JP5380241B2 - Multilayer fixed core of rotating electrical machine - Google Patents

Description

  The present invention relates to a laminated type fixed iron core formed by laminating electromagnetic steel sheets used for rotating electrical machines and the like.

In recent years, a rotating electrical machine is required to be downsized and highly efficient, and a technique for winding a conductor at high density for each tooth is required.
In the integrated iron core device, it is necessary to leave a space through which the winding nozzle passes, which has been an obstacle to high-density winding. Therefore, by dividing the iron core for each tooth, the conductor can be wound with high density.
For example, in Patent Document 1, adjacent core blocks are connected so as to be rotatable, thereby avoiding interference between adjacent core blocks and nozzles during winding.
Each core sheet is provided with one dowel so that rotation between adjacent core blocks is possible.
Such an iron core device is required to have a high roundness at the tip on the inner peripheral side of the tooth in order to reduce torque pulsation of the rotating electrical machine. For this reason, a method is disclosed in which iron core pieces are punched from an electromagnetic steel sheet, laminated in the form as they are, and assembled after winding (for example, Patent Document 2). In this case, since the tip of the teeth can be punched with a circular punch, an iron core can be manufactured with high accuracy. Further, these iron cores have a plurality of core sheet shapes, and suppress the positional deviation in the rotation axis direction that occurs during assembly.
Patent Document 3 discloses a method of forming by cutting and bending a portion to be a split surface of a back yoke when punching out an iron core piece constituting a laminated fixed iron core from a single steel plate. A predetermined shape can be obtained by bending back the cut and bent portion.
On the other hand, as a technique for suppressing deformation of the core after assembly, as shown in Patent Document 4, a symmetrical tooth shape is shown. A core block having connecting recesses at both ends in the circumferential direction of the back yoke and a core block having connecting protrusions at both ends in the circumferential direction of the back yoke are alternately arranged in an annular shape, and the recesses and the protruding portions are fitted. Together, it constitutes a laminated fixed iron core.
By fitting and connecting the core blocks, the core blocks on both sides of each core block are constrained by the same fitting force. Can be assembled.

JP 2000-201458 A JP 2005-341684 A JP 2002-171725 A JP-A-8-205434

If the technique of Patent Document 4 is used, the shape of the laminated fixed iron core is stabilized, but each core block is wound after being assembled alone, and there is a problem that the work efficiency of the entire assembly process is poor.
Then, after connecting a plurality of core blocks using the techniques of Patent Documents 2 and 3, when winding the teeth, rotating each core block that has finished winding at the connecting portion to form an annular shape, It is indispensable to reduce the torque pulsation of the rotating electric machine to make the teeth inner peripheral portion of each block as close to a perfect circle as possible.
However, when punching a core piece with a punch, it is difficult to make the cut surface completely vertical, and the repulsive force generated between the joint surfaces of adjacent core blocks in the process of forming the core block into an annular shape is completely eliminated. I couldn't. This stress was applied as a moment load that tried to rotate each core block at each position, and this prevented the roundness of the inner periphery (tooth tip) of the fixed core from being secured.

  The present invention has been made in order to solve the above-described problems, and adopts a structure for connecting the core blocks to ensure workability during assembly and further to apply stress on the connecting portion to the adjacent core. It aims at providing the lamination | stacking fixed iron core of the rotary electric machine which can ensure the roundness of the internal peripheral surface of a lamination | stacking fixed iron core by disperse | distributing uniformly between blocks.

The laminated fixed iron core of the rotating electrical machine according to this invention is
A plurality of core blocks in which a plurality of core pieces each having a yoke portion and a teeth portion are laminated are connected,
In the laminated fixed iron core of the rotating electric machine configured to rotate in an annular manner by rotating the connecting portion of the adjacent core blocks,
The laminated fixed iron core is composed of two kinds of core pieces a and b.
Convex portions and concave portions provided on the lamination surface of the yoke portion of the core piece a, the convex portions and concave portions serving as the rotation center of the connecting portion, the teeth portion being arranged in the laminating direction of the core piece and the lamination fixing It is provided symmetrically with respect to the surface that bisects the core in the radial direction,
The core pieces a are composed of core pieces a stacked adjacent to each other on the same core block, or one upper layer or one lower core piece a of adjacent core blocks, and the convex portion is used as the concave portion. Inserting and configuring the connecting part,
The core piece b does not have a concave portion and a convex portion that connect adjacent core blocks of the laminated fixed iron core,
The core piece b is sandwiched between the core pieces a of the core blocks adjacent to the left and right of the core piece b.

