JPH0287951A - Stator - Google Patents

Abstract

PURPOSE:To fix a laminated core and end rings securely by inserting a pair of wedge bars having contact surfaces inclining in opposite directions. CONSTITUTION:A laminated core 1 and end rings 2 are formed into an integral body by a wedge member 3. Said wedge member 3 is composed of a pair of wedge bars 10, 11 and respective wedge bars 10, 11 have slopes 10a, 11a coming into contact with the slope of a dovetail groove 6. Said wedge bars 10, 11 are inserted into the dovetail groove 6 to be formed into an integral body with a trapezoidal section. Further, the opposed surfaces of respective wedge bars 10, 11 form contact surfaces 10b, 11b inclining in opposite directions. Then, said contact surfaces 10b, 11b come into contact with each other by insertion into said dovetail groove 6 to form a wedge member 3. In this case, when a pair of wedge bars 10, 11 are inserted into the dovetail groove 6 from opposite directions, respective wedge bars 10, 11 spread the slope of said groove 6 by the slopes 10a, 11a. This action enables fixing said laminated core and end rings securely by a large force.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a stator of an electric motor or the like used for rotationally driving, for example, a main shaft of a machine tool.

[Conventional technology]

The stator of an electric motor used to drive the spindle of a machine tool has a frame removed to expose its outer surface for purposes such as cooling. For this reason, end rings are provided at both ends of the laminated core for attaching the laminated core, which constitutes the stator, to the bracket.

FIG. 6 shows an analysis diagram of an electric motor using such a stator. The rotating shaft 62 to which the rotor 61 is attached is the bearing 6
3 and is rotatably supported by a bracket 64. A stator 65 is provided outside the rotor 61 with a predetermined gap therebetween.

The stator 65 is attached to the bracket 65 with both ends pressed by end rings 66 made of a thick steel plate.
This is done by screwing the bolt 67 from 4 to the end ring 66. Figures 7 and 8 show this stator 65.
The assembly shows the structure. A laminated iron core 69 is formed by laminating thin steel plates each having a slot 68 formed on the inner peripheral surface by press punching. The end rings 66 are in contact with both ends of the six laminated cores. A key groove is formed on the outer surface of the laminated core 69 and the end ring 66, a key 70 is pushed into the key groove, and welding 71 is performed along both sides of the key 70 in the longitudinal direction, thereby integrating the laminated core 69. Then, the end ring 66 and the laminated core 69 are integrated.

9 and 10 show another conventional example of the stator 65 disclosed in Japanese Patent Application Laid-open No. 58-43150. A dovetail groove 74 is formed on the outer surface of the laminated core 69 and the end rings 66 at both ends of the laminated core 69, and a wedge member 72 having a trapezoidal cross section is inserted into the dovetail groove 74.

The wedge member 72 comes into contact with the slope of the dovetail groove 74 to ensure alignment between the laminated core 69 and the end ring 66. Further, a figure 7 groove is formed between the dovetail groove 74 and the wedge member 72, and by welding 73 along this figure 7 groove, the laminated iron core 69 and endrin 66 are integrated. ing.

[Problem to be solved by the invention]

However, in any of the stators, since welding is performed on the outer surface of the laminated core 69, the internal dimensions of the core change due to thermal effects during welding. Further, welding is performed depending on the number of keys 70 and wedge members 72.
2 requires 6 to 8 welding steps, which increases the number of welding steps. Furthermore, the appearance has deteriorated as the welded parts are directly exposed to the outside surface. In addition, in the conventional examples shown in FIGS. 6 to 8, it is necessary to increase the thickness of the end ring in order to fix the bolt 67, making it difficult to form with a punching press.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a stator in which a laminated core and an Enton ring can be reliably fixed without welding, which may cause problems.

[Means to solve the problem]

In the present invention, a dovetail groove is formed in the laminated core and the end ring, and a wedge member is inserted into the dovetail groove to fix the laminated core and the end ring, but the wedge member is inserted from the opposite direction to the dovetail groove. The wedge rods are formed by a pair of wedge rods, and the contact surfaces of the pair of wedge rods that come into contact with each other when inserted into the dovetail grooves are formed to slope in opposite directions.

(Function) When a pair of wedge bars are inserted into a dovetail groove from opposite directions, each wedge bar acts to push the slopes of the dovetail groove apart due to the abutment of the contact surfaces inclined in opposite directions. and the end ring is fixed with great force.

(Example) Hereinafter, the present invention will be explained in detail with reference to the accompanying drawings.

