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:
May. 10, 2005
Filed:
Jul. 24, 2003
Applicants:
Kaname Sasaki, Kashiwa, JP;
Hiroaki Doi, Tsuchiura, JP;
Haruki Hamada, Naka, JP;
Masaaki Hayashi, Hitachinaka, JP;
Ryuichi Saito, Hitachi, JP;
Inventors:
Kaname Sasaki, Kashiwa, JP;
Hiroaki Doi, Tsuchiura, JP;
Haruki Hamada, Naka, JP;
Masaaki Hayashi, Hitachinaka, JP;
Ryuichi Saito, Hitachi, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F25D023/12 ;
U.S. Cl.
CPC ...
Abstract
A cooling system for a motor is prevented from exhibiting a thermal fatigue failure due to a temperature cycle. The operation or stopping of the cooling motor fanof the forced cooling system is controlled using the difference between the temperature thereof and the operation start temperature Tis of the power converter. Thus expansion of the temperature range is suppressed.