CN113452174A - Yoke and method for manufacturing yoke - Google Patents
Yoke and method for manufacturing yoke Download PDFInfo
- Publication number
- CN113452174A CN113452174A CN202110254613.8A CN202110254613A CN113452174A CN 113452174 A CN113452174 A CN 113452174A CN 202110254613 A CN202110254613 A CN 202110254613A CN 113452174 A CN113452174 A CN 113452174A
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- Prior art keywords
- yoke
- insulator
- split
- back yoke
- outer edge
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/32—Windings characterised by the shape, form or construction of the insulation
- H02K3/325—Windings characterised by the shape, form or construction of the insulation for windings on salient poles, such as claw-shaped poles
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/10—Applying solid insulation to windings, stators or rotors
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Insulation, Fastening Of Motor, Generator Windings (AREA)
Abstract
The invention provides a yoke which can restrain burrs generated when an insulator is formed on a split yoke. The yoke is configured by arranging a plurality of split yokes 10 in a ring shape, and the split yokes 10 have a back yoke portion 11 integrally formed by laminating a plurality of magnetic steel plates and extending in a circumferential direction of the yoke, a single tooth portion 12 extending from the back yoke portion 11 in a radial direction of the yoke, and an insulator 13 formed of an insulating resin and covering a region from the tooth portion 12 to the back yoke portion 11. The insulator 13 has an outer edge region 13E whose thickness decreases stepwise as it is located closer to the end of the back yoke portion 11 when viewed in the axial direction of the yoke.
Description
Technical Field
The present invention relates to a yoke and a method of manufacturing the yoke.
Background
Conventionally, as a technique for integrally forming an insulator on the outer periphery of a tooth by dividing a yoke constituting a stator of a motor for each tooth, inserting the divided yoke into a metal mold, and filling resin into the metal mold, a technique described in patent document 1 is known.
In the technique described in patent document 1, in a split yoke (stator core in patent document 1) divided for each tooth, an end portion of a back yoke is connected by a connecting portion, a plurality of teeth are spread in an opening direction, the plurality of split yokes are fixed to the inside of a metal mold in the spread state, and resin is filled into the metal mold, whereby resin is integrally formed on the outer periphery of the tooth.
Patent document
Patent document 1: japanese laid-open patent publication No. 2006-180698
Disclosure of Invention
As shown in patent document 1, in a structure in which a plurality of split yokes are fixed inside a metal mold and a molten resin is filled inside the metal mold to form an insulator on the outer periphery of a tooth, a part of the resin filled inside the metal mold flows out from a boundary between an outer surface of the split yoke and an inner surface of the metal mold, and thus a so-called burr is sometimes formed.
In a structure including a back yoke portion and a tooth portion integrally formed with the back yoke portion, for example, when an insulator is integrally formed using a metal mold in a region from an outer periphery of the tooth portion to a part of the back yoke portion, it is considered that a part of the resin leaks out to an end portion of the back yoke (an end portion in a direction along a circumferential direction of the yoke) and a burr protrudes.
In the structure in which the burrs are formed as described above, when the split yoke is configured by annularly arranging the split yoke, a problem may occur in that the burrs prevent the end portions of the back yoke from being coupled to each other.
Although the burr thus formed can be eliminated to some extent by improving the accuracy of the metal mold, it is difficult to completely prevent the generation of the burr, and improvement thereof is desired.
For these reasons, development of a yoke and a method for manufacturing the yoke, which can suppress the occurrence of burrs when an insulator is formed on a split yoke, has been sought.
The characteristic structure of the yoke according to the present invention is as follows: the yoke is configured by arranging a plurality of split yokes in a ring shape, wherein the split yokes comprise: a back yoke portion integrally formed by laminating a plurality of magnetic steel plates and extending in a circumferential direction of the yoke; the single tooth portion extends from the back yoke portion in a radial direction of the yoke; the insulator is formed of an insulating resin so as to cover a region from the tooth portion to the back yoke portion, and has an outer edge region in which a thickness decreases in a stepwise manner as the insulator is located closer to an end portion of the back yoke portion when viewed in an axial direction of the yoke.
According to this feature, the insulator integrally formed on the outer surface of the split yoke has an outer edge region whose thickness is reduced in a stepwise manner as it is located closer to the end of the back yoke portion of the split yoke. With such a configuration, even when the split yoke is fixed to the inside of a mold and the insulator is formed by filling molten resin into the inside of the mold, for example, since the resin flows to the outer edge region, the resin is preferentially filled from a wider region, and therefore the flow temperature of the resin (flow front temperature) decreases in the region narrowed in the stepwise manner, the phenomenon in which the resin flows out from the region where the insulator is to be formed to the outside can be suppressed, and the occurrence of burrs can be suppressed.
