JPH08182264A - Stator of motor and its manufacture - Google Patents

Abstract

PURPOSE: To provide the manufacturing method of a stator for which the coil of stator can be formed by winding from the outer side. CONSTITUTION: A conductor 16 is wound from the outside of a winding jig and fixed with an adhesive or the like and formed to a completed body 20 of a coil having a completed shape of stator. The winding jig is taken out, and stator segments 22 are assembled from the outside of the completed body 20 of the coil formed. The segment 22 has a base 22a and a projection 22b serving as a magnetic pole and is arranged in a circular shape around the completed body 20 of the coil. The whole is fixed with an adhesive so that the stator is completed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator manufacturing method for forming a rotating magnetic field in an electric motor, and a stator core suitable for this manufacturing method.

[0002]

2. Description of the Related Art A stator of an electric motor comprises a core made of a magnetic material and a coil for magnetizing the core. The core has a shape in which a plurality of magnetic poles extending in the direction of the cylinder axis are arranged in the inner circumferential direction on the inner surface of the cylinder. Further, a conducting wire is wound around this magnetic pole a predetermined number of times to form the coil. A rotating magnetic field is generated by passing an alternating current of a predetermined waveform through the conductor of this coil.

Conventionally, the stator core is made of a thin steel plate.
Punched into an annular shape with comb-shaped magnetic poles formed on the inner circumference,
A predetermined number of these were laminated to form the cylindrical shape. The coil is formed by winding the conductor between the magnetic poles provided on the inner surface of the cylinder, that is, by inserting a conducting wire into the slot from the inside. An example of such a stator is described in Japanese Utility Model Laid-Open No. 1-113572.

[0004]

As described above, in the conventional stator, when the conductor wire is wound around the core to form the coil, the conductor wire has to be inserted into the slot from the inner surface of the core. As for the shape of the slot, the inlet has the narrowest shape, and as described above, when inserting the conducting wire from the inside, there is a problem that the number of conducting wires that can be inserted simultaneously is limited and the winding time becomes long.

Further, the conductors cannot be aligned in the slots, the gap between the conductors increases, and the space factor, which is the ratio of the total cross-sectional area of the conductors inserted into the slots to the slot cross-sectional area, is low. was there.

There is also a problem that the conductor is damaged by the edge of the core when the conductor is inserted.

The present invention has been made in order to solve the above-mentioned problems, and is suitable for a method of manufacturing a stator that can efficiently wind a conductor wire without damaging it and has a high space factor, and a method of manufacturing the stator. It is intended to provide a stator.

[0008]

In order to achieve the above-mentioned object, a method of manufacturing a stator according to the present invention comprises winding a conducting wire from the outside on a jig having a predetermined shape to form a coil into a shape when the stator is completed. A step of molding a completed body, a step of removing the coil finished body from the jig, and inserting a core segment having one magnetic pole from the outside of the coil into each air core of the coil finished body, The method includes the steps of arranging the core divided pieces in a ring shape to form a stator core, and bonding the coil and the core divided pieces.

Further, the stator according to the present invention includes a core having a magnetic pole and a coil made of a conductive wire wound around the magnetic pole of the core, and each of the cores has one magnetic pole obtained by dividing the core in the circumferential direction. Is composed of a plurality of core divided pieces.

[0010]

The present invention has the above-mentioned structure, and since the conducting wire is wound on the jig from the outside to form the coil, the working efficiency is improved and the working time can be shortened.
Moreover, since the conducting wires can be aligned by winding from the outside, the space factor can be improved. In addition, it is possible to reduce the occurrence of scratches that occur when the conductive wire is wound.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a part of a winding jig 10 for winding a conductive wire into a shape when the coil is completed. Winding jig 1
0 is a ridge 12a extending around the cylinder in the cylinder axis direction.
And a V-shaped V-shaped member 14 inserted into the groove between the protrusions 12a. Therefore,
It can be seen that FIG. 1 shows a quarter of a cross section orthogonal to the axis of the winding jig 10. Further, the other portion 14b of the V-shaped member 14 matches the sectional shape of the coil when the stator is completed.

In the conventional coil of the stator, the conductor wire is wound from the inner side to the magnetic pole facing the inner side of the cylinder, but in the present embodiment, the winding can be performed from the outer side by using the jig. There is. That is, the conductor wire is not directly wound around the stator, but is wound around a jig that can be removed later, so that the conductor wire can be wound from the outside.

A conductive wire 16 is sequentially wound from the outside on the crotch portion 14b of the V-shaped member. A cross-sectional view of the winding jig 10 wound with the conductive wire 16 is shown in FIG. When the conductive wire 16 is wound from the outside, the conductive wires are sequentially wound from the outside of the already wound conductive wire, so that the conductive wires are easily aligned and a predetermined number of conductive wires can be wound in a smaller cross-sectional area. In addition, the shape of the crotch portion 14b of the V-shaped member is such that the inlet for inserting the conducting wire is open as shown in the figure,
The conductor wire 16 can be easily inserted. Further, in the conventional device, the edge of the magnetic pole may damage the conductive wire or the coating of the conductive wire. In the case of the present embodiment, however, the conductive wire and the coating are damaged by forming the corners of the V-shaped member into an arc shape. Can be prevented. That is, in the conventional device,
Since the shape of the magnetic pole directly affects the performance of the electric motor, the degree of freedom in designing the shape of this portion was small, but if it is a jig as in this example, the shape is determined regardless of the performance of the electric motor. can do. Therefore, as described above, the shape without edges can be obtained.

