Electricity: motive power systems – Synchronous motor systems – Armature winding circuits
Patent
1982-12-17
1988-03-15
Shoop, Jr., William M.
Electricity: motive power systems
Synchronous motor systems
Armature winding circuits
318314, 318807, H02P 146
Patent
active
047315725
ABSTRACT:
A high precision controller for an alternating-current multi-phase electrical motor that is subject to a large inertial load. The controller was developed for and is particularly suitable for controlling, in a neutron chopper system, a heavy spinning rotor that must be rotated in phase-locked synchronism with a reference pulse train that is representative of an ac power supply signal having a meandering line frequency. The controller includes a shaft revolution sensor which provides a feedback pulse train representative of the actual speed of the motor. An internal digital timing signal generator provides a reference signal which is compared with the feedback signal in a computing unit to provide a motor control signal. In the preferred embodiment, the motor control signal is a weighted linear sum of a speed error voltage, a phase error voltage, and a drift error voltage, each of which is computed anew with each revolution of the motor shaft. The stator windings of the motor are driven by two amplifiers which are provided with input signals having the proper quadrature relationship by an exciter unit consisting of a voltage controlled oscillator, a binary counter, a pair of readonly memories, and a pair of digital-to-analog converters.
REFERENCES:
patent: 3873900 (1975-03-01), Sommer
patent: 3919634 (1975-11-01), Appel
patent: 3946293 (1976-03-01), Feld
patent: 4160939 (1979-07-01), Damouth
patent: 4223261 (1980-09-01), White
patent: 4310787 (1982-01-01), Seeger
patent: 4312031 (1982-01-01), Kudor
Wallace, G. R. and Sims, "A Phase Locked Neutron Chopper Rotor Drive Syst, U.K. Atomic Energy Authority, Harwell, Paper No. AERE-R 9411, Sep. 1980.
"Harwell M. K., VIII Rotor Drive System for Neutron Time-of-Flight Experiments", U.K. Atomic Energy Authority, Harwell, Mar. 1980.
Bolie, V. et al., "A Phased Chopper at WNR", Los Alamos Unclassifed Report No. LA-UR-82-2480.
Eklund William A.
Gaetjens Paul D.
Hightower Judson R.
Keane Patrick C.
Shoop Jr. William M.
LandOfFree
Precision electronic speed controller for an alternating-current does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Precision electronic speed controller for an alternating-current, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Precision electronic speed controller for an alternating-current will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1928133