Rotor, motor, automobile

Abstract

The present invention provides a rotor, a motor, and a car, wherein the rotor includes a rotor core, the rotor core has a plurality of magnetic poles arranged at intervals along its circumferential direction, and under the same magnetic pole, the rotor core has a first magnetic steel slot, a second magnetic steel slot, and a third magnetic steel slot, wherein the first magnetic steel slot is a first V-shaped structure symmetrical about the first radial line of the rotor core, the second magnetic steel slot and the third magnetic steel slot are symmetrical about the first radial line and form a second V-shaped structure, the first V-shaped structure and the second V-shaped structure are both facing the radial outside of the rotor core, the first magnetic steel slot is equipped with a first side magnetic steel and a second side magnetic steel symmetrical about the first radial line, the ends of the first side magnetic steel and the second side magnetic steel adjacent to each other are clamped to form a first air slot, and the ends of the second magnetic steel slot and the third magnetic steel slot adjacent to each other form a first magnetic isolation bridge. According to the present invention, the output torque of the motor is improved, and the torque pulsation and harmonic content are reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of motor design, and in particular relates to a rotor, a motor and a car. Background Art

[0002] As people pay more and more attention to environmental protection and efficient use of energy, the new four modernizations of automobiles have become an industry consensus, and the wave of automobile electrification is becoming more and more surging. As a key link in the energy conversion of new energy vehicles, drive motors have a great impact on new energy vehicles. Permanent magnet synchronous motors are widely used in the field of pure electric or hybrid new energy vehicles because of their advantages such as high torque density, high efficiency, good stability and high reliability.

[0003] When developing a permanent magnet synchronous motor, it is necessary to consider the motor output torque, as well as the NVH (Noise, Vibration, Harshness) problems caused by torque pulsation and harmonic content on the motor. In addition, the mechanical strength of the motor must also be considered to ensure the reliability and safety of the motor. Summary of the invention

[0004] Therefore, the present invention provides a rotor, a motor, and a vehicle, which can improve the output torque of the motor and reduce torque pulsation and harmonic content.

[0005] In order to solve the above problems, the present invention provides a rotor, including a rotor core, the rotor core having a plurality of magnetic poles arranged at intervals along its circumferential direction, and under the same magnetic pole, the rotor core having a first magnetic steel slot, a second magnetic steel slot, and a third magnetic steel slot, wherein the first magnetic steel slot is a first V-shaped structure symmetrical about the first radial line of the rotor core, the second magnetic steel slot and the third magnetic steel slot are symmetrical about the first radial line and form a second V-shaped structure, the first V-shaped structure and the second V-shaped structure are both facing the radial outside of the rotor core, the first magnetic steel slot is equipped with a first side magnetic steel and a second side magnetic steel symmetrical about the first radial line, the ends of the first side magnetic steel and the second side magnetic steel adjacent to each other are clamped to form a first air slot, and the ends of the second magnetic steel slot and the third magnetic steel slot adjacent to each other form a first magnetic isolation bridge.

[0006] In some embodiments, a second magnetic isolation bridge is formed between the radial outer end of one side of the first magnetic steel slot and the outer circumferential wall of the rotor core, and a third magnetic isolation bridge is formed between the radial outer end of the other side of the first magnetic steel slot and the outer circumferential wall of the rotor core, and the radial width of the second magnetic isolation bridge and / or the third magnetic isolation bridge is L, 1mm≤L≤1.1mm.

[0007] In some embodiments, the first magnetic steel slot has a first slot wall and a second slot wall located on the radially outer side of the rotor core and intersecting in a V shape, and also has a third slot wall and a fourth slot wall located on the radially inner side of the rotor core and intersecting in a V shape, and the intersection of the first slot wall and the second slot wall and / or the intersection of the third slot wall and the fourth slot wall are rounded.

[0008] In some embodiments, the first slot wall is arranged parallel to the third slot wall with a spacing of q therebetween. The first magnetic steel slot also has a fifth slot wall and a sixth slot wall. The fifth slot wall is located radially outside the third slot wall to position the radial inner end of the first side magnetic steel. The radial thickness of the first side magnetic steel is n, q=(0.64~0.66)*n.

