A new analytical method for the computation of air-gap reactances in 3-phase induction motors

Author

Ionel, Dan M. ; Cistelecan, Mihai V. ; Miller, Timothy J E ; McGilp, Malcolm I.

Author_Institution

SPEED Lab., Glasgow Univ., UK

Volume

1

fYear

1998

fDate

12-15 Oct. 1998

Firstpage

65

Abstract

The method presented in the paper includes a generalized analysis of the air-gap MMF based on the equivalent linear current density at the slot opening. A detailed nonlinear magnetic circuit model of the motor cross-section geometry is excited with the fundamental MMF, solved in polar coordinates and the results used to calculate the magnetizing reactance. The contribution of all the air-gap MMF harmonics, apart from the electric fundamental, is added in order to compute the differential leakage reactance. The method has been implemented on computer and has provided better results than some of the classical methods on several test motors.

Keywords

air gaps; electric reactance; harmonics; induction motors; machine theory; magnetic circuits; 3-phase induction motors; air-gap MMF harmonics; air-gap reactances; differential leakage reactance; equivalent linear current density; magnetizing reactance; motor cross-section geometry; nonlinear magnetic circuit model; polar coordinates; slot opening; Air gaps; Conductors; Current density; Geometry; Induction motors; Laboratories; Magnetic analysis; Magnetic circuits; Performance analysis; Solid modeling;

fLanguage

English

Publisher

ieee

Conference_Titel

Industry Applications Conference, 1998. Thirty-Third IAS Annual Meeting. The 1998 IEEE

Conference_Location

St. Louis, MO, USA

ISSN

0197-2618

Print_ISBN

0-7803-4943-1

Type

conf

DOI

10.1109/IAS.1998.732260

Filename

732260