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Bearing current pulse rate in standard PWM drives.
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| Author(s) |
A. Kempski; R. Strzelecki; R. Smoleñski; J. Bojarski; M. Klytta |
| Abstract |
This paper examines AC motor bearing currents (Electric Discharge Machining – EDM) resulting
from a common mode (CM) voltage in a drives fed by PWM voltage source inverters. Subject
literature of the problem of bearing currents has been primarily concerned with theoretical analysis of
bearing current phenomena and possible mechanisms for bearing damage [1-4]. It has been rarely
related to the quantitative results of the bearing currents appearance. However, it is a reasonable
assumption that an amplitude and the number of EDM current pulses in a duty cycle are the most
important rate–determining factors of premature bearing damage. In this paper we present the
experimental results of the distribution of an amplitude and a rate of bearing current pulses.
Parameters of the distribution have been also determined. They can be the basis of comparative
analysis of influence of the CM current mitigation methods on the risk of electrically induced bearing
damage. Especially, we focus on the improved systems with a CM choke and a CM transformer and
an active filter for the CM voltage cancellation. |
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| Filename: | EPE2001 - PP00488 - Smolenski.pdf |
| Filesize: | 810.3 KB |
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| Type |
Members Only |
| Date |
Last modified 2004-03-09 by System |
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