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:
May. 28, 2019
Filed:
Oct. 27, 2016
Daikin Industries, Ltd., Osaka-Shi, Osaka, JP;
Minoru Kitou, Osaka, JP;
Nobuki Kitano, Osaka, JP;
Naoto Kobayashi, Osaka, JP;
Hiroshi Hibino, Osaka, JP;
Ryou Matsuyama, Osaka, JP;
DAIKIN INDUSTRIES, LTD., Osaka-Shi, JP;
Abstract
A subtractor subtracts an angular speed correction amount from a rotational speed command to obtain a corrected rotational speed command. An adder adds a second-axis current correction value to a γc-axis current to obtain a corrected second-axis current. An angular ripple extraction unit obtains, from a rotational angle on a mechanical angle of a synchronous motor, a rotational angle difference being a ripple component of the rotational angle. An n-order component extraction unit extracts n-order components of a fundamental frequency of the rotational angle from the rotational angle difference. A torque conversion unit obtains n-order components of an estimated value of vibration torque. A correction amount calculation unit obtains the second-axis current correction value using the n-order components.