JPS624940B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a method for manufacturing a stator of a rotating electric machine in which a stator core and a winding wire wound around the stator core are molded with plastic. a first mold having a central mold whose side is made slightly smaller in diameter than the proximal end side and a stepped portion is formed, and a base end side of the central mold that corresponds to the central mold of the first mold The inner diameter of the plastic layer is fixed so that the inner surface of the plastic layer has a step with respect to the inner surface of the stator core. By forming the plastic layer so that the inner diameter is larger than the inner diameter of the child core, plastic burrs are less likely to form on the inner surface of the stator core when molding the stator core and windings with plastic. To provide a method for manufacturing a stator of a rotating electric machine, which allows temporary burrs to be easily removed even if they occur, and prevents the rotor from being locked by the burrs.

An embodiment in which the present invention is applied to an electric motor will be described below with reference to the drawings.

Reference numeral 1 designates a stator, in which a winding 3 is wound around a stator core 2 formed by laminating a large number of silicon steel plates, and the stator core 2 and winding 3 are wrapped around a plastic layer 4.
Fitting recesses 5 and 6 are formed at both ends of the plastic layer 4, respectively, and a flange 7 having a plurality of attachment holes 7a is formed at the outer periphery. In this case, the inner hole 9 of the plastic layer 4 is connected to the inner surface of the inner hole 8 of the stator core 2.
The inner diameter of the inner hole 9 is set to be larger than the inner diameter of the inner hole 8 so that the inner surface thereof has a step 10. Reference numeral 11 denotes a rotor, which has a rotor core 12 formed by laminating a large number of silicon steel plates and a large number of conductors 13.
Both ends of the conductor 13 are short-circuited by short-circuit rings 14, 14, and a rotating shaft 15 is press-fitted and fixed in the center of the rotor core 12. There is. The rotor 11 is arranged such that the rotor core 12 is located in the inner hole 8 of the stator core 2, and the right end of the rotating shaft 15 is fitted into the fitting recess 5 of the plastic layer 4. The rotary shaft 15 is supported by a bearing 17 of a bearing bracket 16 disposed therein, and the left end of the rotating shaft 15 is inserted through and supported by a bearing 19 of a bearing bracket 18 fitted into the fitting recess 6 of the plastic layer 4 so as to extend outward. It is prominent.

Now, the case of molding the stator 1 will be described with reference to FIGS. 3 and 4. Reference numeral 20 denotes a mold, which includes a lower mold 21 as a first mold and an upper mold 2 as a second mold.
It consists of 2. A molding recess 23 is formed in this lower mold 21, and this molding recess 2
A cylindrical center mold 24 is fixed to the center of the bottom of 3 so as to protrude upward.
A flange 25 for forming the fitting recess 6 is formed on the protruding base of the center mold 24, and the upper half of the center mold 24 is made slightly smaller in diameter than the lower half of the base. A stepped portion 26 is formed. Furthermore, an annular recess 27 for molding the flange 7 is formed at the periphery of the upper surface opening of the molding recess 23 in the lower mold 21.
7 is provided with a protrusion 28 protruding from it for forming the attachment hole 7a. Reference numerals 29 and 29 designate release rods inserted into the bottom of the lower mold 21 so as to be retractable into and out of the molding recess 23 . Further, the upper mold 22 is formed with a molding recess 30 that opens downward for molding the plastic layer 4 in cooperation with the molding recess 23, and a molding recess 30 is formed in the upper center of the molding recess 30. Corresponding to the central mold 24 and the central mold 24
A cylindrical central mold 31 having a diameter equal to the lower half of
is fixed so as to protrude downward, and its central mold 3
A flange 32 for forming the fitting recess 5 is formed on the protruding base 1 . When the lower surface of the upper mold 22 and the center mold 31 are brought into contact with the upper surface of the lower mold 21 and the upper surface of the center mold 24, an injection port 33 communicating with the annular recess 27 is formed between them. It's summery. When the stator core 2 with the winding 3 wound thereon is fitted into the upper half of the center mold 24 in the lower mold 21 and its lower end surface is placed on the stepped portion 26, the stator core 2 is The upper end surface is set to be located slightly below the upper end surface of the center die 24. Then, the upper mold 22 and the center mold 31 are placed on the upper surfaces of the lower mold 21 and the center mold 24.
The lower surfaces of the stator core 2 and the windings 3 are injected into the stator core 2 and the windings 3 by injecting a plastic liquid containing, for example, an unsaturated polyester resin mixed with a filler such as calcium carbonate and glass fiber, and a shrinking agent.
The plastic layer 4 is then molded. In this way, when the stator 1 is taken out from the lower mold 21 and the upper mold 22 after the stator 1 is molded, when the upper mold 22 is moved upward, the stator 1 is removed from the lower mold. Type 21
Then, when the release rod 29 in the lower mold 21 is moved upward and presses the lower surface of the stator 1 upward, the stator 1 is moved upward and the lower part The mold is released from the mold 21. By the way, when the stator 1 is molded using the lower mold 21 and the upper mold 22, as shown in FIG. When the plastic layer 4 is molded by entering the joint portion, burrs 4a are formed on the inner surface of the inner hole 8 of the stator core 2.
may occur. In such a case, after removing the stator 1 from the lower mold 21, the inner surface of the inner hole 8 of the stator core 2 is cut to remove the burr 4.
In this case, the plastic layer 4 is removed from the inner surface of the inner hole 8 of the stator core 2.
Since the inner surface of the inner hole 9 has the step 10, the inner surface of the inner hole 8 can be easily cut without being obstructed by the inner surface of the inner hole 9.

