JP5738228B2 - Laminated stator core, method for producing laminated stator core - Google Patents

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator stator core used in motors and generators, and a method of manufacturing a stator stator core, and more particularly to a structure of a core member of a stator stator core.

Conventionally, as a laminated stator core used for a commutator motor generally used in a vacuum cleaner or an electric tool, a stator core having a teeth portion facing the rotor core and a yoke portion connecting between the teeth portions has been used. .
Such a stator core is manufactured as a structure in which thin electromagnetic steel plates are punched out by a high-speed press and laminated in a mold.
In order to wind the coil around the laminated stator core manufactured in this way, a winding needle that pulls out the wire from the tip is placed in the hollow part of the laminated stator core, and this is rotated around the teeth part by driving the cam. Operate and wind the slots in the laminated stator core.

The core pieces constituting the rotor and the stator are simultaneously punched from one steel plate.
In the iron core member on the stator side, a steel plate is wasted in order to cut out a complicatedly shaped part such as a slot for storing a winding, and the unused portion was discarded.
Thus, for example, as shown in Patent Document 1, a method of dividing a laminated core of a stator and manufacturing a part of a part from a discarded part has been proposed.

JP-A-8-317579

In Patent Document 1, the yoke part of the stator is divided, and the yoke part is punched out from the area of the material that has been conventionally discarded, and the base part of the teeth is extended and assembled to obtain the stator, thereby saving the core member. I am trying.
However, as in Patent Document 1, if the iron core member is completely divided into six, there is a problem that a problem occurs in the accuracy and rigidity of the laminated stator iron core.

  The present invention has been made in order to solve the above-described problems, and an object of the present invention is to provide a laminated stator core having high material yield, low cost and high rigidity, and a method for manufacturing the same.

The laminated stator core according to this invention is
A pair of opposing laminated tooth portions;
In the laminated stator core comprising a pair of laminated connecting yoke parts that connect the opposite base ends of each laminated tooth part,
The core member of one layer constituting the laminated stator core is
A pair of opposing teeth and a pair of connecting yokes connecting the opposing teeth bases of each of the teeth, and a pair of connecting yokes integrally formed in an annular shape ;
An additional yoke portion that is added to the outer peripheral side of the connecting yoke portion so as to extend in the circumferential direction ;
The radial width of the pair of connecting yoke portions is smaller than the radial width of the teeth base end portions.

Moreover, the manufacturing method of the laminated stator core according to the present invention is as follows:
The additional yoke portion is cut out from the inside of the yoke portion of the electromagnetic steel plate from which the iron core member is cut.

The laminated stator core according to this invention is
A pair of opposing teeth and a pair of connecting yokes connecting the opposing teeth bases of each teeth, and a pair of connecting yokes integrally formed in an annular shape ;
An additional yoke part that is added so as to extend in the circumferential direction on the outer peripheral side of the connecting yoke part ,
Since the radial width of the pair of connecting yoke portions is smaller than the radial width of both teeth base end portions ,
A low-cost, high-performance laminated stator core with good productivity and economical materials can be obtained.

Moreover, the manufacturing method of the laminated stator core according to the present invention is as follows:
Because the additional yoke part is cut out from the inside of the yoke part of the electromagnetic steel sheet from which the iron core member is cut,
A low-cost, high-performance laminated stator core with good productivity and economical materials can be obtained.

It is a figure which shows the final assembly process of the lamination | stacking stator core which concerns on Embodiment 1 of this invention. It is a figure which shows the structure of the core member which comprises each lamination | stacking of the lamination | stacking stator core which concerns on Embodiment 1 of this invention. It is a figure which shows the steel plate layout of the iron core member which concerns on Embodiment 1 of this invention. It is a figure which shows the slot area | region where the coil of the lamination | stacking stator core which concerns on Embodiment 1 of this invention is arrange | positioned. It is sectional drawing after press-fitting the lamination | stacking stator core which concerns on Embodiment 1 of this invention to a cylindrical frame. It is a figure which shows the structure of the core member which comprises each lamination | stacking of the lamination | stacking stator core which concerns on Embodiment 2 of this invention. It is sectional drawing after press-fitting the lamination | stacking stator core which concerns on Embodiment 2 of this invention to a cylindrical frame. It is a figure which shows the structure of the core member which comprises each lamination | stacking of the lamination | stacking stator core which concerns on Embodiment 3 of this invention. It is sectional drawing after press-fitting the lamination | stacking stator core which concerns on Embodiment 3 of this invention to a cylindrical frame. It is a figure which shows the structure of the core member which comprises each lamination | stacking of the lamination | stacking stator core which concerns on Embodiment 4 of this invention. It is sectional drawing after press-fitting the lamination | stacking stator core which concerns on Embodiment 4 of this invention to a cylindrical flame | frame.

