CN218040940U - Motor stator for improving air gap magnetic field distribution and permanent magnet motor - Google Patents
Motor stator for improving air gap magnetic field distribution and permanent magnet motor Download PDFInfo
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- CN218040940U CN218040940U CN202221731507.0U CN202221731507U CN218040940U CN 218040940 U CN218040940 U CN 218040940U CN 202221731507 U CN202221731507 U CN 202221731507U CN 218040940 U CN218040940 U CN 218040940U
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Abstract
The utility model discloses an improve air gap magnetic field distribution's motor stator and permanent-magnet machine, motor stator's a plurality of tooth portion equidistant set up in the inside wall of yoke portion, the pole shoe connect in the inboard of tooth portion, the tooth's socket sets up in adjacent 2 between the tooth portion, in the section that becomes alpha angle with the tooth central line OH of stator cross section, the pole shoe is provided with the pole shoe cut angle on the radial inboard perisporium of pole shoe, the pole shoe cut angle includes the circular arc section and is located the straightway of circular arc section both sides, and the nodical of straightway and circular arc section is pole cutting X, and the straightway coincides mutually with the section that the tooth central line of stator cross section becomes alpha angle, and 100 ≧ alpha is greater than or equal to 80, and the line of pole cutting X and the stator center O of one end is OX, and OX and the contained angle that OH formed is beta, and beta is: phi 2< beta < phi 1; the utility model provides an improve motor air gap magnetic field and distribute, reduce back electromotive force harmonic content, optimize motor stator and permanent-magnet machine of motor back electromotive force wave form.
Description
Technical Field
The utility model relates to a permanent-magnet machine technical field specifically is a motor stator and permanent-magnet machine who improves air gap magnetic field distribution.
Background
The permanent magnet synchronous motor brings excellent energy-saving effect in practical application due to the characteristics of high efficiency, wide high-efficiency speed regulation range and the like, so that the permanent magnet synchronous motor is increasingly applied to industry and agriculture. In the traditional motor stator design, the inner diameter and the outer diameter of the motor stator are designed by adopting a complete circular arc, and the circular arc section at the pole shoe position of the stator tooth part has no straight line chamfering characteristic, so that the processing precision control and the size inspection are facilitated. In the motor, the pole shoe is a unique structure of a magnetic pole formed by a stator tooth part of the motor, and is an expanded extension part of one end of a main magnetic pole iron core close to a rotor, and the pole shoe has the functions of reducing air gap magnetic resistance and improving the magnetic field distribution of the main magnetic pole.
The design that the inner diameter of the traditional motor stator adopts a complete circular arc is easy to generate a series of problems of non-sine of air gap flux density waveform, high back electromotive force harmonic distortion rate, poor sine degree of back electromotive force waveform, high tooth socket torque, reduction of motor efficiency and noise vibration caused by the problems, and the like. Although the harmonic distortion rate and the cogging torque of the motor can be reduced by adopting a stator skewed slot or a rotor skewed pole, the process is complex and the quality control is difficult, so that the production cost is high. The cogging torque is a phenomenon specific to the permanent magnet synchronous motor, and is a reluctance torque generated by interaction between an armature core (a motor stator with windings) and a rotor permanent magnet. When the motor is operated at a variable speed, resonance and strong noise may be generated if the cogging torque frequency is close to the system natural frequency, and the efficiency of the motor is reduced.
At present, with the development of motor design and manufacturing technology, the pole arc coefficient of the motor can be adjusted by chamfering the inner diameter arc section at the position of the pole shoe of the stator tooth part, namely the inner diameter arc section at the position of the pole shoe of the stator tooth part has the characteristic of straight line chamfering, so that the air gap magnetic field distribution of the motor is improved, the counter electromotive force harmonic content of the motor is reduced, the counter electromotive force waveform of the motor is optimized, and the cogging torque of the motor is reduced. However, if the straight chamfering characteristic line segment of the arc position of the pole shoe is not properly designed, the content of counter electromotive force harmonic waves can be increased, and the noise and vibration performance of the motor during operation can be deteriorated.
SUMMERY OF THE UTILITY MODEL
The utility model provides an improve motor air gap magnetic field and distribute, reduce back electromotive force harmonic content, optimize motor stator and permanent-magnet machine of motor back electromotive force wave form.
