JPH089601A - Device and method for manufacturing stator for molded motor and metallic mold with elastic body and compressing member - Google Patents

Abstract

PURPOSE:To provide a device and a method for manufacturing a stator for a molded motor which can prevent the adhesion of a synthetic resin to the internal surface of a stator core by improving the adhesion between a center core and the stator core at the time of molding a resin in the stator core and a metallic mold equipped with an elastic body and a compressing member. CONSTITUTION:A center core 26 is closely attached to a stator core 1 by expanding a pressing section 26b inserting a pressing section 26b composed of an elastic body having an outside diameter a little larger than the inside diameter of a stator core 1 and a conical or cylindrical hollow at its center into the stator core 1 and, at the time of clamping, inserting a projecting inserter 24a having an outside diameter a little larger than the inside diameter of the hollow into the hollow.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a stator of a molded motor, in which a stator core is molded with a synthetic resin, a manufacturing apparatus therefor, and a mold having an elastic body and a compression section.

[0002]

2. Description of the Related Art FIG. 9 is a vertical sectional view schematically showing one of conventional manufacturing apparatuses for a stator of a molded motor.
FIG. 6 is a diagram schematically showing a part of the XX cross section. In the figure, reference numeral 1 denotes a stator core in which a predetermined number of annular core pieces are laminated, and this stator core 1 is provided with slots 1a for winding windings 2 and slot openings 1b. 3 is a synthetic resin having a thermosetting property, and the mold is a resin of a stator composed of an upper mold 4 which is a fixed side and a lower mold 5 which is a movable side, and which includes a stator core 1 and a winding 2. The inside is shaped into a predetermined shape for molding. 6 is a core fixed to the lower mold 5 by a fixing tool such as a screw (not shown), and 7 is melted in the mold when the stator core 1 and the core 6 are enclosed. It is a synthetic resin injection port through which the synthetic resin 3 in a fluid state is poured.

In a method of manufacturing a stator of a molded motor in which a stator of an electric motor is resin-molded with a synthetic resin 3, generally, a stator core 1 having windings 2 in a slot 1a is provided with a lower metal in an inner diameter portion. After inserting the core 6 fixed to the mold 5, the upper mold 4 and the lower mold 5 are clamped, and the synthetic resin 3 in a fluid state is injected from the synthetic resin injection port 7 and heated.
By heating, the synthetic resin 3 is cured, and the stator core 1 and the winding 2 are molded and solidified by the resin mold. Here, since the synthetic resin 3 is used for a molded motor, the synthetic resin 3 has heat resistance to withstand the heat generated from the stator core 1 and the winding 2, the fluidity of the resin that facilitates the casting work of the resin, and the fixation. It is necessary to use a resin having good adhesion between the child core 1 and the winding wire 2 and the synthetic resin 3, and a thermosetting synthetic resin such as an epoxy resin, a polyester resin, a polyurethane resin or a silicone resin is generally used. By the way, since the core 6 is inserted into the inner diameter portion of the stator core 1, the outer diameter dimension of the center core 6 needs to be made somewhat smaller than the inner diameter dimension of the stator core 1 from the viewpoint of workability such as insertion and removal. Therefore, there is a gap between the outer diameter surface of the core 6 and the inner diameter surface of the stator core 1. Therefore, synthetic resin 3
When injecting, the synthetic resin 3 also enters this gap, and since the synthetic resin 3 is heated in the state where it enters this gap, the solidified synthetic resin 3 adheres to the inner diameter surface of the stator core 1. To do. Therefore, in such a case, it is necessary to cut the inside diameter of the stator after resin molding in order to remove the attached synthetic resin 3, which increases man-hours and causes a cost increase.

Therefore, for example, JP-A-61-15063
As disclosed in Japanese Patent Publication No. 8, the core 6 is formed of a material (for example, zinc) having a coefficient of thermal expansion larger than that of the stator core 1,
Also, by using a core whose outer diameter is machined smaller than the inner diameter of the stator core 1, after inserting the core 6 into the stator core 1, the core 6 is heated and expanded to 6 and the inner diameter portion of the stator core 1 are closely fitted together, and then the synthetic resin 3 is injected to prevent the synthetic resin from adhering between the core 6 and the stator core 1.

