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:
Apr. 22, 2014
Filed:
Feb. 22, 2011
Yugo Tadano, Tokyo, JP;
Yugo Tadano, Tokyo, JP;
Meidensha Corporation, Tokyo, JP;
Abstract
A periodic disturbance observer determines real part I^and imaginary part I^of an estimated current including a periodic disturbance, from value of identification identifying a system transfer function of an nth order torque ripple frequency component from a command torque to a detected torque value, with a one-dimensional complex vector having a real part P^and an imaginary part P^, a cosine coefficient T, a sine coefficient T, and the real part P^and imaginary part P^of the system transfer function; subtracts command compensating current I* and I* obtained through pulsation extracting filter G, respectively, from the real part I^and imaginary part I^of the estimated current, and thereby determines estimated periodic disturbance current real part dI^and imaginary part dI^to cancel the periodic disturbance current.