Capacitive rotary position encoder and capacitive rotary position detection method

A technology of rotating position and encoder, which is applied in the direction of using electric device, converting sensor output, and using electric/magnetic device to transmit sensing member, etc., to achieve the effect of determining the rotating position

Active Publication Date: 2015-01-14
LEICA GEOSYSTEMS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Components for evaluating larger numbers of channels (e.g., 50 or more channels) are not used as standard, or require additional hardware expense due to multiplexer circuits, etc.

Method used

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  • Capacitive rotary position encoder and capacitive rotary position detection method
  • Capacitive rotary position encoder and capacitive rotary position detection method
  • Capacitive rotary position encoder and capacitive rotary position detection method

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Embodiment Construction

[0061] figure 1 One embodiment of a capacitive rotary position encoder according to the invention for the absolute determination of the rotational position about a rotational axis is shown. This rotary position encoder has a transceiver unit 9 comprising a first arrangement of N conductive capacitive sensitive areas 5, which are implemented as angular nodes with a predetermined angular range and are uniformly distributed over the periphery part. In this case, the predetermined angular range is in particular approximately 360° / N, so that it can be deduced that the spacing between the sensitive areas 5 is substantially negligibly small, in particular smaller than said angular range several orders of magnitude.

[0062] Furthermore, the transceiver unit 9 has an electrically conductive reference area 4 and an evaluation circuit by means of which the capacitance value between the reference area 4 and one of the sensitive areas 5 can be determined.

[0063] In this case, the sen...

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Abstract

Some embodiments may include a capacitive rotary position encoder for the absolute determination of a rotary position about a rotary spindle. The rotary position encoder may include a transceiver unit, comprising a first arrangement of N electrically conductive, capacitive sensitivity areas which are embodied as angle segments over a defined angle range, which are distributed uniformly over the circumference, an electrically conductive reference area and an evaluation circuit, by means of which an electrical capacitance value between the reference area and one of the sensitivity areas is determinable. In some embodiments the sensitivity areas and the reference area are embodied as conductor track structures on a first electronics printed circuit board. A counterpart may be situated opposite the transceiver unit and rotatable relative thereto about the rotary spindle and may include a reference coupling area arranged opposite the reference area, and an arrangement of electrically conductive code areas connected thereto.

Description

technical field [0001] The invention relates to a capacitive rotary position encoder and a method for capacitive rotary position determination. Background technique [0002] The invention relates in particular to the technical field of capacitive rotary position encoders, in which the overlapping of conductive areas separated with respect to one another by a dielectric and in this case varying said conductive areas varies with rotational position Rotational position is determined with the aid of capacitance values ​​between. According to a simplified theoretical model, in this case the resulting capacitance value is proportional to the area overlap ratio. [0003] In this case, in a rotary encoder, the conductive areas can be rotated contactlessly one above the other using an air gap as a dielectric, with the result that no mechanical wear of the sensor system occurs. In addition to gases such as air, rotary encoders of this type can also be operated with liquids as dielec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/24G01D5/241G01B7/30
CPCG01D5/2415
Inventor 彼得·弗勒S·维尔特切
Owner LEICA GEOSYSTEMS AG
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