Magnetic coupling hub gear motor

Abstract

The utility model relates to a magnetic coupling hub gear motor, which comprises a motor shaft, a stator, a rotor, a speed reducing mechanism, a rim and a magnetic coupler, the stator, the rotor, the speed reducing mechanism and the rim are all sleeved on the motor shaft, a first end cover is arranged on the side surface of the rim, and a second end cover is arranged on the side surface of the rim. The rotor and the first end cover are in transmission through the magnetic coupler, and the rotor and the first end cover are both connected with the speed reducing mechanism. According to the utility model, the magnetic coupling motor and the gear motor are combined, and the automatic switching of the two motors is realized by utilizing the characteristic that the magnetic coupling motor slides automatically when being overloaded, the motor operates at a high rotating speed under the state of the magnetic coupling motor, and the motor outputs large torque under the state of the gear motor, so that the power density and the output torque of the hub motor are improved, and the rotating speed of the motor is higher; and the power density is high, so that the motor can increase the mileage and has large torque output.

Description

Technical Field

[0001] This utility model relates to a magnetically coupled hub geared motor, belonging to the field of hub motor technology. Background Technology

[0002] Electric vehicles include electric bicycles, electric motorcycles, and electric cars. As a means of transportation, electric vehicles are vulnerable to damage in poor road conditions. Insufficient power can affect their normal operation. For example, if the hub motor directly drives the wheel hub, the motor's torque cannot be amplified. Under heavy loads or on steep inclines, insufficient power can easily lead to insufficient power, forcing the rider to dismount and push the vehicle. Conversely, if the hub motor's peak torque is high enough to meet the vehicle's climbing and acceleration requirements, the actual operating conditions of the electric vehicle will mostly be in the low torque range, resulting in low torque load rate and low efficiency, which affects the electric vehicle's driving range. In other words, there is a trade-off between power and economy. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing a magnetically coupled hub geared motor that combines a magnetically coupled motor with a geared motor.

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

[0005] A magnetically coupled hub geared motor includes a motor shaft, a stator, a rotor, a reduction mechanism, a wheel rim, and a magnetic coupler. The stator, the rotor, the reduction mechanism, and the wheel rim are all mounted on the motor shaft. A first end cover is provided on the side of the wheel rim. The rotor and the first end cover are driven by the magnetic coupler. The rotor and the first end cover are both connected to the reduction mechanism.

[0006] As a further optimization of the above technical solution: the rotor includes a rotor support, the inner circumferential surface of the rotor support is sleeved on the motor shaft through a first bearing, the magnetic coupler includes a plurality of first magnets and a plurality of second magnets, the first magnets are located on the side of the rotor support, the second magnets are located on the inner circumferential surface of the first end cover, the first magnets and the second magnets are arranged opposite to each other and can attract each other; after the coil on the stator is energized, the rotor starts to rotate, and the rotor drives the first end cover to rotate synchronously through the magnetic coupler.

[0007] As a further optimization of the above technical solution: the reduction mechanism includes a gear ring, a sun gear, a planet carrier, and several planet gears. The sun gear is fixed on the rotor support, and the planet gears mesh with the sun gear and simultaneously mesh with the inner circumferential surface of the gear ring. The gear ring is fixed to the first end cover. The planet carrier is sleeved and fixed on the motor shaft, and the planet gears are hinged to the planet carrier. The rotor support drives the sun gear to rotate, and the sun gear drives the planet gears to rotate. The planet gears rotate on their own while driving the gear ring to rotate, thereby causing the first end cover and the rim to start rotating. When the torque of the rim and the first end cover is greater than the attraction force of the magnetic coupler, the magnetic coupler automatically slips, and the rotor drives the first end cover to rotate through the reduction mechanism.

[0008] As a further optimization of the above technical solution: the side of the rotor support is a mounting part, the middle part of the mounting part is recessed into the rotor support to form a relief part, the first magnet is located on the mounting part, and the relief part is provided with reinforcing ribs.

[0009] As a further optimization of the above technical solution: the stator includes a stator bracket, stator steel sheets and coils wound on the stator steel sheets, the stator steel sheets are sleeved and fixed on the stator bracket, the stator bracket is sleeved and fixed on the motor shaft, the stator bracket is provided with a clearance groove, and the clearance part is located in the clearance groove.

[0010] As a further optimization of the above technical solution: the rotor is sleeved on the stator, the rotor includes a magnetic ring and a plurality of magnets located on the inner circumferential surface of the magnetic ring, and the magnetic ring is fixed to the inner circumferential surface of the rotor support.

[0011] As a further optimization of the above technical solution: the rim is integrally formed with the first end cap.

