Title :
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
fDate :
9/1/1998 12:00:00 AM
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;
Journal_Title :
Electric Power Applications, IEE Proceedings -
DOI :
10.1049/ip-epa:19982171
