Rotating electrical machine
阅读说明:本技术 旋转电机 (Rotating electrical machine ) 是由 谷口真 福岛明 松原贤 土井智史 于 2018-05-29 设计创作,主要内容包括:旋转电机包括:转子,上述转子被自由旋转地支承;以及定子,上述定子包括与转子同轴配置的定子铁芯(21)。定子铁芯通过层叠多个钢板(32)而构成,具有环状的轭部(35)、从该轭部沿径向延伸的多个极齿(34)、以及设置在相邻的极齿之间的槽(37)。在槽中卷绕定子绕组。轭部在使槽沿径向延伸的位置具有沿钢板的层叠方向延伸的孔部(43),在该孔部内设置有由磁性粉体构成的粉体成形体(42)。(The rotating electric machine includes: a rotor rotatably supported; and a stator including a stator core (21) disposed coaxially with the rotor. The stator core is formed by laminating a plurality of steel plates (32), and has an annular yoke portion (35), a plurality of pole teeth (34) extending in the radial direction from the yoke portion, and slots (37) provided between adjacent pole teeth. The stator windings are wound in the slots. The yoke has a hole (43) extending in the direction of lamination of the steel plates at a position where the slot extends in the radial direction, and a powder compact (42) made of magnetic powder is provided in the hole.)
An rotary electric machine, comprising:
a rotor (12) freely rotatably supported; and
a stator (13) including a stator core (21) arranged coaxially with the rotor,
the stator core is formed by laminating a plurality of steel plates (32), and has an annular yoke portion (35), a plurality of pole teeth (34) extending in the radial direction from the yoke portion, and a slot (37) provided between the adjacent pole teeth,
in which slots a stator winding (22) is wound,
the yoke portion has a hole portion (43) extending in the stacking direction of the steel plates at a position where the slot extends in the radial direction, and a powder compact (42) made of magnetic powder is provided in the hole portion.
2. The rotating electric machine according to claim 1,
the yoke portion is provided with the hole portion at a position closer to the slot than a center position of a yoke width in a radial direction.
3. The rotating electric machine according to claim 2,
the hole has a cross-sectional shape in which a circumferential length dimension is larger than a radial length dimension.
4. The rotating electric machine according to any of claims 1 to 3,
the stator core has a plurality of core blocks (31) connected in the circumferential direction, and is formed in an annular shape by fixing adjacent core blocks to each other,
the core piece has two or more of the pole teeth,
the slot is formed between two adjacent teeth of core pieces, and between teeth of each of the two adjacent core pieces,
the hole and the powder compact are provided so as to correspond to a groove formed between the teeth of the core block among the plurality of grooves.
5. The rotating electric machine according to any of claims 1 to 4,
the hole portion is a through hole penetrating the stator core in the axial direction,
the powder molded body has protruding portions (51) that protrude outward from the holes at both end surfaces in the axial direction of the stator core.
6. The rotating electric machine according to any of claims 1 to 4,
the hole portion is a through hole which penetrates the stator core in the axial direction and has, at both axial end portions of the stator core, enlarged diameter portions (53) having a larger diameter than that of the axial center portion,
the powder molded body is provided in the hole including the diameter-expanded portion between both end surfaces of the stator core.
7. The rotating electric machine according to any of claims 1 to 6,
a caulking section (41) for fixing the plurality of steel plates by press fitting is provided at a position of the yoke where the pole teeth extend in the radial direction.
8. The rotating electric machine according to claim 7,
in the yoke, the position of the hole in the radial direction is different from the position of the caulking portion, and the hole is closer to the groove.
9. The rotating electric machine according to claim 7 or 8,
the powder molded body has a higher resistivity than the rivet.
10. The rotating electric machine according to of claims 1 to 9,
the stator core is formed by axially connecting a plurality of annular core members (61-63), the plurality of core members (61-63) being a laminate of the steel plates and having the yoke, the pole teeth, and the slots,
the hole and the powder compact are provided in the yoke portions of the plurality of core members, respectively.
11. The rotating electric machine according to claim 10,
the plurality of core members are stacked with a phase shift of a predetermined angle in the circumferential direction, and the positions of the holes are different in the circumferential direction in the square core member and the square core member that are coupled to each other.
Technical Field
The invention relates to kinds of rotating electric machines.
