System and method for monitoring machine condition and force measurement in a stator of an electrical machine

Patent metadata

Field	Value
Publication number	US-10072992-B2
Application number	US-201514869965-A
Country	US
Kind code	B2
Filing date	Sep 29, 2015
Priority date	Sep 29, 2015
Publication date	Sep 11, 2018
Grant date	Sep 11, 2018

Abstract

Systems and a method for measuring at least one mechanical force in a stator of an electrical machine are provided. The stator of the electrical machine includes a multiple stacked metal lamina. At least one fiber Bragg grating (FBG) element is placed between two of the lamina, such as in a rotor-facing tooth of the lamina.

First claim

We claim:

1. A system for measuring at least one mechanical force in a stator of an electrical machine, the system comprising:
the stator in the electrical machine, wherein the stator comprises at least two stacked metal lamina, wherein each of the at least two stacked metal lamina comprises a tooth; and
a fiber Bragg grating (FBG) element placed between the two stacked metal lamina, the FBG element being placed on or in a surface of the tooth of one of the two stacked metal lamina, the surface being opposite a surface of the other of the two stacked metal lamina.

2. The system of claim 1 , wherein the stator comprises an inner stator structure, the inner stator structure comprising a tooth, and
wherein the FBG element is placed within the tooth.

3. The system of claim 1 , wherein the FBG element is aligned to measure a radial force within the stator.

4. The system of claim 1 , further comprising at least one other FBG element.

5. The system of claim 4 , wherein the FBG element and the at least one other FBG element are aligned for measuring forces in different directions.

6. The system of claim 5 , wherein at least two FBG elements of the FBG element and the at least one other FBG element are aligned perpendicularly.

7. The system of claim 4 , wherein the electrical machine further comprises different electrical phases,
wherein the at least two stacked metal lamina comprise multiple teeth,
wherein the multiple teeth of the at least two stacked lamina form multiple bars, each bar of the multiple bars being assigned to one of the electrical phases, and
wherein at least one tooth of every electrical phase is equipped with an FBG element or one set of FBG elements.

8. The system of claim 4 , wherein at least two FBG elements of the FBG element and the at least one other FBG element are chained within one optical wire, the two FBG elements being distributed and aligned for covering force of multiple directions.

9. The system of claim 1 , wherein the FBG element is connected to an optical wiring, and
wherein at least one of the two stacked metal lamina, between which the FBG element or wiring of the FBG element is placed, has a cut or depression for containing the FBG element, optical wiring, or a combination thereof.

10. The system of claim 1 , wherein the FBG element is bonded or glued to a surface of at least one of the two stacked metal lamina.

11. The system of claim 1 , further comprising at least one other FBG element,
wherein the FBG element and the at least one other FBG element are distributed on one common optical wire.

12. The system of claim 1 , wherein the FBG element is connected to an optical wiring, and
wherein the optical wiring is at least partly placed along an electrical wiring of a stator coil.

13. The system of claim 1 , further comprising at least one temperature sensor in the vicinity of the FBG element.

14. The system of claim 1 , wherein the FBG element is connected to an optical wiring, and
wherein the optical wiring is displaced at least partly between two lamina blades.

15. The system of claim 1 , wherein the FBG element is located in a rotor-facing tooth of the at least two stacked metal lamina.

Assignees

• Faria Cassio
• Santos Fabio
• Siemens Ind Software Nv

Inventors

• Faria Cassio
• Santos Fabio

Classifications

• G01L5/166

  using photoelectric means · CPC title

• G01D5/35316

  using a Bragg gratings · CPC title

• G01L1/00

  Measuring force or stress, in general (measuring force due to impact G01L5/00) · CPC title

• G01K13/08

  in rotary movement · CPC title

• G01K11/32

  using changes in transmittance, scattering or luminescence in optical fibres · CPC title