Double-rotor double-stator hub motor

Abstract

The utility model relates to a double-rotor double-stator wheel hub motor, which comprises a first rotor, a second rotor, a first stator and a second stator which are coaxially arranged, the first stator and the second stator are fixedly sleeved on a motor shaft, the first stator is positioned on the side surface of the second stator, the first rotor is sleeved on the outer side of the first stator, and the second stator is positioned on the side surface of the second stator. The second rotor sleeves the outer side of the second stator, and the outer diameter of the second stator is smaller than the outer diameter of the first stator. Compared with the prior art, the first rotor and the first stator form first power, the second rotor and the second stator form second power, the first power and the second power are mutually independent and form a dual-motor power operation mode, the dual power is of an outer rotor structure, the dual power can work simultaneously to improve torque, and the endurance mileage can be improved through single-power work. Power adjustment is flexible, and the requirements for power performance and economy of the electric vehicle are met.

Description

Technical Field

[0001] This utility model relates to a dual-rotor, dual-stator hub motor, belonging to the field of hub motor technology. Background Technology

[0002] Electric vehicles, including electric bicycles, electric motorcycles, and electric cars, serve as transportation tools. However, in poor road conditions, insufficient power can hinder their normal operation. While hub motors require high peak torque to meet climbing and acceleration performance requirements, electric vehicles typically operate in low-torque ranges, resulting in low torque load and efficiency, thus impacting driving range. This highlights a trade-off between performance and economy. Current single-motor hub motors lack sufficient torque density to resolve this conflict. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing a dual-rotor, dual-stator hub motor with flexible power adjustment.

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

[0005] A dual-rotor dual-stator hub motor includes a first rotor, a second rotor, a first stator, and a second stator coaxially arranged. The first stator and the second stator are both sleeved and fixed on the motor shaft. The first stator is located on the side of the second stator. The first rotor is sleeved on the outside of the first stator, and the second rotor is sleeved on the outside of the second stator. The outer diameter of the second stator is smaller than the outer diameter of the first stator.

[0006] As a further optimization of the above technical solution: the first stator includes a first stator core and a first stator winding located on the first stator core, the second stator includes a second stator core and a second stator winding located on the second stator core, the first rotor includes a first magnetic ring and a plurality of first permanent magnets arranged circumferentially on the inner circumferential surface of the first magnetic ring, and the second rotor includes a second magnetic ring and a plurality of second permanent magnets arranged circumferentially on the inner circumferential surface of the second magnetic ring.

[0007] As a further optimization of the above technical solution: the first stator further includes a first stator bracket located on the inner circumferential surface of the first stator core, and the second stator further includes a second stator bracket located on the inner circumferential surface of the second stator core. Both the first stator bracket and the second stator bracket are sleeved and fixed on the motor shaft.

[0008] As a further optimization of the above technical solution: the first stator support includes a middle part and an annular part located on the outer peripheral surface of the middle part, the first stator core is sleeved on the outer peripheral surface of the annular part, there is an installation space between the side of the middle part and the end face of the annular part, and the outer diameter of the second rotor is smaller than the inner diameter of the annular part, so that the second rotor and the second stator can enter the installation space.

[0009] As a further optimization of the above technical solution, it also includes a wheel hub and a hub cover installed on the side of the wheel hub. The first magnetic ring is welded to the wheel hub, and an installation groove is formed on the inner circumferential surface of the hub cover. The second magnetic ring is fixed in the installation groove.

[0010] As a further optimization of the above technical solution: the end of the first magnetic ring is bent inward to form a second mounting part, the outer peripheral surface of the hub cover is provided with an outwardly protruding positioning ring and a mounting ring protruding from the positioning ring, the end of the hub cover passes through the second mounting part and enters the mounting space, the second mounting part and the outer peripheral surface of the positioning ring are in contact, the mounting ring is located on the side of the second mounting part, and the screw passes through the mounting ring and is fixed on the second mounting part.

[0011] As a further optimization of the above technical solution, it also includes an end cover and a disc brake cover. Both the end cover and the disc brake cover are sleeved on the motor shaft through bearings. The end of the first magnetic ring is bent outward to form a first mounting part. The end cover is mounted on the first mounting part. The end cover is located on the side of the wheel hub, and the disc brake cover is mounted on the hub cover.

[0012] As a further optimization of the above technical solution: a wire outlet hole is formed on the motor shaft, and the wire outlet hole is located on the end cover side.