FIG. 1 shows an embodiment of a stator according to the present invention, in which end rings 2 are provided at both ends of a laminated core 1, and these laminated cores 1 and end rings 2 are integrated by a wedge member 3.

The laminated core 1 has a predetermined length by laminating a plurality of thin steel plates formed by press punching in the thickness direction. As shown in FIG. 4, the laminated core 1 has slots 4 formed on its inner surface for winding, and cooling air holes 5 suitably formed on its outer periphery. Moreover, a plurality (6 to 8) of dovetail grooves 6 are formed on the outer surface. On the other hand, as shown in FIG. 5, the end ring 2 has an inner diameter hole 7 formed by press punching, and an air hole 5.
A dovetail groove 6 having the same shape and size as the dovetail groove 6 of the laminated core 1 is formed on the outer surface. By stacking these laminated cores 1 and end rings 2, the dovetail grooves 6 communicate in the stacking direction.

The wedge member 3 is inserted into such a dovetail groove 6. As shown in FIG. 2, the wedge member 3 consists of a pair of wedge rods 10, 11, each of which has slopes 10a, 11a that contact the slopes of the dovetail groove 6. The wedge rods 10 and 11 are inserted into the dovetail groove 6 and integrated into a wedge member 3 having a trapezoidal cross section. As shown in FIG. 3(b), each of the wedge bars 10, 11 has contact surfaces 10b, 11b whose opposing surfaces are inclined in opposite directions, and when inserted into the dovetail groove 6, As in a), the contact surfaces 10b, l
lb come into contact with each other to form a wedge member 3.

Next, a method for assembling such a stator will be explained.

End rings 2 are superimposed on both ends of the laminated core 1, and these dovetail grooves 6 are made to communicate with each other. Next, the wedge member 3 is inserted into the dovetail groove 6, and as shown in FIG. Insert the slide into 6. This wedge rod 10,
Step 11 is performed by applying a striking force such as driving or a pressing force such as pressing. By inserting from opposite directions, the wedge rods 10 and 11 are brought into contact with their contact surfaces 10b.

11b are in contact with each other. In this case, the contact surfaces 10b, 1
．． Since 1b is inclined in the opposite direction, the respective slopes 10a of the wedge bars 10 and 11 are brought into contact with each other.

11a acts to spread the dovetail groove 6.

This is shown in Fig. 2 (b) and (c). When the wedge rod is driven in with pressure P2, it is divided into a component force R1 to the contact surface and a component force R2 to the slope. It acts to spread out. Then, this pushing and spreading force R2
As a result, the laminated core 1 and the end ring 2 are firmly fixed and integrated. Therefore, since there is no need to weld and integrate the laminated core 1 and the end ring 2, problems caused by welding such as thermal deformation, increase in the number of steps, and appearance deterioration do not occur at all.

Note that the contact surface 10b performs such an action.

By appropriately changing the inclination angle of 11b, the fixing force of the laminated core and the end ring can be adjusted.

〔Effect of the invention〕

As explained above, the present invention enables strong integration of the laminated core and end ring by inserting a pair of wedge bars with contact surfaces inclined in opposite directions, and eliminates the need for welding for integration. This eliminates thermal deformation, increased number of steps, and appearance deterioration caused by welding.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of the present invention, Fig. 2 is a perspective view showing a method for attaching a wedge bar, Fig. 3 is a perspective view showing a wedge bar and a diagram showing component forces, and Fig. 4 is a perspective view showing a method of attaching a wedge bar. Figure 5 is a front view showing the laminated core, Figure 5 is a front view showing the end ring, Figure 6 is a sectional view of a motor using a conventional stator, and Figures 7 and 8 are front views showing the stator. 9 and 10 are a perspective view and a sectional view showing another conventional stator. DESCRIPTION OF SYMBOLS 1... Laminated iron core, 2... End ring, 3... Wedge member, 4... Slot, 5... Air hole, 6... Dovetail groove, 7... Inner diameter hole, 10.11 -... wedge bar, 10a,
1la-... slope, 10b, llb... contact surface. 1a layer scissors ε near

Claims (1)

[Scope of Claims] A dovetail groove formed on the outer peripheral surface of a laminated core and end rings provided at both ends of the laminated core so as to communicate in the lamination direction, and a wedge member inserted into the dovetail groove. The wedge member includes a pair of wedge rods having abutting surfaces that are inclined in opposite directions and come into contact with each other when inserted into the dovetail groove, and the wedge rod is inserted into the dovetail groove from the opposite direction. A stator characterized by being inserted.