As described above, according to this embodiment, the inner hole 9 of the plastic layer 4 has a step 10 between the inner surface of the inner hole 8 of the stator core 2 and the inner hole 8 of the stator core 2.
The plastic layer 4 is molded so that the inner diameter of the inner hole 9 is larger than the inner diameter of the inner hole 9. However, in the past, the inner surface of the inner hole 8 of the stator core 2 and the inner surface of the inner hole 9 of the plastic layer 4 were formed flush with each other, so that the lower mold 21 and the upper mold 22 Due to this, when molding the stator 1, plastic liquid infiltrates into the fitting part of the stator core 2 to the center mold 24, and burrs 4a are inevitably formed on the inner surface of the inner hole 8 of the stator core 2. When cutting the inner surface of the inner hole 8 of the stator core 2 to remove the burr 4a, the inner hole 8
Since the inner surface of the inner hole 9 is flush with the inner surface of the inner hole 9, it is extremely difficult to cut the inner surface of the inner hole 8, and burrs often remain on the inner surface of the inner hole 8. If such burrs remain, there is a problem that the rotor 11 may become locked. On the other hand, according to this embodiment, as described above, the plastic layer 4 is attached to the inner surface of the inner hole 8 of the stator core 2.
Since the plastic layer 4 is molded so that the inner surface of the stator core 2 has a step 10, there is almost no possibility that the plastic liquid will intrude into the part where the stator core 2 fits into the center die 24, and therefore the burr 4a
However, even if a temporary burr 4a occurs, the inner surface of the inner hole 9 has a step 10 with respect to the inner surface of the inner hole 8, so that the inner surface of the inner hole 8 is can be easily cut,
Therefore, there is no possibility that the rotor 11 will become locked due to residual burrs.

It should be noted that the present invention is not limited to the embodiments described above and shown in the drawings, but can be implemented with appropriate modifications within the scope of the invention, such as being applicable not only to electric motors but also to rotating electric machines in general. Of course.

According to the present invention as described above, plastic burrs are less likely to form on the inner surface of the stator core during plastic molding of the stator core and windings, and even if temporary burrs occur, they can be easily removed. Therefore, it is possible to provide a method for manufacturing a stator of a rotating electric machine in which the rotor is not locked by burrs.

[Brief explanation of the drawing]

The drawings show an embodiment in which the present invention is applied to an electric motor, in which FIG. 1 is a side view in cross section of the upper half of the electric motor, FIG. 2 is an enlarged sectional view of the upper half of the stator, and FIG.
The figure is a longitudinal sectional view of the molding die, and FIG. 4 is a partial longitudinal sectional view of the molding die for explaining the function. In the drawing, 1 is a stator, 2 is a stator core, 3 is a winding, 4 is a plastic layer, 4a is a burr, 8 is an inner hole, 9 is an inner hole, 10 is a step, 11 is a rotor, 2
0 is a mold mold, 21 is a lower mold (first mold), 22 is an upper mold (second mold), 2
4 is a center type, 26 is a stepped portion, and 31 is a center type.

Claims (1)

[Claims] 1. A first mold having a center mold in which the distal end side is made slightly smaller in diameter than the proximal end side and a stepped part is formed, and Using a second molding die having a center die formed to have approximately the same diameter as the end side, the stator core with the winding wound thereon is fitted into the center die of the first forming die, and one of the The end surface is brought into contact with the stepped part, and the end surface of the center mold of the second mold is brought into contact with the end surface of the center mold of the first mold, and then a plastic liquid is injected between both molds. By molding the stator core and the windings with plastic, the inner diameter of the plastic layer is larger than the inner diameter of the stator core so that the inner surface of the plastic layer has a step with respect to the inner surface of the stator core. 1. A method for manufacturing a stator for a rotating electric machine, characterized in that the plastic layer is molded so as to have a large size.