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:
Jun. 24, 2008
Filed:
Jul. 24, 2003
Takeshi Hikawa, Sakai, JP;
Toshiyuki Maeda, Kusatsu, JP;
Shinichi Kasahara, Sakai, JP;
Takahiro Yamaguchi, Sakai, JP;
Shigenobu Izumi, Kusatsu, JP;
Kiyoshi Koizumi, Sakai, JP;
Masanobu Kita, Kusatsu, JP;
Takeshi Hikawa, Sakai, JP;
Toshiyuki Maeda, Kusatsu, JP;
Shinichi Kasahara, Sakai, JP;
Takahiro Yamaguchi, Sakai, JP;
Shigenobu Izumi, Kusatsu, JP;
Kiyoshi Koizumi, Sakai, JP;
Masanobu Kita, Kusatsu, JP;
Daikin Industries, Ltd., Osaka, JP;
Abstract
An instantaneous current and instantaneous voltage of a three-phase coil of a brushless DC motor are detected, and the internal condition of a compressor is predicted from these detection values. The prediction about the internal condition of the compressor is made in such a way that motor driving torque which is a parameter of a motor model is identified and poor lubrication, liquid compression or the like is predicted from this identified motor driving torque. This enables it to make, in real time, a failure forecast, failure diagnosis etc. on the compressor.