[0009] In some embodiments, q=0.645*n; and / or, the radial thickness of the second-side magnetic steel is equal to the radial thickness of the first-side magnetic steel.

[0010] In some embodiments, the first magnetic steel slot also includes a seventh slot wall located radially outside the fifth slot wall, and an eighth slot wall located radially outside the sixth slot wall, and an angle formed between the seventh slot wall and the eighth slot wall is c, 30°≤c≤35°.

[0011] In some embodiments, c = 32°.

[0012] In some embodiments, the second magnetic steel slot is provided with a second magnetic steel, the third magnetic steel slot is provided with a third magnetic steel, and the radial thickness of the second magnetic steel is m, where n=m*0.425.

[0013] In some embodiments, 7.2 mm ≤ m ≤ 7.5 mm; and / or, the radial thickness of the third magnetic steel is equal to the radial thickness of the second magnetic steel.

[0014] In some embodiments, the first side magnetic steel has a first side surface close to the outer circle of the rotor, the second side magnetic steel has a second side surface close to the outer circle of the rotor, the first side surface and the second side surface are arranged opposite to each other to form a first V-shape, the second magnetic steel slot has a first inner slot wall, and the third magnetic steel slot has a second inner slot wall symmetrical to the first inner slot wall about the first radial line, an extension line of the first inner slot wall and an extension line of the first radial edge adjacent to the first magnetic isolation bridge form a first intersection, an extension line of the second inner slot wall and an extension line of the second radial edge adjacent to the first magnetic isolation bridge form a second intersection, a line connecting the first intersection and the second intersection is a first line, and a radial distance between the tip of the first V-shape and the midpoint of the first line is h, h=(m+n)*(2~2.5).

[0015] In some embodiments, h=(m+n)*2.25; and / or, the opening angle of the first V-shape is a, 110°≤a≤115°.

[0016] In some embodiments, the second V-shape has an opening angle b, b=a-(5°-8°); and / or a=112°.

[0017] In some embodiments, the connection between the first inner groove wall and the first magnetic isolation bridge is a first circular arc, the radius of the first circular arc is ri, the circumferential width of the first magnetic isolation bridge is w, and ri=(1.2-1.3)*w.

[0018] The present invention also provides a motor, comprising a motor rotor, wherein the motor rotor is the above-mentioned rotor.

[0019] The present invention also provides a car, comprising a drive motor, wherein the drive motor is the above-mentioned motor.

[0020] The present invention provides a rotor, a motor, and a vehicle, which can reduce the leakage flux at the first magnetic steel slot while ensuring that the torque pulsation and harmonic content are small, and at the same time increase the permanent magnet torque and the reluctance torque, thereby further improving the output torque of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of the axial projection structure of a rotor according to an embodiment of the present invention;

[0022] Figure 2 for Figure 1 A schematic diagram of the local structure under the middle magnetic pole, mainly showing the structure of each component;

[0023] Figure 3 for Figure 1 A schematic diagram of the local structure under the middle magnetic pole, mainly showing various related dimensions;

[0024] Figure 4 for Figure 1 A schematic diagram of the local structure under a central magnetic pole, mainly showing other related dimensions.

[0025] The reference numerals are:

[0026] 1. rotor core; 11. first magnetic steel slot; 111. first slot wall; 112. second slot wall; 113. third slot wall; 114. fourth slot wall; 115. fifth slot wall; 116. sixth slot wall; 117. seventh slot wall; 118. eighth slot wall; 12. second magnetic steel slot; 121. first inner slot wall; 13. third magnetic steel slot; 131. second inner slot wall; 21. first side magnetic steel; 22. second side magnetic steel; 23. second magnetic steel; 24. third magnetic steel; 31. first air slot; 41. first magnetic isolation bridge; 42. second magnetic isolation bridge; 43. third magnetic isolation bridge. DETAILED DESCRIPTION

