CN213754117U - Iron core punching sheet, stator iron core, motor and new energy automobile - Google Patents

Abstract

The application relates to permanent magnet motor technical field, provides an iron core towards piece, stator core, motor and new energy automobile, and this iron core towards piece includes: a plurality of weld grooves located at the periphery, the weld grooves comprising: the transition section is positioned at the connecting part of the two side edges of the welding groove and the periphery of the iron core stamped sheet, and the transition section is a fillet; the welding section is positioned at the bottom of the welding groove and protrudes outwards; and the connecting sections are positioned at the bottom of the welding groove, the two connecting sections are respectively positioned at two sides of the welding section, and a gap is formed between the side edge of the welding groove and the welding section. When the magnetic flux shield is used, the welding groove with the welding section can effectively block the circulation of magnetic force lines at the welding groove when the magnetic flux density is unsaturated, and the eddy current loss is reduced; when the magnetic density is saturated, the concentration and sudden change of electromagnetic exciting force can be reduced, and therefore the noise of the motor is reduced.

Description

Iron core punching sheet, stator iron core, motor and new energy automobile

Technical Field

The application relates to the field of permanent magnet motor equipment, in particular to an iron core punching sheet, a stator iron core, a motor and a new energy automobile.

Background

Automobile permanent magnet synchronous machine, its power density is high and small, and serious electromagnetic saturation can appear in motor stator yoke portion under the heavy current usually for electromagnetic excitation power grow, the increase of generating heat, efficiency reduces.

In order to reduce the eddy current loss of the motor stator, referring to fig. 1, in the prior art, after the thinner stator sheets 1 are stacked to a certain thickness, the welding slots 11 are welded to form an integral structure of the multilayer stator sheets 1, the welding slots 11 form a continuous structure, a current conduction path is easily formed under the action of induced magnetic flux, and the eddy current loss is increased; because the yoke part of the stator is saturated in magnetic density, magnetic lines of force of the yoke part of the stator are arranged along the edge of the stator, and the shape of the welding groove 11 obviously affects the magnetic lines of force, so that the electromagnetic exciting force changes, and the noise of the motor is affected.

SUMMERY OF THE UTILITY MODEL

The utility model provides a main aim at overcomes above-mentioned prior art's stator welding part increases the eddy current loss and influences the problem of motor noise, provides one kind and can effectively reduce the iron core towards piece of motor electromagnetic noise and stator weld groove department eddy current loss.

Another main objective of the present application is to overcome the above problems of the prior art that the stator welding portion increases eddy current loss and affects motor noise, and to provide a stator core capable of effectively reducing motor electromagnetic noise and eddy current loss at the stator welding slot.

Another main object of the present application is to overcome the above-mentioned problems of the prior art that the eddy current loss is increased in the welded portion of the stator and the noise of the motor is affected, and to provide a motor capable of effectively reducing the electromagnetic noise of the motor and the eddy current loss at the welded slot of the stator.

Another main objective of the present application is to overcome the above problems of the prior art that the eddy current loss is increased in the stator welding portion and the motor noise is affected, and to provide a new energy automobile capable of effectively reducing the electromagnetic noise of the motor and the eddy current loss at the stator welding slot.

According to an aspect of the application, a core punching sheet is provided, including a plurality of weld grooves that are located the periphery, the weld groove includes: the transition section is positioned at the connecting part of the two side edges of the welding groove and the periphery of the iron core stamped sheet, and the transition section is a fillet; the welding section is positioned at the bottom of the welding groove and protrudes outwards; and the connecting sections are positioned at the bottom of the welding groove, the two connecting sections are respectively positioned at two sides of the welding section, and a gap is formed between the side edge of the welding groove and the welding section.

