JPH07170699A - Manufacturing stator core - Google Patents

Abstract

PURPOSE:To provide a stator core that is free from insufficient adhesive permeation, securely integrates stator laminations in a small motor which has no space for caulking, and generates no noise. CONSTITUTION:Thermosetting adhesive is applied to the whole surface of steel plates to constitute a laminations 13. Two or more laminations 13 are laminated vertically. The laminations 13 are pressed from the top and bottom while being heated, so that they are integrated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator core incorporated in a motor or the like.

[0002]

2. Description of the Related Art A stator used in a spindle motor or the like is, for example, as shown in FIGS. 4 and 5, a stator core b in which a plurality of laminations a ... Are laminated and integrated.
And a coil (not shown) wound around it.

Conventionally, the stator core b is formed by laminating a plurality of laminations a, and then partially crimped, for example, in the case of the 9-slot structure shown in FIG. 5, crimped every three tooth portions d. The portion e is formed and is configured by so-called pack caulking.

When such caulking cannot be performed, a plurality of laminations a ... Are laminated in the vertical direction, and then heat-cured on the outer peripheral surface c of each lamination a. By applying a conductive adhesive and heating it, the laminations a ... Are integrated to form the stator core b.

[0005]

However, recently, as motors have been downsized, it has become difficult to provide a crimped portion on the stator core. Therefore, pack crimping cannot be performed on a compact motor. There's a problem. On the other hand, even if the caulking is performed, the caulking portion is only a part of the entire stator core, so that the adhesion of each lamination is poor, and each lamination vibrates to generate noise during rotation.

Further, in the method of applying an adhesive to the outer peripheral surface of the stator core to integrate them, it becomes difficult to control the outer diameter dimension due to uneven application, and the interval between the stator core and the rotor magnet facing it is not constant. There is a risk of causing problems such as threads. In addition, the caulking strength is likely to decrease due to insufficient penetration of the adhesive (between the laminations).

The present invention has been made in view of the above problems, and an object of the present invention is to provide a small motor in which it is difficult to provide a caulking portion without fear of insufficient penetration of the adhesive. Even so, it is an object of the present invention to provide a stator core that can surely integrate the lamination of the stator and that does not generate noise.

[0008]

In order to achieve the above object, a method of manufacturing a stator core according to the present invention comprises applying a thermosetting adhesive to one surface of a steel sheet to form a lamination, and laminating a plurality of layers. It is characterized in that the laminations are laminated in a direction, pressure is applied to the laminated laminations from above and below to fix the laminations, and heat is applied to integrate the laminations.

[0009]

Since each lamination has an adhesive applied to and fixed on the entire surface, the adhesion strength is high, the laminations are reliably integrated, and noise due to vibration does not occur. Further, since there is no need for caulking, it is possible to manufacture regardless of the size of the stator core.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of a spindle motor embodying the present invention will be described with reference to FIGS. FIG. 3 shows the overall configuration of the spindle motor 1. A shaft member 2 provided at the center of the spindle motor 1, a bracket 3 that receives the lower end of the shaft member 2, a shaft member 2 and a bracket 3 On the other hand, a pair of bearing means 5 and 6 rotatably supporting the hub member 4, a stator 9 mounted on the bracket 3 and having a coil 8 wound around a stator core 7, and an auxiliary yoke 11 on the hub member 4. And a rotor magnet 12 attached via the.

The stator core 7 is composed of a plurality of laminated laminations 13, ... For the lamination 13, a flat and thin silicon steel plate is mainly used. Then, the one surface of the silicon steel sheet to which the thermosetting adhesive 14 has been applied in advance is punched out to form the lamination 13.

The lamination 13 thus made is
As shown in FIG. 2, a plurality of teeth 15 are arranged along the circumferential direction.
, And the coil 8 is wound around the tooth 15 of the stator core 7. Then, when a plurality of the laminations 13 are vertically laminated and heat is applied under pressure from above and below, the thermosetting adhesives interposed between the laminations 13 as shown in FIG. 14 is adhered and fixed over the entire surface between the laminations 13 ...
The stator core 12 is configured.

The thermosetting adhesive 14 does not have an adhesive force at room temperature, but has an adhesive force at a high temperature (for example, 75 to 150 ° C.). Therefore, lamination 1
It does not have an adhesive force at the time of punching or stacking of 3, and the function as an adhesive works only after heating.

Further, since the thermosetting adhesive 14 is made of a thermosetting resin, it does not soften by heating again, and the adhesive 1 is maintained even when the stator 9 or the like is in a high temperature state while driving the motor.
There is no possibility that 4 will flow out to the outside, it will not be in an uncured state, and the problem of outgas will not occur.

Although the specific example of the method for manufacturing the stator core according to the present invention has been described above, the present invention is not limited to this specific example, and various variations and modifications can be made without departing from the scope of the present invention. Is.

[0016]

According to the present invention, the lamination forming the stator core is formed by applying a thermosetting adhesive to a steel sheet in advance, and the lamination is performed by laminating, pressurizing and heating the lamination to obtain the stator core. Because
Since it is not necessary to apply an adhesive coating to each lamination, the working process can be simplified, and at the same time, since the adhesive is applied to one side of each lamination, the laminations can be firmly adhered and fixed. In addition, since it is not necessary to apply an adhesive to the outer circumference of the stator core, it is easy to control the outer diameter dimension, and there is no problem such as threading.

Further, since it is not necessary to integrate the laminations by crimping, it is not necessary to provide a portion for crimping the stator core, and even a small size can be easily manufactured.

[Brief description of drawings]

FIG. 1 is a partially enlarged sectional view of a stator core showing an embodiment of a method of manufacturing a stator core according to the present invention.

FIG. 2 is a plan view of the stator core of FIG.

FIG. 3 is a cross-sectional view showing a spindle motor of one embodiment.

FIG. 4 is a partial perspective view showing a conventional stator core.

5 is a plan view of the stator core of FIG. 4. FIG.

[Explanation of symbols]

 7 Stator core 8 Coil 9 Stator 13 Lamination 14 Thermosetting adhesive

Claims (1)

[Claims] 1. A method for manufacturing a stator core, comprising a plurality of laminated laminations, wherein a coil is wound, wherein a lamination is formed by applying a thermosetting adhesive to one surface of a steel plate. Is laminated in the up-down direction, and the laminated laminations are pressed from above and heated, and the laminations are integrated, thereby manufacturing the stator core.