An evaluation of the electrostatic shielded induction motor: a solution for rotor shaft voltage buildup and bearing current

This paper evaluates a new induction motor, the electrostatic shielded induction motor (ESIM). An ESIM reduces rotor shaft voltages to levels below the bearing lubricant's electric field intensity breakdown level and offers one solution to accelerated bearing wear caused by fluting induced by p...

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Bibliographic Details
Published in:IEEE transactions on industry applications 1997-11, Vol.33 (6), p.1563-1570
Main Authors: Busse, D.F., Erdman, J.M., Kerkman, R.J., Schlegel, D.W., Skibinski, G.L.
Format: Article
Language:English
Subjects:
Acceleration
Breakdown voltage
Electric breakdown
Electrostatics
Induction motors
Lubricants
Pulse inverters
Pulse width modulation inverters
Rotors
Shafts
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Summary:This paper evaluates a new induction motor, the electrostatic shielded induction motor (ESIM). An ESIM reduces rotor shaft voltages to levels below the bearing lubricant's electric field intensity breakdown level and offers one solution to accelerated bearing wear caused by fluting induced by pulsewidth modulated (PWM) inverters. The paper begins by reviewing shaft voltages and the resulting bearing currents when operated on PWM voltage source inverters. An example of bearing fluting is shown, and system models are presented and discussed. The construction details and test results for several ESIMs are presented. Experimental results show the ESIM solves the electrostatically induced rotor shaft voltage and bearing problem without degrading the electromagnetic performance of the motor.
ISSN:0093-9994
1939-9367
DOI:10.1109/28.649969