Electricity: motive power systems – Linear-movement motors
Reexamination Certificate
2005-01-07
2008-09-30
Donovan, Lincoln (Department: 2837)
Electricity: motive power systems
Linear-movement motors
C310S010000, C310S012060, C310S015000
Reexamination Certificate
active
07429839
ABSTRACT:
A linear compressor having a reciprocating piston, a linear motor driving the piston, and a motor controller to vary magnitude of a stroke of the piston according to power, including: a near-collision detector detecting whether the piston passes a near-collision position spaced from a top dead center according to a predetermined high power with a predetermined high power distance; and a collision return time calculator calculating a near-collision position return time taking for the piston to return to the near-collision position on a basis of the detection of the near-collision detector according to compression and expansion cycles, and wherein the motor controller decreases a driving force of the linear motor if the near-collision position return time is greater than a predetermined allowance time per power, and increases the driving force of the linear motor if the near-collision position return time is less than the predetermined allowance time per power.
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Brandt Michael
Staas & Halsey , LLP
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