[0005]

In the conventional method of manufacturing a molded motor, the core 6 is heated and expanded as described above.
Since it is closely fitted to the inner diameter portion of the stator core 1, a heating time and a heating device for heating the core 6 are required. Further, since the stator core 1 is generally formed by laminating magnetic thin plates manufactured by punching or the like, the inner diameter of the stator core 1 varies. In order to bring the core 6 into close contact with the inner diameter surface of the stator iron core 1 by heat expansion in response to this variation, considering the ease of insertion work of the core 6 and the degree of close contact, the temperature of the core 6 is raised to some extent. It is necessary to increase the expansion degree. Therefore, a special heating device for heating the core 6 to a high temperature and a heating time for heating are required. The heating time of the core 6 becomes large when the motor having a particularly large size is targeted, so that the size of the core 6 also becomes large, so that the heat capacity becomes large, the heating time becomes long, the productivity is deteriorated, and the cost is reduced. Leads to up. To remove the resin-molded stator core 1 from the core 6, expansion of the core 6 that is in close contact with the inner diameter of the stator core 1 is eliminated, and the core 6 and the stator core 1 are separated from each other. Since it is necessary to eliminate adhesion, the core 6
Must be cooled to room temperature or lower to shrink the core 6 itself, but since the stator core 1 is entirely covered with the synthetic resin 3, its heat capacity is large and it takes a long time to cool. Productivity is poor because it takes time. Further, in order to produce the stator, the heating time for closely fitting the core 6 to the stator core 1 and the cooling time for removing the core 6 from the stator core 1 must be taken into consideration. It is necessary to prepare a plurality of cores 6 for mass production, which leads to an increase in manufacturing cost.

The present invention has been made to solve the above-mentioned problems, and as a first object thereof, a special heating device for the core is required to bring the core into close contact with the inner diameter of the stator core. It is to obtain a manufacturing apparatus and a manufacturing method that do not. A second object is to obtain a manufacturing apparatus that improves productivity by satisfying the first object and expanding a core at the same time as mold clamping. Furthermore, the third
It is an object of the present invention to provide a manufacturing apparatus that can easily insert the core into the inner diameter portion of the stator iron core while satisfying the first object. Furthermore, a fourth object is to obtain a manufacturing apparatus which can uniformly press the inner diameter portion of the stator core by the core while satisfying the first and second objects. Further, a fifth object is to obtain a manufacturing apparatus which satisfies the first to fourth objects and prevents the synthetic resin from adhering to the slot openings of the stator core. In addition, the sixth purpose is satisfying the fifth purpose. Another object of the present invention is to obtain a manufacturing apparatus in which a resin-molded stator can be easily removed from the core. A seventh object is to obtain a mold having an elastic body and a compression member for expanding the elastic body housed in the mold sealed space by clamping the mold.

[0007]

A molded motor stator manufacturing apparatus according to the present invention includes a core core which is inserted into an inner diameter portion of an annular stator core and at least a part of an outer diameter surface of which is made of an elastic body. , A resin mold molding die in which the core and the stator core are encapsulated inside, and a resin injection port for injecting resin in the encapsulated state is provided, and a resin mold molding die At the time of resin injection, a compression member is provided which compresses the elastic body portion of the core to bring it into close contact with the inner diameter surface of the stator core.

[0008] The mold is composed of an upper mold and a lower mold, at least one of which moves during resin injection to enclose the core and the stator core, and the compression member has the upper mold and the lower mold. The core is fixed to the mold and the core is compressed by the movement of the compression member accompanying the movement of the mold.

The core has a cylindrical shape, and the outer diameter of the core is smaller than the inner diameter of the stator core.

The core has a conical or cylindrical recess in the axial direction, and the compression member has a conical or cylindrical recess having a convex insert inserted into the recess of the core. The outer diameter of the inserter is made larger than the outer diameter of the hollow of the core at a constant rate.

Further, when the core of the elastic body is compressed by being interposed between the slot opening provided on the inner diameter surface of the stator core and the outer diameter surface of the core, the center core is inserted into the slot opening. It is provided with a slot opening closely contacting member for preventing the core from intervening to prevent the core from entering.

Further, the present invention is provided with a holding member made of an elastic body for holding the slot opening closely contacting member and the slot opening closely contacting member for promoting the separation at the time of mold opening.

Further, a pair of molds provided with a resin injection port for molding a sealed space by co-action, and a cylindrical shape, and one flat surface of the cylinder is fixed to one of the pair of molds. And a compression member fixed to the other of the pair of molds so as to press the other flat surface of the elastic body or the inner surface of the elastic body. It is a thing.

In the method of manufacturing a stator for a molded motor according to the present invention, the first step of inserting the elastic core into the inner diameter portion of the stator core, and the stator core and the core inside the mold. While enclosing the core, compress the inserted core,
A second step of expanding the inner core in the outer diameter direction so as to be in close contact with the inner diameter surface of the stator core; and thereafter, a third step of injecting a resin into the mold to perform resin molding. It is a thing.

