Motor rotor structure and motor thereof

Abstract

The utility model relates to a motor rotor structure and a motor thereof, the motor rotor structure comprises a rotor steel sheet and a plurality of magnetic steels, the rotor steel sheet is provided with a plurality of installation projections, the installation projections are internally provided with installation channels, and the magnetic steels are located in the installation channels; the motor further comprises a first magnetic steel check ring and a second magnetic steel check ring, the first magnetic steel check ring and the second magnetic steel check ring are located on the two sides of the installation channel respectively, and the side faces of the magnetic steel make contact with the first magnetic steel check ring and the second magnetic steel check ring. Compared with the prior art, after the magnetic steel and the second magnetic steel check ring are sequentially mounted, the axial movement of the magnetic steel is positioned by the first magnetic steel check ring and the second magnetic steel check ring, the radial movement of the magnetic steel is positioned by the inner wall of the mounting channel, the magnetic steel can be mounted without glue, the magnetic steel is firmly mounted, and the service life of the magnetic steel is prolonged. The risk that the magnetic steel falls off is greatly reduced, the reliability of the rotor is ensured, the magnetic steel is not easy to damage, and the rotor steel sheet is not easy to deform.

Description

Technical Field

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

[0002] The motor rotor includes magnets, which are used to generate magnets and generate current. Magnets are key components of the motor and directly affect the performance and efficiency of the motor. In the prior art, magnets are usually installed in a surface-mounted manner, and the surface-mounted method mostly uses glue to directly stick the magnets on the surface of the rotor.

[0003] However, the use of surface-mounted methods to fix magnets will cause the following problems: 1. The motor will generate heat during operation, and the magnets will be glued to the rotor core with glue. The glue will age faster due to the heat of the motor, and the magnets may fall off, affecting the reliability of the rotor. 2. The glue needs a certain amount of time to solidify after being pasted, the production process is more complicated, and the quality is not easy to control. Utility Model Content

[0004] The utility model aims to provide a motor rotor structure and a motor thereof for positioning the radial movement of magnetic steel so as to make the magnetic steel more firmly installed, in view of the shortcomings of the prior art.

[0005] To achieve the purpose, the technical solution adopted by the utility model is:

[0006] The motor rotor structure comprises a rotor steel sheet and a plurality of magnetic steels. The rotor steel sheet is provided with a plurality of mounting protrusions, the mounting protrusions are provided with mounting channels, and the magnetic steels are located in the mounting channels.

[0007] As a further optimization of the above technical solution: it also includes a first magnetic steel retaining ring and a second magnetic steel retaining ring, the first magnetic steel retaining ring and the second magnetic steel retaining ring are respectively located on both sides of the installation channel, and the side surface of the magnetic steel is in contact with the first magnetic steel retaining ring and the second magnetic steel retaining ring.

[0008] As a further optimization of the above technical solution: two magnetic steels are arranged in each installation channel, and the magnetic steels are arc-shaped.

[0009] As a further optimization of the above technical solution: a separation groove is provided between two adjacent mounting protrusions.

[0010] As a further optimization of the above technical solution: it also includes a rotor bracket, the rotor steel sheet is sleeved on the rotor bracket, and the first magnetic steel retaining ring is integrally formed at the end of the outer peripheral surface of the rotor bracket.

[0011] As a further optimization of the above technical solution: the second magnetic steel retaining ring is sleeved on the outer circumferential surface of the rotor bracket, and a plurality of screws are provided on the second magnetic steel retaining ring, and the ends of the screws pass through the rotor steel sheets and are fixed to the rotor bracket.

[0012] The motor includes the motor rotor structure in the above technical solution, and also includes a stator, a motor driving shaft, a reduction mechanism, a motor output shaft, and a rim. The stator is wound with a coil, the rotor steel sheet is located in the stator, the motor driving shaft is penetrated and connected in the rotor bracket, the motor driving shaft is transmission-connected to the motor output shaft through the reduction mechanism, the motor output shaft is fixed to the rim, after power is turned on, the stator drives the rotor steel sheet and the rotor bracket to rotate, the rotor bracket drives the motor driving shaft to rotate, the motor driving shaft reduces power through the reduction mechanism and outputs it to the motor output shaft, so that the motor output shaft drives the rim to rotate.

[0013] As a further optimization of the above technical solution: the speed reduction mechanism is a planetary gear structure.

[0014] As a further optimization of the above technical solution: the inner circumference of the rotor bracket and the motor driving shaft are positioned and connected by a flat key, and the motor driving shaft is also provided with knurling, and the knurling is used for interference fit with the inner circumference of the rotor bracket.

