Optical measurement device in a pressed-in conductor bar in an electrical machine

• US 6,721,470 B2
• Filed: 06/24/2002
• Issued: 04/13/2004
• Est. Priority Date: 12/23/1999
• Status: Expired due to Fees

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Krämmer, Peter, Theune, Nils Michael, Bosselmann, Thomas, Willsch, Michael
• Primary Examiner(s): Ullah, Akm Enayet
• Assistant Examiner(s): Petkovsek, Daniel
• Application Number:
  US10/178,254
• Publication Number:
  US 20020196994A1
• Time in Patent Office: 659 Days
• Field of Search: 385/12, 385/37, 374/161, 250/227.14
• US Class Current: 385/12
• CPC Class Codes: G01B 11/14 for measuring distance or clearance between spaced objects or spaced apertures G01B11/26 takes precedence; rangefinders G01C3/00
• CPC Class Codes: G01B 11/26 for measuring angles or tapers; for testing the alignment of axes
• CPC Class Codes: G01D 5/35383 using multiple sensor devices using multiplexing techniques

Abstract

An optical measuring device includes at least one optical sensor, an optical waveguide connected to the optical sensor, and an evaluation unit. The optical measuring device is intended for an electrical machine including at least one conductor that is pressed into a groove of a base body, the groove having two groove lateral walls. The optical sensor and a part of the optical waveguide that is located in a proximity of the sensor are disposed in the area of the groove on a narrow side of the conductor that faces away from both groove lateral walls.

Claims

1. An optical measurement device for an electrical appliance having a base body with at least one slot having two slot side walls and at least one electrical conductor having a longitudinal face facing away from the two slot side walls and a plurality of conductor elements insulated from one another, the conductor pressed into the at least one slot, the optical measurement device comprising:

at least one Faser-Bragg grating sensor;

at least one optical waveguide;

having a part adjacent said at least one Faser-Bragg grating sensor; and

being connected to said at least one Faser-Bragg grating sensor;

said at least one Faser-Bragg grating sensor to be interrogated by a light signal through said at least one optical waveguide;

an evaluation unit optically connected to said at least one Faser-Bragg grating sensor;

said at least one Faser-Bragg grating sensor and said part to be disposed in a region of the slot at the longitudinal face; and

at least one protective strip to be disposed at the longitudinal face.

2. The measurement device according to claim 1, wherein:

said at least one protective strip is two protective strips disposed laterally alongside one another; and

said at least one Faser-Bragg grating sensor and said part are disposed between said two protective strips.

3. The measurement device according to claim 1, wherein said at least one Faser-Bragg grating sensor and said part are at least partially surrounded by said at least one protective strip.

4. The measurement device according to claim 1, wherein said at least one Faser-Bragg grating sensor and said part are embedded in said at least one protective strip.

5. The measurement device according to claim 1, including a mount, said at least one protective strip defining a cutout for receiving said mount, and said at least one Faser-Bragg grating sensor being fixed at said mount.

6. The measurement device according to claim 1, including a tube, said at least one Faser-Bragg grating sensor and said part disposed in said tube.

7. The measurement device according to claim 6, wherein said tube is of quartz glass.

8. The measurement device according to claim 1, wherein:

said at least one electrical conductor has an outer electrical insulation; and

said at least one Faser-Bragg grating sensor and said part are disposed under said outer electrical insulation.

9. The measurement device according to claim 1, wherein said at least one Faser-Bragg grating sensor is an optical temperature sensor.

10. The measurement device according to claim 1, wherein said at least one protective strip is connected to said at least one optical waveguide.

11. The measurement device according to claim 10, wherein:

said at least one protective strip is two protective strips; and

said at least one optical waveguide is between said two protective strips.

12. The measurement device according to claim 10, wherein:

said at least one protective strip is one protective strip; and

said at least one optical waveguide is in said protective strip.

13. An optical measurement device for an electrical generator having a stator, a core, a stator winding, and a rotor, the core having at least one slot with two slot side walls, the stator winding having at least one electrical conductor with a longitudinal face facing the rotor and a plurality of conductor elements insulated from one another, the conductor pressed into the at least one slot, the optical measurement device comprising:

at least one Faser-Bragg grating sensor;

at least one optical waveguide;

having a part adjacent said at least one Faser-Bragg grating sensor; and

being connected to said at least one Faser-Bragg grating sensor;

said at least one Faser-Bragg grating sensor to be interrogated by a light signal through said at least one optical waveguide;

an evaluation unit optically connected to said at least one Faser-Bragg grating sensor;

said at least one Faser-Bragg grating sensor and said part to be disposed in a region of the slot at the longitudinal face; and

at least one protective strip to be disposed at the longitudinal face.

14. In an electrical appliance having a base body with at least one slot having two slot side walls and at least one electrical conductor having a longitudinal face facing away from the two slot side walls and a plurality of conductor elements insulated from one another, the conductor pressed into the at least one slot, an optical measurement device comprising:

at least one Faser-Bragg grating sensor;

at least one optical waveguide;

having a part adjacent said at least one Faser-Bragg grating sensor; and

being connected to said at least one Faser-Bragg grating sensor;

said at least one Faser-Bragg grating sensor to be interrogated by a light signal through said at least one optical waveguide;

an evaluation unit optically connected to said at least one Faser-Bragg grating sensor;

said at least one Faser-Bragg grating sensor and said part to be disposed in a region of the slot at the longitudinal face; and

at least one protective strip to be disposed at the longitudinal face.

15. In an electrical generator having a stator, a core, a stator winding, and a rotor, the core having at least one slot with two slot side walls, the stator winding having at least one electrical conductor with a longitudinal face facing the rotor and a plurality of conductor elements insulated from one another, the conductor pressed into the at least one slot, an optical measurement device comprising:

at least one Faser-Bragg grating sensor;

at least one optical waveguide;

having a part adjacent said at least one Faser-Bragg grating sensor; and

being connected to said at least one Faser-Bragg grating sensor;

said at least one Faser-Bragg grating sensor to be interrogated by a light signal through said at least one optical waveguide;

an evaluation unit optically connected to said at least one Faser-Bragg grating sensor;

said at least one Faser-Bragg grating sensor and said part to be disposed in a region of the slot at the longitudinal face; and

at least one protective strip to be disposed at the longitudinal face.