JP2816698B2 - Manufacturing method of laminated stator core - Google Patents

Description

The present invention relates to a method for manufacturing a laminated stator core used for a stator such as an induction motor, and more particularly to a method for manufacturing a stator yoke and a pole piece. The present invention relates to an improvement in a method of forming a laminated stator core by separately forming a laminated structure and then fitting and connecting them together.

(Prior Art) As is well known, a stator core of an induction motor or the like includes a stator yoke and a pole piece extending toward a central axis thereof.

Here, the winding is applied to the pole piece. However, since it is difficult to perform a winding operation in a state where the pole piece is integrated with the stator yoke, in recent years, the stator yoke and the pole piece are separately provided. A method has been practiced in which the magnetic pole pieces are wound around the magnetic pole pieces, and then the magnetic pole pieces are fitted and mounted on a stator yoke to be integrated. An example of a child core is shown.

FIG. 4 shows the structure of the stator core viewed from the top (however, the illustration of the winding is omitted). In the figure, reference numeral 1 denotes a stator yoke, 2 denotes a pole piece, and 3 denotes a stator yoke 1. The fitting portion 3 comprises a fitting recess 1 a provided on the stator yoke 1 and a fitting projection 2 a provided on the pole piece 2.

 Hereinafter, the manufacturing process of the stator core will be listed in order.

First, material removal is performed. That is, as shown in FIG. 4, the components of the stator yoke 1 and the components of the pole piece 2 are taken out of the iron core plate in a manner that their central axes are aligned. Here, the material removal is performed by punching using a press. At this time, while the fitting concave portion 1a and the fitting convex portion 2a forming the fitting portion 3 are formed by punching, the structure of the stator yoke 1 is formed. The part is separated from the constituent parts of the pole piece 2.

Components of stator yoke 1 from which material is removed and pole piece 2
The stator yoke 1 and the pole piece 2 are separately formed by laminating a plurality of the above components.

Next, the laminated pole pieces 2 are wound in a predetermined manner.

Thereafter, the magnetic pole piece 2 on which the winding is applied and the stator yoke 1 are integrally joined by fitting the fitting projection 2a and the fitting recess 1a to each other.

Through the above steps, a laminated stator core having the structure shown in FIG. 4 is completed.

By employing the manufacturing method as described above, the winding operation becomes extremely easy, and thus, the laminated stator core can be easily manufactured.

(Problems to be Solved by the Invention) In the above-described conventional manufacturing method, when the component part of the stator yoke 1 and the component part of the pole piece 2 are separated, the fitting concave portion 1a and the fitting convex portion 2a Is formed by punching, the fitting projection 2a is slightly larger than the fitting recess 1a.

That is, as shown in FIGS. 5 (a) and 5 (b), when the sheet material S is punched by the die D and the punch P, the sheet material S corresponds to the outer diameter Pa of the punch P as is well known. While the opening having the width Wa is formed, the blank material B is formed to have a width Wb obtained by adding the clearance 2c to the inner diameter Da of the die D, in other words, the outer diameter Pa of the punch P.

For this reason, as shown in FIG. 6, for example, the left-right width W2 of the fitting protrusion 2a is larger than the left-right width W1 of the fitting recess 1a, and the distance between the fitting recess 1a and the fitting protrusion 2a is increased. When the stator yoke 1 and the pole piece 2 are assembled, it is difficult to fit the fitting convex portion 2a into the fitting concave portion 1a, thereby causing a disadvantage that the working efficiency is significantly reduced. Was.

Also, when the stator yoke 1 and the pole piece 2 are integrated, the fitting projection 2a is larger than the fitting recess 1a,
Unreasonable concentration of stress occurs at the fitting portion between the stator yoke 1 and the pole piece 2, and as a result, a stress acting in the center direction of the pole piece 2 is generated as shown by an arrow F in FIG. As a result, there is a disadvantage that the inner diameter of the laminated stator core is distorted.

The present invention has been made in view of the above circumstances, and solves the above-described disadvantages that occur when the stator yoke and the pole piece are integrated.
An object of the present invention is to provide a method for manufacturing a laminated stator core, which can easily manufacture a stator having a stable quality.

[Configuration of the invention]

(Means for Solving the Problems) In the present invention, the stator yoke constituent part and the magnetic pole piece constituent part are separated from each other while forming a fitting projection on the magnetic pole piece constituent part by punching and forming the magnetic pole piece constituent part on the center axis. When rotated about a predetermined angle around the stator yoke, a fitting concave portion having a shape corresponding to the fitting convex portion is formed at a predetermined portion in the stator yoke component portion where the fitting convex portion is located, and mixing at the stator yoke is performed. The above object is achieved by fitting the fitting yoke of the pole piece into the recess and integrally connecting the stator yoke and the pole piece.