[0015]

In the molded motor manufacturing apparatus configured as described above, the elastic core is inserted into the inner diameter portion of the stator core,
The inner core and the inner diameter surface of the stator core are brought into close contact with each other by compressing and expanding the inner core when injecting the resin, so that heating is not required.

Also, the elastic core of the elastic body is sealed in the mold, and the core is compressed and expanded by the movement of the compression member fixed to the mold as the upper mold and the lower mold move. Since the contact between the core and the inner diameter surface of the stator core is performed at the same time as the mold clamping, the time from the expansion of the core to the mold clamping is shortened.

Further, since it has a cylindrical shape and the outer diameter of the core is smaller than the inner diameter of the stator core, the center can be easily inserted into the inner diameter of the stator core.

Further, by inserting an inserter having an outer diameter dimension which is made larger than the inner diameter dimension of the recess at a constant rate into a conical or cylindrical recess provided in the axial direction of the inner core of the elastic body, The inner diameter portion of the stator core can be pressed with a uniform pressure.

Further, by interposing a slot opening closely contacting member for preventing core core intervention between the slot opening provided on the inner diameter surface of the stator core and the portion where the expanded core contacts. It is possible to prevent the expanded core from entering the slot opening more than necessary.

Further, at the time of mold opening in which the expansion of the core is stopped, the slot opening close contact member is automatically removed by the holding member for holding the slot opening close contact member having elasticity, and the contact between the stator core and the center core is made. Can be eliminated.

Further, a cylindrical elastic body fixed to one of the pair of molds presses the other flat surface or inner surface of the cylindrical body of the elastic body by a compression member provided in the other mold,
A cylindrical elastic body can be expanded.

Further, a stator core having an inner core portion of an elastic body inserted therein is sealed in a mold, and the center core is compressed and expanded in the outer diameter direction to be fixed to the center core. No heating is required because the inner core surface of the child core is in close contact.

[0023]

【Example】

Example 1. 1 and 2 are schematic views schematically showing an apparatus for manufacturing a stator of a molded motor which is an embodiment of the present invention, and FIG. 1 is a vertical cross-sectional view schematically showing the mold opening time. [Fig. 4] is a vertical cross-sectional view schematically showing the time of mold clamping. In the figure, 1 to 3 are the same as the above-mentioned conventional example, and therefore the description thereof is omitted. 14 is an upper mold, 15 is a lower mold,
One or both of the upper mold 14 and the lower mold 15 move to complete the mold clamping. A compression member 14a made of iron, stainless steel or the like is fixed to the upper mold 14. Reference numeral 16 denotes a core, and this core 16 has a pedestal portion 16a made of iron, stainless steel or the like like the compression portion 14a, and a rubber material made of, for example, an elastic material such as a silicon resin or a silicon material, at least the outer diameter surface of which is configured. It is composed of the pressed portion 16b. A pedestal portion 16a is screwed and fixed to the lower mold 15, and a pressing portion 16b is fixed to the pedestal portion 16a by screwing or the like.

The axial length of the pressing portion 16b is slightly longer than the axial length of the inner diameter portion of the stator core 1, and the outer diameter dimension is slightly smaller than the inner diameter dimension of the stator core 1. Therefore, a gap B exists between the pressing portion 16b and the stator core 1. Due to the existence of the gap B, the inner diameter portion of the stator core 1 can be easily inserted into the core 16. Further, the pressing portion 16b is provided with a step portion C as shown in FIG. 1B so that the end portion of the stator core 1 can be positioned. Reference numeral 17 denotes a synthetic resin injection port provided in the lower mold 15, and the synthetic resin 3 passes through the resin injection port 17 when the upper mold 14 and the lower mold 15 are resin-clamped. It is injected into the lower mold 14 and the lower mold 15 to be resin-molded. Further, the lower die 15 is provided with a pin 18 for pushing out the stator formed of the resin core and the stator core 1 and the winding 2 by moving in the direction of arrow A in the figure.