The laminated fixed iron core of the rotating electrical machine according to this invention is
Convex parts and concave parts provided in the yoke part of the core piece constituting the connecting part, the convex part and concave part serving as the rotation center of the connecting part are the teeth part, the core piece laminating direction and the laminated fixed iron core radial direction The force applied from the split surface of the core block separates the tip on the inner peripheral side of the tooth portion from the rotating shaft of the rotating electrical machine. It works in the direction or the direction approaching the rotating shaft 6 of the rotating electrical machine. However, this amount of displacement is extremely small compared to the influence of the rotational moment of the conventional example, the roundness of the tip of the tooth portion can be improved, and a high-quality rotating electrical machine with reduced torque pulsation can be supplied. It becomes possible.

It is a perspective view in Embodiment 1 of the lamination | stacking fixed iron core of the rotary electric machine which concerns on this invention. It is a top view in Embodiment 1 of the lamination | stacking fixed iron core of the rotary electric machine which concerns on this invention. It is a top view in Embodiment 1 of the core piece which comprises the lamination | stacking fixed iron core of the rotary electric machine which concerns on this invention. It is principal part sectional drawing in Embodiment 1 of the core piece which comprises the lamination | stacking fixed iron core of the rotary electric machine which concerns on this invention. It is sectional drawing of the connection part in Embodiment 1 of the lamination | stacking fixed iron core of the rotary electric machine which concerns on this invention. It is a figure which shows the order which punches out the core pieces 2a and 2b in Embodiment 1 of the lamination | stacking fixed iron core of the rotary electric machine which concerns on this invention from an electromagnetic steel sheet. FIG. 3 is a cross-sectional view of the pushback mechanism in the first embodiment. It is a figure which shows the stress concerning the connection part of the conventional lamination | stacking fixed iron core. 5 is a diagram illustrating an example of a force acting on a convex portion of a core block according to Embodiment 1. FIG. FIG. 10 is another example of the force acting on the convex portion of the core block in the first embodiment.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view of a laminated fixed iron core 1 of a rotating electrical machine.
FIG. 2 is a plan view of the laminated fixed iron core 1.
FIG. 3 is a plan view of the core pieces 2a and 2b which are the smallest units constituting the laminated fixed iron core 1. FIG.
The laminated fixed iron core 1 is configured by alternately connecting an even number of two types of core blocks 3c and 3d obtained by laminating core pieces 2a and 2b in a predetermined order.
The difference between the core blocks 3c and 3d is only the stacking order of the core pieces 2a and 2b.
In the core block 3c, the core pieces 2a, 2a, 2b, 2b,... Are stacked in this order from the top layer, but in the core block 3d, the core pieces 2b, 2b, 2a, 2a,. ing.
In the figure, the core pieces 2a and 2b are stacked as a set of two, but the number is not limited to two.

The core blocks 3c and 3d include core block back yoke portions 31c and 31d that form the outer peripheral portion of the laminated fixed core 1, and a core block teeth portion 32c that extends from these back yoke portions toward the rotating shaft 6 of the rotating electrical machine. , 32d.
The core block teeth tip portions 33c and 33d, which are the tips of the core block teeth portions 32c and 32d, form a substantially circular arc centered on the rotating shaft 6 of the rotating electrical machine, and are generated by coils wound around the core block teeth portions 32c and 32d. It plays the role of transmitting the magnetic flux to the rotor.

The core piece 2a has a symmetrical shape with respect to a plane that bisects the tooth portion of the core piece 2a in the stacking direction of each core piece and in the radial direction of the stacked fixed core.
Moreover, the concave part for connecting each adjacent core block is provided in the both-ends surface of the yoke part of each core piece 2a, and the convex part is provided in the back surface.
On the other hand, the iron core piece 2b is not provided with an uneven portion for connection.
In the laminated fixed core 1 in which these iron core pieces are assembled, the dividing surface 23a of the iron core piece 2a contacts the dividing surface 22b of the adjacent iron core piece 2b, and the dividing surface 23b is separated from the dividing surface 22a of the adjacent iron core piece 2a. Abut.

