JP2003259609A - Assembling method for rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To retain a stator into a cylindrical shape without causing distortion in shrink-fitting the stator formed by combining a plurality of iron pieces into a cylindrical shape on a frame. <P>SOLUTION: In the stator 1 formed into a cylindrical shape by combining an iron core piece 2 wound with a winding 5 through an insulating frame 4, jigs 7 and 8 of cylindrical pan shapes are covered tightly on both ends of the stator 1 using the elasticity of the insulating frame 4. While being retained into a cylindrical shape, the stator 1 is shrinkage-fitted and the jigs 7, 8 are removed. The correction of welding distortion for the stator 1, which has been necessary for a conventional method of retaining the cylindrical shape of the stator 1 by welding a section between outer peripheries of iron core pieces, can be eliminated, thus reducing man-hours for assembly and preventing an electrical characteristic from being degraded due to the welding distortion. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of assembling a rotary electric machine having a split type stator in which a plurality of iron core pieces are combined in a cylindrical shape, and more specifically, to a cylindrical shape before the stator is inserted into a frame. Regarding the method.

[0002]

2. Description of the Related Art FIG. 5 is a perspective view of a stator and a frame of an electric motor showing a conventional method. The split type stator 1 includes a required number of arc-shaped iron core pieces 2 around which windings are wound, which are combined in a cylindrical shape as shown in the drawing, and after connection is performed, a frame made of aluminum or the like (stator Shrink fit to frame 3 in the direction of the arrow. In that case, in order to prevent the iron core pieces 2 combined in a cylindrical shape from being separated from each other when the iron core pieces 2 are inserted into the frame 3, conventionally, in the outer peripheral portion of the stator 1, there are 1 to 3 points P in the axial direction.
The work of connecting the core pieces to each other by electric welding is performed.

[0003]

However, the conventional method of maintaining the cylindrical shape by welding has the following problems. The cylindrical shape of the stator is deformed into an elliptical shape due to the thermal strain caused by welding, which makes it difficult to insert it in the shrink fit to the frame in the subsequent process, and it is necessary to partially correct the outer peripheral surface with a grinder. become. Due to the above-mentioned thermal strain, the slot pitch of the stator is disturbed, the cogging torque increases, and the electrical performance is affected. If oil adheres to the iron core piece during welding, the welding will be disturbed, the weld meat will stick out on the outer peripheral surface of the stator, and it will be necessary to smooth it with a grinder or the like. An object of the present invention is to eliminate the above problems associated with welding of a split type stator, reduce the number of assembly steps, and improve the electrical performance.

[0004]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention is of a split type in which a plurality of iron core pieces each having a winding wound through an insulating frame are combined in a cylindrical shape. In a method of assembling a rotary electric machine having a stator, after combining the iron core pieces into a cylindrical shape, a jig is fitted to the insulating frames at both ends of the iron core piece to hold the cylindrical shape, and then the stator is attached to a frame. After the shrink fitting, the jig is removed (Claim 1). The present invention utilizes elasticity of an insulating frame applied to each iron core piece for winding, and instead of welding, jigs are fitted to both ends of the stator to maintain the cylindrical shape of the stator. . This eliminates the need for welding the iron core pieces and solves the above problems associated with this welding. In that case, it is preferable that the iron core pieces combined in a cylindrical shape are temporarily fixed with a mechanical band, then the jig is fitted, and then the mechanical band is removed and shrink fitted to the frame. The cylindrical shape is held securely until the tool is attached.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention in the same electric motor as shown as a conventional example will be described below with reference to FIGS. The same reference numerals are used for the parts corresponding to those of the conventional example. First, FIG. 2 is a process diagram showing the outline of the assembly procedure of the stator. In FIG. 2, after inserting the upper and lower insulating frames 4 into the iron core piece 2, the winding 5 is wound, and then a plurality of these are combined to form a cylindrical shape. Adjacent iron core pieces 2 have mutual protrusions 2a.
And the recess 2b are engaged with each other. And mechanical band 6
Is temporarily fixed by using, and the windings 5 are connected in that state.

Next, the jigs 7 and 8 are tightly fitted to the flange 4a of the insulating frame 4 protruding from both ends of the iron core piece 2 by utilizing the elasticity of the flange 4a, and the cylindrical shape of the stator 1 is maintained. To do. Then, the mechanical band 6 is removed, the heated frame 3 is placed on the shrink fit base 9, and the stator 1
Insert. When the frame 3 has cooled and tightened, the jigs 7 and 8 are removed, and the shrink fit is completed. The mechanical band 6
Is a metal band 6a with a ratchet screw 6 at one end
It is a known one that is tightened by meshing b with the tooth row 6c at the other end.

