CN108270330B - Stator core bending device, stator core bending method and stator core - Google Patents
Stator core bending device, stator core bending method and stator core Download PDFInfo
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- CN108270330B CN108270330B CN201711477051.3A CN201711477051A CN108270330B CN 108270330 B CN108270330 B CN 108270330B CN 201711477051 A CN201711477051 A CN 201711477051A CN 108270330 B CN108270330 B CN 108270330B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/02—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
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Abstract
A stator core bending apparatus, a stator core bending method, and a stator core, the stator core bending apparatus comprising: a core rod having an arc portion centered on a central axis and a side portion closer to the central axis than a virtual side of a virtual circle formed by the arc portion, a first arm portion provided on one side of the arc portion of the core rod, the first arm portion being pressed against and bent in a linear stator core in a direction of the arc portion; and a second arm portion provided on one side of the side portion of the core rod, and pressing both end portions of the stator core in the direction of the side portion. By bending the stator core by the method of the present embodiment, it is possible to press the end portion of the stator core into a shape closer to a perfect circle in the case where the end portion of the stator core bulges outward due to dimensional deviation of the stator core.
Description
Technical Field
The invention relates to the field of motors, in particular to stator core bending equipment, a stator core bending method and a stator core.
Background
In the manufacturing process of the motor, it is necessary to bend the linear stator core into a circular shape or an approximately circular shape.
In the conventional manufacturing method, the stator core is shaped into a ring shape by pressing the linear stator core against the circular core rod, but in practice, the regular ring shape cannot be formed along the core rod due to the presence of the dimensional error. As shown in fig. 1, the linear stator core 20 is not circular but bulges outward after being molded around the core rod 10, that is, the linear stator core 20 is deformed in a ring shape formed after being molded around the core rod 10.
Patent document jp 2009-278841 discloses a method for molding a stator core, in which a rib is provided in a mold, and a linear stator core is wound around the rib to form an annular stator core. However, since the dimensional accuracy of the stator core itself varies, the end portion of the stator core is formed in a shape bulging outward after the stator core is wound along the rib.
It should be noted that the foregoing description of the background art is only for the purpose of providing a clear and complete description of the technical solution of the present invention and is presented for the convenience of understanding by those skilled in the art. The above-described solutions are not considered to be known to the person skilled in the art simply because they are set forth in the background of the invention section.
Disclosure of Invention
In order to solve at least one of the above problems, embodiments of the present invention provide a stator core bending apparatus, a stator core bending method, and a stator core.
According to a first aspect of an embodiment of the present invention, there is provided a stator core bending apparatus characterized by comprising:
a mandrel bar having an arc portion centered on a central axis and a side portion closer to the central axis than an imaginary side of an imaginary circle formed by the arc portion,
A first arm portion provided on one side of the circular arc portion of the core rod, the first arm portion being pressed against and bent in a linear stator core in a direction of the circular arc portion; and
And a second arm portion provided on one side of the side portion of the core rod, and pressing both end portions of the stator core in the direction of the side portion.
In one embodiment, the edge portion is straight or arcuate in shape as viewed in the axial direction.
In one embodiment, a protrusion extending in a direction away from the central axis is formed on the circular arc portion of the core rod, and the protrusion is located between two teeth of the stator core when the first arm portion presses and bends the linear stator core.
In one embodiment, the stator core bending apparatus further includes:
And a third arm portion provided above the core rod and conveying the bent stator core.
In one embodiment, the third arm portion has:
a first holding part for holding two ends of the bent stator core;
A second holding portion that holds one side of the two end portions that is radially opposite; and
And a first driving unit that drives the first and second gripping units to move in an axial direction to separate the bent stator core from the core rod, and drives the first and second gripping units to move in a direction perpendicular to the axial direction to convey the bent stator core to a next process.
According to a second aspect of the embodiments of the present invention, there is provided a method of bending a stator core in a straight line shape using a core rod having an arc portion centered on a central axis and an edge portion closer to the central axis than an imaginary edge of an imaginary circle constituted by the arc portion;
Characterized in that the method comprises:
Disposing a linear stator core on one side of the circular arc portion of the mandrel bar;
pressing the stator core against the circular arc portion of the core rod;
Pressing both end portions of the stator core against the edge portions of the core rod;
The two ends of the stator core are pressed against the edge portions again.
In one embodiment, the method further comprises: and conveying the bent stator core to the next process.
In one embodiment, the method of transporting the bent stator core to a next process includes:
holding an end portion of the bent stator core and a side radially opposite to the end portion;
separating the bent stator core from the core rod;
And carrying the separated stator core to the next process.
