• Title, Summary, Keyword: permanent magnet

Search Result 2,760, Processing Time 0.049 seconds

Optimal Design of Permanent Magnet Actuator Using Parallel Genetic Algorithm (병렬유전 알고리즘을 이용한 영구자석형 액추에이터의 최적설계)

  • Kim, Joong-Kyoung;Lee, Cheol-Gyun;Kim, Han-Kyun;Hahn, Sung-Chin
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.57 no.1
    • /
    • pp.40-45
    • /
    • 2008
  • This paper presents an optimal design of a permanent magnet actuator(PMA) using a parallel genetic algorithm. Dynamic characteristics of permanent magnet actuator model are analyzed by coupled electromagnetic-mechanical finite element method. Dynamic characteristics of PMA such as holding force, operating time, and peak current are obtained by no load test and compared with the analyzed results by coupled finite element method. The permanent magnet actuator model is optimized using a parallel genetic algorithm. Some design parameters of vertical length of permanent magnet, horizontal length of plunger, and depth of permanent magnet actuator are predefined for an optimal design of permanent magnet actuator model. Furthermore dynamic characteristics of the optimized permanent magnet actuator model are analyzed by coupled finite element method. A displacement of plunger, flowing current of the coil, force of plunger, and velocity of plunger of the optimized permanent magnet actuator model are compared with the results of a primary permanent magnet actuator model.

A Torque Compensation Method Considering Temperature Variation of SPMSM

  • Jung, Tae-Uk;Park, Chang-Seok
    • Journal of Electrical Engineering and Technology
    • /
    • v.13 no.1
    • /
    • pp.160-167
    • /
    • 2018
  • This paper analyzed the effect of temperature on the permanent magnet flux and output torque. The major parameter which will impact the torque control accuracy of a surface mounted permanent magnet motor is the variation of the permanent magnet temperature. In addition, the temperature variation of the permanent magnet will also influence the maximum torque per ampere of the motor. To analyze the effect of temperature on the permanent magnet, the rotor of the motor was directly heated to measure the temperature and the permanent magnet flux was measured. As a result, the output torque of the motor decreases as the temperature of the rotor permanent magnet increases. Therefore, this paper proposes a technique to compensate the phase current of the motor by estimating permanent magnet flux, and it is proved through theoretical basis and several experiments.

Analysis of Detent Force Reduction Method in a Permanent Magnet Linear Synchronous Motor

  • Jang, Seok-Myeong;Yoon, In-Ki;Lee, Sung-Ho;Kang, Do-Hyun;Jeong, Yeon-Ho
    • KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
    • /
    • v.12B no.1
    • /
    • pp.1-6
    • /
    • 2002
  • The severe problem in improving the positioning precision of a permanent magnet linear synchronous motor (PMLSM) is the large detent farce caused by the permanent magnet arrangement. It is generally an undesired effect that contributes to the torque ripple, vibration and noise of machine. The detent force is arisen from the difference of the position of a permanent magnet end and a tooth position. In this paper, the four methods to reduce detent force were studied and analyzed. The methods are adjusting the width of permanent magnet, varying the shape of armature teeth, relocating the permanent magnet, and adjusting the width of permanent magnet and relocating the permanent magnet at the same time. To analyze the detent farce according to flour methods, a two-dimensional Finite Element Analysis [FEA] was used and we compared with the ratio of reduction of the detent farce according to the flour methods.

Fault Diagnosis Method of Permanent Magnet Synchronous Motor for Electrical Vehicle

  • Yoo, Jin-Hyung;Jung, Tae-Uk
    • Journal of Magnetics
    • /
    • v.21 no.3
    • /
    • pp.413-420
    • /
    • 2016
  • The permanent magnet synchronous motor has high efficiency driving performance and high power density output characteristics compared with other motors. In addition, it has good regenerative operation characteristics during braking and deceleration driving condition. For this reason, permanent magnet synchronous motor is generally applied as a power train motor for electrical vehicle. In permanent magnet synchronous motor, the most probable causes of fault are demagnetization of rotor's permanent magnet and short of stator winding turn. Therefore, the demagnetization fault of permanent magnet and turn fault of stator winding should be detected quickly to reduce the risk of accident and to prevent the progress of breakdown of power train system. In this paper, the fault diagnosis method using high frequency low voltage injection was suggested to diagnose the demagnetization fault of rotor permanent magnet and the turn fault of stator winding. The proposed fault diagnosis method can be used to check the faults of permanent magnet synchronous motor during system check-up process at vehicle starting and idling stop mode. The feasibility and usefulness of the proposed method were verified by the finite element analysis.

Permanent Magnet Shape Optimization of Moving Magnet type PMLSM for Thrust Ripple Minimization (가동 영구자석형 PMLSM 추력리플 최소화를 위한 영구자석 형상 최적화)

  • Yoon Kang-Jun;Lee Dong-Yeup;Kim Gyu-Tak
    • The Transactions of the Korean Institute of Electrical Engineers B
    • /
    • v.54 no.2
    • /
    • pp.53-59
    • /
    • 2005
  • In this paper, optimum shape design of permanent magnet in slotted type Permanent Magnet Linear Synchronous Motor(PMLSM) is progressed for minimization of detent force owing to structure of slot-teeth and thrust ripple by harmonic magnetic flux of permanent magnet. In order to reduce remodeling time as changing design parameter for Permanent Magnet shape optimization, the moving model node technique was applied. The characteristics of thrust and detent force computed by finite element analysis are acquired equal effect both skewed basic model and optimum model which is optimization of permanent magnet shape. In addition to, thrust per unit volume is improved 4.l2[%] in optimum model.