[0027] See also Figures 1 to 4 As shown, according to an embodiment of the present invention, a rotor is provided, including a rotor core 1, the rotor core 1 having a plurality of magnetic poles spaced along its circumferential direction, and under the same magnetic pole, the rotor core 1 having a first magnetic steel slot 11, a second magnetic steel slot 12, and a third magnetic steel slot 13, wherein the first magnetic steel slot 11 is a first V-shaped structure symmetrical about the first radial line of the rotor core 1, the second magnetic steel slot 12 and the third magnetic steel slot 13 are symmetrical about the first radial line and form a second V-shaped structure, the first V-shaped structure and the second V-shaped structure are both facing the radial outside of the rotor core 1, the first magnetic steel slot 11 is provided with a first side magnetic steel 21 and a second side magnetic steel 22 symmetrical about the first radial line, the ends of the first side magnetic steel 21 and the second side magnetic steel 22 adjacent to each other are clamped to form a first air slot 31, and the ends of the second magnetic steel slot 12 and the third magnetic steel slot 13 adjacent to each other form a first magnetic isolation bridge 41. In this technical solution, the first magnetic steel slot 11 serves as an outer ring V-shaped magnetic steel slot, and the second magnetic steel slot 12 and the third magnetic steel slot 13 serve together as an inner ring V-shaped magnetic steel slot, wherein the outer ring V-shaped magnetic steel slot forms the first air slot 31 at the first radial line, and the inner ring V-shaped magnetic steel slot corresponding to the first air slot 31 is provided with the first magnetic isolation bridge 41. Compared with the technical solution in the related technology of providing a magnetic isolation bridge for the outer ring V-shaped magnetic steel slot and an air slot for the inner ring V-shaped magnetic steel slot, the technical solution of the present invention can reduce the leakage flux at the first magnetic steel slot 11 while ensuring that the torque pulsation and harmonic content are small, while increasing the permanent magnet torque and the reluctance torque, thereby further improving the output torque of the motor. Specifically, as shown in the following table, it is verified that the output torque of the outer ring V-shaped magnetic steel slot with air slot is larger, while the torque pulsation and harmonic content are similar. Specifically, keeping other parameters consistent, the maximum output torques with air slot (the present invention) and with magnetic isolation bridge (related technology) are 1834.2 and 1806.6 respectively, the torque pulsation are 2.3% and 2.28% respectively, and the harmonic content is 1.12% and 1.13% respectively.

[0028]

[0029] The inner V-shaped magnetic steel groove has the first magnetic isolation bridge 41 located on the inner side of the first air groove 31, which can ensure the structural strength of the rotor core 1 while ensuring low magnetic leakage, and effectively prevent the rotor core 1 from being damaged when rotating at high speed.

[0030] In some embodiments, a second magnetic isolation bridge 42 is formed between the radial outer end of one side of the first magnetic steel slot 11 and the outer circumferential wall of the rotor core 1, and a third magnetic isolation bridge 43 is formed between the radial outer end of the other side of the first magnetic steel slot 11 and the outer circumferential wall of the rotor core 1. The radial width of the second magnetic isolation bridge 42 and / or the third magnetic isolation bridge 43 is L, 1mm≤L≤1.1mm. The width of the second magnetic isolation bridge 42 and the third magnetic isolation bridge 43 can reduce magnetic leakage, increase the permanent magnet torque of the motor, and improve the output capacity of the motor while ensuring the mechanical strength of the rotor.

[0031] In some embodiments, the first magnetic steel slot 11 has a first slot wall 111 and a second slot wall 112 located on the radially outer side of the rotor core 1 and intersecting in a V shape, and also has a third slot wall 113 and a fourth slot wall 114 located on the radially inner side of the rotor core 1 and intersecting in a V shape. The intersection of the first slot wall 111 and the second slot wall 112 and / or the intersection of the third slot wall 113 and the fourth slot wall 114 are rounded, that is, the intersection of the first slot wall 111 and the second slot wall 112 and the intersection of the third slot wall 113 and the fourth slot wall 114 respectively have arcs instead of straight edges, which can reduce stress concentration and improve the mechanical strength of the rotor core.

