Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1982-02-10
1984-09-11
Smith, Jr., David
Electricity: motive power systems
Induction motor systems
Primary circuit control
318812, H02P 540
Patent
active
044712855
ABSTRACT:
A system for operating an induction motor at variable speeds, which is particularly effective when an induction motor is to rotate at a very low speed of several r.p.m. or less. The system produces polyphase sinusoidal signals of a frequency which corresponds to the difference between a command speed and the actual speed of the induction motor, the number of phases of the sinusoidal signals being equal to the number of phases at which the induction motor operates, a sinusoidal carrier wave having a constant frequency of from 50 to 400 Hz and a constant amplitude, and polyphase induction motor drive signals formed by modulating the carrier wave by the polyphase sinusoidal signals. The induction motor drive signals are amplified up to a prescribed value and then applied to the induction motor to energize the stator for each respective input phase so that the rotor of the induction motor will be caused to rotate at a very low speed.
REFERENCES:
patent: 3346794 (1967-10-01), Stemmler
patent: 3353081 (1967-11-01), Stemmler
patent: 3538420 (1970-11-01), Klein
patent: 3585488 (1971-06-01), Gutt et al.
patent: 3662247 (1972-05-01), Schieman
patent: 3775652 (1973-11-01), Bowler et al.
patent: 3886430 (1975-05-01), Meir
patent: 4028600 (1977-06-01), Blaschke et al.
patent: 4047083 (1977-09-01), Plunkett
patent: 4078192 (1978-03-01), Fultz
patent: 4086623 (1978-04-01), Jensen
patent: 4272715 (1981-06-01), Matsumoto
patent: 4322671 (1982-03-01), Kawada et al.
patent: 4322672 (1982-03-01), Walker
patent: 4356544 (1982-10-01), Ono et al.
Ishida Hiroshi
Kawada Shigeki
Fujitsu Fanuc Limited
Smith Jr. David
LandOfFree
System for variable speed operation of induction motors does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with System for variable speed operation of induction motors, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System for variable speed operation of induction motors will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1197027