CN111492560A - Stator and motor having the same - Google Patents
Stator and motor having the same Download PDFInfo
- Publication number
- CN111492560A CN111492560A CN201780096540.6A CN201780096540A CN111492560A CN 111492560 A CN111492560 A CN 111492560A CN 201780096540 A CN201780096540 A CN 201780096540A CN 111492560 A CN111492560 A CN 111492560A
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- CN
- China
- Prior art keywords
- core
- stator
- back yoke
- surface side
- core plate
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/14—Stator cores with salient poles
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/16—Stator cores with slots for windings
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The stator includes a stator core and a coil. The stator core is formed by laminating a plurality of annular first iron core plates and an annular second iron core plate. The first core plate and the second core plate each have a plurality of core pieces divided in the circumferential direction, and are formed into an annular shape by abutting end portions of back yoke portions of adjacent core pieces. The first core plate has, between ends of adjacent back yoke sections: a notch portion forming a gap from an inner surface side to a middle portion in a radial direction; and a close contact part for abutting the end of the back yoke part from the intermediate part to the outer surface side. The second core plate has a contact portion where the ends of the adjacent back yoke portions are butted from the inner surface side to the outer surface side in the radial direction.
Description
Technical Field
The present invention relates to a stator and a motor including the stator.
Background
A motor used in a compressor or the like is configured by an annular stator and a rotor rotatably provided inside the stator as disclosed in patent document 1, for example. The stator is provided with: a stator core having an annular back yoke portion and a plurality of teeth portions protruding inward from the back yoke portion; and a coil wound around the tooth portion of the stator core. The stator core is formed by stacking a plurality of annular core plates. The core plate has a plurality of core pieces divided in the circumferential direction, and the end portions of back yoke portions of adjacent core pieces are butted to form an annular shape.
Patent document 1: japanese patent laid-open publication No. 2013-42620
When the motor is assembled to the compressor, the stator is held by shrink fitting on an inner surface of the hermetic container forming an outer shell of the compressor. If the stator is configured such that the end portions of the adjacent back yoke portions abut against each other from the inner surface side toward the radial direction to the outer surface side and are in close contact with each other, the stress may increase due to the end portions of the back yoke portions abutting against each other when the stator is shrink-fitted to the inner surface of the closed casing, and the iron loss may increase.
On the other hand, the stator is provided with a gap between the end portions of the adjacent back yoke portions from the inner surface side to the outer surface side in the radial direction, so that the end portions of the back yoke portions can be prevented from abutting against each other when the stator is subjected to shrink fit with the inner surface of the closed casing, and thus, the iron loss can be prevented. However, if a gap is provided from the inner surface side to the outer surface side in the radial direction of the stator, the rigidity is lowered, and therefore, the fastening force with the sealed container is lowered, which may increase noise of the compressor. The fastening force refers to the shedding load and the holding torque.
Disclosure of Invention
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a stator and a motor including the stator, which can suppress an increase in noise of a compressor by preventing a decrease in rigidity while suppressing an increase in iron loss caused by the end portions of a back yoke portion coming into contact with each other when the stator is shrink-fitted to the inner surface of a closed container.
The stator according to the present invention includes: a stator core having an annular back yoke portion and a plurality of teeth portions protruding inward from the back yoke portion; and a coil wound around a tooth portion of the stator core, wherein the stator core is formed by laminating a plurality of annular first core plates and an annular second core plate, each of the first core plates and the second core plates has a plurality of core pieces divided in a circumferential direction, and ends of the back yoke portions of the adjacent core pieces are butted to form an annular shape, and the first core plate has: a notch portion forming a gap from an inner surface side to a middle portion in a radial direction; and a close contact portion that makes the end portions of the back yoke portions abut against each other from the intermediate portion to the outer surface side, and the second core plate has a close contact portion that makes the end portions of the adjacent back yoke portions abut against each other from the inner surface side toward the outer surface side in the radial direction.
According to the present invention, since the portion where the magnetic flux is particularly concentrated in the first core plate, that is, the portion extending from the inner surface side to the intermediate portion in the radial direction is formed as the notch portion, stress can be suppressed by the notch portion when the stator is press-fitted to the inner surface of the sealed container, and iron loss can be suppressed. Further, since the stress of the close contact portion can be increased by providing the first core plate with the notch portion and contracting the outer diameter, the rigidity of the close contact portion can be increased. Since the young's modulus increases with the increase in rigidity, the fastening force between the stator and the hermetic container can be increased, and the noise of the compressor can be suppressed.
Drawings
Fig. 1 is a vertical sectional view showing a schematic configuration of a hermetic compressor including a motor including a stator according to an embodiment of the present invention.
