Doubly-fed rotor end binding weftless tape supporting device
By combining a split support ring and an adjustable stud, the bending and deformation problem of the non-woven belt tied to the rotor end of the doubly fed wind turbine is solved, ensuring binding stability and making the device easy to disassemble, thus avoiding damage to the coil insulation.
Patent Information
- Application Number
- CN202511179484.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-22
- Publication Date
- 2025-11-04
AI Technical Summary
In the existing technology, the non-woven tape tied to the rotor end of the doubly fed wind turbine is prone to bending and deformation during the binding process, and the device is difficult to disassemble after curing, which damages the coil insulation.
The design employs a combination of a split support ring and an adjustable stud. The split support ring fits tightly against the rotor shaft, and the radial position of the support ring is adjusted using the adjustable stud. Combined with flexible material for isolation and protection, this ensures stable binding of the non-woven tape and easy disassembly.
It improves the stability of the coil ends during the non-woven tape binding process and allows the device to be easily removed from the rotor after curing without damaging the coil insulation.
Smart Images
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Abstract
Description
Technical Field
[0001] This invention relates to the field of fixed installation at the end of motor rotors, and more particularly to a non-woven belt support device for binding the end of a doubly fed rotor. Background Technology
[0002] Doubly fed wind turbines are widely used in the wind power generation field. Their rotor end windings need to be fixed by non-woven tape to withstand the centrifugal force during high-speed rotation. Traditional binding processes usually involve impregnating non-woven tape with epoxy resin and then curing it. As the power of generators increases, non-woven tape binding has become an important method for fixing the rotor end in the field of doubly fed wind turbines. With the increase in generator power, the number of turns, binding thickness, and binding force of the non-woven tape binding also increase sharply. Ensuring that the coil end does not bend or deform during the binding process has become a major challenge.
[0003] In existing technologies, such as Figure 1 A schematic diagram of end collapse of the non-woven tape. There are several main methods for binding non-woven tape: 1. When binding the non-woven tape, no non-woven tape support device is installed at the end of the rotor coil. The end collapse problem is solved by reducing the binding tension of the non-woven tape (the cantilevered part) to control the amount of coil deformation during binding. Disadvantage: Uneven or insufficient binding tension results in the non-woven tape not forming a dense structure after curing and glue removal, which cannot withstand the centrifugal force when the rotor rotates at high speed. 2. Install an end support device, which can be a single unit or two semicircles. Disadvantage: After the rotor non-woven tape is baked and cured, the high tension of the non-woven tape makes it impossible to remove the device from the rotor during disassembly. Forced disassembly will damage the coil insulation. Summary of the Invention
[0004] The present invention aims to disclose a support device for binding non-woven tape at the end of a doubly fed rotor, which solves the problem of bending and deformation of the coil end towards the rotation axis when binding non-woven tape at the rotor end, improves the stability of non-woven tape, and ensures that the device can be successfully demolded after the non-woven tape is baked and cured.
[0005] A doubly fed rotor end-binding non-woven belt support device includes a split support ring, an adjustable stud, and a split fixing seat. The split support ring is composed of at least three arc-shaped ring segments spliced together. Each arc-shaped ring segment is provided with a non-through circular hole. One end of the adjustable stud is connected to the non-through circular hole and the other end is connected to the split fixing seat. The split fixing seat is composed of at least three arc-shaped support seats.
[0006] Furthermore, the inner circle of each arc-shaped ring segment is in close contact with the rotor shaft; a non-through circular hole is provided on the inner circle of the arc-shaped ring segment, wherein U-shaped grooves are respectively opened at both ends of the arc-shaped ring segment.
[0007] Furthermore, each arc-shaped support consists of an outer arc ring segment and an inner stiffener, with gaps between adjacent arc ring segments. The outer side of the arc ring segment supports the end of the rotor coil, and the stiffener is provided with a threaded through hole that connects to an adjustable stud.
[0008] Furthermore, the adjustable stud has threads at the contact end with the split-type fixed base, but no threads at the contact end with the split-type support ring.
[0009] Furthermore, the middle section of the stud has a square notch for easy adjustment with a wrench.
[0010] Furthermore, the parts of the split support ring and split fixing base that come into contact with the product are isolated and protected with flexible materials.
[0011] Furthermore, the number of arc-shaped support seats is consistent with the number of arc-shaped ring segments.
[0012] In this invention, the adjustable stud can be turned to adjust the diameter and is used to tighten the coil. Simultaneously, flexible material is used for isolation and protection at the contact points between the device and the product. Split-type support ring: Composed of three arc-shaped ring segments, the inner circle fits tightly against the rotor shaft, and the outer circle has a non-through hole for fixing and limiting the adjustable stud. Each end has a U-shaped groove to avoid the rotor lead wire position. Split-type fixing seat: Composed of three arc-shaped support seats, with gaps between adjacent arc-shaped support seats to ensure no interference during the diameter change process; the outer circle supports the rotor coil end, and the rib plate has a threaded through hole. 3. Adjustable stud: The stud has no thread at the contact end with the split-type support ring, but has threads at the contact end with the split-type fixing seat. A square locking section is provided in the middle for subsequent adjustment with a wrench.