Background
In a rotating electrical machine, , a stator core is configured by laminating a plurality of magnetic steel sheets made of soft magnetic material, and as a method of fixing the laminated magnetic steel sheets to each other, there is known a method of welding in a laminating direction and press-fitting and fastening by concave-convex caulking.
In addition, for example, patent document 1 describes a structure in which, in a rotating electrical machine, a stator includes a cylindrical stator core (stator core) and a plurality of auxiliary cores manufactured by compression molding of metal magnetic powder after an insulating coating treatment, the auxiliary cores include a rod-shaped core portion inserted into a slot of the stator core and a heat dissipation portion formed integrally at an end of the rod-shaped core portion, and the heat dissipation portion is disposed so as to protrude from an end face side of the stator core.
Disclosure of Invention
However, in the structure described in patent document 1, since the auxiliary core is inserted into the slot of the stator core, there is a possibility that the slot area, that is, the area of the conductor housing portion, or the radial dimension of the yoke portion is sacrificed. Further, the resistance value of the stator winding increases at the expense of the slot area, which is considered to hinder high-efficiency design. Further, since the radial dimension of the yoke is sacrificed, it is considered that the mechanical rigidity of the yoke is reduced to cause generation of vibration noise. In short, in order to solve these problems, the size of the apparatus may be increased.
In addition, it is also conceivable to form the entire stator core or the yoke portion by magnetic powder, but at the present time, magnetic permeability as magnetic properties of the magnetic powder is several times lower than that of the electromagnetic steel sheet, and therefore, there is a possibility that a significant performance degradation is caused in the rotating electrical machine. Therefore, the size of the apparatus may be increased.
The present invention has been made in view of the above-described problems, and a main object thereof is to provide types of rotating electrical machines that can suppress the generation of eddy currents in the stator and exhibit high efficiency performance.
Hereinafter, a method for solving the above-described problems and the effects thereof will be described.
In the method, comprising:
a rotor rotatably supported; and
a stator including a stator core disposed coaxially with the rotor,
the stator core is formed by laminating a plurality of steel plates, and has an annular yoke, a plurality of pole teeth extending in a radial direction from the yoke, and a slot provided between the adjacent pole teeth,
in the above-mentioned slots a stator winding is wound,
the yoke portion has a hole portion extending in the stacking direction of the steel plates at a position where the groove extends in the radial direction, and a powder compact made of magnetic powder is provided in the hole portion.
In the above configuration, the groove is provided with a hole extending in the stacking direction of the steel sheets at a position extending in the radial direction, and the powder compact made of the magnetic powder is provided in the hole. Here, it is considered that eddy currents are likely to occur at positions where the slots extend in the radial direction in the yoke portion of the stator core, but by providing the holes as described above and providing the powder compact made of the magnetic powder in the holes, the specific resistance can be increased and the magnetic permeability can be decreased at the positions where eddy currents are likely to occur. This can suppress eddy current loss. Further, by limiting the position of filling the magnetic powder to the radial direction extending position of the slot, the magnetic permeability of most of the portion through which the main magnetic flux flows is not reduced, and the performance degradation of the rotating electric machine caused by the reduction of the magnetic permeability can be suppressed.
In the structure in which the powder compact is provided in the hole, the steel sheets in a laminated state are fixed by the powder compact (magnetic powder). Therefore, for example, the powder compact can be used as a means for fixing the laminated steel sheet, and can replace welding or uneven caulking, or reduce the number of welding points or uneven caulking fastening points. Therefore, it is possible to suppress a problem that the resistance is reduced by using a large number of welding portions and caulking portions, and an eddy current is likely to flow.
As described above, in the rotating electrical machine having the above-described configuration, the generation of eddy current in the stator can be suppressed, and high-efficiency performance can be exhibited.
In the second method, the hole is provided in the yoke portion at a position closer to the groove than a center position of the yoke width in the radial direction.
According to the analysis by the present inventors, it was confirmed that a portion of the yoke portion of the stator core where an eddy current is likely to be generated is a position close to the slot. Therefore, by providing the hole portion at a position closer to the slot than the center position in the radial direction in the yoke portion, the eddy current can be more appropriately suppressed.
In the third method, the hole portion has a cross-sectional shape in which a length dimension in a circumferential direction is larger than a length dimension in a radial direction.
