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:
Oct. 25, 2011
Filed:
Jun. 11, 2009
Yasuyuki Takei, Fukuoka, JP;
Yasuyuki Takei, Fukuoka, JP;
Kabushiki Kaisha Yaskawa Denki, Fukuoka, JP;
Abstract
A motor controller supplies power to a motor and drives the motor, the motor including a position detector. The motor controller includes a velocity control unit which generates a torque instruction by using a velocity instruction and a velocity signal; a correction processing unit which Fourier-transforms the torque instruction, extracts first-, second-, and sixth-order frequency components from the Fourier-transformed torque instruction, extracts an order component having the largest spectrum from the extracted order components, and generates a sine wave correction signal; an adder which adds the sine wave correction signal to the torque instruction, and generates a new torque instruction; and a position-signal generation unit which generates a position signal by using a position detection signal of the position detector.