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Design considerations for permanent magnet synchronous motors for flux weakening applications

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4 Author(s)
Ionel, D.M. ; Dept. of Electron. & Electr. Eng., Glasgow Univ., UK ; Eastham, J.F. ; Miller, T.J.E. ; Demeter, E.

The required parameter values of a permanent magnet synchronous motor designed for very large power-speed range are determined based on a linear dq model. It is shown that unconventional motor constructions with the d-axis inductance equal to, or bigger than, the q-axis inductance can provide superior torque, power factor and control characteristics. The initial sizing state of a design procedure is described. Analytical equations are developed and used to illustrate the influence of the rotor configuration, electromagnetic loading and air-gap length on the performance of a relatively large range of medium-sized motors. Suggestions regarding the improvement of efficiency, power factor, overload performance and PM protection against permanent demagnetisation are also given. The results of the analytical design procedure have been checked against finite element computations and experimental data

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Electric Power Applications, IEE Proceedings -  (Volume:145 ,  Issue: 5 )