Optionally, in a flux density saturation state, the minimum curvature radius of the magnetic force line in the iron core sheet is R₁(ii) a Under the unsaturated state of magnetic density, the maximum curvature radius of the magnetic force line in the iron core punching sheet is R₂Wherein R is₁>R₂；

The radius of the transition section is R₃Wherein R is₁>R₃≥R₂；

The width of the connecting section is D, wherein R₁>D≥R₂。

Optionally, the radius of the transition section is the same as the minimum width of the connecting section.

Optionally, the radius of the transition section is within 1.2-1.5 mm.

Optionally, the outer contour structure of the welding section is an arc, and the radius of the arc is twice the radius of the transition section.

Optionally, the radius of the welding section is within 2.5-3.2 mm.

Optionally, the connecting section comprises a first connecting section and a second connecting section; the first connecting section is connected with the transition section, the second connecting section is connected with the welding section, and an obtuse included angle is formed between the first connecting section and the second connecting section; the length of the second connecting section is the minimum width of the connecting section.

Optionally, the length of the first connecting section is twice that of the second connecting section.

Optionally, the length of the first connecting section is within 1.8-2.2mm, and the length of the second connecting section is within 1.0-1.3 mm.

Optionally, an acute included angle is formed between the first connecting sections located at two sides of the welding section.

Optionally, welding in the welding groove to form a welding surface; the welding surface is provided with a plurality of welding points, and the welding points are welded and formed on the welding section.

Optionally, the periphery of the welding section is located inside the periphery of the iron core stamped steel.

According to another aspect of the application, a stator core is provided, which is formed by stacking a plurality of iron core punching sheets, and the iron core punching sheets are connected with the welding grooves in a welding mode.

According to another aspect of the present application, there is provided an electric machine comprising a stator including the stator core described above.

According to another aspect of the application, a new energy automobile is provided, which comprises the motor, wherein the motor is a power motor.

According to the technical scheme, the iron core punching sheet, the stator iron core, the motor and the new energy automobile have the advantages and positive effects that:

according to the iron core punching sheet provided by the application, when the flux density at the welding groove is unsaturated, the magnetic force lines passing through the iron core punching sheet cannot cross the connecting section at the bottom of the welding groove, and all the magnetic force lines pass through the solid part of the iron core punching sheet, so that the circulation of the magnetic force lines at the welding groove can be effectively blocked, the welding groove cannot form a continuous structure, a current conduction path cannot be formed under the action of induced magnetic flux, at the moment, eddy current loss hardly exists at the welding groove, and the heating of a motor is effectively reduced; when the flux density saturation at the weld groove is too high, the flux lines at the weld groove pass through the transition section and are highly concentrated at the transition section, so that part of the flux lines start to cross the connection section along the bottom of the connection section and pass through the welding section, the effect is equal to the increase of the equivalent distance of the iron core stamped sheet at the weld groove, the flux density saturation at the weld groove is relieved, the flux density saturation at the weld groove is radially uniform on the circumference, the concentration and mutation of electromagnetic excitation force are reduced, and the motor noise is reduced.

The application provides a pair of stator core, including aforementioned iron core towards the piece, its beneficial effect is unanimous with aforementioned iron core towards the piece, and in addition, stator core piles up certain thickness by the iron core towards the piece after, through the synthetic integrative structure of weld groove department welding, for the riveting fixed, welding process is comparatively convenient and can strengthen structural strength better.

The application provides a motor, including the stator, the stator has aforementioned stator core, and its beneficial effect is unanimous with aforementioned stator core, just no longer gives unnecessary details here.

The application provides a new energy automobile, including aforementioned motor, its beneficial effect is unanimous with aforementioned motor, just does not describe here again.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.

