Detection of the instantaneous position of a linearly...

Details Detection of the instantaneous position of a linearly... Detection of the instantaneous position of a linearly...

2006-09-13

2008-05-13

Aurora, Reena (Department: 2862)

Electricity: measuring and testing

Magnetic

Displacement

C324S234000, C324S236000

Reexamination Certificate

active

07372255

ABSTRACT:
A piston position sensing circuit for sensing the instantaneous position of a piston of a free piston Stirling machine or a compressor mechanically connected to a reciprocating member of a linear electric motor or alternator. A source of a high frequency, alternating, electrical signal applies a high frequency signal to the winding circuit of the linear alternator or motor. A filter circuit is connected to the winding circuit and passes electrical signals at the frequency of the high frequency source and blocks signals at the operating frequency of reciprocation. A peak detector circuit is connected to the filter circuit and detects the peak of the filter circuit output signal to provide an instantaneous peak magnitude that is proportional to the instantaneous piston position.

REFERENCES:
patent: 4577509 (1986-03-01), Moser
patent: 4587850 (1986-05-01), Moser
patent: 4667158 (1987-05-01), Redlich
patent: 5342176 (1994-08-01), Redlich
patent: 5600237 (1997-02-01), Nippert

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