JP2002058187A - Laminated core and rotating electric machine using the same - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To prevent disturbance of magnetic flux and increase of core cogging torque. An armature core of a DC motor is provided.
Is constituted by a laminated core in which a plurality of core veneers 20 are laminated and overlapped with each other. A plurality of outer fitting portions 25 and inner fitting portions 26 are annularly arranged and formed on the annular inner peripheral edge of each core veneer 20, and each of the core veneers 20, 20 overlapping each other. Inward surface 25 of outer fitting piece 25
a and the outward surface 27a of the fitting portion 27 of the inner fitting piece 26 are pressed against each other and fitted around the entire circumference. Since the magnetic flux Φ of the stator 11 does not pass through the contact surfaces 25a and 27a between the outer fitting portion 25 and the inner fitting portion 26, the magnetic flux Φ is disturbed by the pressing surfaces 25a and 27a. Can be avoided and the core cogging torque can be prevented from increasing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a laminated core,
In particular, the present invention relates to a technique of laminating a plurality of core single plates made of a thin magnetic material such as a silicon steel plate and joining them together, and is effective for a rotor core or a stator core of a rotating electric machine such as a motor or a generator. About.

[0002]

2. Description of the Related Art Generally, an armature (rotor) of a DC motor has an armature shaft press-fitted into a shaft hole of an armature core (rotor core) in which a plurality of salient poles (teeth) are formed radially, and a coil wire material is inserted into each salient pole. Are wound. As the armature core, a laminated core in which a plurality of core single plates made of a silicon steel plate which is a magnetic thin plate are laminated and bonded to each other is widely used.

As a conventional method of manufacturing a laminated core of this type, a single veneer core is punched out of a rolled silicon steel sheet by press working, and is stacked on the previously punched core single plate and pressed. A method of sequentially laminating and integrating by fitting a concave portion and a convex portion of each other,
(For example, see Japanese Patent Application Laid-Open No. 3-174927). In addition, it is general that the concavo-convex portion connecting the core single plates is formed between the bottom of the salient pole of the laminated core and the shaft hole.

[0004]

However, in the laminated core manufactured by the above-described manufacturing method, an uneven portion connecting the core single plates is formed between the bottom of the salient pole of the laminated core and the shaft hole. Therefore, when used in an armature core of a DC motor, the uneven portion is interposed in the path of the magnetic flux of the field pole, so that the magnetic flux is disturbed by the uneven portion, so that core cogging occurs. There is a problem that torque increases. Incidentally, there is a similar problem not only in the case of the armature core but also in the case of the stator core.

An object of the present invention is to provide a laminated core capable of preventing disturbance of magnetic flux and a rotating electric machine using the same.

[0006]

A laminated core according to the present invention is a laminated core in which a plurality of core veneers are laminated and mutually overlapping core veneers are joined together. The outer fitting portion and the inner fitting portion are formed in an annular shape at the peripheral edge of the outer fitting portion and the inner fitting portion of the core veneers overlapping each other are fitted around the entire periphery. It is characterized by being.

For example, when the above-described laminated core is used for an armature core of a DC motor, an outer fitting portion and an inner fitting portion for connecting the core veneers overlapping each other are formed of the core veneer. Since the magnetic flux of the stator does not pass through the joint between the outer fitting portion and the inner fitting portion by being arranged on the annular inner peripheral edge, a phenomenon that the magnetic flux is disturbed by the joining portion is prevented. This can be avoided, and as a result, the core cogging torque can be prevented from increasing.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

In the present embodiment, the laminated core according to the present invention is configured as an armature core of the DC motor shown in FIG. DC motor 10 shown in FIG.
Is provided with a four-pole stator 11 and a twelve-pole salient-pole armature 14. The stator 11 is configured such that four magnets 13 forming field poles are fixed at equal intervals in a circumferential direction on an inner peripheral surface of a housing 12 formed in a cylindrical shape. The armature 14 includes a coil wire 15, an armature shaft 16, and an armature core 17. The coil wire 15 is wound around twelve salient poles 18 of the armature core 17, and the armature shaft 16 is inserted into a shaft hole 19 of the armature core 17. It is press-fitted and configured. The armature 14 is concentrically disposed on the center line of the stator 11 and is rotatably supported. The armature 14 has a magnetic field flux of the four magnets 13 of the stator 11 and a magnetic flux generated by the coil wire 15 of each salient pole 18 of the armature 14. Are rotated by suction and repulsion.

