Rotor punching sheet, skewed pole rotor and production method thereof, motor, and electric vehicle

Abstract

The present invention provides a rotor punching, a skewed-pole rotor and a production method thereof, a motor and an electric vehicle. The rotor punching comprises: magnetic poles uniformly arranged along the circumference, the number of magnetic poles being X; positioning holes uniformly arranged along the circumference, the number of positioning holes being Y; satisfying, Y=aX-1, wherein X>2, a=1,2,3...n. The rotor punching designed by the present invention is provided with positioning holes having a specific functional relationship with the number of magnetic poles. When a plurality of punchings are stacked into a rotor, a continuous and uniform skewed-pole rotor can be realized by aligning the corresponding positioning holes of different punchings. This is significantly different from the segmented and layered skewed-pole rotors in the prior art, and has a significant effect on weakening harmonics of electromotive force rich in harmonic content.

Description

Technical Field

[0001] The invention belongs to the technical field of motors, and in particular relates to a rotor punching sheet, a skewed-pole rotor and a production method thereof, a motor, and an electric vehicle. Background Art

[0002] Most automobile drive motors are permanent magnet synchronous motors, which have high power density and small size. However, due to their special permanent magnet structure, the motor has high back-EMF harmonic content, large torque pulsation, low efficiency, high heat generation in the stator and rotor, and the magnetic steel is very easy to demagnetize at high temperatures.

[0003] The commonly used method for reducing and eliminating the electromotive force harmonics of the motor is stator skew slots or rotor skew slots. In the rotor skew slot design, the rotor punching is usually divided into two ends or three sections, and the positioning holes of each section are offset at a certain angle to stack positively or reversely. However, this segmented and layered skew pole can only achieve segmented skew poles at a specific angle, and has little effect on weakening the electromotive force harmonics with rich harmonic content. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is that the existing rotor skew can only achieve segmented skew at a specific angle, which has little effect on weakening the harmonics of the electromotive force with rich harmonic content, thereby providing a rotor punching, a skewed pole rotor and its production method, a motor, and an electric car.

[0005] In order to solve the above problems, the present invention provides a rotor punching sheet, comprising:

[0006] The magnetic poles are evenly arranged along the circumference, and the number of magnetic poles is X;

[0007] Positioning holes are evenly arranged along the circumference, and the number of the positioning holes is Y;

[0008] It satisfies that Y=aX-1, where X>2, a=1,2,3…n.

[0009] The purpose of the present invention and the solution to its technical problems can be further achieved by adopting the following technical measures.

[0010] Preferably, the rotor punching also includes heat dissipation holes evenly arranged along the circumferential direction, and the number of the heat dissipation holes is Z, satisfying Z=Y.

[0011] Preferably, a magnetic steel groove is provided on the magnetic pole, the magnetic steel groove includes 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 a permanent magnet is installed in the magnetic steel groove.

[0012] Preferably, the rotor punching includes 8 magnetic poles evenly arranged along the circumferential direction and 15 positioning holes evenly distributed along the circumferential direction.

[0013] A skewed pole rotor using the above rotor punching comprises at least two rotor punchings, at least two rotor punchings are axially stacked in sequence on the same side, at least two rotor punchings are circumferentially fixed by positioning holes, and the skewed pole angle of two adjacent rotor punchings is θ 0 , satisfies the following formula (1),

[0014]

[0015] In the above formula (1), X is the number of magnetic poles, and Y is the number of positioning holes.

[0016] Preferably, the number of magnetic poles is 8, the number of positioning holes is 15, and at least two rotor punchings are continuously inclined at a 3° oblique pole angle.

[0017] A method for producing the above-mentioned skew-pole rotor preferably comprises:

[0018] Using any one of the at least two rotor punchings as a reference punching;

[0019] Circumferentially align the remaining rotor punchings of the at least two rotor punchings with the reference punching;

[0020] The remaining rotor punchings are rotated relative to the reference punching, so that each rotor punching has a circumferential deviation of θ from the reference punching 1 , satisfies the following formula (2),

[0021]

[0022] In the above formula (2), X is the number of magnetic poles, Y is the number of positioning holes, a=1, 2, 3...n, b represents the spacing between the rotor punching and the reference punching. If the rotor punching is adjacent to the reference punching, b=1; if the rotor punching is separated from the reference punching by one rotor punching, b=2, and so on.

