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:
Sep. 11, 1990
Filed:
Oct. 17, 1989
Yoshihiro Ogashi, Funabashi, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
An a.c. variable speed drive system which can switch between a driving operation and regenerative operation of an inverter in accordance with the operation speed. This system includes a forced commutation type inverter for controlling a wound-rotor type induction motor at variable speed; an operation mode selection circuit for selectively outputting either a driving operation signal or a regenerative operation signal for the forced commutation type inverter by comparing an operation speed feedback signal from the would-rotor type induction motor with a predetermined judgement value; a forced commutation type inverter control circuit for causing the forced commutation type inverter to operate in a driving operation mode or a regenerative operation mode, in accordance with an output from the operation mode selection circuit; a connection circuit for supplying an output from a converter of the forced commutation type inverter to the wound-rotor type induction motor via a path suitable for the driving operation mode or the regenerative operation mode; and a switch circuit for switching a path of the connection circuit in accordance with an output of the operation mode selection circuit. The connection circuits include several switches.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile