JPH0556590A - Stator of motor - Google Patents

Abstract

PURPOSE:To improve the quality of insulation of a coil and improve the assem bly property, too. CONSTITUTION:A stator core 15 is composed of an annular yoke 18 and many teeth 19 being made in separate bodies from this yoke 18. And coils 16 and 17 are wound on coupled bobbin bodies 22 and 23 in each of which two unit bobbin parts 24 are coupled by the other flange 24b. A groove is made at the coupling part which couples unit bobbin parts 24 so that it can be bent and deformed with the groove as a fulcrum. Press-fitting and fixing the locking projection of each tooth 19 in the locking groove 20 at the inside periphery of the yoke 18 after inserting each tooth 19 into the barrels of the coupled bobbins 22 and 23, a stator 13 will be completed.

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 a coil is mounted so as to straddle a plurality of teeth.

[0002]

2. Description of the Related Art Generally, in a stator of a conventional electric motor, as shown in FIG. 10, a large number of teeth 2 are provided on an inner circumference of an annular stator core 1 at equal intervals so that slots 3 are provided between the teeth 2. As shown in FIG. 12, a plurality of teeth 2 are formed on the coil 4 which is formed and wound beforehand as shown in FIG.
It is inserted in the slot 3 so as to straddle over.

[0003]

According to the above conventional configuration, when the coil 4 is inserted into the slot 3, the coil 4
The insulating coating is liable to be scratched by the edges of the teeth 2 and the like, and the insulating quality is likely to be deteriorated. Moreover, since the coils 4 are mounted so as to be overlapped with each other inside and outside, and the coils 4 inside and outside are in contact with each other, there is a possibility that a short circuit accident may occur between the coils 4 due to the above-described deterioration of insulation quality. Therefore,
At the time of inserting the coil 4, great care must be taken not to damage the insulating coating of the coil 4, and the work of inserting the coil 4 is extremely troublesome, which causes deterioration of the assemblability of the stator. ..

The present invention has been made in view of the above circumstances, and an object thereof is to provide a stator of an electric motor which can improve the insulation quality of the coil and the assemblability.

[0005]

A stator of an electric motor according to the present invention has a coil mounted so as to straddle a plurality of teeth, and is provided at both ends of a body fitted to each of the teeth. A connecting bobbin body having a form in which a plurality of unit bobbin portions each having a collar portion are coupled only between one of the collar portions,
The coil is characterized in that it is wound so as to straddle a plurality of body portions of the connecting bobbin body.

Further, it is more effective to form a bent portion that can be bent in the inner and outer peripheral directions at the connecting portion that connects the brim portions of the unit bobbin portion.

[0007]

According to the above means, the coil is mounted on the tooth while being wound around the connecting bobbin body. Therefore, when the coil is attached to the tooth, the edges of the coil and the tooth do not rub against each other, and scratches on the insulating coating of the coil are prevented. Also, the insulation between the inner and outer coils is improved.

Further, since the connecting bobbin body is constituted by connecting the unit bobbin portions fitted to the respective teeth on only one side, for example, the coil is wound so as to straddle a plurality of independent bobbins. The coil winding work can be performed more easily and the handling of the connecting bobbin body is easier because the connecting bobbin body is easily bent, so that the coil can be attached to the teeth more easily. be able to.

Further, if the bent portion is formed in the connecting portion for connecting the flange portions of the unit bobbin portion, the connecting bobbin body can be deformed more easily in the bending direction of the inner and outer circumferences. As a result, it is possible to further improve the assembling property such that the connecting bobbin body, and thus the coil, can be straightened during the winding operation of the coil and can be formed into an arc shape when mounted on the tooth.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. First, FIG. 6 shows an induction motor 11
In the induction motor 11, the stator 13 according to the present embodiment is arranged on the inner peripheral portion of the cylindrical frame 12, and the rotor 14 is placed in the field space of the stator 13. It is configured to be freely rotatable.

The stator 13 according to the present embodiment comprises a stator core 15 and coils 16 and 17 in two layers. The stator core 15 is composed of an annular yoke 18 (see FIG. 5) and, for example, eight teeth 19 (see FIG. 4). The teeth 19 have a substantially T-shape having an arc-shaped magnetic pole portion 19b at the tip of the coil winding portion 19a, and are formed separately from the yoke 18. The yoke 18 and the teeth 19 are fixed to each other by forming locking grooves 20 on the inner peripheral surface of the yoke 18 at equal intervals, and engaging grooves formed on the outer ends of the teeth 19 in the respective locking grooves 20. The stop projection 21 is press-fitted and fixed.

