Electricity: motive power systems – With signals – meters – recorders or testing devices
Patent
1991-06-10
1992-10-06
Smith, Jr., David
Electricity: motive power systems
With signals, meters, recorders or testing devices
318729, 318798, H02P 540
Patent
active
051534894
ABSTRACT:
An electric induction motor is coupled to a source of alternating current by a thyristor switch. A control circuit triggers the thyristor switch to create conductive and non-conductive states during each cycle of the alternating current. A circuit senses the voltage across the thyristor switch during a non-conductive state. From that sensed voltage and known characteristics of the motor being controlled, the control circuit derives a measurement of the current flowing through the motor in the conductive state of the thyristor switch. One of two different derivation techniques is used depending upon the length of the non-conductive state. The control circuit includes a means for calibrating the derivation of the current measurement for a specific motor.
REFERENCES:
patent: 3652924 (1972-03-01), Dieterich et al.
patent: 3693069 (1972-09-01), Kelley, Jr. et al.
patent: 4482852 (1984-11-01), Muskovac
patent: 4870340 (1989-09-01), Kral
"A Comparative Study of Symmetrical Three-Phase Circuits for Phase-Controlled AC Motor Drives", William McMurray, IEEE Transactions on Industry Applications, vol. IA-10, pp. 403-411, May/Jun. 1974.
"Stability Analysis of Induction Motors With SCR Voltage Control", J. A. Melkebeek, Conference Proceedings of the 18th UPEC in Guildford, England, 1983.
"An Equivalent-Circuit Model for Phase-Back Voltage Control of AC Machines", F. M. H. Khater et al., IEEE Transactions on Industry Applications, vol. IA-22, No. 5, Sep./Oct. 1986.
Chen Li
Unsworth Peter J.
LandOfFree
Electric current measurement apparatus for a solid state motor c does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Electric current measurement apparatus for a solid state motor c, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electric current measurement apparatus for a solid state motor c will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1191732