Therefore, the yoke is formed in which the occurrence of burrs is suppressed when the insulator is formed on the split yoke. In particular, since the generation of burrs is suppressed, the operation of removing the burrs can be omitted.
In addition to the above configuration, the number of steps formed in the stepped shape may be 3 or more.
Thus, when the insulator is formed on the outer surface of the split yoke by the metal mold, the flow of the resin can be suppressed by the three-step portion, and the occurrence of burrs can be suppressed satisfactorily.
In addition to the above configuration, the outer edge region may be formed in the end portion of the back yoke portion over the entire area in a direction along the axial center of the yoke.
Thus, the outer edge region is formed over the entire width of the end portion of the back yoke portion in the direction along the axial center of the yoke, and therefore, the occurrence of burrs in a wide region can be suppressed.
The characteristic structure of the manufacturing method of the magnetic yoke according to the invention is characterized in that: the method is a method for manufacturing a yoke configured by arranging a plurality of split yokes in a ring shape, wherein a plurality of magnetic steel plates are laminated to integrally form the split yokes having a back yoke portion extending in a circumferential direction of the yoke and a single tooth portion extending from the back yoke portion in a radial direction of the yoke, the split yokes are accommodated in a metal mold, an inner space of the metal mold is filled with a molten insulating resin and solidified to form an insulator, the insulator has an outer edge region whose thickness decreases in a stepwise manner as it approaches an end portion of the back yoke portion as viewed in an axial direction of the yoke, the split yokes having the insulator formed thereon are arranged in a ring shape, and adjacent back yoke portions are joined to each other.
Thus, the split yoke is fixed to the inside of the metal mold, and the inside of the metal mold is filled with a molten resin and solidified, thereby forming the insulator having the outer edge region whose thickness is reduced stepwise in the vicinity of the end portion of the back yoke on the outer surface of the split yoke. In addition, in the case where the insulator is formed using the metal mold as described above, since the resin is preferentially filled from the wide region when flowing to the outer edge region, the flow temperature (flow front temperature) of the resin is lowered in the region narrowed in the stepwise manner, and therefore, the phenomenon in which the resin flows out from the region where the insulator is to be formed to the outside can be suppressed, and the occurrence of burrs can be suppressed. Then, the split yoke having the insulator integrally formed as described above is arranged in a ring shape, thereby completing the yoke.
Therefore, a method for manufacturing a yoke is obtained, in which the occurrence of burrs is suppressed when the insulator is formed on the split yoke. In particular, since the burrs are suppressed in this manner, the work of removing the burrs can be omitted.
Drawings
Fig. 1 is a sectional view showing a yoke of a motor.
Fig. 2 is a sectional view of the split yoke around which the coil wire is wound.
Fig. 3 is a perspective view of the split yoke.
Fig. 4 is a cross-sectional top view of an insulator formed on a back yoke portion.
Fig. 5 is a longitudinal sectional side view of an insulator formed on an upper surface of a split yoke.
Fig. 6 is a cross-sectional top view of the back yoke portion and the metal mold.
Fig. 7 is a longitudinal sectional side view of the upper surface of the yoke and the metal mold.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[ basic Structure ]
Fig. 1 shows a cross section of the motor, and a plurality of (9 in the present embodiment) split yokes 10 are annularly arranged on an inner periphery of a cylindrical housing 1 centered on an axial center X to constitute a yoke Y. The yoke Y forms a magnetic path and functions as a stator (stator) of the motor.
Further, in the housing 1, a rotor 3 is disposed in an inner space of the yoke Y formed in a ring shape, the rotor 3 rotates integrally with the shaft 2, and the shaft 2 is supported rotatably coaxially with the axial center X. The rotor 3 functions as a rotor, and a plurality of permanent magnets 4 are embedded therein. The case 1 is made of a non-magnetic material such as resin, but a magnetic material such as an iron material may be used.
As shown in fig. 1 to 3, in the split yoke 10, a plurality of magnetic steel plates are stacked to form a back yoke portion 11 extending in the circumferential direction of the yoke Y and a single tooth portion 12 extending from the back yoke portion 11 in the radial direction of the yoke Y. The split yoke 10 includes an insulator 13 made of an insulating resin covering a region from the tooth portion 12 to the back yoke portion 11, and a coil portion C is formed by winding a coil wire 14 such as a copper wire having an insulating coating formed on an outer periphery of the insulator 13.
