JP3431117B2 - Electric motor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric motor, and more particularly, to a structure of an insulator of a stator core and a molding of a terminal column for connecting an end of a stator winding.

[0002]

2. Description of the Related Art FIG. 1 is a plan view of a stator core of a conventional electric motor, FIG. 7 is a plan view of an example showing a connection side of a stator of the conventional electric motor, and FIG. 6 is a stator of the conventional electric motor. FIG. 3 is a plan view of a main part showing the terminal support of FIG. Conventionally, the winding of the stator core in the inner winding type electric motor in which the winding is directly wound from the inside of the stator core to the teeth has been performed by a three-nozzle winding machine. FIG. 7 shows the winding state of the stator by the winding method in this case on the connection side of the stator of a 24-slot 6-pole motor.

As shown in FIG. 1, a substantially I-shaped tooth portion 3 is provided from a yoke portion 2 of a stator core 1 at equal intervals. Symmetrical substantially U-shaped teeth 4 and 5 are provided on both sides of every other base end of the substantially I-shaped teeth 3, and an inner groove 6a and an outer groove are provided inside and outside the tooth, respectively. 6b, an inner groove 6c, and an outer groove 6d are formed to form the stator slot core 1 having 24 slots.

Here, at least the tips of the tooth portions facing the rotor are removed, and insert molding is performed with resin to cover the stator core 1 with the insert molding portion 7, and the outer grooves 6b and 6d on the connection side. And an inner wall 6c between the inner grooves 6a and 6c, an inner partition wall 7b at the inner peripheral portion, and the symmetrical substantially U-shaped tooth between the outer peripheral portion and the intermediate wall 7c as shown in FIG. Along the sections 4 and 5, the terminal support 7d3 on the right and the terminal support 7d at the center, which are provided with terminals for connecting windings at their tips
1. The left terminal support 7d2 is integrally projected.

Then, the outer winding 8a is wound between the outer groove 6b and the next outer groove 6d. Similarly, the outer windings 8b and 8c are wound around the other grooves. Then, the terminals AA ′, BB ′, CC ′ of the outer winding are led out from the connection side along the guide path of the insert molding, and as shown in FIG.
It is connected and fixed to the terminal of the terminal column by welding or soldering.

Next, the inner winding 9d is wound between the inner groove 6a and the next inner groove 6c. Similarly, the inner windings 9e and 9f are wound around the other grooves. Then, the terminals DD ′, EE ′, FF ′ of the inner winding are led out from the connection side along the guide path of the insert molding, and are connected and fixed to the terminals of the terminal support.

In this way, the terminals are connected to the printed circuit board to form a stator of an electric motor having 24 slots and 6 poles.

In this case, the position of the central terminal column 7d1 for supporting the terminal may be pulled and tilted toward the inner diameter side due to stress due to sink marks during the integral molding of the insulating layer. This is a problem when connecting the terminals to the printed circuit board.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and prevents a defect inclining to the inner diameter side at the time of molding a terminal support on the wire connection side of an electric motor,
It is an object of the present invention to provide an electric motor having improved reliability and improved productivity.

[0010]

In order to achieve the above object, substantially I-shaped tooth portions are provided at equal intervals from a yoke portion of a stator core, and every other one of the substantially I-shaped tooth portions is placed. A symmetrical U-shaped tooth portion is provided on both sides from the base end of the, and an inner groove and an outer groove are formed inside and outside the substantially U-shaped tooth portion, respectively, at least facing the rotor. Except for the tip of the tooth part, insert molding with resin to cover the stator core, an intermediate wall between the outer groove and the inner groove on the connection side, an inner partition wall on the inner peripheral part, an outer peripheral part and the intermediate wall. In between, and along the substantially U-shaped tooth portion, a right, center, left terminal column having a terminal for connecting the winding at its tip is integrally formed, and the outer winding is It is wound between the outer groove and the next outer groove, and then the inner winding is wound between the inner groove and the next inner groove, and the ends of those windings are connected to the terminals. Electric In machine, the inside of the terminal post, the terminal post is made to be to the rib to prevent the inclined radially inward during molding.

