Electric vehicle motor rotor and motor thereof

Abstract

The utility model relates to an electric vehicle motor rotor and a motor thereof, comprising a rotor iron core which is a high-permeability powder metallurgy rotor iron core. The rotor core is provided with a plurality of magnetic steel grooves, and the magnetic steel grooves are internally provided with magnetic steel. The rotor core is located on the inner side or the outer side of the stator; when the rotor core is located on the inner side of the stator, the motor is an inner rotor motor; when the rotor iron core is located on the outer side of the stator, the motor is an outer rotor motor. Compared with the prior art, the rotor core is made of a high-permeability material which requires high permeability and low loss, so that the permeability of the rotor core is comparable with that of a silicon steel sheet; the rotor iron core is integrally formed through a powder metallurgy process, the manufacturing process is simple, splicing and blanking are not needed, the machining difficulty is low, the production cost is low, the strength of the rotor iron core is high, and the precision of the structure and the size of the rotor iron core is guaranteed. The rotor iron core powder metallurgy technology integrated forming production mode is wide in application range.

Description

Technical Field

[0001] The utility model relates to an electric vehicle motor rotor and a motor thereof, belonging to the technical field of electric vehicle motors. Background Art

[0002] Electric vehicles include electric bicycles, electric motorcycles, electric cars, etc. In existing electric vehicle motors, the motor rotor includes a rotor core and a magnet. The magnet and the rotor core are fixed in the following ways: the magnet is directly attached to the inner circumference of the rotor core; or the silicon steel sheet is punched out to form a magnet groove, and the magnet is set in the magnet groove. In the prior art, the rotor core is composed of stacked silicon steel sheets. The production of the rotor core is relatively troublesome, especially the punching process of the silicon steel sheet is difficult, the production cost will also be greatly increased, and the accuracy of the structure and size is difficult to grasp; there are also segmented rotor cores, but the segmented rotor core needs to punch out many rotor cores, the production cycle is long, and the assembly time and labor cost are increased, and the stability of the connection between the rotor core segments is difficult to ensure. Utility Model Content

[0003] The utility model aims to provide an electric vehicle motor rotor and a motor thereof with a simple manufacturing process in view of the shortcomings of the prior art.

[0004] To achieve the purpose, the technical solution adopted by the utility model is:

[0005] An electric vehicle motor rotor includes a rotor core, wherein the rotor core is a high magnetic permeability powder metallurgy rotor core, that is, the rotor core is integrally formed from high magnetic permeability material using a powder metallurgy process, and the high magnetic permeability material refers to a ferromagnetic material with a magnetic permeability of more than 100.

[0006] As a further optimization of the above technical solution: a plurality of magnetic steel slots are formed on the rotor core, and magnetic steels are installed in the magnetic steel slots.

[0007] As a further optimization of the above technical solution: the rotor core is located on the inner side of the stator or the outer side of the stator.

[0008] As a further optimization of the above technical solution: the rotor core is located on the outside of the stator, the rotor core is a magnetic ring, a plurality of magnetic isolation teeth are evenly arranged on the inner circumference of the magnetic ring, and a fifth magnetic steel slot for installing magnetic steel is formed between two adjacent magnetic isolation teeth.

[0009] As a further optimization of the above technical solution: the rotor core is located on the outside of the stator, the rotor core is a magnetic ring, a plurality of bosses are evenly arranged on the inner circumference of the magnetic ring, a sixth magnetic steel slot for installing magnetic steel is formed between two adjacent bosses, a plurality of magnetic steel poles are alternately arranged in the sixth magnetic steel slot, and the bosses are trapezoidal.

[0010] As a further optimization of the above technical solution: the boss is arranged in an arc shape on the side close to the center of the magnetic conductive ring.

