CN111864939A - Rotor punching sheet, oblique-pole rotor, production method of oblique-pole rotor, motor and electric automobile - Google Patents

Rotor punching sheet, oblique-pole rotor, production method of oblique-pole rotor, motor and electric automobile Download PDF

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Publication number
CN111864939A
CN111864939A CN202010711374.XA CN202010711374A CN111864939A CN 111864939 A CN111864939 A CN 111864939A CN 202010711374 A CN202010711374 A CN 202010711374A CN 111864939 A CN111864939 A CN 111864939A
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China
Prior art keywords
rotor
sheet
punching
punching sheet
oblique
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Chinese (zh)
Inventor
姜月明
贾金信
郭长光
汪汉新
张琦
肖意南
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Priority to CN202010711374.XA priority Critical patent/CN111864939A/en
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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
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • 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
    • H02K1/32—Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacture Of Motors, Generators (AREA)

Abstract

The invention provides a rotor punching sheet, an oblique-pole rotor, a production method of the oblique-pole rotor, a motor and an electric automobile, wherein the rotor punching sheet comprises: the magnetic poles are uniformly arranged along the circumferential direction, and the number of the magnetic poles is X; the positioning holes are uniformly arranged along the circumferential direction, and the number of the positioning holes is Y; satisfy, Y ═ aX-1, where X > 2, a ═ 1,2,3 … … n. The rotor punching sheet designed by the invention is provided with the positioning holes with a specific function relation with the number of the magnetic poles, when a plurality of punching sheets are laminated into the rotor, the continuous and uniform oblique-pole rotor can be realized through the alignment of the corresponding positioning holes of different punching sheets, the rotor punching sheet is obviously different from the segmented and layered oblique-pole rotor in the prior art, and the rotor punching sheet has obvious effect of weakening the electromotive force harmonic wave with rich harmonic wave content.

Description

Rotor punching sheet, oblique-pole rotor, production method of oblique-pole rotor, motor and electric automobile
Technical Field
The invention belongs to the technical field of motors, and particularly relates to a rotor punching sheet, an oblique-pole rotor, a production method of the oblique-pole rotor, a motor and an electric automobile.
Background
The automobile driving motor is mostly a permanent magnet synchronous motor, the power density of the motor is high, the motor is small in size, and due to the special permanent magnet structure, the counter electromotive force harmonic content of the motor is high, the torque pulsation of the motor is large, the efficiency is low, the heat productivity of the stator and the rotor is large, and the magnetic steel is demagnetized very easily at high temperature.
The method that is used for reducing and eliminating the electromotive force harmonic of motor at present generally adopts is stator chute or rotor chute, wherein in the rotor chute design, mostly divide into two ends or three-section with the rotor punching, and the locating hole skew a certain angle of every section is positive, or is folded pressure backward. However, the segmented and layered oblique pole can only realize the segmented oblique pole with a specific angle, and has small effect on weakening electromotive force harmonic waves with rich harmonic content.
Disclosure of Invention
Therefore, the invention aims to solve the technical problems that the conventional rotor oblique pole can only realize a sectional oblique pole with a specific angle and has small effect on weakening electromotive force harmonic waves with rich harmonic wave content, thereby providing a rotor punching sheet, an oblique pole rotor, a production method thereof, a motor and an electric vehicle.
In order to solve the above problems, the present invention provides a rotor sheet, including:
the magnetic poles are uniformly arranged along the circumferential direction, and the number of the magnetic poles is X;
the positioning holes are uniformly arranged along the circumferential direction, and the number of the positioning holes is Y;
satisfy, Y ═ aX-1, where X > 2, a ═ 1,2,3 … … n.
The object of the present invention and the technical problems solved thereby can be further achieved by the following technical measures.
Preferably, the rotor punching sheet further comprises heat dissipation holes uniformly arranged along the circumferential direction, the number of the heat dissipation holes is Z, and the Z-Y is satisfied.
Preferably, the magnetic poles are provided with magnetic steel grooves, the magnetic steel grooves comprise a first magnetic steel groove and a second magnetic steel groove, the first magnetic steel groove and the second magnetic steel groove are arranged in a V shape, and/or permanent magnets are arranged in the magnetic steel grooves.
Preferably, the rotor punching sheet comprises 8 magnetic poles uniformly arranged along the circumferential direction and 15 positioning holes uniformly distributed along the circumferential direction.