According to a third aspect of an embodiment of the present invention, there is provided a stator core having a plurality of core backs circumferentially surrounding a central axis; and a plurality of teeth extending radially inward from the plurality of core backs, characterized in that,
An annular connecting line formed by one end of the radial inner side of the plurality of teeth comprises a1 st arc which takes the central axis as a center; and a2 nd arc located radially inward of the virtual side of the virtual circle formed by the 1 st arc.
In one embodiment, the radially innermost position of the 2 nd arc is located within a range of 0 to 0.2mm from an imaginary side of an imaginary circle of the 1 st arc.
The embodiment of the invention has the beneficial effects that: by bending the stator core by the method of the present embodiment, it is possible to press the end portion of the stator core into a shape closer to a perfect circle in the case where the end portion of the stator core bulges outward due to dimensional deviation of the stator core. The motor thus formed reduces cogging torque and improves motor efficiency.
Specific embodiments of the invention are disclosed in detail below with reference to the following description and drawings, indicating the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the invention are not limited in scope thereby. The embodiments of the invention include many variations, modifications and equivalents within the scope of the terms of the appended claims.
Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments in combination with or instead of the features of the other embodiments.
It should be emphasized that the term "comprises/comprising" when used herein is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.
Drawings
Elements and features described in one drawing or one implementation of an embodiment of the invention may be combined with elements and features shown in one or more other drawings or implementations. Furthermore, in the drawings, like reference numerals designate corresponding parts throughout the several views, and may be used to designate corresponding parts as used in more than one embodiment.
The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. It is evident that the figures in the following description are only some embodiments of the invention, from which other figures can be obtained without inventive effort for a person skilled in the art.
In the drawings:
FIG. 1 is a schematic diagram of a prior art stator core forming method;
FIG. 2 is a top view of one embodiment of a stator core bending apparatus of example 1;
FIG. 3 is a schematic view of one embodiment of a mandrel of the stator core bending apparatus of example 1;
Fig. 4 is a schematic view of the stator core bending apparatus as seen from a side of the second arm portion;
fig. 5 is a schematic view of the stator core after the third arm portion holds the bent;
Fig. 6 is a schematic diagram of a stator core bending method of embodiment 2;
Fig. 7 is a schematic view of a bending process of the stator core;
fig. 8 is a schematic view of a stator core of embodiment 3.
Detailed Description
The foregoing and other features of the invention will become apparent from the following description, taken in conjunction with the accompanying drawings. In the specification and drawings, there have been specifically disclosed specific embodiments of the invention that are indicative of some of the ways in which the principles of the invention may be employed, it being understood that the invention is not limited to the specific embodiments described, but, on the contrary, the invention includes all modifications, variations and equivalents falling within the scope of the appended claims.
In the embodiments of the present invention, the terms "first," "second," and the like are used to distinguish between different elements from each other by name, but do not indicate spatial arrangement or time sequence of the elements, and the elements should not be limited by the terms. The term "and/or" includes any and all combinations of one or more of the associated listed terms. The terms "comprises," "comprising," "including," "having," and the like, are intended to reference the presence of stated features, elements, components, or groups of components, but do not preclude the presence or addition of one or more other features, elements, components, or groups of components.
In embodiments of the present invention, the singular forms "a," an, "and" the "include plural referents and should be construed broadly to mean" one "or" one type "and not limited to" one "or" another; furthermore, the term "comprising" is to be interpreted as including both the singular and the plural, unless the context clearly dictates otherwise. Furthermore, the term "according to" should be understood as "based at least in part on … …", and the term "based on" should be understood as "based at least in part on … …", unless the context clearly indicates otherwise.
In the embodiment of the present invention, for convenience of explanation, a direction parallel to a direction extending along the central axis is referred to as an "axial direction", a radial direction centered on the central axis is referred to as a "radial direction", and a direction around the central axis is referred to as a "circumferential direction", but this is merely for convenience of explanation, and does not limit an orientation of the stator core bending apparatus or the stator core in use and manufacture of the embodiment of the present invention.
Various embodiments of the present invention are described below with reference to the accompanying drawings. These embodiments are merely illustrative and not limiting of the invention.
