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. 22, 2005
Filed:
Dec. 13, 2004
Atsuhiko Yokozeki, Shizuoka, JP;
Susumu Nakayama, Shizuoka, JP;
Kenji Tojo, Moriya, JP;
Akira Saruta, Chiba, JP;
Mutsunori Matsunaga, Shizuoka, JP;
Satoshi Kikuchi, Hitachi, JP;
Atsuhiko Yokozeki, Shizuoka, JP;
Susumu Nakayama, Shizuoka, JP;
Kenji Tojo, Moriya, JP;
Akira Saruta, Chiba, JP;
Mutsunori Matsunaga, Shizuoka, JP;
Satoshi Kikuchi, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A refrigerating machine having a compressor driven by a motor. The motor incorporates an armature with an iron core having a cage type conductor and a permanent magnet which is magnetized so as to enable the motor to operate as a synchronous motor. A bypass passage is provided between a discharge side of the compressor and a suction side of the compressor, a shut-off valve is provided for opening and closing the bypass passage, a pressure detecting device is provided for detecting a discharge pressure from the compressor and a current detector is provided for detecting a value of drive current for the compressor. The shut-off valve is opened and closed in accordance with the discharge pressure and the value of the drive current.