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:
Feb. 05, 2019
Filed:
Feb. 05, 2018
Mitsubishi Electric Corporation, Tokyo, JP;
Mitsubishi Electric Corporation, Tokyo, JP;
Abstract
In a control device for an electric motor (), a three-phase/two-phase conversion section () outputs N d-axis current values and N q-axis current values in each measurement period that is 1/N of a carrier period. An average value calculation section () calculates average values of those values. A difference calculation section () calculates a difference between a k-th d-axis current value and the average value of the d-axis current values as a d-axis current difference, and calculates a difference between a k-th q-axis current value and the average value of the q-axis current values as a q-axis current difference. A filtering section () performs low-pass filtering on each difference, and outputs d-axis and q-axis current correction values. A correction calculation section () performs a linear operation of each k-th current value and the corresponding current correction value, and outputs the corrected current values.