Next, a method of manufacturing the stator of the molded motor will be described. First, the core 16 is inserted into the stator core 1 having the windings 2 provided in the slots. Next, in order to facilitate the release of the resin mold from the inner surfaces of the upper mold 14 and the lower mold 15, the compression member 14a, the surface of the core 16, and the like, the mold release is facilitated. A mold is applied. This mold release agent varies depending on the resin to be injected, but if it is a thermosetting synthetic resin agent such as the above-mentioned epoxy resin, polyester resin, polyurethane resin, silicone resin,
Generally, a silicon-based release agent is used. Next upper mold 1
The mold 4 and the lower mold 15 are clamped by hydraulic pressure based on a command from a control device (not shown). With this mold clamping, the compression member 14a compresses the upper surface of the pressing portion 16b, and there is no escape area for the force compressed by the pedestal portion 16a fixed to the lower mold 15, and the pressing portion 16b is The length in the direction decreases, the outer diameter expands, and the gap B disappears, and the inner diameter surface of the stator core 1 is closely fitted. At the time of resin injection when the mold clamping is completed, the thermosetting synthetic resin 3 in a fluidized state is poured from the synthetic resin injection port 17 and is capped and then heated. By this heating, the synthetic resin 3 is hardened, and the resin molding of the stator including the stator core 1 and the winding 2 is completed.

When the resin molding of the stator with the synthetic resin 3 is completed, the pin 18 pushes up the resin-molded stator from below, and although not shown in the figure, a command signal from the control device causes Pin 18
The upper mold 14 moves in the upper direction in conjunction with
And the lower die 15 are opened. With this mold opening,
Pressing part 1 by compression member 14a fixed to upper mold 14
The compression of 6b is completed, and the pressing portion 16b does not expand in the outer diameter direction due to the elastic restoring force. The shape of the pressing portion 16b is
The original shape where the axial length is slightly longer than the axial length of the stator core 1 and the outer diameter dimension is slightly smaller than the inner diameter dimension of the stator core 1 to the shape before compression and the gap B exists. Return to. In this shape, the pressing portion 16a and the stator core 1
Since the inner diameter surface of is not closely fitted, the stator core 1 can be easily removed from the upper mold 14 and the lower mold 15 with the effect of the pin 18 and the mold release material for pushing the stator in synchronization. The resin mold forming work ends.

According to the above-described manufacturing method, the expanded pressing portion 16b is closely fitted to the inner diameter surface of the stator core 1, so that the contact surface between the inner diameter surface of the stator core 1 and the pressing portion 16b is slightly There is no gap. In this state, the synthetic resin 3 is poured and heated to perform resin molding on the stator, so that the synthetic resin 3 does not adhere to the inner diameter surface of the stator core 1. Therefore, the inner diameter cutting process for cutting the resin adhered after the resin molding is not necessary, and the productivity of the stator of the molded motor is improved.

By the way, in the present embodiment, the constituent element of the pressing portion 16b of the core 16 is described as a silicon resin, but the present invention is not limited to this, and for example, another elastic body such as rubber or plastic may be used. It goes without saying that the same effect can be obtained even if there is. In addition, the core 16 is attached to the lower mold 15
As described in the case of the fixed type fixed to the
There is no problem even if it is detachable.

Example 2. 3 and 4 are schematic views showing a manufacturing apparatus for a stator of a molded motor according to another embodiment of the present invention. FIG. 3 is a vertical sectional view schematically showing the mold opening time, and FIG. It is a longitudinal cross-sectional view schematically showing the time of mold clamping. In the figure, 1 to 3 are exactly the same as those of the first embodiment, and 24, 25, 26a, 27 and 28 correspond to 14, 15, 16a, 17 and 18 described in the first embodiment, respectively. Since the configuration and the operation are the same, the description will be omitted. Reference numeral 21 is a portion corresponding to the bracket, which is formed by simultaneously molding the synthetic resin 3 with a mold. Reference numeral 24a is an inserter, which is a compression member fixed to the upper die 24 with screws or the like and formed of a metal material such as iron or stainless steel. 26 is a pedestal portion 26 a and this pedestal portion 26 a
The core is composed of a pressing portion 26b formed of an elastic body (for example, rubber material made of silicon resin or silicon material) fixed to a by screwing or the like.

Here, each component will be described in detail as follows.
The inserter 24a has a conical shape extending to the root portion fixed to the upper mold 24. On the other hand, the pressing portion 26
b has a substantially V-shaped recess so that the inserter 24a can be inserted. The outer diameter of the connecting surface of the inserter 24a with the upper mold 24 is designed to be slightly larger than the inner diameter of the inlet portion E of the substantially V-shaped depression of the pressing portion 26b, and the bottom surface D of the inserter 24a is The outer diameter is designed to be slightly larger than the inner diameter of the bottom surface portion F of the substantially V-shaped depression of the pressing portion 26b. In this way, the outer diameter of the inserter 24a is approximately V of the pressing portion 26b.
It is designed to be slightly wider overall than the inner diameter of the V-shaped recess. Further, the length of the inserter 24a and the pressing portion 26
The relationship between b and the depth of the substantially V-shaped recess is related to the moving distance of the mold when the upper mold 25 and the lower mold 25 are clamped, but the same or longer insert 24a is used. Design to do.

