Multiturn potentiometer

Details Multiturn potentiometer Multiturn potentiometer

1997-09-16

1998-11-17

Gellner, Michael L.

Electrical resistors

Mechanically variable

With switch actuated by resistor actuator

338162, 338173, 338191, H01C 1032

Patent

active

058382224

ABSTRACT:
An improved multiturn potentiometer consists of a rotor assembly including a wiper in electrical contact with an output terminal and an annular resistance strip. The annular resistance strip is electrically connected to a source of potential through one or more potentiometric rotary switches which are activated periodically change the magnitude of potential to the annular resistance strip. Movement of the wiper along the annular resistance strip varies the potential to the output terminal. Activation of the rotary switches is effected by rotation of the rotor assembly and increases or decreases the potential to the annular resistance strip depending on the direction of rotation. Each potentiometric rotary switch is capable of multiple variations of potential so that each revolution of the rotor assembly effects movement of the rotary switch to supply a new potential to the annular resistance strip. As the wiper moves along the annular resistance strip the signal to the output terminal is interpolation of the potential of the annular resistance strip. In one embodiment there are three switches spaced about the annular resistance strip and the annular resistance strip is divided into three segments, each of which are connected to one of the switches. Each switch has seven positions for variation of potential.

REFERENCES:
patent: 1387433 (1921-08-01), Sundhaussen
patent: 2573280 (1951-10-01), Schmidt
patent: 2786122 (1957-03-01), Strain
patent: 4117444 (1978-09-01), Hilreth et al.
patent: 4223294 (1980-09-01), Moffitt et al.
patent: 4682142 (1987-07-01), Lohner et al.
patent: 5075604 (1991-12-01), Crook et al.
patent: 5200747 (1993-04-01), Betz et al.

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