[0011] As a further optimization of the above technical solution: the rotor core is located on the outside of the stator, the rotor core is a magnetic ring, and a plurality of third magnetic steel slot groups are evenly arranged on the magnetic ring, the third magnetic steel slot groups include two seventh magnetic steel slots arranged in a V-shape, and two third positioning steps are also provided in the seventh magnetic steel slot, the magnetic steel is located in the seventh magnetic steel slot, and the end of the magnetic steel is in contact with the third positioning step.

[0012] As a further optimization of the above technical solution: the rotor core is located on the outside of the stator, the rotor core is a magnetic ring, and a plurality of fourth magnetic steel slot groups are evenly arranged on the magnetic ring, the fourth magnetic steel slot group includes three eighth magnetic steel slots arranged in a triangle, and two fourth positioning steps are also provided in the eighth magnetic steel slot, the magnetic steel is located in the eighth magnetic steel slot, and the end of the magnetic steel is in contact with the fourth positioning step.

[0013] As a further optimization of the above technical solution: the rotor core is located on the outside of the stator, the rotor core is a magnetic ring, and a plurality of I-shaped ninth magnetic steel slots are evenly formed on the magnetic ring. Two fifth positioning steps are also provided in the ninth magnetic steel slot. The magnetic steel is located in the ninth magnetic steel slot, and the end of the magnetic steel is in contact with the fifth positioning step.

[0014] As a further optimization of the above technical solution: the rotor core is located on the inner side of the stator, and a plurality of first magnetic steel slot groups are evenly arranged on the rotor core, the first magnetic steel slot group includes two first magnetic steel slots arranged in a V shape, and two first positioning steps are also provided in the first magnetic steel slot, the magnetic steel is located in the first magnetic steel slot, and the end of the magnetic steel is in contact with the first positioning step, a first motor shaft hole is formed in the center of the rotor core, and two positioning protrusions are formed on the hole wall of the first motor shaft hole, one of the positioning protrusions is formed with a positioning notch, and a plurality of first weight reduction holes are also formed on the rotor core, and the plurality of first weight reduction holes are arranged around the first motor shaft hole.

[0015] As a further optimization of the above technical solution: the rotor core is located on the inner side of the stator, and a plurality of second magnetic steel slot groups are evenly arranged on the rotor core, the second magnetic steel slot group includes three second magnetic steel slots arranged in a triangle, and two second positioning steps are also provided in the second magnetic steel slot, the magnetic steel is located in the second magnetic steel slot, and the end of the magnetic steel is in contact with the second positioning step, a second motor shaft hole is formed in the center of the rotor core, and a plurality of second weight reduction holes are also formed on the rotor core, and the plurality of second weight reduction holes are arranged around the second motor shaft hole, and the second weight reduction holes are approximately triangle-shaped.

[0016] As a further optimization of the above technical solution: the rotor core is located on the inner side of the stator, a plurality of third magnetic steel slots for installing magnetic steel are evenly opened on the outer circumferential surface of the rotor core, a third motor shaft hole is formed at the center of the rotor core, and a plurality of third weight-reducing holes are also formed on the rotor core, and the plurality of third weight-reducing holes are arranged around the third motor shaft hole, and the third weight-reducing holes are arc-shaped.

[0017] As a further optimization of the above technical solution: the rotor core is located on the inner side of the stator, a plurality of fourth magnetic steel slots are evenly arranged on the rotor core, a fourth motor shaft hole is formed at the center of the rotor core, a plurality of arc-shaped fourth weight-reducing holes are also formed on the rotor core, a plurality of the fourth weight-reducing holes are arranged around the fourth motor shaft hole, and a plurality of the fourth magnetic steel slots are arranged around the fourth weight-reducing holes.

[0018] The motor comprises the electric vehicle motor rotor in the above technical solution. When the rotor core is located inside the stator, the motor is an inner rotor motor; when the rotor core is located outside the stator, the motor is an outer rotor motor.