Embodiment 1 FIG.
Hereinafter, the laminated stator core and the manufacturing method thereof according to Embodiment 1 of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram illustrating a final assembly process of the laminated stator core 100.
The laminated stator core 100 is configured by laminating thin plate-like core members, and a laminated coupling yoke that couples a pair of opposed laminated tooth portions 1a and opposed base end portions K of each laminated tooth portion 1a. The laminated iron core 1 is composed of a portion 1b, and the laminated additional yoke portion 4 is press-fitted in the laminating direction on the outer peripheral side of the laminated connecting yoke portion 1b.
The laminated tooth portion 1 a protrudes inside the laminated iron core 1 and extends along the outer periphery of a columnar rotor (not shown) inserted inside the laminated iron core 1.

FIG. 2 (a) is a diagram showing the configuration of the iron core member that constitutes each lamination of the laminated stator core 100.
As shown in the figure, an additional yoke portion 41 is added to the outer peripheral side of a connecting yoke portion 32 that connects opposing teeth base end portions 33 of a pair of opposing teeth portions 31.
On the boundary surface of the connecting yoke portion 32 that connects the additional yoke portion 41 and the teeth base end portion 33, the concavo-convex portion 11 (a dovetail groove, a dovetail) that fits the iron core piece 3 and the additional yoke portion 41 is provided. Are provided, and both members are fixed by being press-fitted from the lamination direction of the laminated stator core 100.
When the cross-sectional area of the connecting yoke portion 32 is small, sufficient magnetic flux cannot be flowed, and the efficiency and output of the motor are reduced. However, by combining the cross-sectional areas of the connecting yoke portion 32 and the additional yoke portion 41, the conventional method It is designed to obtain a cross-sectional area equivalent to the yoke portion of the laminated stator core.

FIG. 2B is a diagram showing the layout of the respective members when the core piece 3 and the additional yoke portion 41 are simultaneously punched out from one strip-shaped electromagnetic steel plate by an iron core press.
The shape of the additional yoke portion 41 is set so that the additional yoke portion 41 can be manufactured using a magnetic steel sheet in a region in contact with the inside of the connecting yoke portion 32 (the center side of the core piece 3).
By arranging the outer shape of the additional yoke portion 41 to match the inner shape of the connecting yoke portion 32 and arranging them so as to be in contact with each other, it is possible to realize a mold layout with no waste and good yield.
The outer peripheral side of the slot opening 81 of the slot 8 around which the coil is wound has a shape after the additional yoke portion 41 is removed.

FIG. 3 is a view showing a steel plate layout of iron core members according to the present invention which are sequentially conveyed.
In the punching process, the core pieces 3 are punched by being arranged in the same direction from the same steel plate.
The iron core piece 3 and the additional yoke portion 41 punched from the steel plate in the mold are respectively laminated and caulked in a lower die blank portion (not shown), and the laminated iron core 1 and the laminated additional yoke portion 4 are formed separately.

The laminated cores 1 are connected in the mold by caulking portions 34.
Similarly, the stacked additional yoke portions 4 are connected by a caulking portion 44 in the mold.
The caulking portions 34 and 44 are partially cut out so that a part of the steel plate protrudes in a round shape, and the protrusions and the recesses of each other are fitted together to bond the steel plates between the layers.
Further, the shape of the caulking portions 34 and 44 may not be round, and may be combined with a half-cut protrusion so that the cross section is V-shaped.

The laminated additional yoke portion 4 taken out from the mold is press-fitted from the lamination direction of the electromagnetic steel plates and fixed to the outside of the laminated connecting yoke portion 1b of the laminated iron core 1 taken out from the same die.
The clearance of the press-fit portion can be arbitrarily determined by the shape design of the mold, and is determined so as to satisfy the fixing strength necessary for the motor.

FIG. 4A is a diagram showing a slot region in which the coil of the laminated stator core 100 is arranged.
FIG. 4B is a diagram showing a slot region when the additional yoke portion 41 is not cut out.
As shown in the figure, since the outside of the slot opening 81 of the slot 8 can be widened by using the additional yoke portion 41, the area of the slot 8 can be set larger than the area of the conventional slot. A conducting wire or a thicker conducting wire can be accommodated in the slot 8.

FIG. 5 is a cross-sectional view after the laminated stator core 100 is press-fitted into the cylindrical frame 7.
The additional yoke portion 41 is located inside the inner peripheral surface of the frame 7 and is disposed without interfering with the frame 7.
Further, the gap between the laminated stator core 100 and the frame 7 also functions as a cooling air passage.

