General theory of induction machines with unlaminated secondary and constant-current excitation

Author

Chalmers, B.J. ; El Attar, M.M.K.

Author_Institution

University of Manchester Institute of Science & Technology, Department of Electrical Engineering & Electronics, Manchester, UK

Volume

125

Issue

7

fYear

1978

fDate

7/1/1978 12:00:00 AM

Firstpage

666

Lastpage

670

Abstract

A general theory of induction machines with unlaminated secondary and constant-current excitation is presented, based on a previous treatment of such machines with constant-voltage supply. The results are presented in the form of generalised curves of nondimensional coefficients, which, in conjunction with simple scaling factors, enable the torque/speed characteristic of a given machine to be evaluated. A computational method is described for taking into account saturation in the magnetic circuit and the validity of the treatment is demonstrated by correlation with tests up to high levels of saturation. The results are particularly relevant to modern eddy-current machines such as dynamometers, brakes and couplings.

Keywords

asynchronous machines; eddy currents; machine theory; magnetic circuits; constant current excitation; eddy current machines; generalised curves; induction machines; magnetic circuit saturation; nondimensional coefficients; scaling factors; torque/speed characteristic; unlaminated secondary;

fLanguage

English

Journal_Title

Electrical Engineers, Proceedings of the Institution of

Publisher

iet

ISSN

0020-3270

Type

jour

DOI

10.1049/piee.1978.0156

Filename

5253010