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. 13, 2010
Filed:
Oct. 26, 2006
Shuji Endo, Gunma, JP;
Hideyuki Kobayashi, Gunma, JP;
Shuji Endo, Gunma, JP;
Hideyuki Kobayashi, Gunma, JP;
NSK Ltd., Tokyo, JP;
Abstract
There is provided a controller for an electric power steering apparatus having a motor which applies a steering assist force to a steering mechanism. The controller includes a torque command value calculating portion which calculates a torque command value based on steering torque generated in a steering shaft, and a vehicle speed and a current command value calculating portion which calculates a current command value for the motor based on the torque command value. The controller controls the motor based on the current command value. In the apparatus, the controller has a cogging torque compensation value calculating portion which calculates a cogging torque compensation value for the motor, and corrects the current command value based on the cogging torque compensation value.