To achieve the purpose, the utility model provides the following technical scheme:
the utility model discloses an aspect provides an improve air gap magnetic field distribution's motor stator, including yoke portion, tooth portion, pole shoe and tooth's socket, it is a plurality of tooth equidistant set up in the inside wall of yoke portion, the pole shoe connect in the inboard of tooth portion, the tooth's socket sets up in adjacent 2 between the tooth portion, in the section that becomes alpha angle with stator cross section's tooth portion central line OH, the pole shoe is provided with the pole shoe cut angle on the radial inboard perisporium of pole shoe, the pole shoe cut angle includes the circular arc section and is located the straightway of circular arc section both sides, and the nodical of straightway and circular arc section is pole point X, and the straightway coincides mutually with the section that the tooth portion central line of stator cross section becomes alpha angle, and 100 degrees alpha is more than or equal to 80, and the line of pole point X of one end and stator center O is OX, and OX and the contained angle that OH formed is beta, and beta satisfies the following condition:
φ2<β<φ1；
φ1＝(γ-θ)/2；
φ2＝(γ-θ)/2-0.75°；
wherein, gamma is an included angle between central lines of two adjacent tooth parts, theta =180 °/(P × 2), and P is a pole pair number of the motor rotor.
Preferably, the width of the slot between the adjacent pole shoes is as follows:
δ＝k(πd/N)
wherein k is the slot gap coefficient, d is the inner diameter of the stator, N is the number of teeth of the stator, and k is more than or equal to 0.15 and is more than or equal to 0.12.
Preferably, the yoke is a circular ring; further preferably, the outer side wall of the yoke part is provided with a pi-shaped groove.
A second aspect of the utility model provides a permanent magnet motor, including motor stator and electric motor rotor, electric motor rotor sets up in the motor stator, its characterized in that, motor stator does motor stator.
Preferably, the utility model discloses a motor stator, including yoke portion, tooth portion, pole shoe and tooth's socket, it is a plurality of tooth portion equidistant set up in the inside wall of yoke portion, the pole shoe connect in the inboard of tooth portion, the tooth's socket sets up in adjacent 2 between the tooth portion, in the section that becomes alpha angle with the tooth central line OH of stator cross section, the pole shoe is provided with the pole shoe chamfer on the radial inboard perisporium of pole shoe, the pole shoe chamfer includes the circular arc section and is located the straightway of circular arc section both sides, and the nodical point of straightway and circular arc section is pole chamfering X, and the straightway coincides with the section that the tooth central line of stator cross section becomes alpha angle, and 100 ≧ alpha ≧ 80, the line of pole chamfering X of one end and stator center O is OX, and OX and the contained angle that OH formed is beta, and beta satisfies the following condition:
φ2<β<φ1；
φ1＝(γ-θ)/2；
φ2＝(γ-θ)/2-0.75°；
wherein γ is an angle between center lines of two adjacent teeth, θ =180 °/(P × 2), and P is a pole pair number of the motor rotor.
Preferably, the width of the slot between the adjacent pole shoes is as follows:
δ＝k(πd/N)
wherein k is the slot gap coefficient, d is the inner diameter of the stator, N is the number of teeth of the stator, and k is more than or equal to 0.15 and is more than or equal to 0.12.
Preferably, the yoke is a circular ring; further preferably, the outer side wall of the yoke portion is provided with a pi-shaped groove.
Compared with the prior art, the utility model discloses beneficial effect and showing the progress and lie in:
1. the utility model provides a motor stator and permanent-magnet machine improves motor air gap magnetic field and distributes, reduces back electromotive force harmonic content, optimizes motor back electromotive force waveform, and the effect that reduces motor tooth's socket torque all is superior to prior art.
2. The utility model provides a motor stator and permanent-magnet machine, simple process is and the quality management and control is easy, is applicable to big manufacturing in batches.
Drawings
To more clearly illustrate the technical solution of the present invention, the attached drawings required for implementing the embodiments of the present invention will be briefly described below.
It should be apparent that the drawings in the following description are only for some embodiments of the present invention, and that other drawings can be obtained by those skilled in the art without any inventive exercise, and the other drawings also belong to the drawings required for the embodiments of the present invention.
