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:
Jul. 15, 1986
Filed:
Oct. 09, 1984
Masashi Yonemoto, Nagoya, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
An apparatus for controlling an elevator having an induction motor for lifting the cage, a speed instruction device which produces a running speed instruction signal for the cage, a speed controller which generates a torque instruction for the induction motor, a current controller which produces a primary current for the induction motor to control it, a first speed detector which is coupled to the induction motor via a mechanism that increases the input speed to the detector and which feeds speed detection signals back to the speed controller, and a second speed detector which is directly coupled to the rotary shaft of the induction motor and which supplies speed detection signals to the current controller.