CN110266124B - Stator core and motor - Google Patents
Stator core and motor Download PDFInfo
- Publication number
- CN110266124B CN110266124B CN201910568777.0A CN201910568777A CN110266124B CN 110266124 B CN110266124 B CN 110266124B CN 201910568777 A CN201910568777 A CN 201910568777A CN 110266124 B CN110266124 B CN 110266124B
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- Prior art keywords
- stator
- tooth
- teeth
- axial direction
- motor
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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
- H02K1/145—Stator cores with salient poles having an annular coil, e.g. of the claw-pole type
-
- 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
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2793—Rotors axially facing stators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
- H02K2201/12—Transversal flux machines
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The invention discloses a stator core and a motor, wherein the stator core comprises a stator yoke and a plurality of stator teeth, the plurality of stator teeth are arranged at intervals along the circumferential direction of the stator yoke, the plurality of stator teeth are positioned on one side of the stator yoke along the axial direction, the plurality of stator teeth are divided into a plurality of stator tooth pairs, the minimum distance between two stator teeth in each stator tooth pair is A, the minimum distance between two adjacent stator tooth pairs is B, and A is less than or equal to B. According to the invention, because A is less than or equal to B, the cogging torque of the motor can be reduced, the magnetic leakage between teeth and between tooth pairs can be reduced, and the performance of the motor can be improved.
Description
Technical Field
The invention relates to the technical field of motors, in particular to a stator core and a motor.
Background
With the guidance of government energy-saving policies and the demand of market development, the direct flow of the fan of the household appliance gradually becomes a trend, and the brushless motor adopted in the industry at present is of a radial magnetic field structure (namely, the magnetic field is distributed along the radial direction of a rotor), and the power density of the motor is lower, namely, the material utilization rate is low. Due to the market price rise of motor raw materials, the high-power density motor becomes the development trend of the brushless direct current motor. Axial flux machines are gradually being popularized and applied due to their performance advantages.
Although the axial flux motor has the characteristics of high efficiency and high power density, the magnetic circuit structure of the axial flux motor causes the bottleneck problems of complex production process, winding and the like of the stator punching iron core, and the popularization and the application of the axial flux motor are restricted. Tooth portion along the circumference equipartition of traditional axial motor's stator tooth, the notch of two adjacent stator teeth is the contained angle structure, and the notch in the inboard is little promptly, and the outside notch is big, leads to motor tooth's socket to distribute inhomogeneous and tooth's socket torque big, influences the motor performance.
Disclosure of Invention
The invention aims to provide a stator core and a motor, which can reduce the cogging torque of the motor and improve the performance of the motor.
The technical scheme adopted by the invention is as follows: the stator core comprises a stator yoke and a plurality of stator teeth, wherein the stator teeth are arranged at intervals along the circumferential direction of the stator yoke, the stator teeth are positioned on one side of the stator yoke along the axial direction, the stator teeth are divided into a plurality of stator tooth pairs, the minimum distance between two stator teeth in each stator tooth pair is A, the minimum distance between two adjacent stator tooth pairs is B, and A is less than or equal to B.
One end of each stator tooth is provided with a through groove, the stator yoke is provided with connecting parts with the same number as the stator teeth, and each stator tooth is inserted in the corresponding connecting part through the through groove.
The through groove extends axially toward an end face of the one end of each stator tooth.
The two sides of the through groove are bulges, the two sides of the connecting part are open grooves, and the bulges are inserted into the open grooves.
The protrusion extends in the axial direction, an open groove on one side of the connecting portion extends in the radial direction to the outer side face of the stator yoke, and an open groove on the other side of the connecting portion extends in the radial direction to the inner side face of the stator yoke.
Each stator tooth comprises a tooth part extending along the axial direction and a tooth shoe part arranged at one end of the tooth part along the axial direction, the tooth shoe part extends along the direction perpendicular to the axial direction, the tooth part extends out of two ends of the tooth shoe part, and the through groove is arranged at the other end of the tooth part along the axial direction.
Two stator teeth in each stator tooth pair are radially symmetrical.