The oblique polar rotor adopting the rotor punching sheet comprises at least two rotor punching sheets, wherein the rotor punching sheets are sequentially and axially laminated on the same side, the rotor punching sheets are circumferentially fixed through positioning holes, and the oblique polar angles of the two adjacent rotor punching sheets are theta0Satisfying the following formula (1),
Figure BDA0002596673950000021
in the above formula (1), X is the number of magnetic poles, and Y is the number of positioning holes.
Preferably, the number of the magnetic poles is 8, the number of the positioning holes is 15, and at least two rotor sheets are continuously inclined at an oblique polar angle of 3 degrees.
A method for producing the above-described skewed-pole rotor preferably includes:
any one of the at least two rotor punching sheets is used as a reference punching sheet;
circumferentially overlapping the rest of the at least two rotor punching sheets with the reference punching sheet;
all the rotor punching sheets rotate relative to the reference punching sheet, so that the circumferential deviation theta between each rotor punching sheet and the reference punching sheet 1Satisfying the following formula (2),
Figure BDA0002596673950000022
in the above formula (2), X is the number of magnetic poles, Y is the number of positioning holes, a is 1,2,3 … … n, b represents the spacing position between the rotor punching sheet and the reference punching sheet, b is 1 if the rotor punching sheet is adjacent to the reference punching sheet, b is 2 if the rotor punching sheet is separated from the reference punching sheet, and so on.
The object of the present invention and the technical problems solved thereby can be further achieved by the following technical measures.
Preferably, when all the other rotor punching sheets rotate relative to the reference punching sheet, the rotor punching sheets positioned on the same side of the reference punching sheet have the same rotating direction and are opposite to the rotating direction of the rotor punching sheets on the opposite side.
The utility model provides an above-mentioned rotor punching's oblique polar rotor, preferably, includes two at least rotor punching, and two at least rotor punching positive and negative sides alternate axial is folded and is pressed, and two at least rotor punching pass through locating hole circumference fixedly, and two adjacent rotor punching's oblique polar angle is theta3Satisfying the following formula (3),
Figure BDA0002596673950000023
in the above formula (3), X is the number of magnetic poles, and Y is the number of positioning holes.
The object of the present invention and the technical problems solved thereby can be further achieved by the following technical measures.
Preferably, the positioning holes of the at least two rotor punching sheets comprise M positioning holes and N positioning holes, wherein the M positioning holes and the N positioning holes are simultaneously positioned on the rotor punching sheets and have the diameter O coincident with the D axis 1Satisfies the following formula (4),
Figure BDA0002596673950000031
in the above formula (4), θMIs M locating hole and diameter O1Angle of (a) ofNIs N locating hole and diameter O1Y is the number of positioning holes, c is 1,3,5 … … n, θ3The oblique polar angles of two adjacent rotor punching sheets are provided.
Preferably, the number of the magnetic poles is 8, the number of the positioning holes is 15, and at least two rotor punching sheets are continuously inclined at an oblique polar angle of 1.5 degrees.
Preferably, θMEqual to 9.75 deg., thetaNEqual to 2.25.
A method for producing the above-described skewed-pole rotor preferably includes:
any one of the at least two rotor punching sheets is used as a reference punching sheet;
circumferentially overlapping the rest of the at least two rotor punching sheets with the reference punching sheet;
the rotor punching sheets with the interval of 1,3 and 5 … … n with the reference punching sheet rotate relative to the reference punching sheet, so that the circumferential deviation theta between each rotor punching sheet and the reference punching sheet is enabled to be1Satisfying the following formula (5),
Figure BDA0002596673950000032
in the above formula (5), a is 1,2,3 … … n, d represents the distance position between the rotor sheet and the reference sheet, if the distance between the rotor sheet and the reference sheet is 1, d is 1, if the distance between the rotor sheet and the reference sheet is 3, d is 2, and so on;
taking the rotor punching sheet with the interval of 0 with the reference punching sheet as a second reference punching sheet, and enabling the second reference punching sheet to be perpendicular to the diameter O 1Diameter O of2Turning over and rotating relative to the reference punching sheet to enable circumferential deviation theta between each rotor punching sheet and the reference punching sheet4Satisfying the following formula (6),
Figure BDA0002596673950000033
the rotor punching sheets with the interval of 1, 3 and 5 … … n with the second reference punching sheet rotate relative to the second reference punching sheet, so that the circumferential deviation theta between each rotor punching sheet and the second reference punching sheet is enabled to be5Satisfying the following formula (7),
Figure BDA0002596673950000034
in the above equation (7), a is 1,2,3 … … n, f denotes a position between the rotor sheet 1 and the second reference sheet, f is 1 if the rotor sheet is 1 from the second reference sheet, f is 2 if the rotor sheet is 3 from the second reference sheet, and so on.
