Method and apparatus for detecting absolute position

Details Method and apparatus for detecting absolute position Method and apparatus for detecting absolute position

1986-06-03

1988-07-12

Ro, Bentsu

Electricity: motive power systems

Positional servo systems

With particular 'error-detecting' means

318653, 318687, G05G 100

Patent

active

047572442

ABSTRACT:
A rod member provided with magnetic and non-magnetic portion arranged alternatingly is provided and a plurality of detecting heads for detecting magnetic resistance are disposed along the longitudinal direction of the rod member with predetermined distances, respectively. The pitches of the respective pairs of the magnetic and non-magnetic portions are arranged with pitches different with each other by the predetermined distances. Output signals transmitted from the detecting heads in accordance with the relative movement between the rod member and the detecting heads are detected by phase detectors, and on the basis of the detected signals, the predetermined operation is carried out in an operation processing unit thereby to obtain the absolute positional relation between the rod member and the detecting heads in, for example, of a positioning system such as in a die casting machine.

REFERENCES:
patent: 3083324 (1963-03-01), Wolff
patent: 3504246 (1970-03-01), Russell
patent: 3505576 (1970-04-01), Burkhart
patent: 4589038 (1986-05-01), Radtke

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