Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1995-10-24
1997-11-18
Wysocki, Jonathan
Electricity: motive power systems
Induction motor systems
Primary circuit control
318811, H02P 700
Patent
active
056891679
ABSTRACT:
A circuit for powering a three-phase AC induction motor. The circuit generates a first signal of the form Vdc+A sin (2.pi.ft-0.degree.) and a second signal of the form Vdc+A sin (2.pi.ft-90.degree.) as is done in conventional circuits for powering two-phase AC induction motors. A vector summation circuit is used to create a third signal from the first two signals. The third signal is of the form Vdc+A sin (2.pi.ft+60.degree.). The first signal is input to a first error amplifier along with a first sampled difference signal from the motor. The third signal is input to a second error amplifier along with a second sampled difference signal from the motor. The outputs from each of the first and second amplifiers is input into a first comparator and a second comparator along with a sawtooth waveform to create a first sinusoidally modulated square wave signal and a second sinusoidally modulated square wave signal. The first and second sinusoidally modulated square wave signals are fed to driver circuits which in turn control an H-bridge circuit for powering the motor from a DC bus. Therefore, the invention achieves two-phase control of a three-phase AC induction motor.
REFERENCES:
patent: 4008421 (1977-02-01), Bird
patent: 4101821 (1978-07-01), Kirby
patent: 4482961 (1984-11-01), Kilner et al.
patent: 4680526 (1987-07-01), Okuyama et al.
patent: 4825132 (1989-04-01), Gritter
patent: 4928043 (1990-05-01), Plunkett
patent: 4962339 (1990-10-01), Schauder
patent: 5009186 (1991-04-01), Rippel et al.
patent: 5032771 (1991-07-01), Kerkman et al.
patent: 5066899 (1991-11-01), Nashiki
patent: 5206543 (1993-04-01), Takita et al.
patent: 5218283 (1993-06-01), Wills et al.
patent: 5231339 (1993-07-01), Kishimoto et al.
patent: 5247237 (1993-09-01), Koyama et al.
patent: 5252905 (1993-10-01), Wills et al.
patent: 5278486 (1994-01-01), Kim
patent: 5304911 (1994-04-01), Anderson
patent: 5334923 (1994-08-01), Lorenz et al.
patent: 5345160 (1994-09-01), Corniere
Gottlieb, I. M., Electric Motors & Control Techniques, 2nd Ed., pp. 147-149, 235-247, TAB Books, 1994.
Micro Linear Corporation
Wysocki Jonathan
LandOfFree
Two-phase electronic control of a three-phase induction motor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Two-phase electronic control of a three-phase induction motor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Two-phase electronic control of a three-phase induction motor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1568390