High resolution and wide range shaft position transducer systems
AssigneeOtis Elevator Company
InventorsMarvin Masel, Ralph J. Meehan, Joris Schroeder
Life of this patent
Estimating the term…
Abstract
Apparatus for producing digital signals signifying the angular position in each revolution and the number of revolutions of a shaft which rotates a plurality of times. The apparatus includes two rotary position transducers which are coupled to each other and to the shaft. Both of these transducers rotate a plurality of times in response to the rotations of the shaft, one of the transducers rotating at a different speed than the other. Each transducer produces signals which are individual to the respective transducer and are the same for each rotation of the respective transducer.
Claims5
A rotary shaft position transducer for providing a binary representation of the number of revolutions made by a rotatable shaft to which the transducer is connected, comprising:
- first and second coded disks having sensible indicia thereon and arranged for mutually related rotation by said shaft so that a first one of said coded disks is rotated an integral number of revolutions for each revolution of said shaft and the second one of said coded disks is rotated an even binary number of, or 2.sup.n, revolutions as said first coded disk is rotated one more than said binary number, or 2.sup.n +1 revolutions, where n is an integer greater than zero;
- sensing means related to each disk for sensing the incidia thereon to provide signals indicative of rotation of each disk from a rotational reference position;
- and
- signal processing means interconnected with said sensing means and responsive to the signals corresponding to said first coded disk for providing a binary signal representation of the angular position of said first coded disk, and responsive to the signals corresponding to both of said coded disks to provide, as a function of the difference in the angular positions of said disks indicated thereby, a binary signal representation of the number of revolutions that said first coded disk is rotated from said rotational reference position.
Dependencies are inferred from the claim text.