FIG. 1 is a schematic view of a stator segment of the prior art;

fig. 2 is a schematic structural diagram of a core plate according to an exemplary embodiment;

fig. 3 is an enlarged view of a core plate at a, according to an exemplary embodiment;

FIG. 4 is a prior art magnetic field line profile at the weld groove when the magnetic density is too high;

fig. 5 is a magnetic force line distribution diagram illustrating an iron core lamination with an excessively high magnetic density according to an exemplary embodiment;

FIG. 6 is a prior art magnetic density distribution plot at the weld groove when the magnetic density is too high;

FIG. 7 is a graph illustrating magnetic density distribution for an iron core lamination with excessive magnetic density, according to an exemplary embodiment;

FIG. 8 is a graph of the variation of the electromagnetic force at the weld gap in the prior art;

fig. 9 is a graph illustrating an electromagnetic force variation amplitude of a core segment according to an exemplary embodiment.

Wherein the reference numerals are as follows:

1. stator scattered sheets; 11. welding a groove;

2. punching an iron core; 21. stator teeth; 22. a stator yoke; 23. stator welding slots; 231-a transition section; 232. welding a section; 233. a connecting section; 2331. a first connection section; 2332. a second connection section.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Referring to fig. 2-9, fig. 2 is a schematic structural diagram of a core segment according to an exemplary embodiment; fig. 3 is an enlarged view of a core plate at a, according to an exemplary embodiment; FIG. 4 is a prior art magnetic field line profile at the weld groove when the magnetic density is too high; fig. 5 is a magnetic force line distribution diagram illustrating an iron core lamination with an excessively high magnetic density according to an exemplary embodiment; FIG. 6 is a prior art magnetic density distribution plot at the weld groove when the magnetic density is too high; FIG. 7 is a graph illustrating magnetic density distribution for an iron core lamination with excessive magnetic density, according to an exemplary embodiment; FIG. 8 is a graph of the variation of the electromagnetic force at the weld gap in the prior art; fig. 9 is a graph illustrating an electromagnetic force variation amplitude of a core segment according to an exemplary embodiment.

The vehicle motor is generally high in power and small in size, a yoke part of a stator of the motor is easy to generate serious electromagnetic saturation, and due to the fact that the size difference between the position of a welding groove and the position of a non-welding groove is large, magnetic density is suddenly changed, electromagnetic exciting force is increased, and motor noise is increased; meanwhile, magnetic lines of force pass through the welding grooves, so that the eddy current loss of the stator is increased, and the efficiency is reduced. Currently, in order to reduce the electromagnetic exciting force and the eddy current loss of the stator, the welding groove is generally set to be thin, which easily causes the welding strength of the stator to be insufficient, and the problems of noise and efficiency cannot be fundamentally solved.

In order to solve the technical problem, the application provides an iron core punching sheet 2. Referring to fig. 2-3, a core segment 2 capable of embodying the principles of the present application is representatively illustrated in fig. 2-3, and includes a plurality of peripherally located weld recesses 23, the weld recesses 23 including: the transition section 231 is positioned at the connecting part of the two side edges of the welding groove 23 and the periphery of the iron core stamped sheet, and the transition section 231 is a rounded corner; the welding section 232 is positioned at the bottom of the welding groove 23, and the welding section 232 protrudes outwards; and the connecting sections 233 located at the bottom of the welding groove 23, the two connecting sections 233 being located at both sides of the welding section 232, respectively, a gap being formed between the side of the welding groove 23 and the welding section 232.

According to the weld groove 23 provided by the application, when the flux density at the weld groove is unsaturated, a gap is formed between the side edge of the weld groove 23 and the welding section 232, so that a magnetic line of force passing through the iron core stamped steel 2 cannot cross the inward-recessed connecting section 233, and the magnetic line of force completely passes through the solid part of the iron core stamped steel 2, so that the circulation of the magnetic line of force at the weld groove 23 can be effectively blocked, the weld groove 23 cannot form a continuous structure, a current conduction path cannot be formed under the action of induced magnetic flux, at the moment, eddy current loss hardly exists at the weld groove 23, and the heating of a motor is effectively reduced; when the flux density saturation at the weld groove is too high, referring to fig. 4-7, the magnetic flux at the weld groove 23 passes through the transition section 231 and is highly concentrated at this position, so that part of the magnetic flux starts to pass through the connection section 233 along the minimum slot width of the connection section 233 and passes through the weld section 232, which is equivalent to that the equivalent distance of the iron core at the weld groove 23 is increased, so that the flux density saturation at the weld groove is relieved, and the magnetic flux density saturation at the weld groove tends to be uniform in the circumferential radial direction, and the concentration and the sudden change of the electromagnetic excitation force are reduced, so that the motor noise is reduced.

