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Effect of PWM inverters on AC motor bearing currents and shaft voltages
Abstract
This paper investigates AC induction motor shaft voltage problems, current flow through motor bearings and electric discharge current problems within bearings when operated under both pure sinewave and pulse width modulated (PWM) inverter sources. Experience suggests that PWM voltage sources with steep wavefronts especially increase the magnitude of the above electrical problems, leading to motor bearing material erosion and early mechanical failure. Previous literature suggests that shaft voltage-bearing current problems under 60 Hz sinewave operation are predominantly electromagnetically induced. It is proposed that under PWM operation these same problems are now predominantly an electrostatic phenomenon. A system model to describe this phenomenon is characterized and developed. Construction and test of a new electrostatic shielded induction motor (ESIM) verifies this model and is also a possible solution to the bearing current problem under PWM operation.
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Cited by
Multilevel inverter modulation schemes to eliminate common-mode voltages
Wang, F., Wallace, A. K., Dai, S., Von Jouanne, A., & Zhang, H. (2000) · IEEE Transactions on Industry Applications · doi:10.1109/28.887217 · Cited by 474
Charge balance control schemes for cascade multilevel converter in hybrid electric vehicles
Tolbert, L. M., Peng, F. Z., Cunnyngham, T., & Chiasson, J. N. (2002) · IEEE Transactions on Industrial Electronics · doi:10.1109/tie.2002.803213 · Cited by 381
Electrical bearing failures in electric vehicles
He, F., Xie, G., & Luo, J. (2020) · Friction · doi:10.1007/s40544-019-0356-5 · Cited by 303
Multilevel inverters for electric vehicle applications
Tolbert, L. M., Peng, F. Z., & Habetler, T. G. (2002) · Power Electronics in Transportation (Cat. No.98TH8349) · doi:10.1109/pet.1998.731062 · Cited by 204
Metadata
- Authors
- Erdman, J. M., Kerkman, R. J., Schlegel, D. W., & Skibinski, G. L.
- Venue
- IEEE Transactions on Industry Applications
- Published
- 1996
- Volume
- 32
- Issue
- 2
- Pages
- 250-259
- ISSN
- 0093-9994 (ISSN-L)
- OpenAlex
- W2565537996
- Cited by
- 738
- References
- 0
- FWCI
- 11.65
- Type
- journal article
- Language
- en
- Open access
- closed
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- CoChat. (2026). Citation check: Effect of PWM inverters on AC motor bearing currents and shaft voltages. https://app.cochat.ai/papers/10.1109/28.491472
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- Erdman, J. M., Kerkman, R. J., Schlegel, D. W., & Skibinski, G. L. (1996). Effect of PWM inverters on AC motor bearing currents and shaft voltages. IEEE Transactions on Industry Applications. https://doi.org/10.1109/28.491472
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