[특허]Method and apparatus for measuring piston position in a free piston compressor

[미국특허] Method and apparatus for measuring piston position in a free piston compressor 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F04B-049/00
출원번호	US-0282631 (1994-07-29)
발명자 / 주소	Redlich Robert W. (Athens OH)
출원인 / 주소	Sunpower, Inc. (Athens OH 02)
인용정보	피인용 횟수 : 45 인용 특허 : 0

초록 ▼

A method of measuring the distance at closest approach between the piston of a free piston compressor and the cylinder head. The method derives measurements of both the alternating and average components of piston position from direct measurements of the voltage and current applied to the linear permanent magnet motor that drives the piston, and thus eliminates any requirement for an additional position sensor located within the compressor.

대표청구항 ▼

An improved gas or vapor compressor including a control apparatus and a free piston linked to a spring and reciprocating in a cylinder in alternating suction and pressure phases, the piston during reciprocation having an alternating component of displacement, a velocity, an acceleration and an end displacement of the piston\s excursion in the cylinder, the piston being driven in reciprocation by an electromagnetic linear motor drivingly linked to the piston, the linear motor including a magnet and a winding having an associated resistance and inductance, the motor having input terminals and a characteristic electro/mechanical transfer constant, the motor being driven by an alternating voltage applied to and a current forced through the input terminals of the motor winding, wherein the improvement is a feedback control apparatus comprising: (a) a voltage detector circuit connected to said winding input terminals for detecting the voltage applied to the winding as a function of time; (b) a current detector circuit connected to said winding for detecting the current through the winding as a function of time; (c) a command signal input for inputting a command signal representing a selected, required end displacement; (d) a computing circuit generating a signal representing a measured value of said end displacement and comparing said measured value signal to said command signal to generate an error signal by: (i) computing the velocity of the reciprocating piston as a function of time from the detected voltage and current in accordance with the equation: v=(1/aV-L(dI/dt)-IR); wherein aXc=xi-xo+(aK)Io-(M/K)Ao; wherein: Xc is said end displacement xi is the alternating displacement when the velocity is zero and is changing from toward said end displacement to away from said end displacement xo is the alternating displacement from step (ii) at a selected time during the suction phase Ao is the acceleration from step (iii) at said selected time Io is the current detected from the current detector at said selected time M is the mass of the reciprocating body K is the spring constant of the spring; (vi) comparing said command signal to the computed end displacement signal Xc to generate an error signal; and (e) a motor voltage control circuit having an input connected to receive said error signal and having an output connected to said motor winding for changing the voltage applied to the motor winding in response to said error signal in a direction minimizing the error signal.

이 특허를 인용한 특허 (45) 인용/피인용 타임라인 분석

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Kusumba, Srujan; Hahn, Gregory William; McIntyre, Michael Lee; Latham, Joseph W., Method for operating a linear compressor.
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van der Walt Nicholas R. ; Unger Reuven Z., Refrigeration circuit having series evaporators and modulatable compressor.
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van der Walt Nicholas R. ; Unger Reuven Z., Refrigeration circuit having series evaporators and modulatable compressor.
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A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
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[미국특허] Method and apparatus for measuring piston position in a free piston compressor 원문보기

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[미국특허] Method and apparatus for measuring piston position in a free piston compressor 원문보기

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