Insulating flange plate structure of rotor of semi-direct-drive permanent magnet synchronous wind driven generator

Abstract

The utility model discloses a rotor insulation flange plate structure of a semi-direct-drive permanent magnet synchronous wind driven generator. The rotor insulation flange plate structure comprises an inner ring, an outer ring, an insulation tape and an insulation pin, a plurality of concave tables are formed on the inner wall of the inner ring, and at least two counterbores are formed in the inner wall of each concave table; the insulating tape is wound on the outer wall of the inner ring, and a step-shaped structure used for being in interference fit with the inner circle of the outer ring is formed on the surface of the insulating tape; the inner circle of the outer ring is in interference fit with the insulating tape through the step-shaped structure; the insulating pin is mounted in the counterbore and sequentially penetrates into the inner ring, the insulating tape and the outer ring; according to the utility model, the interference fit assembly of the insulating ring and the metal inner ring is changed into the tensioning force winding type integrated manufacturing and the interference fit of the insulating pin, so that the impact moment resistance of the insulating flange is improved, the condition of slipping between the metal inner ring and the metal outer ring caused by abnormal working conditions such as coupling slipping and load shedding is avoided, and the reliability of the insulating flange is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of wind generator rotor insulation flanges, in particular to a semi-direct drive permanent magnet synchronous wind generator rotor insulation flange structure. Background Art

[0002] Bearing failures account for a large proportion of failures during the operation of wind turbines. Among them, bearing electrocorrosion caused by shaft current can cause irreversible damage to the bearings. The fundamental cause of the shaft current is the common-mode voltage generated by the converter and the stray capacitance in the motor. The main reason is that the asymmetric magnetic circuit caused by the motor installation deviation induces shaft voltage at both ends of the shaft. At the same time, the generator shaft extension, bearings, oil film and base provide a closed loop, which then generates shaft current. After the shaft current breaks through the oil film, it will produce pits on the surface of the bearing raceway, increase friction, and reduce the service life of the bearing. In summary, the formation of shaft current shortens the life of the bearing, may cause vibration and burning of the generator, and seriously affect the normal operation of the generator.

[0003] In order to suppress shaft current, permanent magnet synchronous generators currently usually adopt a blocking method, that is, using a rotor insulation flange. The rotor insulation flange performs electrical insulation between the rotor and the bearing, which plays a role in blocking shaft current. The existing rotor insulation flange is mainly composed of an inner ring, an outer ring, an insulation ring, and screws. The inner and outer rings and the insulation rings are interference fit, and the inner and outer rings and the insulation rings are fixed mainly by screws and insulating gaskets. However, the insulation flange will encounter various extreme working conditions during operation, such as coupling slippage, load shedding, etc.; or the insulation flange has artificial quality defects, that is, the insulation ring is not glued or is not processed according to the drawing size. These abnormal conditions cause the insulation flange to be subjected to huge impact torque, the insulation gasket is impacted to cause fatigue fracture of the screws, relative sliding occurs between the inner and outer rings, and finally the insulation flange is damaged. Utility Model Content

[0004] The utility model aims to solve the deficiencies in the prior art and provides an insulating flange structure for a rotor of a semi-direct-drive permanent-magnet synchronous wind turbine generator. By improving the insulating flange structure of the existing semi-direct-drive permanent-magnet synchronous wind turbine generator rotor, the problem of slippage of the inner and outer rings of the insulating flange under abnormal working conditions of the generator can be effectively solved. At the same time, the cooperation of insulating pins and countersunk holes on the inner wall of the inner ring recess is adopted to increase the reliability of the connection, and the insulating ring and insulating pin can be better utilized to block the shaft current, thereby ensuring the stability of the structure and the safe and reliable operation of the wind turbine generator.

