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:
Feb. 26, 1985
Hiroshi Kamaike, Inazawa, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
An elevator control apparatus wherein a primary current of an induction motor is controlled separately for a component parallel to a secondary interlinking magnetic flux and a component orthogonal thereto, comprising means to generate a correction signal having a predetermined frequency, phase and magnitude which cancel a magnetic flux ripple of the induction motor attributed to a shaft deflection of a hoisting machine caused by action of an elevator load, the correction signal from the means being superposed on either of the components parallel and orthogonal to the secondary interlinking magnetic flux so as to control the primary current. Thus, even when the shaft deflection is involved, a control free from any torque ripple is permitted, and an elevator of comfortable ride can be realized.