Fig. 2 is a plan view showing a stator core of a stator according to an embodiment of the present invention.
Fig. 3 is a vertical cross-sectional view schematically showing a portion of the stator core of the stator according to the embodiment of the present invention, in which the first core plate has the cutout portion.
Fig. 4 is a vertical cross-sectional view schematically showing a portion of the stator core of the stator according to the embodiment of the present invention, in which the first core plate has the contact portion.
Fig. 5 is an enlarged view of a main part showing a connection portion of the first core plate of the stator according to the embodiment of the present invention.
Fig. 6 is an enlarged view of a main part showing a connection portion of the second core plate of the stator according to the embodiment of the present invention.
Fig. 7 is an enlarged view of a main portion showing a connecting portion of the first core plate in the conventional stator core.
Fig. 8 is an enlarged view of a main portion showing a connecting portion of the second core plate in the conventional stator core.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding portions are denoted by the same reference numerals, and description thereof will be omitted or simplified as appropriate. The shape, size, arrangement, and the like of the structures shown in the drawings can be appropriately changed within the scope of the present invention.
Provided is an implementation mode.
Fig. 1 is a vertical sectional view showing a schematic configuration of a hermetic compressor including a motor including a stator according to an embodiment of the present invention. Fig. 2 is a plan view showing a stator core of a stator according to an embodiment of the present invention. Fig. 3 is a vertical cross-sectional view schematically showing a portion of the stator core of the stator according to the embodiment of the present invention, in which the first core plate has the cutout portion. Fig. 4 is a vertical cross-sectional view schematically showing a portion of the stator core of the stator according to the embodiment of the present invention, in which the first core plate has the contact portion. Fig. 1 shows a cylinder type rotary compressor as an example of a closed compressor 100. The sealed compressor 100 accommodates a compression element 2 for compressing a refrigerant gas and an electric element 3 for driving the compression element 2 in a sealed container 1.
The closed casing 1 is composed of a bottomed cylindrical lower casing 10 and an upper casing 11 covering an upper opening of the lower casing 10 in a closed state. Inside the lower container 10, a compression member 2 is provided on the lower side, and an electric member 3 is provided on the upper side. The compression element 2 and the electric element 3 are coupled to each other by a crankshaft 12, and the rotational motion of the electric element 3 is transmitted to the compression element 2. The compression element 2 compresses the refrigerant gas by the transmitted rotational force, and discharges the refrigerant gas into the closed casing 1. That is, the inside of the closed casing 1 is filled with the compressed high-temperature and high-pressure refrigerant gas. Refrigerating machine oil for lubricating the compression element 2 is stored in the lower portion of the closed casing 1, that is, in the bottom portion of the lower casing 10.
The compression element 2 is constituted by a cylinder block 20, a rotary piston 21, a main bearing 22, a sub-bearing 23, a discharge muffler 24, a vane (not shown), and the like.
The cylinder 20 includes a cylinder chamber having a compression chamber and a suction chamber therein. A suction connection pipe 25 through which a suction gas from the refrigeration cycle passes through a suction muffler 26 is connected to the cylinder block 20. The cylinder chamber is open at both axial ends.
The rotary piston 21 eccentrically rotates in the cylinder chamber. The rotary piston 21 is annular, and the inner periphery thereof is slidably fitted to the eccentric shaft portion 12a of the crankshaft 12. That is, the compression element 2 is configured such that the rotary piston 21 fitted to the eccentric shaft portion 12a of the crankshaft 12 is housed in the cylinder chamber, and one end of a vane reciprocating in the radial direction in a groove provided in the cylinder 20 abuts against the outer periphery of the rotary piston 21 to form a compression chamber.
The main bearing 22 slidably fits the main shaft portion 12b of the crankshaft 12 and closes one opening of the cylinder chamber of the cylinder block 20. A discharge muffler 24 is attached to the main bearing 22. The high-temperature and high-pressure exhaust gas discharged from the discharge valve of the main bearing 22 enters the discharge muffler 24, and is discharged into the sealed container 1 from the discharge hole 24a of the discharge muffler 24. The sub-bearing 23 slidably fits the sub-shaft portion 12c of the crankshaft 12 and closes the other opening of the cylinder chamber of the cylinder 20.
The electric component 3 is an electric motor including an annular stator 4 and a rotor 8 rotatably provided inside the stator 4. As an example, the electric member 3 is constituted by a brushless DC motor.
