Drive system in a geodetic measurement instrument

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United States of America Patent

PATENT NO 12018942
APP PUB NO 20210055104A1
SERIAL NO

16998958

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Abstract

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A geodetic surveying instrument to move a measurement light beam into a desired measurement direction in space, comprising at least one movement axis which is motorized, providing a positioning of the measurement direction of the geodetic surveying instrument, and an instrument-encoder at the movement axis configured for deriving the measurement direction as a measurement value of the geodetic surveying instrument. The geodetic surveying instrument comprises a transmission link of the movement axis of the geodetic surveying instrument to a motor axis of a stepper motor, which transmission link is configured with a gear reduction and a slipping clutch arrangement, and wherein the stepper motor comprises a rotational motor-encoder on its motor-axis and is driven by a motor controller that provides a field oriented control of phase currents of the stepper motor, which field orientation is derived based on the rotational motor-encoder.

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Patent Owner(s)

Patent OwnerAddress
LEICA GEOSYSTEMS AGSWISS HARE BORREGO HEERBRUGG BASEL-LANDSCHAFT

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Herbst, Christoph Dornbirn, AT 11 44
Müller, Benjamin St. Gallen, CH 15 37
Schmitt, Thomas Lienhard Dornbirn, AT 1 1
Wachter, Hannes Martin Feldkirch, AT 1 1

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