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:
Dec. 16, 1986
Filed:
Apr. 24, 1985
Applicant:
Inventors:
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B66B / ;
U.S. Cl.
CPC ...
187 / ; 318798 ;
Abstract
A speed control apparatus for an elevator in which a temperature detector for detecting the ambient temperature of an induction motor is disposed, and an arithmetic unit employing a microcomputer is additionally furnished with the function of evaluating the component of temperature rise of a rotor and obtaining the resistance value of the rotor by the use of this component of temperature rise and the temperature detection signal of the temperature detector, to evaluate the optimum instantaneous current command by the use of the temperature-compensated resistance value, whereby the overvoltage and the insufficient torque of the induction motor can be obviated.