Fig. 1 is a schematic structural diagram of a stator of an electric machine for improving the distribution of an air-gap magnetic field in embodiment 1;
fig. 2 is a schematic perspective view of a stator of an electric motor for improving the distribution of the air-gap magnetic field in embodiment 1;
FIG. 3 is a motor efficiency chart before and after optimization in example 5
FIG. 4 is a waveform diagram of back electromotive force before optimization in example 5;
FIG. 5 is a waveform diagram of the optimized back EMF of example 5;
reference numerals, 1, yoke part, 2, tooth part, 3, pole shoe, 4, tooth groove, 5, arc segment, 6 and straight segment.
Detailed Description
In order to make the objects, technical solutions, advantageous effects and significant progress of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be described clearly and completely below.
It is to be understood that all of the described embodiments are only some, and not all, of the embodiments of the invention; based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without making creative efforts belong to the protection scope of the present invention.
It should be noted that the terms "first", "second" and "third" (if present) and the like in the description and the claims of the present invention are used for distinguishing different objects and are not used for describing a specific order. Furthermore, the terms "comprises" and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
It is to be understood that:
in the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "fixed," and the like are to be understood in a broad sense, and may be, for example, fixedly connected, detachably connected, or movably connected, or integrated; they may be direct connections, indirect connections through an intermediary, intangible signal connections, or even optical connections, and may be internal connections of two elements or an interaction between two elements, unless expressly specified otherwise.
The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
It should be further noted that the following embodiments may be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.
The technical solution of the present invention will be described in detail with reference to specific examples.
Example 1
As shown in fig. 1 and 2, a motor stator for improving distribution of an air-gap magnetic field is shown, which includes a yoke 1, teeth 2, pole shoes 3 and tooth sockets 4, wherein a plurality of teeth 2 are arranged on an inner side wall of the yoke 1 at equal intervals, the pole shoes 3 are connected to inner sides of the teeth 2, the tooth sockets 4 are arranged between adjacent 2 teeth 2, the pole shoes 3 are provided with pole shoe chamfering angles in a section forming an angle α with a tooth center line OH of a cross section of the stator, on a radial inner side peripheral wall of the pole shoes, the pole shoe chamfering angles include arc segments 5 and straight segments 6 located at two sides of the arc segments, intersection points of the straight segments 6 and the arc segments 5 are pole chamfering points X, the straight segments 6 coincide with the section forming the angle α with the tooth center line of the cross section of the stator cross section, 100 degrees or more than or equal to alpha 80 degrees, a connecting line of the pole chamfering point X at one end and the stator center O is OX, an included angle formed by the OX and the OH is β, and the following conditions are satisfied:
φ2<β<φ1；
φ1＝(γ-θ)/2；
φ2＝(γ-θ)/2-0.75°；
where γ is an angle between center lines of two adjacent teeth 2, θ =180 °/(P × 2), and P is a number of pole pairs of the motor rotor.
In this embodiment, the width of the slot between adjacent pole shoes is:
δ＝k(πd/N)
wherein k is the slot gap coefficient, d is the inner diameter of the stator, N is the number of teeth of the stator, and k is more than or equal to 0.15 and is more than or equal to 0.12.
In the present embodiment, the yoke is a circular ring; the outer side wall of the yoke portion is provided with a Pi-shaped groove.
Example 2
A motor stator for improving distribution of an air-gap magnetic field comprises a yoke, tooth parts, pole shoes and tooth grooves, wherein a plurality of tooth parts are arranged on the inner side wall of the yoke at equal intervals, the pole shoes are connected to the inner sides of the tooth parts, the tooth grooves are arranged between every two adjacent tooth parts, in a section which forms an alpha angle with a tooth part central line OH of the cross section of a stator, each pole shoe is provided with a pole shoe chamfering angle, on the radial inner side peripheral wall of each pole shoe, each pole shoe chamfering angle comprises an arc section and straight sections located on two sides of the arc section, the intersection point of each straight section and the arc section is a chamfering pole X, the sections of the straight sections and the tooth part central line of the cross section of the stator, which form the alpha angle are overlapped, alpha =86.9 degrees, the connecting line of the chamfering pole X at one end and the center O of the stator is OX, the included angle formed by the OX and the OH is beta, and the following conditions are met:
φ2<β<φ1；
φ1＝(γ-θ)/2＝8.57°；
φ2＝(γ-θ)/2-0.75°＝7.82°；
where γ =30 ° is an angle between center lines of two adjacent teeth, θ =180 °/(P × 2) =12.85 ° (where P = 7), and P is a number of pole pairs of the motor rotor.
