FIBER OPTIC MAGNETIC FLUX SENSOR FOR APPLICATION IN HIGH VOLTAGE GENERATOR STATOR BARS
First Claim
1. A magnetic flux sensor system for measuring magnetic flux in a stator core of a high voltage generator, said flux sensor system comprising:
- at least one magnetostrictive Bragg grating (MBG) sensor positioned relative to at least one stator bar in the stator core, said at least one MBG sensor including a fiber Bragg grating (FBG) formed in an optical fiber and an outer coating of a magnetostrictive material; and
an analysis device providing an optical input signal to the optical fiber and receiving a reflected optical signal from the at least one MBG sensor, wherein the reflected optical signal provides a measurement of the magnetic flux from the stator bar.
1 Assignment
0 Petitions
Accused Products
Abstract
A magnetic flux sensor for measuring the radial component of the magnetic flux impinging on a stator bar of a high voltage generator. The magnetic flux sensor includes a fiber Bragg grating formed in an optical fiber and enclosed within a magnetostrictive coating. The magnetostrictive coating responds to changes in magnetic flux by applying a strain on the fiber that changes the reflected wavelength of the Bragg grating that can be measured to provide a measurement of the flux. In one embodiment, one or more of the magnetic flux sensors is positioned directly within an insulating layer of the particular stator bar.
-
Citations
20 Claims
-
1. A magnetic flux sensor system for measuring magnetic flux in a stator core of a high voltage generator, said flux sensor system comprising:
-
at least one magnetostrictive Bragg grating (MBG) sensor positioned relative to at least one stator bar in the stator core, said at least one MBG sensor including a fiber Bragg grating (FBG) formed in an optical fiber and an outer coating of a magnetostrictive material; and an analysis device providing an optical input signal to the optical fiber and receiving a reflected optical signal from the at least one MBG sensor, wherein the reflected optical signal provides a measurement of the magnetic flux from the stator bar. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. A magnetic flux sensor system for measuring magnetic flux in a stator core of a high voltage generator, said flux sensor system comprising:
-
a plurality of magnetostrictive Bragg grating (MBG) sensors provided in a common optical fiber and spaced apart from each other, said plurality of MBG sensors each including a fiber Bragg grating (FBG) formed in the fiber and an outer coating of a magnetostrictive material, said plurality of MBG sensors being positioned within a slot between stator teeth in the stator core in proximity to a plurality of stacked stator bar strands; and an analysis device providing an optical input signal to the optical fiber and receiving a reflected optical signal from each of the plurality of MBG sensors, where each MBG sensor reflects an optical signal having a different wavelength, and wherein the reflected optical signals provide a measurement of the magnetic flux from the stator bar. - View Dependent Claims (14, 15, 16)
-
-
17. A stator core for a high voltage generator, said stator core comprising:
-
a core portion having a central bore, a series of circumferentially disposed slots in communication with the bore and stator teeth between the slots; at least one stator bar positioned within each slot in the core portion and being in electrical communication with each other and with stator end windings at ends of the stator core; and at least one magnetostrictive Bragg grating (MBG) sensor provided within at least one of the slots, said at least one MBG sensor including a fiber Bragg grating (FBG) formed in an optical fiber and an outer coating of a magnetostrictive material. - View Dependent Claims (18, 19, 20)
-
Specification