The invention also provides a motor which comprises the stator core.
The motor further comprises a rotor, and the rotor is arranged on one side, close to the tooth shoe portion, of the stator tooth in the axial direction.
The rotor includes magnetic conductive disc and permanent magnet, the permanent magnet is located tooth boots portion with between the magnetic conductive disc.
The permanent magnet is a magnetic ring or a magnetic shoe.
The stator core adopts a stator yoke and stator tooth separation structure, the stator yoke is laminated along the axial direction, the stator teeth are laminated along the radial direction, and the motor performance and the power density are improved by adopting an axial and radial mixed combined stator core technology; and the stator yoke laminates along the axial direction, and the stator tooth laminates along radial direction, through both cooperations, realizes stator core's simplified production (traditional axial motor, stator core need adopt circumference to wind, is the technical bottleneck at present in the technology, because the iron core girth of every round of wound-type iron core all is inequality, is difficult to realize to processes implementation such as cell type structure, size). In addition, the groove type of the traditional axial magnetic field iron core is distributed in a radial mode, automatic winding and production cannot be achieved, the stator yoke and the stator teeth are in a separated structure, winding can not be affected by the iron core structure, independent winding can be achieved, the wound windings are installed on the corresponding stator teeth, and the winding process and the current technical bottleneck are greatly simplified. Because A is less than or equal to B, the cogging torque of the motor can be reduced, the magnetic leakage between teeth and between tooth pairs can be reduced, and the performance of the motor can be improved.
Drawings
Fig. 1 is a structural view of a motor in an embodiment of the present invention.
Fig. 2 is an exploded view of a motor in an embodiment of the present invention.
Fig. 3 is a schematic view of the stator yoke and the stator teeth separated in the embodiment of the present invention.
Fig. 4 is a structural view of stator teeth in the embodiment of the present invention.
Fig. 5 is a structural view of a stator yoke in the embodiment of the present invention.
Fig. 6 is a plan view of the stator yoke coupled to the stator teeth in an embodiment of the present invention.
Fig. 7 is a side structural view of the motor in the embodiment of the present invention.
Detailed Description
As shown in fig. 1 and 2, the motor proposed in the embodiment of the present invention is an axial flux motor, and includes a stator including a stator core and a stator winding 3, and a rotor 4. The stator core comprises a stator yoke 1 and a plurality of stator teeth 2, and stator windings 3 are wound on the stator teeth 2. In the figure, the direction X represents the axial direction and the direction Y represents the radial direction.
The circumferential direction, the axial direction and the radial direction in the following all refer to the circumferential direction of the stator yoke, the axial direction of the stator yoke and the radial direction of the stator yoke, and are defined as the circumferential direction of the stator yoke, the axial direction of the stator yoke and the radial direction of the stator yoke of the conventional motor.
The stator yoke 1 is formed by a plurality of stator yoke punching sheets which are stacked along the axial direction, each stator tooth 2 is formed by a plurality of stator tooth punching sheets which are stacked along the radial direction and have the same shape, the plurality of stator teeth 2 are arranged at intervals along the circumferential direction of the stator yoke 1, and the plurality of stator teeth 2 are positioned on one side of the stator yoke 1 along the axial direction. The motor performance and power density are improved by adopting a stator yoke and stator tooth separation structure, wherein the stator yoke is laminated along the axial direction, the stator teeth are laminated along the radial direction, and the motor performance and power density are improved by adopting an axial and radial mixed combined stator core technology; and the stator yoke laminates along the axial direction, and the stator tooth laminates along radial direction, through both cooperations, realizes stator core's simplified production (traditional axial motor, stator core need adopt circumference to wind, is the technical bottleneck at present in the technology, because the iron core girth of every round of wound-type iron core all is inequality, is difficult to realize to processes implementation such as cell type structure, size). In addition, the groove type of the traditional axial magnetic field iron core is distributed in a radial mode, automatic winding and production cannot be achieved, the stator yoke and the stator teeth are in a separated structure, winding can not be affected by the iron core structure, independent winding can be achieved, the wound windings are installed on the corresponding stator teeth, and the winding process and the current technical bottleneck are greatly simplified.
