JPH06225490A - Stator of motor - Google Patents

Abstract

PURPOSE:To prevent generation of dust without cutting of an insulating wedge and to stably obtain a sufficient holding property without deteriorating insertion work of the insulating wedge. CONSTITUTION:An overhang 7 for preventing over-winding of coil 19 toward an external circumference side is integrally provided, at the position of an aperture of a slot 15, to an insulator 16 covering each teeth 12 of a teeth coupling portion 13. After a coil 19 is accommodated in each slot 15, a stator yoke 14 is inserted with pressure into the inserting portion 12a of the teeth 12 and an insulating wedge 20 is inserted between the stator yoke 14 and the overhang 15 in order to separate between the stator yoke 14 and the coil 19. In this case, an extension 18 for covering the internal circumference of the teeth 12 is also integrally provided to an insulator 16 extending up to the external circumference of the overhang 17 and the insulating wedge 20 is inserted so that both side edge portions are pressurized in contact with the overhang 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator of an electric motor in which an insulating wedge for separating a winding from a stator yoke is inserted into an opening of a slot of a tooth connecting body.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 5 and 6, a stator of an electric motor of this type has been provided. In this case, a synthetic resin insulator 3 is provided on a tooth connecting body 2 formed by connecting a plurality of teeth 1 (only two are shown in the drawing) at an inner peripheral portion thereof so as to cover the teeth 1. The winding 5 is housed in the slot 4 between the teeth 1.
After the winding 5 is wound, a ring-shaped stator yoke 6 that constitutes a stator core together with the tooth connecting body 2 is provided.
Is to be press-fitted and fixed to the press-fitting portion 1a at the outer peripheral end of each tooth 1 of the tooth connecting body 2.

In this case, the insulator 3 is given by, for example, insert molding or as a thin plate cover-shaped molded product which is divided into upper and lower parts. As shown in FIG. A flange-shaped projecting portion 3a is integrally provided at an outer peripheral end portion (opening portion of the slot 4) of the winding wire 5, whereby insulation between the winding wire 5 and the press-fitting portion 1a and outer circumference of the winding wire 5 are formed. It is designed to prevent it from protruding to the side.

After the stator yoke 6 is connected,
An insulating wedge 7 made of plastic is provided to separate the stator yoke 6 from the winding 5. As shown in FIG. 6, the insulating wedge 7 is in the form of a thin plate formed by two obtuse-angled folds extending in the vertical direction, and the inner peripheral surface of the stator yoke 6 and the insulator 3 are stretched. It is adapted to be inserted (press-fitted) in the thickness direction of the stator core between the projecting portion 3a.

[0005]

However, in the above-mentioned conventional one, since the insulating wedge 7 is inserted while pressing both side edges of the insulating wedge 7 against the inner side surface of the tooth 1 made of metal, the both side edges are formed by the teeth 1. There is a drawback in that dust and the like scraped off by a flash or the like may adversely affect the electric motor.

Further, the insulating wedge 7 is held in pressure contact with the inner side surface of the tooth 1 by the elastic force such that the fold of the insulating wedge 7 tends to widen. The holding force also varies, and there is a possibility that sufficient holding force may not be obtained. In this case, if the width of the insulating wedge 7 is simply formed to be sufficiently larger than the width between the teeth 1 in order to increase the holding force, this time, the press-fitting resistance at the time of insertion becomes too large and the insertion work is performed. However, there is a drawback that it becomes difficult.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an insulating wedge for isolating a stator yoke and a winding from each other. An object of the present invention is to provide a stator of an electric motor that can prevent the occurrence of the insulating wedge and can stably obtain a sufficient holding force thereof without deteriorating the workability of inserting the insulating wedge.

[0008]

A stator of an electric motor according to the present invention has a tooth connection in which a plurality of teeth are integrally connected at an inner peripheral portion thereof, and each of the teeth has a slot opened at an outer peripheral portion. A body, an insulator provided so as to cover the teeth of the tooth coupling body, and having an overhanging portion protruding from both sides so as to narrow the opening width of the outer peripheral opening of each slot; and the tooth coupling body Between the winding, which is housed in the slot, the stator yoke that is connected to the outer peripheral portion of the tooth connecting body to form a stator core together with the tooth connecting body, and between the stator yoke and the protruding portion of the insulator. An insulating wedge inserted in the thickness direction of the stator core, wherein the insulator is integrally formed with an extension portion located on the outer peripheral side of the overhanging portion and covering the inner surface of each tooth. Only have the characteristic of the insulating wedge, where the both side edge portions thereof are arranged so as to abut on the extension.