[0013] Compared with the prior art, in this utility model, the first rotor and the first stator constitute the first power source, and the second rotor and the second stator constitute the second power source. These two are independent of each other, forming a dual-motor power operation mode. Both power sources are external rotor structures. When high-speed operation is required, the second stator winding on the second stator is energized; during normal operation (balancing torque and speed), the first stator winding on the first stator is energized; when the electric vehicle needs high torque output for climbing hills or rapid acceleration, the first and second stator windings are energized simultaneously. Simultaneous operation of both power sources increases torque, while single-power operation increases range. The power adjustment is flexible, meeting the power and economy requirements of electric vehicles. Simultaneously, the first rotor and the first stator, the second stator, and the second stator... The two rotors and the second stator are set up completely independently, which is beneficial to production and improves motor efficiency. It avoids the problems of shared rotors affecting the magnetic circuit, resulting in low motor efficiency and short range. During installation, the second rotor and the second stator are located in the installation space on the first stator bracket, making full use of the space and reducing the axial width of the motor. At the same time, by bending the two ends of the first magnetic ring outward and inward respectively to form the first mounting part and the second mounting part, the end cover and hub cover are installed on the first mounting part and the second mounting part respectively. This breaks the conventional limitation that the wall thickness of the magnetic ring must be greater than the diameter of the fixed thread hole, which greatly reduces the wall thickness of the magnetic ring, thereby reducing the amount and weight of magnetic ring material, reducing material costs, and realizing the lightweight design of the motor. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0015] Figure 2 This is a cross-sectional structural diagram of the present invention.

[0016] Figure 3 This is an exploded structural diagram of the present invention. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. For example... Figure 1-3 As shown, a dual-rotor, dual-stator hub motor includes a first rotor 1, a second rotor 2, a first stator 3, and a second stator 4 coaxially arranged. Both the first stator 3 and the second stator 4 are sleeved and fixed on a motor shaft 9, with the first stator 3 located on the side of the second stator 4. The first rotor 1 is sleeved on the outside of the first stator 3, and the second rotor 2 is sleeved on the outside of the second stator 4. The outer diameter of the second stator 4 is smaller than the outer diameter of the first stator 3.

[0018] In the above technical solution: the first stator 3 includes a first stator core 31 and a first stator winding located on the first stator core 31; the second stator 4 includes a second stator core 41 and a second stator winding located on the second stator core 41. The first rotor 1 includes a first magnetic ring 12 and a plurality of first permanent magnets 11 arranged circumferentially on the inner circumferential surface of the first magnetic ring 12; the second rotor 2 includes a second magnetic ring 22 and a plurality of second permanent magnets 21 arranged circumferentially on the inner circumferential surface of the second magnetic ring 22.

[0019] In the above technical solution: the first stator 3 further includes a first stator bracket 32 ​​located on the inner circumferential surface of the first stator core 31, and the second stator 4 further includes a second stator bracket 42 located on the inner circumferential surface of the second stator core 41. Both the first stator bracket 32 ​​and the second stator bracket 42 are sleeved and fixed on the motor shaft 9. The first stator bracket 32 ​​includes a middle portion 321 and an annular portion 322 located on the outer circumferential surface of the middle portion 321. The first stator core 31 is sleeved on the outer circumferential surface of the annular portion 322. There is an installation space between the side surface of the middle portion 321 and the end face of the annular portion 322. The outer diameter of the second rotor 2 is smaller than the inner diameter of the annular portion 322, allowing the second rotor 2 and the second stator 4 to enter the installation space. This ensures that the installation of the second rotor 2 and the second stator 4 fully utilizes the installation space within the first stator bracket 32, thereby reducing the axial width of the motor.

[0020] The above technical solution also includes a wheel hub 5 and a hub cap 6 installed on the side of the wheel hub 5. The first magnetic ring 12 is welded to the wheel hub 5. A mounting groove is formed on the inner circumferential surface of the hub cap 6, and the second magnetic ring 22 is fixed in the mounting groove.

[0021] In the above technical solution: the end of the first magnetic ring 12 is bent inward to form the second mounting portion 14. The outer circumferential surface of the hub cover 6 has an outwardly protruding positioning ring 62 and a mounting ring 61 protruding from the positioning ring 62. The end of the hub cover 6 passes through the second mounting portion 14 and enters the mounting space. The second mounting portion 14 and the outer circumferential surface of the positioning ring 62 are in contact. The mounting ring 61 is located on the side of the second mounting portion 14. Screws pass through the mounting ring 61 and are fixed to the second mounting portion 14, completing the installation of the hub cover 6 and the hub 5. Several reinforcing ribs 63 are also provided between the side of the positioning ring 62 and the outer circumferential surface of the hub cover 6.

[0022] The above technical solution also includes an end cover 7 and a disc brake cover 8, both of which are mounted on the motor shaft 9 via bearings. The end of the first magnetic ring 12 is bent outward to form a first mounting portion 13, and the end cover 7 is mounted on the first mounting portion 13. The end cover 7 is located on the side of the hub 5. The disc brake cover 8 is mounted on the hub cover 6.

[0023] In the above technical solution: a wire outlet hole 91 is made on the motor shaft 9, and the wire outlet hole 91 is located on the side of the end cover 7.

