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. 25, 2003
Filed:
Nov. 14, 2001
Mikio Kajiwara, Sakai, JP;
Ryohei Deguchi, Sakai, JP;
Nobuhiro Nojima, Sakai, JP;
Keiji Komori, Sakai, JP;
Kazuo Ida, Kusatsu, JP;
Masatoshi Hirano, Kusatsu, JP;
Daikin Industries, Ltd., Osaka, JP;
Abstract
A high-pressure, dome-type compressor includes a DC motor having a rotor that uses a rare earth/iron/boron permanent magnet having an intrinsic coercive force of 1.7 MA.m or greater in a rotor thereof and has a rated output or 1.9 kW or higher. The motor, which drives a compression element in a casing , is disposed in a high pressure, high temperature area , which is filled with gas discharged from the compression element. An inverter controls current supplied to the motor such that the motor temperature becomes equal to or less than a predetermined temperature and an opposing magnetic field generated in a stator has a predetermined strength or less. Since the magnet does not reach a high temperature and is not exposed to a strong opposing magnetic field, it is hardly demagnetized. As a result, performance of the motor and of the compressor is stable.