Further, the wound conductor 16 is pressed inward by the pressing head 18. This pressing operation can also be performed by winding the conductor wire from the outside on the winding jig. By this pressing operation, each conductor 16 having a circular cross-sectional shape is crushed, the voids are further reduced, and the space factor is improved.

Next, the gap between the conductive wires 16 is impregnated with an adhesive and the conductive wires 16 are fixed and molded into the shape of the completed coil to obtain a completed coil body. After the adhesive is dried, the trunk member 12 is pulled out in the axial direction, and further the V-shaped member 14 is pulled out toward the center in the radial direction. Then, the coil finished product 20 molded as shown in FIG. 3 is obtained.

Next, as shown in FIG. 4, the stator divided pieces 22 are assembled from the outside of the molded coil finished body 20 from the outside. The stator divided piece 22 forms a stator core when arranged in an annular shape, and has a base portion 22a which becomes a circular pipe portion when the core is formed, and a projection portion 22b which protrudes inward from the circular pipe portion to form a magnetic pole. As for the width of the base portion 22a and the protrusion portion 22b, as shown in the figure, the width of the protrusion portion 22b is narrow, and the difference portion is a slot in which a coil is arranged when the divided piece 22 is arranged in an annular shape. Becomes Then, the protrusions 22b serving as magnetic poles are sequentially inserted into the air core 23 of the completed coil body 20 and arranged in an annular shape. Also, the divided piece 2
In No. 2, a predetermined number of thin steel plates having the shape shown in the figure are laminated in a direction orthogonal to the paper surface. Therefore, when punching a thin steel plate into the shape of a divided piece, it is possible to perform a punching process with a smaller processing machine than that in the case of punching an annular stator shape, and it is possible to perform highly accurate machining. .

The side surfaces of the projections 22b of the divided pieces are formed substantially parallel to each other. When inserting from the outside, a shape with a widened tip is wasteful, so it is necessary to make them parallel or have a tapered shape. In the case of the present embodiment, by making them parallel, the magnetic poles (projections 22b) are formed. The magnetic reluctance is minimized.

As shown in FIG. 5, the stator core 24 is formed by arranging the divided pieces 22b in an annular shape around the molded coil body 20. At this time, the stator core 24 and the completed coil body 20 are preliminarily prepared to have a size such that a predetermined gap c is formed. An adhesive or a resin is poured into the gap c to integrally fix the divided pieces 22b arranged on the ring and the completed coil body 20. Then, this is housed in a circular tube-shaped case 26 to complete the stator.

Further, as described above, in this embodiment, high precision can be obtained in the punching process of the divided pieces. Generally, it is desirable to reduce the gap between the stator core and the rotor in the electric motor, but this requires high-precision machining. In the case of this embodiment,
Since the precision of punching can be improved, it is not necessary to perform cutting or grinding as post-processing in order to adjust the gap with the rotor, and the number of steps can be reduced. Further, since the divided pieces 22b can be processed with high accuracy, the gap between the divided pieces is small and the loss in this portion is also small.

Further, as shown in FIG.
When the thin steel plates 122-1 and 122-2 configuring the above are displaced from each other to form irregularities, the area of the facing surfaces can be increased, and therefore the magnetic resistance due to the gap between the divided pieces can be reduced. it can. Further, the adjacent divided pieces are meshed with each other and are more firmly coupled. Note that FIG.
In this case, the thin steel plates 122-1 and 122-2 are arranged so as to be shifted every other sheet, but the arrangement is not limited to this, and it is also possible to shift every several sheets. Also in this case, the area where the divided pieces face each other can be increased as compared with the case where the divided surface is a flat surface, and the magnetic resistance in this gap portion can be reduced.

[0022]

As described above, according to the present invention, the conducting wire is wound on the jig from the outside to form the coil, so that the working efficiency is improved and the working time can be shortened. Moreover, since the conducting wires can be aligned by winding from the outside, the space factor can be improved. In addition, it is possible to reduce the occurrence of scratches that occur when the conductive wire is wound.

[Brief description of drawings]

FIG. 1 is a view showing a jig used in an embodiment according to the present invention.

FIG. 2 is a view showing a state in which a conductor is wound around the jig shown in FIG. 1 to form a coil.

FIG. 3 is a view showing a state in which a jig is removed from the state shown in FIG. 2 and only a formed coil is used.

FIG. 4 is a view showing a state in which a stator segment is attached to the molded coil of FIG. 3 from the outside.

FIG. 5 is a view showing a state in which the divided pieces are arranged in an annular shape to form a stator core, and the stator is completed.

FIG. 6 is a diagram showing another embodiment according to the present invention.

[Explanation of symbols]

10 winding jig, 12 trunk member, 14 V-shaped member, 16
Conductor wire, 20 coil finished body, 22,122 stator divided piece, 24,124 stator.

Claims (2)

[Claims] 1. A method of manufacturing a stator for forming a rotating magnetic field of an electric motor, the method comprising winding a conducting wire from outside on a jig having a predetermined shape to form a completed coil body into a shape of a completed stator. A step of removing the coil completed body from the jig, and each core of the coil completed body, from the outside of the coil completed body, each insert a core split piece having one magnetic pole,
A method of manufacturing a stator, comprising: a step of arranging the core divided pieces in a ring shape to form a stator core; and a step of integrally bonding the ring-shaped divided pieces and the coil finished body together. 2. A stator of an electric motor, comprising: a core having magnetic poles; and a coil made of a conductive wire wound around the magnetic poles of the core, wherein each of the cores has one magnetic pole obtained by dividing the core in a circumferential direction. An electric motor stator comprising a plurality of core divided pieces.