The armature core 17 is constituted by a laminated core in which a plurality of core single plates 20 shown in FIG. 2 are laminated and connected to each other. That is, this armature core 17 is formed by pressing a core veneer from a rolled silicon steel plate by pressing, and stacking and pressing the core veneer on the previously punched core veneer to form the concave and convex portions of each other. Are laminated cores manufactured by a manufacturing method in which they are joined to each other by fitting. However, in the armature core 17 according to the present embodiment, the concavo-convex portion connecting the single core plates is formed at the opening edge of the shaft hole of the armature core.

That is, as shown in FIG. 2, a core single plate 20 punched and formed from a silicon steel plate by pressing is provided with a circular ring-shaped main body 21.
The salient poles 18 of the armature core 17 are provided on the outer periphery of the main body 21.
T-shaped salient pole portions 22 corresponding to the above are radially protruded and arranged at equal intervals in the circumferential direction, and a shaft corresponding to the shaft hole 19 of the armature core 17 is formed on the inner periphery of the main body portion 21. A hole 23 is provided. Twelve shaft press-fitting pieces 24 as fixing portions are arranged at equal intervals in the circumferential direction and protrude radially inward from the inner peripheral edge of the shaft hole 23. Reference numeral 24 denotes each salient pole portion 22 with the main body portion 21 interposed therebetween.
Are opposed to each other. Adjacent shaft press-fitting pieces 2
Core veneer 2 overlapping each between 4 and 24
An outer fitting portion 25 as an outer fitting portion and an inner fitting portion 26 as an inner fitting portion are arranged alternately so as to substantially form a concave-convex portion connecting the 0 and 20 with each other. It protrudes inward in the radial direction.

A fitting portion 27 is formed at the distal end of the inner fitting portion 26 by bending the distal end portion itself in the axial direction. The outward surface 27a of the fitting portion 27 Inward surface 25 of outer fitting piece 25 of plate 20
a. That is, FIG.
, The distance from the center O of the core veneer 20 to the inward surface 25a of the outer fitting portion 25 is d ₁ , the distance from the inward surface of the inner fitting portion 26 to d ₂ is d ₂ , Assuming that the distance to the outward surface 27a of the joint 27 is d ₃ and the distance to the shaft press-fitting piece 24 is d ₄ , each of the distances d _{1 to} d ₄ is d ₄ <
It is set so as to satisfy the relationship of d ₂ <d ₁ <d ₃ . The inward surface 25a of the outer fitting portion 25 is formed in a concentric arc shape over the entire circumferential width between the adjacent shaft press-fitting portions 24.

Next, the core veneer 2 constructed as described above
The method of manufacturing the armature core 17 according to the above configuration using the “0” will be described.

As shown in FIG. 4A, a core veneer (hereinafter referred to as a lower veneer) 20L previously punched out.
When a core veneer (hereinafter, referred to as an upper veneer) 20U punched next is stacked on the upper veneer, the upper veneer 20U
Are rotated and stacked by 30 degrees with respect to the lower veneer 20L, and the upper veneer 20U is pressed against the lower veneer 20L.
Due to this pressing, as shown in FIG. 4 (b), the outward surface 27a of the fitting portion 27 of the inner fitting portion 26 of the upper veneer 20U and the outer fitting portion 25 of the lower veneer 20L. Inward face 2
5a is in a pressed state. In this state, the inner fitting portion 26 and the outer fitting portion 25 are annularly disposed over the entire inner peripheral edge of the shaft hole portion 23 of the core single plate 20, so that the inner fitting portion 20U of the upper single plate 20U fits inside. The outward surface 27a of the fitting portion 27 of the piece 26 and the outer fitting portion 2 of the lower single plate 20L
The inward surface 25a of FIG. 5 is in a state of being connected with the intaglio around the entire circumference, and as a result, the upper veneer 20U and the lower veneer 20L are in a state of being connected to each other in a stacked state.

Thereafter, the armature core 17 having a predetermined thickness in the axial direction is manufactured by repeatedly performing the rotation laminating step.

When it is desired to set a skew on the armature core 17, the upper veneer 20U is replaced with the lower veneer 20L.
When rotating sequentially by 30 degrees with respect to each other, the rotation angle is shifted little by little within the range of the circumferential width of the outer fitting portion 25 of the lower veneer 20L, so that the inside of the upper veneer 20U is The overlapping positions of the fitting portions 26 and the outer fitting portions 25 of the lower single plate 20L may be stacked so as to correspond to the inclination angle of the skew.

