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US Patent 7898128 Forced cooling rotary electric machine

Patent 7898128 was granted and assigned to Hitachi on March, 2011 by the United States Patent and Trademark Office.

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Patent abstractTimelineTable: Further ResourcesReferences
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Patent
Patent
1

Patent attributes

Current Assignee
Hitachi
Hitachi
1
Patent Jurisdiction
United States Patent and Trademark Office
United States Patent and Trademark Office
1
Patent Number
78981281
Patent Inventor Names
Tadaaki Kakimoto1
Takashi Shibata1
Akitomi Semba1
Kenichi Hattori1
Mitsunori Sezaki1
Mitsuru Saeki1
Date of Patent
March 1, 2011
1
Patent Application Number
119727961
Date Filed
January 11, 2008
1
Patent Citations Received
‌
US Patent 12062948 Rotor for a rotary electric machine with angularly offset spacer plates
2
Patent Primary Examiner
‌
Quyen Leung
1
Patent abstract

The invention aims at providing a forced cooling rotary electric machine capable of bringing temperature distribution close to a designed temperature distribution and avoiding becoming a larger size, and employs a wedge formed with ventilation grooves and a wedge not formed with the ventilation grooves to regulate the flow rates of cooling gas passing through air ducts, so that the cooling gas supplied to a part of a stator core, in which temperature is low, can be caused to flow positively to a part in which the temperature is high and the temperature distribution in the axial direction of the stator core can be uniformized. As a result, the temperature distribution in the axial direction of the stator core can be brought close to a designed temperature distribution, and a forced cooling rotary electric machine that need not be made larger in size with a margin can be obtained.

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