The hole of the yoke is formed in a shape having a cross section with a circumferential length larger than a radial length. Thus, in the case where the hole portion is provided closer to the slot than the center position in the radial direction in the yoke portion, the position of the hole portion is restricted, and the cross section of the hole portion (that is, the cross section of the powder compact) can be increased as much as possible. Therefore, an appropriate eddy current suppressing effect can be expected.
In the fourth method, the stator core includes a plurality of core pieces connected in a circumferential direction, adjacent core pieces are fixed to each other to form an annular shape, the core piece includes two or more teeth, the groove is formed between two adjacent teeth of the core piece and between teeth of the two adjacent core pieces, and the hole and the powder compact are provided so as to correspond to a groove formed between the teeth of the core piece among the plurality of grooves.
In the stator core in which a plurality of core blocks are connected, core block joint portions (joint boundary portions) are provided at predetermined intervals on the radial extension line of the slots, in view of point , it is preferable to provide holes and powder molded bodies corresponding to the slots formed between two adjacent teeth of the same core block among the plurality of slots.
In the fifth method, the hole portion is a through hole penetrating the stator core in the axial direction, and the powder compact has protruding portions protruding outward from the hole portion along both end surfaces in the axial direction of the stator core.
According to the above configuration, the compression load toward the axial center side of the stator core can be generated by the powder compact, and therefore, the plurality of steel plates can be pressed from both ends in the stacking direction, and the reliability of fixing the steel plates in the stacked state can be further improved .
In the sixth method, the hole portion is a through hole which penetrates in the axial direction of the stator core, and has expanded diameter portions having a larger diameter than that of an axial center portion at both axial end portions of the stator core, and the powder compact is provided in the hole portion including the expanded diameter portions between both end surfaces of the stator core.
According to the above configuration, the compression load toward the axial center side of the stator core can be generated by the powder compact, and therefore, the plurality of steel plates can be pressed from both ends in the stacking direction, and the reliability of fixing the steel plates in the stacked state can be further improved .
In the seventh method, a caulking portion that fixes the plurality of steel plates by press fitting is provided in the yoke at a position where the teeth extend in the radial direction.
In view of point , the yoke is configured such that a caulking portion is provided at a position where the teeth extend in the radial direction.
In the eighth method, the position of the hole in the yoke in the radial direction is different from the position of the caulking portion, and the hole is closer to the groove.
In this case, the electric characteristics can be optimized well, and the steel plates can be fixed in a laminated state as the stator core, and further, the distance between the hole portion and the caulking portion is increased as compared with a structure in which the hole portion and the caulking portion are provided at the same position in the radial direction, and the change in the electric resistance of the yoke portion can be made gentle.
In the ninth method, the powder compact has a higher resistivity than the rivet.
The powder molded body has a higher resistivity than the rivet. This can effectively suppress eddy current and clarify the design rule thereof as a physical property value.
In the tenth method, the stator core is formed by axially coupling a plurality of annular core members, each of which is a laminated body of the steel plates and has the yoke, the pole teeth, and the slots, and the hole portions and the powder molded bodies are provided in the yoke of the plurality of core members, respectively.
In this case, the powder compact in the stator core is not integrally provided in directions along the entire core thickness direction, but is provided in a plurality of segments into the respective core members.
In the tenth method, the plurality of core members are stacked with a phase shift of a predetermined angle in the circumferential direction, and the positions of the hole portions are different in the circumferential direction between the square core member and the square core member that are coupled to each other.
In addition, in the case of performing the rotational lamination, the hole portions of the core members are not positioned , and there is a possibility that a through hole is not formed between both end surfaces of the stator core.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description with reference to the accompanying drawings. The drawings are as follows.
Fig. 1 is a longitudinal sectional view of a rotating electric machine.
Fig. 2 is a perspective view of the core block.
Fig. 3 is a perspective view of the stator core showing a state in which a plurality of core blocks are joined.
Fig. 4 is a sectional view showing a hole portion of the yoke.
Fig. 5 is an enlarged cross-sectional view showing a laminated portion of steel plates.
Fig. 6 (a) is a plan view of the core block, and fig. 6 (b) is a graph showing a difference in eddy current loss at each positions of positions a1 to a 4.
Fig. 7 is a diagram showing the magnetic properties of the magnetic powder and the magnetic properties of the electromagnetic steel sheet.