The stator 4 is constituted by a stator core 5 and a coil 7. As shown in fig. 2, the stator core 5 includes an annular back yoke 50 and a plurality of teeth 51 protruding inward from the back yoke 50. As shown in fig. 3 and 4, the stator core 5 is formed by alternately laminating a plurality of first core plates 5A and second core plates 5B, and the first core plates 5A and the second core plates 5B are formed by punching thin electromagnetic steel sheets. The stator core 5 is formed with an outer diameter larger than an inner diameter of the middle portion of the lower container 10, and is fixed to the inner surface of the lower container 10 by shrink fitting.
The first core plate 5A has a plurality of core pieces 6 divided in the circumferential direction, and is configured to have an annular shape by abutting the end portions of the back yoke portions 50 of the adjacent core pieces 6. Similarly, the second core plate 5B has a plurality of core pieces 6 divided in the circumferential direction, and is configured to have an annular shape by abutting the end portions of the back yoke portions 50 of the adjacent core pieces 6. The core pieces 6 of the first iron core plate 5A and the core pieces 6 of the second iron core plate 5B are rotatably connected by the rotating shaft 52.
Fig. 5 is an enlarged view of a main part showing a connection portion of the first core plate of the stator according to the embodiment of the present invention. Fig. 6 is an enlarged view of a main part showing a connection portion of the second core plate of the stator according to the embodiment of the present invention. As shown in fig. 5, the first core plate 5A has, between the ends of the adjacent back yoke portions 50: a notch 60 having a gap formed from the inner surface side to the middle in the radial direction; and a close-contact portion 61 for abutting the end of the back yoke portion 50 from the intermediate portion to the outer surface side. On the other hand, as shown in fig. 6, the second core plate 5B has a close-contact portion 62 in which the end portions of the adjacent back yoke portions 50 are butted from the inner surface side to the outer surface side in the radial direction.
The portion where the notch 60 is provided, that is, the portion extending from the inner surface side to the middle portion in the radial direction is a portion where magnetic flux concentrates inside the stator 4 when the stator 4 is thermally press-fitted to the sealed container 1. On the other hand, the portion where the contact portion 61 is provided, that is, the portion from the intermediate portion to the outer surface side is a portion where the magnetic flux is not concentrated in the stator 4 when the stator 4 is thermally press-fitted to the sealed container 1. The portion where the magnetic flux is not concentrated is, for example, a range from the outer surface side of the stator 4 to about 2mm in the radial direction. The portion where the magnetic flux is concentrated ranges from a position radially exceeding about 2mm from the outer surface side of the stator 4 to the inner surface side, for example.
The coil 7 is wound around the tooth 51 of the stator core 5 via the insulating member 70. As shown in fig. 1, a lead wire 71 for applying a voltage to flow a current is connected to the coil 7. The lead wire 71 is connected to the glass terminal 13 provided in the upper container 11 and receives power supply from the outside of the sealed container 1.
The rotor 8 includes a rotor core 80, a permanent magnet 81, an upper weight 82, a lower weight 83, and rivets 84. The rotor core 80 is formed by laminating a plurality of core plates, which are formed by punching thin electromagnetic steel sheets. The permanent magnet 81 is inserted into a magnet insertion hole formed in the rotor core 80.
The upper weight 82 is disposed at an upper end portion of the rotor core 80. The lower weight 83 is disposed at the lower end portion of the rotor core 80. The upper balancer 82 and the lower balancer 83 are provided to correct a deviation of a rotational motion of the rotor 8 caused by a displacement of a rotational torque in a compression process such as suction, compression, and discharge of the refrigerant gas by the compression element 2. The upper weight 82 and the lower weight 83 also serve as end plates for preventing the permanent magnets 81 from scattering. The upper weight 82 and the lower weight 83 may be different components from the end plates.
Fig. 7 is an enlarged view of a main portion showing a connecting portion of the first core plate in the conventional stator core. Fig. 8 is an enlarged view of a main portion showing a connecting portion of the second core plate in the conventional stator core. The conventional stator core also includes an annular back yoke 50 and a plurality of teeth 51 protruding inward from the back yoke 50. The stator core is formed by alternately laminating a plurality of annular first iron core plates 5C and annular second iron core plates 5D.
The first core plate 5C and the second core plate 5D each have a plurality of core pieces 6 divided in the circumferential direction, and are formed in an annular shape by abutting end portions of the back yoke portions 50 of the adjacent core pieces 6. As shown in fig. 7, the first core plate 5C has a gap 63 between the end portions of the adjacent back yoke portions 50 from the inner surface side to the outer surface side in the radial direction. As shown in fig. 8, the second core plate 5D has a close-contact portion 64 in which the end portions of the adjacent back yoke portions 50 are butted from the inner surface side to the outer surface side in the radial direction.