[0023] The purpose of the present invention and the solution to its technical problems can be further achieved by adopting the following technical measures.

[0024] Preferably, when the remaining rotor punches are rotated relative to the reference punch, the rotor punches on the same side of the reference punch rotate in the same direction and in the opposite direction to the rotor punches on the opposite side.

[0025] The above-mentioned oblique pole rotor of the rotor punching preferably comprises at least two rotor punchings, the front and back sides of the at least two rotor punchings are alternately axially stacked, the at least two rotor punchings are circumferentially fixed by positioning holes, and the oblique pole angle of two adjacent rotor punchings is θ 3 , satisfies the following formula (3),

[0026]

[0027] In the above formula (3), X is the number of magnetic poles, and Y is the number of positioning holes.

[0028] The purpose of the present invention and the solution to its technical problems can be further achieved by adopting the following technical measures.

[0029] Preferably, the positioning holes of at least two rotor punchings include an M positioning hole and an N positioning hole, wherein the M positioning hole and the N positioning hole are both located at a diameter O on the rotor punching that coincides with the D axis. 1 On the same side of , the following formula (4) is satisfied:

[0030]

[0031] In the above formula (4), θ M M is the locating hole with diameter O 1 The angle, θ N N is the locating hole with diameter O 1 The angle between the two holes is θ, Y is the number of positioning holes, c = 1, 3, 5...n, θ 3 is the skew angle of two adjacent rotor punchings.

[0032] Preferably, the number of magnetic poles is 8, the number of positioning holes is 15, and at least two rotor punchings are continuously inclined at a skew angle of 1.5°.

[0033] Preferably, θ M = 9.75°, θ N Equal to 2.25°.

[0034] A method for producing the above-mentioned skew-pole rotor preferably comprises:

[0035] Using any one of the at least two rotor punchings as a reference punching;

[0036] Circumferentially align the remaining rotor punchings of the at least two rotor punchings with the reference punching;

[0037] Rotate the rotor punchings with intervals of 1, 3, 5, ... n from the reference punchings relative to the reference punchings so that the circumferential deviation of each rotor punching from the reference punching is θ 1 , satisfies the following formula (5),

[0038]

[0039] In the above formula (5), a=1, 2, 3...n, d represents the interval between the rotor punching and the reference punching. If the interval between the rotor punching and the reference punching is 1, then d=1; if the interval between the rotor punching and the reference punching is 3, then d=2, and so on.

[0040] The rotor punching sheet with a spacing of 0 from the reference punching sheet is used as the second reference punching sheet.1 The diameter O 2 Flip and rotate relative to the reference punching sheet so that each rotor punching sheet has a circumferential deviation of θ from the reference punching sheet. 4 , satisfies the following formula (6),

[0041]

[0042] Rotate the rotor punchings with intervals of 1, 3, 5, ... n from the second reference punchings relative to the second reference punchings so that the circumferential deviation of each rotor punching from the second reference punching is θ 5 , satisfies the following formula (7),

[0043]

[0044] In the above formula (7), a=1, 2, 3...n, f represents the interval between the rotor punching 1 and the second reference punching. If the interval between the rotor punching and the second reference punching is 1, then f=1; if the interval between the rotor punching and the second reference punching is 3, then f=2, and so on.

[0045] The purpose of the present invention and the solution to its technical problems can be further achieved by adopting the following technical measures.

[0046] Preferably, when the rotor punching is rotated relative to the reference punching, the rotor punchings on the same side of the reference punching rotate in the same direction and in the opposite direction to the rotor punchings on the opposite side.

[0047] A motor adopts the rotor punching sheet, or adopts the skewed pole rotor, or adopts the production method of the skewed pole rotor.

[0048] An electric vehicle adopts the rotor punching sheet, or adopts the skewed pole rotor, or adopts the production method of the skewed pole rotor.

