CN114448116A - Stator suitable for closed slot induction motor - Google Patents
Stator suitable for closed slot induction motor Download PDFInfo
- Publication number
- CN114448116A CN114448116A CN202210111986.4A CN202210111986A CN114448116A CN 114448116 A CN114448116 A CN 114448116A CN 202210111986 A CN202210111986 A CN 202210111986A CN 114448116 A CN114448116 A CN 114448116A
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- CN
- China
- Prior art keywords
- stator
- stator core
- motor
- closed slot
- induction motor
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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.)
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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
-
- 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
Abstract
The invention discloses a stator suitable for a closed slot induction motor, which relates to the technical field of motors and comprises a stator core, wherein: the stator core is provided with stator slots, the stator core is provided with through holes along the axial direction of the stator core, the inner wall of each through hole is provided with a plurality of cambered surfaces protruding towards the direction close to the axial line of the stator core, and the plurality of cambered surfaces are distributed along the circumferential direction of the stator core; the structure of the through hole of the stator core is changed, so that the amplitude of the magnetic conductance harmonic wave of the air gap of the motor is reduced; meanwhile, the sine degree of the air gap flux density of the motor is optimized, and the harmonic amplitude of a first-order tooth of the stator is reduced; thereby reducing stray loss caused by stator tooth harmonic waves; the overall efficiency of the motor is improved. The invention has simple structure, obvious effect of reducing stray loss and wide universality.
Description
Technical Field
The invention relates to the technical field of motors, in particular to a stator suitable for a closed slot induction motor.
Background
At present, induction motors are widely used, and low-loss high-efficiency motors are always the targets pursued by people. Due to the influence of the working environment, a closed slot is adopted by part of motors. The losses of the motor are mainly divided into iron losses, electrical losses, mechanical losses and stray losses. Among them, the loss caused by the tooth harmonics occupies most of the stray loss, and the reduction of the stray loss by reducing the tooth harmonics is one of the methods for improving the efficiency of the motor. As shown in fig. 1, a conventional stator core has a circular through-hole.
Disclosure of Invention
Therefore, the invention aims to provide a stator suitable for a closed slot induction motor, so that the amplitude of a first-order tooth harmonic wave of the stator is effectively reduced, the stray loss generated by the corresponding motor tooth harmonic wave is reduced, the total loss of the motor is further reduced, and the efficiency of the motor is increased.
The purpose of the invention is realized by the following technical scheme:
a stator suitable for use in a closed slot induction machine comprising a stator core, wherein:
the stator core is provided with a plurality of stator slots, the stator slots are distributed along the circumferential direction of the stator core, and preferably, the stator slots are closed slots;
the stator core is provided with a through hole along the axial direction, and a rotor in the prior art is sleeved in the through hole;
the inner wall of the through hole is provided with a plurality of cambered surfaces protruding towards the direction close to the axis of the stator iron core, and the plurality of cambered surfaces are distributed along the circumferential direction of the stator iron core and are preferably uniformly distributed on the stator iron core;
preferably, the arc surface is an equal-diameter arc surface, that is, the section of the arc surface along the radial direction of the stator core is an arc, and the radii of the arc surface along arcs with any sections are equal;
preferably, the plurality of arc surfaces have the same structure, that is, the radius of the plurality of arc surfaces is equal to the corresponding central angle.
As a further optimization scheme of the invention, any two adjacent cambered surfaces are connected through a connecting line along the axial line direction of the stator iron core, that is, a plurality of cambered surfaces are sequentially connected end to form the inner wall of the through hole, a groove is formed between any two adjacent cambered surfaces, and further the number of equivalent stator slots is increased to improve the performance of the motor.
As a further optimization scheme of the invention, the number of the closed slots is equal to that of the cambered surfaces, and one cambered surface is opposite to one closed slot.
As a further optimization scheme of the invention, the center line of the cambered surface is positioned on the central surface of the stator slot, namely the middle part of the stator slot is opposite to the middle part of the cambered surface, the closed slot and the cambered surface form a connecting part, and the thickness of the connecting part opposite to the cambered surface is minimum. The arc forming the stator inner diameter has the smallest value of the stator inner diameter at the corresponding position in the middle of the stator slot.
The invention has the beneficial effects that: the stator suitable for the closed slot induction motor provided by the invention reduces the amplitude of the magnetic conductance harmonic wave of the air gap of the motor by changing the structure of the through hole of the stator core; meanwhile, the sine degree of the air gap flux density of the motor is optimized, and the harmonic amplitude of a first-order tooth of the stator is reduced; thereby reducing stray loss caused by stator tooth harmonic waves; the overall efficiency of the motor is improved. The invention has simple structure, obvious effect of reducing stray loss and wide universality.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a schematic diagram of a prior art stator core of an electrical machine;
FIG. 2 is a schematic structural view of the present invention;
FIG. 3 is an enlarged view of portion A of FIG. 2;
FIG. 4 shows harmonic amplitudes of air gap flux density stator and rotor teeth of a closed slot motor with a stator having a uniform inner diameter and a stator having a non-uniform inner diameter, wherein the abscissa of the figure shows the number of the air gap flux density harmonic;
fig. 5 shows stray losses and total losses of a closed slot motor with a stator having a uniform inner diameter and a stator having a non-uniform inner diameter.