Example 1
The present embodiment provides a stator core bending apparatus. Fig. 2 is a top view of an embodiment of the stator core bending apparatus, i.e. a schematic view of the stator core bending apparatus as seen in axial direction. As shown in fig. 2, the stator core bending apparatus includes: mandrel 100, first arm 200, and second arm 300. In the present embodiment, the mandrel bar 100 has an arc portion 101 centered on the central axis O, and a side portion 102 closer to the central axis O than a virtual side 101' of a virtual circle formed by the arc portion 101; the first arm 200 is provided on one side of the arc portion 101 of the core rod 100, and presses and bends the linear stator core in the direction of the arc portion 101 (the direction of arrow a shown in fig. 2); the second arm 300 is provided on one side of the side 102 of the core rod 100, and presses both end portions of the stator core in the direction of the side 102 (the direction of arrow B shown in fig. 2).
By bending a linear stator core by the stator core bending apparatus of the present embodiment, since the core rod is set to be non-circular, in the case where the end portion of the stator core bulges outward due to the dimensional deviation of the stator core, the end portion of the stator core can be pressed in so that the stator core forms a shape closer to a perfect circle.
In the present embodiment, the imaginary side 101' is arc-shaped, and the side 102 shown in fig. 2 is straight, but the present embodiment is not limited thereto, and the side 102 may be other shapes, for example, arc-shaped, with a smaller central angle than the imaginary side 101', thereby ensuring that the side 102 is closer to the central axis O than the imaginary side 101 '.
Fig. 3 is a schematic view of an embodiment of the mandrel bar 100, and as shown in fig. 3, a protrusion 103 extending in a direction away from the central axis O is further formed on the circular arc portion 101 of the mandrel bar 100, and when the first arm 200 presses and bends the linear stator core, the protrusion 103 is located between two teeth of the stator core. Thus, when the stator core is bent, the stator core can be positioned.
In this embodiment, the shapes of the first arm portion 200 and the second arm portion 300 are not limited, and in one embodiment, as shown in fig. 2, the sides of the first arm portion 200 and the second arm portion 300 facing the mandrel 100 have recesses 201, 301 for the third arm portion (not shown in fig. 2) to grip and convey the bent stator core. In addition, the present embodiment does not limit the shape of the surfaces of the first arm portion 200 and the second arm portion 300 on the side facing the core rod 100, and in one embodiment, as shown in fig. 2, the surfaces 202, 302 of the first arm portion 200 and the second arm portion 300 on the side facing the core rod are each substantially arc-shaped, and recesses or protrusions may be provided on the surfaces 202, 302 to facilitate pressing against the stator core.
Fig. 4 is a schematic view of the stator core bending apparatus as seen from one side of the second arm portion, and as shown in fig. 4, the stator core bending apparatus may further have a third arm portion 400 located at an upper side of the core rod 100 for carrying the bent stator core. So as to carry the stator core to the next process.
In the example of fig. 4, the third arm 400 is located at the upper side of the mandrel bar 100 in the axial direction for convenience of handling the bent stator core, but the present embodiment is not limited thereto, and the third arm 400 may be located at another position at the upper side of the mandrel bar 100 as long as it is ensured that it can successfully handle the bent stator core.
In the example of fig. 4, the axial heights of the core rod 100, the first arm portion 200, and the second arm portion 300, that is, the thickness h1 is shown, but the present embodiment is not limited to this thickness h1, and may be the same as the thickness (axial height) of the stator core, or may be larger or smaller than the thickness (axial height) of the stator core. The thicknesses of the mandrel bar 100, the first arm 200, and the second arm 300 may be the same or different, depending on the implementation.
In the example of fig. 4, a distance h2 between the third arm 400 and the core rod 100 is shown, and the present embodiment is not limited to this distance h2 either, and the distance h2 may be set to a distance that facilitates the transportation of the bent stator core by the third arm 400.
Fig. 5 is a schematic view of the third arm 400 holding the bent stator core S, and as shown in fig. 5, the third arm 400 includes a first holding portion 401 and a second holding portion 402, the first holding portion 401 holding both end portions of the bent stator core, and the second holding portion 402 holding one side of the bent stator core which is opposite to the both end portions in the radial direction. Further, the third arm portion 400 may further include a first driving portion (not shown in fig. 5) connected to the first grip portion 401 and the second grip portion 402 to drive the first grip portion 401 and the second grip portion 402 to move in an axial direction to separate the bent stator core S from the core rod 100, and to drive the first grip portion 401 and the second grip portion 402 to move in a direction perpendicular to the axial direction to carry the bent stator core S to a next process. The present embodiment does not limit the installation position and driving manner of the first driving portion.
