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Comparison of stray load and inverter-induced harmonic losses in induction motors using calorimetric and harmonic injection methods

Lookup NU author(s): Dr Wenping Cao

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Abstract

This paper addresses two types of additional losses in induction motors. One is stray load loss resulting from loss segregation when induction motors operate from a sinusoidal supply voltage and the other is harmonic loss when induction motors operate from inverter-fed supply voltage. Both losses are of concern in machine design and operation but they are difficult to predict accurately without the use of empirical factors. This is due to their complex loss mechanisms and small magnitudes relative to output power for high efficiency machines. Compared to total machine power loss, however, they are a significant source of loss. Investigation into the correlation of the two loss components could enable effective quality control of the manufacturing of machines for use on inverter supplies. With the availability of advanced calorimetric and harmonic injection techniques, it becomes possible for these small loss components to be measured with precision. In this paper, seven induction motors ranging in power through 1.1, 7.5, 15 to 30 kW are tested for experimental comparison. Among these are four 7.5 kW machines. Test results suggest there is a need for induction motors designed specifically for inverter-fed operation.

Publication metadata

Author(s): Cao W, Bradley KJ, Clare JC, Wheeler PW

Publication type: Article

Publication status: Published

Journal: IEEE Transactions on Industry Applications

Year: 2010

Volume: 46

Issue: 1

Pages: 249-255

Date deposited: 13/08/2010

ISSN (print): 0093-9994

ISSN (electronic): 1939-9367

Publisher: IEEE

URL: http://dx.doi.org/10.1109/TIA.2009.2036675

DOI: 10.1109/TIA.2009.2036675

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