The insert 24a and the pressing portion 26b are shaped as described above because the insert 24a is securely inserted into the pressing portion 26b without a gap, and the pressing portion 26b is compressed by being compressed from the inside of the recess. This is because the expansion is evenly made in the radial direction so that the stator core is completely closely fitted on the inner diameter surface. In other words, in the present embodiment, the inserter 24a and the pressing portion 26b having the above-mentioned shapes are used, but a mechanism having such characteristics is effective without being caught by them. Further, a step portion G for integrally molding the bracket is provided at the tip of the core 26.

Next, the manufacturing method will be described. First, the stator core 1 having the windings 2 provided in the slots is inserted into the core 26. Next, in order to facilitate the mold release of the resin mold on the inner peripheral surfaces of the upper mold 24, the lower mold 25, and the surface of the core 26, the same mold release material as in Example 1 is applied. . At this time, since the outer diameter of the pressing portion 26b is formed to be slightly smaller than the inner diameter of the stator core 1, it can be easily inserted. Next, the upper mold 24 and the lower mold 25 are hydraulically clamped based on a command from the controller. With the mold clamping, the inserter 24a fixed to the upper mold 25 is inserted into the substantially V-shaped recess of the pressing portion 26b. At this time, since the inner diameter of the substantially V-shaped depression of the pressing portion 26b is made slightly larger than the outer diameter of the inserter 24a, it is inserted as the inserter 24a is inserted into the pressing portion 26b as the mold is clamped. The outer diameter surface of the child 24a uniformly compresses the inner diameter surface of the substantially V-shaped recess of the pressing portion 26b, and the elastic structure of the pressing portion 26b causes the pressing portion 26b to expand in the outer diameter direction, so that the stator core 1 Then, the upper die 24 and the lower die 25 come into close contact with each other, and the mold clamping is completed.

After that, at the time of injecting the resin after the mold clamping is completed,
The synthetic resin 3 in a fluid state is injected from a synthetic resin injection port 27 provided in the lower mold 25, and after plugging, it is heated. By heating, the synthetic resin 3 is hardened, and the resin molding of the stator including the stator core 1 and the winding 2 is completed. When the resin molding of the stator by the synthetic resin 3 is completed, the pin 28 pushes up the resin-molded stator from below, and although not shown in the figure, the pin 28 is pushed by a command signal from the control device. The upper die 24 moves in the upward direction in conjunction with each other, and the upper die 24 and the lower die 25 open the die. As the die opens, the inserter 24 fixed to the upper die 24
a is taken out from the pressing portion 26b, the expansion of the pressing portion 26b is completed, the pressing portion 26b contracts in the inner diameter direction by the elastic restoring force, and the pressing portion 26b returns to the original shape. In this state, since the pressing portion 26b and the inner diameter surface of the stator core 1 are not closely fitted to each other, the stator core 1 can be moved to the upper mold with the effect of the pin 28 and the mold release material that push out the stator in synchronization. The resin mold forming work is completed by easily removing the resin mold 24 and the lower mold 25.

During the injection and curing of the synthetic resin 3, since the inner core 26 is in complete contact with the inner diameter surface of the stator core 1, there is no slight gap. Since there is no gap, the synthetic resin 3 does not adhere to the inner diameter surface of the stator core 1, and the inner diameter cutting process for removing the resin after resin molding is not necessary, and the productivity of the stator of the mold motor is improved. Further, according to the above configuration and process, unlike the case of the first embodiment, since the core 26 is not compressed in the axial direction, the core corresponds to the pressing portion corresponding to the inner diameter surface of the stator core in the outer diameter direction. Since the inner surface of the stator core is pressed evenly and evenly, the imperfect shape of the molded resin does not occur during resin molding. Therefore, when the bracket-corresponding portion 21 is also molded with the synthetic resin 3 at the same time,
It is possible to deal with the case where the shape of the core 26 has the step F, and as shown in FIG. 5, it is possible to obtain the stator of the molded motor provided with the bracket portion 21 at the same time.

