JPH0154946B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotating electric machine equipped with a wedge coupling body for preventing a coil housed in a slot of a stator core from coming off from an opening of the slot.

Figures 1 and 2 show conventional examples of small electric motors using this type of wedge. In the figures, 1 is the rotating shaft;
2 is a rotor core supported by a rotating shaft; 3 is a stator core that faces the outer periphery of the rotor core 2 through a gap; 4 is a plurality of slots formed in the stator core 3; 5 is a slot. 6 is a slot insulating paper that insulates between the stator core 3 and the coil 5 in the slot 4, and 7 is a slot insulating paper that prevents the coil 5 accommodated in the slot 4 from coming off from the opening 4a of the slot 4. The wedges 8 and 9 are tightening screws and nuts that connect the load side and anti-load side brackets 8 and 9, which are supported by the rotating shaft 1 via a bearing 10 and support the stator core 3 on the inner periphery. .

With the above structure, in the conventional wedge 7, the wedge 7 is manufactured by cutting an insulating film such as a polyester film and then molding it into a predetermined shape, which increases the material cost, and also requires manual insertion of the coil into the slot 4. When carrying out the loading process, a large amount of working time is required and productivity is low. Furthermore, in order to increase productivity, when mechanizing a coil inserter equipped with a wedge pusher, it is often equipped with a cutting and forming machine to cut and form the insulating film, and the production capacity of the cutting and forming machine is generally limited. Since it is inferior to the production capacity of coil inserters, it has the drawback of lowering the operating rate of expensive coil inserters with complicated configurations. Furthermore, since the wedge 7 is formed from a thin insulating film, when the coil 5 and the wedge 7 are inserted into the slot 4, the wedge 7 may be deformed or moved due to an imbalance in insertion resistance, causing the coil housed in the slot 4 to 5 may come into contact with the stator core 2 and cause insulation failure.
When binding the coil ends 5a and 5b with insulating thread, the binding force is too strong and the coil ends 5a and 5b may deform and come into contact with the rotor 2 or the bearing 10. To prevent this, the coil ends 5a and 5b are There were drawbacks that resulted in a decrease in productivity, such as inserting a jig inside and performing extra shaping work on the coil ends 5a and 5b.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and by constructing a molded article made of synthetic resin in which a plurality of wedges are connected, the wedges can be inserted into a plurality of slots at the same time. The purpose of the present invention is to provide a rotating electric machine with excellent productivity that enables the following.

An embodiment of the present invention will be described below with reference to FIGS. 3 to 5. In the figure, the same reference numerals as in FIGS. 1 and 2 indicate the same or corresponding parts, and 13 is a wedge assembly formed by connecting a plurality of wedges, 13a to 1
3d is a part constituting the wedge joint 13, 13a is a wedge inserted into the slot 4, 13b is an inner ring that connects one end of the wedge 13a via an arm 13c, and 13d is an outer ring that connects the other end of the wedge 13a. With a ring, the load side coil end 8b is attached to the arm 13c.
The wedge _13a is longer than the laminated thickness of the stator core 3, is equal to or slightly longer than the slot insulating paper 6, and has a wedge at the load side end to facilitate insertion into the slot 4. Inclined surface 13a ₁
is formed. The outer diameter of the inner ring 13b is smaller than the inner diameter of the stator core 1, and the width of the tip of the arm 13c is slightly narrower than the opening 4a of the slot 4. Further, the inner diameter of the outer ring 13d is larger than the outer diameter of the rotor 2, and the outer diameter of the outer ring 13d is dimensioned so as not to come into contact with the slot insulating paper in the slot 4. Further, the dimensions are set so that when the wedge 13a is inserted into the slot 4, the position P of the end of the outer ring 13d is located outside the end of the counter-load side coil end 8a. As described above, the dimensions of each part of the wedge assembly 13 are set corresponding to the dimensions of each part of the stator core 3 and the laminated thickness, and are made of glass fiber-reinforced polybutyl terephthalate resin or glass fiber-reinforced nylon resin. Prepare a molded product by injection molding with resin or the like to have appropriate strength, elasticity, and insulation properties.