The object of the present invention and the technical problems solved thereby can be further achieved by the following technical measures.
Preferably, when the rotor punching sheet rotates relative to the reference punching sheet, the rotor punching sheet located on the same side of the reference punching sheet has the same rotation direction and is opposite to the rotor punching sheet located on the opposite side.
A motor adopts the rotor punching sheet, or adopts the oblique pole rotor, or adopts the production method of the oblique pole rotor.
An electric automobile adopts the rotor punching sheet, or adopts the oblique pole rotor, or adopts the production method of the oblique pole rotor.
The rotor punching sheet, the oblique pole rotor, the production method of the oblique pole rotor, the motor and the electric automobile provided by the invention at least have the following beneficial effects:
the rotor punching sheet designed by the invention is provided with the positioning holes with a specific function relation with the number of the magnetic poles, when a plurality of punching sheets are laminated into the rotor, the continuous and uniform oblique-pole rotor can be realized through the alignment of the corresponding positioning holes of different punching sheets, the rotor punching sheet is obviously different from the segmented and layered oblique-pole rotor in the prior art, and the rotor punching sheet has obvious effect of weakening the electromotive force harmonic wave with rich harmonic wave content.
Drawings
Fig. 1 is a schematic structural diagram of a rotor sheet according to a first embodiment of the present invention;
fig. 2 is a schematic structural view of a skewed pole rotor according to a second embodiment of the invention;
FIG. 3 is an assembly view of a skewed pole rotor according to a second embodiment of the present invention;
fig. 4 is a schematic structural view of a skewed pole rotor according to a third embodiment of the invention;
fig. 5 is an assembly view of a skewed pole rotor according to a third embodiment of the invention.
The reference numerals are represented as:
1. rotor punching sheets; 2. a magnetic pole; 3. positioning holes; 4. heat dissipation holes; 5. a first magnetic steel slot; 6. a second magnetic steel slot; 8. m, positioning holes; 9. n positioning holes; 10. a first punching sheet; 11. a second punching sheet; 12. and a third punching sheet.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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 invention.
With reference to fig. 1, a first embodiment of the present application provides a rotor sheet 11, including: the magnetic poles 2 are uniformly arranged along the circumferential direction, and the number of the magnetic poles 2 is X; the positioning holes 3 are uniformly arranged along the circumferential direction, and the number of the positioning holes 3 is Y; satisfy, Y ═ aX-1, where X > 2, a ═ 1,2,3 … … n.
The rotor punching sheet 1 provided by the embodiment is provided with the positioning holes 3 with the number of the magnetic poles 2 in a specific functional relation, when a plurality of punching sheets are laminated into a rotor, continuous and uniform oblique-pole rotors can be realized through alignment of the corresponding positioning holes 3 of different punching sheets, and the rotor punching sheet is obviously different from segmented and layered oblique-pole rotors in the prior art. By selecting different coefficients a, a skewed pole rotor suitable for different skewed pole angles can be realized.
When the oblique-pole rotor is produced, the adjacent rotor punching sheets 1 need to rotate by a certain angle, and the positioning holes 3 of the two rotor punching sheets 1 after rotation are staggered due to unreasonable design of the positioning holes 3 in the conventional rotor punching sheet 1, so that the rotor cannot be axially fixed. In the design of the rotor sheet 1, the number of the magnetic poles 2 is an even number, such as 2, 4, 6, 8, and the like, taking the rotor sheet 1 with 8 magnetic poles 2 as an example, the interpolar angle is 45 °, when a is 2, the number of the positioning holes 3 is 15, all the positioning holes 3 divide the interpolar angle into fifteen equal parts, each part is 3 °, and when any two positioning holes 3 are aligned, the included angle between two adjacent rotor sheets 1 at the upper layer and the lower layer can be 3 °, 6 °, 9 °, and the like, so that the continuous oblique poles of the oblique-pole rotor can be realized only by optimally designing the positioning holes 3 on the rotor sheet 1.
On the other hand, the rotor sheet 1 that can be used for manufacturing the continuous oblique-pole rotor provided by the embodiment can realize continuous oblique poles only by one type, each type of sheet can realize oblique poles at different angles such as 3 degrees, 6 degrees and 9 degrees, the rotor sheet 1 has wider applicability, the sheet is easy to process and manufacture, and the design cost is reduced.