FIG. 4 is a cross-sectional view of a main part of the core piece 2a.
FIG. 5 is a cross-sectional view in which the core block 3d and the core block 3c connected to both ends thereof are cut in the stacking direction at the connecting portion.
Concave and convex portions are provided on both sides of the yoke portion of the core piece 2a on the front and back sides. The concave portion 25 and the convex portion 26 have a circular cross section perpendicular to the stacking direction of the core pieces 2a, and the core blocks 3c and 3d can be connected by inserting the convex portion 26 into the concave portion 25. The core block can be rotated.
The diameter d1 of the concave portion 25 is set to be larger than the diameter d2 of the convex portion 26, and the adjacent adjacent core blocks can rotate smoothly and at the same time when the core blocks 3c and 3d are formed in an annular shape. There is a play that can finely adjust the interval between the core blocks.

The connected core blocks 3c and 3d are formed in an annular shape so that the divided surfaces 22a and 23b and 23a and 22b of the core pieces 2a and 2b constituting the adjacent core blocks come into contact with each other after the conductor is wound. The
Thus, the assembly error of the lamination direction of the lamination | stacking fixed iron core 1 can be reduced by using only two types of core pieces to be used.

Next, a specific manufacturing process of the laminated fixed iron core 1 will be described.
FIG. 6 is a diagram showing the order of punching the core pieces 2a and 2b from the electromagnetic steel sheet.
The core pieces 2a and 2b are subjected to the process of proceeding from the left to the right in FIG. 6 as necessary, and are simultaneously punched and laminated from the sheet-like electromagnetic steel sheet 40.
The hatched portion in FIG. 6 indicates a punch area.

First, in step 1, a part corresponding to the outer periphery of each core piece is punched out leaving a part.
Next, in step 2, the slot portion 41 is punched. The order of step 1 and step 2 may be reversed, or may be punched at the same time.
Next, either step 3 or step 4 is performed. This process is a process of cutting and bending the boundary portions 22a and 23b and 23a and 22b at the ends of the back yoke portions of the core pieces 2a and 2b.
The end part of the cut back yoke part is bent back by a pushback mechanism 8 shown in FIG. 7 provided in the same process. Instead of the pushback mechanism 8, another bending back process may be prepared.
The difference between Step 3 and Step 4 is that the positions of the core piece 2a and the core piece 2b are interchanged.
About the core sheet processed sequentially, only either one of the process 3 or the process 4 is performed alternately.
By doing so, if all the core pieces are laminated as they are after punching, it is possible to obtain a laminated fixed iron core in which the core pieces 2a and 2b are alternately laminated and connected.

Step 5 is a step applied only to the core sheet used for the lowermost layer of the core block.
Since there is no need for a convex portion at the bottom of the lowermost layer, piercing is performed on the portion corresponding to the concave portion 25.
Then, in the remaining core sheet, the convex portion 26 and the concave portion 25 having the cross section shown in FIG.
Thereafter, in step 7, the core piece teeth tip 21a, 21b is formed using a circular punch.
Finally, in step 8, the core pieces 2a and 2b are stacked while punching the outer periphery.
In addition, although each core piece is mutually fixed by caulking in the lamination direction, welding, adhesion | attachment, the process is abbreviate | omitted.

FIG. 8 shows a shape in which the dividing surface of the yoke portion of each core piece is not symmetrical with respect to the surface that bisects the teeth in the stacking direction and the radial direction of the stacking fixed iron core, and the individual cores. It is the figure showing the stress which acts on the connection part of two places of the conventional lamination | stacking fixed iron core which provided the convex part for connection only at the end of the one yoke part, and those resultant force.
In general, the split surface of the yoke portion of the cut electromagnetic steel sheet tends to swell due to a fractured surface in the cut surface during the cutting and bending process.
When the core block is formed into a ring shape, the original cut surfaces come into contact again, but each core piece extends slightly in the horizontal direction by the amount of swelling.
Thereby, each core piece receives a force in a direction away from each other when trying to form the original annular shape.