Example 3. Further, in the case where the core and the stator core are brought into close contact with each other by the inserter and the pressing portion described in the second embodiment, between the slot opening provided on the inner diameter surface of the stator core and the surface of the pressing portion. When the elastic core of the elastic body is compressed, a slot opening adhesion member is provided to prevent the core from entering the slot opening when the elastic core of the pressing section is opened more than necessary. An embodiment for preventing the entry into the section will be described with reference to FIGS. 6 and 7. FIG. 6 is a vertical cross-sectional view schematically showing a state at the time of mold clamping in the method for manufacturing the stator of the molded motor according to the third embodiment of the present invention, and FIG. 7 is a VII in FIG.
It is a figure which shows a part of -VII cross section typically. In the figure, 1, 1a, 1b, 2, 3 are exactly the same as the above-mentioned conventional example, and 34, 34a, 35, 36, 36a, 36b,
37, 38, 24, 24a, 25 described in the second embodiment,
26, 26a, 26b, 27, and 28, respectively, and the configurations and operations are the same, so description thereof will be omitted.

36c is interposed between the slot opening provided on the inner diameter surface of the stator core and the outer diameter surface of the pressing portion 36b of the core, and this core is opened when the core of the elastic body is compressed. It is for prevention of core intervention to prevent entering into the part,
The slot opening contact member is made of a low material having less elasticity than the elastic body that is a constituent element of the pressing portion 36b, for example, a metal material such as stainless steel or a hard material such as ceramics. In this embodiment, the slot opening contact member 36
The shape of c will be described as a pentagonal shape in which the tip end is finely cut into a mountain shape as shown in the drawing. However, in addition to the shape of the slot opening contact member 36c in this embodiment, the slot 1a
Needless to say, similar effects can be obtained as long as the shape is such that it has a relationship with the winding 2 wound around it, is easily attached to the slot opening 1b, and does not hinder resin molding. If the mountain-shaped portion at the tip of the slot opening contact member 36c is long (high), it will enter the slot opening 1b and damage the winding 2 wound in the slot 1a. Need to be designed in length. Further, although it is a method of adhering to the pressing portion 36b, any holding method such as hooking on a part of the pressing portion 36b so as not to be easily removed from the core 36 may be used.

Next, the manufacturing method will be described. First, when inserting the stator core 1 with the winding 2 into the core 36,
The slot opening 1b of the stator core 1 and the slot opening contact member 36a provided in the pressing portion 36b are slid and inserted while aligning. Since the following procedure is the same as that of the second embodiment described above, only the items related to the slot opening contact member 36c will be described, and the others will be omitted. Due to the shape relationship between the substantially V-shaped depression of the pressing portion 36b and the convex insert 34a, the pressing portion 36b of the elastic body expands.
The portion that originally comes into close contact with the slot opening 1b is hindered from expanding by the slot opening closely contacting member 36c made of metal, and even if the pressing portion 36b expands too much, an elastic body may enter the slot 1a through the slot opening 1b. Since there is no slot, the synthetic resin 3 can be completely filled in the slot opening 1b. Here, the slot opening 1b has a slot opening contact member 36c.
Are closely attached to each other, no gap is formed in the stator core 1, and the mold resin is not attached to the inner diameter portion of the stator core 1. The slot opening closely contacting member 36c is provided on the corner of the slot opening 1b of the stator core 1 and the pressing portion 36b.
By preventing direct contact with the pressing portion 36b
Wear can be prevented. Therefore, the core 36 can be easily brought into close contact with the inner diameter of the stator core 1 while preventing damage and wear of the core 36, and a stator of a molded motor with stable quality can be manufactured.

Example 4. Further, the slot opening contact member is provided on the outer peripheral surface of the pressing portion described in the third embodiment,
When preventing the elastic body of the pressing portion from entering the slot opening more than necessary, a compression spring that promotes separation between the slot opening closely contacting member and the slot opening during mold opening,
FIG. 8 is a vertical cross-sectional view schematically showing a state at the time of mold clamping in the method for manufacturing the stator of the mold motor in FIG. 8 in which an example provided between the slot opening closely contacting member and the holding portion of the slot opening closely contacting member is provided. It demonstrates using. In the figure, 1 to 3 are exactly the same as the conventional example, and 44, 44a, 45, 46
a, 46b, 46c, 47, and 48 are 34, 34a, 35, 36a, 36b, 36c, 37, which are described in the third embodiment.
38, and the configurations and effects are also the same, so description thereof will be omitted. 46d is a holding portion for the slot opening closely contacting members 46c provided at the upper and lower ends of the core 46, and is formed by a metal ring such as iron or stainless steel. Reference numeral 46e is a compression spring provided between the slot opening contact member 46c and its holding portion 46d.