[0005] To achieve the above-mentioned purpose, the technical solution provided by the utility model is as follows: an insulating flange structure of a rotor of a semi-direct-drive permanent magnet synchronous wind generator, comprising an inner ring, an outer ring, an insulating belt and an insulating pin; a circle of concentric mounting holes is formed on the inner ring, and the inner ring is connected to the hollow shaft of the semi-direct-drive permanent magnet synchronous wind generator through the concentric mounting holes, and a plurality of concave platforms are formed on the inner wall of the inner ring, and the inner wall of each concave platform is provided with at least two countersunk holes; the insulating belt is wound on the outer wall of the inner ring, and a step-shaped structure for interference fitting with the inner circle of the outer ring is formed on the surface of the insulating belt; the inner circle of the outer ring forms an interference fit with the insulating belt through the step-shaped structure, and an inner ring concentric mounting hole and an outer ring concentric mounting hole are formed on the outer ring, and the outer ring is connected to the generator rotor through the outer ring concentric mounting hole, and the outer ring is connected to the coupling through the inner ring concentric mounting hole; the insulating pin is installed in the countersunk hole, and is inserted into the inner ring, the insulating belt and the outer ring in sequence, and is used to fix the inner ring, the insulating belt and the outer ring.

[0006] Furthermore, an epoxy adhesive layer is provided on the surface of the insulating tape.

[0007] Furthermore, an epoxy adhesive layer is provided on the surface of the insulating pin.

[0008] Furthermore, an epoxy adhesive layer is provided on the inner circular surface of the outer ring.

[0009] Furthermore, the epoxy adhesive layer includes an EP139 epoxy adhesive layer and a WSR6101 epoxy adhesive layer.

[0010] Furthermore, the inner ring is a metal inner ring, and the outer ring is a metal outer ring.

[0011] Furthermore, the inner ring is a Q355D inner ring, and the outer ring is a Q355D outer ring.

[0012] Furthermore, the insulating tape is EPGC22 insulating tape.

[0013] Furthermore, the insulating pin is a D344 insulating pin.

[0014] Furthermore, there are five concave platforms.

[0015] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0016] 1. The utility model eliminates the interference fit between the metal inner ring and the insulating tape and directly applies a winding force to wrap the insulating tape around the inner ring that has been processed once, which can effectively avoid the problem of artificial quality defects, that is, the failure of the insulating ring due to interference fit when the insulating ring is not coated with glue or is not processed according to the drawing size;

[0017] 2. In the utility model, the interference fit assembly between the insulating ring and the metal inner ring is changed to a tension-winding integrated production and the interference fit of the insulating pin improves the impact torque resistance of the insulating flange, avoids the slippage between the metal inner and outer rings caused by abnormal working conditions such as coupling slippage and load shedding, and improves the reliability of the insulating flange;

[0018] 3. The utility model blocks the generation of shaft current through the electrical insulation of the insulating pins and the insulating tape, reduces the probability of irreversible damage to the bearing caused by electrical corrosion of the bearing, increases the service life of the bearing, and ensures the safe operation of the generator. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the utility model.

[0020] Figure 2 It is a structural sectional view of the utility model.

[0021] Figure 3 This is a schematic diagram of the installation structure of the inner ring and the insulating tape processed at one time.

[0022] Figure 4 This is a schematic diagram of the installation structure of the inner ring and the insulating tape after machining.

[0023] Figure 5 Schematic diagram of the assembly process of the inner ring and the insulating tape.

[0024] Figure 6 It is a schematic diagram of the overall assembly process of the utility model.

[0025] Figure 7 This is an assembly flow chart of the utility model. DETAILED DESCRIPTION

[0026] The utility model is further described below in conjunction with specific embodiments.

