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:
May. 28, 2019
Filed:
Jun. 12, 2018
Fanuc Corporation, Yamanashi, JP;
Tsutomu Nakamura, Yamanashi, JP;
Satoshi Ikai, Yamanashi, JP;
Fanuc Corporation, Osaka, JP;
Abstract
A motor controller which controls a servo motor for driving a machine, includes: a speed command unit which commands the speed of the machine; a speed detection unit which detects the speed of the servo motor; and a speed control unit which produces a torque command based on a speed command and a motor speed detected so as to control the speed of the servo motor, where the speed control unit includes a filter which approximates the inverse characteristic of a transmission characteristic from the servo motor to the machine, the filter has a transmission characteristic F(s) based on a frequency ω, a vibration damping coefficient ζ and a cutoff frequency ωwhich are adjustment parameters and the frequency ω is adjusted so as to be equal to or more than an antiresonant frequency ωof the machine but less than a resonant frequency ω.