With this construction, when the inserter 44a is inserted into the pressing portion 46b during mold clamping and the pressing portion 46b expands in the radial direction, the slot opening contact member 46c also compresses in the outer radial direction. Therefore, the slot opening contact member 4
6c and the compression spring 4 provided between the holding part 46d.
6e is compressed and elastic energy is accumulated. When the mold is opened, the pressing portion 46b of the elastic body returns to its original shape by removing the inserter 44a, but the compression spring 46e also acts in the direction of returning the slot opening contact member 46c by the compressed elastic energy. . Therefore, even if the core 46 is heated by the stator core 1 or the synthetic resin 3 and swells due to thermal expansion, and the adhesion force between the stator core 1 and the core 46 increases, the elastic energy of the compression spring 46e is increased when the mold is opened. The action enables the core 46 to be easily removed from the stator core 1.

The compression spring 46e in this embodiment is also used.
In the above, an example in which the pressing portion 46b is attached in a direction in which it is compressed when expanded is explained, but the present invention is not limited to this, and the opposite may be applied, and an elastic force other than the compression spring 46e may be used. Needless to say, the same effect can be obtained by mounting the same structure. Further, although the metal ring has been described as the holding portion 46d, the same effects can be obtained in the present embodiment as long as other materials and shapes such as ceramics can be used as long as the same mechanism can be obtained.

By the way, although the case where the constituent element of the pressing portion is made of the silicone resin has been described in the above embodiments, the present invention is not limited to this, and the same effect can be obtained by using another elastic body such as rubber or plastic. It goes without saying that you can get Further, regarding the substantially V-shaped hollow shape of the core and the convex shape of the inserter in the second to fourth embodiments, a concave elastic body other than the present embodiment is used, and a convex inserter. The same effect can be obtained if the structure is used for compression and expansion.

[0042]

Since the present invention is constructed as described above, it has the following effects. At the time of resin injection for resin molding of the stator core, the core of the elastic body is compressed and the core is brought into close contact with the inner diameter surface of the stator core, so the core is expanded by heating the core. No equipment needed for.

Further, in addition to the above structure, the core of the elastic body is compressed with the movement of the compression member that compresses the core with the movement of the mold, so that the expansion of the core simultaneously with the mold clamping. It can be done, work time can be shortened, and productivity can be improved.

Further, since the inner core has a cylindrical shape and the outer diameter of the inner core is equal to or smaller than the inner diameter of the stator core, the inner core can be easily inserted into the inner diameter of the stator core, and the working efficiency is improved. improves.

Further, by inserting a convex inserter having an outer diameter increased at a constant ratio from the inner diameter of the hollow into a conical or cylindrical hollow provided in the axial direction of the inner core, Since the pressing portion corresponding to the inner diameter surface of the stator core is uniformly pressed from the inside in the outer diameter direction to compress and expand,
The inner peripheral surface of the inner diameter portion of the stator core can be pressed easily and evenly and uniformly. Therefore, during resin molding
Incomplete shape does not occur in the molded resin.

Further, between the slot opening of the stator core and the elastic body of the outer diameter surface of the core, there is provided a slot opening contact member for preventing the core from intervening to prevent the core from entering the slot opening. By providing the core, the slot opening adhesion member prevents the slot core from biting into the slot opening of the stator core due to the expansion of the elastic body, and the slot is not resin-molded. Thereby, it is possible to prevent the core of the elastic body from being damaged. Therefore, it is possible to improve the productivity and to produce a stator of a molded motor with stable quality.

Further, since the holding member for holding the slot opening closely contacting member for promoting the separation between the slot opening closely contacting member and the slot opening is used when the mold is opened, the center core is made of synthetic resin or the stator. Even when heated by the iron core and thermally expanded, the slot opening closely contacting member can easily remove the stator iron core from the core, work time can be shortened, and productivity can be improved.

Further, a pair of molds having a compression member in which one plane of a cylindrical elastic body is fixed to one side and the other plane or inner surface of the elastic body is fixed to the other side can be provided. Since the elastic body is used, the elastic body is compressed and expanded, so that, for example, in manufacturing a stator of a molded motor, a device for expanding the elastic body by heating is not required.

Since the stator core having the core inserted therein is enclosed in the mold, and the core is compressed and expanded in the outer diameter direction, the core is expanded by heating, and in a shorter time than the conventional method. The core can be brought into close contact with the inner diameter portion of the stator core, improving productivity.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view schematically showing a state when a mold is opened in a method of manufacturing a stator for a molded motor according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view schematically showing a state during mold clamping in the method of manufacturing a stator for a molded motor according to the embodiment of the present invention.

