JOURNAL OF JAPANESE SOCIETY OF TRIBOLOGISTS
Online ISSN : 2189-9967
Print ISSN : 0915-1168
ISSN-L : 0915-1168
Volume 58 , Issue 1
Special Issue on Sports and Tribology (Part 3)
Showing 1-14 articles out of 14 articles from the selected issue
Announcement
Contents
Foreword
Serial Messages to Tribologists
Special Issue on Sports and Tribology (Part 3)
Explanation
Essay The Tribo-Soshi, Essays from Tribologists
Original Contribution
  • ―Influence of the Surface Roughness of the Bearing Inner Ring and Outer Oing―
    Yoshinori ISOMURA, Tatsuo MAETANI, Akihiko WATANABE, Keisaku NAKANO, H ...
    2013 Volume 58 Issue 1 Pages 46-51
    Published: January 15, 2013
    Released: January 30, 2019
    JOURNALS FREE ACCESS

    A potential difference called the shaft voltage of brushless DC motors driven by PWM inverter is generated between the inner race and outer race of bearing due to inverter switching, and the voltage causes grease on the ball bearing to be dielectrically broken down, making current run between the inner race and outer race. As a result, electrical pitting is generated. In small ball bearings for air conditioning at the voltage endurance test of electrical pitting, the value of oil film parameter that is large enough to be abnormal has been reported in the past. In this paper, we proposes the brushless DC motor structure (We termed as the insulated rotor) for air conditioning which reduces the shaft voltage and an electric discharge phenomenon is not produced, and we verify the surface roughness of the inside of a bearing with paying attention to the influence of the oil film parameter in the proposal specification.

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