In the stator including the stator core shown in fig. 7 and 8, since the gap 63 is provided in the first core plate 5C, when the outer surface of the stator is press-fitted to the inner surface of the sealed container 1, the stress increase due to the end portions of the back yoke portion 50 coming into contact with each other can be suppressed, and the iron loss can be reduced. However, if the gap 63 is provided from the inner surface side toward the radial direction to the outer surface portion as in the stator including the conventional stator core shown in fig. 7 and 8, the iron loss can be reduced, but the rigidity of the stator may be reduced. Therefore, the fastening force between the stator and the hermetic container 1 is reduced, and the noise of the hermetic compressor may increase.
On the other hand, in the stator 4 according to the present embodiment, since the notch 60 is formed at the portion where the magnetic flux is concentrated in the first core plate 5A, that is, from the inner surface side to the middle portion in the radial direction, the notch 60 can suppress stress and iron loss at the time of hot press-fitting with the inner surface of the sealed container 1. Further, since the stator 4 can increase the stress of the close contact portion 61 by providing the first core plate 5A with the notch 60 and contracting the outer diameter, the rigidity of the close contact portion 61 can be increased. Since the young's modulus increases with the increase in rigidity, the fastening force to the hermetic container 1 can be increased, and noise of the hermetic compressor 100 can be suppressed. Further, since the stator 4 is provided with the contact portion 61 from the intermediate portion to the outer surface side, which is a portion where the internal magnetic flux is not concentrated, even if stress is generated in the contact portion 61 at the time of the shrink fitting, deterioration of the magnetic properties of the electromagnetic steel plates due to the stress can be suppressed, and iron loss can be suppressed. Further, since the second core plate 5B of the stator 4 has the close contact portion 62 in which the end portions of the adjacent back yoke portions 50 are butted from the inner surface side to the outer surface side in the radial direction, the rigidity in the lamination direction can be increased and the roundness on the inner diameter side can be increased, thereby stabilizing the structure.
In the stator 4 according to the present embodiment, the stator core 5 is formed by alternately laminating a plurality of first core plates 5A and second core plates 5B, and thus the above-described operational effects of the first core plates 5A and the above-described operational effects of the second core plates 5B can be exhibited in a balanced and effective manner.
The present invention has been described above based on the embodiments, but the present invention is not limited to the configurations of the above embodiments. For example, the cylinder type rotary compressor is shown as the hermetic compressor 100 as an example, but a compressor having another structure may be used. The sealed compressor 100 is not limited to the illustrated configuration, and may include other members. The stator core 5 is configured by alternately stacking a plurality of first core plates 5A and second core plates 5B, but the stator core is not limited to this. For example, 1 second core plate 5B may be arranged every 2 first core plates 5A. In summary, the statement is complemented in case: the scope of various modifications, applications, and uses that can be accomplished by those skilled in the art as needed is also included in the gist (technical scope) of the present invention.
Description of reference numerals:
1 … sealing the container; 2 … compression member; 3 … electric element (motor); 4 … stator; 5 … stator core; 5A, 5C … a first core plate; 5B, 5D … second iron core plate; 6 … core sheet; 7 … coil; 8 … rotor; 10 … lower container; 11 … an upper container; 12 … crankshaft; 12a … eccentric shaft portion; 12b … main shaft portion; 12c … minor axis portion; 13 … glass terminals; 20 … cylinders; 21 … rotary piston; 22 … main bearing; 23 … secondary bearing; 24 … discharge muffler; 24a … outlet orifice; 25 … suction connecting tube; 26 … suction muffler; 50 … back yoke; 51 … tooth portion; 52 … a rotating shaft portion; 60 … cut-out portion; 61. 62 … sealing part; 63 … gap; 64 … sealing connection part; 70 … insulating members; 71 … a wire; 80 … a rotor core; 81 … permanent magnet; 82 …; 83 … lower counterbalance; 84 … rivets; 100 … hermetic compressor.
Claims (3)
1. A stator is characterized by comprising:
a stator core having an annular back yoke portion and a plurality of teeth portions protruding inward from the back yoke portion; and
a coil wound around a tooth portion of the stator core,
the stator core is formed by laminating a plurality of annular first iron core plates and annular second iron core plates,
the first core plate and the second core plate each have a plurality of core pieces divided in a circumferential direction, and are formed into an annular shape by abutting end portions of the back yoke portions of the adjacent core pieces,
the first core plate has, between ends of the adjacent back yoke sections: a notch portion forming a gap from an inner surface side to a middle portion in a radial direction; and a close contact section for abutting the end of the back yoke section from the intermediate section to the outer surface side,
the second core plate has a joint portion at which ends of the adjacent back yoke portions are butted from an inner surface side toward a radial direction to an outer surface side.
