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:
Aug. 02, 2022
Filed:
Feb. 19, 2019
Hitachi Automotive Systems, Ltd., Hitachinaka, JP;
Kaito Hotta, Tokyo, JP;
Wataru Hatsuse, Tokyo, JP;
Masaki Koyama, Tokyo, JP;
Tsutomu Ito, Hitachinaka, JP;
Yoshinori Kawai, Hitachinaka, JP;
HITACHI ASTEMO, LTD., Hitachinaka, JP;
Abstract
Provided are a linear compressor and a linear compressor control system that do not require a sensor for detecting a position of a mover, and can compute a mover position with high accuracy, in consideration of position dependency of an induced voltage constant. A linear compressorincludes a field elementhaving a first end connected to elastic bodies (and) and including a permanent magnet, an armaturehaving a windingwound around a magnetic pole, and a linear motorthat causes the field elementand the armatureto reciprocate relatively in an axial direction. A stroke of a piston is controlled so that a portion where a gradient of an induced voltage when the induced voltage computed on the basis of a voltage command value output to the linear motorand a value of a current flowing through the windingis at a predetermined value is within a predetermined range corresponds to a top dead center and/or a bottom dead center of a stroke of a pistonconnected to a second end of the field element