As shown in fig. 3, in order to easily control the height of the stator teeth during installation, a through slot 211 is provided at one end of each stator tooth 2, the stator yoke 1 is provided with connecting portions 11 equal in number to the number of the stator teeth 2, and each stator tooth 2 is inserted into the corresponding connecting portion 11 through the through slot 211. Because the depth of the through groove can be preset, the inserting depth is easy to control when the through groove is inserted into the connecting part, and the height of the stator teeth during installation is easy to control.
In this embodiment, there are 12 stator teeth, each stator tooth is provided with a through groove, the corresponding stator yoke is provided with 12 connecting portions, and each through groove corresponds to one connecting portion.
In this embodiment, the plurality of stator teeth are divided into a plurality of stator tooth pairs, each stator tooth pair is composed of two stator teeth, two stator teeth in each stator tooth pair are radially symmetrical, and two stator teeth in each stator tooth pair are arranged close to each other.
As shown in fig. 4 and 5, the through groove 211 extends axially toward the end face of one end of each stator tooth 2, the protrusions 212 are provided on both sides of the through groove 211, and the protrusions 212 extend axially, so that the through groove 211 and the protrusions 212 on both sides of the through groove 211 form a "concave" structure. The two sides of the connecting portion 22 are provided with open grooves 12, the protrusions 212 are inserted into the open grooves 12, the open groove 12 on one side of the connecting portion 11 extends to the outer side surface of the stator yoke 1 along the radial direction, the open groove 12 on the other side of the connecting portion 11 extends to the inner side surface of the stator yoke 1 along the radial direction, and thus the connecting portion 11 and the open grooves 12 on the two sides of the connecting portion 11 form an I-shaped structure. In this embodiment, the connecting portion 11 is a square block, and the connecting portion 11 is flush with the stator yoke 1 along two axial end faces. The concave structure and the I-shaped structure connect the stator yoke with the stator teeth to realize the magnetic circuit communication of the stator yoke and the stator teeth.
As shown in fig. 2 to 4, each stator tooth 2 includes a tooth portion 21 extending in the axial direction and a tooth shoe portion 22 provided at one end of the tooth portion 21 in the axial direction, the tooth shoe portion 22 extends in a direction perpendicular to the axial direction, both ends of the tooth shoe portion 22 extend out of the tooth portion 21, and a through groove 211 is provided at the other end of the tooth portion 21 in the axial direction. The axial end surface of the tooth shoe 22 is flat, and the two sides of the tooth shoe 22 are rounded.
The teeth and the teeth shoes of the two stator teeth in each stator tooth pair are parallel, and the distance between the two stator teeth in each stator tooth pair is the same.
As shown in fig. 6, the minimum distance between two stator teeth 2 in each stator tooth pair 5 is a, the minimum distance between two adjacent stator tooth pairs 5 is B, and a is not more than B, so that the cogging torque of the motor can be reduced, the inter-tooth space and inter-tooth flux leakage can be reduced, and the motor performance can be improved. Preferably, a = B, is most effective.
The included angle β =360 °/stator tooth pair of the arc corresponding to each stator tooth pair.
The stator yoke 1 is a regular polygon (the number of sides of the regular polygon = the number of the stator tooth pairs, and the number of the sides of the regular polygon is an integral multiple of 2), one stator tooth pair 5 is provided on each side of the stator yoke 1, the radius of the inscribed circle of the stator yoke 1 is H, and the width of the tooth shoe portion of each stator tooth pair is L, and L satisfies the following formula:
generally, A = B is preferred, and a value of L between 0.5 and 1mm is most preferred.
As shown in fig. 1 and 2, the rotor 4 is disposed on one side of the stator teeth 2 close to the tooth shoe portion 22 along the axial direction, the rotor 4 includes a magnetic conductive disk 41 and a permanent magnet 42, the permanent magnet 42 is a magnetic ring or a magnetic shoe, and the permanent magnet 42 is disposed between the tooth shoe portion 22 and the magnetic disk 41.