[0032] In some embodiments, the first slot wall 111 is arranged parallel to the third slot wall 113 and the distance therebetween is q. The first magnetic steel slot 11 also has a fifth slot wall 115 and a sixth slot wall 116. The fifth slot wall 115 is located radially outside the third slot wall 113 to position the radial inner end of the first side magnetic steel 21. The radial thickness of the first side magnetic steel 21 is n, q=(0.64~0.66)*n; the radial thickness of the second side magnetic steel 22 is equal to the radial thickness of the first side magnetic steel 21. Specifically, the sixth slot wall 116 is located radially outside the fourth slot wall 114 to position the radial inner end of the second side magnetic steel 22. The radial thickness of the second side magnetic steel 22 is n, q=0.64~0.66*n, and the best is q=0.645*n. The purpose of constraining the aforementioned q is to make q have an appropriate relatively large value under the premise of ensuring that the first side magnetic steel 21 and the second side magnetic steel 22 can be fixed, so as to prevent the q value from being too small, which will cause the air gap at the corresponding position to become smaller, thereby increasing the leakage flux in the middle part of the first magnetic steel slot (that is, the first air slot 31) and reducing the output capacity of the motor.

[0033] In some embodiments, the first magnetic steel slot 11 further includes a seventh slot wall 117 located radially outside the fifth slot wall 115, and an eighth slot wall 118 located radially outside the sixth slot wall 116. The angle formed between the seventh slot wall 117 and the eighth slot wall 118 is c, 30°≤c≤35°, that is, the V-shaped outer angle of the first magnetic steel slot 11 is c, preferably, c=32°. The increase of the angle c will cause the spacing between the circumferential ends of the first magnetic steel slot 11 and the adjacent second magnetic steel slot 12 or third magnetic steel slot 13 to become smaller, thereby increasing the magnetic flux density in the adjacent area, increasing the magnetic resistance, and uneven magnetic flux density, resulting in a decrease in output torque, an increase in torque pulsation, and an increase in harmonic content. If the angle c is too small, the circumferential width of the second magnetic isolation bridge 42 and the third magnetic isolation bridge 43 will be too small, resulting in an increase in leakage flux.

[0034] In some embodiments, the second magnetic steel slot 12 is provided with a second magnetic steel 23, the third magnetic steel slot 13 is provided with a third magnetic steel 24, and the radial thickness of the second magnetic steel 23 is m, n=

[0035] m*0.425. In a specific embodiment, 7.2mm≤m≤7.5mm, and the best is m=7.3mm. In this technical solution, by limiting the size relationship between m and n, it is possible to reduce torque pulsation and harmonic content while ensuring output torque. In some embodiments, the radial thickness of the third magnetic steel 24 is equal to the radial thickness of the second magnetic steel 23.

[0036] In some embodiments, the first side magnetic steel 21 has a first side surface close to the outer circle of the rotor, the second side magnetic steel 22 has a second side surface close to the outer circle of the rotor, the first side surface and the second side surface are arranged opposite to each other to form a first V-shape, the second magnetic steel slot 12 has a first inner slot wall 121, and the third magnetic steel slot 13 has a second inner slot wall 131 symmetrical to the first inner slot wall 121 about the first radial line, the extension line of the first inner slot wall 121 and the extension line of the first radial edge adjacent to the first magnetic isolation bridge 41 form a first intersection, the extension line of the second inner slot wall 131 and the extension line of the second radial edge adjacent to the first magnetic isolation bridge 41 form a second intersection, the line connecting the first intersection and the second intersection is a first line, the radial distance between the sharp corner of the first V-shape and the midpoint of the first line is h, h = (m + n) * (2 ~ 2.5), the best, h = (m + n) * 2.25, so that the output torque of the motor can be further improved by optimizing h, for details, see Figure 4 As shown, the sharp angle of the first V-shape is K, the midpoint of the first connecting line is J, the distance between J and K is h, and the minimum radial distance between point J and the hole wall of the shaft hole of the rotor core is O2. Under the premise that the minimum radial distance between point K and the hole wall of the shaft hole remains unchanged (that is, it is a constant), the larger the value of O2, the smaller the value of h will be. The inventors have studied the influence of the value of O2 on the output torque of the motor (as shown in the table below), and concluded that, as the value of O2 increases, h decreases and the output torque of the motor will gradually increase. However, at the same time, if h is too small, it will affect the distribution and shape of other structures (the first magnetic isolation bridge 41, the second magnetic steel slot 12, and the third magnetic steel slot 13). It is optimal to select the aforementioned range after comprehensive consideration.

