CN110266126B - Stator core, stator, motor and air conditioner - Google Patents
Stator core, stator, motor and air conditioner Download PDFInfo
- Publication number
- CN110266126B CN110266126B CN201910654509.0A CN201910654509A CN110266126B CN 110266126 B CN110266126 B CN 110266126B CN 201910654509 A CN201910654509 A CN 201910654509A CN 110266126 B CN110266126 B CN 110266126B
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- stator
- tooth
- side wall
- yoke
- stator core
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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
- H02K1/146—Stator cores with salient poles consisting of a generally annular yoke 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
- H02K1/165—Shape, form or location of the slots
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The invention provides a stator core, a stator, a motor and an air conditioner. The stator core comprises a yoke portion, a plurality of tooth portions and a plurality of shoe portions, the tooth portions are evenly arranged along the circumferential direction of the yoke portion, one end, away from the yoke portion, of each tooth portion is provided with one shoe portion, the yoke portion, two adjacent tooth portions and the shoe portions located on the two adjacent tooth portions enclose stator slots, and each stator slot is symmetrically arranged by taking a radial line of a stator as a central axis. The stator slot comprises a first side wall, the first side wall is located on the tooth portion, and an included angle between the first side wall and a central axis of the corresponding stator slot is larger than 0 degree and smaller than or equal to 15 degrees. The stator core can improve the utilization rate of the slot area and the rigidity of the stator.
Description
Technical Field
The invention relates to the technical field of motors, in particular to a stator core, a stator, a motor and an air conditioner.
Background
With the improvement of the energy efficiency standard of the air conditioner and the development trend of the miniaturization of the air conditioner compressor, the outer diameter of the motor is required to be smaller and the height of the motor is required to be lower for the compressor with the same working efficiency, and in order to realize the miniaturization and the high efficiency of the motor, the power density of the motor is required to be improved, and a larger rotor is required to be placed with more permanent magnets for providing energy. Although can arrange through magnet steel V type and increase the permanent magnet quantity under the unchangeable circumstances of rotor external diameter, nevertheless for improving product competitiveness, when the motor volume is further miniaturized, the rotor was arranged and has been close the limit, then need provide bigger magnet steel through the increase rotor external diameter and arrange the space.
When the outer diameter of the motor is reduced and the outer diameter of the rotor is unchanged or increased, the volume of the stator part is necessarily reduced correspondingly, as shown in fig. 1, the stator structure of the motor is in the prior art, and in order to avoid increasing copper loss, the area of the stator slot 101 needs to be kept unchanged, and the width of the tooth part 102 and the width of the yoke part 103 of the motor need to be reduced, so that the rigidity of the stator is weakened, and the vibration noise is increased. According to the stator stiffness expression:
where Km is the stator stiffness and h is the yoke thickness, the stator stiffness is proportional to the third power of the yoke 103 thickness, it can be seen that a reduction in the width of the yoke 103 results in a significant increase in vibration noise.
In the prior art, a conductor with a rectangular section or an approximate rectangular section is adopted to replace a conventional conductor with a circular section so as to improve the slot filling rate, but the available area of a stator slot is greatly reduced, and meanwhile, a conductor winding cannot be sufficiently fixed in the slot, so that the performance of a motor is deteriorated. And the rectangular section conductor is unconventional material, needs to adopt special coiling equipment to wind, and the technology degree of difficulty is big.
Disclosure of Invention
A first object of the present invention is to provide a stator core that can improve the slot area utilization rate and can improve the stator rigidity.
A second object of the present invention is to provide a stator having the above stator core.
A third object of the present invention is to provide an electric machine having the above-described stator.
A fourth object of the present invention is to provide an air conditioner having the above motor.
In order to achieve the first object, the stator core provided by the invention comprises a yoke portion, a plurality of tooth portions and a plurality of shoe portions, wherein the tooth portions are uniformly arranged along the circumferential direction of the yoke portion, one shoe portion is arranged at one end, away from the yoke portion, of each tooth portion, the yoke portion, two adjacent tooth portions and the shoe portions on the two adjacent tooth portions enclose stator slots, and each stator slot is symmetrically arranged by taking a radial line of a stator as a central axis. The stator slot comprises a first side wall, the first side wall is located on the tooth portion, and an included angle between the first side wall and a central axis of the corresponding stator slot is larger than 0 degree and smaller than or equal to 15 degrees.
It is thus seen that by the above-mentioned scheme, it is little to set the width of the one end that is close to the boots portion through tooth portion, and the width of the one end that is close to yoke portion is big, makes the shape of stator slot roughly be the rectangle to make the design of stator slot more laminate the wire winding characteristics of arranging, improve groove area utilization, guarantee that motor performance improves stator core's rigidity simultaneously, be favorable to realizing the effect of the high-efficient low noise of motor.
