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:
Jun. 09, 1987
Filed:
May. 05, 1986
Applicant:
Inventor:
Tooru Tanahashi, Inazawa, JP;
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B66B / ;
U.S. Cl.
CPC ...
187119 ; 318798 ;
Abstract
A speed control apparatus for an elevator utilizing variable command values of the primary current of an induction motor for controlling the operation of the motor. When the cage is running at a rated speed, the terminal voltage of the induction motor is detected and supplied to a microcomputer to calculate an exact secondary resistance with respect to the temperature condition of the induction motor so as to determine the aforementioned command value of the primary current that is necessary for high speed precision control.