[0027] Example 1

[0028] See also Figure 1 to Figure 2As shown, the semi-direct-drive permanent magnet synchronous wind turbine rotor insulation flange structure provided by this embodiment includes an inner ring 1, an outer ring 2, an insulation belt 3 and an insulation pin 4; a circle of concentric mounting holes 101 is formed on the inner ring 1, and the inner ring 1 is connected to the hollow shaft (not shown in the figure) of the semi-direct-drive permanent magnet synchronous wind turbine through the concentric mounting holes 101, and the inner wall of the inner ring 1 is formed with five concave platforms 102, and the inner wall of each concave platform 102 is provided with at least two countersunk holes 103; the insulation belt 3 is wound on the outer wall of the inner ring 1, and the surface of the insulation belt 3 is formed with a hole for connecting with the outer ring 2. A stepped structure 301 for interference fit of the inner circle; the inner circle of the outer ring 2 forms an interference fit with the insulating belt 3 through the stepped structure 301, an inner ring concentric mounting hole 201 and an outer ring concentric mounting hole 202 are formed on the outer ring 2, the outer ring 2 is connected to the generator rotor (not shown in the figure) through the outer ring concentric mounting hole 202, and the outer ring 2 is connected to the coupling (not shown in the figure) through the inner ring concentric mounting hole 201; the insulating pin 4 is installed in the countersunk hole 103, and is inserted into the inner ring 1, the insulating belt 3 and the outer ring 2 in sequence, for fixing the inner ring 1, the insulating belt 3 and the outer ring 2.

[0029] The inner and outer rings are made of Q355D material; the insulating tape is made of EPGC22 (epoxy glass cloth laminated tube) material, which has good oil resistance and corrosion resistance, high mechanical strength at high temperature, and is machined after winding to increase the matching accuracy with the inner circle of the metal outer ring; the insulating pin is made of D344 (epoxy glass cloth laminated board) material, which has high bending, tensile and compression properties;

[0030] Example 2

[0031] See also Figures 3 to 7 As shown, the assembly method of the semi-direct drive permanent magnet synchronous wind turbine rotor insulation flange structure provided in this embodiment is as follows:

[0032] First, the first-processed insulating tape 6 and the first-processed inner ring 5 are non-interference fitted, the first-processed insulating tape 6 is wound around the first-processed inner ring 5, a winding force is applied during the winding process, and epoxy glue EP139 or WSR6101 is applied while winding to form a first-processed inner ring wound insulating tape structure; then the first-processed insulating tape 6 is machined to form a step-shaped structure 7; the step-shaped structure 7 is interference fitted with the inner circle of the outer ring, and epoxy glue EP139 or WSR6101 is applied on the surface, and no gap is allowed after assembly;

[0033] Finally, the insulating flange is machined as a whole: the inner ring 5 is provided with a circle of concentric mounting holes, which is connected to the hollow shaft of the permanent magnet synchronous generator; the outer ring 8 is interference fitted on the step-shaped structure 7 to match it, and the outer ring 8 is provided with inner and outer sets of concentric mounting holes, the outer ring holes are connected to the rotor bracket of the permanent magnet synchronous generator, and the inner ring holes are connected to the coupling; after the flange is machined as a whole, five concave platforms are formed in the middle of the inner ring 5, and two countersunk holes 9 are provided on the inner wall of each concave platform; the insulating pin 4 is installed in the countersunk hole 9 on the inner wall of the concave platform, and cooperates with the inner ring 5, the insulating belt and the outer ring 8 with a small gap, and epoxy glue EP139 or WSR6101 is applied on the surface of the insulating pin 4 to fill the small gap.

[0034] The utility model optimizes and improves the existing permanent magnet synchronous generator rotor insulation flange structure from the following two aspects:

[0035] 1. Wrap the insulating tape around the inner ring of the flange that has been processed once, apply the winding force, and apply epoxy glue while wrapping to form a structure of the inner ring wrapped with the insulating tape that has been processed once. Then machine the insulating tape to make a step, and then perform interference fit with the outer ring, and finally perform overall machining. The interference fit assembly between the insulating ring and the metal inner ring is changed to a tension-winding integrated production. The inner ring wrapped with insulating tape effectively avoids human quality defects, as well as the problem of interference fit failure with the insulating ring when glue is not applied on the insulating ring or the processing is not performed according to the drawing size, reducing the risk of fatigue fracture failure of the fixings between the inner and outer rings.

