JPH0538086A - Motor - Google Patents

Abstract

PURPOSE:To improve workability when a stator coil is mounted on an inner- rotor type motor. CONSTITUTION:A tees part 6 is projected, while extending in the axial direction, from the inner peripheral part of a cylindrical stator core 5 and end plates 7, 8, having stop parts 9 at positions corresponding to the tees part 6, are disposed at the opposite end parts of the stator core 5. A prewound stator coil 10 is employed and locked at the locking parts 9 of the opposite end plates 7, 8 thus mounting the stator coil 10 on the tees part 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called inner rotor type motor in which a rotor is arranged inside a stator core.

[0002]

2. Description of the Related Art Conventionally, in this kind of inner rotor type motor, a plurality of teeth portions extending in the axial direction are provided on the inner peripheral portion of a stator core arranged so as to surround the rotor, and these teeth portions are provided. A stator coil is provided. Thus, regarding the provision of the stator coil on the tooth part, the coil is wound directly on the tooth part, or the coil in a pre-wound state is fitted into the tooth part from the open side of the slot between the tooth parts. The method is adopted.

[0003]

However, conventionally, a protruding portion for preventing the stator coil from being pulled out is provided at the tip of each tooth portion, and the opening portion of each slot is narrowed. For this reason, when the coil is wound directly on the tooth portion, the coil winding operation itself is difficult to perform, takes time, and requires a dedicated winding machine. It also had the drawback that it could not get many times.

On the other hand, even when the coil wound in advance is fitted into the tooth portion from the opening portion side of the slot, the opening portion of the slot is narrow, so that the coil is difficult to fit in the tooth portion and the coil is damaged. However, there is a drawback in that the number of turns of the coil cannot be increased.

The present invention has been made in view of the above circumstances, and an object thereof is to improve workability when mounting a stator coil on a tooth portion and to increase the number of windings of the coil. An object of the present invention is to provide a motor that can easily perform insulation treatment between a tooth portion and a stator coil and wiring between the stator coils.

[0006]

A motor of the present invention comprises a stator core having a plurality of teeth extending axially in an inner peripheral portion of the motor, the stator core being wound around the rotor in advance. A stator coil in a rotated state is mounted, and an end made of an insulating material having locking portions for locking the stator coil at portions corresponding to the teeth portions at both ends of the stator core. The feature is that the plate is provided.

In this case, it is preferable that the engaging portion of the end plate is formed in a shape larger than the end surface shape of the tooth portion,
At least one of the end plates may be a wiring board.

[0008]

According to the above-mentioned means, when the stator coil is mounted on the stator core, the stator coil in the pre-wound state is locked by the locking portions of the end plates arranged at both ends of the stator core. The stator coil can be fixed.

When the engaging portion of the end plate is formed in a shape larger than the end surface shape of the tooth portion, a gap is formed between the two when the stator coil is mounted on the tooth portion. Therefore, it is not necessary to perform a special insulation treatment between the two.

Further, when at least one of the end plates is composed of a wiring board, the lead wire of the stator coil can be processed on the wiring board, so that the wiring is simplified.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. First, in FIG. 2 and FIG. 3, the rotor 1 includes a rotating shaft 2, a yoke 3 arranged along the outer peripheral surface of the rotating shaft 2, and a magnet arranged along the outer peripheral surface of the yoke 3. 4 and.

On the other hand, on the outer circumference of the rotor 1, a cylindrical stator core 5 is arranged at a predetermined distance from the magnet 4. As shown in FIG. 1, a plurality of teeth portions 6, for example, six teeth portions 6 are formed on the inner peripheral portion of the stator core 5 so as to extend in the axial direction of the stator core 5, and
A concave slot 6a is formed between the tooth portions 6 and 6. In this case, each tooth portion 6 is formed in a simple prismatic shape.

At both upper and lower ends of the stator core 5,
Annular end plates 7 and 8 are provided. Of these, Figure 1
The lower end plate 7 in FIG. 2 is made of an insulating material such as polyamide resin (nylon), and the upper end plate 8 is paper impregnated with phenol or the like (paper phenol).
It is composed of a printed wiring board (PC board) in which the electrodes 8a are formed by pattern printing on a laminated body of.

Each of the end plates 7 and 8 has six locking portions 9 at portions corresponding to the teeth portion 6. As shown in FIG. 3, the width dimension X0 of each locking portion 9 is determined by the tooth portion 6 described above.
It is set slightly larger than the width dimension X1 of. Also,
These locking portions 9 have groove portions 9a, 9a at their tip portions, and have retaining portions 9b, 9 that are convex so as to project laterally.
It has b integrally.

A stator coil 10 is attached to each of the teeth portions 6 via end plates 7 and 8. As shown in FIG. 1, the stator coil 10 is fixed and formed by winding the self-bonding electric wires in an array and then melting the fusion layer, and before being attached to the teeth portion 6. It is in a pre-wound state. Reference numeral 10a denotes a lead wire of the stator coil 10, and as shown in FIG. 3, the inner diameter width dimension X2 of the stator coil 10 is set to be slightly smaller than the width dimension X3 between the retaining portions 9b and 9b. ing.

On the other hand, the outer peripheral surface of the stator core 5 is covered with a cylindrical case 11. The case 11 is divided into two case divided bodies 11a and 11b at a substantially central portion, and the stator core 5 is press-fitted into the inner surfaces of the case divided bodies 11a and 11b. In addition, the case division body 1
Bearings 12 and 12 are provided on 1a and 11b, respectively, and both ends of the rotary shaft 2 of the rotor 1 are supported by these bearings 12 and 12, so that the rotor 1 can rotate.