[0049] The rotor punching sheet, skewed pole rotor and production method thereof, motor and electric vehicle provided by the present invention have at least the following beneficial effects:

[0050] The rotor punchings designed in the present invention are provided with positioning holes having a specific functional relationship with the number of magnetic poles. When multiple punchings are stacked into a rotor, a continuous and uniform skewed-pole rotor can be achieved by aligning the corresponding positioning holes of different punchings. This is significantly different from the segmented and layered skewed-pole rotors in the prior art and has an obvious effect on weakening the harmonics of the electromotive force with rich harmonic content. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 It is a schematic structural diagram of a rotor punching sheet according to a first embodiment of the present invention;

[0052] Figure 2 Schematic diagram of the structure of the skew-pole rotor according to the second embodiment of the present invention;

[0053] Figure 3 It is a schematic diagram of the assembly of the skew-pole rotor according to the second embodiment of the present invention;

[0054] Figure 4 Schematic diagram of the structure of the skew-pole rotor according to the third embodiment of the present invention;

[0055] Figure 5 This is a schematic diagram of the assembly of the skew-pole rotor of the third embodiment of the present invention.

[0056] The reference numerals are:

[0057] 1. Rotor punching sheet; 2. Magnetic pole; 3. Positioning hole; 4. Heat dissipation hole; 5. First magnetic steel slot; 6. Second magnetic steel slot; 8. M positioning hole; 9. N positioning hole; 10. First punching sheet; 11. Second punching sheet; 12. Third punching sheet. DETAILED DESCRIPTION

[0058] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0059] Combination Figure 1 As shown, embodiment 1 of the present application provides a rotor punching sheet 11, including: magnetic poles 2 evenly arranged along the circumferential direction, the number of magnetic poles 2 is X; positioning holes 3 evenly arranged along the circumferential direction, the number of positioning holes 3 is Y; satisfying, Y = aX-1, where X>2, a=1,2,3……n.

[0060] The rotor punching 1 provided in this embodiment is provided with positioning holes 3 having a specific functional relationship with the number of magnetic poles 2. When a plurality of punchings are stacked into a rotor, a continuous and uniform skewed pole rotor can be realized by aligning the corresponding positioning holes 3 of different punchings, which is significantly different from the segmented and layered skewed pole rotors in the prior art. By selecting different coefficients a, skewed pole rotors suitable for different skewed pole angles can be realized.

[0061] When producing a skewed-pole rotor, it is necessary to rotate adjacent rotor punchings 1 by a certain angle. In the existing rotor punchings 1, due to the unreasonable design of the positioning holes 3, the positioning holes 3 of the two rotor punchings 1 are staggered after the rotation, resulting in the inability to axially fix the rotor. In the design of the rotor punching 1, the magnetic poles 2 are an even number such as 2, 4, 6, 8, etc. Taking the rotor punching 1 with 8 magnetic poles 2 as an example, the inter-pole angle is 45°. When a=2, there are 15 positioning holes 3. All positioning holes 3 divide the inter-pole angle into fifteen equal parts, each of which is 3°. When any two positioning holes 3 are aligned, the angle between the two adjacent rotor punchings 1 in the upper and lower layers can be 3°, 6°, 9°, etc., so that the continuous skew of the skewed-pole rotor can be achieved only by optimizing the design of the positioning holes 3 on the rotor punching 1.

[0062] On the other hand, the rotor punching sheet 1 provided in this embodiment can be used to manufacture a continuous skewed pole rotor. Only one type of punching sheet is needed to achieve continuous skewed poles, and each type of punching sheet can achieve skewed poles at different angles such as 3°, 6°, and 9°. The rotor punching sheet 1 has a wider applicability, and the processing and manufacturing of the punching sheet is simple, which reduces the design cost.