In this embodiment, the width of the slot between adjacent pole shoes is:
δ＝k(πd/N)＝3.175mm
where k =0.13 is the slot gap coefficient, d =92.71 is the stator inner diameter, and N =12 is the stator tooth number.
In the present embodiment, the yoke is a circular ring; the outer side wall of the yoke part is provided with a Pi-shaped groove.
Example 3
A motor stator for improving distribution of an air-gap magnetic field comprises a yoke, tooth parts, pole shoes and tooth grooves, wherein a plurality of tooth parts are arranged on the inner side wall of the yoke at equal intervals, the pole shoes are connected to the inner sides of the tooth parts, the tooth grooves are arranged between every two adjacent tooth parts, in a section which forms an alpha angle with a tooth part central line OH of the cross section of a stator, the pole shoes are provided with pole shoe chamfering angles, on the radial inner side peripheral wall of the pole shoes, each pole shoe chamfering angle comprises an arc section and straight sections positioned on two sides of the arc section, the intersection point of the straight sections and the arc section is a chamfering pole point X, the section, forming the alpha angle, between the straight sections and the tooth part central line of the cross section of the stator, is alpha =86.9 degrees, the connecting line of the chamfering pole point X at one end and the center O of the stator is OX, the included angle formed by the OX and the OH is beta, and the following conditions are met:
φ2<β<φ1；
φ1＝(γ-θ)/2＝9°；
φ2＝(γ-θ)/2-0.75°＝8.25°；
where γ =40 ° is an angle between center lines of two adjacent teeth, θ =180 °/(P × 2) =18 ° (where P = 5), and P is a number of pole pairs of the motor rotor.
In this embodiment, the width of the slot between adjacent pole shoes is:
δ＝k(πd/N)＝4.2mm
where k =0.13 is the slot gap coefficient, d =92.71 is the stator inner diameter, and N =9 is the stator tooth number.
In the present embodiment, the yoke is a circular ring; the outer side wall of the yoke portion is provided with a Pi-shaped groove.
Example 4
A motor stator for improving distribution of an air-gap magnetic field comprises a yoke, tooth parts, pole shoes and tooth grooves, wherein a plurality of tooth parts are arranged on the inner side wall of the yoke at equal intervals, the pole shoes are connected to the inner sides of the tooth parts, the tooth grooves are arranged between every two adjacent tooth parts, in a section which forms an alpha angle with a tooth part central line OH of the cross section of a stator, each pole shoe is provided with a pole shoe chamfering angle, on the radial inner side peripheral wall of each pole shoe, each pole shoe chamfering angle comprises an arc section and straight sections located on two sides of the arc section, the intersection point of each straight section and the arc section is a chamfering pole X, the sections of the straight sections and the tooth part central line of the cross section of the stator, which form the alpha angle are overlapped, alpha =86.9 degrees, the connecting line of the chamfering pole X at one end and the center O of the stator is OX, the included angle formed by the OX and the OH is beta, and the following conditions are met:
φ2<β<φ1；
φ1＝(γ-θ)/2＝3.57°；
φ2＝(γ-θ)/2-0.75°＝2.82°；
where γ =20 ° is an angle between center lines of two adjacent teeth, θ =180 °/(P × 2) =12.85 ° (where P = 7), and P is a number of pole pairs of the motor rotor.
In the present embodiment, the width of the slot between adjacent pole shoes is:
δ＝k(πd/N)＝2.1mm
wherein k =0.13 is a slot gap coefficient, d =92.71 is a stator inner diameter, and N =18 is a stator tooth number.
In the present embodiment, the yoke is a circular ring; the outer side wall of the yoke part is provided with a Pi-shaped groove.
Example 5
With a commercially available motor stator and an optimized electronic stator of the invention by optimizing the pole shoe profile configuration (preferably an angle α of 86.9 °, β = Φ -0.5 °), the following tests were performed:
1. efficiency of the electric machine
The motor stator before optimization (commercially available motor stator) and the optimized electronic stator (motor stator with improved air gap field distribution of the present application) were operated, and the efficiency of the motor in 2 was examined.
The results are shown in fig. 3, where the optimized stator efficiency is significantly higher than the stator before optimization.