On the other hand, as shown in FIGS. 1 and 4, the coils 16 and 17 are connected bobbin bodies 22 and 2, respectively, which will be described later.
2 wound along the inner surface of the yoke 18
It is designed to be arranged in layers. In this case, the coil 16 on the outer peripheral side becomes the main winding, and the coil 17 on the inner peripheral side becomes the auxiliary winding. Each of these coils 16 and 17 is provided so as to straddle two adjacent teeth 19, and at this time, the outer peripheral side coil 16 and the inner peripheral side coil 17 are
The teeth 19 are attached in such a manner that they are offset by one.

Here, the connecting bobbin bodies 22 and 23 will be described in detail. As shown in FIGS. 2 and 3, the connecting bobbin body 22 includes two unit bobbin portions 24 in this case.
It has a shape integrally connected by 5. The unit bobbin portion 24 is configured to have the flange portions 24b at both ends on the outer peripheral side of the body portion 24a in the shape of a rectangular tube fitted into the coil winding portion 19a of the tooth 19. And the connecting portion 2
5 includes two unit bobbin portions 24 and a collar portion 24b on the outer peripheral side.
It is provided so as to be connected to each other. The coil 16 includes two body portions 24 of the connecting bobbin body 22.
It is wound so as to straddle between a and 24a.

In this case, the connecting bobbin body 22 is formed in an arc shape as a whole as shown in FIG. 2 by integrally molding plastic, for example, and has a certain degree of flexibility and flexibility. Further, in this embodiment, V-shaped groove portions 26 are formed on the outer peripheral surface of the connecting portion 25 at two left and right positions in this case. The connecting bobbin body 22 uses these two groove portions 26 as fulcrums,
It is easily bent in the inner and outer peripheral directions, and therefore the groove portion 26 functions as the bent portion according to the present invention.

The connecting bobbin body 23 on the inner peripheral side is shown in FIG.
Also, as shown in FIG. 4, the length dimension in the circumferential direction is smaller than that of the connecting bobbin body 22 on the outer peripheral side, and the two unit bobbin portions 24 are disposed between the inner peripheral flange portions 24b. The shape is such that they are connected at. Although not shown in detail, the connecting portion 25 also has a groove portion 2 that is a bent portion.
6 is formed.

Next, a procedure for assembling the stator 13 will be described. First, the coils 16 and 17 are wound around the connection bobbin bodies 22 and 23. As described above, the coil 16,
17 is wound so as to straddle the two body portions 24a, 24a, but as shown in FIG. 3, during this winding work, the arc-shaped connecting bobbin bodies 22, 23 are Try to do it in a substantially straight line. Further, at this time, the outer peripheral side portion of the coils 16 and 17 (the connecting portion 25
The coil 16 and 17 can be in a uniformly wound state when the coil 16 and 17 are mounted on the stator core 15 by loosely winding the inner side portion).

In this case, the four coils 1 on the outer peripheral side
6 is a magnet wire which is continuously wound and has both ends thereof provided with a terminal 2 provided on one connecting bobbin 22.
7, 27 (see FIGS. 1 and 6). Similarly, the four coils 17 on the inner peripheral side are also continuously wound by one magnet wire, and both ends thereof are connected to the terminals 28, 28.

After winding the coils 16 and 17 as described above, as shown in FIG. 4, the connecting bobbin body 23 on the inner peripheral side is arranged so as to straddle the two connecting bobbin bodies 22 on the outer peripheral side. Thus, the body portions 24a of the inner and outer unit bobbin portions 14 are brought into a matched state. Further, at this time, the outer peripheral side connecting bobbin body 22 is formed in an arc shape along the inner peripheral surface of the yoke 18, and the inner peripheral side connecting bobbin body 23 is formed into the connecting bobbin body 2.
It has an arc shape along the inner peripheral portion of 2.

In this state, the teeth 19 are inserted from the inner peripheral side into the hollow portion of the body portion 24a so that the locking projections 21 of the teeth 19 are projected from the connecting bobbin body 22.
Such work is performed for all the connecting bobbin bodies 22 and 23, and the connecting bobbin bodies 22 and 23 are assembled in a state of being arranged in an annular shape. In this case, two teeth 19 are inserted in each of the connected bobbin bodies 22 and 23.

In this way, all connected bobbin bodies 2
After temporarily assembling 2, 23 with the teeth 19, the assembly is fitted into the yoke 18, and the locking projections 21 of the teeth 19 are press-fitted into the locking grooves 20 of the yoke 18. The connecting bobbin bodies 22 and 23 are fixed to the inner circumference of the yoke 18 and the yoke 1 is provided via the teeth 19.
It is fixed to the inner circumference of 8, and the stator 13 is completed.

According to the above construction, the coils 16 and 17 are mounted on the teeth 19 while being wound around the connecting bobbin bodies 22 and 23, respectively. Therefore, unlike the conventional one shown in FIG. 12, when the coils 16 and 17 are attached to the teeth 19, the edges of the coils 16 and 17 do not rub against each other, and the insulating coating of the coils 16 and 17 is Prevents scratches. Further, due to the brim portions 24b of the connecting bobbin bodies 22 and 23, the insulation between the inner and outer coils 17 and 16 is improved, and thus the insulation quality can be significantly improved as compared with the conventional case.

