JPH08126231A - Electric motor stator - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to eliminate the gap at the joint between the tooth core and the yoke core and improve the performance of the motor. [Structure] In a stator for winding a tooth core 1 having a plurality of teeth radially provided on the outer periphery of a rotor hole and connecting the tooth core 1 with a yoke core 2 which is a separate body, The tooth core 1 and the yoke core 2 are punched simultaneously from the same substrate. Then, when the tooth core 1 and the yoke core 2 are punched out, the engaging projections 52a to 52 are attached to the tip end of the tooth core 1.
f are formed respectively. The engaging protrusions 52a to 52f
The engaging recesses 41a to 41f smaller than the engaging projections 52a to 52f are simultaneously punched in the yoke core 2 corresponding to intermediate positions of the punching positions, and the engaging projections 52a to 52f are formed in the engaging recesses 41a to 41f. Was pressed in.

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 particular, a tooth core having a plurality of teeth radially provided on the outer periphery of the rotor hole and a yoke core separate from the tooth core are provided. The present invention relates to a stator of an electric motor that connects a core portion of a core and a core portion of a yoke.

[0002]

2. Description of the Related Art Conventionally, a tooth core having a plurality of teeth radially provided on the outer periphery of a rotor hole and a yoke core separate from the tooth core are provided, and the tooth core is wound. A stator core that connects the tooth core and the yoke core after performing the above-mentioned is known. Then, when the tooth core and the yoke core are punched out at the same time, by forming the engaging projection on one side, the engaging recess corresponding to this engaging projection is formed at the same time. The engaging concave portion and the engaging convex portion are combined to form a stator core. However, although they are punched out with the same size, there are inconveniences such as the formation of a bond gap and insufficient bond strength due to burrs and sags due to shearing during punching.

For this reason, in the case where the stator core is punched out of the same material at the same time, a recess is formed in the yoke core, and a protrusion is formed in the tooth core so as to fit into this recess. A proposed technique is to rotate the tooth core and the yoke core in a direction in which the tooth core has a convex portion whose size is increased or decreased in order by a fixed ratio, and the yoke core has a concave portion larger than the convex portion. Yes (for example, Japanese Patent Laid-Open No.
-261026).

[Problems to be Solved by the Invention]

However, in the above-mentioned proposed technique, since the convex portion of the tooth core is smaller than the concave portion of the yoke core, there is a disadvantage in that a gap is generated there and the magnetic resistance becomes large and it becomes difficult for the magnetic flux to pass. As a result, the motor performance deteriorates. The problem arises that Further, mechanically, there is an inconvenience that the coupling strength between the tooth core and the yoke core is weakened. In order to eliminate such an inconvenience, it is necessary to manufacture the tooth core and the yoke core with different materials. Therefore, in the prior art, not only the material used is approximately doubled, but also the punching process is performed. Also has the inconvenience of being doubled.

An object of the present invention is to eliminate the gap at the joint between the tooth core and the yoke core and improve the motor performance.

[0006]

A stator of an electric motor according to claim 1 of the present invention comprises a tooth core having a plurality of teeth radially provided on the outer periphery of a rotor hole, and a tooth core separately from the tooth core. In the stator for connecting the tooth core and the yoke core after winding the tooth core, the tooth core and the yoke core are punched from the same substrate at the same time. When the tooth core and the yoke core are punched, engaging protrusions are respectively formed at the tip ends of the tooth cores and correspond to intermediate positions of the punching positions of the engaging protrusions. An engaging concave portion smaller than the engaging convex portion is punched out simultaneously in the yoke core, and the engaging convex portion is press-fitted into the engaging concave portion.

A stator of an electric motor according to claim 2 of the present application comprises a tooth core having a plurality of teeth radially provided on the outer periphery of a rotor hole, and a yoke core separate from the tooth core. After the winding of the tooth core, the stator connecting the tooth core and the yoke core, the tooth core and the yoke core are punched simultaneously from the same substrate, When punching out the tooth core and the yoke core, forming a recess for engagement at the tip of the tooth core,
An engaging convex portion larger than the engaging concave portion is simultaneously punched into the yoke core corresponding to an intermediate position between punching positions of the engaging concave portion, and the engaging concave portion is press-fitted into the engaging convex portion. Is characterized by.