Preferably, the rotor sheet 1 further includes heat dissipation holes 4 uniformly arranged along the circumferential direction, and the number of the heat dissipation holes 4 is Z, and Z ═ Y is satisfied. In order to meet the heat dissipation requirement of the motor rotor, the rotor sheet 11 of the embodiment is further provided with the heat dissipation holes 4, the heat dissipation holes 4 are blocked due to the rotation of the rotor sheet 1 when the rotor sheet is in an oblique pole state, the number of the heat dissipation holes 4 is consistent with that of the positioning holes 3, so that the central angle of each adjacent heat dissipation hole 4 is equal to that of each positioning hole 3, no matter how the rotor sheet 1 rotates, when the positioning holes 3 are aligned, the heat dissipation holes 4 are necessarily in an aligned state, the heat dissipation holes 4 in the oblique pole rotor exist in a straight through hole mode, the heat dissipation of the oblique pole rotor is guaranteed, the heat dissipation efficiency of the rotor can be improved compared with the existing oblique pole rotor, and the motor performance is.
Preferably, the magnetic pole 2 is provided with a magnetic steel slot, the magnetic steel slot comprises a first magnetic steel slot 5 and a second magnetic steel slot 6, the first magnetic steel slot 5 and the second magnetic steel slot 6 are arranged in a V shape, and/or a permanent magnet is arranged in the magnetic steel slot.
Preferably, the rotor punching sheet 1 of the present embodiment includes 8 magnetic poles 2 uniformly arranged in the circumferential direction, and 15 positioning holes 3 uniformly distributed in the circumferential direction. The interpolar angle of the rotor punching sheets 1 is 45 degrees, when a is 2, the number of the positioning holes 3 is 15, all the positioning holes 3 divide the interpolar angle into fifteen equal parts, each part is 3 degrees, and the included angle between two adjacent rotor punching sheets 1 at the upper layer and the lower layer can be 3 degrees, 6 degrees and 9 degrees … … degrees, so that continuous oblique poles of the rotor are realized.
As shown in fig. 2, a second embodiment of the present application provides an oblique-pole rotor using the above rotor sheet, including at least two rotor sheets, at least two rotor sheets are sequentially and axially stacked on the same side, at least two rotor sheets are circumferentially fixed by a positioning hole, and an oblique-pole angle of two adjacent rotor sheets is θ0Satisfying the following formula (1),
Figure BDA0002596673950000061
in the above formula (1), X is the number of the magnetic poles 2, and Y is the number of the positioning holes 3.
Fig. 2 shows a skewed pole rotor comprising a first stamped sheet 10 and a second stamped sheet 11, the first stamped sheet 10 being shown in solid lines and the second stamped sheet 11 being shown in dashed lines. The first punching sheet 10 and the second punching sheet 11 are 8 magnetic poles and 15 positioning holes, and the above formula (1) can be written as
Figure BDA0002596673950000062
Then, the oblique polar angle θ of the first stamped piece 10 and the second stamped piece 11 after assembly0Is 3 deg.. When the oblique-pole rotor of the second embodiment includes more than two rotor sheets 1, all the rotor sheets 1 and the adjacent rotor sheets have an oblique-pole angle of 3 °, so as to form a continuous oblique-pole rotor with an oblique-pole angle of 3 °.
Compared with segmented and layered skewed poles, the continuous skewed pole rotor provided by the second embodiment of the application can effectively reduce the content of counter potential harmonic waves of the motor; the rotor punching sheet is assembled, so that the assembly efficiency is high, the punching sheet production process is simple, and the manufacturing cost of a product is saved; meanwhile, the continuous oblique pole at a specific angle can be easily realized, and the product has high applicability and high practicability.
As shown in fig. 3, a second embodiment of the present application further provides a method for producing a skewed pole rotor according to this embodiment, including:
step one, taking any one rotor punching sheet 1 of at least two rotor punching sheets 1 as a reference punching sheet, and defining a first punching sheet 10 as the reference punching sheet in the second embodiment;
step two, circumferentially overlapping the rest of the at least two rotor punching sheets 1 with a reference punching sheet, circumferentially overlapping the second punching sheet 11 with the first punching sheet 10 in the embodiment, namely overlapping the magnetic poles 2 and overlapping the positioning holes 3;
Thirdly, rotating the rest rotor punching sheets 1 relative to the reference punching sheet to enable circumferential deviation theta between each rotor punching sheet 1 and the reference punching sheet1Satisfying the following formula (2),
Figure BDA0002596673950000063
in the above formula (2), X is the number of the magnetic poles 2, Y is the number of the positioning holes 3, a is 1,2,3 … … n, b indicates the spacing position between the rotor sheet 1 and the reference sheet, b is 1 if the rotor sheet 1 is adjacent to the reference sheet, b is 2 if the rotor sheet 1 is separated from the reference sheet, and so on.
