Motor rotor punching sheet of electric motorcycle

Abstract

The utility model relates to the technical field of electric motorcycle motor manufacturing, in particular to an electric motorcycle motor rotor punching sheet, which comprises a punching sheet body, and the contour line of the punching sheet body between any two adjacent second symmetric lines comprises a first arc section, a second arc section and a third arc section which correspond to magnetic steel grooves. Wherein the first arc section intersects with the first symmetric line and is symmetric about the first symmetric line, and the first arc section is different from the second arc section. According to the motor rotor punching sheet of the electric motorcycle adopting the technical scheme, due to unequal arcs of the outer circle, the magnetic steel is uniformly distributed in a V shape, and an air gap between the rotor sheet and a stator is adjusted through the unequal arcs; and an air gap flux density mean value and a pole-arc coefficient in a space are corrected, so that a relatively high air gap flux density amplitude can be ensured while a potential waveform is corrected.

Description

Technical Field

[0001] This utility model relates to the field of electric motorcycle motor manufacturing technology, specifically to an electric motorcycle motor rotor lamination. Background Technology

[0002] Most existing electric motorcycles use permanent magnet motors, which have the characteristics of high torque density, low manufacturing cost, and wide high efficiency range, making them an essential component of electric motorcycles.

[0003] Currently, the rotor laminations used in electric motorcycle motors, such as... Figure 1 and Figure 2 As shown, this rotor lamination includes a lamination body 1, on which multiple magnetic slots 11 are constructed. The magnetic slots 11 have a first line of symmetry in the radial direction of the lamination body 1, and any two adjacent magnetic slots 11 are symmetrical about a second line of symmetry in the radial direction of the lamination body 1. The outer circle of the lamination body 1 is a complete circle, and the radius of the lamination body 1 is R. The magnets are evenly distributed in a V-shape, and the air gap between the rotor and the stator is equal. Due to the presence of slots in the structure of the permanent magnet synchronous motor, there are harmonic distortions in the armature reaction of the winding, which causes torque fluctuations in the permanent magnet synchronous motor during operation. The torque fluctuations of the motor are transmitted to the entire power system through the rotor shaft, generating some harmful vibrations and reducing the service life of components. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a rotor lamination for an electric motorcycle motor. By optimizing the outer contour cutting edge of the rotor lamination, the outer circle of the rotor lamination body has unequal arc. By adjusting the air gap between the rotor lamination and the stator through unequal arc, the average value of the air gap magnetic flux density and the pole arc coefficient in space are corrected. This achieves the correction of the potential waveform while ensuring a high air gap magnetic flux density amplitude. It can reduce cogging torque and torque fluctuation without increasing manufacturing difficulty or material cost.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0006] An electric motorcycle motor rotor lamination includes a lamination body with multiple magnetic slots. Each magnetic slot has a first line of symmetry in the radial direction of the lamination body. Any two adjacent magnetic slots are symmetrical about a second line of symmetry in the radial direction of the lamination body. The radius of the lamination body is R. The outline of the lamination body between any two adjacent second lines of symmetry includes a first arc segment, a second arc segment, and a third arc segment corresponding to the magnetic slots. The first arc segment intersects the first line of symmetry and is symmetrical about it. The first arc segment and the third arc segment are located on opposite sides of the first line of symmetry and are symmetrical about the first line of symmetry. One end of the first arc segment is connected to the second arc segment through a first transition segment, and the other end of the first arc segment is connected to the third arc segment through a second transition segment. The first transition segment and the second transition segment are symmetrical about the first line of symmetry. The arc center and arc radius of the second and third arc segments are the same as those of the lamination body. The arc center of the first arc segment is the intersection of its corresponding pitch circle and the first line of symmetry. The radius of the pitch circle is R1, R1 = 0.4706R - 0.4707R, and the center of the pitch circle is the same as the center of the lamination body. The radius of the first arc segment is R2, R2 = 0.5293R - 0.5294R.

[0007] Further defined, the first transition segment and the second transition segment are R3, where R3 = 0.1155R - 0.1156R.

[0008] Further defined, the arc of the first arc segment is δ1, 21°≤δ1≤23°, the arc of the second and third arc segments is δ2, 5°≤δ2≤7°, and the arc of the first transition segment and the second transition segment is δ3, 0.8°≤δ2≤1.1°.

[0009] Further specified, the number of magnetic slots is twenty, and the radius of the punch body is 51.5 mm.

[0010] Further specifying, δ1 = 22°, δ2 = 6°, δ3 = 1°; the magnetic steel groove is a V-shaped magnetic steel groove, and the included angle of the V-shaped magnetic steel groove is θ, 80°≤θ≤90°;

[0011] To further specify, θ = 85°.

[0012] The rotor lamellar structure of the permanent magnet synchronous motor for electric motorcycles using the above technical solution is mainly composed of silicon steel sheets and magnets. The main design components include: rivet holes, magnetic air gap, unequal outer arc, cooling holes, and mating holes with the motor shaft. This design structure has an unequal outer arc and the magnets are evenly distributed in a V-shape. By adjusting the air gap between the rotor lamellars and the stator through the unequal arc, the average value of the air gap magnetic flux density and the pole arc coefficient in space are corrected, thereby correcting the potential waveform while ensuring a high air gap magnetic flux density amplitude. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the rotor laminations of an existing electric motorcycle motor;

[0014] Figure 2 yes Figure 1 Enlarged schematic diagram of part A;

[0015] Figure 3 This is a schematic diagram of the rotor lamination of the electric motorcycle motor of this utility model;

[0016] Figure 4 yes Figure 2 Enlarged diagram of part B. Detailed Implementation

[0017] The present invention will be further described in detail below with reference to the accompanying drawings.

