JP3281083B2 - Motor stator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

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

In this case, the insulator 3 is provided, for example, by insert molding or as a molded product which is divided into upper and lower parts like a thin plate cover. As shown in FIG. A flange-shaped overhang 3a is integrally provided at an outer peripheral end portion (opening portion of the slot 4) of the winding 5 so as to provide insulation between the winding 5 and the press-fitting portion 1a and an outer periphery of the winding 5 Prevention of protrusion to the side is achieved.

After the stator yoke 6 is connected,
In order to isolate the stator yoke 6 and the winding 5, an insulating wedge 7 made of plastic is provided. As shown in FIG. 6, the insulating wedge 7 has a thin plate shape formed by extending two obtuse folds in the vertical direction, and the inner circumferential surface of the stator yoke 6 and the insulator 3 are stretched. The stator core is inserted (press-fitted) in the thickness direction of the stator core between the protruding portion 3a.

[0005]

However, in the above-mentioned conventional device, the insulating wedge 7 is inserted while the both side edges are pressed against the inner surface of the metal teeth 1, so that the both side edges are the teeth 1. There is a drawback that the dust or the like that has been scraped off by burrs or the like may have an adverse effect on the electric motor.

The insulating wedge 7 is pressed and held on the inner surface of the tooth 1 by an elastic force that causes the fold to expand. The holding force also varies, and there is a possibility that a sufficient holding force may not be obtained. In this case, if the width dimension of the insulating wedge 7 is simply made sufficiently larger than the width between the teeth 1 in order to increase the holding force, the press-fitting resistance at the time of insertion becomes too large, and the insertion work becomes difficult. Disadvantageously becomes difficult.

The present invention has been made in view of the above circumstances, and has as its object to provide an insulating wedge for isolating a stator yoke from a winding, and to remove dust caused by shaving off the insulating wedge. An object of the present invention is to provide an electric motor stator that can prevent generation of the wedge and can stably obtain a sufficient holding force without deteriorating the workability of inserting an insulating wedge.

[0008]

According to the present invention, there is provided a stator for an electric motor, in which a plurality of teeth are integrally connected at an inner peripheral portion, and teeth are connected between the respective teeth. An insulator provided to cover each of the teeth of the teeth-connected body, and having an overhang extending from both sides to reduce the opening width of the outer peripheral opening of each of the slots; and the teeth-connected body. And a stator yoke connected to the outer periphery of the toothed body and forming a stator core together with the toothed body, between the stator yoke and the overhanging portion of the insulator. An insulating wedge inserted in the thickness direction of the stator core, wherein the insulator is integrally provided with an extension portion located on the outer peripheral side of the overhang portion and covering the inner side surface of each of the teeth. Only the insulating wedge, and abuts against the both side edge portions thereof is the extension portion, and its outer surface is said scan
It is characterized in that it is provided so as to contact the inner peripheral surface of the data yoke .

In this case, it is preferable that the contact surface of the extension portion with the insulating wedge is provided so as to gradually protrude from the both ends in the thickness direction of the stator core toward the center in the thickness direction toward the anti-teeth side. It is effective.

[0010]

According to the above-mentioned means, the insulating wedge is provided not in direct contact with the inner side surface of the tooth, but with both side edges in contact with the extended portion of the insulator which is softer than the tooth. since it is, even if the side edge portions of the insulating wedge is inserted while pressed against the extension gets rid the insulating wedge is scraped off, moreover, the insulating Wexford
Ru can be finished reduce the press-in resistance at the time of insertion of di.
Then, the both side edge portions of the insulating wedge is held by the elastic force of both the insulating wedge and the extension portion, the insulating web
Since the outer surface side of the wedge comes into contact with the inner peripheral surface of the stator yoke , the insulating wedge is provided on both sides of the extension and the stay.
So that it is held in at least three places on the
Ri, Ru can be stably obtain a sufficient holding force.

[0011] Further, if the contact surface of the extension portion with the insulating wedge is provided so as to gradually protrude from the both ends in the thickness direction of the stator core toward the center in the thickness direction toward the anti-teeth side,
At the beginning of the insertion work of the insulating wedge, that is, at the end in the thickness direction of the stator core, the press-fitting resistance is small and the insertion can be easily performed with a light force. Thus, a stronger holding force can be obtained.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention (corresponding to claim 2)
Will be described with reference to FIGS. First, with reference to FIG. 3, the overall configuration of the stator of the electric motor according to the present embodiment will be briefly described. The stator core 11 includes a teeth connector 13 having a plurality of teeth 12, and a ring-shaped stator yoke 14 which is fitted to the outer periphery of the teeth connector 13 by press-fitting. The teeth connection body 13 and the stator yoke 14 are configured by, for example, laminating thin steel plates in the axial direction.