Further, in this case, if the contact surface of the extension portion with the insulating wedge is provided so as to gradually project from the both end portions in the thickness direction of the stator core toward the center side in the thickness direction, the teeth side may be further protruded. It is effective.

[0010]

According to the above-mentioned means, the insulating wedge is provided not in direct contact with the inner surface of the tooth, but in its both side edge parts in contact with the extension of the insulator which is softer than the tooth. Therefore, even when both side edges of the insulating wedge are inserted while being pressed against the extension, the insulating wedge is not scraped off. Since the insulating wedge is held by the elastic force of both the insulating wedge and the extension portion, a sufficient holding force can be stably obtained, and the press-fit resistance when inserting the insulating wedge is small. I can finish it.

Further, if the contact surface of the extension portion with the insulating wedge is provided so as to gradually project from the both ends in the thickness direction of the stator core toward the center side in the thickness direction, to the tooth side.
At the beginning of the work of inserting the insulating wedge, that is, at the end of the stator core in the thickness direction, the press-in resistance is small and it can be easily inserted with a light force. It becomes possible to obtain a stronger holding force.

[0012]

Embodiment An embodiment of the present invention (corresponding to claim 2) will be described below.
This will be described with reference to FIGS. 1 to 3. First, the overall structure of the stator of the electric motor according to the present embodiment will be briefly described with reference to FIG. The stator core 11 is composed of a tooth connecting body 13 having a plurality of teeth 12 and a ring-shaped stator yoke 14 that is press-fitted to the outer peripheral portion of the tooth connecting body 13. The tooth connecting body 13 and the stator yoke 14 are formed by stacking thin steel plates in the axial direction, for example.

The tooth connecting body 13 is formed in a shape in which a plurality of, for example, 16 teeth 12 arranged in a ring shape are integrally connected to each other by a thin bridging portion 13a at an inner peripheral portion thereof. . Slots 15 that open at the outer periphery are formed between the teeth 12. Also, each tooth 1
The outer peripheral end of 2 has press-fitting portions 12a extending to both sides in the circumferential direction.
Are formed.

In this case, in the present embodiment, among the 16 teeth 12, eight teeth located at every other one in the circumferential direction have a shape extending linearly in the radial direction, and the remaining eight teeth. The object has a shape extending in a direction inclined with respect to the radial direction, and the inclination directions thereof are alternately opposite to the circumferential direction. As a result, the shape of each slot 15 is changed depending on the winding mode (inner circumference side or outer circumference side) to be described later, such as one in which the inner circumference side is swollen in the circumferential direction or one in which the outer circumference side is swollen in the circumferential direction. Being different.

The tooth connecting body 13 is provided with an insulator 16 made of synthetic resin so as to cover each tooth 12. As shown in FIG. 1, the insulator 16 covers the surface of each tooth 12 excluding the press-fitting portion 12a and is continuous so as to also cover the outer peripheral surface portion of the bridging portion 13a. It is provided in. As a result, the tooth connecting body 13 has the inner peripheral surface portion and the stator yoke 14
The insulator 16 covers almost the entire surface except for the outer peripheral portion where is fitted.

As shown in FIG. 1, the insulator 16 is located at the inner peripheral side portion (opening portion of the slot 15) of the press-fitting portion 12a of each tooth 12 and has a brim-shaped tension. The protruding portion 17 is integrally provided, and with this, the protruding portion 17 is provided.
However, they are extended from both sides so as to narrow the opening width of the outer peripheral opening of each slot 15. Further, as will be described in detail later, the insulator 16 is integrally provided with an extension portion 18 located on the outer peripheral side of the protruding portion 17. The insulator 16 is formed, for example, by insert molding, or is provided as a thin plate cover-shaped molded product that is divided into two parts.

Although not shown in detail, a total of eight windings 19 (only part of which is shown) are wound around the tooth connecting body 13 on the inner and outer peripheral sides. This winding 19
Each slot 15 is wound so as to be housed in each slot 15 from the opening narrowed by the adjacent overhang 17. In the wound state of the winding 19, the coil side thereof is in a state of being surrounded by the insulator 16 except for the openings between the overhang portions 17.