FIG. 1 shows a stator 1 held by jigs 7 and 8.
3 is a vertical cross-sectional view showing a state in which the frame is inserted into the frame 3.
Shows jigs 7 and 8, respectively, (A) is a front view,
(B) is a longitudinal sectional view. As shown in FIG. 3, the jig 7 has a shallow cylindrical dish shape made of steel, and is fitted to the flange 4a (FIG. 2) of the insulating frame 4 via the side wall 7a to constrain the stator 1 in a cylindrical shape. The bottom wall of the jig 7 is punched out in a circular shape at the center, and a lead hole 7b for drawing out the lead wire 10 (FIG. 2) from the winding wire 5 is provided on the outside thereof.
A pair of tool holes 7c are provided for hanging a tool when the tool is removed from the tool hole. The jig 8 shown in FIG. 4 also has the same structure, and is different from the jig 7 only in that the height thereof is slightly lower than that of the jig 7 and there is no hole corresponding to the lead hole 7b.

In FIG. 1, the frame 3 is placed on the lower stage of a stepped disk-shaped shrink-fitting base 9, and the stator 1 inserted into the frame 3 is fitted with a jig 8 through a shrink-fitting base 9. Supported by the upper tier. As a result, the axial position of the stator 1 with respect to the frame 3 is accurately determined. Further, the stator 1 is fitted to the inner peripheral surface of the frame 3 on the outer peripheral surface of the iron core piece 2, but the outer peripheral surfaces of the jigs 7 and 8 are lower than the outer peripheral surface of the iron core piece 2 and There is a gap between the peripheral surface. Therefore, after the frame 3 is tightened, the jigs 7 and 8 can be easily removed by pulling the jigs 7 and 8 into the tool holes 7c and 8c. Although the example of the electric motor is shown in the illustrated embodiment,
The present invention can be directly applied to other rotating electric machines having a split type stator such as a generator.

The illustrated embodiment has the following effects. (1) Since the welding is abolished by using the jigs 7 and 8 as a means for holding the cylindrical shape of the stator 1 in which the iron core pieces 2 are combined, the distortion of the stator 1 due to the welding is eliminated, and the outer peripheral surface of the iron core piece 2 is eliminated. The stator 1 can be smoothly inserted into the frame 3 without any modification by a grinder or the like. (2) There is no adverse effect on electrical performance such as an increase in cogging torque due to slot pitch disturbance due to welding distortion. (3) There is no need for correction work such as a grinder that sticks out the weld meat. (4) When the iron core pieces 2 are assembled into a cylindrical shape, the mechanical band 6
Since it is temporarily fixed by, the cylindrical shape does not collapse until the jigs 7 and 8 are fitted.

[0010]

As described above, according to the present invention, when the stator is shrink-fitted to the frame, the jig retains the cylindrical shape of the stator, thereby eliminating welding work which is originally unnecessary for the product. In addition, the work of reworking after welding is not required, the stator is not deformed due to welding distortion, the assembly work time of the rotating electric machine is significantly shortened, and the deterioration of electrical performance such as an increase in cogging torque is prevented. To be done.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a stator according to an embodiment of the present invention in a frame shrink-fitting state.

FIG. 2 is a process drawing showing a procedure of inserting the stator shown in FIG. 1 into a frame.

3A and 3B show one jig in FIG. 1, in which FIG. 3A is a front view and FIG. 3B is a vertical sectional view.

4A and 4B show the other jig in FIG. 1, in which FIG. 4A is a front view and FIG. 4B is a vertical sectional view.

FIG. 5 is an exploded perspective view of a stator and a frame showing a conventional method.

[Explanation of symbols]

1 stator 2 iron core pieces 3 frames 4 insulation frame 5 windings 6 mechanical bands 7 jig 8 jigs 9 base 10 lead wire

Claims (2)

[Claims] 1. A method of assembling a rotary electric machine having a split type stator, wherein a plurality of iron core pieces each having a winding wound through an insulating frame are combined in a cylindrical shape. After being assembled into a shape, a jig is fitted to the insulating frames at both ends thereof to hold a cylindrical shape, and then the stator is shrink-fitted to the frame, and then the jig is removed. Assembling method of rotating electric machine. 2. The iron core pieces combined in a cylindrical shape are temporarily fixed with a mechanical band, then the jig is fitted, and then the mechanical band is removed and shrink fitted to the frame. The method for assembling the rotating electric machine according to claim 1.