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Study of the variation of the input impedance of induction machines with frequency

Potter, B. A., Shirsavar, S. A. and McCulloch, M.D. (2007) Study of the variation of the input impedance of induction machines with frequency. IET Electric Power Applications, 1 (1). pp. 36-42. ISSN 1751-8660

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To link to this item DOI: 10.1049/iet-epa:20050524


The results of a study of the variation of three-phase induction machines' input impedance with frequency are proposed. A range of motors were analysed, both two-pole and four-pole, and the magnitude and phase of the input impedance were obtained over a wide frequency range of 20 Hz-1 MHz. For test results that would be useful in the prediction of the performance of induction machines during typical use, a test procedure was developed to represent closely typical three-phase stator coil connections when the induction machine is driven by a three-phase inverter. In addition, tests were performed with the motor's cases both grounded and not grounded. The results of the study show that all induction machines of the type considered exhibit a multiresonant impedance profile, where the input impedance reaches at least one maximum as the input frequency is increased. Furthermore, the test results show that the grounding of the motor's case has a significant effect on the impedance profile. Methods to exploit the input impedance profile of an induction machine to optimise machine and inverter systems are also discussed.

Item Type:Article
Divisions:Science > School of the Built Environment > Construction Management and Engineering
Science > School of the Built Environment > Energy and Environmental Engineering group
ID Code:5793
Uncontrolled Keywords:three-phase induction machine, motor testing, stator coil, three-phase inverter, multiresonant impedance profile, grounding
Publisher:Institution of Engineering and Technology

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