公开(公告)号：US12018942B2

公开(公告)日：2024-06-25

申请号：US16998958

申请日：2020-08-20

Applicant: LEICA GEOSYSTEMS AG

Inventor： Benjamin Müller ,  Thomas Lienhard Schmitt ,  Christoph Herbst ,  Hannes Martin Wachter

IPC: G01C15/00 ,  B25B21/00 ,  B25F5/00 ,  G01C1/02

CPC classification number: G01C15/002 ,  B25B21/00 ,  B25F5/001 ,  G01C1/02

Abstract: 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.