Referring to fig. 2, fig. 2 representatively illustrates a core segment 2 capable of embodying the principles of the present application, which includes weld grooves 23, stator teeth 21, and a stator yoke 22 circumferentially surrounding the stator teeth 21; the weld groove 23 is formed on the stator yoke 22, and the transition section 231 is connected to the stator yoke 22. The main body part of the iron core punching sheet 2 is composed of a silicon steel sheet with stator slots formed by punching or cutting and a plurality of welding slots 23 arranged on the excircle of the silicon steel sheet, wherein the silicon steel sheet is provided with stator teeth 21 and a stator yoke 22, and the welding slots 23 are uniformly distributed on the stator yoke 22, so that the stress on the periphery of the stator is uniform after welding.

In an alternative of this embodiment, in a saturated state, the minimum curvature radius of the magnetic line of force in the iron core stamped sheet 2 is R1, and in an unsaturated state, the maximum curvature radius of the magnetic line of force in the iron core stamped sheet 2 is R2, and since the magnetic line of force in the saturated state approaches a straight line, and the magnetic line of force in the unsaturated state is a curve with a large curvature, R1> R2.

According to the following steps: under the saturation state, the magnetic line of force can stride across this clearance and reduce eddy current loss, under the unsaturated state, the magnetic line of force can not cross this clearance, can only pass from iron core towards piece 2 entity part, can deduce: the radius of the transition section 231 is R3, wherein R1> R3 ≧ R2, and the width of the connecting section 233 is D, wherein R1> D ≧ R2.

In an alternative to this embodiment, referring to fig. 3, the connecting segment 233 includes a first connecting segment 2331 and a second connecting segment 2332; the first connecting section 2331 is connected to the transition section 231, the second connecting section 2332 is connected to the central circle, and the first connecting section 2331 and the second connecting section 2332 form an obtuse included angle, and the first connecting section 2331 and the second connecting section 2332 are both straight lines.

It should be understood that the angle between the first connecting section 2331 and the second connecting section 2332 is 100-.

Specifically, with continued reference to fig. 3, the transition section 231 is tangent to the outer circle of the stator and the first connecting section 2331, and the two ends of the welding section 232 are tangent to the second connecting section 2332. The first connecting section 2331 transitions in a circular arc with the second connecting section 2332. The arc is a technical arc, which ensures the integrity of the appearance of the weld groove 23 while ensuring the assembly of the first connecting section 2331 and the second connecting section 2332.

In an alternative of this embodiment, the first connecting segments 2331 on both sides of the welding segment 232 are symmetrically distributed along the center line of the stator teeth 21. The two first connecting sections 2331 are symmetrically arranged, so that the stator welds are symmetrically distributed along two sides of the same stator tooth 21, and the stress conditions of all parts after welding are consistent. The first connecting sections 2331 on both sides of the welding section 232 form an acute included angle of 35-40 °, preferably 35 °. If this contained angle is less than 35, weld groove 23 accounts for the volume undersize of iron core towards piece 2, is difficult to guarantee welding strength, and can be in order to alleviate magnetic density, if this contained angle is greater than 40, weld groove 23 accounts for the volume oversize of iron core towards piece 2 for entity's volume undersize influences the overall structure intensity of iron core towards piece 2. Therefore, the angle of the first connecting section 2331 on both sides of the same welding section 232 is optimal at 35 °.