The teeth 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 by a thin bridging portion 13a at an inner peripheral portion thereof. . Slots 15 are formed between the teeth 12 and open at the outer periphery. In addition, each tooth 1
2 has a press-fit portion 12a extending on both sides in the circumferential direction.
Are formed.

In this case, in the present embodiment, among the 16 teeth 12, eight of the sixteen teeth 12 which are located every other in the circumferential direction form a shape extending linearly in the radial direction, and the remaining eight teeth 12 are formed. Has a shape extending in a direction inclined with respect to the radial direction, and the inclination direction is alternately opposite to the circumferential direction. With this, the shape of each slot 15 is changed according to the winding mode (whether the inner circumferential side or the outer circumferential side) described later, such as the inner circumferential side swelling in the circumferential direction or the outer circumferential side swelling in the circumferential direction. Have been different.

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

As shown in FIG. 1, the insulator 16 is provided with a flange-shaped tension member located at the inner peripheral portion (opening portion of the slot 15) immediately inside the press-fit portion 12a of each tooth 12. The projecting portion 17 is provided integrally, so that the projecting portion 17 is provided.
However, it protrudes from both sides so as to reduce the opening width of the outer peripheral opening of each slot 15. Further, as will be described later in detail, the insulator 16 is provided with an extended portion 18 at an outer peripheral side of the overhang portion 17 and integrally therewith. The insulator 16 is formed, for example, by insert molding, or is provided as a molded product divided into upper and lower portions in the form of a thin plate cover.

Although not shown in detail, a total of eight windings 19 (only some of which are shown) are wound around the teeth connecting body 13 on the inner peripheral side and the outer peripheral side. This winding 19
It is wound so as to be accommodated in each slot 15 from the opening narrowed by the adjacent overhanging portion 17. In the winding state of the winding 19, the coil side is surrounded by the insulator 16 except for the opening between the overhangs 17.

At this time, the overhanging portion 17 achieves insulation between the press-fit portion 12a and the winding 19, prevention of the winding 19 from protruding to the outer peripheral side, and the like. Also,
Although detailed description is omitted, as described above, each slot 15
, The space in the slot 15 can be effectively used, and the length of the winding 19 at the coil end portion can be shortened, and the space factor can be improved. It has become.

After the winding 19 is wound in this way,
The stator yoke 14 is adapted to be press-fitted into a press-fit portion 12a at the outer peripheral end of each tooth 12 and fitted. At this time, concave portions 14a are provided in advance on the inner peripheral portion of the stator yoke 14 in correspondence with the respective press-fit portions 12a, and are fitted and fixed by fitting them.

In the stator configured as described above, a portion between the inner peripheral surface of the stator yoke 14 and the projecting portion 17 of the insulator 16 at a portion facing the opening of each slot 15. In addition, a plastic insulating wedge 20 for isolating the stator yoke 14 and the winding 19 is provided.
It is provided so as to be inserted in the thickness direction of the stator core 11.

As shown in FIGS. 1 and 2, this insulating wedge 20 has a vertically long thin plate shape having a length penetrating through the stator core 11 in the thickness direction, and has two obtuse angles. The fold is formed to extend in the vertical direction,
As a whole, it is formed so as to form a gentle arc in the width direction. In this case, two insulating wedges 20
The crest is inserted with the crest side as the outer side, and the two creases
Is formed on the inner peripheral surface of the stator yoke 14.
It comes into contact (line contact). The fold allows elastic deformation in the width direction.

On the other hand, as shown in FIG.
The extension portion 18 extends to the outer peripheral side of the overhang portion 17, that is, a portion where the insulating wedge 20 is inserted between the extension portion 17 and the press-fit portion 12 a so as to cover the inner surface of each tooth 12.
Are provided integrally. Further, particularly in this embodiment,
As shown in FIG. 2, the extension portion 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 in the thickness direction.

With this arrangement, the insulating wedge 20 is provided so that both side edges thereof are in contact with the extension 18, and the contact surface of the extension 18 with the insulation wedge 20 is formed. The stator core 11 is provided so as to gradually project toward the center of the thickness direction from both ends (upper and lower ends in the drawing) of the stator core 11 toward the teeth 12.

Next, the operation of the above configuration will be described. The stator is configured such that an insulator 16 is provided on the teeth connecting body 13 , a winding 19 is wound thereon, and a stator yoke 14 is fitted and fixed. After the stator yoke 14 is fitted, an insulating wedge 20 is provided for each slot 15.