According to the steel plate layout of the iron core member according to the present embodiment, since the additional yoke portion 41 is created from the inner region of the iron core piece 3, the electromagnetic steel plate is economical and the laminated stator core 100 is manufactured at low cost. can do.
Further, since the additional yoke portion 41 is cut out in the same direction as the connecting yoke portion 32 from the inner side of the connecting yoke portion 32 of the iron core piece 3, the magnetic properties of the steel plate are equal and smooth even when the two members are combined. A magnetic path can be formed.

Further, in the iron core member according to the present embodiment, the members constituting the yoke part are divided into two parts, that is, the connecting yoke part 32 and the additional yoke part 41. First, the laminated additional yoke part 4 is assembled and laminated. Whether it is wound after being integrated with the iron core 1 or when the laminated additional yoke portion 4 is attached to the laminated iron core 1 after winding, it can be wound around the laminated tooth portion 1a without greatly changing the conventional winding method, There is no need for new capital investment.
Further, since the laminated additional yoke portion 4 can be assembled by simply press-fitting into the laminated iron core 1 from the laminating direction, it is not necessary to use means such as welding, and an expensive assembling apparatus is not required.

The laminated stator core 100 is composed of two members, ie, the laminated core 1 and the laminated additional yoke portion 4, but the yoke portion is completely perpendicular to the direction in which the magnetic flux flows, as in the laminated core of Patent Document 1. There is no separated part, and thus the inner peripheral surface of the laminated tooth portion 1a can always maintain a certain accuracy and sufficient rigidity.
In addition, since the space of the slot 8 can be sufficiently secured, it is possible to wind many conductive wires around the laminated tooth portion 1a or to wind thick conductive wires.
Thus, a low-cost, high-performance laminated stator core 100 and a method for manufacturing the same can be obtained with good productivity and economical use materials.

Embodiment 2. FIG.
Hereinafter, the laminated stator core according to the second embodiment of the present invention and the method for manufacturing the same will be described with reference to the drawings, focusing on differences from the first embodiment.
Fig.6 (a) is a figure which shows the structure of the iron core member which comprises each lamination | stacking of the lamination | stacking stator core which concerns on this Embodiment.
FIG. 6B is a diagram showing a layout of each member when the core piece 3 and the additional yoke portion 241 are simultaneously punched out from one strip-shaped electromagnetic steel plate by an iron core press.
FIG. 7 is a cross-sectional view after the laminated stator core 200 is press-fitted into the cylindrical frame 7.
The iron core piece 3 is the same as that in the first embodiment.
The shape of the additional yoke portion 241 is different from that of the additional yoke portion 41 of the first embodiment.
The shape of the outer peripheral surface of the additional yoke portion 241 matches the shape of the inner peripheral surface of the frame 7, and the outer peripheral surface of the laminated stator core 200 is in contact with the inside of the frame 7 without a gap.
Thus, by matching the shape of the outer side of the additional yoke portion 241 with the axial sectional shape of the inner peripheral surface of the frame 7, the rigidity of the stator when integrated with the frame 7 is improved, and a motor with less vibration is obtained. Can be obtained.

Embodiment 3 FIG.
Hereinafter, the laminated stator core according to the third embodiment of the present invention and the method for manufacturing the same will be described with reference to the drawings, focusing on differences from the first and second embodiments.
FIG. 8 is a diagram showing the configuration of the iron core member that constitutes each lamination of the laminated stator core according to the present embodiment.
As shown in FIG. 8, the shape of the dividing surface 337 of the additional yoke portion 341 and the connecting yoke portion 332 cut out from the electromagnetic steel sheet is a curve that is convex toward the central portion of the iron core piece 303.
As a result, the surface of the additional yoke portion 341 that faces the connecting yoke portion 332 has a concave shape.

FIG. 9 is a cross-sectional view after press-fitting the laminated stator core 300 according to the present embodiment into the cylindrical frame 7.
When the additional yoke portion 341 having the shape as shown in FIG. 8 and the iron core piece 303 are combined, a gap 6 (ventilation recess) communicating in the laminating direction between the frame 7 and the laminated stator core outside the laminated additional yoke portion. Can be provided.

Since the central part of the connecting yoke part 332 is convex toward the center side of the laminated stator core, if it is too close to the rotor, the magnetic flux may flow from the convex part to the rotor side and the output may drop. It may also interfere with the winding needle during wiring.
Therefore, the shape of the convex portion is designed to such an extent that these problems do not occur.

  In this example, the central portion is convex on the inner peripheral side of the connecting yoke portion 332, but the area of the slot 8 around which the winding is wound is secured more than the conventional stator, and the entire yoke portion is The cross-sectional area can be secured equally, and the advantages of the first embodiment are also satisfied.