As described above, the core veneer 2 according to the present embodiment
According to the method of manufacturing a laminated core according to 0, a skew of a desired inclination angle can be easily set on the armature core 17. Further, since the inclination angle of the skew can be set within the range of the circumferential width of the inner fitting portion piece 26,
A skew having a larger inclination angle can be set as compared with the conventional example. For example, in the case of the present embodiment, the skew angle is theoretically 30 degrees at the maximum.

In the armature core 17 manufactured as described above, the coil wire 15 is wound around each salient pole 18 in the winding step, and the armature shaft 16 is inserted into the shaft hole 19.
Press-fit. At this time, the shaft hole 1 of the armature core 17
9 is constituted by the inward surface 24a of the shaft press-fitting piece 24 annularly arranged on the inner circumference of the shaft hole 23 of the core single plate 20, so that the armature shaft 16 It is fixed in a state where it is pressed into the inward surface 24a group.

An armature 14 in which a coil wire 15 is wound around an armature core 17 and an armature shaft 16 is fixed is disposed concentrically inside the four magnets 13 of the stator 11, and is rotatable on the armature shaft 16. It is supported by Thus, the DC motor 10 shown in FIG. 1 has been manufactured.

According to the DC motor 10 of the present embodiment, the magnetic flux Φ of the magnet 13 which is the field pole is connected to the single core plate 20 of the armature core 17 as shown by the dashed arrow in FIG. Since the magnetic flux Φ does not pass through the connecting portion between the outer fitting portion 25 and the inner fitting portion 26, the magnetic flux Φ is not disturbed by the connecting portion. As a result, an increase in the core cogging torque caused by the disturbance of the magnetic flux Φ can be prevented from occurring.

When the skew is set in the armature core 17, the change in the magnetic flux of the armature 14 becomes smooth, so that noise can be reduced.

In the above embodiment, the salient pole 1
Although the case where 8 is 12 even numbers has been described, when the salient poles 18 are odd and prime numbers, when laminating, the core single plate 20 is sequentially rotated by the number of the inner fitting portions 26. Meanwhile, the armature core 17 as a laminated core is manufactured by fitting the inner fitting portion 26 of the upper veneer 20U to the outer fitting portion 25 of the lower veneer 20L. 7).

FIG. 5 shows a brushless motor according to another embodiment of the present invention.

In the present embodiment, the laminated core according to the present invention is configured as a stator core of the brushless motor shown in FIG. The brushless motor 30 shown in FIG. 5 includes an eight-pole rotor (armature) 31 and a nine-pole salient pole stator 35. The rotor 31 has eight magnets 33 insert-molded at equal intervals in the circumferential direction on an outer peripheral portion of a core portion 32 formed of a resin and having a cylindrical shape, and an armature shaft 34 is provided on a center line of the core portion 32. Are insert-molded. The stator 35 includes a coil wire 36, a housing 37, and a stator core 38, and the nine salient poles 3 of the stator core 38 are provided.
A coil wire 36 is wound around 9, and a stator core 38 is press-fitted into a housing 37. The rotor 31 is concentrically disposed on the center line of the stator 35 and is rotatably supported. The rotor 31 absorbs the field magnetic flux and the eight magnets 33 by the coil wires 36 of the nine salient poles 39 of the stator 35. And it comes to rotate by repulsion.

The stator core 38 is constituted by a laminated core in which a plurality of single core plates 40 shown in FIG. 6 are laminated and connected to each other. That is, the stator core 38 is formed by pressing a core single plate from a rolled silicon steel plate by press working, and stacking and pressing on the previously punched core single plate to form the concave and convex portions of each other. A laminated core manufactured by a manufacturing method in which the cores are joined to each other by fitting. However, in the stator core 38 according to the present embodiment, the concavo-convex portions connecting the core single plates are formed on the outer peripheral edge portion.

That is, as shown in FIG. 6, a core single plate 40 punched and formed from a silicon steel plate by press working has a circular ring-shaped main body portion 41,
Nine T-shaped salient pole portions 42 corresponding to the salient poles 39 of the stator core 38 are radially projected at equal intervals in the circumferential direction on the inner periphery of the main body portion 41. Nine housing press-fitting pieces 4 as fixing portions are provided on the outer peripheral edge of the main body portion 41.
The housing press-fitting pieces 43 are opposed to the salient pole portions 42 with the main body portion 41 interposed therebetween. An inner fitting portion 4 serving as an inner fitting portion for substantially forming an uneven portion connecting the overlapping core veneers 40, 40 between the adjacent housing press-fitting portions 43, 43, respectively.
4 and outer fitting portions 45 as outer fitting portions are arranged alternately and protrude radially inward.