  As shown in FIG. 8, in the case of the conventional example, the stresses 50a and 50b acting on the connecting portion are loaded as a moment load 51 that rotates the core block. When this moment load 51 is applied, the entire core block is tilted in the direction of arrow 51 as shown in the figure, and the centers of curvature of the inner surfaces of the teeth of the laminated fixed core 1 are not all aligned. It causes the roundness of teeth to deteriorate.

Therefore, in the present embodiment, each core piece is configured as described above.
FIG. 9 is a diagram showing the force acting on the convex portion of the core block of the laminated fixed iron core 1 manufactured by the method described in the present embodiment. An equal force is applied to the left and right convex portions in the directions indicated by the arrows of the stresses 50c and 50d, and the resultant force is a force that pushes the core block toward the outer peripheral side. Similarly, a force to move the core block inward acts as a reaction force on the adjacent core block, but this force is sufficiently small, and the core block of the conventional laminated fixed core shown in FIG. Compared with the moment load 51 acting on the teeth, the roundness of the inner peripheral surface of the teeth is remarkably improved.

  As shown in FIG. 10, the dividing surface of the yoke portion is not symmetric with respect to the surface that bisects the teeth in the stacking direction and the radial direction of the stacked fixed core, but the configuration of the convex portion provided in the yoke portion is as follows. Even in a configuration such as the laminated fixed iron core 101 that is symmetrical, the moment to rotate the core block can be suppressed.

  As described above, according to the present invention, the force applied from the split surface of the core block is such that the core block teeth tip 33c is away from the rotating shaft 6 of the rotating electrical machine, and the core block teeth tip 33d is rotated by the rotating electrical machine. It works in the direction approaching the axis 6. However, this amount of displacement is much smaller than when the conventional moment load 51 is applied, and the roundness of the core block teeth tip portions 33c and 33d can be improved. Therefore, torque pulsation can be reduced, and a high-quality rotating electrical machine can be supplied.

1,101 laminated fixed core, 2a, 2b core piece,
21a, 21b Core piece teeth tip, 22a, 22b, 23a, 23b Dividing surface,
3c, 3d core block, 31c, 31d core block back yoke part,
32c, 32d core block teeth,
33c, 33d Core block teeth tip, 40 magnetic steel sheet, 41 slot,
50a, 50b, 50c, 50d Stress, 51 Moment load, 6 Rotating shaft,
8 Pushback mechanism.

Claims (4)

A plurality of core blocks in which a plurality of core pieces each having a yoke portion and a teeth portion are laminated are connected,
In the laminated fixed iron core of the rotating electric machine configured to rotate in an annular manner by rotating the connecting portion of the adjacent core blocks,
The laminated fixed iron core is composed of two kinds of core pieces a and b.
Convex portions and concave portions provided on the lamination surface of the yoke portion of the core piece a, the convex portions and concave portions serving as the rotation center of the connecting portion, the teeth portion being arranged in the laminating direction of the core piece and the lamination fixing It is provided symmetrically with respect to the surface that bisects the core in the radial direction,
The core pieces a are composed of core pieces a stacked adjacent to each other on the same core block, or one upper layer or one lower core piece a of adjacent core blocks, and the convex portion is used as the concave portion. Inserting and configuring the connecting part,
The core piece b does not have a concave portion and a convex portion that connect adjacent core blocks of the laminated fixed iron core,
A laminated fixed iron core of a rotating electrical machine sandwiched between the core pieces a of core blocks adjacent to the left and right of the core piece b. The laminated core for a rotating electric machine according to claim 1, wherein the core piece ( a) has a symmetrical shape with respect to the surface. All the core pieces constituting the laminated fixed iron core have a symmetrical shape with respect to a plane that bisects the tooth portion of each core piece in the lamination direction of the core pieces and in the radial direction of the laminated fixed iron core. The laminated fixed iron core of the rotating electrical machine according to claim 1, wherein The laminated fixed iron core according to any one of claims 1 to 3, wherein a split surface of a connecting portion of the core piece a and the core piece b is formed by cutting and bending.

Images