Title :
A 400-W tri-state switching controller for reciprocating linear motors
Author :
Maresca, Robert L.
Author_Institution :
North American Philips Corp., Briarcliff Manor, NY, USA
fDate :
1/1/1988 12:00:00 AM
Abstract :
A switching controller is described that uses stable limit-cycle theory and phase-locked-loop control for high-power reciprocating linear motor systems. The control system comprises a low-frequency tristate switching circuit, a linear motor, and an axial position sensor along with three distinct feedback loops (peak-amplitude feedback, average-position feedback, and phase feedback). The system was tested on a 400-W reciprocating compressor and achieved efficiencies of greater than 90% with excellent control of the critical operating parameters: speed, stroke, phase, and center position of the linear motor. The system replaces a 70%-efficient high-frequency switching amplifier and classical servo-control system previously used in long-life Stirling-cycle refrigerators for space applications
Keywords :
compressors; controllers; feedback; limit cycles; linear motors; nonlinear control systems; phase-locked loops; refrigerators; switching circuits; 400 W; 90 percent; Stirling-cycle refrigerators; average-position feedback; axial position sensor; centre position control; feedback loops; low-frequency tristate switching circuit; nonlinear control system; peak-amplitude feedback; phase control; phase feedback; phase-locked-loop control; reciprocating compressor; reciprocating linear motors; space applications; speed control; stable limit-cycle theory; stroke control; switching controller; Circuit testing; Control systems; Feedback loop; Limit-cycles; Linear feedback control systems; Phase locked loops; Sensor systems; Servomotors; Switching circuits; System testing;
Journal_Title :
Power Electronics, IEEE Transactions on