At this time, the overhanging portion 17 serves to insulate the press-fitting portion 12a from the winding wire 19 and prevent the winding wire 19 from protruding to the outer peripheral side. Also,
Although detailed description is omitted, as described above, each slot 15
By making the shapes of the coils non-uniform, the space inside the slot 15 can be effectively used, and the length of the coil end portion of the winding wire 19 can be reduced and the space factor can be improved. It has become.

After the winding 19 is wound in this way,
The stator yoke 14 is press-fitted and fitted into the press-fitting portion 12a at the outer peripheral end of each tooth 12. At this time, the inner peripheral portion of the stator yoke 14 is provided beforehand with recesses 14a corresponding to the respective press-fitting portions 12a, and they are fitted and fixed by fitting them.

In the stator constructed as described above, in the portion facing the opening of each slot 15, between the inner peripheral surface of the stator yoke 14 and the overhanging portion 17 of the insulator 16. A plastic insulating wedge 20 for isolating the stator yoke 14 and the winding 19 from each other.
The stator core 11 is inserted and provided in the thickness direction.

As shown in FIGS. 1 and 2, the insulating wedge 20 has a vertically long thin plate shape having a length that penetrates the stator core 11 in the thickness direction and has two obtuse angles. By forming the fold extending in the vertical direction,
It is formed so as to form a generally arcuate shape that is gentle in the width direction as a whole. The folds allow elastic deformation in the width direction.

On the other hand, as shown in FIG.
The extension part 18 extends to the outer peripheral side of the overhang part 17, that is, the part between the press-fit part 12a and the insulating wedge 20 so as to cover the inner surface of each tooth 12.
Are provided integrally. Further, especially in this embodiment,
As shown in FIG. 2, the extension 18 is formed so that the thickness gradually increases from both ends (upper and lower ends) in the thickness direction of the stator core 11 toward the center side in the thickness direction.

Thus, the insulating wedge 20 is provided so that both side edge portions thereof come into contact with the extension portion 18, and the contact surface of the extension portion 18 with the insulating wedge 20 is made. The stator core 11 is provided so as to gradually protrude toward the center side in the thickness direction from both ends in the thickness direction (both upper and lower ends in the drawing) of the stator core 11 toward the opposite tooth 12 side.

Next, the operation of the above configuration will be described. The stator is configured by providing an insulator 16 on the tooth coupling body 12, winding a winding wire 19, and then fittingly fixing the stator yoke 14. Then, after the stator yoke 14 is fitted, the insulating wedge 20 is provided for each slot 15.

As shown in FIG. 2, the insulating wedge 20 is provided between the inner peripheral surface of the stator yoke 14 and the overhanging portion 17 of the insulator 16 in the thickness direction from, for example, the upper surface side of the stator core 11. At this time, both side edges of the insulating wedge 20 are inserted into the extension portion 18 of the insulator 16 which is soft and has elasticity.
Therefore, the side edge portion of the insulating wedge 20 is not scraped off, and the press-fit resistance at the time of inserting the insulating wedge 20 is small, so that the inserting work can be smoothly performed. Moreover, at the beginning of the work of inserting the insulating wedge 20, that is, at the upper end portion of the stator core 11, the extension portions 18 on both sides are
Since the width between 18 is wider than that on the center side, the press-fitting resistance is small and it can be easily inserted with a light force.

In the state in which the insulating wedge 20 is inserted, the folds are held in pressure contact between the teeth 12 by the elastic force of the expanding fold. At this time, the insulating wedge 20 is held. Since the insulating wedge 20 is held by the elastic forces of both the extension portion 18 and the extension portion 18, a sufficient holding force can be stably obtained. Moreover, in the central side portion of the stator core 11, the protruding portions of the extension portions 18 cause the extension portions 18 on both sides to
Since the width between 18 is narrow, a stronger holding force can be obtained when the insertion is completed.

As described above, according to this embodiment, the insulator 16
Since the extension portion 18 with which the side edge portion of the insulating wedge 20 abuts is integrally provided, the side edge portion of the insulating wedge 7 unlike the conventional case is not scraped off by the teeth 1, and the insulating wedge 20 is scraped off. It is possible to prevent the generation of dust due to the above, and it is possible to prevent the scraped dust and the like from adversely affecting the electric motor.