Alternatively, substantially I-shaped tooth portions are provided at equal intervals from the yoke portion of the stator iron core, and the substantially I-shaped tooth portions are symmetrical to each other on both sides from the base end of every other tooth portion. The inner groove and the outer groove are formed inside and outside the substantially U-shaped tooth, respectively, and an intermediate wall is formed between these outer groove and inner groove on the connection side. , An inner partition wall on the inner peripheral part, and a terminal for connecting windings at its tip along the substantially U-shaped tooth part between the outer peripheral part and the intermediate wall, the right, center, left The terminal winding is formed by mounting the insulator which forms the terminal support of the winding guide path, and the outer winding is wound between the outer groove and the next outer groove.
In an electric motor in which the inner winding is wound between the inner groove and the next inner groove, and the ends of those windings are connected to the terminals, the terminal strut is formed inside the terminal strut during molding. A rib extending in the axial direction is formed to prevent the rib from tilting toward the inner diameter side.

Then, the terminal support column is extended to both sides along the circumferential direction of the terminal, and ribs are formed from the ends of the extended portion.

Alternatively, the right, center, and left terminal columns are extended along the circumferential direction of the terminal to form a connecting wall, and a rib is formed from substantially the center of the connecting wall. .

Further, the height of the rib is formed in a substantially triangular shape which is gradually lowered from the extending portion or the connecting wall toward the inside.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Substantially I-shaped tooth portions are provided at equal intervals from a yoke portion of a stator iron core, and the substantially I-shaped tooth portions are symmetrical to each other from a base end of every other tooth portion. Providing a U-shaped tooth portion, forming an inner groove and an outer groove respectively inside and outside the substantially U-shaped tooth portion,
Excluding at least the tips of the tooth portions facing the rotor,
Covering the stator core by insert molding with resin, an intermediate wall between the outer groove and the inner groove on the connection side, an inner partition wall in the inner peripheral portion, and between the outer peripheral portion and the intermediate wall, the Along the U-shaped teeth, the right, center, and left terminal stanchions having terminals for connecting windings at their tips are integrally formed, and the outer winding is connected to the next outer groove from the outer groove. In an electric motor, in which the inner winding is wound between the inner groove and the next inner groove, and the ends of those windings are connected to the terminals,
Ribs are formed inside the terminal columns to prevent the terminal columns from inclining toward the inner diameter side during molding.

Further, it is possible to prevent the defect that the terminal support on the wire connection side of the electric motor is inclined toward the inner diameter side at the time of molding, and to improve the reliability.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described in detail with reference to the accompanying drawings with respect to a 24-slot 6-pole motor. The same parts as those in the conventional example have the same reference numerals.

FIG. 1 is a plan view of a stator core. Figure 2
FIG. 3 is a plan view showing a winding state of the stator in the winding system in this case, when one side of the stator is a connecting side.
2 is a plan view of an essential part in FIG. 2, and FIG. 4 is A in FIG.
It is a principal part sectional view corresponding to A '.

From the yoke portion 2 of the stator core 1, substantially I-shaped tooth portions 3 are provided at equal intervals. Symmetrical substantially U-shaped tooth portions 4 and 5 are provided on both sides of every other base end of the substantially I-shaped tooth portion 3, and an inner groove 6a and an outer groove are provided inside and outside the tooth portion, respectively. 6
b, the inner groove 6c and the outer groove 6d are formed to form the stator slot 1 of the 24 slots.

Here, excluding at least the tips of the tooth portions facing the rotor, insert molding is performed using PBT (polybutylene terephthalate) resin, which is a thermoplastic resin, and the stator core 1 is fixed by the insert molding portion 7. The intermediate wall 7c is provided between the outer grooves 6b, 6d and the inner grooves 6a, 6c on the side of covering and connection, the inner partition wall 7b is provided at the inner peripheral portion, and the symmetrical wall is provided between the outer peripheral portion and the intermediate wall 7c. U-shaped teeth 4,
5, a right terminal support column 7d3 having a terminal for connecting a winding at its tip, a central terminal support column 7d1, and a left terminal support column 7d2 are formed, and as shown in FIG.
Ribs 7f are formed by extending 3, 7d1 and 7d2 to both sides along the circumferential direction of the terminal, and extending axially from the end of the extending portion 7e.