As shown in fig. 7, the permanent magnet 42 faces the tooth shoe portion 22, and the surfaces of the permanent magnet 42 and the tooth shoe portion 22 facing each other are parallel planes, that is, the permanent magnet 42 and the tooth shoe portion 22 are equal-height air gaps δ in the axial direction, the equal-height air gaps can ensure that the cogging torque and the torque ripple of the motor are smaller, and at the same time, can ensure that the performance of the motor is higher, mainly in order to ensure the performance of the motor and also improve the stability and reliability of the operation of the motor.
The permanent magnet 42 is magnetized sinusoidally in the axial direction, each pole is a sector, the angle of the sector is alpha, alpha =360 °/2P (2P is the number of poles of the motor), and the polarities of two adjacent sectors are opposite.
The number of slots of each pole and each phase of the motor is q, the number of slots of the motor is Z, the number of poles of the motor is 2P, the number of phases of the motor is m, and the motor meets the following formula:
the stator yoke may be of a unitary construction, a straight bar construction, and a split-block construction. The number of stator slots and the number of poles of the motor are preferably even.
The installation process of the motor comprises the following steps: the punching sheets are laminated into stator teeth and a stator yoke by a stamping die; winding the annular concentrated winding by using winding equipment; sleeving each pair of windings on the tooth part of each stator tooth pair respectively;
sequentially mounting each stator tooth pair on a corresponding stator yoke and fixing; the stator is formed by adopting the processes of injection molding, encapsulation and the like for solidification; adhering the magnetic ring or the fan-shaped magnetic shoe to the magnetic disc by using glue or injecting plastics such as nylon and the like into the magnetic ring or the magnetic steel and the magnetic conductive disc to form an integrated rotor; and assembling the rotor on the corresponding position of the stator to form the motor.
The above specific embodiments are only intended to illustrate the inventive concept and many modifications and variations may be made by those skilled in the art within the spirit of the invention, which are included within the scope of the invention.
Claims (10)
1. The stator core comprises a stator yoke (1) and a plurality of stator teeth (2), wherein the stator teeth (2) are arranged at intervals along the circumferential direction of the stator yoke (1), the stator teeth (2) are located on one side of the stator yoke (1) along the axial direction, the stator teeth (2) are divided into a plurality of stator tooth pairs, and the stator core is characterized in that the stator yoke (1) is in a regular polygon shape, the minimum distance between two stator teeth (2) in each stator tooth pair is A, the minimum distance between two adjacent stator tooth pairs is B, and A is not more than B.
2. A stator core according to claim 1, characterized in that one end of each stator tooth (2) is provided with a through slot (211), the stator yoke (1) is provided with a number of connections (11) equal to the number of stator teeth (2), and each stator tooth (2) is inserted through the through slot (211) onto the corresponding connection (11).
3. A stator core according to claim 2, characterized in that the through slot (211) extends axially towards an end face of the one end of each stator tooth (2).
4. The stator core according to claim 3, wherein the through slot (211) is provided with protrusions (212) at two sides, the connecting portion (11) is provided with an open slot (12) at two sides, and the protrusions (212) are inserted into the open slot (12).
5. Stator core according to claim 4, characterized in that the protrusions (212) extend in axial direction, the open slot (12) of one side of the connection portion (11) extending in radial direction towards the outer side of the stator yoke (1), the open slot (12) of the other side of the connection portion (11) extending in radial direction towards the inner side of the stator yoke (1).
6. The stator core according to claim 2, wherein each stator tooth (2) comprises a tooth portion (21) extending in the axial direction and a tooth shoe portion (22) provided at one end of the tooth portion (21) in the axial direction, the tooth shoe portion (22) extends in a direction perpendicular to the axial direction, both ends of the tooth shoe portion (22) extend out of the tooth portion (21), and the through groove (211) is provided at the other end of the tooth portion (21) in the axial direction.
7. An electric machine comprising the stator core of claim 6.
8. An electric machine according to claim 7, characterized in that the electric machine further comprises a rotor (4), which rotor (4) is provided on the side of the stator teeth (2) in the axial direction near the tooth shoe (22).