FIG. 3 is a vertical cross-sectional view schematically showing a state at the time of mold opening in a method of manufacturing a molded motor stator according to another embodiment of the present invention.

FIG. 4 is a vertical cross-sectional view schematically showing a state during mold clamping in a method of manufacturing a stator for a molded motor according to another embodiment of the present invention.

FIG. 5 is a cross-sectional view of a molded motor having a manufactured bracket portion in a method of manufacturing a molded motor stator according to another embodiment of the present invention.

FIG. 6 is a vertical cross-sectional view schematically showing a state at the time of mold clamping in the method for manufacturing the stator of the molded motor according to the third embodiment of the present invention.

FIG. 7 is a view showing a third embodiment of the present invention in a method of manufacturing a stator for a molded motor, wherein VII- in a state during mold clamping.
It is a sectional view showing a part of VII section typically.

FIG. 8 is a vertical cross-sectional view schematically showing a state at the time of mold clamping in the method for manufacturing the stator of the molded motor according to the fourth embodiment of the present invention.

FIG. 9 is a vertical cross-sectional view schematically showing a state during mold clamping in a conventional method for manufacturing a stator of a molded motor.

FIG. 10 is a cross-sectional view schematically showing a part of the XX cross section in the state during mold clamping in the conventional method of manufacturing a stator of a molded motor.

[Explanation of symbols]

1 Stator core
2 winding 3 synthetic resin 14, 24, 34,
44 Upper mold 14a Compressing parts 24a, 34a, 4
4a Inserter 15, 25, 35, 45 Lower mold 16, 26, 3
6, 46 Core 16a, 26a, 36a, 46a Pedestal part 16b, 26b, 36b, 46b Pressing part 36c, 46c Slot opening contacting member 17, 27, 37, 47 Resin injection port 46d Holding part
46e spring

Claims (8)

[Claims] 1. An annular stator core is inserted into an inner diameter portion of the stator core,
At least a part of the outer diameter surface is a core made of an elastic body, and the core and the stator core are sealed inside, and a resin mold is provided with a resin injection port for injecting resin in this sealed state. A molding die, and a compression member for compressing the elastic body portion of the core to bring it into close contact with the inner diameter surface of the stator core when the resin is injected into the resin molding die. Characteristic Molded Motor Stator Manufacturing Equipment. 2. The mold comprises an upper mold and a lower mold, at least one of which moves during resin injection to enclose the core and the stator iron core, and the compression member has the upper mold or the lower mold. The apparatus for manufacturing a stator of a molded motor according to claim 1, wherein the core is fixed to a mold and the core is compressed by the movement of the compression member accompanying the movement of the mold. 3. The fixed mold motor according to claim 1 or 2, wherein the core has a cylindrical shape and an outer diameter dimension thereof is equal to or smaller than an inner diameter dimension of the stator core. Child manufacturing equipment. 4. The core has a conical or cylindrical recess in the axial direction, and the compression member has a conical or cylindrical recess having a convex insert inserted into the recess of the core. 3. The apparatus for manufacturing a stator for a molded motor according to claim 1 or 2, wherein an outer diameter of the inserter is made larger than an inner diameter of the hollow of the core. 5. A core of the elastic body is interposed between the slot opening provided on the inner diameter surface of the stator core and the outer diameter surface of the core, and when the core of the elastic body is compressed, the center core is inserted into the slot opening. The apparatus for manufacturing a stator of a molded motor according to any one of claims 1 to 4, further comprising: a slot opening closely contacting member for preventing a core from intervening. 6. A holding member for holding the slot opening closely contacting member, which is made of an elastic body and promotes separation of the slot opening closeness member and the slot opening at the time of mold opening, is provided. An apparatus for manufacturing a stator of a molded motor according to item 5. 7. A pair of molds provided with a resin injection port inside which a sealed space is formed by co-operation, and a cylindrical shape, wherein one flat surface of the cylinder is fixed to one of the pair of molds. An elastic body having a size that can be accommodated in the sealed space, and a compression member fixed to the other of the pair of molds so as to press the other flat surface of the elastic body or the inner surface of the elastic body, A mold having an elastic body and a compression member. 8. A first step of inserting an elastic core into an inner diameter portion of a stator core; enclosing the stator core and the core in a mold, and compressing the inserted core. A second step of expanding the inner core in the outer diameter direction to bring it into close contact with the inner diameter surface of the stator core, and thereafter, a third step of injecting a resin into the mold to form a resin mold. A method of manufacturing a stator for a molded motor, comprising: