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. 27, 2016
Filed:
Dec. 09, 2013
Brushless motor control method and brushless motor control device and electric power steering device
Mitsuba Corporation, Gunma, JP;
Masayuki Okubo, Gunma, JP;
Keisuke Mitsuoka, Gunma, JP;
Mitsuba Corporation, Gunma, JP;
Abstract
A control devicethat drives and controls a brushless motorof a four-pole 24-slot configuration includes: a base current calculation sectionthat calculates fundamental-wave current indicating a winding current value associated with maximum torque control; a correction component calculation sectionthat calculates 12-order first higher harmonic wave component B sin 12(θ+β) to cancel a torque ripple of magnet torque, and 12-order second higher harmonic wave component A sin 12(θ+α) to cancel a torque ripple of reluctance torque, based on a phase current value detected by a current sensor; a correction mapin which relation between phase current and parameters A, B, α, and β of the both higher harmonic wave components is stored; and a current correction sectionthat corrects supply current by superimposing each 12-order higher harmonic wave component on the fundamental-wave current in order to create current command values Id' and Iq′.