Although the insulating body 13 is made of a thermoplastic resin that is a non-newtonian fluid, the resin forming the insulating body 13 is not limited to a specific resin as long as it is an insulating resin.
As shown in fig. 2 and 3, in the rear yoke portion 11, a convex portion 11a is formed on one of both end portions in the circumferential direction of the yoke Y, and a concave portion 11b is formed on the other. The convex portion 11a is formed as a region protruding in the direction of lamination of the magnetic steel sheets, and the concave portion 11b is formed as a groove shape along the direction of lamination of the magnetic steel sheets. As a result, as shown in fig. 1, the convex portion 11a and the concave portion 11b are fitted to each other, and the adjacent split yokes 10 are joined to each other, whereby an appropriate positional relationship can be maintained.
[ insulator ]
As shown in fig. 1 to 5, in the split yoke 10, the core of the stator is formed by laminating magnetic steel plates in the direction along the axis X, and a flange portion 12a having a width larger in the circumferential direction than the tooth portion 12 is formed at the end portion on the protruding side of the tooth portion 12.
The insulator 13 is formed in a region from the end portion on the projecting side of the tooth portion 12 to the back yoke portion 11, a tip side regulating portion 13a projecting outward from the tooth portion 12 so as to surround the tooth portion 12 is integrally formed at the end portion on the projecting side of the tooth portion 12, and a base side regulating portion 13b projecting in both directions (both sides in the direction along the axis X) in the laminating direction is integrally formed at the base end portion of the tooth portion 12.
Further, the tip side regulating portions 13a project to both sides in the direction along the stacking direction of the magnetic steel plates at the end portions on the projecting sides of the tooth portions 12, and the base end side regulating portions 13b project to both sides in the direction along the stacking direction of the magnetic steel plates in the rear yoke portion 11 connected to the base ends of the tooth portions 12. By forming the insulator 13 in this way, the coil wire 14 forming the coil portion C is wound around the region surrounding the tooth portion 12 between the distal-side limiting portion 13a and the proximal-side limiting portion 13 b.
As shown in fig. 3 and 4, the insulator 13 has an outer edge region 13E in which the thickness decreases stepwise toward the near end portion, as viewed in the direction of the axis X, in the vicinity of the end portion of the back yoke portion 11 of the split yoke 10 in the insulator 13. The outer edge region 13E is formed on the surface of the back yoke portion 11 of the split yoke 10 facing the tooth portion 12.
As shown in fig. 4, the insulator 13 is formed with a thickness of a reference value Ts with respect to the outer surface of the split yoke 10, but the outer edge region 13E is formed such that the thickness is gradually reduced from the reference value Ts to the 1 st and 2 nd wall thickness values T1 and T2 at a position close to the boundary of the outer surface of the split yoke 10. In the insulator 13, inclined surfaces 13s having the same inclination are formed at a boundary between a portion having a thickness of the reference value Ts and a portion having a 1 st wall thickness value T1 and a boundary between a portion having a 1 st wall thickness value T1 and a portion having a 2 nd wall thickness value T2, respectively.
As shown in fig. 6, the insulator 13 is integrated with the split yoke 10 by accommodating and fixing a part of the split yoke 10 in the metal mold 20, filling the molten insulating resin in the metal mold 20, and solidifying the resin. Since the outer edge region 13E is formed when the insulator 13 is integrally formed in this manner, the inner surface of the metal mold 20 is shaped so as to form the reference gap value Gs, the 1 st gap value G1, and the 2 nd gap value G2 between the outer surface of the split yoke 10 and the inner surface of the metal mold 20 in the region corresponding to the outer edge region 13E in the metal mold 20.
The reference gap value Gs (the reference value Ts) is about 0.35mm, the 1 st gap value G1 (the 1 st thickness value T1) is about 0.25mm, and the 2 nd gap value G2 (the 2 nd thickness value T2) is about 0.15 mm. Accordingly, the resistance value in the region of the 1 st gap value G1 is larger than the resistance value when the resin flows in the region of the reference gap value Gs, and the resistance value in the region of the 2 nd gap value G2 is further larger.