In the implementation of the stator core bending apparatus of the present embodiment, the mandrel bar 100 and the first arm portion 200 may be provided on one operation table, and the second arm portion 300 may be provided at a position opposed to the first arm portion 200 across the mandrel bar 100. Further, a second driving portion may be provided to drive the first arm portion 200 to move toward the core rod 100 or away from the core rod 100 to press against or away from the stator core. Further, a third driving portion may be provided to drive the second arm portion 300 to move toward the core rod 100 or away from the core rod 100 to press against or away from both end portions of the stator core. The present embodiment does not limit the arrangement positions and driving modes of the second driving portion and the third driving portion.
In the present embodiment, the first driving unit, the second driving unit, and the third driving unit may be provided as one unit or may be provided separately, and may be implemented by hardware, software, or firmware, and the implementation is not limited in this embodiment.
The stator core is bent through the device of the embodiment, and the end part of the stator core is pressed in to form a shape which is closer to a perfect circle under the condition that the end part of the stator core bulges outwards due to the dimensional deviation of the stator core, so that the stator core is shaped conveniently.
Example 2
The present embodiment provides a method of bending a stator core, which bends a linear stator core using a mandrel having an arc portion centered on a central axis and a side portion closer to the central axis than an imaginary side of an imaginary circle formed by the arc portion. Specifically, the bending method of the stator core of the present embodiment may be implemented by the bending apparatus of the stator core of embodiment 1, and as for the structure and function of the bending apparatus of the stator core, reference may be made to embodiment 1, and details thereof are not repeated herein.
Fig. 6 is a schematic diagram of a bending method of the stator core of the present embodiment, as shown in fig. 6, including:
Step 601: a linear stator core is arranged on one side of the arc part of the core rod;
step 602: pressing the stator core against the circular arc portion of the core rod;
step 603: pressing both end portions of the stator core against the edge portions of the core rod;
Step 604: the two ends of the stator core are pressed against the edge portions again.
Fig. 7 is a schematic view of a bending process of the stator core, as shown in fig. 7, in a state a, the stator core bending apparatus is in a waiting state; in the state b, the linear stator core S is arranged on one side of the circular arc portion 101 of the mandrel bar 100 (step 601); in the state c, the stator core S is pressed against the circular arc portion 101 of the core rod 100 using the first arm portion 200 (step 602); in the state d, both end portions of the stator core S are pressed against the side portions 102 of the core rod 100 using the second arm portions 300 (step 603); in the state d, the second arm 300 may be used to press the two end portions of the stator core S against the side portions 102 again (step 604). The stator core thus formed is more nearly circular.
In this embodiment, the method may further include a step of transferring the bent stator core to a next process. For example, in the state d shown in fig. 7, the end portion of the bent stator core S and the side of the bent stator core S opposite to the end portion in the radial direction may be held by the third arm portion 400, the bent stator core S may be separated from the mandrel bar 100, and the separated stator core S may be transported to the next step.
By bending the stator core by the method of the embodiment, the end part of the stator core can be pressed in to enable the stator core to be in a shape more similar to a perfect circle under the condition that the end part of the stator core bulges outwards due to the dimensional deviation of the stator core, and the forming of the stator core is facilitated.
Example 3
The present embodiment provides a stator core having a plurality of core backs surrounding a central axis in a circumferential direction; and a plurality of teeth extending radially inward from the back of the plurality of cores, each of the plurality of teeth having a coil wound thereon. In this embodiment, the stator core is bent according to the bending method of the stator core of embodiment 2 using the bending apparatus of the stator core of embodiment 1, wherein the same points as those of embodiment 1 and embodiment 2 are not repeated.
Fig. 8 is a schematic view of a stator core according to the present embodiment, and as shown in fig. 8, in the present embodiment, an annular connecting line formed by the distal ends (radially inner ends) of the plurality of teeth includes a first circular arc 801 centered on the central axis and a second circular arc 802 radially inner than an imaginary side 801' of an imaginary circle formed by the first circular arc 801.
In this embodiment, since the apparatus of embodiment 1 is used and the stator core is bent according to the method of embodiment 2, the stator core is formed in a non-circular shape, and not in a shape in which the end portion bulges outward but in a shape in which the end portion is recessed inward, the stator core finally formed is more nearly circular than the conventional method of forming the stator core, and the cogging torque is reduced and the motor efficiency is improved by applying such a stator core to a motor.
In the present embodiment, the first arc 801 corresponds to the arc portion 101 of the mandrel 100, and the second arc 802 corresponds to the side portion 102 of the mandrel 100.