According to the laminated stator core and the manufacturing method thereof according to the present embodiment, a gap 6 serving as an air path can be secured between the frame 7 and the laminated stator core.
By letting the air flow through the air passage, other motor components such as a commutator and a brush (not shown) arranged on the leeward side of the laminated stator can be easily cooled.

Embodiment 4 FIG.
Hereinafter, the laminated stator core according to the fourth embodiment of the present invention and the method for manufacturing the same will be described with reference to the drawings, focusing on differences from the first to third embodiments.
Fig.10 (a) is a figure which shows the structure of the core member which comprises each lamination | stacking of a lamination | stacking stator core.
FIG. 10B is a diagram showing a layout of each member when the core piece 403 and the additional yoke portion 441 are simultaneously punched out from one strip-shaped electromagnetic steel plate by an iron core press.
As shown in FIGS. 10A and 10B, in the present embodiment, three uneven portions 411 for press-fitting the additional yoke portion 441 and the connecting yoke portion 432 are provided on the boundary surface between the two members. .

FIG. 11 is a cross-sectional view after press-fitting the laminated stator core 400 according to the present embodiment into the cylindrical frame 7.
As shown in FIG. 11, when the laminated stator core 400 is press-fitted into the frame 7, a force directed toward the inside of the laminated stator core 400 acts as a force for fixing the laminated stator core 400 from the contact portion with the frame 7. .
At this time, the connecting yoke portion 432 is compressed from both ends in the longitudinal direction toward the center. When the laminated connecting yoke portion is thin, the whole is buckled, and the laminated connecting yoke portion There is a risk that the center part is deformed inside the laminated stator core.
When the laminated connecting yoke portion is deformed, the fixing force with the frame 7 is weakened, and problems such as vibration of the motor occur.
Therefore, by providing a plurality of concave and convex portions 411 as shown in FIG. 11, the coupling force between the additional yoke portion 441 and the connecting yoke portion 432 can be strengthened, and a highly rigid laminated stator core 400 can be obtained.
As a result, the fixing force between the frame 7 and the laminated stator core 400 is also increased.

  It should be noted that the present invention can be freely combined with each other within the scope of the invention, and each embodiment can be appropriately modified or omitted.

100, 200, 300, 400 Laminated stator core, 1 laminated core,
1a Laminated teeth portion, 1b Laminated connecting yoke portion, 11,411 Uneven portion,
3,303,403 Iron core piece, 31 teeth part,
32, 332, 432 Connecting yoke part, 33 Teeth base end part, 34, 44 Caulking part, 337 Dividing surface, 4 Stacking additional yoke part,
41, 241, 341, 441 Additional yoke, 6 gap, 7 frame,
8 slots, 81 slot openings, K proximal end.

Claims (8)

A pair of opposing laminated tooth portions;
In the laminated stator core comprising a pair of laminated connecting yoke parts that connect the opposite base ends of each laminated tooth part,
The core member of one layer constituting the laminated stator core is
A pair of opposing teeth and a pair of connecting yokes connecting the opposing teeth bases of each of the teeth, and a pair of connecting yokes integrally formed in an annular shape ;
An additional yoke portion that is added to the outer peripheral side of the connecting yoke portion so as to extend in the circumferential direction ;
A laminated stator core having a radial width of the pair of connecting yoke portions smaller than a radial width of both teeth base end portions. 2. The laminated stator core according to claim 1, wherein a portion of the additional yoke portion corresponding to the outer circumferential surface of the laminated stator core is formed in a shape along an inner circumferential surface of a frame that houses the laminated stator core. . A portion of the additional yoke portion corresponding to the outer peripheral surface of the laminated stator core is configured with an air passage extending in the axial direction of the laminated stator core between the additional yoke portion and a frame housing the laminated stator core. The laminated stator core according to claim 1, wherein a recess for ventilation is formed. 4. The laminated additional yoke portion in which the additional yoke portions are laminated and the laminated connecting yoke portion are each fitted with a concavo-convex portion provided in the laminating direction of each outer peripheral surface. The laminated stator core described in 1. The laminated stator core according to claim 4, wherein the uneven portions are dovetail grooves and dovetails. The laminated stator core according to claim 4, wherein the laminated stator core has a plurality of the uneven portions. The method for manufacturing a laminated stator core according to any one of claims 1 to 6, wherein the additional yoke portion corresponds to an inner side of the connecting yoke portion of the electromagnetic steel sheet from which the iron core member is cut out. A method for manufacturing a laminated stator core cut out from a core. The portion to be outside the additional yoke portion is disposed so as to be in contact with the portion to be inside the connecting yoke portion, and the core piece and the additional yoke portion are cut out from the electromagnetic steel sheet. Manufacturing method of laminated stator core.

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