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By a News Reporter-Staff News Editor at Energy Business Daily -- Wobben Properties GmbH (Aurich, Germany) has been issued patent number 11236732, according to news reporting originating out of Alexandria, Virginia, by NewsRx editors.
The patent’s inventor is Rosenbusch, Peter (Rueil-Malmaison, FR).
This patent was filed on August 27, 2019 and was published online on February 1, 2022.
From the background information supplied by the inventors, news correspondents obtained the following quote:
“Technical Field
“The present invention relates to a generator, in particular of a wind power installation. The invention further relates to a measuring device for a generator. The invention furthermore relates to a method for operating a generator. The invention further relates to a wind power installation and to a method for operating a wind power installation.
“Description of the Related Art
“Wind power installations are generally known and they generate electric current from wind by means of a generator. Provided herein, a generator is intended to be understood as meaning, in particular, a synchronous generator, preferably a ring generator, an asynchronous generator or a doubly-fed asynchronous generator.”
Supplementing the background information on this patent, NewsRx reporters also obtained the inventor’s summary information for this patent: “The present invention relates to a generator, in particular of a wind power installation, for generating electric current, comprising a rotor and a stator having stator teeth and grooves arranged between said stator teeth for receiving at least one stator winding. The invention further relates to a measuring device for a generator. The invention furthermore relates to a method for operating a generator. The invention further relates to a wind power installation and to a method for operating a wind power installation.
“Provided is a generator and method of determining the deflection of at least one stator tooth without interfering in the geometry of the generator.
“A generator may be, in particular, a synchronous generator, an asynchronous generator or a doubly-fed asynchronous generator. An example of a synchronous generator, wherein other generators, including other synchronous generators, can be used as well, is a multi-pole synchronous ring generator of a wind power installation. Such a multi-pole synchronous ring generator of a wind power installation has a multiplicity of stator teeth, in particular at least 48 stator teeth, frequently even significantly more stator teeth, such as, in particular, 96 stator teeth or even more stator teeth. The magnetically active region of the synchronous generator, namely both of the rotor and of the stator, is arranged in an annular region around the axis of rotation of the synchronous generator.
“The stator is provided with teeth and grooves arranged between said teeth. The grooves receive a stator winding or a plurality of stator windings, with the result that the stator winding is arranged through the grooves and around the stator teeth. A measuring device is provided to determine the deflection of at least one stator tooth of the stator in connection with the generator, wherein the measuring device is connected to at least one measuring sensor, which is embodied as a strain gauge and arranged in the air gap between the rotor and the stator. A deformation of the stator tooth caused by the magnetic interaction generates a signal that represents a strain, said signal being transferred from the measuring sensor to the measuring device connected to said measuring sensor for signaling purposes. In contrast to measurement for example of the torque by means of acceleration sensors, which are arranged on the aerodynamic rotor, generally on the rotor blades thereof, or on the generator structure, that is to say on the elements manufactured in steel production, the deflection is determined in the air gap of the generator at the location of the conversion from mechanical to electrical energy. In this way, the electromechanical energy conversion can be measured directly.
“A further advantage consists in the fact that the measuring sensor embodied as a strain gauge and arranged in the air gap is not influenced by, in particular mechanical, oscillations that do not originate from the magnetic forces. In addition, strain gauges are space-saving and cost-effective. This also makes it possible to retrofit existing generators with at least one measuring sensor. It is possible to determine the deflection of a single stator tooth caused by the magnetic forces acting thereon by means of the strain gauge without having to change the magnetically active part for arranging the at least one measuring sensor in any way.”
The claims supplied by the inventors are:
“1. A generator for generating electric current, the generator comprising: a rotor; a stator having a plurality of stator teeth and a plurality of grooves arranged between the plurality of stator teeth, respectively, wherein the plurality of groves are configured to receive at least one stator winding; a strain gauge coupled between two adjacent stator teeth of the plurality of stator teeth and configured to measure a deflection, wherein the strain gauge is arranged in an air gap between the stator and the rotor; and a measuring device configured to receive a signal from the strain gauge indicative of the measured deflection.
“2. The generator as claimed in claim 1, wherein the strain gauge is an electrical strain gauge or optical strain gauge.
“3. The generator as claimed in claim 1, wherein the strain gauge is configured to determine a deflection of a stator tooth of the plurality of stator teeth from a change in signals generated by the measuring device.
“4. The generator as claimed in claim 1, wherein the strain gauge spans two directly or indirectly adjacent stator teeth and extends in a tangential direction.
“5. The generator as claimed in claim 1, wherein the strain gauge comprises an optical waveguide section arranged on support elements arranged at a distance from one another by way of a groove between adjacent stator teeth.
“6. The generator as claimed in claim 5, wherein the optical waveguide section has a Bragg gratings and is positioned substantially centrally between adjacent stator teeth.
“7. The generator as claimed in claim 5, wherein at least two optical waveguide sections are arranged on adjacent stator teeth by support elements, wherein the at least two optical waveguide sections have different orientations with respect to the groove.
“8. The generator as claimed in claim 7, wherein the at least two optical waveguide sections are rotated 45° with respect to the groove.
“9. The generator as claimed in claim 1, wherein the measuring device is configured to determine a torque of the generator.
“10. The generator as claimed in claim 1, wherein the generator is at least one of a synchronous generator, an asynchronous generator or a doubly-fed asynchronous generator.
“11. A method for operating a generator of a wind power installation, for generating electric current, the generator comprising a rotor and a stator having stator teeth and grooves arranged between the stator teeth for receiving a stator winding, the generator including a measuring device and at least one strain gauge, the method comprising: operating a strain gauge to determine a deflection of at least one stator tooth of the stator in connection with the generator, the strain gauge being arranged in an air gap between the stator and the rotor of the generator; and providing measurement values indicative of the deflection to the measuring device of the at least one stator tooth.
“12. The method as claimed in claim 11, comprising actuating a field current of the generator depending on the determined deflection of the at least one stator tooth.
“13. A wind power installation comprising the generator as claimed in claim 1.
“14. A method for operating a wind power installation comprising: controlling a generator based on measurement values of one or more strain gauges, wherein the one or more strain gauges are arranged in an air gap between a stator and a rotor of the generator.”
For the URL and additional information on this patent, see: Rosenbusch, Peter. Generator, measuring device, use of a measuring device, method for operating a generator, wind energy installation and method for operating a wind energy installation. U.S. Patent Number 11236732, filed August 27, 2019, and published online on February 1, 2022. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=11236732.PN.&OS=PN/11236732RS=PN/11236732
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