[0019] Compared with the prior art, the rotor core in the utility model adopts high magnetic permeability material, which requires high magnetic permeability and low loss, so that the magnetic conductivity of the rotor core is comparable to that of silicon steel sheets; the rotor core is integrally formed by powder metallurgy process, the manufacturing process is simple, no assembly is required, no punching is required, the processing difficulty is low, the production cost is low, the strength of the rotor core is high, and the accuracy of the rotor core structure and size is guaranteed; the production method of integrally forming the rotor core by powder metallurgy process has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional structural schematic diagram of the first embodiment of the present utility model.

[0021] Figure 2 It is a three-dimensional structural schematic diagram of the second embodiment of the present utility model.

[0022] Figure 3 It is a three-dimensional structural schematic diagram of the third embodiment of the present utility model.

[0023] Figure 4 It is a three-dimensional structural schematic diagram of the fourth embodiment of the present utility model.

[0024] Figure 5 It is a three-dimensional structural schematic diagram of the fifth embodiment of the present utility model.

[0025] Figure 6 It is a three-dimensional structural schematic diagram of the sixth embodiment of the present utility model.

[0026] Figure 7 It is a three-dimensional structural schematic diagram of the seventh embodiment of the present utility model.

[0027] Figure 8 It is a three-dimensional structural schematic diagram of the eighth embodiment of the present utility model.

[0028] Fig. 9 It is a three-dimensional structural schematic diagram of the ninth embodiment of the present utility model.

[0029] Fig.10 It is a three-dimensional structural schematic diagram of the tenth embodiment of the present utility model. DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with the accompanying drawings and specific implementations. Figure 1-10 As shown, an electric vehicle motor rotor includes a rotor core 1, on which a plurality of magnetic steel slots are formed, and magnetic steels are installed in the magnetic steel slots. The rotor core 1 is a high magnetic permeability powder metallurgy integrated rotor core, that is, the rotor core 1 is formed in one piece from a high magnetic permeability material using a powder metallurgy process. High magnetic permeability material refers to a ferromagnetic material with a magnetic permeability of more than 100. Magnetic permeability is a physical quantity that characterizes the magnetic properties of a magnetic medium. It indicates the resistance to magnetic flux generated by a coil in space or in the space of a magnetic core after a current flows through it, or its ability to conduct magnetic lines of force in a magnetic field. The formula is μ=B / H, where H=magnetic field intensity and B=magnetic induction intensity. High magnetic permeability materials require high magnetic permeability and low loss. The rotor core 1 is made of high magnetic permeability material, so that its magnetic conductivity is comparable to that of silicon steel sheets; the rotor core 1 is integrally formed using a powder metallurgy process, with a simple manufacturing process, no assembly or punching required, low processing difficulty, low production cost, high strength of the rotor core 1, and also guaranteed accuracy in structure and size of the rotor core 1.

[0031] In the above technical solution: the rotor core 1 is located on the inner side of the stator or the outer side of the stator.

[0032] Embodiment 1: The rotor core 1 is located inside the stator, and a plurality of first magnetic steel slot groups are evenly arranged on the rotor core 1. The first magnetic steel slot groups include two first magnetic steel slots 2 arranged in a V shape. Figure 1As shown, two first positioning steps 21 are further provided in the first magnetic steel slot 2, the magnetic steel is located in the first magnetic steel slot 2, and the end of the magnetic steel is in contact with the first positioning step 21. A first motor shaft hole 22 is formed in the center of the rotor core 1, and two positioning protrusions 23 are formed on the hole wall of the first motor shaft hole 22, and a positioning notch 24 is formed on one of the positioning protrusions 23. A plurality of first weight-reducing holes 25 are also formed on the rotor core 1, and the plurality of first weight-reducing holes 25 are arranged around the first motor shaft hole 22.

