Limiting fixture and limiting process for core ventilation slots of large permanent magnet direct-drive wind turbine generator

Abstract

The present invention provides a large permanent magnet direct-drive wind turbine core ventilation slot limiting tooling, including a ventilation slot limiting tooling, the main body of which is clamped in the core laminations, a clamping ring and a first step portion are provided on the outer side wall of the middle part, the diameter of the clamping ring is larger than the diameter of the ventilation limiting tooling, and the first step portion is located below the clamping ring; a ventilation slot plate, including a first clamping ring portion and a support portion extending from the first clamping ring portion to the vertical direction thereof, the first clamping ring portion is clamped between the first step portion and the core laminations. After the present invention is improved, the difficulty of operation for employees is reduced, and there is no need to adjust the ventilation slots, which reduces the labor intensity of employees; it can prevent the ventilation slot plate and ventilation slots from protruding from the core surface, reduce rework, and improve the quality of the core laminations and the overall insulation quality.

Description

Technical Field

[0001] The invention relates to a limiting process method for ventilation slots in an iron core of a generator, and more specifically to a limiting tooling for ventilation slots in an iron core of a large permanent magnet direct-drive wind turbine generator. Background Art

[0002] During the lamination of the core of a large permanent magnet direct-drive wind turbine motor, ventilation slot structures are placed when the core punching sheets are stacked to a certain height due to ventilation requirements. Usually, ventilation slot plates are used, and ventilation slot sheets are added in some cases. Under normal circumstances, there is a large gap between the ventilation slot plates, ventilation slot sheets, and the fixing keys (for positioning) on ​​the core punching sheets, and there is space for left and right offsets, which will protrude from the core slots and pose a risk of scratching the coils. At present, the domestic market basically relies on slot sample bars to limit the position of ventilation slot plates and ventilation slot sheets, but in the motor manufacturing process, the number of slot sample bars installed is limited, and it is impossible to completely prevent ventilation slot plates and ventilation slot sheets from protruding from the core slots. When the ventilation slot plate protrudes from the core slot, it is necessary to manually knock on the isolation strip to adjust the position; when the ventilation slot sheet protrudes from the core slot, the position of the ventilation slot sheet can only be adjusted by removing the core or lifting the stacked punching sheets. Summary of the invention

[0003] The purpose of the present invention is to provide a method for limiting the ventilation slots in the core of a large permanent magnet direct-drive wind turbine generator, which can realize the ventilation slots protruding out of the core and has great difficulty in adjusting.

[0004] According to one aspect of the present invention, a large permanent magnet direct-drive wind turbine core ventilation slot limiting tooling is provided, comprising:

[0005] A ventilation slot limiting fixture, the main body of which is clamped in the core laminations, a clamping ring and a first step portion are provided on the outer side wall of the middle part, the diameter of the clamping ring is larger than the diameter of the ventilation limiting fixture, and the first step portion is located below the clamping ring;

[0006] The ventilation slot plate comprises a first clamping ring portion and a supporting portion extending from the first clamping ring portion in a vertical direction thereof, wherein the first clamping ring portion is clamped between the first step portion and the core laminations.

[0007] In some embodiments, the top of the ventilation slot limiting tooling and the top of the supporting portion are simultaneously against the core laminations.

[0008] In some embodiments, the ventilation slot limiting tool further includes a second step portion, the second step portion is located above the clamping ring, and the first step portion and the second step portion are respectively adjacent to the clamping ring.

[0009] In some embodiments,

[0010] A first main body portion extends downward from the first step portion, and a second main body portion extends upward from the second step portion. The first main body portion and the second main body portion are respectively inserted into the core laminations.

[0011] In some embodiments, a ventilation slot sheet is further included, wherein the lower end surface of the ventilation slot sheet abuts against the supporting portion of the ventilation slot plate, and the upper end surface of the ventilation slot sheet fits with the core laminations.

[0012] According to another aspect of the present invention, a limiting process for a limiting tooling for a core ventilation slot of a large permanent magnet direct-drive wind turbine generator is provided.

[0013] If it is a single ventilation slot plate structure: when placing the core punching sheet to the ventilation slot, first place the ventilation slot plate, clamp the first main body part of the ventilation slot limiting tooling in the core slot, the first step bottom plate part of the air slot limiting tooling contacts the core punching sheet, and the side is clamped in the first clamping ring part of the ventilation slot plate, and the core punching sheets are stacked on the supporting part of the ventilation slot plate and the ventilation slot limiting tooling in sequence;

[0014] If it is a ventilation slot plate and ventilation slot sheet structure: after placing the ventilation slot limiter and clamping it on the ventilation slot plate, place the ventilation slot sheet on the ventilation slot plate with the side in contact with the second step of the ventilation slot limiter, stack the core punching sheets on the ventilation slot sheet in sequence, clamp the second main body of the ventilation slot limiter in the core slot,

[0015] After the placement is completed, the next section of core punching stacking begins.