[0012] Compared with existing technologies, this utility model combines a magnetic coupling motor and a geared motor, and utilizes the automatic slippage characteristic of the magnetic coupling motor under overload to achieve automatic switching between the two. In the magnetic coupling motor mode, the motor operates at high speed, while in the geared motor mode, the motor outputs high torque, improving the power density and output torque of the hub motor. This results in higher motor speed and greater power density, thus increasing both mileage and torque output. Simultaneously, it retains the inherent advantages of a magnetic coupling motor, including power transmission via a magnetic field, no mechanical contact between the rotor and the first end cover (avoiding mechanical wear and extending service life), high energy transfer efficiency (reducing energy loss), reduced vibration and noise due to the absence of mechanical contact (resulting in smoother operation), and the clearance portion located within the clearance slot (reducing the space occupied by the stator and rotor, compressing the axial space of the motor, and decreasing its overall size). Attached Figure Description

[0013] Figure 1 This is a cross-sectional structural diagram of the present invention.

[0014] Figure 2 This is an exploded structural diagram of the present invention. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. For example... Figure 1-2 As shown, a magnetically coupled hub geared motor includes a motor shaft 1, a stator 2, a rotor 3, a reduction mechanism 4, a wheel rim 5, and a magnetic coupler 6. The stator 2, rotor 3, reduction mechanism 4, and wheel rim 5 are all mounted on the motor shaft 1. A first end cover 51 is provided on the side of the wheel rim 5. The rotor 3 and the first end cover 51 are driven by the magnetic coupler 6. Both the rotor 3 and the first end cover 51 are connected to the reduction mechanism 4. When the coil on the stator 2 is energized, the rotor 3 begins to rotate. The rotor 3 drives the first end cover 51 to rotate synchronously through the magnetic coupler 6, which is the state of a magnetically coupled motor. When the torque of the wheel rim 5 and the first end cover 51 is greater than the attraction force of the magnetic coupler 6, the magnetic coupler 6 automatically slips. At this time, the rotor 3 drives the first end cover 51 to rotate through the reduction mechanism 4, which is the state of a geared motor. The rotor 3 operates at high speed, while the first end cover 51 and the wheel rim 5 operate at low speed, allowing the wheel rim 5 to output a large torque. This invention combines a magnetic coupling motor and a geared motor, utilizing the automatic slippage characteristic of the magnetic coupling motor under overload to achieve automatic switching between the two modes. In magnetic coupling motor mode, the motor operates at high speed, while in geared motor mode, it outputs high torque, thus increasing both mileage and torque output. Furthermore, the advantages of the magnetic coupling motor include: power transmission via a magnetic field, with no mechanical contact between the rotor 3 and the first end cover 51, avoiding mechanical wear and extending service life; high energy transfer efficiency, reducing energy loss; and reduced vibration and noise due to the absence of mechanical contact, resulting in smoother operation.

[0016] In the above technical solution: the rotor 3 includes a rotor support 31, and the inner circumferential surface of the rotor support 31 is sleeved on the motor shaft 1 through a first bearing. The magnetic coupler 6 includes a plurality of first magnets 61 and a plurality of second magnets 62. The first magnets 61 are located on the side of the rotor support 31, and the second magnets 62 are located on the inner circumferential surface of the first end cover 51. The first magnets 61 and the second magnets 62 are arranged opposite to each other and can attract each other.

[0017] In the above technical solution: the reduction mechanism 4 is specifically a planetary gear structure, including a gear ring 43, a sun gear 41, a planet carrier 44, and several planet gears 42. The sun gear 41 is fixed on the rotor support 31, and the planet gears 42 mesh with the sun gear 41. At the same time, the planet gears 42 mesh with the inner circumferential surface of the gear ring 43, and the gear ring 43 is fixed to the first end cover 51. The planet carrier 44 is sleeved and fixed on the motor shaft 1, and the planet gears 42 are hinged to the planet carrier 44. The rotor support 31 drives the sun gear 41 to rotate, the sun gear 41 drives the planet gears 42 to rotate, and the planet gears 42 rotate while driving the gear ring 43 to rotate, thereby causing the first end cover 51 to start rotating. When the torque of the first end cover 51 is greater than the attraction force of the magnetic coupler 6, the first end cover 51 operates at a low speed, while the rotor 3 operates at a high speed. The rotor drives the first end cover 51 to rotate through the reduction mechanism 4, thereby realizing the reduction transmission between the rotor 3 and the first end cover 51. At this time, it is in geared motor mode, which enables the motor to output a large torque, improves the power density and output torque of the hub motor, and makes the motor speed higher and the power density greater.

[0018] In the above technical solution: the side of the rotor support 31 is a mounting part 311, and the middle part of the mounting part 311 is recessed into the rotor support 31 to form a relief part 312, on which the first magnet 61 is located. The relief part 312 is provided with a reinforcing rib 313 to ensure the strength of the rotor support 31.

