Abstract
Bearing voltages and corresponding currents in electric machines driven by pulse width modulation (PWM) converters with fast switching and high dv/dt can cause premature bearing failures. This paper evaluates the bearing voltage reduction by using insulated shafts and bearings. An equivalent circuit representation of electric machines taking into account high-frequency effects is developed to show the production mechanism of bearing voltage, based on which simulations are performed with detailed finite element models for transient and simplified equivalent circuit for steady-state analysis. The steady-state equivalent circuit is then calibrated, by combined numerical calculations and experimental measurements, and used to predict the bearing voltage for various scenarios, proving the effectiveness of using insulated shaft and bearings in reducing the steady-state bearing voltage.
Original language | English |
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Title of host publication | ECCE 2020 - IEEE Energy Conversion Congress and Exposition |
Pages | 5584-5589 |
Number of pages | 6 |
ISBN (Electronic) | 9781728158266 |
DOIs | |
State | Published - Oct 11 2020 |
Event | 12th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2020 - Virtual, Detroit, United States Duration: Oct 11 2020 → Oct 15 2020 |
Publication series
Name | ECCE 2020 - IEEE Energy Conversion Congress and Exposition |
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Conference
Conference | 12th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2020 |
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Country/Territory | United States |
City | Virtual, Detroit |
Period | 10/11/20 → 10/15/20 |
Bibliographical note
Publisher Copyright:© 2020 IEEE.
Keywords
- Bearing current
- PWM converter
- bearing voltage
- capacitance
- electric machine
- insulated bearing
- insulated shaft
ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Mechanical Engineering
- Control and Optimization
- Energy Engineering and Power Technology