Variable speed drive system

Electricity: motive power systems – Induction motor systems – Primary circuit control

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

318732, 318778, 318818, H02P 762

Patent

active

049565966

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.

REFERENCES:
patent: 3978381 (1976-08-01), Yamamoto et al.
patent: 4652807 (1987-03-01), Nagura
patent: 4748394 (1988-05-01), Watanabe
patent: 4812730 (1989-03-01), Nakagawa et al.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Variable speed drive system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Variable speed drive system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Variable speed drive system will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1186731

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.