In the present embodiment, as shown in fig. 8, the position of the 2 nd arc 802 on the most radially inner side may be located within a range of 0 to 0.2mm from the imaginary side 801' of the imaginary circle formed by the 1 st arc 801, but the present embodiment is not limited thereto, depending on the implementation.
The stator core of this embodiment is bent using the apparatus of embodiment 1 and the method of embodiment 2, and the formed stator core is more nearly in the shape of a perfect circle, so that the cogging torque of the formed motor is reduced and the motor efficiency is improved.
In the present embodiment, as described above, the stator core may be applied to a motor that may be applied to an electric product including a motor, and as to other components of the motor or other components of the electric product, reference may be made to the prior art, and details thereof will not be repeated here.
While the invention has been described in connection with specific embodiments, it will be apparent to those skilled in the art that the description is intended to be illustrative and not limiting in scope. Various modifications and alterations of this invention will occur to those skilled in the art in light of the spirit and principles of this invention, and such modifications and alterations are also within the scope of this invention.
Claims (10)
1. A stator core bending apparatus, characterized in that the stator core bending apparatus comprises:
a mandrel bar having an arc portion centered on a central axis and a side portion closer to the central axis than an imaginary side of an imaginary circle formed by the arc portion,
A first arm portion provided on one side of the circular arc portion of the core rod, the first arm portion being pressed against and bent in a linear stator core in a direction of the circular arc portion; and
And a second arm portion provided on one side of the side portion of the core rod, and pressing both end portions of the stator core in the direction of the side portion.
2. The stator core bending apparatus according to claim 1, wherein the edge portion is linear or arcuate in shape as viewed in the axial direction.
3. The stator core bending apparatus according to claim 1, wherein a protrusion extending in a direction away from the central axis is formed on the circular arc portion of the core rod, the protrusion being located between two teeth of the stator core when the first arm portion presses and bends the linear stator core.
4. The stator core bending apparatus according to claim 1, the stator core bending device is characterized by further comprising:
And a third arm portion provided above the core rod and conveying the bent stator core.
5. The stator core bending apparatus according to claim 4, wherein the third arm portion has:
a first holding part for holding two ends of the bent stator core;
A second holding portion that holds one side of the two end portions that is radially opposite; and
And a first driving unit that drives the first and second gripping units to move in an axial direction to separate the bent stator core from the core rod, and drives the first and second gripping units to move in a direction perpendicular to the axial direction to convey the bent stator core to a next process.
6. A method for bending a stator core, wherein a linear stator core is bent using a mandrel having an arc portion centered on a central axis and a side portion closer to the central axis than an imaginary side of an imaginary circle formed by the arc portion;
Characterized in that the method comprises:
Disposing a linear stator core on one side of the circular arc portion of the mandrel bar;
pressing the stator core against the circular arc portion of the core rod;
Pressing both end portions of the stator core against the edge portions of the core rod;
The two ends of the stator core are pressed against the edge portions again.
7. The method of claim 6, wherein the method further comprises:
and conveying the bent stator core to the next process.
8. The method of claim 7, wherein transporting the bent stator core to a next process step comprises:
holding an end portion of the bent stator core and a side radially opposite to the end portion;
separating the bent stator core from the core rod;
And carrying the separated stator core to the next process.
9. A stator core having a plurality of core backs circumferentially surrounding a central axis; and a plurality of teeth extending radially inward from the plurality of core backs, characterized in that,
An annular connecting line formed by one end of the radial inner side of the plurality of teeth comprises a1 st arc which takes the central axis as a center; and a 2 nd arc located radially inward of the virtual side of the virtual circle formed by the 1 st arc;
The end portions of two of the teeth of the plurality of cores are positioned radially inward of the other teeth to form the 2 nd arc.
10. The stator core according to claim 9, wherein a position of the 2 nd arc that is most radially inward is located within a range of 0 to 0.2mm from an imaginary side of an imaginary circle of the 1 st arc.
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| JP5620126B2 (en) * | 2009-05-15 | 2014-11-05 | 株式会社三井ハイテック | Laminated iron core |
| JP5573395B2 (en) * | 2010-06-15 | 2014-08-20 | アイシン・エィ・ダブリュ株式会社 | Stator manufacturing method |
| JP5680397B2 (en) * | 2010-12-15 | 2015-03-04 | 株式会社マキタ | Electric motor stator |
| KR20130033668A (en) * | 2011-09-27 | 2013-04-04 | 엘지이노텍 주식회사 | Stator core for motor |
| KR101876226B1 (en) * | 2011-10-20 | 2018-07-09 | 엘지이노텍 주식회사 | Stator core for Motor and manufacturing method thereof |
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