[0037]

[0038] In some embodiments, the first V-shaped opening angle is a, 110°≤a≤115°, preferably, a=112°, and the second V-shaped opening angle is b, b=a-(5°~8°). The opening angles a and b can increase the output torque of the motor, reduce the torque pulsation of the motor, reduce the harmonic content of the motor, reduce the vibration of the motor, reduce the noise of the motor, and improve the performance of the motor.

[0039] In some embodiments, the connection between the first inner groove wall 121 and the first magnetic isolation bridge 41 is a first circular arc, the radius of the first circular arc is ri, the circumferential width of the first magnetic isolation bridge 41 is w, ri = (1.2 ~ 1.3) * w, in some embodiments, ri = 1.25 * w. The first inner groove wall and the first magnetic isolation bridge 41 are connected with the first circular arc, and the radius of the first circular arc is associated with the circumferential width of the first magnetic isolation bridge 41, so as to increase the mechanical strength of the first magnetic isolation bridge 41. It should be noted that the units of the above angles a, b, c are all in degrees, and the units of the above lengths are all in mm.

[0040] The present invention provides a rotor topology with low harmonics and low torque pulsation through the magnetic steel slot design, magnetic isolation bridge design and rotor pole design of the motor rotor, and provides constraints on the key dimensions of the rotor topology structure. This topology structure can reduce the harmonic content and torque pulsation of the motor, thereby reducing rotor losses, increasing the output torque of the motor, and improving the motor efficiency overall.

[0041] According to an embodiment of the present invention, there is further provided a motor, comprising a motor rotor, wherein the motor rotor is the above-mentioned rotor.

[0042] According to an embodiment of the present invention, there is also provided an automobile, comprising a drive motor, wherein the drive motor is the above-mentioned motor.

[0043] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0044] 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 rotor, comprising a rotor core (1), wherein the rotor core (1) has a plurality of magnetic poles arranged at intervals along its circumference, characterized in that: Under the same magnetic pole, the rotor core (1) has a first magnetic steel slot (11), a second magnetic steel slot (12), and a third magnetic steel slot (13), wherein the first magnetic steel slot (11) is a first V-shaped structure symmetrical about a first radial line of the rotor core (1), the second magnetic steel slot (12) and the third magnetic steel slot (13) are symmetrical about the first radial line and form a second V-shaped structure, the first V-shaped structure and the second V-shaped structure are both oriented toward the radial outside of the rotor core (1), and the first magnetic steel slot (11) is a first V-shaped structure symmetrical about a first radial line of the rotor core (1). A first side magnetic steel (21) and a second side magnetic steel (22) symmetrically arranged about the first radial line are installed in the slot (11); the ends of the first side magnetic steel (21) and the second side magnetic steel (22) adjacent to each other are clamped to form a first air slot (31); the ends of the second magnetic steel slot (12) and the third magnetic steel slot (13) adjacent to each other form a first magnetic isolation bridge (41); the second magnetic steel slot (12) and the third magnetic steel slot (13) are located on one side of the first magnetic steel slot (11) close to the center of the rotor core (1).