In the second embodiment, when X is 8, Y is 15, a is 2, the second stamped piece 11 is adjacent to the first stamped piece 10, and b is 1, the formula (2) is written as
Figure BDA0002596673950000064
The second punching sheet 11 needs to rotate 48 degrees relative to the first punching sheet 10, the second punching sheet 11 after rotation is overlapped with the first punching sheet 10, a magnetic pole 1 of the two punching sheets forms a 3-degree oblique polar angle, the positioning hole 3 and the heat dissipation hole 4 can be aligned, and axial cross-connection fixation and heat dissipation ventilation of the oblique-pole rotor are guaranteed.
In the second embodiment, if it is necessary to add a third punching sheet on the outer side of the second punching sheet 11, b is 2, θ1＝96°。
Preferably, in order to ensure that the assembled skewed-pole rotor is a continuous skewed pole, that is, all the magnetic poles 1 are consistent with the direction of the skewed pole angle of the punching sheet on the surface, when the rest of the rotor punching sheets 1 rotate relative to the reference punching sheet, the rotation directions of the rotor punching sheets 1 positioned on the same side of the reference punching sheet are the same, and are opposite to the rotation directions of the rotor punching sheets 1 on the opposite side. In the assembly example shown in fig. 3, the second stamped sheet 11 rotates clockwise, during assembly, the second stamped sheet 11 is located on the inner side of the first stamped sheet 10 perpendicular to the paper surface, and assuming that a new stamped sheet needs to be stacked on the outer side of the first stamped sheet 10 perpendicular to the paper surface, the rotation direction of the stamped sheet should be counterclockwise, so that the same inclination directions of the three stamped sheets can be ensured.
The oblique-pole rotor and the production method thereof provided by the second embodiment realize a continuous oblique-pole rotor, and the assembly method is simple and efficient, and can be used for automatic production. When the method is applied to an 8-pole motor, the minimum 3-degree continuous oblique pole can be realized, any oblique pole design with the multiple of 3 degrees is met, the applicability is high, and the method has obvious effect on weakening the electromotive force harmonic wave with rich harmonic wave content.
As shown in fig. 4, the embodiment of the application further provides a skewed-pole rotor of the rotor sheet 1, which includes at least two rotor sheets 1, wherein the positive and negative sides of the at least two rotor sheets 1 are alternately and axially stacked, the at least two rotor sheets 1 are circumferentially fixed by the positioning holes 3, and the skewed-pole angle of each two adjacent rotor sheets 1 is θ3Satisfying the following formula (3),
Figure BDA0002596673950000071
in the above formula (3), X is the number of the magnetic poles 2, and Y is the number of the positioning holes 3.
The oblique-pole rotor of the third embodiment of the application is an improvement made on the basis of the second embodiment, the third punching sheet 12 is additionally arranged between the first punching sheet 10 and the second punching sheet 11, and the third punching sheet 12 is just positioned on a middle parting line of an oblique pole angle, namely theta3＝θ0And/2, thereby achieving a smaller oblique polar angle.
Meanwhile, the first stamped steel 10 and the second stamped steel 11 meet the same side and same direction in the second embodiment, but the third stamped steel 12 needs to be on the opposite side, namely, turned over on the basis of the first stamped steel 10 and then overlapped between the first stamped steel 10 and the second stamped steel 11. If the direction of the first punching sheet 10 is positive, the direction of the third punching sheet 12 is negative, and the three punching sheets form a positive, negative and positive alternate assembly relationship.
For the rotor punching sheet with 8 poles and 15 positioning holes, formula (3) is written as
Figure BDA0002596673950000072
Then, theta31.5 degrees. The minimum oblique polar angle in the second embodiment is 3 degrees, while the minimum oblique polar angle in the third embodiment is 1.5 degrees, the oblique polar angle change of the second embodiment is integral multiple of 3 degrees, the oblique polar angle change of the third embodiment is multiple of 1.5 degrees, and the continuous oblique polar rotor of the third embodiment has richer oblique polar range.
Preferably, the positioning holes 3 of the at least two rotor sheets 1 include M positioning holes 8 and N positioning holes 9, wherein the M positioning holes 8 and the N positioning holes 9 are located on the rotor sheets 1 at the same time and have a diameter O coinciding with the axis D1Satisfies the following formula (4),
Figure BDA0002596673950000081
in the above formula (4), θMIs M locating hole 8 and diameter O1Angle of (a) ofNFor N positioning holes 9 and diameter O1Y is the number of positioning holes 3, c is 1,3,5 … … n, θ3And INT (Y/2) represents the maximum integer after dividing the number of the positioning holes by 2, wherein the number is the oblique polar angle of two adjacent rotor punching sheets 1.
