficiency Flux Switching Motor drive (플럭스 스위칭 전동기의 고효율 드라이브에 대한 연구)

  • Min, Byeng-Jae;Kim, Dong-Hee;Koo, Bon-Sam;Choi, Keyng-Ho;Kim, Nam-Hun
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
    • /
    • v.24 no.2
    • /
    • pp.92-100
    • /
    • 2010
  • A new class of electronically commutated brushless motor, the flux-switching motor(FSM) is gradually emerging in power tools and household appliances especially fan and pump application because of green policy. This motor offers advantages of high-power density and relatively high efficiency compare with induction motor, low cost and simple motor structure compare with bldc motor. This paper presents the principle of the FSM and design of the 12/6 pole FSM drive system for fan application. Finally, test results of the prototype motor are provided to verify a validity of the fan application with TMS320F2812 DSP and inverter.

Direct Torque Control of Induction Motor Using Optimal Hysteresis Band Amplitude (최적의 히스테리시스 밴드 크기를 이용한 유도전동기의 직접토크제어)

  • Jeong, Byeong-Ho;Shin, Sa-Hyun;Lim, Byung-Ok;Lee, Kang-Youn;Cho, Geum-Bae;Baek, Hyung-Lae
    • Proceedings of the KIEE Conference
    • /
    • 2003.07b
    • /
    • pp.1208-1210
    • /
    • 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 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.

  • PDF

Characteristic Analysis of a Hybrid Excited Flux Switching PM Motor by Using the Equivalent Magnetic.Electric Circuit Method (가변자속형 FSPM 전동기의 등가 전.자기회로를 이용한 특성해석)

  • Jang, Jin-Seok;Lee, Jae-Gwang;Kim, Byung-Taek
    • Proceedings of the KIEE Conference
    • /
    • 2011.07a
    • /
    • pp.818-819
    • /
    • 2011
  • 본 논문은 가변자속 기능을 가지는 Flux Switching Permanent Magnet (FSPM) 전동기의 전 자기적 등가회로를 이용한 특성해석방법을 다룬다. 우선 가변자속 기능을 갖는 FSPM 전동기의 구조와 동작원리를 설명하였다. 다음으로 오버행을 고려한 2-D유한요소 해석 모델을 이용하여 역기전력, 인덕턴스를 구하였다. 마지막으로 등가회로 해석을 통해 가변자속 운전 시 FSPM 전동기의 특성해석을 실시하였다.

  • PDF