[0024] In this invention, the first rotor 1 and the first stator 3 constitute the first power source, and the second rotor 2 and the second stator 4 constitute the second power source. These two sources operate independently, forming a dual-motor power operation mode. Both power sources are external rotor structures. For high-speed operation, the second stator winding on the second stator 4 is energized; for normal operation (balancing torque and speed), the first stator winding on the first stator 3 is energized; when the electric vehicle needs high torque output for tasks such as climbing hills or rapid acceleration, both the first and second stator windings are energized simultaneously. Simultaneous operation of both power sources increases torque, while single-power operation increases range. The power adjustment is flexible, meeting the power and economy requirements of electric vehicles. Furthermore, the first rotor 1 and the first stator 3, the second rotor 2 and the second stator 4... 4. Completely independent setup is beneficial for improving motor efficiency during production and avoids situations where shared rotors affect the magnetic circuit, resulting in low motor efficiency and short range. During installation, the second rotor 4 and the second positioning 5 are located within the installation space on the first stator bracket 32, making full use of the space and thus reducing the axial width of the motor. At the same time, by bending the two axial ends of the first magnetic ring 12 outward and inward respectively to form the first mounting part 13 and the second mounting part 14, the end cover 7 and the hub cover 6 are respectively installed on the first mounting part 13 and the second mounting part 14. This breaks the conventional limitation that the wall thickness of the magnetic ring must be greater than the diameter of the fixed thread hole, greatly reducing the wall thickness of the magnetic ring, thereby reducing the amount and weight of magnetic ring material, reducing material costs, and realizing the lightweight design of the motor.

[0025] 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 dual rotor dual stator wheel motor, characterized in that The motor comprises a first rotor (1), a second rotor (2), a first stator (3) and a second stator (4) arranged coaxially, the first stator (3) and the second stator (4) are sleeved and fixed on a motor shaft (9), the first stator (3) is located on the side of the second stator (4), the first rotor (1) is sleeved on the outside of the first stator (3), the second rotor (2) is sleeved on the outside of the second stator (4), and the outer diameter of the second stator (4) is smaller than the outer diameter of the first stator (3).

2. A dual rotor dual stator wheel motor according to claim 1, characterized in that The first stator (3) comprises a first stator core (31) and a first stator winding located on the first stator core (31), the second stator (4) comprises a second stator core (41) and a second stator winding located on the second stator core (41), the first rotor (1) comprises a first magnetic conducting ring (12) and a plurality of first permanent magnets (11) arranged on the inner circumferential surface of the first magnetic conducting ring (12) in the circumferential direction, and the second rotor (2) comprises a second magnetic conducting ring (22) and a plurality of second permanent magnets (21) arranged on the inner circumferential surface of the second magnetic conducting ring (22) in the circumferential direction.

3. A dual rotor dual stator wheel motor according to claim 2, characterized in that The first stator (3) further comprises a first stator support (32) located on the inner circumferential surface of the first stator core (31), the second stator (4) further comprises a second stator support (42) located on the inner circumferential surface of the second stator core (41), and the first stator support (32) and the second stator support (42) are both sleeved and fixed on the motor shaft (9).

4. A dual rotor dual stator wheel motor according to claim 3, characterized in that The first stator support (32) comprises an intermediate part (321) and an annular part (322) located on the outer circumferential surface of the intermediate part (321), the first stator core (31) is sleeved on the outer circumferential surface of the annular part (322), there is an installation space between the side surface of the intermediate part (321) and the end surface of the annular part (322), the outer diameter of the second rotor (2) is smaller than the inner diameter of the annular part (322), so that the second rotor (2) and the second stator (4) can enter the installation space.

5. A dual rotor dual stator wheel motor according to claim 4, characterized in that A hub (5) and a hub cover (6) mounted on the side surface of the hub (5) are further included, the first magnetic conducting ring (12) is welded on the hub (5), an installation groove is made on the inner circumferential surface of the hub cover (6), and the second magnetic conducting ring (22) is fixed in the installation groove.

6. A dual rotor dual stator wheel motor according to claim 5, characterized in that An end portion of the first magnetic conducting ring (12) is inwardly bent to form a second mounting part (14), an outer circumferential surface of the hub cover (6) is provided with a positioning ring (62) protruding outward and a mounting ring (61) protruding from the positioning ring (62), an end portion of the hub cover (6) penetrates through the second mounting part (14) and enters the installation space, an outer circumferential surface of the second mounting part (14) is in contact with the positioning ring (62), the mounting ring (61) is located on the side surface of the second mounting part (14), and a screw penetrates through the mounting ring (61) and is fixed on the second mounting part (14).

7. A dual rotor dual stator wheel motor according to claim 5, characterized in that Also include end cover (7) and disc brake cover (8), the end cover (7) and the disc brake cover (8) are all set on the motor shaft (9) through bearing sleeve, the end of the first magnetic ring (12) is outwardly bent to form a first mounting portion (13), the end cover (7) is installed on the first mounting portion (13), the end cover (7) is located on the side of the hub (5), the disc brake cover (8) is installed on the hub cover (6).

8. A dual rotor dual stator wheel motor according to claim 7, characterized in that The motor shaft (9) is provided with a wire outlet hole (91), and the wire outlet hole (91) is located on the side of the end cover (7).

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