When the diameter of the rotor punching sheet 1 is equal to the diameter O of the positioning hole 31When the included angle of the positioning holes meets the requirement of the formula (4), the included angle is defined as an M positioning hole and an N positioning hole.
When the oblique-pole rotor of the present embodiment includes 8 magnetic poles and 15 positioning holes, the oblique-pole angle θ3If c is 5, then equation (4) above can be written as:
Figure BDA0002596673950000082
Figure BDA0002596673950000083
To obtain thetaM＝9.75°，θNAt 2.25 °, at least two rotor sheets 1 are continuously inclined at a polar tilt angle of 1.5 °.
As shown in fig. 5, a third embodiment of the present application further provides a method for producing a skewed-pole rotor according to this embodiment, including:
step one, any one rotor punching sheet 1 of at least two rotor punching sheets 1 is taken as a reference punching sheet, and a first punching sheet 10 is taken as the reference punching sheet in the embodiment;
circumferentially overlapping the rest of the at least two rotor punching sheets 1 with a reference punching sheet, wherein in the embodiment, the second punching sheet 11 and the third punching sheet 13 are circumferentially overlapped with the first punching sheet 10, namely, the magnetic poles 2 are overlapped and the positioning holes 3 are overlapped;
thirdly, rotating the rotor punching sheets 1 which are spaced from the reference punching sheet by 1, 3 and 5 … … n relative to the reference punching sheet to enable circumferential deviation theta between each rotor punching sheet 1 and the reference punching sheet1Satisfying the following formula (5),
Figure BDA0002596673950000084
in the above formula (5), a is 1,2,3 … … n, d represents the distance position between the rotor sheet 1 and the reference sheet, if the distance between the rotor sheet 1 and the reference sheet is 1, d is 1, if the distance between the rotor sheet 1 and the reference sheet is 3, d is 2, and so on;
in this embodiment, if the distance between the second punching sheet 11 and the first punching sheet 10 is 1, d is 1, a is 2, and the above formula (5) can be written as
Figure BDA0002596673950000091
Then, the second stamped steel 11 rotates 48 ° relative to the first stamped steel 10, so as to obtain a slant polar angle θ between the second stamped steel 11 and the first stamped steel 100＝3°。
Fourthly, taking the rotor punching sheet 1 which is adjacent to the reference punching sheet with the interval of 0 as a second reference punching sheet, and enabling the second reference punching sheet to be perpendicular to the diameter O1Diameter O of2Turning over and rotating relative to the reference punching sheet to enable circumferential deviation theta between each rotor punching sheet 1 and the reference punching sheet4Satisfying the following formula (6),
Figure BDA0002596673950000092
in this embodiment, Y is 15, c is 5, and θ3When 1.5 °, equation (6) can be written as
Figure BDA0002596673950000093
Then, the third punching sheet 12 rotates 136.5 ° relative to the first punching sheet 10, so as to obtain a slant polar angle θ between the third punching sheet 12 and the first punching sheet 1031.5 degrees, and the oblique polar angle theta of the third punching sheet 12 and the second punching sheet 113＝1.5°。
Step five, rotating the rotor punching sheets 1 which are spaced from the second reference punching sheet by 1, 3 and 5 … … n relative to the second reference punching sheet, so that the circumferential deviation theta between each rotor punching sheet 1 and the second reference punching sheet 13 is enabled to be5Satisfying the following formula (7),
Figure BDA0002596673950000094
in the above equation (7), a is 1,2,3 … … n, f denotes a distance position between the rotor sheet 1 and the second reference sheet 13, f is 1 if the rotor sheet 1 and the second reference sheet are separated by 1, f is 2 if the rotor sheet 1 and the reference sheet are separated by 3, and so on.
In this embodiment, if a fourth punching sheet is added outside the second punching sheet 11, the distance between the fourth punching sheet and the third punching sheet 12 is 1, f is 1, a is 2, Y is 15, and equation (7) can be written as
Figure BDA0002596673950000095
Then, the fourth punching sheet rotates 48 ° relative to the third punching sheet 12, so that the oblique polar angle between the fourth punching sheet and the third punching sheet 12 is 3 °, and the oblique polar angle θ between the third punching sheet 12 and the first punching sheet 10 is obtained3The oblique polar angle between the fourth punching sheet and the first punching sheet 10 is 3 ° +1.5 ° -4.5 °, so that a continuous oblique polar of 1.5 ° is formed between the first punching sheet 10 and the fourth punching sheet.
