Method and apparatus for measuring velocity and position in serv

Details Method and apparatus for measuring velocity and position in serv Method and apparatus for measuring velocity and position in serv

1984-03-05

1987-01-27

Krass, Errol A.

Boots, shoes, and leggings

318603, 324165, 340347P, 340672, G01P 342, G06F 1520

Patent

active

046398848

ABSTRACT:
Method and apparatus for measuring the velocity, whether rotary or reciprocating, of a servo shaft driven by a motor, without employing a tachometer. From the movement of the shaft is produced a pair of signals in quadrature, with transitions expressible in Gray code for one cycle as 00, 01, 11, 10 and then back to 00. Meanwhile, a clock provides a large number of evenly spaced counts per selected quadrature transitions. The number of counts between two selected quadrature transitions is read and the total number of quadrature transitions between the selected transitions is divided by the total number of counts during the same time.

REFERENCES:
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patent: 4520781 (1985-06-01), Nishida
patent: 4580046 (1986-04-01), Sasaki et al.
patent: 4580047 (1986-04-01), Sasaki et al.
"Shaft Position and Direction Encoder": by Bailey et al., IBM Technical Disclosure Bulletin, vol. 14, No. 1, Jun. 1971, pp. 54 and 55.
"Bi-directional Count from Quadrature Signals": by Hancock, Electronic Engineering, May 1978, p. 24.

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