[0018] like Figure 3 , Figure 4As shown, an electric motorcycle motor rotor lamination includes a lamination body 1, on which a plurality of magnetic slots 11 are constructed. Each magnetic slot 11 has a first line of symmetry 10 in the radial direction of the lamination body 1. Any two adjacent magnetic slots 11 are symmetrical about a second line of symmetry 20 in the radial direction of the lamination body 1. The radius of the lamination body 1 is R. The outline of the lamination body 1 between any two adjacent second lines of symmetry includes a first arc segment 111, a second arc segment 112, and a third arc segment 113 corresponding to the magnetic slots 11. The first arc segment 111 intersects with and is symmetrical about the first line of symmetry 10. The second arc segment 112 intersects with and is symmetrical about the first line of symmetry 10. The third arc segment 113 is located on both sides of the first line of symmetry and is symmetrical about the first line of symmetry 10. One end of the first arc segment 111 is connected to the second arc segment 112 through a first transition segment 114, and the other end of the first arc segment 111 is connected to the third arc segment 113 through a second transition segment 115. The first transition segment 114 and the second transition segment 115 are symmetrical about the first line of symmetry. The arc center and arc radius of the second arc segment 112 and the third arc segment 113 are the same as those of the lamination body 1. The arc center of the first arc segment 111 is the intersection of its corresponding pitch circle 30 and the first line of symmetry 10, and the radius of the pitch circle 30 is R1. R1 = 0.4706R - 0.4707R, the center of the pitch circle 30 is the same as the center of the lamination body 1, the radius of the first arc segment 111 is R2, R2 = 0.5293R - 0.5294R; the first transition segment and the second transition segment are R3, R3 = 0.1155R - 0.1156R.

[0019] The first arc segment 111 has an arc of δ1, 21°≤δ1≤23°; the second arc segment 112 and the third arc segment 113 both have an arc of δ2, 5°≤δ2≤7°; the first transition segment 114 and the second transition segment both have an arc of δ3, 0.8°≤δ2≤1.1°; the magnetic groove is a V-shaped magnetic groove, and the included angle of the V-shaped magnetic groove is θ, 80°≤θ≤90°.

[0020] The commonly used electric motorcycle motor rotor lamination is optimized, with twenty magnet slots 11, the radius of the lamination body 1 is 51.5mm, δ1=22°, δ2=6°, δ3=1°, and θ=85°.

[0021] The rotor lamination structure of the permanent magnet synchronous motor for electric motorcycles using the above technical solution is mainly composed of silicon steel sheets and magnets. Its main design components include rivet holes, magnetic air gap, unequal outer arc, cooling holes, and mating holes with the motor shaft. By optimizing the outer contour cutting edge of the rotor lamination, the outer arc of the rotor lamination body is made unequal, and the magnets are evenly distributed in a V-shape. Adjusting the air gap between the rotor laminations and the stator through unequal arcs corrects the average air gap magnetic flux density and pole arc coefficient in space. This achieves the correction of the electromotive force waveform while ensuring a high air gap magnetic flux density amplitude. It reduces cogging torque and torque fluctuation without increasing manufacturing difficulty or material costs.

[0022] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

Claims

1. A rotor lamination for an electric motorcycle motor, comprising a lamination body, wherein a plurality of magnetic slots are formed on the lamination body, the magnetic slots having a first line of symmetry in the radial direction of the lamination body, any two adjacent magnetic slots being symmetrical about a second line of symmetry in the radial direction of the lamination body, the radius of the lamination body being R, characterized in that, The outline of the lamination body located between any two adjacent second symmetry lines includes a first arc segment, a second arc segment, and a third arc segment corresponding to the magnet slot. The first arc segment intersects the first symmetry line and is symmetrical about it. The second and third arc segments are located on opposite sides of the first symmetry line and are symmetrical about it. One end of the first arc segment is connected to the second arc segment via a first transition segment, and the other end of the first arc segment is connected to the third arc segment via a second transition segment. The first and second transition segments are symmetrical about the first symmetry line. The arc center and arc radius of the second and third arc segments are the same as those of the lamination body. The arc center of the first arc segment is the intersection of its corresponding pitch circle and the first symmetry line. The radius of the pitch circle is R1, R1 = 0.4706R - 0.4707R, and the center of the pitch circle is the same as the center of the lamination body. The radius of the first arc segment is R2, R2 = 0.5293R - 0.5294R.

2. The electric motorcycle motor rotor lamination according to claim 1, characterized in that, The first transition segment and the second transition segment are R3, where R3 = 0.1155R - 0.1156R.

3. The electric motorcycle motor rotor lamination according to claim 1, characterized in that, The first arc segment has an arc length of δ1, 21°≤δ1≤23°; the second and third arc segments both have an arc length of δ2, 5°≤δ2≤7°; and the first and second transition segments both have an arc length of δ3, 0.8°≤δ2≤1.1°.

4. The electric motorcycle motor rotor lamination according to claim 3, characterized in that, There are twenty magnetic slots, and the radius of the punch body is 51.5 mm.

5. The electric motorcycle motor rotor lamination according to claim 4, characterized in that, δ1=22°, δ2=6°, δ3=1°.

6. The electric motorcycle motor rotor lamination according to claim 4, characterized in that, The magnet groove is a V-shaped magnet groove, and the included angle of the V-shaped magnet groove is θ, where 80°≤θ≤90°.

7. The electric motorcycle motor rotor lamination according to claim 6, characterized in that, The value of θ is 85°.

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