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

Then, when the insulating wedge 20 is inserted , the crests on the two folds on the outer surface thereof are formed.
Are in linear contact with the inner peripheral surface of the stator yoke 14.
At the same time, the folds are pressed and held between the teeth 12 by the elastic force which tends to spread. At this time, the elasticity of both the insulating wedge 20 and the extension portion 18 is increased. The insulating wedge 20 is held by force , and the insulating wedge 20 is
Since the stator yoke 14 is held at three places, a sufficient holding force can be stably obtained. Moreover, in the central part of the stator core 11,
The projecting portion of the extension 18 allows the extension 18
Since the width of the gap is narrow, a stronger holding force can be obtained when the insertion is completed.

As described above, according to the present embodiment, the insulator 16
Is provided integrally with the extension 18 to which the side edge of the insulating wedge 20 abuts, so that the side edge of the insulating wedge 7 is not cut off by the teeth 1 as in the conventional case, and the insulating wedge 20 is cut off. This can prevent the generation of dust caused by the dust, and can prevent the shaved 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, but a sufficient holding force of the insulating wedge 20 can be stably obtained.

Further, in this embodiment, in particular, the contact surfaces of the extension portions 18 with the insulating wedges 20 gradually project from the opposite ends in the thickness direction of the stator core 11 toward the center of the thickness direction toward the teeth 12. So that the insulating wedge 20
Thus, the initial insertion work becomes easier, and a stronger holding force of the insulating wedge 20 in a state where the insertion is completed can be obtained.

FIG. 4 shows another embodiment of the present invention. The difference from the above embodiment is that the overhang portion 2 of the insulator 21 is provided.
The extension portion 2 is provided on the outer peripheral end (the inner peripheral surface portion of the press-fitting portion 12a) of the extension portion 23 provided to extend to the outer peripheral side of the extension 2.
2 is provided with a holding wall portion 24 for holding the insulating wedge 20 therebetween. According to this, the insulating wedge 20 is inserted so as to be fitted into the groove-shaped portion formed by the overhang portion 22, the extension portion 23, and the holding wall portion 24, so that in addition to the same effects as in the above 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.

The present invention is not limited to the embodiment 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 in this way, the intended purpose can be achieved, and various modifications can be considered as the shape of the teeth of the tooth connected body, etc., and it can be appropriately changed and implemented without departing from the gist. Things.

[0032]

As is clear from the above description, according to the motor stator of the present invention, the insulating wedge for separating the stator yoke and the winding is provided. , provided an extension located on the outer peripheral side of the projecting portion covers the inner surfaces of the teeth together, the insulating wedge, and abuts against the both side edge portions thereof is the extension portion, and an outer
Since the surface side is provided so as to be in contact with the inner peripheral surface of the stator yoke, it is possible to prevent the generation of dust due to the shaving off of the insulating wedge, and to sufficiently reduce the insertion workability of the insulating wedge without deteriorating the workability. This has an excellent effect that a holding force can be stably obtained.

In this case, if the contact surface of the extension portion with the insulating wedge is provided so as to gradually protrude from the both ends in the thickness direction of the stator core toward the center in the thickness direction toward the anti-teeth side, the insulation can be achieved. It is more excellent in wedge insertion workability and holding force.

[Brief description of the 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 longitudinal sectional front view of a main part.

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

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

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

FIG. 6 is a diagram corresponding to FIG. 2;

[Explanation of symbols]

In the drawing, 11 is a stator core, 12 is a tooth, 12a is a press-fitting portion, 13 is a tooth connector, 14 is a stator yoke, 15 is a slot, 16, 21 is an insulator, 17, 22.
Denotes an overhang portion, 18 and 23 denote extension portions, 19 denotes a winding, 20 denotes an insulating wedge, and 24 denotes a holding wall portion.

Claims (2)

(57) [Claims] A plurality of teeth integrally connected at an inner peripheral portion thereof and having a slot opened at an outer periphery between each of the teeth; and covering each of the teeth of the teeth connected body. An insulator having projections extending from both sides so as to reduce the opening width of the outer peripheral opening of each slot, a winding accommodated in the slot of the tooth connector, and the tooth connector. A stator yoke that is connected to the outer peripheral portion of the body and forms a stator core together with the teeth connection body; and an insulating wedge inserted between the stator yoke and the overhanging portion of the insulator in a thickness direction of the stator core. In the insulator, the insulator, integrally provided with an extension portion that is located on the outer peripheral side of the overhang portion and covers the inner side surface of each of the teeth, and the insulating wedge has both side edges. Contact the serial extension and,
A stator for an electric motor, the outer surface of which is provided to abut against the inner peripheral surface of the stator yoke . 2. The extension portion has a contact surface with an insulating wedge,
The stator for an electric motor according to claim 1, wherein the stator is provided so as to gradually protrude toward the center of the stator in the thickness direction from both ends in the thickness direction of the stator core.