[0063] Preferably, the rotor punching 1 also includes heat dissipation holes 4 uniformly arranged along the circumferential direction, and the number of heat dissipation holes 4 is Z, satisfying Z=Y. In order to meet the heat dissipation requirements of the motor rotor, the rotor punching 11 of this embodiment is also provided with heat dissipation holes 4. At the same time, in order to prevent the heat dissipation holes 4 from being blocked due to the rotation of the rotor punching 1 when the poles are tilted, the number of heat dissipation holes 4 is consistent with the number of positioning holes 3, so that the center angles of adjacent heat dissipation holes 4 are equal to the center angles of the positioning holes 3. No matter how the rotor punching 1 rotates, when the positioning holes 3 are aligned, the heat dissipation holes 4 must also be in an aligned state. The heat dissipation holes 4 in the tilted pole rotor exist in the form of straight through holes to ensure the heat dissipation of the tilted pole rotor. Compared with the existing tilted pole rotor, it can improve the heat dissipation efficiency of the rotor and improve the motor performance.

[0064] Preferably, a magnetic steel slot is provided on the magnetic pole 2, and the magnetic steel slot includes 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 installed in the magnetic steel slot.

[0065] Preferably, the rotor sheet 1 of this embodiment includes 8 magnetic poles 2 evenly arranged in the circumferential direction and 15 positioning holes 3 evenly distributed in the circumferential direction. The inter-pole angle of the rotor sheet 1 is 45°. When a=2, there are 15 positioning holes 3. All positioning holes 3 divide the inter-pole angle into 15 equal parts, each of which is 3°. The angle between two adjacent rotor sheets 1 in the upper and lower layers can be assembled at an angle of 3°, 6°, 9°, etc., to achieve continuous skewed poles of the rotor.

[0066] like Figure 2As shown, the second embodiment of the present application provides a skewed pole rotor using the above rotor punching, including at least two rotor punchings, at least two rotor punchings are axially stacked in sequence on the same side, at least two rotor punchings are circumferentially fixed by positioning holes, and the skewed pole angle of two adjacent rotor punchings is θ 0 , satisfies the following formula (1),

[0067]

[0068] In the above formula (1), X is the number of magnetic poles 2 , and Y is the number of positioning holes 3 .

[0069] Figure 2 The figure shows a skewed pole rotor including a first punching sheet 10 and a second punching sheet 11. The first punching sheet 10 is shown in solid lines, and the second punching sheet 11 is shown in dotted lines. The first punching sheet 10 and the second punching sheet 11 both have 8 magnetic poles and 15 positioning holes. The above formula (1) can be written as

[0070]

[0071] Then, the oblique polar angle θ of the first punching sheet 10 and the second punching sheet 11 after assembly is 0 When the skewed pole rotor of the second embodiment includes more than two rotor punchings 1, all rotor punchings 1 have a skew angle of 3° with adjacent rotor punchings, thereby forming a continuous skewed pole rotor with a skew angle of 3°.

[0072] The continuous skewed pole rotor provided in Example 2 of the present application can effectively reduce the harmonic content of the motor's back-electromotive force compared to the segmented and layered skewed poles; it is assembled through a rotor punching sheet, with extremely high assembly efficiency and a simple punching sheet production process, saving product manufacturing costs; at the same time, it can easily achieve continuous skewed poles at a specific angle, and the product has strong applicability and high practicality.

[0073] like Figure 3 As shown, the second embodiment of the present application also provides a method for producing the skewed pole rotor of this embodiment, comprising:

[0074] Step 1: use any one of the at least two rotor punchings 1 as a reference punching. In the second embodiment, the first punching 10 is defined as the reference punching.

[0075] Step 2: First, the remaining rotor punchings 1 of at least two rotor punchings 1 are circumferentially overlapped with the reference punching. In this embodiment, the second punching 11 is circumferentially overlapped with the first punching 10, that is, the magnetic poles 2 are overlapped and the positioning holes 3 are also overlapped;

[0076] Step 3: Rotate the remaining rotor punchings 1 relative to the reference punching so that the circumferential deviation between each rotor punching 1 and the reference punching is θ 1 , satisfies the following formula (2),

[0077]

[0078] In the above formula (2), X is the number of magnetic poles 2, Y is the number of positioning holes 3, a=1, 2, 3...n, b represents the spacing between rotor punching 1 and reference punching. If rotor punching 1 is adjacent to reference punching, b=1; if rotor punching 1 is separated from reference punching by one rotor punching 1, b=2, and so on.