In an alternative of the present embodiment, a weld face having a plurality of weld points is formed in the weld groove 23 of the present application, and the weld points are formed on the weld segments 232. The welding section 232 is a central circle; the center of the central circle is located on the center line of the stator teeth 21, and the circumference of the central circle is located in the periphery of the iron core punching sheet 2. Since the center of the center circle is located on the center line of the stator teeth 21, it can be seen that the center circle is arranged corresponding to the stator teeth 21, and the stator entity parts are ensured to be uniformly distributed along the radial direction. The circumference of the central circle is in the periphery of the iron core punching sheet 2, and the welded protruding part is also in the periphery of the iron core punching sheet 2, so that the roundness of the iron core punching sheet 2 is not influenced.

In an alternative embodiment, the length of the second connecting section 2332 is the minimum width of the connecting section 233, which is the same or similar to the radius of the transition section 231. The radius of the center circle is twice the radius of the transition 231. The first connecting section 2331 is twice as long as the second connecting section 2332. Specifically, the radius of the transition section 231 is 1.2-1.5mm, and the length of the second connecting section 2332 is 1-1.3 mm. The length of the second connecting section 2332 is similar to the radius of the transition section 231 to ensure that when the magnetic density is high, the magnetic lines of force cross the connecting section 233 and when the magnetic density is low, the magnetic lines of force pass through the solid portion of the stator. The length of the first connecting section 2331 is 1.8-2.2mm, the length of the first connecting section 2331 is less than 1.8mm, the depth of the connecting section 233 cannot be guaranteed, the welding strength is poor, the stator core is easy to scatter, the length of the connecting section 233 is greater than 2.2mm, the position of the welding groove 23 is close to the stator tooth 21, and interference is easy to cause, so that the length of the first connecting section 2331 is 1.8-2.2mm, and the welding effect is guaranteed without affecting the stator tooth 21. The radius of the center circle is between 2.5 and 3.2mm, if the radius of the center circle is less than 2.5mm, the magnetic density is large, the stator solid part cannot pass through enough magnetic lines of force, and the welding strength is difficult to satisfy during welding, if the radius of the center circle is more than 3.2mm, the gap can pass through only a few magnetic lines of force, and thus the magnetic density cannot be relieved, and therefore, the radius of the center circle is optimal at 2.5 to 3.2 mm.

It should be understood that the connection angles of the welding section 232, the connection section 233 and the transition section 231 are all illustrated, and other parameters may be selected under different process conditions, which is not described herein.

In an alternative of this embodiment, the number of weld grooves 23 is the quotient of the number of stator grooves and the number of pole pairs of the motor. The number of the stator slots is linearly related to the number of pole pairs of the motor, the number of the stator slots is larger, the number of the pole pairs of the motor is related to the rotating speed and the stability of the motor, and the number of the pole pairs is larger, so that the rotating speed is small and the operation is more stable.

The application also provides a stator core, which is formed by stacking a plurality of iron core punching sheets 2, and the welding grooves 23 on the plurality of iron core punching sheets 2 are welded and connected. The application provides a pair of stator core, its beneficial effect is unanimous with above-mentioned iron core towards piece 2, and in addition, stator core piles up certain thickness by iron core towards piece 2 after, through the synthetic integrative structure of weld groove 23 department, for the riveting fixed, welding process is comparatively convenient and can strengthen structural strength better.

Referring to fig. 8-9, the present application differs from the prior art in that eddy current loss is always present at the weld slot, and the core segment 2 of the present application can make the motor have almost no eddy current loss at the weld slot before the saturation point of the stator. Simultaneously, this application can effectively reduce the welding groove department magnetic density sudden change that the stator saturation arouses to it is concentrated to reduce electromagnetic excitation force. Referring to fig. 5, by using the weld groove 23 of the present application, the electromagnetic force amplitude of 36 orders in this embodiment of the peak order of the motor can be effectively reduced by about 10%, which has a significant effect on reducing the noise of the motor.