[0008]

When the tooth core and the yoke core are punched out, the engaging projections are formed at the tips of the tooth cores, and the yoke portions correspond to the respective intermediate positions of the punching positions of the engaging projections. Since the engaging recesses smaller than the engaging projections are punched out at the same time in the iron core, and the engaging projections are press-fitted into the engaging recesses, it is possible to prevent a gap at the connecting portion between the tooth core and the yoke core. , Leakage magnetic flux is eliminated and motor performance is improved. In addition, since the convex part of the tooth core is larger than the concave part of the yoke core, these joints are press-fitted,
Since there is no gap there, the magnetic resistance becomes small. Then, the coupling strength between the tooth core and the yoke core increases.

Further, as in the second aspect, even when the positions where the concavities and convexities of the tooth core and the yoke core are formed are opposite to those of the first aspect, the same operation as in the first aspect can be achieved.

[0010]

An embodiment of the present invention will be described below with reference to the drawings. The members, arrangements, and the like described below do not limit the present invention and can be variously modified within the scope of the gist of the present invention.

1 to 4 show an embodiment of the invention according to claim 1, FIG. 1 is a plan view of a laminated tooth core and a laminated yoke core, and FIG. 2 is a tooth core. FIG. 3 is a plan view of the yoke cores simultaneously punched, FIG. 3 is a plan view of the yoke cores after punching, and FIG. 4 is a plan view of the tooth cores after punching.

The stator of the electric motor in this example has a tooth core 1, a yoke core 2, and a winding (not shown) as main components, and the tooth cores 1 are laminated to form a laminated tooth core 10. The yoke core 2 is formed by laminating the yoke cores 2
0 is formed, the laminated tooth core 10 is wound, and the laminated yoke core 20 is joined to the outer peripheral position of the wound laminated tooth core 10. Then, as shown in FIG. 2, the tooth core 1 and the yoke core 2 are simultaneously punched from a substrate 31 made of the same material by a press machine (not shown).

The tooth core 1 has a plurality of teeth (not shown) radially provided on the outer periphery of the rotor hole 1a, and the tip of the tooth core 1 has an engaging projection 11 ( In this example, 11a
6 to 11f) are respectively formed and punched. ,

The yoke core 2 forms the outer periphery of the stator and is formed in a hollow circular shape, and is punched simultaneously with the tooth core 1 as a separate body. Then, the punching position when the engaging convex portion 11 (11a to 11f) is punched out, that is, the engaging convex portion 11 (11a to 1f).
1f) at the position of the yoke core 2 corresponding to the middle of the recesses 21 (21a to 21f) formed at the same time, the engaging projection 11 is formed.
(21a to 11f) smaller engaging recesses 22 (22
a) to 22f) are punched out.

That is, the engaging projection 11 (11 of the tooth core 1)
The engaging recesses 22 (22a to 22f) are simultaneously punched out in the middle of the recesses 21 (21a to 21f) of the yoke core formed by punching out the a to 11f). The engaging recess 22 (22a to 22f)
Is formed to have a size smaller than that of the protrusion 11 (11a to 11f) of the tooth core 1. In this example, the shape of the engaging protrusion 11 and the shape of the engaging recess 22 are similar to each other.

The tooth core 1 and the yoke core 2 punched out from these substrates 31 are laminated together, and a winding (not shown) is applied to the laminated tooth core 10 thus laminated. Then, the laminated yoke portion iron core 20 is arranged and coupled to the outer periphery of the laminated tooth portion iron core 10.

At this time, the engaging projections 11 (1 of the tooth core 1)
1a to 11f) are coupled so as to coincide with the engaging recesses 22 (22a to 22f) formed in the yoke core 2 having a smaller size than the engaging protrusions 11 (11a to 11f). With this configuration, the engaging protrusion 11 (11
a to 11f) are recesses 22 (22a to 22) for engagement.
Since it is larger than f), the connection is a press-fit connection.