[0079] In the second embodiment, X=8, Y=15, a=2, and the second punching plate 11 is adjacent to the first punching plate 10, then b=1, and the formula (2) is written as

[0080]

[0081] That is to say, the second punching plate 11 needs to be rotated 48° relative to the first punching plate 10. After the rotation, the second punching plate 11 is superimposed on the first punching plate 10, so that the magnetic poles 1 of the two punching plates form a 3° oblique polar angle, and the positioning hole 3 and the heat dissipation hole 4 can be kept aligned to ensure the axial penetration fixation and heat dissipation and ventilation of the oblique pole rotor.

[0082] In the second embodiment, if a third punching plate is required to be added outside the second punching plate 11, then b=2, θ 1 =96°.

[0083] Preferably, to ensure that the assembled skewed rotor is continuously skewed, that is, all the magnetic poles 1 have the same skew angle direction relative to the surface of the punching sheet, when the remaining rotor punching sheets 1 are rotated relative to the reference punching sheet, the rotor punching sheets 1 on the same side of the reference punching sheet rotate in the same direction, and in the opposite direction to the rotor punching sheets 1 on the opposite side. Figure 3 In the assembly example shown, the second punch 11 rotates clockwise. During assembly, the second punch 11 is located on the inner side of the first punch 10 perpendicular to the paper surface. Assuming that a new punch needs to be stacked on the outer side of the first punch 10 perpendicular to the paper surface, the rotation direction of the punch should be counterclockwise to ensure that the inclination directions of the three punches are the same.

[0084] The skewed pole rotor and its production method provided in the second embodiment realize a continuous skewed pole rotor, and its assembly method is simple and efficient, and can be used for automated production. When applied to an 8-pole motor, a minimum continuous skew of 3° can be achieved, and any skewed pole design of multiples of 3° can be satisfied, which has high applicability and has an obvious effect on weakening harmonics of electromotive force rich in harmonic content.

[0085] like Figure 4As shown, the third embodiment of the present application further provides a skewed pole rotor of the above rotor punching sheet 1, comprising at least two rotor punching sheets 1, at least two rotor punching sheets 1 are alternately axially stacked on the front and back sides, at least two rotor punching sheets 1 are circumferentially fixed by positioning holes 3, and the skewed pole angle of two adjacent rotor punching sheets 1 is θ 3 , satisfies the following formula (3),

[0086]

[0087] In the above formula (3), X is the number of magnetic poles 2, and Y is the number of positioning holes 3.

[0088] The oblique pole rotor of the third embodiment of the present application is an improvement made on the basis of the second embodiment, by adding a third punching sheet 12 between the first punching sheet 10 and the second punching sheet 11, and the third punching sheet 12 is exactly located on the midline of the oblique pole angle, that is, θ 3 =θ 0 / 2, thereby achieving a smaller oblique polar angle.

[0089] At the same time, the first punching sheet 10 and the second punching sheet 11 meet the same side and same direction in the second embodiment, but the third punching sheet 12 needs to be on the opposite side, that is, it is flipped on the basis of the first punching sheet 10 and then superimposed between the first punching sheet 10 and the second punching sheet 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 an alternating assembly relationship of positive, negative, and positive.

[0090] For a rotor lamination with 8 poles and 15 locating holes, equation (3) can be written as

[0091]

[0092] Then, θ 3 =1.5°. The minimum skew angle in the second embodiment is 3°, while the minimum skew angle in the third embodiment is 1.5°. The skew angle variation in the second embodiment is an integer multiple of 3°, while the skew angle variation in the third embodiment is a multiple of 1.5°. The continuous skew pole rotor of the present embodiment has a richer skew pole range.

[0093] Preferably, the positioning holes 3 of at least two rotor punchings 1 include an M positioning hole 8 and an N positioning hole 9, wherein the M positioning hole 8 and the N positioning hole 9 are both located at a diameter O on the rotor punching 1 that coincides with the D axis. 1 On the same side of , the following formula (4) is satisfied:

[0094]

[0095] In the above formula (4), θ M For M positioning hole 8 and diameter O 1 The angle, θ N N is the location hole 9 with diameter O 1The angle of Y is the number of positioning holes 3, c = 1, 3, 5...n, θ 3 is the oblique polar angle of two adjacent rotor punching sheets 1, and INT(Y / 2) represents the maximum integer obtained by dividing the number of positioning holes by 2.

