Design considerations for permanent magnet synchronous motors for flux weakening applications

Author

Ionel, D.M. ; Eastham, J.F. ; Miller, T.J.E. ; Demeter, E.

Author_Institution

Dept. of Electron. & Electr. Eng., Glasgow Univ., UK

Volume

145

Issue

5

fYear

1998

fDate

9/1/1998 12:00:00 AM

Firstpage

435

Lastpage

440

Abstract

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

Keywords

air gaps; demagnetisation; finite element analysis; inductance; machine protection; machine theory; magnetic flux; permanent magnet motors; power factor; rotors; synchronous motors; torque; air-gap length; control characteristics; d-axis inductance; design procedure; electromagnetic loading; finite element computations; flux weakening applications; linear dq model; permanent demagnetisation protection; permanent magnet synchronous motors; power factor; q-axis inductance; rotor configuration; sizing state; torque; unconventional motor constructions; very large power-speed range;

fLanguage

English

Journal_Title

Electric Power Applications, IEE Proceedings -

Publisher

iet

ISSN

1350-2352

Type

jour

DOI

10.1049/ip-epa:19982171

Filename

725623