FIG. 5 shows an embodiment according to claim 2, and is a plan view when the tooth core and the yoke core are coupled.
This example shows an example in which the concave portion is provided on the tooth core and the convex portion is provided on the yoke core. In this example, the same components as those in the above embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In this example, when the tooth core 1 and the yoke core 2 are punched from the substrate 31, the engaging recess 41 is formed at the tip of the tooth core 1. For this reason, the tip end portion of the tooth core 1 is the wide portion 42, and the engaging recess 41 is formed in the wide portion 42. In addition, the yoke core 2
The engaging convex portion 5 for coupling with the engaging concave portion 41.
2 is formed toward the center, and this engaging convex portion 52
Is formed as a convex portion larger than the engaging concave portion 41. Note that reference numerals 51a to 51f denote engaging recesses 41 (4
1a to 41f) is a convex portion of the yoke core formed by punching.

Then, the engaging recess 41 (41 of the tooth core 1)
The engaging projections 52 (52a to 52f) are also punched at the same time in the middle of the projections 51 (51a to 51f) of the yoke core formed by punching out a to 41f). The engaging convex portion 52 (52a to 52f)
Is formed with a size larger than the engaging recess 41 (41a to 41f) of the tooth core 1. In this example, the engaging recess 4
The shape of 1 and the shape of the engaging convex portion 52 are formed similar to each other. Even if it is formed as described above, it is possible to obtain the same operational effect as that of the above-mentioned embodiment.

[0021]

As described above, according to the present invention, when the tooth core and the yoke core are punched from the same substrate at the same time to join the tooth core and the yoke core, the tooth core and the yoke core are joined together. The gap at the joint with the iron core can be prevented, the leakage flux is eliminated, and the motor performance is improved. Further, since the engaging convex portion of the tooth core is larger than the engaging concave portion of the yoke core, these couplings are press-fitted, and there is no gap there, so the magnetic resistance is reduced. Then, the bonding strength between the tooth core and the yoke core increases, which is of great practical value.

[Brief description of drawings]

FIG. 1 is a plan view of a laminated tooth portion core and a laminated yoke portion iron core according to claim 1 when they are coupled.

FIG. 2 is a plan view of a tooth core and a yoke core simultaneously punched.

FIG. 3 is a plan view of the yoke core after punching.

FIG. 4 is a plan view of a tooth core after punching.

FIG. 5 is a plan view when the tooth core and the yoke core according to claim 2 are coupled.

[Explanation of reference numerals] 1 tooth core 10 laminated tooth core 11a to 11f convex portion for engaging tooth core 2 yoke portion iron core 20 laminated yoke portion cores 21a to 21f concave portion of yoke portion 22a to 22f yoke portion core portion Combined recess 31 Substrate 41a to 41f Engagement recess of tooth core 51a to 51f Convex portion of yoke core 52a to 52f Engagement protrusion of yoke core

Claims (2)

[Claims] 1. A tooth core provided with a plurality of teeth radially provided on the outer periphery of a rotor hole, and a yoke core separate from the tooth core, and the tooth core is wound. After that, in the stator that connects the tooth core and the yoke core, the tooth core and the yoke core are punched from the same substrate at the same time, and when the tooth core and the yoke core are punched, Engaging protrusions are formed on the tip end portions of the tooth cores, and engaging recesses smaller than the engaging protrusions are formed in the yoke cores corresponding to intermediate positions of the punching positions of the engaging protrusions. A stator for an electric motor, characterized in that it is punched at the same time and the engaging projection is press-fitted into the engaging recess. 2. A tooth core provided with a plurality of teeth radially provided on the outer periphery of a rotor hole, and a yoke core separate from the tooth core, and the tooth core is wound. After that, in the stator that connects the tooth core and the yoke core, the tooth core and the yoke core are punched from the same substrate at the same time, and when the tooth core and the yoke core are punched, An engaging recess is formed at the tip of the tooth core, and an engaging projection larger than the engaging recess is punched simultaneously in the yoke core corresponding to an intermediate position between the punching positions of the engaging recess. A stator of an electric motor, characterized in that the engaging concave portion is press-fitted into the engaging convex portion.