[0015] Compared with the prior art, in the utility model, after the magnetic steel and the second magnetic steel retaining ring are installed in sequence, the axial movement of the magnetic steel is positioned by the first magnetic steel retaining ring and the second magnetic steel retaining ring, and the radial movement of the magnetic steel is positioned by the inner wall of the installation channel. The installation of the magnetic steel can be achieved without gluing, and the magnetic steel is firmly installed, which greatly reduces the risk of the magnetic steel falling off and ensures the reliability of the rotor. At the same time, the magnetic steel is not easy to be damaged and the rotor steel sheet is not easy to be deformed. Two magnetic steels are arranged in the installation channel, and the magnetic steel has a small width and a small curvature, which can make the utilization rate of square raw materials higher, greatly reduce the waste of raw materials, and save costs. The setting of the separation groove reduces the amount of magnetic steel used, reduces costs, and also makes the motor have a salient pole effect, so that the torque output by the motor increases the magnetic resistance torque, that is, it can output a larger torque under the condition of the same phase current, making the whole vehicle more powerful and the starting acceleration performance more superior. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the cross-sectional structure of a hub reduction motor.

[0017] Figure 2 It is a schematic diagram of the exploded structure of the rotor in a hub reduction motor. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with the accompanying drawings and specific implementations. Figure 1-2 As shown, a hub reduction motor includes a power source, a motor driving shaft 3, a reduction mechanism 4, a motor output shaft 5, and a rim 6. The motor driving shaft 3 is connected to the motor output shaft 5 through the reduction mechanism 4, and the rim 6 is fixed to the end of the motor output shaft 5. The power source drives the motor driving shaft 3 to rotate, and the motor driving shaft 3 reduces the power output to the motor output shaft 5 through the reduction mechanism 4, so that the motor output shaft 5 drives the rim 6 to rotate. The power source includes a stator 1 and a rotor 2, and the rotor 2 is located in the stator 1. The rotor 2 is sleeved on the motor driving shaft 3 and connected to the motor driving shaft 3. After power is turned on, the stator 1 drives the rotor 2 to rotate, and the rotor 2 drives the motor driving shaft 3 to rotate.

[0019] In the above technical solution: a coil is wound on the stator 1. The rotor 2 includes a rotor support 21, a rotor steel sheet 23 and a plurality of magnets 22. The rotor steel sheet 23 is sleeved on the rotor support 21. A plurality of mounting protrusions 24 are provided on the rotor steel sheet 23, and mounting channels 25 are formed in the mounting protrusions 24. A separation groove 26 is provided between two adjacent mounting protrusions 24. The magnets 22 are located in the mounting channels 25, and two magnets 22 are provided in each mounting channel 25. The magnets 22 are arc-shaped, and the width of the two magnets 22 in the mounting channel 25 is b. The reason why a whole arc-shaped magnetic steel is not directly set in the installation channel 25 is that: if an arc-shaped magnetic steel is set in the installation channel 25, the width of the arc-shaped magnetic steel is 2b, that is, the width of the arc-shaped magnetic steel is wider and the curvature is larger; at the same time, the arc-shaped magnetic steel is produced by cutting it from the square raw material through wire cutting. After cutting the arc-shaped magnetic steel, the remaining part of the square raw material that cannot be cut into a complete arc-shaped magnetic steel is wasted, and the wider the width of the arc-shaped magnetic steel and the larger the curvature, the lower the utilization rate of the square raw material, the more raw materials are wasted, the price of the magnetic steel raw materials is high, and the cost is wasted. Therefore, two magnetic steels 22 are set in the installation channel 25. The magnetic steels 22 have a small width and a small curvature, which can make the utilization rate of the square raw material higher, greatly reduce the waste of raw materials, and save costs.

[0020] The setting of the separation slot 26 makes the pole arc coefficient of the motor less than 1, reduces the amount of magnetic steel 22 used, and reduces costs. At the same time, the separation slot 26 also makes the cross-axis inductance of the motor greater than the direct-axis inductance, and the salient pole rate of the motor greater than 1, so that the motor has a salient pole effect. The salient pole effect increases the reluctance torque of the torque output by the motor, that is, it can output a larger torque under the same phase current, making the vehicle more powerful and the starting acceleration performance more superior. In addition, the salient pole effect can also enhance the weak magnetic speed-up effect, thereby obtaining a higher speed and a larger speed-up space, which can meet the driving requirements of electric vehicles, achieve a balance between cruising range and power, and improve the overall performance of the motor. That is, it is achieved by reducing the amount of magnetic steel 22 used while ensuring that the performance parameters of the motor remain unchanged, thereby greatly reducing costs.

