Installation method of form-wound coil or tooth-wound coil

Abstract

The invention relates to a method for mounting prefabricated form-wound coils or tooth-wound coils (16) on a laminated core to form a stator segment (5) or a stator, which is carried out by the following steps: - producing a form-wound coil or tooth-wound coil (16) with an insulation portion; - using a pressure plate (1) with pressure fingers (2), punching and stacking laminate sheets to form a partial laminated core (12) and / or a laminated core, which are spaced apart from each other by spacers and have open slots (6) extending substantially axially; - radially inserting the form-wound coil or tooth-wound coil (16) into the slots (6), said slots containing one or more teeth (3) of the laminated core, wherein removable auxiliary elements (7) for protecting the insulation portion of the form-wound coil or tooth-wound coil (16) during the radial insertion are present at least at the end faces of the tooth or teeth of the laminated core; - radially removing the auxiliary elements (7) and repositioning the auxiliary elements (7) on other teeth (3).

Description

Technical Field

[0001] The present invention relates to a method for mounting form-wound coils or tooth-wound coils in slots of a laminated core of a dynamoelectric machine, and an auxiliary element for mounting these coils in a laminated core. Background Art

[0002] The stator or stator portion of a motor generator has coils in a layered laminated core to drive a working machine or generate electrical energy by a driven rotor through electromagnetic interaction with the rotor.

[0003] In particular, in dynamoelectric machines with larger power ratings (greater than 1 MW), the introduction of these form-wound or tooth-wound coils is problematic because a relatively high copper filling factor is required in the slots, and furthermore, insulation must be provided around the form-wound or tooth-wound coils. Consequently, the introduction of the coils through the slots is complicated. Introducing the winding system, i.e., the form-wound or tooth-wound coils, into the slots can lead to damage to the insulation of the form-wound or tooth-wound coils due to contact with the edges of the teeth of the laminated core.

[0004] It is known to insert slot liners as a sliding aid and for protecting the insulation. However, such slot liners can only provide insufficient protection against insulation damage when form-wound coils and tooth-wound coils are introduced into the slots. Summary of the Invention

[0005] Against this background, the object of the present invention is to provide a method for introducing a form-wound coil or a tooth-wound coil into a slot of a stator or a stator segment, which method prevents damage to the insulation of the form-wound coil or the tooth-wound coil by the teeth of the laminated core during the introduction of the form-wound coil or the tooth-wound coil.

[0006] The above objects are achieved by a method of mounting a preformed mold-wound coil or a tooth-wound coil on a layered laminated core to form a stator segment or a stator, which is performed by means of the following steps:

[0007] Produce form-wound coils or tooth-wound coils with insulation,

[0008] punching and stacking the laminate sheets by means of a pressure plate having pressure fingers to form partial laminated cores and / or laminated cores, which are separated from one another by spacers and have substantially axially extending open slots,

[0009] radially inserting the form-wound coil or tooth-wound coil into slots containing one or more teeth of the laminated core, wherein at least at the end faces of the teeth of the laminated core there are removable auxiliary elements which protect the insulation of the form-wound coil or tooth-wound coil during said radial insertion,

[0010] • Radially remove the auxiliary element and reposition it on another tooth.

[0011] The object is also achieved by an auxiliary element which facilitates the installation of a form-wound coil or a tooth-wound coil in a slot of a laminated core, wherein the auxiliary element has in particular a basic structure similar to an isosceles triangle with mutually facing bent legs.

[0012] The method according to the invention now provides auxiliary elements at least at each of the end faces of the laminated core. These auxiliary elements ensure that the form-wound coils or tooth-wound coils are guided into the slots of the laminated core during radial installation. This prevents, in particular, damage to the insulation due to the edges of the teeth.

[0013] Form-wound coils or tooth-wound coils are open or closed coils that have a solid insulated conductor or individual, mutually insulated partial conductors. These mutually insulated partial conductors are usually surrounded by a main insulation. The main insulation is particularly present in the slot area of ​​the dynamoelectric machine.

[0014] If the laminated core is provided with pressure plates with pressure fingers at the end faces, the auxiliary elements are preferably placed on the pressure fingers, thereby also preventing the sharp edges of the teeth in the end face region of the laminated core from coming into contact with the insulation of the form-wound or tooth-wound coils. The width of the pressure fingers is smaller than the width of the teeth, so that the auxiliary elements ensure guidance of the coils during installation without reducing the width of the slots.

[0015] Viewed in the axial direction, such a laminated core can also be composed of partial laminated cores, which are each separated from one another by spacers.

[0016] To prevent the insulation of the form-wound or tooth-wound coil from coming into contact with the sharp-edged teeth of the laminated core or partially laminated cores, these auxiliary elements should be placed not only at the end faces but also, for example, on spacers between the partially laminated cores. This reduces contact with the insulation and the sharp-edged teeth.

[0017] According to the invention, the auxiliary element is designed in the form of a triangle, with both legs of the triangle having a bend. This bend ensures guidance of the form-wound or tooth-wound coil in the area of ​​the teeth during assembly. In this case, the legs of the triangle can also be designed in a curved manner.

[0018] To secure the auxiliary element, the two legs of the isosceles triangle extend beyond the hypotenuse of the triangle, so that the pressure finger, laminate or spacer can be secured via these extended legs. This securing can be improved by snap-in elements on the extended legs.

