Approaches to suppressing shaft voltage in brushless DC motor driven by PWM inverter

This paper describes the approaches to suppressing the shaft voltage and bearing current by electrostatically shielding the stator end windings of the brushless DC motor driven by PWM inverter. At first, measured shaft voltage and bearing current are compared with those calculated waveforms to verif...

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Bibliographic Details
Published in:Electrical engineering in Japan 2009-03, Vol.166 (4), p.73-79
Main Authors: Iimori, Kenichi, Shinohara, Katsuji, Yamamoto, Kichiro, Morigami, Atsushi
Format: Article
Language:English
Subjects:
bearing current
brushless DC motor
common mode equivalent circuit
shaft voltage
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Summary:This paper describes the approaches to suppressing the shaft voltage and bearing current by electrostatically shielding the stator end windings of the brushless DC motor driven by PWM inverter. At first, measured shaft voltage and bearing current are compared with those calculated waveforms to verify the common mode equivalent circuit of the brushless DC motor. Next, the relationship between shaft voltage and stator winding to rotor capacitance is calculated using the common mode equivalent circuit. Finally, the electrostatic shielding of the stator end windings is evaluated to reduce the shaft voltage by experiments and calculations. ©2008 Wiley Periodicals, Inc. Electr Eng Jpn, 166(4): 73–79, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/eej.20701
ISSN:0424-7760
1520-6416
DOI:10.1002/eej.20701