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:
Jan. 06, 2026
Filed:
Nov. 29, 2023
Sumitomo Heavy Industries, Ltd., Tokyo, JP;
Takaaki Morie, Yokosuka, JP;
SUMITOMO HEAVY INDUSTRIES, LTD., Tokyo, JP;
Abstract
A cryocooler includes an expander provided with an expander motor including a motor rotary shaft, a displacer that changes a volume of an expansion space of a working gas by reciprocating linearly by the motor rotation shaft rotating, and a rotary valve that controls intake and exhaust of the working gas into the expansion space by rotating by the motor rotation shaft rotating, a pressure sensor that measures a pressure of the working gas and outputs a measurement signal indicating the measured pressure, and a controller that receives the measurement signal, detects a feature point appearing periodically in the measured pressure during an operation of the cryocooler, acquires a motor drive waveform indicating a command rotation speed of the motor rotary shaft determined to vary within one rotation of the motor rotary shaft, and outputs the motor drive waveform in synchronization with the feature point appearing periodically.