[0021] In the above technical solution: a first magnetic steel retaining ring 28 is integrally formed at the end of the outer circumference of the rotor bracket 21, and the rotor steel sheet 23 is sleeved on the outer circumference of the rotor bracket 21, and the side of the rotor steel sheet 23 is in contact with the first magnetic steel retaining ring 28; then the magnetic steel 22 is installed in the installation channel 25, so that the magnetic steel 22 is in contact with the first magnetic steel retaining ring 28. A second magnetic steel retaining ring 27 is sleeved on the outer circumference of the rotor bracket 21, and a plurality of screws 29 are provided on the second magnetic steel retaining ring 27, and the ends of the screws 29 pass through the rotor steel sheet 23 and are fixed on the rotor bracket 21. After installation, the first magnetic steel retaining ring 28 and the second magnetic steel retaining ring 27 are respectively located on both sides of the installation channel 25, and the side of the magnetic steel 22 is in contact with the first magnetic steel retaining ring 28 and the second magnetic steel retaining ring 27. Therefore, when the magnetic steel 22 and the second magnetic steel retaining ring 27 are installed in sequence, the axial movement of the magnetic steel 22 is positioned by the first magnetic steel retaining ring 28 and the second magnetic steel retaining ring 27, and the radial movement of the magnetic steel 22 is positioned by the inner wall of the installation channel 25, and the installation of the magnetic steel 22 can be achieved without glue, and the magnetic steel 22 is firmly installed, which greatly reduces the risk of the magnetic steel falling off, and ensures the reliability of the rotor. At the same time, the magnetic steel 22 is not easy to be damaged, and the rotor steel sheet 23 is not easy to deform. The second magnetic steel retaining ring 27 can be used as a dynamic balancing plate, and can achieve the purpose of stable operation of the motor by changing the mass distribution of the rotor 2.

[0022] In the above technical solution: the rotor steel sheet 23 is located in the stator 1, and the motor driving shaft 3 is connected to the rotor bracket 21; the stator 1 drives the rotor steel sheet 23, the magnetic steel 22, and the rotor bracket 21 to rotate, and the rotor bracket 21 drives the motor driving shaft 3 to rotate. The inner circumference of the rotor bracket 21 and the motor driving shaft 3 are positioned and connected by a flat key. The motor driving shaft 3 is also knurled, and the knurling is used to have an interference fit with the inner circumference of the rotor bracket 21, and then the motor driving shaft 3 and the rotor bracket 21 are tightly fitted by a press.

[0023] In the above technical solution: the speed reduction mechanism 4 is specifically a planetary gear structure.

[0024] 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. The motor rotor structure is characterized by The invention comprises a rotor steel sheet (23) and a plurality of magnetic steels (22). The rotor steel sheet (23) is provided with a plurality of mounting protrusions (24). A mounting channel (25) is formed in the mounting protrusions (24). The magnetic steels (22) are located in the mounting channels (25).

2. The motor rotor structure according to claim 1, characterized in that It also includes a first magnetic steel retaining ring (28) and a second magnetic steel retaining ring (27), wherein the first magnetic steel retaining ring (28) and the second magnetic steel retaining ring (27) are respectively located on both sides of the installation channel (25), and the side surfaces of the magnetic steel (22) are in contact with the first magnetic steel retaining ring (28) and the second magnetic steel retaining ring (27).

3. The motor rotor structure according to claim 1, characterized in that Two magnetic steels (22) are arranged in each installation channel (25), and the magnetic steels (22) are arc-shaped.

4. The motor rotor structure according to claim 1, characterized in that A separation groove (26) is provided between two adjacent mounting protrusions (24).

5. The motor rotor structure according to claim 2, characterized in that It also comprises a rotor support (21), the rotor steel sheet (23) is sleeved on the rotor support (21), and the first magnetic steel retaining ring (28) is integrally formed at the end of the outer peripheral surface of the rotor support (21).

6. The motor rotor structure according to claim 5, characterized in that The second magnetic steel retaining ring (27) is sleeved on the outer circumferential surface of the rotor bracket (21), and a plurality of screws (29) are provided on the second magnetic steel retaining ring (27), and the ends of the screws (29) pass through the rotor steel sheets (23) and are fixed to the rotor bracket (21).

7. A motor, comprising a motor rotor structure as claimed in any one of claims 5 to 6, characterized in that The invention also comprises a stator (1), a motor driving shaft (3), a speed reducing mechanism (4), a motor output shaft (5), and a wheel rim (6); a coil is wound on the stator (1); the rotor steel sheet (23) is located in the stator (1); the motor driving shaft (3) is connected to the rotor bracket (21); the motor driving shaft (3) is transmission-connected to the motor output shaft (5) through the speed reducing mechanism (4); the motor output shaft (5) is fixed to the wheel rim (6); after power is turned on, the stator (1) drives the rotor steel sheet (23) and the rotor bracket (21) to rotate; the rotor bracket (21) drives the motor driving shaft (3) to rotate; the motor driving shaft (3) decelerates power and outputs it to the motor output shaft (5) through the speed reducing mechanism (4), so that the motor output shaft (5) drives the wheel rim (6) to rotate; The speed reduction mechanism (4) is a planetary gear structure.

8. The motor according to claim 7, characterized in that The inner circumferential surface of the rotor support (21) and the motor driving shaft (3) are positioned and connected via a flat key, and the motor driving shaft (3) is also provided with knurling, and the knurling is used to achieve an interference fit with the inner circumferential surface of the rotor support (21).

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