In addition, as shown in fig. 7, a space for forming the above-described tip side regulating portion 13a and base side regulating portion 13b is formed in the metal mold 20, in which a gate 21 for filling the molten resin into the metal mold 20 from the outer peripheral portion of the base side regulating portion 13b is formed.
[ formation of insulator by Metal mold ]
Since the mold 20 has the structure shown in fig. 6 and 7, the resin in a molten state filled from the gate 21 flows so as to expand from a region near the gate 21 to a region around the gate in the initial stage of filling. Further, even if the resin is intended to flow into the region of the 1 st gap value G1 at the initial stage of filling, since the resistance acting on the flow of the resin in the region of the 1 st gap value G1 is larger than the resistance when the resin flows in the region of the reference gap value Gs, if there is a region of the reference gap value Gs not filled with the resin inside the metal mold 20, the resin flows in this region first.
Then, after almost all the region where the reference gap value Gs is formed is filled with the resin inside the metal mold 20, the region of the 1 st gap value G1 is filled with the resin, but since the resistance value when the resin flows in the region of the 2 nd gap value G2 is large, the flow of the resin in the 2 nd gap value G2 is suppressed, and the pressure of the resin in this region is also reduced.
Accordingly, a time lag occurs in the interior of the mold 20 from the start of resin filling to the time when the resin is filled into the region of the 1 st gap value G1 and the 2 nd gap value G2, and not only can a phenomenon in which the high-pressure resin directly flows in be suppressed, but also the pressure of the resin when the resin flows in the region of the 2 nd gap value G2 is greatly reduced, and therefore, a problem that the resin flows out from the end of the 2 nd gap value G2 to the outside and burrs are generated is suppressed.
In particular, the outer edge region 13E is formed in a linear region along the lamination direction of the magnetic steel plates in the vicinity of the end of the back yoke portion 11, and the flow direction of the resin filled from the gate 21 is along the lamination direction of the magnetic steel plates. Therefore, even when the resin filled from the gate 21 flows in the vicinity of the 1 st gap value G1 and the 2 nd gap value G2, the resin flows preferentially in the laminating direction of the magnetic steel sheets, and therefore, the phenomenon that the resin flows to the 1 st gap value G1 and the 2 nd gap value G2 is suppressed, and the generation of burrs is suppressed well.
[ method for manufacturing magnet yoke ]
In manufacturing the yoke Y, as described above, the insulator 13 is formed by accommodating and fixing a part of the split yoke 10 in the metal mold 20 and filling the molten resin in the metal mold 20.
Next, the coil wire 14 is wound around the outer surface of the insulator 13 to form the coil portion C, the plurality of split yokes 10 having the coil portion C formed therein are arranged in a ring shape, and then the split yokes 10 are joined to form the yoke Y.
[ Effect of the embodiment ]
A part of the split yoke 10 formed by laminating magnetic steel plates is accommodated and fixed in the inside of the mold 20, and the inside of the mold 20 is filled with a molten resin and cooled, and then the insulator 13 is firmly and integrally formed on the split yoke 10 taken out from the mold 20. Further, since the outer edge region 13E is formed in the insulator 13 in the vicinity of the end portion of the back yoke portion 11 by setting the inner surface shape of the mold 20, the resin leakage at the end portion is suppressed, and the occurrence of burrs is prevented.
Thus, when the end portions of the back yoke portions 11 of the adjacent split yokes 10 are coupled to each other, a problem that the coupling is hindered by burrs can be eliminated, and for example, the assembling work of the motor can be speeded up without performing a work of removing burrs.
Further, the motor can be easily assembled by the manufacturing method of integrally forming the insulator 13 on the split yoke 10 using the metal mold 20, winding the coil wire 14 on the outer surface of the insulator 13 to form the coil portion C, and disposing the split yoke 10 in a ring shape to manufacture the yoke Y.
[ other embodiments ]
The present invention can be configured as follows, in addition to the above-described embodiments (parts having the same functions as those of the embodiments are denoted by the same reference numerals and symbols as those of the embodiments).
(a) The following structure may be adopted: as shown in fig. 5 and 7, the outer edge region 13E is formed in the rear yoke portion 11 at a position radially close to the outer periphery of the yoke Y with reference to the base end side regulating portion 13b, whereby the occurrence of resin burrs is suppressed at this position.
As shown in fig. 5, the outer edge region 13E of the other embodiment (a) has the same configuration as that of the embodiment, and thus the configuration of the mold 20 is also the same as that of the embodiment as shown in fig. 7.
