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. 04, 2021
Filed:
Mar. 30, 2020
Canon Kabushiki Kaisha, Tokyo, JP;
Yuta Nito, Matsudo, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A motor control device includes a phase determiner, a detector, and a controller configured to control the driving current so that a deviation between a value of a torque current component of the driving current detected by the detector and a target value of the torque current component is reduced, and perform field weakening for weakening an intensity of magnetic flux through the winding. In a state where a value corresponding to a rotational velocity is greater than a first predetermined value, the controller sets a degree of the field weakening to a first degree in a case where the value of the torque current component is greater than a second predetermined value, and sets the degree of the field weakening to a second degree smaller than the first degree in a case where the value of the torque current component is smaller than the second predetermined value.