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Shaft Voltages in Induction Motor
Student: Thu Zar Kyaw
Supervisor: Allan Walton
Category: Engineering Thesis Project - Electrical
In recent years, the analysis of shaft voltages and the bearing currents in rotating machines have generated much interest in the field of electrical engineering. Past research showed different ways to detect shaft voltage and emphasized on On-Line monitoring systems to detect faults in the machines. In this thesis, the Rogowski coil technique has been applied to a 5.5kW squirrel cage induction motor to experiment on the measurement of shaft voltages. Results of the tests show the Rogowski coil correctly detects deliberately induced motor shaft current during calibration, but no motor shaft current is measurable during normal motor operation.
This thesis also revises on the potential sources of shaft voltages and their effects on bearings. In order to determine whether a machine has a shaft voltage problem or the potential for problems, it is important to review the damage types as well as the four potential sources. Finally, this thesis discusses the various methods used to minimize the effects of shaft voltages.