The object of the present invention and the technical problems solved thereby can be further achieved by the following technical measures.
Preferably, when the rotor punching sheet 1 rotates relative to the reference punching sheet, the rotor punching sheet 1 located on the same side of the reference punching sheet has the same rotation direction, and the rotation direction of the rotor punching sheet 1 located on the opposite side is opposite to the rotation direction of the rotor punching sheet 1 located on the same side. In the third embodiment, the second punching sheet 11, the third punching sheet 12 and the fourth punching sheet are all arranged on the same side of the first punching sheet 10, specifically, the first punching sheet 10 is perpendicular to the inner side of the paper surface, and in the third step, the fourth step and the fifth step, the second punching sheet rotates clockwise.
The oblique-pole rotor and the production method thereof provided by the third embodiment realize a continuous oblique-pole rotor, and the assembly method is simple and efficient, and can be used for automatic production. When the method is applied to an 8-pole motor, the minimum continuous oblique pole of 1.5 degrees can be realized, the oblique pole design of any 1.5-degree multiple is met, the applicability is high, and the method has obvious effect on weakening the electromotive force harmonic wave with rich harmonic wave content.
A motor adopts the rotor punching sheet 1, or adopts the oblique pole rotor, or adopts the production method of the oblique pole rotor.
An electric automobile adopts the rotor punching sheet 1, or adopts the oblique pole rotor, or adopts the production method of the oblique pole rotor.
It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention. The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims (16)

1. A rotor punching sheet is characterized by comprising:
the magnetic poles (2) are uniformly arranged along the circumferential direction, and the number of the magnetic poles (2) is X;
the positioning holes (3) are uniformly arranged along the circumferential direction, and the number of the positioning holes (3) is Y;
Satisfy, Y ═ aX-1, where X > 2, a ═ 1,2,3 … … n.
2. The rotor punching sheet according to claim 1, wherein the rotor punching sheet (1) further comprises heat dissipation holes (4) uniformly arranged along the circumferential direction, the number of the heat dissipation holes (4) is Z, and Z-Y is satisfied.
3. The rotor punching sheet according to claim 1, wherein the magnetic poles (2) are provided with magnetic steel grooves, the magnetic steel grooves comprise a first magnetic steel groove and a second magnetic steel groove, the first magnetic steel groove and the second magnetic steel groove are arranged in a V shape, and/or permanent magnets are installed in the magnetic steel grooves.
4. The rotor punching sheet according to any one of claims 1 to 3, wherein the rotor punching sheet (1) comprises 8 magnetic poles (2) uniformly arranged along the circumferential direction and 15 positioning holes (3) uniformly distributed along the circumferential direction.
5. The oblique-pole rotor adopting the rotor punching sheet as claimed in any one of claims 1 to 4, characterized by comprising at least two rotor punching sheets (1), wherein the at least two rotor punching sheets (1) are sequentially and axially laminated on the same side, the at least two rotor punching sheets (1) are circumferentially fixed through the positioning holes (3), and the oblique-pole angle of two adjacent rotor punching sheets (1) is theta0Satisfying the following formula (1),
Figure FDA0002596673940000011
in the formula (1), X is the number of the magnetic poles (2), and Y is the number of the positioning holes (3).
6. The skewed pole rotor according to claim 5, wherein the number of the magnetic poles (2) is 8, the number of the positioning holes (3) is 15, and at least two rotor sheets (1) are continuously inclined at a 3 ° skewed pole angle.
7. A method of producing a skewed pole rotor as claimed in claim 5 or 6, comprising:
any one rotor punching sheet (1) of the at least two rotor punching sheets (1) is used as a reference punching sheet;
circumferentially superposing the rest rotor punching sheets (1) in the at least two rotor punching sheets (1) with the reference punching sheet;
the rest rotor punching sheets (1) are rotated relative to the reference punching sheet, so that the circumferential deviation theta between each rotor punching sheet (1) and the reference punching sheet is enabled1Satisfying the following formula (2),
Figure FDA0002596673940000012
in the above formula (2), b represents the distance between the rotor sheet (1) and the reference sheet, and if the rotor sheet (1) is adjacent to the reference sheet, b is 1, and if the rotor sheet (1) is separated from the reference sheet by one rotor sheet (1), b is 2, and so on.