In the figure 1: a stator core; 2: a closed slot; 3: a through hole; a, local; b, the maximum point of the inner diameter of the stator core; c, the minimum point of the inner diameter of the stator core.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
as shown in fig. 1, for a stator core structure in the prior art, the inner diameter of the stator of the motor with uniform inner diameter of the stator is a complete circumference, the outer diameter of the stator of the motor in this embodiment is 400mm, the inner diameter of the stator is 225mm, the height of the notch of the stator closed slot is 1mm, the width of the notch is 8.8mm, the height of the slot is 55mm, the width of the slot bottom is 12.4mm, and the stator core is opened with 36 closed slots.
As shown in fig. 2 to 3, the present invention provides a stator suitable for a closed slot induction motor, which has a non-uniform inner diameter, comprising a stator core 1, the stator core 1 is provided with 36 closed slots 2 along the radial direction, the 36 closed slots 2 are evenly distributed on the stator core, the structure of the closed slots 2 is the same as the size of the stator closed slots in figure 1, the stator core 1 is provided with a through hole 3, the inner wall of the through hole 3 is formed by connecting a plurality of cambered surface structures, the cambered surface is a cambered surface which is convex towards the direction close to the axis of the stator core 1, any two adjacent cambered surfaces are directly connected with each other, the number of the cambered surfaces is 36, one cambered surface is opposite to one closed slot 2, the cambered surfaces are equal-diameter cambered surfaces, the center line of the cambered surface is positioned on the central surface of the closed slot, the middle part of the cambered surface is opposite to the middle part of the closed slot, and the distance from the middle part of the cambered surface to the axis of the stator core 1 is the minimum;
the cross section of the cambered surface along the radial direction of the stator core 1 is in a circular arc shape, the distance from the connecting part of any two adjacent cambered surfaces to the axis of the stator core 1 is the largest at the position corresponding to the middle point of each tooth of the stator, for example, the distance from the B point to the axis of the stator core 1 in fig. 3 is 227mm, the distance from the middle part of the cambered surface to the axis of the stator core 1 is the smallest, for example, the distance from the C point to the axis of the stator core 1 in fig. 3 is 224 mm.
As shown in fig. 4, constant torque simulation was performed for the stator structure in the present embodiment (the stator structure shown in fig. 2 to 3) and the stator structure in the prior art (the stator structure in fig. 1), and the rotors matched with the stators were general rotors, the outer diameter of the rotor was 223mm, and the inner diameter of the rotor was 85 mm. Finite element software for motors with two different stator structures is simulated, output torque is set to 667Nm, and amplitude of corresponding harmonic waves can be obtained by performing Fourier decomposition on air gap flux density in a simulation result. 17, 19 times of harmonic waves are first-order tooth harmonic waves of a motor stator, 35, 37 times of harmonic waves are second-order tooth harmonic waves of the motor stator, 20, 22 times of harmonic waves are first-order tooth harmonic waves of a motor rotor, and compared with a stator closed slot motor with uniform inner diameter, the amplitude of the first-order stator tooth harmonic waves of the air gap magnetic density of the stator closed slot motor with non-uniform inner diameter is greatly reduced, and the amplitude of the second-order stator tooth harmonic waves and the amplitude of the first-order rotor tooth harmonic waves are slightly increased;
as shown in fig. 5, the stray loss and the total loss of the two motors are obtained by using finite element software, and it can be seen that compared with the inner diameter uniform stator closed slot motor, the stray loss and the total loss of the inner diameter non-uniform stator closed slot motor are greatly reduced by 1615W and 1489W, respectively, that is, the motor efficiency is improved by 1.4%. The stator closed slot motor with uneven inner diameter improves the sine property of air gap flux density because of reducing the harmonic amplitude of the first-order teeth of the stator, reduces the loss of the motor and improves the efficiency.
It should be noted that the stator with non-uniform inner diameter in fig. 4 and 5 is the stator with the structure shown in fig. 2 to 3 in the present embodiment, and the stator with uniform inner diameter indicated in fig. 4 and 5 is the stator in the prior art shown in fig. 1.
Claims (7)
1. A stator suitable for a closed slot induction motor, comprising: comprising a stator core, wherein:
the stator core is also provided with a plurality of stator slots, and the plurality of stator slots are circumferentially distributed on the stator core;
the stator core is provided with a through hole along the axial direction;
the inner wall of the through hole is provided with a plurality of cambered surfaces protruding towards the direction close to the axis of the stator iron core, and the plurality of cambered surfaces are circumferentially distributed in the through hole.
