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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 presents the design considerations of a five-phase outer rotor interior permanent magnet motor (IPM) for an electric bicycle (e-bicycle). Conventional e-bicycles employ three phase outer rotor surface permanent magnet motors which are less reliable compared to the five-phase IPM motors. Moreover, the traditional electric motors use rare-earth permanent magnet materials such as neodymium...
This paper presents the design of a transverse flux reluctance machine with mutual flux paths without considerable coupling between neighboring phases. It also discusses further design improvements, which effect power density and/or efficiency. Thereby the practical limits are mentioned.
The magnetic circuit of transverse flux reluctance machines causes magnetic flux in three spatial directions. 3-D FEM can be used designing the magnetic circuit, but it requires a relatively long computation time. Therefore 3-D FEM is not useful for an optimization tool. This paper compares four much faster design methods: A simple analytical approach, a magnetic equivalent network, a modified 2-D...
This paper is related to the French project TRAX, whose aim is to develop a new direct drive electric motorization for "all electric" vehicles. The final objective of this project is to develop an innovative motorization industrially feasible for massive production. In this context, we have proposed to design an original axial flux permanent magnet motor with using an Analytical Model (AM)...
This paper is about an analytical computation method for a transverse flux permanent magnet excited machine. The analytical computation method makes use of a magnetic equivalent circuit with lumped elements considering saturation. The magnetic values of the magnetic equivalent circuit are solved via nodal analysis. Having the entire magnetic equivalent circuit of one pole pair of the transverse flux...
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...
This paper presents challenges in an ongoing project related to the design of a premium efficiency three-phase line start permanent magnet synchronous motor (LSPMSM) and proposes an exclusive solution through development of a novel magnetic circuit model. Since the LSPMSM is rapidly replacing the conventional induction motors in industrial applications such as pumps, fans and conveyors which require...
In this paper an algorithm for non-linear magnetic analysis of surface-mounted permanent-magnet machines is presented. It is based on the equivalent magnetic circuit method and can be used as a useful design and computing tool. The duplication of an elementary cell of the machine allows building whatever typology of windings and ampere-turns distribution in a pole pair. The direct modification of...
In this paper, a new methodology for designing an electrical machine is proposed. Preliminary physical dimensions for the machine to be designed are obtained with the use of analytical equations. Then, the machine is realized by a Magnetic Equivalent Circuit (MEC) for accurate analysis. Thus, with the aid of MEC, quick convergence to the optimal machine design on different fronts like losses, cost,...
With the widely used of permanent magnet synchronous motor (PMSM), it is required to have a higher performance. Improving the key parameters of permanent magnet synchronous motor is the main way to optimize the design. As the reactance parameters are the important basis for the design of permanent magnet synchronous motor, the reactance parameters are analyzed in this paper. The reactance parameters...
A novel radial translational meshing gear motor was introduced. The aim of this research is to design a new motor used in robot, micro mechanics and other devices with space restrict which integrates the meshing gear into the motor. Compared with conventional motors, the noticeable features of this motor are that the direction of electromagnetism force driving rotor is along radial direction, which...
Rational utilization of reluctance torque can effectively improve torque performance and speed range in constant power region of interior permanent magnet(IPM) electric machines, thereby affecting dynamic performance of HEVs. This paper presents a reluctance torque analysis method on the basis of calculating the torque-power angle characteristic curve in advantage of FEM. Moreover, the direct(d) and...
A novel brushless compound-structure permanent-magnet synchronous machine (CS-PMSM) is proposed in this paper. The structural characteristics are described and the operation principle is introduced. The equivalent magnetic circuit of the BDRM is established, and the electromagnetic torque is deduced by analytical method. The new type of brushless CS-PMSM consists of one stator machine (SM) and one...
Computationally Efficient - Finite Element Analysis (CE-FEA) is detailed and demonstrated on a design optimization study for a sine-wave current regulated Interior Permanent Magnet (IPM) machine. In CE-FEA symmetries of electric and magnetic circuits of AC machines are fully exploited to minimize the number of required magnetostatic solutions. CE-FEA employs Fourier analysis and is capable of accurately...
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...
Design and development of electrical machines require a good accuracy model with a low time process. Compared to finite element analysis and analytical model magnetic Equivalent Circuit (MEC) presents compromise between time process and accuracy. This paper presents two MEC method used to modeling a unipolar permanent magnet synchronous machine (PMSM) (only one permanent magnet per pole pair). Average...
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...
This paper presents the optimal design of an 18-slot 8-pole double-stator permanent magnet brushless (DS-PMBL) machine. The key is to optimize the split ratio, namely the ratio of the inner-stator outside diameter to the outer-stator outside diameter, to achieve the maximum torque density under the same copper loss. Both the finite element analysis and experimental results are given to verify the...
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