8. The method for producing the oblique-pole rotor according to claim 7, wherein when the rest of the rotor laminations (1) rotate relative to the reference laminations, the rotor laminations (1) positioned on the same side of the reference laminations have the same rotation direction and are opposite to the rotor laminations (1) positioned on the opposite side.
9. The oblique-pole rotor adopting the rotor punching sheet as claimed in any one of claims 1 to 4, characterized by comprising at least two rotor punching sheets (1), wherein the front side and the back side of the at least two rotor punching sheets (1) are alternately and axially overlapped, the at least two rotor punching sheets (1) are circumferentially fixed through the positioning holes (3), and the oblique-pole angle of two adjacent rotor punching sheets (1) is theta3Satisfying the following formula (3),
Figure FDA0002596673940000021
in the formula (3), X is the number of the magnetic poles (2), and Y is the number of the positioning holes (3).
10. The skewed pole rotor as claimed in claim 9, wherein said alignment holes (3) of said at least two rotor sheets (1) comprise M alignment holes (8), N alignment holes(9) Wherein the M positioning hole (8) and the N positioning hole (9) are simultaneously positioned on the rotor punching sheet (1) and have a diameter O coincident with the D axis1Satisfies the following formula (4),
Figure FDA0002596673940000022
in the above formula (4), θMFor the M positioning hole (8) and the diameter O1Angle of (a) ofNFor the N positioning hole (9) and the diameter O1C is 1,3,5 … … n.
11. The skewed pole rotor according to claim 10, wherein the number of the magnetic poles (2) is 8, the number of the positioning holes (3) is 15, and at least two rotor laminations (1) are continuously inclined at a skewed pole angle of 1.5 °.
12. The skewed pole rotor as claimed in claim 11, wherein θ is θ MEqual to 9.75 deg., said thetaNEqual to 2.25.
13. A method of producing a skewed pole rotor as claimed in any of claims 9-12, comprising:
any one rotor punching sheet (1) of at least two rotor punching sheets (1) is used as a reference punching sheet;
circumferentially superposing the rest rotor punching sheets (1) in the at least two rotor punching sheets (1) with the reference punching sheet;
the rotor punching sheets (1) with the interval of 1, 3 and 5 … … n from the reference punching sheet rotate relative to the reference punching sheet, so that the circumferential deviation theta between each rotor punching sheet (1) and the reference punching sheet is enabled to be1Satisfying the following formula (5),
Figure FDA0002596673940000023
in the above formula (5), d represents the distance position between the rotor sheet (1) and the reference sheet, and if the distance between the rotor sheet (1) and the reference sheet is 1, d is 1, and if the distance between the rotor sheet (1) and the reference sheet is 3, d is 2, and so on;
taking the rotor punching sheet (1) with the interval of 0 with the reference punching sheet as a second reference punching sheet, and enabling the second reference punching sheet to be perpendicular to the diameter O1Diameter O of2Turning over and rotating relative to the reference punching sheet to enable each rotor punching sheet (1) to deviate from the reference punching sheet in the circumferential direction by theta4Satisfying the following formula (6),
Figure FDA0002596673940000031
rotating the rotor punching sheets (1) which are spaced from the second reference punching sheet by 1, 3 and 5 … … n relative to the second reference punching sheet to enable circumferential deviation theta between each rotor punching sheet (1) and the second reference punching sheet 5Satisfying the following formula (7),
Figure FDA0002596673940000032
in the above equation (7), f represents a distance position between the rotor sheet (1) and the second reference sheet, and if the distance between the rotor sheet (1) and the second reference sheet is 1, f is 1, and if the distance between the rotor sheet (1) and the second reference sheet is 3, f is 2, and so on.
14. The method for producing the oblique-pole rotor is characterized in that when the rotor punching (1) rotates relative to the reference punching, the rotor punching (1) positioned on the same side of the reference punching has the same rotation direction and is opposite to the rotor punching (1) positioned on the opposite side.
15. An electric machine, characterized in that, the rotor sheet of any one of claims 1-4 is adopted, or the oblique-pole rotor of any one of claims 5, 6, 9-12 is adopted, or the production method of the oblique-pole rotor of any one of claims 7, 8, 13, 14 is adopted.
16. An electric automobile, characterized in that, the rotor sheet of any claim 1-4 is adopted, or the oblique-pole rotor of any claim 5, 6, 9-12 is adopted, or the production method of the oblique-pole rotor of any claim 7, 8, 13, 14 is adopted.
CN202010711374.XA 2020-07-22 2020-07-22 Rotor punching sheet, oblique-pole rotor, production method of oblique-pole rotor, motor and electric automobile Pending CN111864939A (en)

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