[0016] The beneficial effects are as follows: the present invention replaces manual visual inspection and shaping by means of tooling limit forms, thereby improving the stability of core stacking and improving production quality.

[0017] After the improvement of the present invention, the difficulty of operation for employees is reduced, and there is no need to adjust the ventilation slots, thereby reducing the labor intensity of employees; the ventilation slot plates and ventilation slot sheets can be prevented from protruding from the core surface, rework can be reduced, and the quality of the core laminations and the overall insulation quality can be improved.

[0018] At the same time, the ventilation slot adjustment time is reduced. In the single ventilation slot plate structure, the single-stage adjustment time is about 3 minutes, and the ventilation slot limit tooling placement time is about 2 minutes, saving about 30% of the operation time; in the ventilation slot plate and ventilation slot sheet structure, the single-stage through slot adjustment time is 8 minutes, and the ventilation slot limit tooling placement and adjustment time is about 5 minutes, saving about 37.5% of the operation time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a single ventilation slot plate structure of a large permanent magnet direct-drive wind turbine core ventilation slot limiting tooling according to one embodiment of the present invention;

[0020] Figure 2 It is a schematic structural diagram of a large permanent magnet direct-drive wind turbine core ventilation slot limiting tooling of a ventilation slot plate and ventilation slot sheet structure according to one embodiment of the present invention. DETAILED DESCRIPTION

[0021] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0022] Figure 1 A schematic diagram of a large permanent magnet direct-drive wind turbine core ventilation slot limiting fixture 4 of a single ventilation slot plate 3 structure according to an embodiment of the present invention is shown. Figure 1 As shown, the large permanent magnet direct-drive wind turbine core ventilation slot limiting fixture 4 includes a ventilation slot limiting fixture 4 and a ventilation slot plate 3 .

[0023] The main part of the ventilation slot limiting tool 4 is clamped in the core punching sheet 1. A clamping ring portion 41 and a first step portion 42 are provided on the outer wall of the ventilation slot limiting tool 4. The first step portion 42 is located below the clamping ring portion 41. The first step portion 42 extends downwardly with a first main part 44, and the first main part 44 is clamped in a part of the core punching sheet 1. The diameter of the clamping ring portion 41 is larger than the diameter of the first main part 44. The ventilation slot plate 3 includes a first clamping ring portion 41 and a support portion extending from the first clamping ring portion 41 in a vertical direction thereof. The first clamping ring portion 41 is clamped between the first step portion 42 and the core punching sheet 1. A gap is provided between the support portion and the ventilation slot limiting tool 4 and they are not in contact with each other. The top of the ventilation slot limiting tool 4 and the top of the support portion are simultaneously against another part of the core punching sheet 1.

[0024] Figure 2 The schematic diagram shows another embodiment of the present invention, which is a large permanent magnet direct-drive wind turbine core ventilation slot limiting tool 4 with a single ventilation slot plate 3 and ventilation slot sheet 2 structure. Figure 2 As shown, the large permanent magnet direct-drive wind turbine core ventilation slot limiting fixture 4 of the single ventilation slot plate 3 structure includes the ventilation slot limiting fixture 4, the ventilation slot plate 3 and the ventilation slot sheet 2.

[0025] The main part of the ventilation slot limiting tool 4 is clamped in the core punching sheet 1. A clamping ring portion 41, a first step portion 42 and a second step portion 43 are provided on the outer wall of the ventilation slot limiting tool 4. The first step portion 42 is located below the clamping ring portion 41, and the second step portion 43 is located above the clamping ring. The first step portion 42 and the second step portion 43 are adjacent to the clamping ring respectively. The first step portion 42 extends downwardly with a first main part 44, and the first main part 44 is clamped in a part of the core punching sheet 1. The second step portion 43 extends upwardly with a second main part 45, and the second main part 45 is clamped in another part of the core punching sheet 1. The diameter of the clamping ring portion 41 is greater than the diameter of the first main part 44. The ventilation slot plate 3 includes a first clamping ring portion 41 and a support portion extending from the first clamping ring portion 41 to the vertical direction thereof. The first clamping ring portion 41 is clamped between the first step portion 42 and the core punching sheet 1. A gap is provided between the support portion and the ventilation slot limiting tool 4 and they are not in contact. The lower end surface of the ventilation slot sheet 2 is against the supporting part of the ventilation slot plate 3, and the upper end surface of the ventilation slot sheet 2 is in contact with the core punching sheet 1. The tooth tip of the ventilation slot sheet 2 is stuck at the second step, located between the second step and another part of the core punching sheet 1.