[0033] Embodiment 2: The rotor core 1 is located inside the stator, and a plurality of second magnetic steel slot groups are evenly arranged on the rotor core 1, such as Figure 2 As shown, the second magnetic steel slot group includes three second magnetic steel slots 3 arranged in a triangular shape. Two second positioning steps 31 are also provided in the second magnetic steel slot 3. The magnetic steel is located in the second magnetic steel slot 3, and the end of the magnetic steel is in contact with the second positioning step 31. A second motor shaft hole 32 is formed in the center of the rotor core 1. A plurality of second weight-reducing holes 33 are also formed on the rotor core 1. The plurality of second weight-reducing holes 33 are arranged around the second motor shaft hole 32, and the second weight-reducing holes 33 are approximately triangular.

[0034] Embodiment 3: The rotor core 1 is located inside the stator, such as Figure 3 As shown, a plurality of third magnetic steel slots 4 for installing magnetic steel are evenly formed on the outer circumference of the rotor core 1. A third motor shaft hole 41 is formed in the center of the rotor core 1. A plurality of third weight-reducing holes 42 are also formed on the rotor core 1, and the plurality of third weight-reducing holes 42 are arranged around the third motor shaft hole 41, and the third weight-reducing holes 42 are arc-shaped.

[0035] Embodiment 4: The rotor core 1 is located inside the stator, such as Figure 4 As shown, a plurality of fourth magnetic steel slots 5 are evenly arranged on the rotor core 1. A fourth motor shaft hole 51 is formed at the center of the rotor core 1, and a plurality of arc-shaped fourth weight-reducing holes 52 are also formed on the rotor core 1. The plurality of fourth weight-reducing holes 52 are arranged around the fourth motor shaft hole 51, and the plurality of fourth magnetic steel slots 5 are arranged around the fourth weight-reducing holes 52.

[0036] Embodiment 5: The rotor core 1 is located outside the stator, and the rotor core 1 is a magnetic ring. Figure 5 As shown, a plurality of magnetic isolation teeth 6 are evenly arranged on the inner circumference of the magnetic conductive ring. A fifth magnetic steel slot 61 for installing magnetic steel is formed between two adjacent magnetic isolation teeth 6. The magnetic isolation teeth 6 can reduce the amount of magnetic steel used, reduce costs, and at the same time make the motor produce a salient pole effect.

[0037] Embodiment 6: The rotor core 1 is located outside the stator, and the rotor core 1 is a magnetic ring. Figure 6As shown, a plurality of bosses 7 are evenly arranged on the inner circumference of the magnetic conductive ring, a sixth magnetic steel slot 71 for installing magnetic steel is formed between two adjacent bosses 7, and a plurality of magnetic steel poles are alternately arranged in the sixth magnetic steel slot 71. The bosses 7 are trapezoidal.

[0038] Embodiment 7: Based on the embodiment 5, the side arc shape of the boss 7 close to the center of the magnetic ring is set, such as Figure 7 shown.

[0039] Embodiment 8: The rotor core 1 is located outside the stator. The rotor core 1 is a magnetic ring. A plurality of third magnetic steel slot groups are evenly arranged on the magnetic ring. The third magnetic steel slot group includes two seventh magnetic steel slots 8 arranged in a V shape. Figure 8 Two third positioning steps are also provided in the seventh magnetic steel slot 8, the magnetic steel is located in the seventh magnetic steel slot 8, and the end of the magnetic steel is in contact with the third positioning steps.

[0040] Embodiment 9: The rotor core 1 is located outside the stator. The rotor core 1 is a magnetic ring. A plurality of fourth magnetic steel slot groups are evenly arranged on the magnetic ring. The fourth magnetic steel slot group includes three eighth magnetic steel slots 9 arranged in a triangle. Fig. 9 Two fourth positioning steps are also provided in the eighth magnetic steel slot 9, the magnetic steel is located in the eighth magnetic steel slot 9, and the end of the magnetic steel is in contact with the fourth positioning steps.