At the same time, the work of inserting the insulating wedge 20 can be smoothly performed with a light force, and a sufficient holding force of the insulating wedge 20 can be stably obtained.

Further, particularly in the present embodiment, the contact surface of the extension portion 18 with the insulating wedge 20 gradually protrudes from both ends in the thickness direction of the stator core 11 toward the center side in the thickness direction toward the anti-teeth 12 side. The insulating wedge 20
The initial insertion work of was further facilitated, and a stronger holding force of the insulating wedge 20 when the insertion was completed could be obtained.

FIG. 4 shows another embodiment of the present invention. The difference from the above embodiment is that the overhanging portion 2 of the insulator 21 is different.
2 is provided at the outer peripheral end portion (inner peripheral surface portion of the press-fitting portion 12a) of the extension portion 23 provided so as to extend to the outer peripheral side of 2.
A sandwiching wall portion 24 for sandwiching the insulating wedge 20 between the two is further provided integrally. According to this, by inserting the insulating wedge 20 so as to be fitted into the groove-shaped portion composed of the overhanging portion 22, the extension portion 23, and the sandwiching wall portion 24, in addition to the same effect as the above-described embodiment,
The holding force in the thickness direction of the insulating wedge 20 due to the holding force of the holding wall portion 24 can also be obtained.

In addition, the present invention is not limited to the embodiments described above and shown in the drawings. For example, the contact surface of the extension 18 with the insulating wedge 20 is provided flat in the thickness direction of the stator core 11. Even if it does so, the intended purpose can be achieved, and various modifications can be considered as the shape of the teeth of the tooth connecting body, etc., and various modifications can be made without departing from the scope of the invention. It is a thing.

[0032]

As is apparent from the above description, according to the stator of the electric motor of the present invention, an insulating wedge is provided in the insulator to separate the stator yoke from the winding. , The extension part located on the outer peripheral side of the overhanging part and covering the inner surface of each tooth is integrally provided, and the insulating wedge is provided so that both side edges contact the extending part, so that the insulating wedge is scraped off. Thus, it is possible to prevent the generation of dust due to the occurrence of dust, and it is possible to stably obtain a sufficient holding force without deteriorating the workability of inserting the insulating wedge.

Further, in this case, if the contact surface of the extension portion with the insulating wedge is provided so as to gradually project from the both ends in the thickness direction of the stator core toward the center side in the thickness direction, it is insulated. The wedge insertion workability and holding power are further excellent.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention and is an enlarged cross-sectional plan view of a main part.

FIG. 2 is a vertical sectional front view of a main part.

FIG. 3 is a plan view of the stator with a part of the winding wound.

FIG. 4 is a view corresponding to FIG. 1 showing another embodiment of the present invention.

FIG. 5 is a view corresponding to FIG. 1 showing a conventional example.

FIG. 6 is a view corresponding to FIG.

[Explanation of symbols]

In the drawings, 11 is a stator core, 12 is a tooth, 12a is a press-fitting portion, 13 is a tooth connecting body, 14 is a stator yoke, 15 is a slot, 16 and 21 are insulators, 17 and 22.
Is a projecting portion, 18 and 23 are extension portions, 19 is a winding wire, 20 is an insulating wedge, and 24 is a sandwiching wall portion.

Claims (2)

[Claims] 1. A tooth connecting body having a plurality of teeth integrally connected at an inner peripheral portion and having a slot open at an outer periphery between the respective teeth, and each tooth of the tooth connecting body is covered. And an insulator having bulges extending from both sides so as to narrow the opening width of the outer peripheral opening of each slot, a winding housed in the slot of the tooth coupling body, and the tooth coupling. A stator yoke that is connected to the outer peripheral portion of the body to form a stator core together with the tooth connecting body, and an insulating wedge that is inserted between the stator yoke and the protruding portion of the insulator in the thickness direction of the stator core. Wherein the insulating body is integrally provided with an extension portion located on the outer peripheral side of the overhanging portion and covering the inner surface of each tooth, and the insulating wedge has both side edge portions. The stator of the motor, characterized in that provided in the serial extension to abut. 2. The extension portion has a contact surface with the insulating wedge,
The stator of the electric motor according to claim 1, wherein the stator core is provided so as to gradually project from the both ends in the thickness direction of the stator core toward the center side in the thickness direction toward the opposite tooth side.