Refrigeration – Automatic control – Selective heating or cooling
Patent
1980-06-17
1982-08-24
Wayner, William E.
Refrigeration
Automatic control
Selective heating or cooling
62228, 417 44, 417418, F25B 1300, F04B 4906
Patent
active
043454429
ABSTRACT:
A control system for controlling the operation of a reciprocating resonant free-piston variable stroke compressor of the type driven by electrodynamic linear motors wherein the spring-mass system of the compressor which is forced into vibration by the linear motor, is arranged to have a selectively variable mechanical resonant frequency generally centered on the power line frequency of the alternating current power source used to drive the linear motor. The control system provided by this invention variably controls the opening and closing of a gas spring control valve that in turn regulates the pressure of gas filled volumes selectively connected to a manifold vented by the valve. The volumes comprise the resilient gas springs for the resonant piston compressor. For this purpose, the control system comprises an alternating current sensor for deriving a sensed output signal representative of the magnitude and phase of the alternating current supplied to the linear reciprocating motor, a reciprocating piston displacement/velocity sensor for deriving a signal representative of the reciprocating free piston velocity, and an .alpha. angle detector responsive to the signal from the alternating current sensor and the piston velocity signal from the piston displacement/velocity sensor for comparing the phase of the alternating current supplied to the linear reciprocating motor to the reciprocating free resonant piston displacement/velocity and deriving an output .alpha. angle control signal that then is supplied to an RPC control logic circuit for the RCP heat pump. The RPC control logic circuit derives motor voltage control relays for controlling the supply voltage valve to the A-C coils of the linear motor.
REFERENCES:
patent: 3303990 (1967-02-01), Curwen
patent: 3781140 (1973-12-01), Gladden
patent: 3937600 (1976-02-01), White
Claeys Joseph V.
Mechanical Technology Incorporated
Wayner William E.
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