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:
Nov. 18, 1986
Filed:
May. 22, 1985
Shitta Shingu, Tokyo, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A non-linear control type magnetic bearing comprises a pair of electromagnets for magnetically attracting an object so as to permit it to be levitated therebetween, a current supply circuit for alternately supplying an excitation current to the pair of electromagnets, a circuit for generating a pair of current level signals corresponding to the levels of the currents through the respective electromagnets, a velocity sensor for generating a velocity signal corresponding to a velocity with which the object is moved, a difference circuit for generating a difference signal corresponding to a pair of current level signals, a differentiating circuit for differentiating the velocity signal to generate an acceleration signal corresponding to the acceleration rate of the object, an analog operating circuit for generating a position displacement signal corresponding to the position of displacement of the object by substituting a difference signal and acceleration signal into an equation of motion of the object, and a switching discriminator circuit for identifying a positive or a negative sign of a linear equation of the position displacement signal and velocity signal and for supplying to a current supply circuit a switching signal which alternately switches a supply of current to the respective electromagnets.