Linear compressor control circuit to control frequency based on

Pumps – Condition responsive control of pump drive motor – By control of electric or magnetic drive motor

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417 4411, F04B 4900

Patent

active

059476931

ABSTRACT:
A linear compressor operating apparatus includes a rectifying and filtering unit for converting an alternating current into a direct current, an inverter for inverting the direct current outputted from the rectifying and filtering unit into a desired frequency alternating current for operating a linear compressor in accordance with the alternating current outputted from the inverter, a position sensor for detecting a position of a piston of the linear compressor and outputting a position signal in accordance with said detection, a current detector for detecting the current running through the linear compressor, and a controller for receiving a current signal outputted from the current detector and a position signal outputted from the position sensor and outputting a pulse width modulating signal to control the inverter. The apparatus obtains a constant value of an interval which determines the efficiency of the linear compressor, regardless of a load thereof and optimizes a phase angle between the driving current and the compressor piston.

REFERENCES:
patent: 4492526 (1985-01-01), Hartwig et al.
patent: 5481166 (1996-01-01), Moreira
patent: 5568023 (1996-10-01), Grayer et al.
patent: 5739650 (1998-04-01), Kimura et al.

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