Low cost servo operated digital positioning system

Details Low cost servo operated digital positioning system Low cost servo operated digital positioning system

1983-12-20

1985-10-08

Dobeck, B.

Electricity: motive power systems

Positional servo systems

Frequency- or phase-modulated systems

318602, 318640, G05B 101

Patent

active

045462992

ABSTRACT:
A low cost servo operated digital positioning system which utilizes a phase shift control circuit in combination with an encoder and servo circuit for driving a moveable element. The encoder generates a pair of signals A which may be equivalent to a sine signal A and a cosine signal A. The phase shift circuit multiplies signals from the encoder by a sine of a demand signal B and by a cosine of the demand signal B and produces a sine (A+B) signal and a cosine (A+B) signal. These sine and cosine shift signals are introduced into a servo circuit for control of a moveable element. By phase shifting these signals it is possible to substantially increase the overall number of positions to which a moveable member may be moved and thereby substantially increase the overall accuracy of a positioning system.

REFERENCES:
patent: 3875468 (1975-04-01), Yagi et al.
patent: 4215301 (1980-07-01), Mason
patent: 4227133 (1980-10-01), Imamura
patent: 4342077 (1982-07-01), Passey et al.
patent: 4476420 (1984-10-01), Asakawa

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