The application further provides a motor, which comprises a stator, wherein the stator comprises the stator core. The motor has the same effect as the stator core, and the description is omitted here.

The application also provides a new energy automobile, the motor that includes, this motor is power motor. The new energy automobile has the same effect as the motor, and is not repeated herein.

It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above description is only exemplary of the invention, and is intended to enable those skilled in the art to understand and implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (15)

1. The utility model provides an iron core towards piece (2), includes a plurality of weld groove (23) that are located the periphery, its characterized in that, weld groove (23) include:

the transition section (231) is positioned at the connecting part of the two side edges of the welding groove (23) and the periphery of the iron core stamped steel, and the transition section (231) is a rounded corner;

the welding section (232) is positioned at the bottom of the welding groove (23), and the welding section (232) protrudes outwards; and the number of the first and second groups,

the connecting sections (233) are located at the bottoms of the welding grooves (23), the two connecting sections (233) are located on two sides of the welding sections (232) respectively, and gaps are formed between the side edges of the welding grooves (23) and the welding sections (232).

2. The iron core punching sheet (2) according to claim 1, characterized in that, in a flux density saturation state, the minimum curvature radius of magnetic lines of force in the iron core punching sheet (2) is R₁(ii) a Under the unsaturated state of magnetic density, the maximum curvature radius of the magnetic force line in the iron core punching sheet (2) is R₂Wherein R is₁>R₂；

The radius of the transition section (231) is R₃Wherein，R₁>R₃≥R₂；

The connecting section (233) has a width D, wherein R₁>D≥R₂。

3. A core segment (2) as claimed in claim 1 or 2, characterized in that the radius of the transition section (231) is the same as the minimum width of the connecting section (233).

4. A core punching (2) according to claim 3, characterized in that the radius of the transition section (231) is within 1.2-1.5 mm.

5. The iron core punching sheet (2) according to claim 1 or 2, characterized in that the outer contour structure of the welding section (232) is an arc, and the radius of the arc is twice as large as the radius of the transition section (231).

6. The iron core punching sheet (2) according to claim 5, characterized in that the radius of the welding section (232) is within 2.5-3.2 mm.

7. The iron core punching sheet (2) according to claim 1, wherein the connecting section (233) comprises a first connecting section (2331) and a second connecting section (2332); the first connecting section (2331) is connected with the transition section (231), the second connecting section (2332) is connected with the welding section (232), and an obtuse included angle is formed between the first connecting section (2331) and the second connecting section (2332); the length of the second connecting segment (2332) is the smallest width of the connecting segment.

8. The iron core punching sheet (2) as claimed in claim 7, wherein the length of the first connecting section (2331) is twice as long as the length of the second connecting section (2332).

9. The iron core punching sheet (2) as claimed in claim 8, wherein the length of the first connecting section (2331) is within 1.8-2.2mm, and the length of the second connecting section (2332) is within 1.0-1.3 mm.

10. The iron core punching sheet (2) according to claim 7, wherein the first connecting sections (2331) at both sides of the welding section (232) form an acute angle therebetween.

11. The iron core punching sheet (2) according to claim 1, characterized in that the welding groove (23) is welded to form a welding surface; the welding face has a plurality of welding points which are welded and formed on the welding section (232).

12. The core segment (2) as claimed in claim 11, wherein the periphery of the welding section (232) is located within the periphery of the core segment (2).

13. A stator core, characterized in that, it comprises a plurality of iron core punching sheets (2) as claimed in any one of claims 1-12, a plurality of said iron core punching sheets (2) are stacked to form said stator core, and said weld grooves (23) on a plurality of said iron core punching sheets (2) are welded together.

14. An electrical machine comprising a stator core as claimed in claim 13.

15. A new energy automobile, characterized by comprising the motor according to claim 14, wherein the motor is a power motor.

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