Title: Creeping discharge and partial discharge prevention means for a coil end of a rotary electric machine

Abstract: A creeping discharge and partial discharge-prevention means for a stator coil end of a rotary electric machine is disclosed. It includes an grounding electrode on an insulator of the stator coil end of the rotary electric machine, a first electrical stress grading coated layer on the insulator of the coil end including the end of the grounding electrode, a shield insulator made of insulation material around the first electrical stress grading coated layer including the end of the grounding electrode, a shield electrode electrically connected to the grounding electrode around the shield insulator, and a second electrical stress grading coated layer coated on the shield insulator including the end of the shield electrode.

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Inventors: Kawakami, Takeshi (Amagasaki, JA)
Tani, Tsutomu (Amagasaki, JA)
Ishikawa, Takatoshi (Amagasaki, JA)
Hirabayashi, Syoji (Amagasaki, JA)

Application Number: 557910
Filing Date: 1975-03-13
Publication_date: 1976-08-17
Assignee: Mitsubishi Denki Kabushiki Kaisha (Tokyo, JA)
Primary Class(es): 310/196 174/73.1, 174/127, 310/256
Other Classes:
US Patent Ref:

1784997	Dec, 1930	Schenkel	174/73.
3210460	Oct, 1965	Suelmann	174/73.
3508096	Apr, 1970	Kull et al.	310/196.
3631519	Dec, 1971	Salahshourian	174/127.

Other Refs: 741,239

Nov, 1943	DD

Primary Examiner: Duggan, Donovan F.
Assistant Examiner:
Attorney: Oblon, Fisher, Spivak, McClelland & Maier