Preferably, the teeth are located inside the yoke, and a width of an end of the teeth near the shoe is smaller than a width of an end of the teeth near the yoke.
Further, the width of the tooth portion gradually increases from the end close to the shoe portion to the end close to the yoke portion in the radial direction of the stator core.
It can be seen that the tooth part has increased rigidity due to the increased connection surface between the tooth part and the yoke part.
Preferably, the teeth are located outside the yoke, and a width of an end of the teeth near the shoe is larger than a width of an end of the teeth near the yoke.
In a preferred embodiment, the tooth portion includes a first tooth section and a second tooth section arranged along a radial direction of the stator core, each of the first tooth section and the second tooth section has an isosceles trapezoid or a rectangle shape in a cross section perpendicular to an axial direction of the stator, and the second tooth section has an isosceles trapezoid shape in a cross section perpendicular to the axial direction of the stator.
Preferably, the stator slot further comprises a second side wall, the first side wall is located on the first tooth segment, the second side wall is located on the second tooth segment, and an included angle between the second side wall and a central axis of the corresponding stator slot is smaller than or equal to 15 degrees.
Further, the included angle between the first side wall and the second side wall is an obtuse angle.
Preferably, the shoe portion, the first tooth segment, the second tooth segment, and the yoke portion are connected in this order, and a ratio of a length of the second tooth segment in the radial direction of the stator to a length of the tooth portion in the radial direction of the stator is greater than or equal to 0.3.
Preferably, the ratio of the maximum width of the tooth to the maximum width of the stator slot is in the range of 0.5 to 1.
Therefore, when the width of the tooth part is too large, the width of the stator slot is correspondingly reduced, the slot area is reduced, and the copper loss of the motor is increased. The magnetic density saturation degree of the tooth part is increased along with the reduction of the width of the tooth part, when the width of the tooth part is too small, the magnetic density of the tooth part is too saturated, the load carrying capacity of the motor is reduced, the iron loss is increased, and the efficiency is reduced.
Preferably, the ratio of the minimum width of the teeth to the arc length of the boot is greater than 0.3.
Therefore, when the ratio of the minimum width of the tooth part to the arc length of the shoe part is less than 0.3, the magnetic flux of the tooth part is greatly reduced, so that the load carrying capacity of the motor is seriously reduced, and the efficiency of the motor is reduced. Meanwhile, the rigidity of the joint of the stator tooth part and the boot part is weakened, and the tooth part can vibrate greatly under the action of tangential force, so that the integral vibration of the motor is increased. And the ratio of the minimum width of the tooth part to the arc length of the boot part is more than 0.3, so that the rigidity of the joint of the tooth part and the boot part can be ensured, and the magnetic flux of the tooth part is improved.
Preferably, the stator slot further comprises a third side wall, the third side wall is located on the yoke portion, the third side wall is a planar wall, and an included angle between the third side wall and a central axis of the corresponding stator slot is within a range of 75 degrees to 105 degrees.
Therefore, compared with the curved wall adopted by the existing stator core, the thickness of the yoke part is increased by 20%, the rigidity of the stator yoke part is improved by 70%, and the vibration of the stator is favorably inhibited, so that the noise of the motor is reduced.
Preferably, the stator slot further comprises a fourth side wall, the fourth side wall is located on the yoke, and the fourth side wall is a curved wall.
Preferably, the stator slot further comprises a fifth sidewall, the fifth sidewall being located on the shoe, the fifth sidewall being angled within a range of 75 degrees to 105 degrees from a central axis of the corresponding stator slot.
Preferably, the plurality of teeth are arranged along an outer peripheral wall of the yoke, and a width of an end of the teeth near the shoe is larger than a width of an end of the teeth near the yoke.
In order to achieve the second object, the stator provided by the invention comprises a stator core and a stator winding, wherein the stator core is the stator core, and the stator winding is wound on the tooth part and is positioned in the stator slot.
In order to achieve the third object, the present invention provides a motor including the stator.
In order to achieve the fourth object, the present invention provides an air conditioner including the motor.
Drawings
Fig. 1 is a schematic structural view of a conventional stator.
Fig. 2 is a schematic view of a first embodiment of a stator core and stator winding of the present invention.
Fig. 3 is a partially enlarged view of a portion a in fig. 2.
Fig. 4 is a schematic structural view of a second embodiment of a stator core of the present invention.
Fig. 5 is a partially enlarged view at B in fig. 4.