2. The stator for a closed slot induction motor according to claim 1, wherein: the stator slots are closed slots.
3. The stator for a closed slot induction motor according to claim 1, wherein: the cambered surface is an equal-diameter cambered surface.
4. The stator for a closed slot induction motor according to claim 1, wherein: any two adjacent cambered surfaces are connected through a connecting line.
5. The stator for a closed slot induction motor according to any one of claims 1-4, wherein: the number of the cambered surfaces is the same as that of the stator slots.
6. The stator for a closed slot induction motor according to claim 5, wherein: one arc face is opposed to one stator slot.
7. The stator for a closed slot induction motor according to claim 6, wherein: the center line of the cambered surface is positioned on the center plane of the stator slot.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210111986.4A CN114448116A (en) | 2022-01-27 | 2022-01-27 | Stator suitable for closed slot induction motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210111986.4A CN114448116A (en) | 2022-01-27 | 2022-01-27 | Stator suitable for closed slot induction motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114448116A true CN114448116A (en) | 2022-05-06 |
Family
ID=81370885
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210111986.4A Pending CN114448116A (en) | 2022-01-27 | 2022-01-27 | Stator suitable for closed slot induction motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114448116A (en) |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006288042A (en) * | 2005-03-31 | 2006-10-19 | Toshiba Corp | Permanent magnet type motor |
| JP2006288043A (en) * | 2005-03-31 | 2006-10-19 | Toshiba Corp | Permanent magnet type motor |
| CN201163741Y (en) * | 2008-02-01 | 2008-12-10 | 薛肇江 | Brushless electric machine used for oil fuel pump |
| CN203967847U (en) * | 2014-06-26 | 2014-11-26 | 广东威灵电机制造有限公司 | Stator core and there is the motor of this stator core |
| CN104348268A (en) * | 2013-08-09 | 2015-02-11 | 德昌电机(深圳)有限公司 | Single-phase brushless motor |
| CN108832737A (en) * | 2018-07-16 | 2018-11-16 | 珠海格力电器股份有限公司 | Motor stator punching, motor stator, motor |
| KR20200026622A (en) * | 2018-09-03 | 2020-03-11 | 엘지이노텍 주식회사 | Motor |
| CN212304898U (en) * | 2020-07-20 | 2021-01-05 | 金路达集团有限公司 | Stator core |
| CN213521426U (en) * | 2020-11-30 | 2021-06-22 | 安徽美芝精密制造有限公司 | Motor, compressor and refrigeration plant |
| CN113328542A (en) * | 2020-02-28 | 2021-08-31 | 福特全球技术公司 | Motor stator |
| CN215646416U (en) * | 2021-06-02 | 2022-01-25 | 浙江捷昌线性驱动科技股份有限公司 | Low-noise lifting stand column |
-
2022
- 2022-01-27 CN CN202210111986.4A patent/CN114448116A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006288042A (en) * | 2005-03-31 | 2006-10-19 | Toshiba Corp | Permanent magnet type motor |
| JP2006288043A (en) * | 2005-03-31 | 2006-10-19 | Toshiba Corp | Permanent magnet type motor |
| CN201163741Y (en) * | 2008-02-01 | 2008-12-10 | 薛肇江 | Brushless electric machine used for oil fuel pump |
| CN104348268A (en) * | 2013-08-09 | 2015-02-11 | 德昌电机(深圳)有限公司 | Single-phase brushless motor |
| CN203967847U (en) * | 2014-06-26 | 2014-11-26 | 广东威灵电机制造有限公司 | Stator core and there is the motor of this stator core |
| CN108832737A (en) * | 2018-07-16 | 2018-11-16 | 珠海格力电器股份有限公司 | Motor stator punching, motor stator, motor |
| KR20200026622A (en) * | 2018-09-03 | 2020-03-11 | 엘지이노텍 주식회사 | Motor |
| CN113328542A (en) * | 2020-02-28 | 2021-08-31 | 福特全球技术公司 | Motor stator |
| CN212304898U (en) * | 2020-07-20 | 2021-01-05 | 金路达集团有限公司 | Stator core |
| CN213521426U (en) * | 2020-11-30 | 2021-06-22 | 安徽美芝精密制造有限公司 | Motor, compressor and refrigeration plant |
| CN215646416U (en) * | 2021-06-02 | 2022-01-25 | 浙江捷昌线性驱动科技股份有限公司 | Low-noise lifting stand column |
Non-Patent Citations (1)
| Title |
|---|
| 陈垒;张程;鲍晓华;: "不均匀气隙结构的异步起动永磁同步电机设计", 微电机 * |
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