Improved Method for Calculating Magnetic Field of Surface-Mounted Permanent Magnet Machines Accounting for Slots and Eccentric Magnet Pole

  • Zhou, Yu;Li, Huaishu;Wang, Wei;Cao, Qing;Zhou, Shi
    • Journal of Electrical Engineering and Technology
    • /
    • v.10 no.3
    • /
    • pp.1025-1034
    • /
    • 2015
  • This paper presented an improved analytical method for calculating the open-circuit magnetic field in the surface-mounted permanent magnet machines accounting for slots and eccentric magnet pole. Magnetic field produced by radial and parallel permanent magnet is equivalent to that produced by surface current according to equivalent surface-current method of permanent magnet. The model is divided into two types of subdomains. The field solution of each subdomain is obtained by applying the interface and boundary conditions. The magnet field produced by equivalent surface current is superposed according to superposition principle of vector potential. The investigation shows harmonic contents of radial flux density can be reduced a lot by changing eccentric distance of eccentric magnet poles compared with conventional surface-mounted permanent-magnet machines with concentric magnet poles. The FE(finite element) results confirm the validity of the analytical results with the proposed model.

A study on the transient characteristics in Single-phase Line-start Permanent Magnet (단상 유도동기 전동기(LSPM)의 과도 특성에 관한 연구)

  • Jung, Dae-Sung;Lee, Ju;Ree, Cheol-Jick
    • Proceedings of the KIEE Conference
    • /
    • /
    • pp.631-632
    • /
    • 2006
  • This paper is written by research for the transient characteristics of the Single-phase Line-start permanent Magnet. The Single-phase Line-start permanent Magnet is most likely to substitute for Single-phase Induction Motor which is used about many appliance currently, because that has good points. For example, It has a Line-start of ability and a High-efficiency. And it need not power convergence device. The rotor of The Single-phase Line-start permanent Magnet has cage-bar with permanent magnet. This motor is started by cage-bar. When it entered synchronous condition, the rotor is rotated by the permanent magnet. But the design of the permanent magnet is very important, because the breaking torque of the permanent magnet interrupt to start a rotor. Finally, if Flux Barrier is not concerned, we do not get result of our object. Therefore this thesis is concerned about Flux Barrier.

  • PDF

A Study on Cogging Torque Reduction of Dual Stator Radial Flux Permanent Magnet Generator Using the Permanent Magnet Displacement Design of Rotor (회전자의 영구자석 위치 이동을 이용한 이중 고정자 RFPM 발전기 코깅토크 저감 연구)

  • Lee, Gyeong-Chan;Jung, Tae-Uk
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
    • /
    • v.28 no.4
    • /
    • pp.49-55
    • /
    • 2014
  • In this paper, we propose the cogging toque reduction technique of the dual stator radial flux permanent magnet generator. The cogging toque is caused by the torque ripple increase and vibration and noise of the generator. And it is important factor determining cut-in speed of the small wind generator. To reduce cogging torque, permanent magnet displacement was studied. And the theory of the permanent magnet displacement was formulated and the cogging torque reduction according to the permanent magnet displacement was confirmed through the finite element method.

Optimization of the Permanent Magnet Shape in Moving Magnet Type Permanent Magnet Linear Synchronous Motor (Moving Magnet Type PMLSM의 영구자석 형상 최적화)

  • Lee, Dong-Yeup;Kim, Gyu-Tak
    • Proceedings of the KIEE Conference
    • /
    • /
    • pp.121-123
    • /
    • 2006
  • In this paper, the notch of teeth and skew of permanent magnet are used to reduce the detent force caused by slot-teeth structure. Also, the shape of permanent magnet is optimized to reduce the detent forceowing to flux hannonics components of permanent magnet. As a result, thrust is decrease about 2[%]. But, the distortion ratio of thrust is decreased from 1.04[%] to 0.75[%]. And, the ripple ratio of thrust is decreased from 2.6[%] to 1.65[%].

  • PDF

Moving Mesh Technique for Dynamic Characteristics Analysis of Permanent Magnet Linear Synchronous (영구 자석형 선형 동기전동기의 동특성 해석을 위한 이동 메쉬 기법)

  • Woo, Kyung-Il;Kwon, Byung-Il
    • The Transactions of the Korean Institute of Electrical Engineers B
    • /
    • v.50 no.2
    • /
    • pp.53-58
    • /
    • 2001
  • This paper describes a moving mesh technique for dynamic characteristics analysis of permanent magnet linear synchronous motor with the secondary aluminium sheet. The moving mesh technique applied to the linear induction motor can be used to analyze the linear synchronous motor with the rectangular permanent magnet. But in case of the permanent magnet with taper, the shape of the permanent magnet is presented. The time-stepped finite element method is used for the dynamic characteristics simulation of the permanent magnet linear synchronous motor, The results of application example(hysteresis current controlled inverter fed control) such as thrust, current and flux plots are shown.

  • PDF