2. The rotor according to claim 1, characterized in that A second magnetic isolation bridge (42) is formed between the radial outer end of one side of the first magnetic steel slot (11) and the outer circumferential wall of the rotor core (1), and a third magnetic isolation bridge (43) is formed between the radial outer end of the other side of the first magnetic steel slot (11) and the outer circumferential wall of the rotor core (1), and the radial width of the second magnetic isolation bridge (42) and / or the third magnetic isolation bridge (43) is L, 1mm≤L≤1.1mm.

3. The rotor according to claim 1, characterized in that The first magnetic steel slot (11) comprises a first slot wall (111) and a second slot wall (112) which are located radially outside the rotor core (1) and intersect in a V shape, and further comprises a third slot wall (113) and a fourth slot wall (114) which are located radially inside the rotor core (1) and intersect in a V shape, and the intersection of the first slot wall (111) and the second slot wall (112) and / or the intersection of the third slot wall (113) and the fourth slot wall (114) are rounded.

4. The rotor according to claim 3, characterized in that The first slot wall (111) is arranged in parallel with the third slot wall (113) and the distance between the two is q. The first magnetic steel slot (11) also has a fifth slot wall (115) and a sixth slot wall (116). The fifth slot wall (115) is located radially outside the third slot wall (113) to position the radial inner end of the first side magnetic steel (21). The radial thickness of the first side magnetic steel (21) is n, and q=(0.64-0.66)*n.

5. The rotor according to claim 4, characterized in that q=0.645*n; and / or, the radial thickness of the second side magnetic steel (22) is equal to the radial thickness of the first side magnetic steel (21).

6. The rotor according to claim 4, characterized in that The first magnetic steel slot (11) further comprises a seventh slot wall (117) located radially outward of the fifth slot wall (115), and an eighth slot wall (118) located radially outward of the sixth slot wall (116), wherein an angle c is formed between the seventh slot wall (117) and the eighth slot wall (118), and 30°≤c≤35°.

7. The rotor according to claim 6, characterized in that c＝32°。 8. The rotor according to claim 4, characterized in that The second magnetic steel slot (12) is provided with a second magnetic steel (23), the third magnetic steel slot (13) is provided with a third magnetic steel (24), and the radial thickness of the second magnetic steel (23) is m, where n=m*0.

425.

9. The rotor according to claim 8, characterized in that 7.2mm≤m≤7.5mm; and / or, the radial thickness of the third magnetic steel (24) is equal to the radial thickness of the second magnetic steel (23).

10. The rotor according to claim 8, characterized in that The first side magnetic steel (21) has a first side surface close to the outer circle of the rotor, the second side magnetic steel (22) has a second side surface close to the outer circle of the rotor, the first side surface and the second side surface are arranged opposite to each other to form a first V-shape, the second magnetic steel slot (12) has a first inner slot wall (121), the third magnetic steel slot (13) has a second inner slot wall (131) symmetrical with the first inner slot wall (121) about the first radial line, the extension line of the first inner slot wall (121) and the extension line of the first radial edge adjacent to the first magnetic isolation bridge (41) form a first intersection, the extension line of the second inner slot wall (131) and the extension line of the second radial edge adjacent to the first magnetic isolation bridge (41) form a second intersection, the line connecting the first intersection and the second intersection is a first line, the radial distance between the sharp corner of the first V-shape and the midpoint of the first line is h, h=(m+n)*(2~2.5).

11. The rotor according to claim 10, characterized in that h=(m+n)*2.25; and / or, the opening angle of the first V-shape is a, 110°≤a≤115°.

12. The rotor according to claim 11, characterized in that The opening angle of the second V-shape is b, b=a-(5°-8°); and / or, a=112°.

13. The rotor according to claim 10, characterized in that The connection point between the first inner groove wall (121) and the first magnetic isolation bridge (41) is a first circular arc, the radius of the first circular arc is ri, the circumferential width of the first magnetic isolation bridge (41) is w, and ri=(1.2-1.3)*w.

14. A motor, comprising a motor rotor, characterized in that: The motor rotor is the rotor according to any one of claims 1 to 13.

15. A car, comprising a drive motor, characterized in that: The driving motor is the motor according to claim 14.

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