Device for measuring the torque, the direction of rotation and the speed of rotation of a shaft of a transmission, in particular an output shaft of an azimuth transmission of a wind power plant

Patent metadata

Field	Value
Publication number	US-8955394-B2
Application number	US-201213722198-A
Country	US
Kind code	B2
Filing date	Dec 20, 2012
Priority date	Dec 21, 2011
Publication date	Feb 17, 2015
Grant date	Feb 17, 2015

Abstract

A device for measuring the torque, the direction of rotation, and the speed of rotation of a shaft of a transmission, in particular an output shaft of an azimuth transmission, includes bands configured to be mounted in a fixed position on an outer circumference of the shaft. The bands are configured to be detected by measuring sensors and allow torsion of the shaft to be measured. Each of the measuring sensors has a Hall effect sensor, and the bands are respectively arranged at two different positions on the outer circumference of the shaft. Each of the bands includes polygonal apertures and/or depressions having webs located between the apertures and/or depressions. The webs are configured to be detected by the measuring sensors. A method includes operating the device to measure the torque, the direction of rotation, and the speed of rotation of the shaft.

First claim

What is claimed is:

1. A device for measuring torque, direction of rotation, and speed of rotation of a shaft of a transmission, comprising:
measuring sensors each having a respective Hall effect sensor; and
circumferential bands configured to be circumferentially mounted in a fixed position on an outer circumference of the shaft, the circumferential bands being configured to be detected by the measuring sensors and allowing torsion of the shaft to be measured,
wherein at least one circumferential band is arranged at a first position on the outer circumference and at least one further circumferential band is arranged at a second position on the outer circumference that is different than the first position, each circumferential band defining one or more of polygonal apertures and depressions, and
wherein webs are located between the apertures and/or the depressions and the webs on each circumferential band are configured to be detected by the measuring sensors.

2. The device according to claim 1 , wherein the circumferential bands define at least one aperture and/or at least one depression having a dimension measured over the circumference of the circumferential band that is larger than the dimensions of the other apertures and/or depressions.

3. The device according to claim 1 , wherein the circumferential bands have a maximum spacing with respect to one another, and wherein each measuring sensor comprises at least two Hall effect sensors to allow precise measurement of the torque.

4. The device according to claim 1 , wherein the shaft has shaft components on which the circumferential bands are configured to be circumferentially mounted.

5. The device according to claim 1 , wherein the measuring sensors are arranged perpendicular to the circumferential bands and have a spacing of less than 5 mm with respect to the circumferential bands.

6. A method for operating a device for measuring torque, direction of rotation, and speed of rotation of a shaft of a transmission, the device including measuring sensors each having a respective Hall effect sensor and circumferential bands configured to be circumferentially mounted in a fixed position on an outer circumference of the shaft, the circumferential bands being configured to be detected by the measuring sensors and allowing torsion of the shaft to be measured, wherein at least one circumferential band is arranged at a first position on the outer circumference and at least one further circumferential band is arranged at a second position on the outer circumference, the first and second positions being different from each other, wherein each circumferential band defines one or more of polygonal apertures and depressions, and wherein webs are located between the apertures and/or the depressions and the webs on each circumferential band are configured to be detected by the measuring sensors, the method comprising:
circumferentially mounting the circumferential bands on the shaft or on shaft components;
operating the transmission at a constant rotational speed under no load to calibrate the measurement signal; and
defining a reference web sequence resulting from the movement of the shaft.

7. The method according to claim 6 , further comprising permanently storing the reference web sequence as a calibration value in an electronic evaluation unit.

8. The method according to claim 6 , further comprising comparing the reference web sequence with the web sequence generated during operation of the transmission to determine the direction of rotation of the shaft.

9. The method according to claim 6 , further comprising measuring a time shift in the web sequence of the two circumferential bands relative to one another with torsional loading of the shaft during the operation of the transmission.

10. The method according to claim 9 , further comprising:
converting the time shift in the web sequence into a local shift in the web sequence by the speed of rotation of the shaft; and
calculating the transmitted torque of the shaft therefrom.

11. The device according to claim 1 , wherein the shaft is an output shaft of an azimuth transmission of a wind power plant.

12. The device according to claim 4 , wherein the shaft components include a planet carrier and an input pinion.

Assignees

• Bosch Gmbh Robert

Inventors

• Voss Martin
• Hess Felix
• Schmidt Ralf
• Fehse Jochen
• Vieth Ulrich

Classifications

• G01D5/147 Primary

  influenced by the movement of a third element, the position of Hall device and the source of magnetic field being fixed in respect to each other · CPC title

• G01L3/02

  Rotary-transmission dynamometers · CPC title

• G01P3/44

  for measuring angular speed (G01P3/56 takes precedence) · CPC title

• Y02E10/72

  Wind turbines with rotation axis in wind direction · CPC title

• G01D21/02 Primary

  Measuring two or more variables by means not covered by a single other subclass · CPC title