[0019] In the above technical solution: the stator 2 includes a stator bracket 21, stator steel sheets 22, and coils wound on the stator steel sheets 22. The stator steel sheets 22 are sleeved and fixed on the stator bracket 21, and the stator bracket 21 is sleeved and fixed on the motor shaft 1. The stator bracket 21 is provided with a relief groove, and the relief part 312 is located in the relief groove, reducing the space occupied by the stator 2 and the rotor 3, compressing the axial space of the motor, and reducing the size of the motor.

[0020] In the above technical solution: the rotor 3 is mounted on the stator 2, and the rotor 3 includes a magnetic ring 32 and a plurality of magnets 33 located on the inner circumferential surface of the magnetic ring 32. The magnetic ring 32 is fixed on the inner circumferential surface of the rotor support 31.

[0021] In the above technical solution: the rim 5 and the first end cap 51 are integrally formed.

[0022] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should fall within the protection scope of this utility model.

Claims

1. A magnetically coupled hub reduction motor characterized by The application relates to a motor, which comprises a motor shaft (1), a stator (2), a rotor (3), a speed reduction mechanism (4), a wheel rim (5) and a magnetic coupling (6), the stator (2), the rotor (3), the speed reduction mechanism (4) and the wheel rim (5) are all sleeved on the motor shaft (1), the side surface of the wheel rim (5) is provided with a first end cover (51), the rotor (3) and the first end cover (51) are driven by the magnetic coupling (6), and the rotor (3) and the first end cover (51) are connected with the speed reduction mechanism (4).

2. A magnetically coupled hub reduction motor according to claim 1, characterized in that The rotor (3) comprises a rotor support (31), the inner circumferential surface of the rotor support (31) is sleeved on the motor shaft (1) through a first bearing, the magnetic coupling (6) comprises a plurality of first magnets (61) and a plurality of second magnets (62), the first magnets (61) are located on the side surface of the rotor support (31), the second magnets (62) are located on the inner circumferential surface of the first end cover (51), the first magnets (61) and the second magnets (62) are oppositely arranged and can attract each other; after the coil on the stator (2) is electrified, the rotor (3) starts to rotate, and the rotor (3) drives the first end cover (51) to synchronously rotate through the magnetic coupling (6).

3. A magnetically coupled hub reduction motor according to claim 2, characterized in that The speed reduction mechanism (4) comprises a gear ring (43), a sun gear (41), a planet carrier (44) and a plurality of planet gears (42), the sun gear (41) is fixed on the rotor support (31), the planet gears (42) are in meshing connection with the sun gear (41), and meanwhile the planet gears (42) are in meshing connection with the inner circumferential surface of the gear ring (43), the gear ring (43) is fixed with the first end cover (51), the planet carrier (44) is sleeved and fixed on the motor shaft (1), the planet gears (42) are hinged on the planet carrier (44), the rotor support (31) drives the sun gear (41) to rotate, the sun gear (41) drives the planet gears (42) to rotate, the planet gears (42) rotate while driving the gear ring (43) to rotate, so that the first end cover (51) and the wheel rim (5) start to rotate; when the torsion of the wheel rim (5) and the first end cover (51) is greater than the suction force of the magnetic coupling (6), the magnetic coupling (6) automatically slips, and the rotor (3) drives the first end cover (51) to rotate through the speed reduction mechanism (4).

4. A magnetically coupled hub reduction motor according to claim 2, characterized in that The side surface of the rotor support (31) is an installation portion (311), the middle portion of the installation portion (311) is recessed inward to form a leaving portion (312), the first magnets (61) are located on the installation portion (311), and the leaving portion (312) is provided with a reinforcing rib (313).

5. A magnetically coupled hub reduction motor according to claim 4 wherein The stator (2) comprises a stator support (21), stator steel sheets (22) and coils wound on the stator steel sheets (22), the stator steel sheets (22) are fixed on the stator support (21) in a sleeving manner, the stator support (21) is fixed on the motor shaft (1) in a sleeving manner, the stator support (21) is provided with a clearance slot, and the clearance part (312) is located in the clearance slot.

6. A magnetically coupled hub reduction motor according to claim 2, characterized in that The rotor (3) is sleeved on the stator (2), the rotor (3) comprises a magnetic conducting ring (32) and a plurality of magnetic steels (33) located on the inner circumferential surface of the magnetic conducting ring (32), and the magnetic conducting ring (32) is fixed on the inner circumferential surface of the rotor support (31).

7. A magnetically coupled hub reduction motor as set forth in claim 1, wherein The rim (5) is integrally formed with the first end cover (51).

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