Since the connecting bobbin bodies 22 and 23 are formed by connecting the unit bobbin portions 24 fitted to the teeth 19, for example, a coil is provided so as to straddle a plurality of independent bobbins. Coil 1 compared to the case of winding
The winding work of 6, 17 becomes easy. Also, with this,
Since the handling of the connecting bobbin bodies 22, 23 and thus the coils 16, 17 is simplified, the teeth 1 of the coils 16, 17 are
The work of attaching to 9 becomes easier.

Further, particularly in this embodiment, the unit bobbin unit 2
Since the groove portion 26 is formed in the connecting portion 25 that connects between the four flange portions 24b, the connecting bobbin bodies 22 and 23 can be easily deformed in the bending direction of the inner and outer circumferences. As a result, the connecting bobbin bodies 22, 23 and thus the coils 16, 17
It is possible to improve the assemblability by making the coil 16 and 17 straight while the coil 16 and 17 is being wound, and can be arcuate when the coil 16 and 17 are attached to the tooth 19.

7 to 9 show other different embodiments of the present invention. That is, in the above-described embodiment, the groove portion 26 serving as the bent portion is provided in the connecting portion 25 at two places on the left and right, but as shown in FIG. 7, the bent portion 31 is provided at one place in the central portion of the connecting portion 25. You may make it provide only. In addition, as shown in FIG.
You may make it provide the character-shaped protrusion part as the bending part 32. As shown in FIG.

In the above embodiment, the two unit bobbin portions 24 are connected to each other, but as shown in FIG.
As the connected bobbin body 33, three or more unit bobbin portions 3
The configuration may be such that four are connected. Further, in the above embodiment, the teeth 19 are formed separately one by one,
Although not shown, a plurality of teeth may be integrally formed by connecting the magnetic pole portions.

Besides, the present invention is not limited to the embodiments described above and shown in the drawings. For example, the coil may be wound over three or more unit bobbin portions. If the connecting portion has some flexibility, the bent portion 2
Various modifications are possible without departing from the gist of the invention, such as not necessarily providing 6.

[0027]

As is apparent from the above description, according to the stator of the electric motor of the present invention, one of the plurality of unit bobbin portions having the flange portions at both ends of the body portion fitted to each tooth is provided. Since the connecting bobbin body in the form of being connected only between the collar portions is provided and the coil is wound so as to straddle a plurality of body portions of the connecting bobbin body, the insulation quality of the coil can be improved. At the same time, it has an excellent effect that the assemblability can be improved.

If a bent portion that can be bent in the inner and outer peripheral directions is formed in the connecting portion that connects the brim portions of the unit bobbin portion,
The assemblability can be further improved.

[Brief description of drawings]

FIG. 1 is a plan view of a stator showing an embodiment of the present invention.

FIG. 2 is a plan view of a connected bobbin body.

FIG. 3 is a plan view of the connected bobbin body in a deformed state.

FIG. 4 is a plan view illustrating a procedure for assembling the stator.

FIG. 5 is a plan view of a yoke.

FIG. 6 is a vertical cross-sectional view of an electric motor

FIG. 7 is a plan view of a coil portion showing another embodiment of the present invention.

FIG. 8 is a plan view of a coil portion showing another embodiment of the present invention different from FIG.

FIG. 9 is a plan view of a coil portion showing another embodiment of the present invention different from FIGS. 7 and 8.

FIG. 10 is a plan view of a conventional stator core.

FIG. 11 is a front view of a conventional coil.

FIG. 12 is a plan view of a conventional stator.

[Explanation of symbols]

11 is an electric motor, 13 is a stator, 15 is a stator core,
Reference numerals 16 and 17 are coils, 18 is a yoke, 19 is teeth, 20 is a locking groove, 21 is a locking projection, 22 and 23 are connecting bobbin bodies, 24 is a unit bobbin section, 24a is a body section, 24
b is a collar portion, 25 is a connecting portion, 26 is a groove portion (bending portion), 31
Reference numerals 32 and 32 are bent portions, 33 is a connecting bobbin body, and 34 is a unit bobbin portion.

Claims (2)

[Claims] 1. A plurality of unit bobbin parts each having a coil mounted so as to straddle a plurality of teeth, and having a collar part at both ends of a body part fitted to each of the teeth. A connecting bobbin body in which only one of the collar portions is connected to each other, and the coil is wound over a plurality of body portions of the connecting bobbin body. The stator. 2. The stator of an electric motor according to claim 1, wherein a bending portion that can be bent in the inner and outer peripheral directions is formed in a connecting portion that connects the brim portions of the unit bobbin portion.