[0096] When the positioning hole 3 of the rotor punching 1 has a diameter O 1 When the included angle of the two positioning holes meets the requirements of formula (4), they are defined as M positioning hole and N positioning hole.

[0097] In this embodiment, when the skew pole rotor includes 8 magnetic poles and 15 positioning holes, the skew pole angle θ 3 =1.5°, c=5, then the above formula (4) can be written as:

[0098]

[0099]

[0100] Find, θ M =9.75°,θ N =2.25°, at this time, at least two rotor punchings 1 are continuously inclined at an oblique polar angle of 1.5°.

[0101] like Figure 5 As shown, the third embodiment of the present application also provides a method for producing the skewed pole rotor of this embodiment, comprising:

[0102] Step 1: use any one of the at least two rotor punchings 1 as a reference punching. In this embodiment, the first punching 10 is used as the reference punching.

[0103] Step 2: Circumferentially overlap the remaining rotor sheets 1 of at least two rotor sheets 1 with the reference sheet. In this embodiment, the second sheet 11 and the third sheet 13 are circumferentially overlapped with the first sheet 10, that is, the magnetic poles 2 are overlapped and the positioning holes 3 are overlapped;

[0104] Step 3: Rotate the rotor punching 1 with intervals of 1, 3, 5, ... n from the reference punching relative to the reference punching, so that the circumferential deviation of each rotor punching 1 and the reference punching is θ 1 , satisfies the following formula (5),

[0105]

[0106] In the above formula (5), a=1, 2, 3...n, d represents the interval between the rotor punching 1 and the reference punching. If the interval between the rotor punching 1 and the reference punching is 1, then d=1; if the interval between the rotor punching 1 and the reference punching is 3, then d=2, and so on.

[0107] In this embodiment, the interval between the second punching plate 11 and the first punching plate 10 is 1, then d = 1, a = 2, and the above formula (5) can be written as

[0108]

[0109] Then, the second punching plate 11 is rotated 48° relative to the first punching plate 10, and the oblique polar angle θ between the second punching plate 11 and the first punching plate 10 is obtained. 0 =3°.

[0110] Step 4: Use rotor punching 1, which is adjacent to the reference punching sheet and has a spacing of 0, as the second reference punching sheet. 1 The diameter O 2 Flip and rotate relative to the reference punching sheet, so that each rotor punching sheet 1 has a circumferential deviation of θ from the reference punching sheet 4 , satisfies the following formula (6),

[0111]

[0112] In this embodiment, Y=15, c=5, θ 3 =1.5°, then equation (6) can be written as

[0113]

[0114] Then, the third punching plate 12 rotates 136.5° relative to the first punching plate 10, and the oblique polar angle θ between the third punching plate 12 and the first punching plate 10 is obtained. 3 =1.5°, at the same time, the oblique polar angle θ between the third punching plate 12 and the second punching plate 11 3 =1.5°.

[0115] Step 5: Rotate the rotor sheet 1 with a spacing of 1, 3, 5, ... n from the second reference sheet relative to the second reference sheet, so that each rotor sheet 1 has a circumferential deviation of θ from the second reference sheet 13. 5 , satisfies the following formula (7),

[0116]

[0117] In the above formula (7), a=1, 2, 3...n, f represents the interval between the rotor punching 1 and the second reference punching 13. If the interval between the rotor punching 1 and the second reference punching is 1, then f=1; if the interval between the rotor punching 1 and the reference punching is 3, then f=2, and so on.

[0118] In this embodiment, if a fourth punch is added outside the second punch 11, the interval between the fourth punch and the third punch 12 is 1, f = 1, a = 2, Y = 15, and formula (7) can be written as

[0119]

[0120] Then, the fourth punch is rotated 48° relative to the third punch 12, and the oblique polar angle between the fourth punch and the third punch 12 is 3°. The oblique polar angle between the third punch 12 and the first punch 10 is θ 3 =1.5°, so the oblique pole angle between the fourth punching sheet and the first punching sheet 10 is 3°+1.5°=4.5°, thereby forming a continuous oblique pole of 1.5° between the first punching sheet 10 to the fourth punching sheet.