Further, as shown in FIG. 4, the height of the rib 7f is formed in a substantially triangular shape which is gradually lowered from the extending portion 7e toward the inside.

Here, the outer winding 8a is wound between the outer groove 6d and the next outer groove 6b. Further, it is wound between the outer groove 6d adjacent thereto and the next outer groove 6b. Similarly, attach the outer winding 8 to each groove using another nozzle.
Wind b and 8c.

The terminals AA ', B of the outer winding are then
B'and CC 'are led out from the connection side along the guide path of the insert molding, and the ends of those windings are connected and fixed to the terminals.

Next, the inner winding 9d is wound between the inner groove 6a and the next inner groove 6c. Similarly, the inner windings 9e and 9f are wound around each groove by using another nozzle. The inner winding terminals DD ′, EE ′, F
F'is led out from the connection side along the guide path of the insert molding, and the ends of those windings are connected and fixed to the terminals. The terminals GG ', HH', and II 'are terminals of the deceleration winding that is wound around the outer windings 8a, 8b, and 8c, but the description thereof is omitted because they are not always necessary. In this way, a 24-slot 6-pole stator is formed.

Here, the terminal columns 7d3, 7d1, 7
The effect obtained by extending the d2 to both sides along the circumferential direction of the terminal and forming the rib 7f extending axially from the end of the extending portion 7e will be described.

At the base end of the substantially I-shaped tooth portion 3, substantially U-shaped tooth portions 4 and 5 which are symmetrical to the substantially I-shaped tooth portion 3 are concentrated, and in this portion, the above-mentioned Terminal support columns 7d3, 7d1, 7d
2. When the intermediate wall 7c and the like are formed, the influence of stress due to sink marks during molding of the thermoplastic resin is large.

In the case of the present invention, the terminal columns 7d3, 7d
Ribs 7f that extend 1, 7d2 to both sides along the circumferential direction of the terminal, and extend in the axial direction from the end of the extended portion 7e.
Since the above is formed, it is possible to reduce the influence of the stress applied to the terminal support when the resin is cured. Also,
Since the rib 7f is formed in a substantially triangular shape, it does not hinder the winding of the winding.

As a result, it is possible to prevent the terminal columns 7d3, 7d1 and 7d2 on the wire connection side of the electric motor from being inclined to the inner diameter side at the time of molding, and to improve reliability.

On the other hand, FIG. 5 is a plan view of an essential part of another embodiment of the present invention. In the case of this embodiment, the right terminal support 7
d3, the center terminal support 7d1, the left terminal support 7d2,
A connecting wall 7d is formed by extending along the circumferential direction of the terminal, and a rib 7f is formed inside from the substantially center of the connecting wall 7d. Further, the height of the rib 7f is set to be the same as that of the coupling wall 7
It is formed in a substantially triangular shape which is gradually lowered from d toward the inside.

As in the case of the above-described embodiment, the effect of this embodiment is that the rib 7f is formed, so that the influence of the stress applied to the terminal columns 7d3, 7d1 and 7d2 when the resin is cured is reduced. Can be done with similar results.

[0031]

As described above, according to the present invention, substantially I-shaped tooth portions are provided at equal intervals from the yoke portion of the stator core, and every other base end of the substantially I-shaped tooth portions is provided. By providing symmetrical U-shaped teeth on both sides, inside and outside of the U-shaped teeth,
Inner grooves and outer grooves are formed respectively, and at least the tips of the teeth that face the rotor are removed, and the stator core is insert-molded with a resin to cover the stator core, and between the outer groove and the inner groove on the connection side. An intermediate wall, an inner partition wall on the inner peripheral portion, and between the outer peripheral portion and the intermediate wall, along the substantially U-shaped tooth portion, the terminal provided with a terminal for connecting windings at its tip, The center and left terminal struts are integrally formed, the outer winding is wound between the outer groove and the next outer groove, and the inner winding is then wound between the inner groove and the next inner groove. In an electric motor that is wound and the ends of those windings are connected to the terminals, ribs are formed inside the terminal columns to prevent the terminal columns from inclining toward the inner diameter side during molding. did.

