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:
Feb. 03, 1987
Filed:
Dec. 21, 1984
Applicant:
Inventor:
Hiroshi Kamaike, Inazawa, JP;
Assignee:
Mitsubishi Denki Kabushiki Kaisha, JPX, US;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B66B / ;
U.S. Cl.
CPC ...
187119 ; 318807 ;
Abstract
An alternating current having a variable voltage and frequency which is converted by an inverter is supplied to an induction motor for driving an elevator so that a speed command value is decreased and the output frequency of the inverter is decreased at the energy saved operation. Thus, energy saved operation may be accomplished without adversing the efficiency even if the speed of the cage is decreased. Since the output voltage of the convertor is increased simultaneously with this, the power factor is improved so that saving in energy is furthermore enhanced.