As shown in FIG. 1, the end plates 7 and 8 and the stator core 5 are provided with three holes 7a, 8b and 5a, respectively. As shown in FIG.
The both end plates 7 and 8 and the stator core 5 are fixed to the case division body 11a by screwing the screws 13 inserted through the holes a into the case division body 11a.

Thus, in the above structure, when the stator coil 10 is mounted on the stator core 5, the stator coil is wound in advance with the end plates 7 and 8 arranged at both ends of the stator core 5. The inner peripheral part of 10 is pushed into the corresponding locking parts 9 of both end plates 7, 8. Then, the locking portion 9
The retaining portion 9b is elastically deformed, so that the stator coil 10 is engaged with the engaging portions 9 and 9 of the both end plates 7 and 8 and is fitted into the tooth portion 6.

In this case, since the width dimension X3 of the retaining portion 9b of the locking portion 9 is set to be larger than the inner diameter width dimension X2 of the stator coil 10, the stator coil 10 is locked in the locking portion 9b.
The stator coil 10 is mounted in a detached state when locked to.

According to the above embodiment, the following effects can be obtained. That is, the stator coil 10 in the pre-wound state is locked to the locking portions 9 of the end plates 7 and 8 arranged at both ends of the stator core 5, so that the stator coil 10 can be attached to the teeth portion 6. Therefore, the work of mounting the stator coil 10 can be facilitated and the working time thereof can be shortened, resulting in cost reduction.

Further, since the locking portion 9 for locking the stator coil 10 is provided on the end plates 7 and 8, it is not necessary to provide a protrusion for preventing the teeth from being pulled out as in the conventional case. As a result, the tooth shape can be simplified.

Further, in this embodiment, since the winding is wound in advance to form the stator coil 10, the winding can be wound in an aligned manner. Therefore, when the coil width W of the stator coil 10 is set equal to that in the conventional case in which the winding is wound directly on the tooth portion, the number of windings of the winding can be increased as compared with the conventional case, and conversely, When the number of turns is set equal to that of the conventional one, the coil width W can be made smaller than that of the conventional one, so that the motor can be downsized.

Further, the engaging portions 9 of the both end plates 7 and 8 are set to be larger than the end surface shape of the tooth portion 6 so that a slight gap is formed between the stator coil 10 and the tooth portion 6. Therefore, there is an advantage that insulation treatment such as powder insulation treatment can be eliminated between the stator coil 10 and the tooth portion 6.

Furthermore, since the upper end plate 8 is composed of a printed wiring board, when connecting between the stator coils 10, the lead wire 10a of each stator coil 10 is connected to the electrode 8a of the end plate 8. Just do each stator coil 1
There is an advantage that processing of the lead wire 10a of 0 becomes simple.

In the above embodiment, the stator coil 10
Was formed by a self-bonding electric wire, but it may be formed by winding a magnet wire around a bobbin or the like.
Further, the end plates 7 and 8 may be provided with positioning projections so that the end plates 7 and 8 can be accurately positioned with respect to the stator core 5.

Besides, the present invention is not limited to the above-mentioned embodiments, but may be modified and carried out without departing from the scope of the invention.

[0027]

As is apparent from the above description, the motor of the present invention has the following excellent effects.

In the motor according to the first aspect, since the end plates made of an insulating material having the engaging portions for engaging the stator coil at the portions corresponding to the teeth portions are provided at both ends of the stator core, the winding is performed in advance. By locking the stator coil in the fixed state to the locking portion, the stator coil can be mounted on the teeth portion, and workability when mounting the stator coil can be improved.

Further, since the engaging portion for engaging the stator coil is provided on the end plate, the shape of the tooth portion can be simplified as compared with the conventional case in which the tooth portion is provided with a protrusion for preventing the teeth from being pulled out. Since the stator coil can be wound in advance, the winding can be wound in an aligned manner.

According to the motor of the second aspect, the engaging portion is formed in a shape larger than the end surface shape of the tooth portion, and in the state where the stator coil is attached to the tooth portion, the portion between the stator coil and the tooth portion is formed. Since a gap is formed in each of the teeth, it is possible to eliminate the need for special insulation treatment between the teeth and the stator coil.

According to the motor of the third aspect, since at least one of the end plates is composed of the wiring board, the lead wire of each stator coil can be processed on the wiring board. The wiring process can be easily performed.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of essential parts showing an embodiment of the present invention.

[Fig. 2] Overall vertical cross-sectional view

3 is a sectional view taken along the line AA of FIG.

[Explanation of symbols]

1 is a rotor, 5 is a stator core, 6 is a tooth portion, 7,
8 is an end plate, 9 is a locking part, and 10 is a stator coil.

Claims (3)

[Claims] 1. A stator core is provided which surrounds a rotor and has a plurality of teeth extending axially in an inner peripheral portion, and a stator coil in a pre-wound state is attached to the teeth. The motor is characterized in that end plates made of an insulating material having locking portions for locking the stator coil are provided at both ends of the stator core at portions corresponding to the teeth portions. . 2. The motor according to claim 1, wherein the engaging portion of the end plate is formed in a shape larger than the end surface shape of the tooth portion. 3. The motor according to claim 1, wherein at least one of the end plates is a wiring board.