[0026] The present invention replaces manual visual inspection and shaping by using a tooling limiter. After the present invention is improved, the difficulty of operation for employees is reduced, and there is no need to adjust the ventilation slots, which reduces the labor intensity of employees; it can prevent the ventilation slot plate 3 and the ventilation slot sheet 2 from protruding from the core surface, reduce rework, and improve the quality of the core punching sheet 1 and the overall insulation quality. At the same time, the ventilation slot adjustment time is reduced. In the single ventilation slot plate 3 structure, the single-stage adjustment time is about 3 minutes, and the ventilation slot limiter tooling 4 placement time is about 2 minutes, saving about 30% of the operation time; in the ventilation slot plate 3 and ventilation slot sheet 2 structure, the single-stage through slot adjustment time is 8 minutes, and the ventilation slot limiter tooling 4 placement and adjustment time is about 5 minutes, saving about 37.5% of the operation time.

[0027] The installation process of the core ventilation slot limiting fixture 4 of a large permanent magnet direct-drive wind turbine generator is as follows.

[0028] If it is a single ventilation slot plate 3 structure: when placing the core punching sheet 1 to the ventilation slot, first place the ventilation slot plate 3, clamp the first main body part 44 of the ventilation slot limiting tool 4 in the core slot, the first step bottom plate part of the air slot limiting tool 4 contacts the core punching sheet 1, and the side is clamped in the first clamping ring part 41 of the ventilation slot plate 3, and the core punching sheet 1 is stacked on the supporting part of the ventilation slot plate 3 and the ventilation slot limiting tool 4 in sequence;

[0029] If it is a structure of ventilation slot plate 3 and ventilation slot sheet 2: after placing the ventilation slot limiting tool 4 and clamping it with the ventilation slot plate 3, place the ventilation slot sheet 2 on the ventilation slot plate 3, and the side edge contacts the second step of the ventilation slot limiting tool 4, and stack the core punching sheet 1 on the ventilation slot sheet 2 in sequence, clamp the second main part 45 of the ventilation slot limiting tool 4 in the core slot, and after the placement is completed, start stacking the next section of punching sheets.

[0030] During the installation of the ventilation slots, the tooth tip positions of the ventilation slot plate 3 and the ventilation slot sheet 2 are clamped with a limiting fixture, and the number of installations of a single ventilation slot plate 3 is not less than two to limit the movement of the ventilation slot plate 3. The ventilation slot limiting fixture 4 is used to limit the left and right movement of the ventilation slot plate 3 and the ventilation slot sheet 2.

[0031] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents; without departing from the spirit of the technical solution of the present invention, they should all be included in the scope of the technical solution for protection of the present invention.

Claims

1. A limiting method for a limiting tool for a core ventilation slot of a large permanent magnet direct-drive wind turbine generator, characterized in that: A ventilation slot limiting fixture, the main body of which is clamped in the core laminations, a clamping ring and a first step portion are provided on the outer side wall of the middle part, the diameter of the clamping ring is larger than the diameter of the ventilation slot limiting fixture, and the first step portion is located below the clamping ring; The ventilation slot plate comprises a first clamping ring portion and a supporting portion extending from the first clamping ring portion in a vertical direction thereof, wherein the first clamping ring portion is clamped between the first step portion and the core laminations, the top of the ventilation slot limiting fixture and the top of the supporting portion are simultaneously against the core laminations, the ventilation slot limiting fixture further comprises a second step portion, the second step portion is located above the clamping ring, the first step portion and the second step portion are respectively adjacent to the clamping ring, the first step portion extends downwardly with a first main body portion, the second step portion extends upwardly with a second main body portion, the first main body portion and the second main body portion are respectively penetrated in the core laminations, It also includes a ventilation slot sheet, wherein the lower end surface of the ventilation slot sheet abuts against the supporting portion of the ventilation slot plate, and the upper end surface of the ventilation slot sheet fits with the core laminations. The specific limiting method is as follows: If it is a single ventilation slot plate structure: when placing the core punching sheet to the ventilation slot, first place the ventilation slot plate, clamp the first main body part of the ventilation slot limiting tooling in the core slot, the first step bottom plate part of the air slot limiting tooling contacts the core punching sheet, and the side is clamped in the first clamping ring part of the ventilation slot plate, and the core punching sheets are stacked on the supporting part of the ventilation slot plate and the ventilation slot limiting tooling in sequence; If it is a ventilation slot plate and ventilation slot sheet structure: after placing the ventilation slot limiting tooling and clamping it with the ventilation slot plate, place the ventilation slot sheet on the ventilation slot plate, and the side edge contacts the second step of the ventilation slot limiting tooling, stack the core punching sheets on the ventilation slot sheet in sequence, clamp the second main body of the ventilation slot limiting tooling in the core slot, and after the placement is completed, start stacking the next section of core punching sheets.

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