(Operation) In the above configuration, when the stator yoke and the magnetic pole piece are integrally connected, the fitting projection of the shape corresponding to the fitting recess is fitted into the fitting recess of the stator yoke. The work of assembling the stator yoke and the pole piece can be easily performed, and excessive concentration of stress at the fitting portion between the stator yoke and the pole piece can be suppressed, and the lamination can be continued. Inadvertent generation of stress on the stator core is prevented.

(Embodiment) Hereinafter, a method for manufacturing a laminated stator core according to the present invention will be described in detail with reference to FIGS. 1 to 3 showing an embodiment.

In this embodiment, a laminated stator core having the same appearance as that shown in FIG. 4 is manufactured according to the following procedures.

First, as shown in FIG. 1, slots O, O... Are punched out of an iron core plate by punching using a press, and material is removed for forming the components of the stator yoke 4 and the pole pieces 2. carry out.

At this time, the components of the stator yoke 4 and the pole pieces 2
Are punched out of the iron core plate in a manner that their central axes are aligned with each other, and while forming the fitting projection 5b on the component of the magnetic pole piece 2, the component of the stator yoke 4 and the magnetic pole piece are formed. 2
Is separated from the components.

In addition to the material removal of the components of the stator yoke 4 and the components of the pole piece 2, the fitting recesses 5a are formed in the components of the stator yoke 4 at the same time.

In the fitting recess 5a, the configuration of the stator yoke 4 is such that when the component of the pole piece 2 is rotated by a predetermined angle around the central axis, the fitting projection 5b of the component of the pole piece 2 is located. It is formed at a predetermined portion of the edge of the portion.

The fitting recess 5a is for fitting the stator yoke 4 and the pole piece 2 integrally with each other by fitting with the fitting projection 5b in a step described later. It is formed in a similar shape corresponding to the fitting projection 5b in the component.

That is, the fitting concave portion 5a is formed such that the fitting convex portion 5b punched when separating the component of the stator yoke 4 and the component of the magnetic pole piece 2 is slightly larger than the outer shape of the punch. In view of this, punching is performed using a punch formed to have the same dimensions as the opening of the die for punching the fitting projection 5b.

As a result, the fitting concave portion 5a has substantially the same shape corresponding to the fitting convex portion 5b. For example, as shown in FIG. The dimensions are substantially the same as the width B.

Further, the pole piece 2 of the embodiment has four poles (four poles), and the four fitting recesses 5a in the components of the stator yoke 4 have the same central axis as the fitting protrusion 5b. The fitting protrusion 5b
Are formed at positions rotated by 45 °.

Components of stator yoke 4 and pole piece 2 from which material has been removed
The stator yoke 4 and the pole piece 2 are separately formed by laminating a plurality of the above components.

Next, the laminated pole pieces 2 are wound in a predetermined manner.

After that, the fitting projection 5b of the magnetic pole piece 2 on which the winding is applied is
Is fitted into the fitting recess 5a of the stator yoke 4 to couple the pole piece 2 and the stator yoke 4 to each other. In other words, the fitting recess in the stator yoke 4
The stator yoke 4 and the pole piece 2 are connected to each other by inserting and fitting a ridge formed by stacking the fitting projections 5b on the pole piece 2 in the groove formed by integrating the pole pieces 5a. Combine and integrate with each other.

Through the above steps, a laminated stator core having the structure shown in FIG. 3 is completed. In FIG. 3, the illustration of the winding is omitted.

According to the above-described embodiment, the fitting portion 5a having a shape corresponding to the fitting convex portion 5b is provided in the component portion of the stator yoke 4 at the time of material removal, and the stator yoke 4 and the magnetic pole piece 2 are respectively formed by lamination. Are connected by a combination of the fitting concave portion 5a and the fitting convex portion 5b, so that the stator yoke 4 and the magnetic pole piece 2 can be smoothly integrated, and the stator yoke and the magnetic pole piece can be combined. Inadvertent backlash and concentration of stress in the fitting portion can be suppressed beforehand, and it is possible to prevent inadvertent deformation of the inner diameter shape of the laminated stator core.