[0121] The purpose of the present invention and the solution to its technical problems can be further achieved by adopting the following technical measures.

[0122] Preferably, when the rotor punching 1 is rotated relative to the reference punching, the rotor punching 1 on the same side of the reference punching rotates in the same direction and in the opposite direction to the rotor punching 1 on the opposite side. In the third embodiment, the second punching 11, the third punching 12, and the fourth punching are all arranged on the same side of the first punching 10, specifically, the first punching 10 is perpendicular to the inner side of the paper surface, and the rotation is clockwise in steps 3, 4, and 5.

[0123] The skewed pole rotor and its production method provided in the third embodiment realize a continuous skewed pole rotor, and its assembly method is simple and efficient, and can be used for automated production. When applied to an 8-pole motor, a minimum continuous skew of 1.5° can be achieved, and any skewed pole design with a multiple of 1.5° can be satisfied, which has high applicability and has a significant effect on weakening harmonics of electromotive force with rich harmonic content.

[0124] A motor adopts the rotor punching sheet 1, or adopts the skewed-pole rotor, or adopts the production method of the skewed-pole rotor.

[0125] An electric vehicle adopts the rotor punching sheet 1, or adopts the skewed-pole rotor, or adopts the production method of the skewed-pole rotor.

[0126] It is easy for those skilled in the art to understand that the above-mentioned advantageous methods can be freely combined and superimposed without conflict.

[0127] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention, and these improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A skew-pole rotor, It is characterized in that include: A rotor punching sheet (1), the rotor punching sheet (1) comprising magnetic poles (2) evenly arranged in the circumferential direction and positioning holes (3) evenly arranged in the circumferential direction, the number of the magnetic poles (2) being X, and the number of the positioning holes (3) being Y; Satisfies, Y = aX-1, where X>2, a = 1, 2, 3...n; The number of the rotor punching sheets (1) is at least two, the at least two rotor punching sheets (1) are axially stacked in sequence on the same side, the at least two rotor punching sheets (1) are circumferentially fixed through the positioning holes (3), and the oblique polar angle of two adjacent rotor punching sheets (1) is θ 0 , satisfies the following formula (1), In the above formula (1), X is the number of magnetic poles (2), and Y is the number of positioning holes (3); Alternatively, the number of the rotor punching sheets (1) is at least two, the front and rear sides of the at least two rotor punching sheets (1) are alternately axially stacked, the at least two rotor punching sheets (1) are circumferentially fixed through the positioning holes (3), and the oblique polar angle of two adjacent rotor punching sheets (1) is θ 3 , satisfies the following formula (3), In the above formula (3), X is the number of magnetic poles (2), and Y is the number of positioning holes (3); By aligning the corresponding positioning holes (3) of different rotor punching sheets (1), a continuous and uniform skewed-pole rotor can be achieved.

2. The skewed pole rotor according to claim 1, It is characterized in that 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) being Z, and satisfying Z=Y.

3. The skewed pole rotor according to claim 1, It is characterized in that The magnetic pole (2) is provided with a magnetic steel groove, the magnetic steel groove comprises 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 a permanent magnet is installed in the magnetic steel groove.

4. The skewed pole rotor according to claim 1, It is characterized in that The rotor punching sheet (1) comprises 8 magnetic poles (2) evenly arranged in the circumferential direction and 15 positioning holes (3) evenly distributed in the circumferential direction.

5. The skewed pole rotor according to claim 1, It is characterized in that When the at least two rotor punching sheets (1) are axially stacked in sequence on the same side, the number of the magnetic poles (2) is 8, the number of the positioning holes (3) is 15, and the at least two rotor punching sheets (1) are continuously inclined at an oblique polar angle of 3°.