As a result, it is possible to prevent a defect in which the terminal column on the wire connection side of the electric motor is inclined toward the inner diameter side during molding, improve reliability, and improve productivity when connecting the terminal to the printed circuit board. You can

[Brief description of drawings]

FIG. 1 is a plan view of a stator core of the present invention and a conventional electric motor.

FIG. 2 is a plan view of an embodiment showing a connection side of a stator of an electric motor according to the present invention.

FIG. 3 is a plan view of a main part in FIG.

FIG. 4 is a cross-sectional view of a main part corresponding to AA ′ in FIG.

FIG. 5 is a main part plan view showing another embodiment of the present invention.

FIG. 6 is a main part plan view showing a terminal support of a stator of a conventional electric motor.

FIG. 7 is a plan view of an example showing a connection side of a stator of a conventional electric motor.

[Explanation of symbols]

1 Stator core 2 Yoke 3 Almost I-shaped teeth 4, 5 symmetrical U-shaped teeth 6a inner groove 6b outer groove 6c inner groove 6d outer groove 7 Insert molding part 7b Inner partition wall 7c Middle wall 7d1 Central terminal support 7d2 Left terminal support 7d3 Right terminal support 7d connecting wall 7e extension part 7f rib 8a Outer winding A 8b Outer winding B 8c Outer winding C 9d Inner winding D 9e Inner winding E 9f Inner winding F AA 'End of outer winding A BB 'End of outer winding B CC 'End of outer winding C DD 'End of inner winding D EE 'End of inner winding D FF 'End of inner winding F

Claims (5)

(57) [Claims] 1. A substantially U-shaped tooth portion is provided at equal intervals from a yoke portion of a stator core, and the substantially U-shaped portion is symmetrical to both sides from every other base end of the substantially I-shaped tooth portion. Tooth portions are provided, and an inner groove and an outer groove are formed inside and outside the substantially U-shaped tooth portion, respectively, except at least the tip of the tooth portion facing the rotor,
Covering the stator core by insert molding with resin, an intermediate wall between the outer groove and the inner groove on the connection side, an inner partition wall in the inner peripheral portion, and between the outer peripheral portion and the intermediate wall, the Along the U-shaped teeth, the right, middle, and left terminal stanchions with terminals for connecting windings are integrally formed, and the outer winding is connected to the outer groove from the outer groove. And then winding the inner winding between said inner groove and the next inner groove,
An electric motor in which terminals of those windings are connected to the terminals, wherein a rib is formed inside the terminal support pillar to prevent the terminal support pillar from inclining toward an inner diameter side during molding. . 2. A substantially U-shaped tooth portion is provided at equal intervals from a yoke portion of a stator core, and the substantially I-shaped tooth portion is symmetrical with a substantially U-shaped portion on both sides from the base end of every other tooth portion. The inner groove and the outer groove are formed inside and outside the substantially U-shaped tooth portion, and an intermediate wall is formed between these outer groove and inner groove on the connection side. , An inner partition wall on the inner peripheral part, and a terminal for connecting windings at its tip along the substantially U-shaped tooth part between the outer peripheral part and the intermediate wall, the right, center, left Is mounted with an insulator forming a guide path for the winding, the outer winding is wound between the outer groove and the next outer groove, and then the inner winding is connected to the inner groove. From the next to the inner groove,
In an electric motor in which the ends of those windings are connected to the terminals, a rib extending in the axial direction is formed inside the terminal column to prevent the terminal column from tilting toward the inner diameter side during molding. An electric motor characterized by. 3. The terminal strut is extended to both sides along the circumferential direction of the terminal, and ribs are formed from the end of the extended portion. Electric motor. 4. The right, center, and left terminal columns are extended along the circumferential direction of the terminal to form a coupling wall, and a rib is formed from substantially the center of the coupling wall. The electric motor according to claim 1 or 2. 5. The electric motor according to claim 1, wherein the height of the rib is formed in a substantially triangular shape in which the height gradually decreases from the extending portion or the connecting wall toward the inside.