When the coils are inserted manually with the above structure, the coils 5 are inserted into each slot 4, and then guided to the inner circumference of the stator core 3, with the inner ring 13b first, through a plurality of wedges. 13a can be inserted into each slot 4 from the axial direction on the anti-load side at the same time, and the wedge insertion time can be shortened. In addition, when using a coil inserter equipped with a wedge pusher, a guide blade (not shown) is required.
A plurality of coil ends 5b are hooked onto the slot 4 so as to be inserted into the slot 4 at a predetermined coil pitch, and the wedge coupling body 13 is arranged so that the inner ring 13b is on the top and the outer ring 13d is on the bottom. An insertion head (not shown) allows each coil 5
By pushing up, each coil 5 is simultaneously inserted into the slot 4 guided by the guide blade. At the same time as this operation, a wedge pusher (not shown) pushes up the wedge 13a, and the plurality of wedges 13a
is guided by a wedge guide (not shown) into slot 4.
are inserted simultaneously within.

As described above, in the case of mechanization using a coil inserter, the wedge assembly 13 made by joining a plurality of wedges 13a is used instead of using a wedge cutting and forming machine, so the operating rate of the coil inserter is improved. can be done. Furthermore, since the wedge assembly 13 is made of a molded insulator with appropriate strength and elasticity, when the wedge 13a is inserted into the slot 4, the wedge 13a does not deform or move.
Therefore, the coil 5 does not come into contact with the stator core 3, thereby preventing insulation failure from occurring. Also, coil end 5
Even if excessive force is applied to a and 5b, the wedge joint 13
It is blocked by the arm 13c and the outer ring 13d, and does not come into contact with rotating parts or stationary parts such as the bearing 10.

FIGS. 6 and 7 show other embodiments, and show a wedge assembly 13 suitable for manual coil insertion. In the drawings, the same reference numerals as in Figs. 3 to 5 indicate the same or equivalent parts, and when inserting the coil manually, one of the coil ends should be connected to the load side coil end 5a shown in Fig. 5. The inner diameters of the ends are not made small, and the inner diameters of the coil ends 5a and 5b are both larger than the outer diameter of the rotor core 2, as shown in FIG.
Therefore, there is no need to reduce the outer diameter of the inner ring 13b as shown in FIG.
It is sufficient to make it slightly smaller than the inner diameter of.

As described above, according to the present invention, a plurality of wedges are connected to each other and are made of a synthetic resin molded product with appropriate strength and elasticity, so it is possible to insert a plurality of wedges into a slot at the same time. Therefore, it is possible to provide a rotating electric machine with excellent productivity.

[Brief explanation of drawings]

Figures 1 and 2 show a conventional example. Figure 1 shows the configuration of a rotating electric machine, a vertical sectional view with a partially cutaway front view, and Figure 2 shows the configuration inside the slot. An enlarged sectional view, FIGS. 3 to 5 show a wedge joint according to an embodiment of the present invention, and FIG. 3 is a plan view showing a portion A indicated by diagonal lines in the - cross section of FIG. 4.
Fig. 4 is a plan view showing the shaded part B as a - cross section in Fig. 3, Fig. 5 is a vertical sectional view with a part cut away and a front view, and Figs. 6 and 7 are 6 is a plan view showing a hatched portion C as a cross section in FIG. 7, and FIG. 7 is a plan view showing a hatched portion D as a cross section in FIG. 6. . In the figures, the same reference numerals indicate the same or equivalent parts, 2 is the rotor core, 3 is the stator core, 4 is the slot, 4a is the opening, 5 is the coil, 13 is the wedge assembly, 13a is the wedge, and 13b is the Inner ring, 13d
is the outer ring.

Claims (1)

[Claims] 1 The coil 5 accommodated in the slot 4 having the narrow opening 4a of the stator core 3 is inserted into the slot 4.
In a rotating electrical machine equipped with a wedge coupling body for preventing the wedge coupling body from separating from the opening 4a of the stator core 3, the wedge coupling body is inserted into the slot 4 in the axial direction from the non-load side side of the stator core 3. The plurality of wedges 13a are
At the load side side portion of the stator core 3, the wedge 13
The end of the a side is connected to an inner ring 13b having an outer diameter smaller than the inner diameter of the stator core 3 via an arm 13c formed narrower than the opening 4a of the slot 4, and is connected to the anti-load side of the stator core 3. At the side part, the inner diameter is larger than the outer diameter of the rotor core 2, and the outer diameter is smaller than the inner diameter of the stator coil end 5a,
A rotating electric machine characterized in that the opposite end of the load side is connected by an outer ring 13d formed such that the end thereof is axially outer than the end of the coil end 5a of the stator.