2. Back emf waveform
The motor stator before optimization (commercially available motor stator) and the optimized electronic stator (motor stator with improved air gap magnetic field distribution in the present application) are operated, and the back electromotive force waveform of the motor in 2 is detected. The back electromotive force is an electromotive force having a tendency to oppose the passage of current, and is essentially an induced electromotive force. Back emf typically occurs in electromagnetic coils such as relay coils, solenoid valves, contactor coils, motors, inductors, and the like. In general, as long as there is an electrical device for converting electric energy and magnetic energy, there is a back electromotive force at the moment of power failure, and the back electromotive force has many hazards and is not well controlled, which may damage electrical components.
As a result, as shown in fig. 4 and 5, the frequency of the back electromotive force waveform before optimization was 81.69Hz, and the frequency of the back electromotive force waveform after optimization was 49.83Hz.
In conclusion, unequal air gaps can be established through chamfering the two ends of the stator teeth, the air gap flux density waveform is optimized, the air gap flux density waveform distortion rate is reduced, the back electromotive force sine degree is improved, the torque pulsation and the stator iron loss are reduced, the efficiency is improved, and meanwhile the noise is also reduced.
During the description of the above description:
the description of the terms "present embodiment," embodiments of the invention, "" such as "\ 8230; \ 8230"; "shown," "further improved technical sub-arrangements," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention; in this specification, the schematic representations of the terms used above are not necessarily for the same embodiment or example, and the particular features, structures, materials, or characteristics described, etc., may be combined or brought together in any suitable manner in any one or more embodiments or examples; furthermore, those of ordinary skill in the art may combine or combine features of different embodiments or examples and features of different embodiments or examples described in this specification without undue conflict.
Finally, it should be noted that:
the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same;
although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions described in the foregoing embodiments may be modified or equivalent replaced by some or all of the technical features, and such modifications or replacements may not cause the essence of the corresponding technical solutions to depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (5)
1. The motor stator is characterized by comprising a yoke part, tooth parts, pole shoes and tooth grooves, wherein the tooth parts are arranged on the inner side wall of the yoke part at equal intervals, the pole shoes are connected to the inner sides of the tooth parts, the tooth grooves are arranged between every two adjacent tooth parts, a pole shoe chamfering angle is arranged on each pole shoe in a section forming an alpha angle with a tooth part central line OH of the cross section of the stator, the radial inner side peripheral wall of each pole shoe comprises an arc section and straight sections positioned on two sides of the arc section, the intersection point of each straight section and the arc section is a pole chamfering X, the straight sections coincide with the section forming the alpha angle with the tooth part central line of the cross section of the stator, alpha is more than or equal to 80 degrees at an angle of 100 degrees, the connecting line of the pole chamfering X at one end and the stator center O is OX, the included angle formed by the OX and the OH is beta, and the beta meets the following conditions:
φ2<β<φ1；
φ1＝(γ-θ)/2；
φ2＝(γ-θ)/2-0.75°；
wherein γ is an angle between center lines of two adjacent teeth, θ =180 °/(P × 2), and P is a pole pair number of the motor rotor.
2. The stator of claim 1, wherein the slot widths between adjacent pole pieces are:
δ＝k(πd/N)
wherein k is the slot gap coefficient, d is the inner diameter of the stator, N is the number of teeth of the stator, and k is more than or equal to 0.15 and is more than or equal to 0.12.
3. The motor stator for improving the distribution of the air-gap magnetic field according to claim 1, wherein the yoke portion is a circular ring.
4. The stator for an electric motor with improved air-gap field distribution as claimed in claim 1, wherein the outer side wall of said yoke portion is provided with pi-shaped slots.
5. A permanent magnet motor comprising a motor stator and a motor rotor, said motor rotor being arranged within said motor stator, characterized in that said motor stator is according to any of claims 1-4.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116742845A (en) * | 2023-05-16 | 2023-09-12 | 石河子大学 | Stator and rotor structure for reducing vibration and noise and switched reluctance motor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116742845A (en) * | 2023-05-16 | 2023-09-12 | 石河子大学 | Stator and rotor structure for reducing vibration and noise and switched reluctance motor |
| CN116742845B (en) * | 2023-05-16 | 2024-03-15 | 石河子大学 | Stator and rotor structure for reducing vibration and noise and switched reluctance motor |
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