[0041] Embodiment 10: The rotor core 1 is located outside the stator. The rotor core 1 is a magnetic ring. A plurality of ninth magnetic steel slots 10 are evenly formed on the magnetic ring. Fig.10 The ninth magnetic steel slot 10 is further provided with two fifth positioning steps 101 . The magnetic steel is located in the ninth magnetic steel slot 10 , and the ends of the magnetic steel are in contact with the fifth positioning steps 101 .

[0042] The motor comprises the motor rotor in the above technical solution. When the rotor core 1 is located inside the stator, the motor is an inner rotor motor; when the rotor core 1 is located outside the stator, the motor is an outer rotor motor.

[0043] The above embodiments only illustrate part of the structure of the rotor core 1. The actual production is not limited to the above embodiments. The rotor core 1 with other structures can also be integrally formed from high magnetic permeability materials using powder metallurgy technology. The regular annular magnetic ring in the prior art can also be integrally formed from high magnetic permeability materials using powder metallurgy technology. After the magnetic ring is formed, the magnetic steel is directly attached to the inner circumference of the magnetic ring.

[0044] The preferred specific embodiments of the present utility model are described in detail above. It should be understood that ordinary technicians in this field can make many modifications and changes based on the concept of the present utility model without creative work. Therefore, all technical solutions that can be obtained by technicians in this technical field based on the concept of the present utility model through logical analysis, reasoning or limited experiments on the basis of the existing technology should fall within the protection scope of the present utility model.

Claims

1. An electric vehicle motor rotor, comprising a rotor core (1), characterized in that The rotor core (1) is a high magnetic permeability powder metallurgy rotor core, that is, the rotor core (1) is formed in one piece from a high magnetic permeability material using a powder metallurgy process, and the high magnetic permeability material refers to a ferromagnetic material with a magnetic permeability of more than 100.

2. The electric vehicle motor rotor according to claim 1, characterized in that The rotor core (1) is provided with a plurality of magnetic steel slots, in which magnetic steels are installed.

3. An electric vehicle motor rotor according to claim 1 or 2, characterized in that The rotor core (1) is located on the inner side of the stator or on the outer side of the stator.

4. The electric vehicle motor rotor according to claim 3, characterized in that The rotor core (1) is located outside the stator. The rotor core (1) is a magnetic conductive ring. A plurality of magnetic isolation teeth (6) are evenly arranged on the inner circumference of the magnetic conductive ring. A fifth magnetic steel slot (61) for installing magnetic steel is formed between two adjacent magnetic isolation teeth (6).

5. The electric vehicle motor rotor according to claim 3, characterized in that The rotor core (1) is located outside the stator. The rotor core (1) is a magnetic conductive ring. A plurality of bosses (7) are evenly arranged on the inner circumference of the magnetic conductive ring. A sixth magnetic steel slot (71) for installing magnetic steel is formed between two adjacent bosses (7). A plurality of magnetic steel poles are alternately arranged in the sixth magnetic steel slot (71). The bosses (7) are trapezoidal.

6. The electric vehicle motor rotor according to claim 5, characterized in that The boss (7) is arranged in an arc shape on the side surface close to the center of the magnetic conductive ring.

7. The electric vehicle motor rotor according to claim 3, characterized in that The rotor core (1) is located outside the stator, the rotor core (1) is a magnetic conductive ring, and a plurality of third magnetic steel slot groups are evenly arranged on the magnetic conductive ring, the third magnetic steel slot groups include two seventh magnetic steel slots (8) arranged in a V-shape, and two third positioning steps are also arranged in the seventh magnetic steel slot (8), the magnetic steel is located in the seventh magnetic steel slot (8), and the end of the magnetic steel is in contact with the third positioning step.

