Precision electronic speed controller for an alternating-current
The patent describes a controller for controlling the speed of a multiphase induction motor so as to maintain the motor in phase with an alternating-current power supply signal that is subject to meandering in frequency about a nominal line frequency. The motor includes power amplifiers having outputs which drive the respective stator windings of the motor, comprising: shaft revolution sensor means operable to provide a feedback pulse train signal having frequency representative of the speed of the motor; phase error signal representative of the phase difference between the alternating-current power supply signal and the feedback pulse train signal; speed error signal generator means for generating a speed error signal that is representative of the different between the speed of the motor and a predetermined desired speed; drift error signal generator means for generating a drift error signal representative of the integral of the phase error signal over time; a summing amplifier for combining the speed phase and drift error signals to produce a single motor control signal.
- Assignee:
- Dept. of Energy, Washington, DC
- Patent Number(s):
- US 4731572
- OSTI ID:
- 5019731
- Country of Publication:
- United States
- Language:
- English
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Precision electronic speed controller for an alternating-current motor
Variable speed controller with improved efficiency of energy transfer for an ac induction motor
Related Subjects
420800* -- Engineering-- Electronic Circuits & Devices-- (-1989)
ALTERNATING CURRENT
AMPLIFIERS
CONTROL SYSTEMS
COUNTING TECHNIQUES
CURRENTS
DIGITAL SYSTEMS
ELECTRIC CURRENTS
ELECTRIC MOTORS
ELECTRONIC CIRCUITS
ELECTRONIC EQUIPMENT
EQUIPMENT
ERRORS
FEEDBACK
FUNCTION GENERATORS
INDUCTION
MOTORS
PULSE CIRCUITS
PULSE GENERATORS
SIGNAL CONDITIONERS
SIGNAL CONDITIONING
VELOCITY
VOLTAGE REGULATORS