Fig. 8 is a sectional view showing a hole portion of a yoke in another configuration.
Fig. 9 is a sectional view showing a hole portion of a yoke in another configuration.
Fig. 10 is a diagram for explaining the structure of a stator core made up of a plurality of core members.
Detailed Description
The present invention relates to a rotary electric machine, and more particularly, to a rotary electric machine, and a method for manufacturing the same, wherein the rotary electric machine is used for industrial use, vehicle use, household electric appliance use, OA equipment use, game machine use, and the like.
The rotating
The rotating
In the present embodiment, any configuration can be applied as the magnetic pole configuration of the
The
The
As shown in fig. 2, the
The
In a state where the
Next, the
As shown in fig. 2 and 3, the
Further, the
In the
The
The
Here, the punched cut surface of the
In the case where the core material formed into a rod shape in advance is press-fitted into the
In the configuration in which the core blocks 31 are connected in an annular shape as described above, the
Next, the difference in eddy current loss due to the difference in the fixing position of the
In fig. 6 (a), a1 and a4 are positions where the
In fig. 6 (b), the difference in eddy current loss due to the difference in the fixing method is shown, assuming that caulking is performed at each of the positions a1 to a4 and filling and fixing of the magnetic powder is performed. Further, a1 and a4 indicate the results of the caulking alone, and a2 and A3 indicate the results of the caulking and the filling.
As shown in fig. 6 (b), when caulking is performed at positions a1 to a4, eddy current is relatively less generated at positions a1 and a4 on the tooth extension line. In addition, although eddy current is rarely generated at a2, which is an outer peripheral side position, at positions a2 and A3 on the slot extension line, it can be confirmed that significant eddy current is generated at A3, which is an inner peripheral side position. That is, it is found that eddy current is remarkably generated at a portion on the radial extension line of the
On the other hand, it is found that when the magnetic powder is filled and fixed at the positions a2 and A3, the eddy current loss is significantly reduced. From the estimated values, as an expected value of the eddy current loss reduction at 9000rpm at no load, a reduction of about 50W is expected.
Further, in the
Fig. 7 is a graph showing a comparison between the magnetic properties of the magnetic powder (SMC) and the magnetic properties of the electromagnetic steel sheet. As is clear from fig. 7, in the magnetic powder, the magnetic permeability, which is the gradient of the characteristics, is low in the region where the magnetic field strength H is weak, and therefore, it is considered that the performance of the rotating electric machine is deteriorated by the magnetic powder of a large use. In this regard, by minimizing the use of the magnetic powder, the performance degradation is minimized.
The magnetic powder has an electrical conductivity of 3000S/m, about 1/7S/m compared with 23800S/m of an electromagnetic steel sheet, and is a material in which an eddy current hardly flows. In fact, since the uneven riveted portion of the electromagnetic steel sheet is broken by the insulating coating, the electrical conductivity should be a value several times larger than the previous value. For the above reasons, the above configuration of the present embodiment minimizes the performance degradation and minimizes the eddy current loss.
According to the present embodiment described in detail above, the following excellent effects can be obtained.
In the above configuration, in the
In the configuration in which the
As described above, in the rotating
In view of the fact that eddy currents are likely to occur in the
The
In the
In view of points that the yoke portion extending in the radial direction of the
In the
The
(other embodiments)
The above embodiment may be modified, for example, as follows.
For the filling and fixing by the magnetic powder, other structures may be adopted. For example, in the configuration shown in fig. 8, as in fig. 4, the
In this case, since the powder compact 42 can generate the compression load F3. toward the axial center of the
In the structure shown in fig. 9, in the
In this case, since the compression load F4. toward the axial center side of the
The diameter-enlarged
In the above embodiment, two
In the above embodiment, the
The
The
According to the configuration of fig. 10, the powder compact 42 in the
The
In the above embodiment, the hole 43 (powder molded body 42) is provided in the
In the above embodiment, as a method for fixing the
In the above-described embodiment, the configuration in which the rotating
The present invention has been described in terms of embodiments, but it is to be understood that the invention is not limited to the embodiments and constructions described above, and that the invention encompasses various modifications and equivalent arrangements and that various combinations and embodiments and further including only elements, or more, or or less are also within the scope and spirit of the invention.
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