[0013] The beneficial effects of this invention are as follows: The adjustable structure of this invention allows for the binding and support of non-woven tape on rotors of different outer diameters. Simultaneously, it ensures that the device can be smoothly removed from the rotor after the non-woven tape has cured without damaging the coil insulation. Attached Figure Description
[0014] Figure 1 Schematic diagram of the collapse at the end of the non-woven belt; Figure 2 A schematic diagram of the structure of the device of the present invention used at the D end; Figure 3 A schematic diagram of the structure of the device of the present invention used at the N-terminus; Figure 4 1. A schematic diagram of the split support ring structure; Figure 5 Schematic diagram of the split-type fixing base at end D Figure 6 A schematic diagram of the split-type fixing base at the N end; Figure 7 A schematic diagram of the binding structure of the present invention with the N end of the doubly fed rotor. Figure 8 A schematic diagram of the structure of the present invention and the binding of the end D of the doubly fed rotor.
[0015] List of reference numerals in the attached diagram: Wherein 1-split support ring; 2-split fixing seat; 3-adjustable stud; 11-arc ring segment; 12-U-shaped groove; 21-circular arc ring segment; 22-rib plate; 211-slot. Detailed Implementation
[0016] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, and the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.
[0017] like Figure 1-8 As shown, a doubly fed rotor end binding non-woven belt support device according to this embodiment includes a split support ring 1, an adjustable stud 3, and a split fixing seat 2. The split support ring 1 is composed of three arc-shaped ring segments 11 spliced together; each arc-shaped ring segment 11 is provided with a non-through circular hole; one end of the adjustable stud 3 is connected to the non-through circular hole and the other end is connected to the split fixing seat 2; the split fixing seat 2 is composed of three arc-shaped support seats.
[0018] The inner circle of each arc-shaped ring segment 11 is in close contact with the rotor shaft; a non-through circular hole is provided on the inner circle of the arc-shaped ring segment 11, wherein U-shaped grooves 12 are respectively provided at both ends of the arc-shaped ring segment 11.
[0019] Each arc-shaped support consists of an outer arc ring segment 21 and an inner stiffener 22. There is a gap between adjacent arc ring segments 21. The outer side of the arc ring segment 21 supports the end of the rotor coil. The stiffener 22 is provided with a threaded through hole that connects to the adjustable stud 3.
[0020] The adjustable stud 3 has threads at the contact end with the split-type fixed base 2, but no threads at the contact end with the split-type support ring 1.
[0021] The stud has a square notch in the middle section for easy adjustment with a wrench.
[0022] The method of use in this embodiment is as follows: First, screw the adjustable stud 3 into the screw hole of the split support ring, and place the split fixing seat on the rotor shaft, with the inner circle fitting against the shaft. Then, insert the other end of the split support ring and the adjustable stud into the hole of the split fixing seat. Use a wrench to adjust the adjustable stud so that the split support ring moves upward and tightens the lower part of the coil. Use a 1mm thick polyaramid felt spacer between the split fixing seat and the rotor shaft, and use a 0.5mm thick polytetrafluoroethylene plate spacer between the split support ring and the rotor coil.
[0023] The technical means disclosed in this invention are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features.
Claims
1. A doubly fed rotor end-binding non-woven belt support device, characterized in that: It includes a split support ring (1), an adjustable stud (3), and a split fixing seat (2). The split support ring (1) is composed of at least three arc-shaped ring segments (11) spliced together. Each arc-shaped ring segment (11) is provided with a non-through circular hole. One end of the adjustable stud (3) is connected to the non-through circular hole and the other end is connected to the split fixing seat (2). The split fixing seat (2) is composed of at least three arc-shaped support seats.
2. The doubly fed rotor end binding non-woven belt support device according to claim 1, characterized in that: The inner circle of each arc-shaped ring segment (11) is in close contact with the rotor shaft; a non-through circular hole is provided on the inner circle of the arc-shaped ring segment (11), wherein U-shaped grooves (12) are respectively provided at both ends of the arc-shaped ring segment (11).
3. The doubly fed rotor end binding non-woven belt support device according to claim 1, characterized in that: Each arc support consists of an outer arc ring segment (21) and an inner stiffener (22). There is a gap between adjacent arc ring segments (21). The outer side of the arc ring segment (21) supports the end of the rotor coil. The stiffener (22) is provided with a threaded through hole that connects to an adjustable stud (3).
4. The doubly fed rotor end binding non-woven belt support device according to claim 3, characterized in that: The arc segment (21) located at the N end is provided with a slot (211).
5. The doubly fed rotor end binding non-woven belt support device according to claim 1, characterized in that: The adjustable stud (3) has threads at the contact end with the split-type fixed base (2), but no threads at the contact end with the split-type support ring (1).
6. A doubly fed rotor end-binding non-woven belt support device according to claim 1 or 5, characterized in that: The stud has a square notch in the middle section for easy adjustment with a wrench.
7. The doubly fed rotor end binding non-woven belt support device according to claim 1, characterized in that: The parts of the split support ring (1) and the split fixing base (2) that come into contact with the product are isolated and protected by flexible materials.
8. The doubly fed rotor end binding non-woven belt support device according to claim 1, characterized in that: The number of arc-shaped support bases is the same as the number of arc-shaped ring segments.