[0036] Second: The inner ring is machined, and five concave platforms are distributed in the center of the inner ring. Two countersunk holes are set on the inner wall of each concave platform, and the insulating pins are distributed in the countersunk holes along the circumference. The countersunk hole structure effectively eliminates the problem of weak structure in the edge area of ​​the bolt caused by tightening the bolts, and reduces the risk of cracking of the inner ring of the flange. At the same time, the interference fit of the insulating pin and the one-piece winding of the insulating ring tension force improve the impact torque resistance of the insulating flange, avoid the slippage between the metal inner and outer rings caused by abnormal working conditions such as coupling slippage and load shedding, and improve the reliability of the insulating flange.

[0037] The above improvements improve the reliability of the insulating flange. At the same time, the electrical insulation of the insulating pins and the insulating tape blocks the generation of shaft current, reduces the probability of irreversible damage to the bearings caused by bearing electrical corrosion, increases the service life of the bearings, and ensures the safe operation of the generator.

[0038] The embodiments described above are only preferred embodiments of the present invention, and are not intended to limit the scope of implementation of the present invention. Therefore, all changes made based on the shape and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A semi-direct drive permanent magnet synchronous wind turbine rotor insulation flange structure, characterized in that: It comprises an inner ring, an outer ring, an insulating belt and an insulating pin; a circle of concentric mounting holes is formed on the inner ring, the inner ring is connected to the hollow shaft of the semi-direct-drive permanent magnet synchronous wind turbine through the concentric mounting holes, a plurality of recesses are formed on the inner wall of the inner ring, and at least two countersunk holes are arranged on the inner wall of each recess; the insulating belt is wound on the outer wall of the inner ring, and a step-like structure is formed on the surface of the insulating belt for interference fitting with the inner circle of the outer ring; the inner circle of the outer ring forms an interference fit with the insulating belt through the step-like structure, an inner ring concentric mounting hole and an outer ring concentric mounting hole are formed on the outer ring, the outer ring is connected to the generator rotor through the outer ring concentric mounting hole, and the outer ring is connected to the coupling through the inner ring concentric mounting hole; the insulating pin is installed in the countersunk hole, and is inserted into the inner ring, the insulating belt and the outer ring in sequence, and is used to fix the inner ring, the insulating belt and the outer ring.

2. The semi-direct drive permanent magnet synchronous wind turbine rotor insulation flange structure according to claim 1 is characterized in that: An epoxy adhesive layer is provided on the surface of the insulating tape.

3. The semi-direct drive permanent magnet synchronous wind turbine rotor insulation flange structure according to claim 1, characterized in that: An epoxy adhesive layer is provided on the surface of the insulating pin.

4. The semi-direct drive permanent magnet synchronous wind turbine rotor insulation flange structure according to claim 1, characterized in that: The inner circular surface of the outer ring is provided with an epoxy adhesive layer.

5. A semi-direct drive permanent magnet synchronous wind turbine rotor insulation flange structure according to any one of claims 2 to 4, characterized in that: The epoxy adhesive layer includes an EP139 epoxy adhesive layer and a WSR6101 epoxy adhesive layer.

6. The semi-direct drive permanent magnet synchronous wind turbine rotor insulation flange structure according to claim 1, characterized in that: The inner ring is a metal inner ring, and the outer ring is a metal outer ring.

7. The semi-direct drive permanent magnet synchronous wind turbine rotor insulation flange structure according to claim 6, characterized in that: The inner ring is a Q355D inner ring, and the outer ring is a Q355D outer ring.

8. The semi-direct drive permanent magnet synchronous wind turbine rotor insulation flange structure according to claim 1, characterized in that: The insulating tape is EPGC22 insulating tape.

9. The semi-direct drive permanent magnet synchronous wind turbine rotor insulation flange structure according to claim 1, characterized in that: The insulating pin is a D344 insulating pin.

10. The semi-direct drive permanent magnet synchronous wind turbine rotor insulation flange structure according to claim 1, characterized in that: There are five concave platforms.

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