Geometrical instruments – Miscellaneous – Light direction
Patent
1992-08-27
1993-11-23
Cuchlinski, Jr., William A.
Geometrical instruments
Miscellaneous
Light direction
33 1PT, G01D 522, G01B 730
Patent
active
052632580
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a measuring device for determining the angle of rotation. A measuring device for contactless determination of a rotation angle of a shaft is known comprising two bodies which are moved relative to each other and sensor coils whose inductance and alternating current resistance values are varied by changes in the relative positions of regions of electrically conductive and/or ferromagnetic material and the coils due to rotation of the shaft. In a measuring device known from DE-OS 38 24 535.3 a central longitudinal groove is formed in a cylindrical coil body proceeding from one front side. Accordingly two cores are formed which are semicircular in cross section, a coil being wound around each core. A measuring part which provides damping is produced from electrically conducting and/or ferromagnetic material. It surrounds at least part of the axial length of the external coil regions. Alternating current flows through the coils. As a result of the relative rotation of the measuring part, the degree to which the measuring part and the coils overlap changes in the opposite direction so that the alternating current resistance of the coils is varied in a corresponding manner. The coils must be positioned exactly relative to the measuring sleeve when assembling the sensor, which is relatively costly.
Further, a measuring device for contactless measurement of a change in path and/or angle is known from the subsequently published DE-OS 40 01 544.0 in which the coil bodies are offset in the axial direction of the measuring device and arranged so as to be offset at an angle relative to one another in the radial direction corresponding to the quantity of coil bodies. The coils are wire-wound coils and alternating current likewise flows through them.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an improved measuring device for contactless determination of a rotation angle of a shaft relative to a stationary body.
According to the present invention, the measuring device for contactless determination of a rotation angle of a shaft comprises a coil body having an axial direction and a plurality of cores offset from each other in the axial direction, a shaft rotatably supported in the coil body, the coil body providing bearing means for the shaft, and having a rotation angle relative to the coil body; at least one electrically conducting coil arranged on each of the cores; and a measuring part at least partially surrounding, spaced from and adjacent to an outer surface of the coil body so as to extend circumferentially at least half way around the coil body. The measuring part is connected nonrotatably with the shaft so that the measuring part rotates relative to the coil body when the shaft rotates. The measuring part is at least partially made from an electrically conductive and/or ferromagnetic material so that the measuring part induces variations in the inductance and the alternating current resistance of the coils when the measuring part moves relative to the coil body, the variations being useful for determining a rotation angle change.
Alternatively, the measuring device comprises a coil body having an axial direction, a shaft rotatably supported in the coil body, the coil body providing bearing means for the shaft, and having a rotation angle relative to the shaft; a plurality of electrically conducting coils on the coil body spaced from each other in the axial direction; a damping body mounted nonrotatably on the shaft and having a plurality of cores offset from each other in the axial direction, each of the cores being positioned adjacent and spaced from at least one of the coils on the coil body; and a shielding plate located to partially shield the cores from the coils. The damping body is connected nonrotatably with the shaft so that the damping body moves relative to the coil body when the shaft rotates and the damping body is at least partially made from an electrically conductive and/or ferromagnetic material so
Dobler Klaus
Hachtel Hansjorg
Cuchlinski Jr. William A.
Fulton C. W.
Robert & Bosch GmbH
Striker Michael J.
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