Drive system in a geodetic measurement instrument
US12018942B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 20, 2020 |
| Grant date | Jun 25, 2024 |
| Priority date | — |
| Expiry date | Apr 27, 2043 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C1/02
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.