System and method for resolving information about a rotor comprising a measuring device for measuring and recording in a fixed rotor state without vibration due to rotation

Patent metadata

Field	Value
Publication number	US-9841278-B2
Application number	US-201514870138-A
Country	US
Kind code	B2
Filing date	Sep 30, 2015
Priority date	Sep 30, 2015
Publication date	Dec 12, 2017
Grant date	Dec 12, 2017

Abstract

A system and method for resolving the angular position of a rotor evaluates the real size of the stripes or gears on the rotor by an auxiliary device, such as a sensor shift device in a first embodiment or a camera in a second embodiment, at a fixed rotor, thus eliminating systematic errors and influence of rotor vibration during this calibration. By knowing the actual size or angular increment or produced sensor signal of each repeating element, a compensation of the error can be made and accuracy can be dramatically increased.

First claim

We claim:

1. A system for resolving information about a rotor, the system comprising:
a circumference of the rotor, the circumference having a repeating pattern thereon, wherein the repeating pattern has multiple repeating segments;
a contactless sensor directed to the pattern during rotation of the rotor;
a measuring device configured for measuring and recording, in a fixed rotor state without vibration due to rotation, one or more of:
an angular period of every segment of the repeating pattern;
a width of every segment of the repeating pattern; and
an output signal of the contactless sensor signal by moving the sensor along every segment of the repeating pattern.

2. The system of claim 1 , wherein a detection spot of the contactless sensor has a comparable size or diameter to the width of a single element of the repeating pattern.

3. The system of claim 1 , wherein:
the contactless sensor is the same as the measuring device;
the contactless sensor is mounted to a shifting device, the shifting device being arranged for shifting the contactless sensor tangential or concentric to the rotor; and
the shifting device has a shifting distance or shifting angle covering at least one segment of the repeating pattern.

4. The system of claim 3 , wherein;
the repeating pattern is formed by a gear rim; and
the contactless sensor is an electromagnetic sensor.

5. The system of claim 1 , wherein:
the repeating pattern is formed by an optical pattern, and
the contactless sensor is an optical sensor.

6. The system of claim 5 , wherein the system further comprises an ambient light probe, a signal of the ambient light probe for correction of a signal of the optical sensor.

7. The system of claim 1 , wherein the measuring device comprises a camera device for recording photographic pictures of the segments.

8. The system of claim 6 , wherein the system further comprises a ruler within the viewing area of the camera device.

9. The system of claim 1 , wherein the repeating pattern is formed by a stripe-printed tape applied to the rotor.

10. The system of claim 1 , wherein the repeating pattern is formed by a laser engraved pattern on the surface of the rotor.

11. The system of claim 1 , wherein the repeating pattern is formed by blades of a turbine rotor.

12. The system of claim 1 , wherein the rotor is marked with an additional sensor-readable index marking.

13. The system of claim 1 , wherein the repeating pattern repeats around the entire circumference without a gap.

14. The system of claim 1 , wherein a correction for a signal from the contactless sensor during rotation of the rotor is a function of a signal from the measuring device.

Assignees

• Britte Laurent
• Janssens Karl
• Palermo Antonio
• Siemens Ind Software Nv

Inventors

• Britte Laurent
• Janssens Karl
• Palermo Antonio

Classifications

• G01B7/30

  for measuring angles or tapers; for testing the alignment of axes · CPC title

• G01B11/26 Primary

  for measuring angles or tapers; for testing the alignment of axes · CPC title

• G01D5/145 Primary

  influenced by the relative movement between the Hall device and magnetic fields (see G01R33/06) · CPC title

• G01D5/2449

  using hard-stored calibration data · CPC title

• G01D5/24485

  using other sensors · CPC title