As shown in the other embodiment (a), by suppressing the occurrence of burrs on the upper and lower surfaces of the back yoke portion 11 in the insulator 13, handling of the split yokes 10 when the yoke Y is formed by a plurality of split yokes 10 becomes easy, and the work of removing burrs is not required.
(b) In the embodiment, the number of steps in the outer edge region 13E is 2, but may be 3 or more. In addition, when a plurality of steps are formed, it is also effective to increase the interval between the steps from the viewpoint of suppressing the generation of burrs, and thus the interval between the steps can be set arbitrarily.
When the number of steps and the interval between steps in the outer edge region 13E are set, it is also possible to consider setting the number to a value that matches the properties such as the flowability of the resin forming the insulator 13.
(c) In the embodiment, a part of the split yoke 10 is fixed inside the mold 20, but the entire split yoke 10 may be fixed inside the mold 20, and the shape and structure of the mold 20 may be other than those shown in the embodiment.
(d) The yoke Y in which the insulator 13 is integrally formed by the metal mold 20 is not limited to the motor, and may be used for a generator.
[ industrial applicability ]
The present invention can be used for a yoke in which an insulator is formed on a split yoke and the split yoke is arranged in a ring shape.
Description of the symbols
10-segment yoke
11 back yoke part
12 tooth part
13 insulator
13E outer edge region
20 metal die
And a Y magnetic yoke.
Claims (4)
1. A yoke is configured by arranging a plurality of split yokes in a ring shape,
the split yoke has:
a back yoke portion integrally formed by laminating a plurality of magnetic steel plates and extending in a circumferential direction of the yoke;
a single tooth portion extending from the back yoke portion in a radial direction of the yoke; and the number of the first and second groups,
an insulator covering a region from the tooth portion to the back yoke portion and formed of an insulating resin,
the insulator has an outer edge region having a thickness that decreases in a stepwise manner as viewed in the axial direction of the yoke, the outer edge region being located closer to an end of the back yoke portion.
2. The magnetic yoke according to claim 1,
the number of the steps formed in the stepped shape is 3 or more.
3. The magnetic yoke according to claim 1 or 2,
the outer edge region is formed over the entire end portion of the back yoke portion in a direction along the axial center of the yoke.
4. A method for manufacturing a yoke in which a plurality of split yokes are arranged in a ring shape,
laminating a plurality of magnetic steel plates to integrally form the split yoke having a back yoke portion extending in a circumferential direction of the yoke and a single tooth portion extending from the back yoke portion in a radial direction of the yoke,
the split yoke is accommodated in a metal mold,
an insulator is formed by filling and solidifying a molten insulating resin into an inner space of the metal mold, and the insulator has an outer edge region in which a thickness decreases stepwise as viewed in an axial direction of the yoke, the outer edge region being located closer to an end of the back yoke portion,
the split yoke formed with the insulator is arranged in a ring shape, and the adjacent back yoke portions are joined to each other.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020-054258 | 2020-03-25 | ||
| JP2020054258A JP7468049B2 (en) | 2020-03-25 | 2020-03-25 | Yoke and method for manufacturing the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113452174A true CN113452174A (en) | 2021-09-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110254613.8A Pending CN113452174A (en) | 2020-03-25 | 2021-03-09 | Yoke and method for manufacturing yoke |
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| Country | Link |
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| JP (1) | JP7468049B2 (en) |
| CN (1) | CN113452174A (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004248471A (en) | 2003-02-17 | 2004-09-02 | Yaskawa Electric Corp | Stator piece and motor stator using the same |
| JP2010136486A (en) | 2008-12-02 | 2010-06-17 | Toyota Motor Corp | Stator structure and method for manufacturing stator |
| JP2016174470A (en) | 2015-03-17 | 2016-09-29 | 三菱電機株式会社 | Armature, manufacturing method of the same, and rotary electric machine |
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2020
- 2020-03-25 JP JP2020054258A patent/JP7468049B2/en active Active
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2021
- 2021-03-09 CN CN202110254613.8A patent/CN113452174A/en active Pending
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| Publication number | Publication date |
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| JP2021158714A (en) | 2021-10-07 |
| JP7468049B2 (en) | 2024-04-16 |
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Address after: Kariya City, Aichi Prefecture, Japan's Asahi 2 chome 1 GA Applicant after: AISIN Co.,Ltd. Address before: Kariya City, Aichi Prefecture, Japan's Asahi 2 chome 1 GA Applicant before: AISIN SEIKI Kabushiki Kaisha |
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