The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 13, 2001
Filed:
Apr. 20, 2000
Akitomi Semba, Hitachi, JP;
Tadashi Sonobe, Iwaki, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An air ventilation hole provided on a creepage block and an air ventilation hole provided on a rotor winding, and having a different shape than the air ventilation hole provided on the creepage block communicate smoothly with an air ventilation hole provided on the most outer diameter turn of the rotary winding, which is in contact with the creepage block of the rotor winding. Accordingly, the withstand pressure of the creepage block can be maintained fully and also the flow of a cooling air flowing in a radial direction to the rotor winding, the creepage block, and a wedge can be formed smoothly. As a result, the cooling air can be increased and a heat exchange having a good efficiency can be carried out. Accordingly, the cooling performance of the rotor winding can be heightened and the creepage block can be formed with a high reliability against centrifugal force.