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Line-start permanent magnet synchronous motor with composite rotor is a new type of permanent magnet synchronous motor, which uses eddy currents induced in solid rotor and copper bars to achieve self- starting capability. In order to research the demagnetization of permanent magnets under three-phase short circuit and out-of-step fault, the finite element model considering saturation, eddy currents...
In this paper a cuckoo search based multi-objective optimal design of permanent magnet disc motor is proposed. In this research, the Cuckoo search technique is used as a search tool in the process of optimal design of a permanent magnet disc motor. The optimization search is based on the value of the objective function. The Cuckoo Search in general is a minimisation search algorithm and therefore...
This paper proposes an innovative hybrid multi-objective (MO), fast converging optimization algorithm, enabling global optimum tracking in permanent magnet traction motor design. The methodology developed is based on Artificial Bee Colony (ABC) technique, strength pareto evolutionary algorithm (SPEA2) and Differential Evolution (DE) strategy ensuring fast and reliable convergence to the optimal Pareto...
In the quasi-3D FEM, the overall performance of axial flux permanent magnet (AFPM) motor can be obtained by assembling 2-D FEM results of each cross section along a radial direction. A critical drawback of quasi-3D FEM is its inability to conduct finite element (FE) analysis when rotor back-iron and permanent magnet (PM) have different length along radial direction. In order words, because there is...
Line start permanent magnet synchronous motor (LSPMSM) is one of the highest efficiency motors due to no rotor copper loss at synchronous speed and self starting. LSPMSM has torque characteristics of both induction motor IM and Permanent Magnet Synchronous Motor-PMSM. In order to maximize efficiency, an optimal design method of cage-bars and magnet shape has to be considered [1]. The geometry parameters...
In this paper a genetic algorithm based optimal design of a permanent magnet synchronous motor (PMSM) is proposed. This approach employs a genetic algorithm (GA) technique as a search tool for optimal design solution of a PMSM based on the value of the objective function. The sum of the efficiency of the motor and the inverse value of the permanent magnet total weight is selected as a multi-objective...
This paper proposes a closed-form 3D analytical model developed for the estimation of eddy current losses in an interior permanent magnet synchronous machine. Two different types of commonly employed interior permanent magnet machines are considered for the loss analysis. The results of the analytical model are compared with the results from 3D finite element analysis. The proposed model can be directly...
This paper presents the thermal analysis of a five-phase Halbach array permanent magnet synchronous machine. The iron loss is calculated using a hybrid analytical finite element method with segmenting the stator into six parts. The proposed method is compared with both conventional method and pure finite element method. The results show that the proposed technique is accurate whereas it is more simple...
The present paper presents an analysis regarding the influence of the form and arrangement of permanent magnets on the value of the cogging torque for a surface permanent magnet synchronous motor, designed for the direct drive of the wheels of a vehicle. There are taken into consideration influences caused by: the constructive form of the magnets, the ratio between the pole-arc and the pole-pitch,...
In external rotor permanent magnet synchronous motors with non-overlapping windings, the higher frequency harmonics of the radial forces generate considerable resonant vibrations and acoustic noise. Therefore, diversity of spatial and specifically frequency harmonic ordinal numbers of representative slot and pole number combinations are derived analytically with open circuit and under load. Amplitudes...
The performance of motion control on a PMLSM is greatly affected by nonlinearities caused by thrust ripple. The approach of combinational iron-cored primary suggests a thrust ripple-free PMLSM. This paper investigates inductance parameter characteristics and thrust linear modeling of the PMLSM with combinational iron-cored primary. Inductance parameters are derived based on parameters of its armature...
Detent force is the main component of thrust ripple which is one of the unique characteristics of permanent magnetic linear synchronous motor (PMLSM). This paper briefly analyzes the causes and features of the detent force, and presents an improved structure of PMLSM on the basis of position shift and phase shift superposition method of multiple motors. The finite element method is used to simulate...
This paper deals with a design of high torque brushless DC motor (BLDC). This motor is designed in new arrangement of the stator teeth and operated as three phase motor. This motor is developed to produce high torque performance motor that could be used as in-wheel motor for agriculture applications such as tractors. The basic structure and principle of the motor is described briefly. The simulation...
A novel doubly salient permanent magnet motor named flux switch permanent magnet motor (FSPM) was designed and analyzed. The stator and rotor of FSPM are all salient structures. There are a marked verge domino effect and serious saturation phenomenon. Due to high nonlinearities of FSPM, finite element method (FEM) was used to analyze magnetic field distribution, permanent magnet flux linkage, electromotive...
The magnetic fields of permanent magnet brushless DC motors surface-mounted with parallel magnetization magnets and radial magnetization magnets were computed with finite element method. The finite element computation results show that the air-gap flux density of brushless DC motor with radial magnetization magnets is increased by 25% than that of brushless DC motor with parallel magnetization magnets...
This paper presents the design procedure and modeling methodology for a four sided floating type of linear permanent magnet generator used in sea wave energy extraction applications. The hydraulic system of wave generation with buoy has been developed. Appropriate coupled magnetic-electric-mechanical models for the analysis of the linear permanent magnet (LPM) generator is researched with finite element...
This paper discusses the arrangement of the flux barriers in the stator of the outer rotor type IPMSM. IPMSM usually has the flux barriers for preventing the short circuit of magnetic flux near the permanent magnet. However, the flux barriers are used in the stator to improve the efficiency in this study. A two-dimensional finite element method (2D-FEM) is introduced to analyze the various modified...
This paper proposes a novel technique to reduce the detent force in permanent magnet linear synchronous motor (PMLSM) using auxiliary poles technique. The detent force that is caused by the attraction between permanent magnet (PM) and the iron core without input current can be divided into two components: the slot effect and the end effect. To reduce these two effects, we analyze the characteristics...
This study deals with the characteristics analysis and optimum design of Permanent Magnet Assisted Synchronous Reluctance Motor (PMASynRM) using Finite Element Method (FEM) and Response Surface Methodology (RSM). The focus of this paper is finding of optimum design solutions due to the characteristics analysis of d, q axis inductance according to the size and magnetizing quantity of interior permanent...
Considering the characters of high permeability, high resistivity, low loss and low cost for soft magnetic ferrite in high-frequency alternating magnetic field, this paper proposes a novel high speed permanent-magnet motor based on soft magnetic ferrite. Soft magnetic ferrite ring is used for stator core, rare earth permanent magnet ring serves as the rotor poles, and the slotless configuration with...
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