Fig. 6 is a schematic structural view of a stator core according to a third embodiment of the present invention.
Fig. 7 is a schematic view of a stator core fourth embodiment and a stator winding structure according to the present invention.
The invention is further explained with reference to the drawings and the embodiments.
Detailed Description
Stator core and first stator embodiment
Referring to fig. 2, the stator of the present embodiment includes a stator core 1 and a stator winding 10, the stator core is formed by laminating stator laminations, the stator core 1 includes a yoke portion 11, nine tooth portions and nine shoe portions, the nine tooth portions are uniformly arranged along the circumferential direction of the yoke portion 11, and the tooth portions are located on the inner side of the yoke portion 11, one end of each tooth portion, which is far away from the shoe portion, is provided with one shoe portion, the yoke portion 11, two adjacent tooth portions 12 and 13, and shoe portions 16 and 17 located on two adjacent tooth portions jointly enclose a stator slot 14, and each stator slot 14 is symmetrically arranged by using a radial line of the stator as a central axis 15. The stator winding 10 is wound on each tooth and is located in the stator slot 14.
Referring to fig. 3, the stator slot 14 includes a side wall 141, a side wall 142, a side wall 143, a side wall 144, and a side wall 145, the side wall 141 being located on the tooth portion 12, the side wall 142 being located on the yoke portion 11, the side wall 143 being located on the second tooth portion 13, the side wall 144 being located on the second shoe portion 17, and the side wall 145 being located on the first shoe portion 16. The connecting part between two adjacent side walls is in smooth transition connection through a chamfer, so that the service life of the die for pressing the punching sheet can be prolonged.
The side wall 141 extends along the axial direction of the stator, the shape of the cross section of the stator slot 14 perpendicular to the axial direction of the stator is approximately rectangular, the side wall 141 is approximately parallel to the central axis 15 of the corresponding stator slot, and the included angle between the side wall 141 and the central axis 15 is greater than 0 degree and smaller than or equal to 15 degrees.
The tooth 12 has a width that gradually increases from an end near the shoe 16 to an end near the yoke 11 along a radial direction of the stator core 1. The ratio b1/l1 of the minimum width b1 of the tooth 12 to the arc length l1 of the boot 16 is greater than 0.3. The ratio b2/w1 of the maximum width b2 of the tooth 12 to the maximum width w1 of the stator slot 14 is in the range of 0.5 to 1.
The side walls 142 are planar walls and the angle between the side walls 142 and the central axis 15 of the corresponding stator slot 14 is in the range of 75 to 105 degrees. In other embodiments, the sidewall 142 may also be a curved wall, which may be a single curvature curved wall or a multiple curvature curved wall, or a combination of planar walls, or a combination of planar and curved walls.
The included angle between the sidewall 144 and the central axis 15 of the corresponding stator slot 14 is 75 degrees to 105 degrees, and the sidewall 145 and the sidewall 144 are symmetrically arranged with the central axis 15 of the corresponding stator slot 14 as the center.
The cross section of the stator winding 10 may be any one of circular, rectangular, rounded rectangular, chamfered rectangular, and polygonal.
From top to bottom, it is little through the width that sets tooth portion to the one end that is close to the boots portion, and the width that is close to the one end of yoke portion is big, makes the shape of stator slot roughly be the rectangle to the design that makes the stator slot more laminates the wire winding and arranges characteristics, improves the groove area utilization ratio, guarantees that motor performance improves stator core's rigidity simultaneously, is favorable to realizing the effect of the high-efficient low noise of motor. Compared with the prior art, the utilization rate of the groove area is improved to 80 percent from 73.6 percent. Meanwhile, the side wall 142 of the stator slot is a plane wall, compared with the existing curved wall yoke part, the thickness of the stator slot is increased by 20%, the rigidity of the stator yoke part is improved by 70%, and the stator slot is beneficial to inhibiting the vibration of the stator, so that the noise of the motor is reduced.
Stator core and stator second embodiment
As a description of the second embodiment of the stator core and the stator according to the present invention, only the differences from the first embodiment of the stator core and the stator will be described below.
Referring to fig. 4 and 5, the tooth portion 21 of the present embodiment includes a first tooth segment 211 and a second tooth segment 212 arranged along a radial direction of the stator core 2, the shoe portion 23, the first tooth segment 211, the second tooth segment 212, and the yoke portion 22 are connected in this order, and the first tooth segment 211 and the second tooth segment 212 each have an isosceles trapezoid shape in a cross section perpendicular to an axial direction of the stator. The first tooth section 211 and the second tooth section 212 are arranged at the same side at the connection position, that is, at the connection position of the first tooth section 211 and the second tooth section 212, the width of the first tooth section 211 is equal to the width of the second tooth section 212 and is overlapped with each other.
