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Among various types of motors, Permanent Magnet (PM) motors, due to their high energy density are mainly used for electric based propulsion systems. In this paper an improved analytical model for PM motor has been presented. The model takes into account important factors such as, armature reaction, slotting effect and influence of non-linear material property on motor's behavior. Moreover, the main contributions of this work is representation of stator windings with exact winding width using Fourier series and consideration of effects of non-linear ferromagnetic material property. Using this model it is possible to determine air-gap magnetic field, flux linkage, back emf, cogging torque and electromagnetic torque with high accuracy. Results from the proposed model are compared with other analytical model and also with those from finite element analysis (FEA). The results obtained from the proposed method match closely with the FEA.Index Terms-Analytical models, cogging torque, electric vehicle, magnetic field, permanent magnet. 0018-9464 (c)

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The use of multiobjective optimization technique in determining the values of the steady-state equivalent circuit parameters of a three-phase squirrel-cage induction machine is discussed. The identification procedure is based on the steady state phase current versus slip and torque versus slip characteristics. Nonlinearities in the Induction machine such as saturation effects and skin effects are also taken into account. The proposed technique is based on Multiobjective Genetic Algorithms (MOGA). The MOGA is used to minimize the error between the actual data and the data obtained by equivalent circuit. The robustness of the method is shown by identifying parameters of the induction motor in three different cases. The simulation results show that the method successfully estimates the motor parameters.

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This paper presents an analytical model for determining air-gap radial and tangential magnetic field in permanent magnet brushless dc (PMBLDC) motor. The solution is based on two-dimensional analysis in polar coordinates for radially magnetized magnet. Effects caused due to non-linear behavior of the stator ferromagnetic yoke are mainly considered. Radial and tangential magnetic field, back emf and cogging torque are calculated and are validated with finite element results. The finite element analysis demonstrates the accuracy of the developed analytical model of PMBLDC motor for no load magnetic field calculation.