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Identification and Discussion of the Origin of a Shaft End-to-End Voltage in an Inverter-Driven Motor

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2 Author(s)
Shami, U.T. ; Dept. of Electr. & Electron. Eng., Tokyo Inst. of Technol., Tokyo, Japan ; Akagi, H.

This paper addresses shaft end-to-end and shaft-to-frame voltages that appear in the 400-V 15-kW induction motor driven by a voltage-source pulsewidth modulation inverter. It has been known that an inverter-fed common-mode voltage causes both shaft voltages. Extensive experiments are performed with an ungrounded motor subjected to a differential-mode voltage. Experimental results show that the differential-mode voltage applied across three-phase, two-phase, or single-phase stator windings also causes a shaft end-to-end voltage. It is concluded that the combination of a steep change in differential-mode voltage and high-frequency motor asymmetry causes a shaft end-to-end voltage. A motor model is presented to explain the generation of shaft end-to-end voltage.

Published in:

Power Electronics, IEEE Transactions on  (Volume:25 ,  Issue: 6 )

Date of Publication:

June 2010

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