The stator slot 24 includes a side wall 241 and a side wall 242, which are connected to each other, the side wall 241 is located on the first tooth section 211, the side wall 242 is located on the second tooth section 212, an included angle θ between the side wall 241 and a central axis 25 of the corresponding stator slot 24 is greater than 0 degree and less than or equal to 15 degrees, the side wall 242 extends along an axial direction of the stator and is disposed parallel to the central axis 25 of the corresponding stator slot 24, that is, the included angle θ between the side wall 242 and the central axis 25 of the corresponding stator slot 24 is 0 degree. In addition, the included angle α between the side wall 241 and the side wall 242 is an obtuse angle, that is, the first tooth section 211 and the second tooth section 212 of the tooth part are recessed in the direction away from the stator slot 24 at the connection position. The junction of the side wall 241 and the side wall 242 is smoothly and transitionally connected by a chamfer.
The ratio l2/l3 of the length l2 of the second tooth segment 212 in the radial direction of the stator to the length l3 of the tooth 21 in the radial direction of the stator is greater than or equal to 0.3.
The tooth parts 21 are connected in multiple stages, so that the minimum width of the tooth parts 21 is too small, the local saturation degree of the magnetic flux of the tooth parts 21 is prevented from being increased, and the load carrying capacity of the motor is prevented from being influenced.
The angle θ between the side wall 242 and the central axis 25 of the corresponding stator slot 24 may be greater than 0 degrees and less than or equal to 15 degrees. Alternatively, the included angle θ between the sidewall 241 and the central axis 25 of the corresponding stator slot 24 is less than or equal to 15 degrees, and the included angle θ between the sidewall 242 and the central axis 25 of the corresponding stator slot 24 is greater than 0 degree and less than or equal to 15 degrees.
Stator core and stator third embodiment
As an explanation of the third embodiment of the stator core and the stator according to the present invention, only differences from the above-described second embodiment of the stator core and the stator will be explained below.
Referring to fig. 6, in the present embodiment, the first tooth section 311 has a rectangular shape in a cross section perpendicular to the axial direction of the stator, and the second tooth section 312 has an isosceles trapezoid shape in a cross section perpendicular to the axial direction of the stator. The first tooth section 311 is disposed coterminous with the second tooth section 312 at the junction.
Stator core and stator fourth embodiment
As an explanation of the fourth embodiment of the stator core and the stator according to the present invention, only differences from the third embodiment of the stator core and the stator will be explained below.
Referring to fig. 7, the tooth 41 is located outside the yoke 42, and a width w2 of an end of the tooth 41 near the shoe 43 is greater than a width w3 of an end of the tooth 41 near the yoke 42. The yoke 42, the first tooth section 411, the second tooth section 412, and the shoe 43 are connected in this order.
The number of stator slots may be 6 or more. The tooth may also include more than two tooth segments arranged in a radial direction of the stator core.
Motor embodiment
The motor of the present embodiment includes the stator in each of the above embodiments.
Air conditioner embodiment
The air conditioner of the embodiment comprises the motor in the motor embodiment.
Finally, it should be emphasized that the above-described preferred embodiments of the present invention are merely examples of implementations, not limitations, and various changes and modifications may be made by those skilled in the art, without departing from the spirit and scope of the invention, and any changes, equivalents, improvements, etc. made within the spirit and scope of the present invention are intended to be embraced therein.
Claims (13)
1. The stator core comprises a yoke part, a plurality of tooth parts and a plurality of shoe parts, the tooth parts are uniformly arranged along the circumferential direction of the yoke part, one end, away from the yoke part, of each tooth part is provided with one shoe part, the yoke part, two adjacent tooth parts and the shoe parts on the two adjacent tooth parts enclose stator slots, and each stator slot is symmetrically arranged by taking a radial line of the stator core as a central axis;
the method is characterized in that:
the stator slot comprises a first side wall, the first side wall is positioned on the tooth part, and an included angle between the first side wall and a central axis corresponding to the stator slot is greater than 0 degree and less than or equal to 15 degrees;
the stator slot further comprises a third side wall, the third side wall is located on the yoke, the yoke is annular, two opposite sides of the third side wall in the circumferential direction of the yoke are respectively connected with two adjacent tooth parts, and the third side wall is a plane wall to increase the thickness of the yoke;
an acute angle between the third side wall and a central axis corresponding to the stator slot is greater than or equal to 75 degrees and smaller than 90 degrees; or the third side wall is perpendicular to the central axis of the corresponding stator slot;
the ratio of the minimum width of the tooth to the arc length of the shoe is greater than 0.3, and the ratio of the maximum width of the tooth to the maximum width of the stator slot is in the range of 0.5 to 1.