[0019] Other shapes of auxiliary elements are also possible which ensure a damage-free installation of the coil in the slots of the laminated core. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The invention and further advantageous configurations of the invention are explained in more detail by means of schematically illustrated exemplary embodiments; in the drawings:

[0021] Figure 1 shows a perspective view of a stator segment,

[0022] Figure 2 shows a partially laminated core,

[0023] Figure 3 shows the auxiliary elements on the teeth,

[0024] Figure 4 shows the basic installation operations,

[0025] Figure 5 shows the placement of tooth wound coils in slots of a laminated core,

[0026] Figure 6 A schematically illustrated wind turbine is shown. DETAILED DESCRIPTION

[0027] Figure 1 A perspective view of a stator segment 5 is shown with tooth-wound coils 16 in slots 6. The laminated core 26 is subdivided into partial laminated cores 12, which are spaced apart from one another by spacers 8.

[0028] Figure 2 The partial laminated core 12 is shown at the axial end of the laminated core 26, wherein the partial laminated core 12 has a pressure plate 1 with pressure fingers 2 for compressing the laminated core 26. Arranged on the pressure fingers 2 is an auxiliary element 7, which is Figure 3 Shown in more detail in .

[0029] The auxiliary element 7 has a substantially triangular shape, wherein the triangle has two identical legs 15, each leg 15 having a bend 18 at the top. The bend 18 makes it easier to guide the form-wound coil or tooth-wound coil 16 onto the tooth 3 or into the slot 6.

[0030] The auxiliary element 7 should have good sliding ability, especially above the bend 18, to avoid the coil from tilting during installation. The auxiliary element 7 is made of a slidable material, such as glass reinforced laminate or PTFE or some other hard plastic. It can also be made of metal, especially steel.

[0031] Optionally, a coating, such as a sliding film, can be provided on the upper portion of the leg side 15, which further improves the sliding ability. The coating can be replaced when worn.

[0032] The snap-in element 27 can improve the temporary fixing of the auxiliary element 7 on the tooth 3 or the pressure finger 2 .

[0033] The tooth width 4, in particular in the area of ​​the tooth head 13, is the same as or slightly smaller than the width 10 of the auxiliary element 7 in this area (approximately 0 to 3 mm, depending on the size of the arrangement). This prevents the insulation from coming into contact with the edge of the tooth head 13 during installation.

[0034] In other words, the width 10 of the auxiliary element 7 is therefore the same as or slightly greater than the tooth width 4. In order to enable improved removal after mounting of the auxiliary element 7, an eyelet 11 is provided in the upper region of the auxiliary element 7.

[0035] Figure 4 The basic installation process is shown, wherein the tooth wound coil 16 is placed in the slot 6. The auxiliary element 7 having a width 10 is positioned on the pressure finger 2 and thus prevents the insulation of the coil 16 from coming into contact with the edge of the laminated core 26 or the partial laminated core 12.

[0036] Once a tooth-wound coil 16 has been installed, Figure 5 , the auxiliary element 7 is removed by means of the cutout 11 , in particular the eyelet, and placed on an adjacent or another pressure finger 2 , thus repeating the process of radially introducing the coil 16 .

[0037] For each coil, at least two auxiliary elements 7 are required, which are respectively arranged on the end faces of the laminated core 26 for the mounting process.

[0038] Therefore, now according to Figure 6 The generator 21 of the wind turbine 20 is provided with an air-cooled stator or a stator segment 5 or a plurality of stator segments 5 , wherein cooling air 23 is guided through the gaps between the partial laminated cores 12 of the laminated core 26 for cooling the stator.

Claims

1. A method for mounting a preformed mold-wound coil or tooth-wound coil (16) on a layered laminated core to form a stator segment (5) or a stator, which is performed by the following steps: - producing a form-wound coil or tooth-wound coil (16) with insulation, - punching and stacking laminate sheets by means of a pressure plate (1) with pressure fingers (2) to form partial laminated cores (12) and / or laminated cores, said partial laminated cores (12) and / or laminated cores being spaced apart from one another by spacers, with slots (6) extending substantially axially and being open, - radially inserting the form-wound coil or tooth-wound coil (16) into the slot (6), the slot (6) comprising one or more teeth (3) of the laminated core, wherein, At least at the tooth end faces of the laminated core there are removable auxiliary elements (7), which protect the insulation of the form-wound coil or tooth-wound coil (16) during radial insertion, - radially removing said auxiliary element (7) and repositioning said auxiliary element (7) on another tooth (3), The auxiliary element is positioned on the pressure finger (2).

2. The installation method according to claim 1, wherein: The auxiliary elements (7) are additionally arranged on the first laminate and the last laminate of the laminated core (26), respectively.

3. The installation method according to any one of the preceding claims, characterized in that The auxiliary element (7) is additionally arranged on the spacers (8) between the partial laminated cores (12) of the laminated core (26).

4. An auxiliary element (7) for facilitating the installation of a form-wound coil or tooth-wound coil (16) in a slot (6) of a laminated core (26), wherein the laminated core is provided with pressure plates having pressure fingers at the end faces, and wherein The auxiliary element (7) is arranged on the end face of the laminated core (26) and is positioned on the pressure finger (2) for mounting.

5. Auxiliary element (7) according to claim 4, characterized in that The auxiliary element (7) has a basic structure similar to an isosceles triangle with bent legs facing each other.

6. Auxiliary element (7) according to claim 4 or 5, characterized in that The auxiliary element (7) has an eyelet in its upper part and / or a releasable snap-on element (27) in the extension of the legs of the auxiliary element (7).

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