Sensor-less control method for linear compressors

Details Sensor-less control method for linear compressors Sensor-less control method for linear compressors

2007-02-20

2011-12-20

Chaki, Kakali (Department: 2122)

Pumps

Condition responsive control of pump drive motor

By control of electric or magnetic drive motor

C700S282000, C062S006000, C318S132000, C318S135000, C310S012040

Reexamination Certificate

active

08079825

ABSTRACT:
A method of protecting a cylinder of a compressor comprising a piston, a linear permanent magnet (PM) having a coil and a magnet, and a sensor-less control of the PM for moving the piston in and out of the cylinder. The method including the steps of receiving a reference position of the piston from a temperature control loop; deriving a compensation voltage and a load spring effect information from a current through the coil; providing a model input voltage to a model of a mechanical structure of the compressor for predicting position of the piston, the model input voltage comprising a first voltage derived from the reference position; a compressor input voltage comprising the first voltage and the compensation voltage; and using a position control loop to recognize when the maximum compression ratio is desired and controlling the piston to achieve maximum compression ratio without causing damage to the discharge valve.

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