A fitting portion 46 is formed at the distal end of the outer fitting portion piece 45 by bending the distal end portion in the axial direction, and the inward surface 46a of the fitting portion 46 is overlapped with the opposing core veneer plate. The outer fitting surface 44a of the inner fitting portion 44 of the first fitting 40 is fitted to the outer fitting surface 44a. That is, as shown in FIG. 6A, the distance from the center O of the core veneer 40 to the outward surface 44a of the inner fitting portion 44 is d ₁ , and the distance from the outer surface of the outer fitting portion 45 to the outward surface 44a. Is d ₂ , the distance to the inward surface 46 a of the fitting portion 46 is d ₃ , and the distance to the housing press-fitting piece 43 is d ₄ , each of the distances d _{1 to} d ₄ is d ₄ <d
It is set so as to satisfy the relationship of ₂ <d ₁ <d ₃ . The outward surface 44a of the inner fitting portion 44 is formed in a concentric arc shape over the entire circumferential width between the adjacent housing press-fitting portions 43.

Next, the core veneer 4 constructed as described above is used.
The method of manufacturing the stator core 38 according to the above configuration using the above-described configuration will be described.

As shown in FIG. 7A, a core veneer (hereinafter referred to as a lower veneer) 40L previously punched out.
When a core veneer (hereinafter, referred to as an upper veneer) 40U punched out next is laminated on the upper veneer 40U,
Are rotated and stacked by 40 degrees with respect to the lower veneer 40L, and the upper veneer 40U is pressed against the lower veneer 40L.
By this pressing, as shown in FIG. 7 (b), the inward surface 46a of the fitting portion 46 of the outer fitting portion 45 of the upper veneer 40U and the inner fitting portion 44 of the lower veneer 40L. Outward facing surface 4
4a is in a pressed state. In this state, since the outer fitting portion 45 and the inner fitting portion 44 are arranged in a ring shape over the entire outer peripheral edge, the inward surface of the fitting portion 46 of the outer fitting portion 45 of the upper veneer 40U. 46a and the outwardly facing surface 44a of the inner fitting portion 44 of the lower veneer 40L are in a state of being connected with each other on the entire circumference, and as a result, the upper veneer 4
0U and the lower single plate 40L are connected to each other in a stacked state.

Thereafter, by repeatedly performing the rotation lamination process, the stator core 38 having the axial thickness specified in advance is manufactured.

When it is desired to set a skew in the stator core 38, when the upper veneer 40U is rotated by 40 degrees with respect to the lower veneer 40L and sequentially stacked,
By slightly rotating the rotation angle within the range of the circumferential width of the inner fitting portion 44 of the lower veneer 40L, the upper veneer 4
The overlap position of the outer fitting portion 45 of 0U and the inner fitting portion 44 of the lower single plate 40L may be stacked so as to correspond to the inclination angle of the skew.

As described above, the core veneer 4 according to the present embodiment
0, the stator core 3
8, a skew of a desired inclination angle can be easily set. Also, the skew angle of inclination is
Can be set within the range of the circumferential width, so that a skew having a larger inclination angle can be set as compared with the conventional example.

In the stator core 38 manufactured as described above, the coil wires 36 are wound around the salient poles 39 in a winding step, and the stator core 38 is pressed into the housing 37. At this time, the outer peripheral surface of the stator core 38 is formed by the housing press-fitting pieces 43 arranged annularly around the entire circumference of the core single plate 40.
, The outer surface 43a of the housing press-fitting piece 43 is fixed by being press-fitted into the housing 37.

Then, the coil wire 3 is attached to the stator core 38.
The rotor 31 is arranged concentrically inside the stator 35 formed by winding and press-fitting into the housing 37, and is rotatably supported on an armature shaft 34.
Thereby, the brushless motor 30 shown in FIG.
Was manufactured.

The brushless motor 30 according to the present embodiment
According to FIG. 5, the magnetic flux Φ of the field pole depends on the coupling portion between the inner fitting portion piece 44 and the outer fitting portion piece 45 of the stator core 38 to which the single core plate 40 is coupled, as indicated by the broken line arrow. , The magnetic flux Φ is not disturbed by the joint. As a result, an increase in the core cogging torque caused by the disturbance of the magnetic flux Φ can be prevented from occurring.

