Salvatore N., Cascella G.L., Cascella D., Stasi S.
 

This paper appears in: IEEE Industrial Electronics, IECON 2006 - 32nd Annual Conference on
Issue Date: 6-10 Nov. 2006
On page(s): 1487 - 1492
Location: Paris
ISSN: 1553-572X
Print ISBN: 1-4244-0390-1
INSPEC Accession Number: 9441777
Digital Object Identifier: 10.1109/IECON.2006.348064
Date of Current Version: 16 April 2007

ABSTRACT

This paper focuses on a simple method of achieving optimal transient torque responses in indirect rotor flux orientation (IRFO) control of induction motors having skewed rotor bars. When the rotor bars are skewed, the q-axis stator current component produces its own field which is in the direction of the rotor field due the d-axis stator current component in one-half rotor, but in opposition to the rotor field in the other half. The distortion due to iron saturation causes the loss of both rotor flux, and, consequently, torque when an abrupt load is applied and/or a rapid speed change is required. The magnetizing rotor current has to be increased to compensate the flux loss and to improve the drive dynamics. The proposed method consists in a simple correction to the standard slip frequency calculator of the IRFO control scheme. Experimental results are presented to show the loss of flux and torque due to the skew effect and the effectiveness of the corrected slip frequency calculator