High resolution one and two dimensional position indicating appa

Details High resolution one and two dimensional position indicating appa High resolution one and two dimensional position indicating appa

1990-06-12

1991-12-10

Strecker, Gerald R.

Electricity: measuring and testing

Magnetic

Displacement

32420723, 318661, 34087031, 341112, G01B 730, G01B 714, G08C 1906

Patent

active

050721798

ABSTRACT:
Position indicating apparatus that allows position detection with windings provided on only one of two members and an output signal in which the position of one of the members relative to the other member is directly encoded in the phase of the output signal. A first member has a plurality of spaced ferromagnetic protuberances. A second member, movable with respect to the first member, contains at least first, second and third poles located in proximity to the protuberances and spans 360 spatial degrees. Each pole contains a winding with one terminal of each winding connected to a common point. The windings are driven at a fundamental carrier frequency with individual signals of equal amplitude but different temporal phases that span 360 temporal degrees. Circuit means detect the phase of the resulting carrier signal at the common point, which phase is linearly representative of position. Embodiments are disclosed for dimensional linear, one dimensional rotary, two dimensional planar and two dimensional cylindrical motion.

REFERENCES:
patent: 2875524 (1959-03-01), Bower et al.
patent: 2905874 (1959-09-01), Kelling
patent: 3956618 (1976-05-01), Gotz
patent: 4700189 (1987-10-01), Welburn
patent: 4717874 (1988-01-01), Ichikawa et al.
patent: 4754220 (1988-06-01), Shimizu et al.
patent: 4794511 (1988-12-01), Lundin

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