When the skew is set in the stator core 38, the change of the field magnetic flux becomes smooth, so that the noise can be reduced.

It should be noted that the present invention is not limited to the above-described embodiment, but may be modified without departing from the scope of the invention.
It goes without saying that various changes can be made.

For example, the laminated core is not limited to being constituted as an armature core of a DC motor or a stator core of a brushless motor, but may be constituted as a rotor core and a stator core of a rotating electric machine such as another motor or a generator.

The number of salient poles of the laminated core is not limited.

[0040]

As described above, according to the present invention,
By arranging the inner fitting portion and the outer fitting portion for joining the core single plates in the laminated core in the peripheral portion,
In the rotating electric machine, the magnetic flux can be prevented from passing through the coupling portion, so that the magnetic flux can be prevented from being disturbed, and the core cogging torque can be prevented from increasing.

[Brief description of the drawings]

FIG. 1 is a plan view of a DC motor showing an embodiment of the present invention.

FIG. 2 shows a core veneer used for the armature core, where (a) is a plan view and (b) is bb of (a).
It is sectional drawing which follows a line.

FIGS. 3A and 3B show a main part of a single core plate, wherein FIG. 3A is an enlarged plan view, and FIG. 3B is a sectional end view taken along line bb of FIG.

FIG. 4 shows a rotation lamination process of a core single plate, and (a)
Is an enlarged plan view, and (b) is a cross-sectional end view along line bb in (a).

FIG. 5 is a plan view showing a brushless motor according to another embodiment of the present invention.

6A and 6B show a single core plate used for the stator core, wherein FIG. 6A is a plan view, and FIG. 6B is a cross-sectional view taken along line bb of FIG.

FIG. 7 shows a step of rotating and laminating a core veneer, and FIG.
2 is a plan view, and FIG. 2B is a cross-sectional view taken along line bb of FIG.

[Explanation of symbols]

10 DC motor (rotary electric machine), 11 stator, 12
... housing, 13 ... magnet, 14 ... armature (rotor), 15 ... coil wire, 16 ... armature shaft, 17 ... armature core (rotor core), 18
... salient pole, 19 ... shaft hole, 20 ... core single plate, 21 ... body part,
Reference numeral 22: salient pole portion, 23: shaft hole portion, 24: shaft press-fitting portion (fixed portion), 25: outer fitting portion (outer fitting portion), 2
5a: inward facing surface, 26: inner fitting portion piece (inner fitting portion), 2
7 ... fitting part, 27a ... outward surface, 30 ... brushless motor (rotary electric machine), 31 ... rotor (armature), 32 ...
Core part, 33 ... magnet, 34 ... armature shaft, 35 ... stator, 36 ... coil wire, 37 ... housing, 38 ... stator core, 39 ... salient pole, 40 ... core plate, 41 ... body part, 42 ... salient pole part Reference numerals 43, housing press-fitting pieces (fixing pieces), 44 inner fitting pieces (inner fitting sections), 44a outward faces, 45 outer fitting pieces (outer fitting sections), 46 fitting Part, 46a ... inward facing surface.

Continued on the front page F term (reference) 5H002 AA07 AA08 AB05 AB06 AB07 AB09 AC06 AC08 AE08 5H615 AA01 BB01 BB14 BB16 PP01 PP02 PP07 PP28 SS03 SS04 SS05 SS09 SS19 TT05 5H621 GA01 GA04 GA12 GA14 JK04 JK05

Claims (4)

[Claims] 1. A laminated core in which a plurality of core veneers are laminated and mutually overlapping core veneers are joined to each other, an outer fitting portion and an inner fitting portion are formed on an annular peripheral portion of each core veneer. A laminated core, wherein the outer fitting portion and the inner fitting portion of the core single plates overlapping each other are fitted around the entire circumference. 2. The laminated core according to claim 1, wherein a position of the outer fitting portion and a position of the inner fitting portion are shifted in a circumferential direction to set a skew. 3. A rotating electric machine in which the laminated core according to claim 1 is used, wherein between the outer fitting portion and the inner fitting portion on an inner peripheral piece or an outer peripheral edge of the core single plate. A rotating electric machine characterized in that a fixed portion protrudes in a radial direction, and a shaft or a housing is fitted inside or outside the fixed portion. 4. The rotating electric machine according to claim 3, wherein the fixed portion is disposed so as to face each of a plurality of salient pole portions protruding from a peripheral portion of the core veneer. .