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In this paper a systematic procedure for designing a switched reluctance machine (SRM) is given. The process starts with specified torque, speed and DC bus voltage and ends with stator dimensions, rotor dimensions and stator winding details. It is divided into three parts - machine configuration where number of phases, stator and rotor poles are chosen, magnetic design where the machine dimensions...
This paper proposes a systematic process of a multi-objective optimal design of an axial-flux permanent-magnet motor for electric scooters. In the preliminary design, the zero-dimensional magnetic circuit model is used to determine the numbers of slots and poles and the initial size of the motor according to the driving requirements of scooter. In the optimal design process, the one-dimensional magnetic...
In this research, a magnetic equivalent circuit (MEC) model for population-based design (PBD) of salient-pole wound-rotor synchronous machines (WRSMs) is derived. The model includes a unique approach to represent fringing flux to the rotor poles based upon observations of flux paths seen in finite element solutions. In addition, the airgap flux tubes are simplified by including rotor fringing as separate...
This paper puts forward a cylindrical staggered- sheet structure Tubular Linear Step Motor. The structure and operating principle are introduced. Magnetic equivalent circuit modeling is developed, and the air-gap permeance is formulated, the nonlinear equivalent magnetic circuit equation for the Tubular Linear Step Motor is obtained through mesh flux method. Finally, Dynamic magnetic circuit for the...
In this paper, a nonlinear magnetic circuit network model is proposed for a three-phase 12-stator-slot/10-rotor-pole hybrid-excited flux-switching machine for electrical vehicles, which can predict the static electromagnetic characteristics, including the open-circuit air-gap field distributions, phase PM flux-linkage, phase back-electromotive force (back-EMF) waveform and winding inductances. To...
This paper presents a promising technique for estimating the cores losses of a fractional-slot concentrated-winding (FSCW) interior permanent magnet (IPM) machine using a simplified lumped-parameter magnetic circuit model (MCM). This model incorporates several key nonlinear phenomena including (i) magnetic saturation; (ii) cross-saturation effects between the d- and q-axes affecting both flux linkages...
This paper presents how to analytically design a high-torque three-phase flux-switching permanent magnet machine with 12 stator poles and 14 rotor poles. Firstly, the machine design parameters are studied addressing on high output torque and its flux distribution is also investigated by finite-element method (FEM) analysis. Then a simplified lumped parameter magnetic circuit model is built up for...
Measurement and determination of parameters of single-phase induction machines is quite a difficult task in comparison with symmetrical three-phase induction machines. This paper describes three different methods for parameter determination of single-phase machines. Conventional (classical) method, usually used for three-phase machines, is complemented by Suhr's and two-phase method. Furthermore,...
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...
A limited short circuit current PM motor is studied based on the segmentation of the rotor magnets. The principle is to reduce the magnetic flux by means of magnets subdivision and an increase of rotor pole number. The effect of magnet segmentation on machine characteristics is analyzed using finite element method (FEM). The short circuit current of designed fault tolerant machine is well limited...
In order to improve the wind energy utilization factor of wind-power generation system, a new type of Permanent Magnet Synchronous Generator(PMSG) with Opposite-rotation Dual Rotors(ODR) has been proposed in this paper, mechanical structure and operation mechanism have been discussed. Magnetic field has been analyzed by FEM and circuit method. Magnetic flux, flux density and EMF are calculated to...
In this work is presenting a reactive homo-heteropolar brushless synchronous machine (RHHBSM), with stator excitation destined to operate as low power generator in hydroelectric, or wind power stations, or as servomotor with reduced inertia. We proposed in this paper a modeling and a simulation method by electric-magnetic coupled network, based on the permeance network, 3D analysis with a specialized...
In order to improve operation performance of underwater vehicle anti-rotation propulsion system, a novel PMSM with Anti-rotation Dual rotor is proposed. It can be substantially simplify system structure, decrease volume and cost, moreover, improve reliability without brush and slip-ring. After the principles of operation, structure, and features are discussed, Design methodology is given. Both the...
This paper reports the design, performance analysis, and prototype experiment of a three-dimensional (3D) flux permanent magnet claw-pole motor (PMCPM), which has claws in the stator and the out rotor with permanent magnet, and the claws are made of soft magnetic composites (SMC). The effect of the number of poles, main dimensions, magnet material and dimensions and claw angle on the motor's performance...
This paper describes a mathematical model to determine the equivalent circuit parameters of Axial Flux Disc Machines (AFDMs) of whatever configuration. Once fixed the dimensions of the machine (magnet width, winding lengths, axial thickness, etc.), the equivalent inductance and resistance and finally the current are calculated, for a generator operation mode. The model has been implemented in a software...
A new double meshing gear motor was researched. The aim of this research is to design a new motor used in robot or micromechanics which integrates the reduction gear into the motor. Compared with conventional motors, the noticeable features of this motor are short drive chain, high respond speed, stability at low speed, big output torque. In this paper, the operation principle and mechanism characteristics...
This paper presents the analysis of rotor asymmetry, caused by broken bars, and their effects on the stator current of an induction machine under unbalanced supply voltage. The simulation of the induction machine is based on the finite element method. Experimental tests corroborate with the simulation results.
In this work is presenting a reactive homopolar synchronous machine with stator excitation (RHSMSE) destined to operate as generator of low and middle power or as servomotor with reduced inertia and high-speed. We proposed in this paper a modeling and a simulation method by electric-magnetic coupled network, based on the permeance network and 3D FEM analysis with specialized software. In this paper...
In switched reluctance machine (SRM), the power density can be increased by using full pitched winding instead of concentrated winding. It is reported that full pitched segmented switched reluctance machine (SSRM) can give 40% higher torque than conventional SRM for the same frame size. In this paper, it is shown that SSRM can give approximately double the torque for the same frame size. This is because...
Aim of the paper is to propose an analytical procedure that can be employed during the sizing of the synchronous reluctance motor with ldquoflux barriersrdquo rotor for motor performance prediction and could represent an alternative to the Finite Element approach. The procedure allows to evaluate the total MMF along direct d and quadrature q axes; the d-q magnetic circuits have been divided in several...
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