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MIXED-FREQUENCY TESTING OF INDUCTION MACHINES USING INVERTERS
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| Author(s) |
I. Colak; S. Garvey; M. T. Wright |
| Abstract |
An inverter can be used to supply a voltage waveform containing more than one frequency component to an induction machine in order to cause full-load currents to flow in the conductors of both the rotor and stator. Unlike the usual mixed-frequency test where (typically) a 0.1 p.u. sinusoidal voltage at 40 Hz is superimposed on a 1.0 p.u. sinusoidal voltage at 50 Hz to supply the machine, the use of an inverter allows the machine tester to have relatively comprehensive control over various quantities which determine the rate at which power is dissipated inside the induction machine. In particular, though conventional practice can cause the correct r.m.s. currents to flow in the stator conductors, it is not generally possible to also ensure that other losses are the same in the mixed-frequency test as they would be during full-load operation of the machine. This paper reports the use of a digital simulation of the induction machine and inverter system to investigate the effects of different possible forms of the mixed-frequency test using an inverter supply. The model used for the induction machine simulation is a phase equation model which has been accelerated by a method developed by the authors. |
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| Filename: | Unnamed file |
| Filesize: | 3.852 MB |
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| Type |
Members Only |
| Date |
Last modified 2019-05-21 by System |
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