Compact, long-range absolute position transducer with an extensi

Details Compact, long-range absolute position transducer with an extensi Compact, long-range absolute position transducer with an extensi

1998-08-31

2000-12-05

Patidar, Jay

Electricity: measuring and testing

Magnetic

Displacement

32420724, 34087032, 336 45, 336131, 341 15, G01B 702, G01B 714, G01D 520, H03M 122

Patent

active

061571881

ABSTRACT:
A compact, long-range inductive absolute position transducer system has two members movable relative to each other and includes a code track transducer and at least one fine wavelength transducer. The two members include a read head member and a scale member. The phase difference between the phase angles of two fine wavelength transducers may be used to generate an intermediate wavelength. Alternatively, the phase difference between the phase angles of one fine wavelength transducer and the code track transducer may be used to generate an intermediate wavelength. The code track includes sequential n-bit code words. Each sequential code word identifies an absolute position of one member with respect to the other with a first resolution. Each intermediate wavelength includes an integer number of code words greater than or equal to one. Using this relationship, the intermediate wavelength is used to identify the start position (start bit) of the appropriate code word. A fine track transducer is then used to define an absolute position of the read head member relative to the scale member to a second, finer resolution.

REFERENCES:
patent: 4697144 (1987-09-01), Howbrook
patent: 4879508 (1989-11-01), Andermo
patent: 4893077 (1990-01-01), Auchterlonie
patent: 5023599 (1991-06-01), Mitchell et al.
patent: 5027526 (1991-07-01), Crane
patent: 5841274 (1998-11-01), Masreliez et al.
patent: 5886519 (1999-03-01), Masreliez et al.

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