Device and method for controlling piston position in linear...

Details Device and method for controlling piston position in linear... Device and method for controlling piston position in linear...

2005-02-22

2005-02-22

Freay, Charles G. (Department: 3746)

Pumps

Condition responsive control of pump drive motor

By control of electric or magnetic drive motor

C417S044110, C417S053000, C417S417000

Reexamination Certificate

active

06857858

ABSTRACT:
Device and method for controlling a piston position in a linear compressor, having a power source, a triac, and a motor, the device including a current phase detecting part for detecting a current switched at the triac, integrating the current, and generating a first square wave corresponding to the integrated current, a stroke phase detecting part for generating an AC voltage waveform having a fixed frequency and varied amplitude according to a piston reciprocation position following motor operation, and generating a second square wave corresponding to the AC voltage waveform, a zero cross detecting part for detecting a zero crossing of the voltage supplied from the power source, and a controlling part for generating a signal for controlling a piston position according to a phase difference of the first square wave detected at the current phase detecting part and the second square wave detected at the stroke phase detecting part, thereby making an efficiency and a reliability the best by controlling a piston position in a cylinder such that a top clearance becomes a minimum according to a phase difference of a current square wave and stroke square wave.

REFERENCES:
patent: 4345442 (1982-08-01), Dorman
patent: 5032772 (1991-07-01), Gully et al.
patent: 5496153 (1996-03-01), Redlich
patent: 5947693 (1999-09-01), Yang
patent: 6199381 (2001-03-01), Unger et al.
patent: 6231310 (2001-05-01), Tojo et al.

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