Induction Motor Equivalent Circuit Including the Stray Load Losses in the Machine Power Balance

• Published in: IEEE transactions on energy conversion Vol. 23; no. 3; pp. 796 - 803
• Main Authors: Boglietti, A., Cavagnino, A., Ferraris, L., Lazzari, M.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.09.2008; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Circuit testing; Direct power generation; Equivalent circuit; Equivalent circuits; Friction; Guidelines; Impedance; Induction motors; Iron; Loss measurement; Mathematical models; parameter identification; Power system harmonics; Rotors; Squirrel cage; Stator cores; Stators; Stray load losses; total enclosed fan cooled (TEFC) induction motors; stray load losses; total enclosed fan cooled (TEFC) induction motors; Equivalent circuit; parameter identification
• ISSN: 0885-8969; 1558-0059
• DOI: 10.1109/TEC.2008.921467

In this paper, the stray load losses due to the air gap spatial harmonics effects on the rotor squirrel cage are considered and a simplified induction motor equivalent circuit able to include them in the machine power balance is reported. In the proposed model, an additional resistance appears in series with the stator impedance. This additional parameter has been defined on the basis of power balance considerations applied to the induction motor classical theory. The complete theoretical analysis together with the guidelines to measure the equivalent circuit parameters are reported in detail. Finally, the proposed approach has been experimentally verified using five total enclosed fan cooled induction motors.