9. The machine according to claim 8, characterized in that the rotor (4) comprises a magnetically permeable disc (41) and a permanent magnet (42), the permanent magnet (42) being located between the tooth shoe (22) and the magnetically permeable disc (41).
10. The machine according to claim 9, characterized in that the permanent magnets (42) are magnetic rings or tiles.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910568777.0A CN110266124B (en) | 2019-06-27 | 2019-06-27 | Stator core and motor |
| PCT/CN2019/125363 WO2020258758A1 (en) | 2019-06-27 | 2019-12-13 | Stator core and motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910568777.0A CN110266124B (en) | 2019-06-27 | 2019-06-27 | Stator core and motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110266124A CN110266124A (en) | 2019-09-20 |
| CN110266124B true CN110266124B (en) | 2021-06-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910568777.0A Active CN110266124B (en) | 2019-06-27 | 2019-06-27 | Stator core and motor |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN110266124B (en) |
| WO (1) | WO2020258758A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110266124B (en) * | 2019-06-27 | 2021-06-25 | 珠海凯邦电机制造有限公司 | Stator core and motor |
| CN112850372A (en) * | 2021-01-05 | 2021-05-28 | 顾珍莹 | Prevent broken line type self-interacting weaving yarn section of thick bamboo |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009095088A (en) * | 2007-10-04 | 2009-04-30 | Honda Motor Co Ltd | Axial gap motor |
| CN205231872U (en) * | 2015-12-04 | 2016-05-11 | 新安乃达驱动技术(上海)有限公司 | Servo motor's novel stator and servo motor |
| CN208142940U (en) * | 2018-03-05 | 2018-11-23 | 哈尔滨理工大学 | A kind of surface-mounted permanent magnet machine stator structure that stator rabbet is not wide |
| CN109302027A (en) * | 2018-10-31 | 2019-02-01 | 淮安威灵电机制造有限公司 | Transverse flux motor |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3375080A1 (en) * | 2015-11-11 | 2018-09-19 | Gordon Ritchie | Axial flux electric machine |
| CN208674969U (en) * | 2018-08-10 | 2019-03-29 | 广东威灵电机制造有限公司 | Motor stator and motor |
| CN109301948A (en) * | 2018-10-31 | 2019-02-01 | 淮安威灵电机制造有限公司 | Transverse flux motor |
| CN110138112A (en) * | 2019-06-27 | 2019-08-16 | 珠海凯邦电机制造有限公司 | Improve the motor of cogging torque stability |
| CN110266124B (en) * | 2019-06-27 | 2021-06-25 | 珠海凯邦电机制造有限公司 | Stator core and motor |
| CN110266125A (en) * | 2019-06-27 | 2019-09-20 | 珠海凯邦电机制造有限公司 | Stator core and motor |
-
2019
- 2019-06-27 CN CN201910568777.0A patent/CN110266124B/en active Active
- 2019-12-13 WO PCT/CN2019/125363 patent/WO2020258758A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009095088A (en) * | 2007-10-04 | 2009-04-30 | Honda Motor Co Ltd | Axial gap motor |
| CN205231872U (en) * | 2015-12-04 | 2016-05-11 | 新安乃达驱动技术(上海)有限公司 | Servo motor's novel stator and servo motor |
| CN208142940U (en) * | 2018-03-05 | 2018-11-23 | 哈尔滨理工大学 | A kind of surface-mounted permanent magnet machine stator structure that stator rabbet is not wide |
| CN109302027A (en) * | 2018-10-31 | 2019-02-01 | 淮安威灵电机制造有限公司 | Transverse flux motor |
Non-Patent Citations (1)
| Title |
|---|
| 槽口宽度对伺服永磁电机齿槽转矩的影响研究;陈硕等;《湖南工业大学学报》;20190531;16-20 * |
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| Publication number | Publication date |
|---|---|
| CN110266124A (en) | 2019-09-20 |
| WO2020258758A1 (en) | 2020-12-30 |
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