8. The electric vehicle motor rotor according to claim 3, characterized in that The rotor core (1) is located outside the stator, the rotor core (1) is a magnetic conductive ring, and a plurality of fourth magnetic steel slot groups are evenly arranged on the magnetic conductive ring, the fourth magnetic steel slot group includes three eighth magnetic steel slots (9) arranged in a triangle, and two fourth positioning steps are also arranged in the eighth magnetic steel slot (9), the magnetic steel is located in the eighth magnetic steel slot (9), and the end of the magnetic steel is in contact with the fourth positioning step.

9. The electric vehicle motor rotor according to claim 3, characterized in that The rotor core (1) is located outside the stator. The rotor core (1) is a magnetic conductive ring. A plurality of I-shaped ninth magnetic steel slots (10) are evenly formed on the magnetic conductive ring. Two fifth positioning steps (101) are also provided in the ninth magnetic steel slot (10). The magnetic steel is located in the ninth magnetic steel slot (10), and the end of the magnetic steel is in contact with the fifth positioning step (101).

10. The electric vehicle motor rotor according to claim 3, characterized in that The rotor core (1) is located on the inner side of the stator. A plurality of first magnetic steel slot groups are evenly arranged on the rotor core (1). The first magnetic steel slot groups include two first magnetic steel slots (2) arranged in a V shape. Two first positioning steps (21) are also arranged in the first magnetic steel slots (2). The magnetic steel is located in the first magnetic steel slots (2), and the ends of the magnetic steel are in contact with the first positioning steps (21). A first motor shaft hole (22) is formed at the center of the rotor core (1). Two positioning protrusions (23) are formed on the hole wall of the first motor shaft hole (22), and one of the positioning protrusions (23) is formed with a positioning notch (24). The rotor core (1) is also formed with a plurality of first weight reduction holes (25), and the plurality of first weight reduction holes (25) are arranged around the first motor shaft hole (22).

11. The electric vehicle motor rotor according to claim 3, characterized in that The rotor core (1) is located on the inner side of the stator. A plurality of second magnetic steel slot groups are evenly arranged on the rotor core (1). The second magnetic steel slot groups include three second magnetic steel slots (3) arranged in a triangle. Two second positioning steps (31) are also arranged in the second magnetic steel slots (3). The magnetic steel is located in the second magnetic steel slots (3), and the ends of the magnetic steel are in contact with the second positioning steps (31). A second motor shaft hole (32) is formed at the center of the rotor core (1). A plurality of second weight-reducing holes (33) are also formed on the rotor core (1). The plurality of second weight-reducing holes (33) are arranged around the second motor shaft hole (32). The second weight-reducing holes (33) are approximately in the shape of a triangle.

12. The electric vehicle motor rotor according to claim 3, characterized in that The rotor core (1) is located on the inner side of the stator, and a plurality of third magnetic steel slots (4) for installing magnetic steel are evenly provided on the outer peripheral surface of the rotor core (1). A third motor shaft hole (41) is formed at the center of the rotor core (1), and a plurality of third weight-reducing holes (42) are also formed on the rotor core (1). The plurality of third weight-reducing holes (42) are arranged around the third motor shaft hole (41), and the third weight-reducing holes (42) are arc-shaped.

13. The electric vehicle motor rotor according to claim 3, characterized in that The rotor core (1) is located on the inner side of the stator, a plurality of fourth magnetic steel slots (5) are evenly arranged on the rotor core (1), a fourth motor shaft hole (51) is formed at the center of the rotor core (1), and a plurality of arc-shaped fourth weight-reducing holes (52) are also formed on the rotor core (1), a plurality of the fourth weight-reducing holes (52) are arranged around the fourth motor shaft hole (51), and a plurality of the fourth magnetic steel slots (5) are arranged around the fourth weight-reducing holes (52).

14. A motor, comprising the electric vehicle motor rotor according to any one of claims 3 to 13, characterized in that When the rotor core (1) is located on the inner side of the stator, the motor is an inner rotor motor; when the rotor core (1) is located on the outer side of the stator, the motor is an outer rotor motor.

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