6. The skewed pole rotor according to claim 1, It is characterized in that When the front and rear sides of the at least two rotor punching sheets (1) are alternately axially stacked, the positioning holes (3) of the at least two rotor punching sheets (1) include an M positioning hole (8) and an N positioning hole (9), wherein the M positioning hole (8) and the N positioning hole (9) are both located at a diameter O on the rotor punching sheet (1) that coincides with the D axis. 1 On the same side of , the following formula (4) is satisfied: In the above formula (4), θ M The M positioning hole (8) has a diameter O 1 The angle, θ N The N positioning hole (9) has a diameter O 1 The angle is c=1,3,5…n.

7. The skewed-pole rotor according to claim 6, It is characterized in that The number of the magnetic poles (2) is 8, the number of the positioning holes (3) is 15, and at least two rotor punching sheets (1) are continuously inclined at an oblique polar angle of 1.5°.

8. The skewed-pole rotor according to claim 7, It is characterized in that The θ M is equal to 9.75°, the θ N Equal to 2.25°.

9. A method for producing a skewed pole rotor according to any one of claims 1 to 5, It is characterized in that When the at least two rotor punching sheets (1) are axially stacked in sequence on the same side, the method comprises: Using any one of the at least two rotor punchings (1) as a reference punching; Circumferentially aligning the remaining rotor punchings (1) of the at least two rotor punchings (1) with the reference punching; The remaining rotor punchings (1) are rotated relative to the reference punching, so that each rotor punching (1) has a circumferential deviation θ from the reference punching 1 , satisfies the following formula (2), In the above formula (2), b represents the interval between the rotor punching (1) and the reference punching. If the rotor punching (1) is adjacent to the reference punching, b=1; if the rotor punching (1) is separated from the reference punching by one rotor punching (1), b=2, and so on.

10. The method for producing a skewed pole rotor according to claim 9, It is characterized in that When the remaining rotor punches (1) are rotated relative to the reference punch, the rotor punches (1) located on the same side of the reference punch rotate in the same direction and in the opposite direction to the rotor punches (1) on the opposite side.

11. A method for producing a skewed-pole rotor according to any one of claims 1 to 4 and 6 to 8, It is characterized in that When the front and back sides of the at least two rotor punching sheets (1) are alternately axially stacked, the method comprises: Using any one of at least two rotor punchings (1) as a reference punching; The remaining rotor punchings (1) of the at least two rotor punchings (1) are circumferentially overlapped with the reference punching; Rotate the rotor punching (1) with a spacing of c=1, 3, 5...n from the reference punching relative to the reference punching, so that the circumferential deviation of each rotor punching (1) from the reference punching is θ 1 , satisfies the following formula (5), In the above formula (5), d represents the interval between the rotor punching (1) and the reference punching. If the interval between the rotor punching (1) and the reference punching is 1, then d=1; if the interval between the rotor punching (1) and the reference punching is 3, then d=2, and so on. The rotor punching sheet (1) with a spacing of 0 from the reference punching sheet is used as the second reference punching sheet. The second reference punching sheet is placed perpendicular to the diameter O 1 The diameter O 2 Flip and rotate relative to the reference punching sheet so that each rotor punching sheet (1) has a circumferential deviation of θ from the reference punching sheet. 4 , satisfies the following formula (6), Rotate the rotor punching (1) with a spacing of c=1, 3, 5...n from the second reference punching relative to the second reference punching, so that each rotor punching (1) has a circumferential deviation θ from the second reference punching 5 , satisfies the following formula (7), In the above formula (7), f represents the interval between the rotor punching (1) and the second reference punching. If the interval between the rotor punching (1) and the second reference punching is 1, then f=1; if the interval between the rotor punching (1) and the second reference punching is 3, then f=2, and so on.

12. The method for producing a skewed pole rotor according to claim 11, It is characterized in that When the rotor punching (1) is rotated relative to the reference punching, the rotor punching (1) located on the same side of the reference punching rotates in the same direction and in the opposite direction to the rotor punching (1) on the opposite side.

13. A motor, It is characterized in that A method for producing a skewed pole rotor using any one of claims 1 to 5, 6 to 8, or any one of claims 9, 10, 11, and 12.

14. An electric vehicle, It is characterized in that Or adopt the skewed pole rotor described in any one of claims 1 to 5, 6-8, or adopt the production method of the skewed pole rotor described in any one of claims 9, 10, 11, 12.

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