Bearing currents and their relationship to PWM drives

Journal Article · Sat Mar 01 00:00:00 EST 1997 · IEEE Transactions on Power Electronics

DOI:https://doi.org/10.1109/63.558735· OSTI ID:490904

Busse, D; Erdman, J; Kerkman, J; Schlegel, D; Skibinski, G ^[1]

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1. Rockwell Automation-Allen Bradley Co., Mequon, WI (United States)

This paper examines ac motor shaft voltages and the resulting bearing currents when operated under pulse width modulation (PWM) voltage source inverters. The paper reviews the mechanical and electrical characteristics of the bearings and motor in relation to shaft voltages and bearing currents. A brief review of previous work is addressed, including the system model and experimental results. The theory of electric discharge machining (EDM) is presented, including component calculations of the system elements. The effect of system elements on shaft voltages and bearing currents are evaluated experimentally and the results compared to theory. A design calculation is proposed that provides the relative potential for EDM. Finally, the paper will present quantitative results on one solution to the shaft voltage and bearing current problem.

• OSTI ID: 490904
• Journal Information: IEEE Transactions on Power Electronics, Vol. 12, Issue 2; Other Information: PBD: Mar 1997
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
BEARINGS
ELECTRIC MOTORS
ELECTRIC CURRENTS
POWER SUPPLIES
FREQUENCY DEPENDENCE
ELECTRICAL PROPERTIES