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The single-phase BLDCM(Brushless DC Motor) has many defects. This paper compares optimized single-phase BLDCM with existing commercial single-phase BLDCM and develops single-phase BLDCM with high efficiency, satisfying demanded power and torque in pump system. This paper presents the statistical optimum design of single-phase BLDCM for pump system by ANOVA(Analysis of Variance) to select effective...
In this paper, torque characteristics analysis of synchronous reluctance motor by winding function theory is described. The stator is same as one of the induction motor but rotor have two differential geometries of the flux barrier to reduce the torque ripple. The flux barriers were designed by optimization algorism considering torque ripple. Inductances for the separate part of the rotor were calculated...
Low-speed flux-modulated (FM) motor, which violates the conventional design rule and has different number of pole pairs in the stator and rotor, is examined. In the original FM motor, the magnetic flux is modulated using special iron segments in the air gaps. It has the merit of having high power density at low speed. In this paper an improved structure of the FM motor which has only one air gap between...
This paper presents the optimal design method of cage-bars in a single-phase line-start permanent magnet synchronous motor. This method consists of two procedures. First, the basic design of cage-bars is made by analytic method of an induction motor. But, this method cannot consider nonlinear characteristic as magnetic saturation and leakage flux. Therefore, at second step, for considering the nonlinear...
Summary form of only given: New design methodology using the numerically identified the synthetic flux linkages for Interior Permanent Magnet Synchronous Motor(IPMSM) with multi-layered PMs is proposed. Furthermore, the cross-magnetization between the d-q axis in IPMSM mainly due to the magnetic saturation is investigated via the adopted synthetic flux linkages. The proposed design methodology using...
This paper proposes rotor flux barriers of an interior permanent magnet synchronous motor (IPMSM) to minimize additional losses caused by harmonics of flux density. To obtain sinusoidal flux distribution in air gap, a flux barrier shaped like a rib is introduced and an equivalent magnetic circuit is employed to design the barriers shape. Finally an IPMSM with the determined barrier is analyzed by...
It is well-known that cogging torque is difficult to be precisely computed in fractional-slot permanent magnet (PM) machines even using finite-element method (FEM). In this paper an improved and simple method of cogging torque computation with normal-size mesh elements in FEM is presented. The main merit is that the accuracy is guaranteed, complicated mesh refinement work is avoided and computing...
This paper studies the effect of pole and slot combination on the noise and vibration of permanent magnet synchronous motor (PMSM). Two PMSMs which have different pole and slot combinations and same performances are designed. First, using the electromagnetic finite element analysis (FEA) and equivalent magnetizing current method, the local forces of these two motors are calculated. And then, the vibration...
This paper presents modeling of motor parameter for parametric design of interior permanent magnet synchronous motor(IPMSM). Parametric design gives effective motor parameters for IPMSM considering control strategy. Characteristics of IPMSM are greatly influenced by Ψa, Ld and Lq. Parametric design provides motor characteristics according to variation of and Ψa, Ld by solving voltage equations of...
The paper presents a new successful design of a double rotor permanent magnet synchronous machine, where special attention was paid to the outer and inner rotor construction. The machine's structure enables its use in hybrid electric vehicles as a four-quadrant drive system as well as in pure electric vehicles as a single traction motor/generator. Thus, high torque density and low torque ripple values...
This paper presents the study of a novel axial flux permanent magnet (AFPM) machine, which consist of the segmented stator and fractioned slot windings, with one rotor and double stator. In addition, the overhang effect of permanent magnet of the motor has been analyzed quantitatively. The overhang is used to enhance the force density in permanent magnet machine. According to the variation of overhang...
The permanent magnet synchronous machine with an external rotor is the most important device for high performance electrical drive systems in particular for hybrid electric vehicles. The paper presents finite element analyses of a such a machine in terms of a comparison of both Y- and Δ-connected stator windings. The influence on the most important design parameters such as electromagnetic torque...
The magnetic property of electrical steel sheet has an anisotropy even in the case of non-oriented material. In order to analyze the operating condition of a synchronous reluctance motor preciously, the magnetic field analysis considering the magnetic anisotropy of electrical steel sheet using the fixed-point method was carried out.
To reduce cost and improve efficiency, a novel design concept of a traction motor for electric vehicle based on a driving cycle is proposed. In comparison with conventional design method of electric motors, the proposed design concept considers the real load condition and highlights special requirements of electric vehicle. Based on the proposed approach, an interior permanent magnet traction motor...
TFRM(Transverse Flux Rotary Machine) has many defects. This paper develops 3 phase TFRM with high torque and low torque ripple, satisfying demanded speed and nominal torque in direct drive motor and compares optimized 3 phase TFRM with existing prototype TFRM. This paper presents the statistical optimum design of 3 phase TFRM for direct-drive motor system using the penalty method (characteristic function)...
A single phase LSPM (Line-Start Permanent Magnet Motor) has been investigated to improve the efficiency. Single phase LSPM has a permanent magnet (PM) inserted rotor which generates magnet torque and reluctance torque. The torques fluctuate due to asynchronous motion during transient state. The torques act as a breaking torque which make the motor not to start. To obtain good design of single phase...
The torque ripple of a PM synchronous motor (PMSM) originates from two sources; the cogging torque and mismatch between the back EMF and phase current waveforms. The first source is only related to the magnetic design parameters of PMSM and the second source is related to the effect of the driving circuit on the magnetic design parameters. Therefore, achieving a minimum torque ripple requires a hybrid...
The research proposes a solution for the sensorless control of Surface Mounted PM motors at zero speed. A creative strategy that involves minor change in the rotor is presented. The proposed FEA serves to evaluate the effectiveness of the strategy quickly and accurately down to very low speed.
Permanent Magnet (PM) machines constitute a favored drive choice in electric traction applications due to their increased efficiency. Design optimization of such machines could enhance their ability to satisfy contradictory static and dynamic requirements. In this paper a Differential Evolution (DE) algorithm for PM machine design optimization, coupled with a finite element analysis (FEA) is employed.
The post 1-D analysis for laminated cores is developed for accurate estimation of torque and loss in rotating machines. The nonlinear eddy current analysis along the thickness of the electrical steel sheets in the core is carried out at each element in the main finite element analysis in order to estimate the loss and the harmonic torques caused by the eddy currents and the hysteresis phenomenon in...
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