In the above embodiment, the shape of the fitting projection 5b in the component part of the pole piece 2 is similar to the shape of the fitting recess 5a in the component part of the stator yoke 4. It is only necessary to realize a smooth and steady integration of the fitting projection 5b with the stator yoke 4, and the fitting projection 5b does not necessarily need to be formed in a shape completely similar to the shape of the fitting recess 5a.

The position of the fitting recess 5a depends on the stator yoke 4
In the configuration part, the fitting convex portion 5b and the central axis are the same, and the fitting convex portion 5b is set at a position rotated by a predetermined angle, and
The position is not limited to the intermediate position shown in the embodiment as long as it is between the parts where the constituent part of the stator yoke 4 and the constituent part of the pole piece 2 are separated.

Further, in the manufacturing method according to the present invention, as described above, the fitting concave portion in the component portion of the stator yoke is provided at a predetermined position of the edge portion in the component portion of the stator yoke, specifically, the component portion of the pole piece is centered on the central axis. Is formed at a position where the fitting protrusion is located when the fitting protrusion is rotated by a predetermined angle.

In other words, in the component part of the stator yoke, when the component part of the magnetic pole piece is rotated by a predetermined angle, a part where a fitting concave part of the magnetic pole piece is located where a fitting concave part is located, specifically, It goes without saying that the inner peripheral edge of the stator yoke is present.

For this reason, for example, even when the outer shape of the stator yoke has a rectangular shape and the number of magnetic poles in the pole piece is four, it is possible to form a fitting recess in a component part of the stator yoke, Thus, the production method according to the present invention,
It goes without saying that the present invention can be effectively applied to the production of laminated stator cores having various appearances irrespective of the outer shape of the stator yoke or the number of magnetic poles in the pole piece.

〔The invention's effect〕

As described above in detail, in the method for manufacturing a laminated stator core according to the present invention, when the stator yoke and the pole piece are integrally joined, the fitting recess in the stator yoke has a shape corresponding to the fitting recess. By fitting the fitting projections, the assembly work of the stator yoke and the pole pieces can be easily performed, and thus the production efficiency of the laminated stator core can be increased.

Furthermore, in the method for manufacturing a laminated stator core according to the present invention,
The stator yoke and the magnetic pole piece are connected by integrally fitting the stator yoke and the magnetic pole piece by fitting the fitting convex portion having a shape corresponding to the fitting concave portion into the fitting concave portion of the stator yoke. The concentration of unreasonable stress on the fitting portion is suppressed, and the occurrence of inadvertent stress on the laminated stator core is prevented in advance, and the inner diameter shape of the laminated stator core, that is, It is possible to obtain a product such as an induction motor having an extremely stable quality with a uniform air gap between the stator and the rotor.

[Brief description of the drawings]

FIG. 1 is a plan view showing an example of material removal employed in a method for manufacturing a laminated stator core according to the present invention. FIG. 2 is a plan view of a principal part conceptually showing a dimensional relationship between a fitting concave portion and a fitting convex portion in a stator yoke component part and a magnetic pole piece component part. FIG. 3 is an overall perspective view showing the appearance of a laminated stator core formed by the method for manufacturing a laminated stator core according to the present invention. FIG. 4 is a perspective view showing the laminated stator core formed by a conventional manufacturing method. The figure seen from above. FIGS. 5A and 5B are conceptual diagrams showing the cross-sectional shapes of a sheet material and a blank material during punching. FIG. 6 is a plan view of a principal part conceptually showing a fitting concave portion and a fitting convex portion of a laminated stator core formed by a conventional manufacturing method. 2 ... magnetic pole piece, 4 ... stator yoke, 5a ... fitting recess,
5b: Fitting projection.

Claims (1)

(57) [Claims] 1. A stator yoke component and a pole piece component are stamped and formed from an iron core plate with their central axes aligned with each other.
The stator yoke and the magnetic pole piece are separately formed by laminating a plurality of the stator yoke constituent parts and the magnetic pole piece constituent parts, and then the stator yoke and the magnetic pole pieces are fitted and connected to each other to form a stator. A method of manufacturing a laminated stator core for forming an iron core, wherein the stator yoke constituent part and the pole piece constituent part are separated from each other while punching and forming a fitting projection on the pole piece constituent part, and the magnetic pole piece When the component is rotated by a predetermined angle around the central axis, a fitting concave portion having a shape corresponding to the fitting convex portion is formed at a predetermined portion of the stator yoke component portion where the fitting convex portion is located. The stator stator yoke and the pole piece are integrally joined by fitting the fitting projection of the pole piece into the fitting recess of the stator yoke. How to make Law.