2. The stator according to claim 1,
the stator core is formed by alternately laminating a plurality of the first core plates and the second core plates.
3. An electric motor, characterized in that,
the motor is provided with the stator according to claim 1 or 2 and a rotor rotatably provided inside the stator.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2017/045525 WO2019123531A1 (en) | 2017-12-19 | 2017-12-19 | Stator and electric motor provided with stator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111492560A true CN111492560A (en) | 2020-08-04 |
Family
ID=66994478
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201780096540.6A Pending CN111492560A (en) | 2017-12-19 | 2017-12-19 | Stator and motor having the same |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPWO2019123531A1 (en) |
| KR (1) | KR20200081427A (en) |
| CN (1) | CN111492560A (en) |
| CZ (1) | CZ2020314A3 (en) |
| WO (1) | WO2019123531A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114142633A (en) * | 2021-12-03 | 2022-03-04 | 广东美芝制冷设备有限公司 | Stator, motor, compressor and refrigeration plant |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007141907A1 (en) * | 2006-06-05 | 2007-12-13 | Mitsubishi Electric Corporation | Split type iron core and its manufacturing method, and stator iron core |
| CN101523696A (en) * | 2006-10-13 | 2009-09-02 | 株式会社三井高科技 | Laminated iron core, and its manufacturing method |
| JP2011120392A (en) * | 2009-12-04 | 2011-06-16 | Mitsubishi Electric Corp | Stator core, stator, motor, and compressor |
| US20110258840A1 (en) * | 2008-12-09 | 2011-10-27 | Toyota Jidosha Kabushiki Kaisha | Method of manufacturing a stator |
| JP2013042620A (en) * | 2011-08-18 | 2013-02-28 | Hitachi Automotive Systems Ltd | Rotary electric machine |
| WO2017033229A1 (en) * | 2015-08-21 | 2017-03-02 | 三菱電機株式会社 | Permanent magnet-embedded motor, compressor, and refrigerating and air conditioning device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011254625A (en) * | 2010-06-02 | 2011-12-15 | Aisin Seiki Co Ltd | Rotary electric machine |
| JP5531841B2 (en) * | 2010-07-23 | 2014-06-25 | Ｊｆｅスチール株式会社 | Electric motor |
-
2017
- 2017-12-19 KR KR1020207015192A patent/KR20200081427A/en not_active Ceased
- 2017-12-19 CN CN201780096540.6A patent/CN111492560A/en active Pending
- 2017-12-19 WO PCT/JP2017/045525 patent/WO2019123531A1/en active Application Filing
- 2017-12-19 CZ CZ2020-314A patent/CZ2020314A3/en unknown
- 2017-12-19 JP JP2019559895A patent/JPWO2019123531A1/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007141907A1 (en) * | 2006-06-05 | 2007-12-13 | Mitsubishi Electric Corporation | Split type iron core and its manufacturing method, and stator iron core |
| CN101523696A (en) * | 2006-10-13 | 2009-09-02 | 株式会社三井高科技 | Laminated iron core, and its manufacturing method |
| US20110258840A1 (en) * | 2008-12-09 | 2011-10-27 | Toyota Jidosha Kabushiki Kaisha | Method of manufacturing a stator |
| JP2011120392A (en) * | 2009-12-04 | 2011-06-16 | Mitsubishi Electric Corp | Stator core, stator, motor, and compressor |
| JP2013042620A (en) * | 2011-08-18 | 2013-02-28 | Hitachi Automotive Systems Ltd | Rotary electric machine |
| WO2017033229A1 (en) * | 2015-08-21 | 2017-03-02 | 三菱電機株式会社 | Permanent magnet-embedded motor, compressor, and refrigerating and air conditioning device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114142633A (en) * | 2021-12-03 | 2022-03-04 | 广东美芝制冷设备有限公司 | Stator, motor, compressor and refrigeration plant |
| CN114142633B (en) * | 2021-12-03 | 2023-01-06 | 广东美芝制冷设备有限公司 | Stator, motor, compressor and refrigeration plant |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20200081427A (en) | 2020-07-07 |
| JPWO2019123531A1 (en) | 2020-08-06 |
| CZ2020314A3 (en) | 2020-07-29 |
| WO2019123531A1 (en) | 2019-06-27 |
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| PB01 | Publication | ||
| PB01 | Publication | ||
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Application publication date: 20200804 |