Precision electronic speed controller for an alternating-current
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.
- Inventors:
-
- Albuquerque, NM
- Issue Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- OSTI Identifier:
- 866532
- Patent Number(s):
- 4731572
- Assignee:
- United States of America as represented by Department of Energy (Washington, DC)
- Patent Classifications (CPCs):
-
G - PHYSICS G21 - NUCLEAR PHYSICS G21K - TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR
H - ELECTRICITY H02 - GENERATION H02P - CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS
- DOE Contract Number:
- W-7405-ENG-36
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- precision; electronic; speed; controller; alternating-current; multi-phase; electrical; motor; subject; inertial; load; developed; particularly; suitable; controlling; neutron; chopper; heavy; spinning; rotor; rotated; phase-locked; synchronism; reference; pulse; train; representative; power; supply; signal; meandering; line; frequency; shaft; revolution; sensor; provides; feedback; internal; digital; timing; generator; compared; computing; unit; provide; control; preferred; embodiment; weighted; linear; error; voltage; phase; drift; computed; anew; stator; windings; driven; amplifiers; provided; input; signals; proper; quadrature; relationship; exciter; consisting; controlled; oscillator; binary; counter; pair; readonly; memories; digital-to-analog; converters; speed control; stator windings; feedback signal; phase error; reference pulse; pulse train; stator winding; reference signal; particularly suitable; control signal; input signals; timing signal; preferred embodiment; power supply; input signal; signal generator; voltage controlled; motor control; spinning rotor; voltage control; digital-to-analog converter; generator provides; phase electric; unit consisting; speed controller; analog converter; precision control; electrical motor; controlled oscillator; /318/
Citation Formats
Bolie, Victor W. Precision electronic speed controller for an alternating-current. United States: N. p., 1988.
Web.
Bolie, Victor W. Precision electronic speed controller for an alternating-current. United States.
Bolie, Victor W. Fri .
"Precision electronic speed controller for an alternating-current". United States. https://www.osti.gov/servlets/purl/866532.
@article{osti_866532,
title = {Precision electronic speed controller for an alternating-current},
author = {Bolie, Victor W},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Jan 01 00:00:00 EST 1988},
month = {Fri Jan 01 00:00:00 EST 1988}
}