# US 9,038,484 B2 · Force/moment sensor for measurement of forces and moments

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- Number: US 9,038,484 B2
- Document ID: US9038484B2
- Status: Granted
- Kind: B2
- Application number: 13/416,895
- Filed: 2012-03-09
- Published: 2012-09-20
- Granted: 2015-05-26
- Earliest claimed: 2011-03-15
- Assignees: Deutsches Zentrum für Luft- und Raumfahrt e.V.
- Applicants: Ulrich Seibold
- Inventors: Ulrich Seibold
- Web page: https://patentgrep.com/patent/US9038484B2

## CPC

- G01L 5/1627: of strain gauges (using piezoresistors G01L5/162)
- G01L: MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE (weighing G01G)

## Abstract

A force/moment sensor for measurement of three orthogonal forces and three orthogonal moments, comprises an inner holding element which is surrounded by an outer holding element. The two holding elements are connected to each other by deformation elements. For each deformation element, at least one deformation transducer is provided. The force/moment sensor is preferably monolithic, and the deformation transducers, formed as strain gauges, are preferably arranged in one plane or in two preferably parallel planes.

## Claims

### Claim 1

A force/moment sensor for measurement of three forces and three moments, comprising:
an inner holding element surrounded by an outer holding element,
a plurality of deformation elements connecting the holding elements to each other, wherein the plurality of deformation elements comprises at least six deformation elements, and
a single deformation transducer for each of the at least six deformation elements so that each of the single deformation transducers is connected to a different one of the at least six deformation elements, each of the single deformation transducers being connectible via lines to an evaluation unit,
wherein each of the single deformation transducers is arranged exclusively on a top and/or bottom side of the plurality of deformation elements.

### Claim 2 (depends on 1)

The force/moment sensor according to claim 1, wherein all of the single deformation transducers arranged on the top side are located in a common plane and all of the single deformation transducers arranged on the bottom side are located in a common plane.

### Claim 3 (depends on 1)

The force/moment sensor according to claim 1, wherein the plurality of deformation elements are formed as flexure hinges and/or are connected to the inner or outer holding elements via flexure hinges.

### Claim 4 (depends on 1)

The force/moment sensor according to claim 1, wherein the holding elements have a higher stiffness than the plurality of deformation elements.

### Claim 5 (depends on 1)

The force/moment sensor according to claim 1, wherein the holding elements and the plurality of deformation elements are one-pieced.

### Claim 6 (depends on 1)

The force/moment sensor according to claim 1, wherein the outer holding element and/or the inner holding element are annular.

### Claim 7 (depends on 1)

The force/moment sensor according to claim 1, wherein each of the single deformation transducers comprises a transducer for capturing linear forces and a transducer for capturing shear forces, which are arranged alternately with each other on adjacent deformation elements.

### Claim 8 (depends on 1)

The force/moment sensor according to claim 1, wherein the inner holding element comprises a central opening for passing instruments therethrough.

### Claim 9 (depends on 1)

The force/moment sensor according to claim 1, wherein each of the single deformation transducers is designed as linear and/or shear strain gauge.

### Claim 10 (depends on 1)

The force/moment sensor according to claim 1, wherein each of the single deformation transducers is arranged symmetrically between the inner and/or outer holding elements.

### Claim 11 (depends on 10)

The force/moment sensor according to claim 10, wherein each of the single deformation transducers is arranged symmetrically on a periphery of the inner holding elements.

### Claim 12 (depends on 1)

The force/moment sensor according to claim 1, wherein the plurality of deformation elements are T-shaped in plan view, with two ends thereof being connected to the outer holding element and one end being connected to the inner holding element.

### Claim 13 (depends on 1)

The force/moment sensor according to claim 1, wherein the single deformation transducers are formed as a unit.

### Claim 14 (depends on 13)

The force/moment sensor according to claim 13, wherein the unit is a film-type strain gauge.