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:
Feb. 21, 2012
Filed:
Jan. 23, 2007
Wennong Zhang, Kitakyushu, JP;
Mitsujiro Sawamura, Kitakyushu, JP;
Yasuyuki Takei, Kitakyushu, JP;
Kabushiki Kaisha Yaskawa Denki, Kitakyushu-shi, JP;
Abstract
A servo control apparatus capable of suppressing adverse effects of disturbance, load variation and the like, and realizing robust and high-performance speed control. The apparatus includes both of the following observers: a disturbance observer for adding a disturbance compensation torque T, calculated from a torque command T* and an electric motor rotational speed ω, to a torque command basic signal T*, calculated on the basis of a deviation between a speed command ω* and a feedback speed ωby a PI control section, thus outputting the torque command T*; and a phase advance compensation observer for generating, from the torque command basic signal T* and the electric motor rotational speed ω, an output of a nominal plant serving as an element in which no delay occurs, thus outputting the output as the feedback speed ω.