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L. Chang A. R. Eatham G. E. Dawson Department of Electrical Engineering Queen's University |
Permanent Magnet Synchronous Motor: Finite Element Torque CalculationsVarious calculation methods based on finite element (FE) analysis have been previously been developed for electric machines. The Maxwell stress tensor method has been modified by the authors to yield an area of integration which takes into account the field of distribution in the airgap of a machine, resulting in an improvement in accuracy and the elimination of sensitivity to contour selection. A second technique, based on the co-energy derivative method, has also been developed. This needs only one FE solution and eliminates the trial-and-error procedure of selecting a proper displacement for the derivative determination thus shortening the computational time. The torque characteristics of a permanent magnet synchronous motor (PMSM) evaluated from the above methods compare favourably with each other as well as with those from the Lorentz method and an analytical model based on an equivalent circuit of the machine. The torque calculating techniques are used to select the geometry of the permanent magnets for the rotor of a 30hp machine using a criteria which takes into account the torque per unit stator current, efficiency-power factor product, overload capability of the machine, and the volume (cost) of permanent magnet material. |
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