Vibration control of free piston machines through frequency adjustment

a free piston machine and frequency adjustment technology, applied in the direction of piston pumps, pump parameters, domestic cooling apparatus, etc., can solve the problems of unconfined by conventional crankshafts and connecting rods, reciprocating machines cause substantial vibration, and vibration is ordinarily undesirable, so as to reduce or minimize the amplitude of mechanical vibration of mechanical apparatus
US20070256428A1Inactive Publication Date: 2007-11-08SUNPOWER
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
SUNPOWER
Publication Date
2007-11-08
Estimated Expiration
Not applicable · inactive patent

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Abstract

A method and apparatus for minimizing the amplitude of mechanical vibrations of a mechanical apparatus including a linear, freely reciprocating, prime mover coupled to and driving a reciprocating mass of a driven machine in reciprocation at a driving frequency. The coupled prime mover and driven machine have a spring applying a force upon the reciprocating mass to form a resonant main system having a main system resonant frequency of reciprocation. A driving frequency range over which the driven machine operates at an acceptable efficiency of operation is determined and stored. A parameter of the operation of the mechanical apparatus, such as the amplitude of vibrations or an operating temperature, is sensed and the prime mover is driven in response to the sensed parameter at a driving frequency that is offset from the main system resonant frequency of reciprocation, is within the driving frequency range of acceptable efficiency of operation and reduces or minimizes the amplitude of mechanical vibration of the mechanical apparatus under existing operating conditions.
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Description

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] This invention relates generally to minimizing mechanical vibrations of a mechanical apparatus that includes one or more masses driven in reciprocation by a linear, freely reciprocating, prime mover and using the electronic controller that controls that prime mover.

[0003] 2. Description of The Related Art

[0004] Linear, freely reciprocating machines are often used because they provide improved durability, reduced wear, controllability and efficiency. Freely reciprocating machines include linear compressors, free piston Stirling engines, Stirling cooler, cryocoolers and heat pumps, linear motors and linear alternators. Linear, freely reciprocating machines reciprocate with a controllable stroke and are unconfined by conventional crankshafts and connecting rods. However, linear, freely reciprocating machines cause substantial vibration because they have one or more masses that are linearly reciprocating within a comm...

Claims

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