2. The stator core of claim 1, wherein:
the tooth portion is located inside the yoke portion, and a width of one end of the tooth portion close to the shoe portion is smaller than a width of one end of the tooth portion close to the yoke portion.
3. The stator core of claim 2, wherein:
the tooth portion has a width gradually increasing from an end near the shoe portion to an end near the yoke portion in a radial direction of the stator core.
4. The stator core of claim 1, wherein:
the tooth portion is located outside the yoke portion, and the width of one end of the tooth portion close to the shoe portion is larger than the width of one end of the tooth portion close to the yoke portion.
5. The stator core according to any one of claims 1 to 4, wherein:
the tooth portion includes a first tooth section and a second tooth section arranged in a radial direction of the stator core, the first tooth section has an isosceles trapezoid or a rectangular shape in a cross section perpendicular to an axial direction of the stator, and the second tooth section has an isosceles trapezoid shape in a cross section perpendicular to the axial direction of the stator.
6. The stator core of claim 5, wherein:
the stator slot further comprises a second side wall connected with the first side wall, the first side wall is located on the first tooth section, the second side wall is located on the second tooth section, and an included angle between the second side wall and a central shaft corresponding to the stator slot is smaller than or equal to 15 degrees.
7. The stator core of claim 6, wherein:
the included angle between the first side wall and the second side wall is an obtuse angle.
8. The stator core of claim 5, wherein:
the shoe portion, the first tooth segment, the second tooth segment, and the yoke portion are connected in this order, and a ratio of a length of the second tooth segment in a radial direction of the stator to a length of the tooth portion in the radial direction of the stator is greater than or equal to 0.3.
9. The stator core according to any one of claims 1 to 4, wherein:
the stator slot further includes a fourth sidewall, the fourth sidewall being located on the yoke, the fourth sidewall being a curved wall.
10. The stator core according to any one of claims 1 to 4, wherein:
the stator slot further comprises a fifth side wall, the fifth side wall is located on the boot portion, and an included angle between the fifth side wall and a central axis corresponding to the stator slot is within a range of 75 degrees to 105 degrees.
11. The stator comprises a stator core and a stator winding, wherein the stator core is the stator core as claimed in any one of claims 1 to 10, and the stator winding is wound on the tooth part and located in the stator slot.
12. An electrical machine comprising a stator according to claim 11.
13. An air conditioner characterized by comprising the motor of claim 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910654509.0A CN110266126B (en) | 2019-07-19 | 2019-07-19 | Stator core, stator, motor and air conditioner |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910654509.0A CN110266126B (en) | 2019-07-19 | 2019-07-19 | Stator core, stator, motor and air conditioner |
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| CN110266126A CN110266126A (en) | 2019-09-20 |
| CN110266126B true CN110266126B (en) | 2021-10-01 |
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| CN201910654509.0A Active CN110266126B (en) | 2019-07-19 | 2019-07-19 | Stator core, stator, motor and air conditioner |
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Families Citing this family (1)
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| WO2023097912A1 (en) * | 2021-12-03 | 2023-06-08 | 威灵（芜湖）电机制造有限公司 | Stator structure, motor, and electrical equipment |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003319576A (en) * | 2002-04-19 | 2003-11-07 | Toyoda Mach Works Ltd | Stator for motor |
| JP2016111731A (en) * | 2014-12-02 | 2016-06-20 | 多摩川精機株式会社 | Resolver |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5253789B2 (en) * | 2007-11-05 | 2013-07-31 | 株式会社ミツバ | Brushless motor |
| JP2011087373A (en) * | 2009-10-14 | 2011-04-28 | Railway Technical Res Inst | Induction motor |
| CN103415979B (en) * | 2011-03-08 | 2016-10-26 | 松下电器产业株式会社 | The stator of motor and motor |
| CN204794394U (en) * | 2015-07-07 | 2015-11-18 | 广东威灵电机制造有限公司 | Stator core , stator and motor |
| CN109638991A (en) * | 2018-11-30 | 2019-04-16 | 南通大学 | The punching of high-voltage permanent magnet synchronous motor stator and wound stator and motor |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003319576A (en) * | 2002-04-19 | 2003-11-07 | Toyoda Mach Works Ltd | Stator for motor |
| JP2016111731A (en) * | 2014-12-02 | 2016-06-20 | 多摩川精機株式会社 | Resolver |
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