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:
Sep. 25, 2018
Filed:
Sep. 15, 2016
Renesas Electronics Corporation, Tokyo, JP;
Minoru Kurosawa, Kodaira, JP;
Kichiya Itagaki, Kodaira, JP;
RENESAS ELECTRONICS CORPORATION, Tokyo, JP;
Abstract
The phase of a drive current of a motor is optimized. The phase arithmetic unit PHCAL calculates a drive voltage phase θdrv to converge the phase difference between the reference voltage phase θbemf and the reference current phase θi to zero based on a prescribed arithmetic expression. The phase correction unit PHCP determines the phase θdrvR after the correction by adding a correction value to the phase θdrv, and the magnitude of the correction value is updated by a feedback control so as to converge to a prescribed value the phase difference between the reference voltage phase θbemf and the reference current phase θi which are inputted. A PWM controller shifts an energization control timing synchronized with the reference voltage phase θbemf based on the corrected phase θdrvR, and generates the PWM signal for controlling the drive voltage to a sine wave shape.