A transversely driven magnetic suspension hub motor

Abstract

In order to solve the problem of complex structure caused by the planetary gear reduction mechanism assembly used for driving and braking in the wheel hub motor in the prior art, the present invention proposes a transversely driven magnetic suspension wheel hub motor, the technical solution of which is: the rotor bar permanent magnet extends to the root of the driving winding and generates a rotating driving force and an axial turning force with the driving winding through an alternating current; the suspension bar permanent magnet and the suspension winding through an alternating current generate a suspension force. The present invention has a simple structure and reliable performance, which is conducive to the promotion of wheel hub motors.

Description

Technical Field

[0001] The present application relates to a magnetic levitation hub motor, and relates to the fields of motor technology, magnetic levitation technology and new energy vehicle technology. Background Art

[0002] With the development of computer intelligent control technology and wheel hub motor technology in recent years, the drive system of new energy vehicles tends to be driven by wheel hub motors. The wheel hub motor integrates power, transmission, braking and part of the suspension into the wheel hub motor, which has a higher power density, making the drive system of pure electric vehicles smaller and conducive to the space design of the whole vehicle. Based on the advantages of wheel hub motors such as flexible layout and simple mechanical transmission structure, wheel hub motor drive technology will have broad prospects for new energy vehicles.

[0003] The current technology, such as the hub motor disclosed in patent CN108242866, has a technical solution that "includes a motor shaft, a hub, a first outer end cover, a second outer end cover, a stator and a rotor, wherein the hub, the first outer end cover and the second outer end cover are fixedly connected to form an outer receiving cavity, the stator and the rotor are received in the outer receiving cavity, and also includes a first-stage planetary gear reduction mechanism and a second-stage planetary gear reduction mechanism, the input end of the first-stage planetary gear reduction mechanism is connected to the rotor, the output end of the second-stage planetary gear reduction mechanism is connected to the hub, and the output end of the first-stage planetary gear reduction mechanism is connected to the input end of the second-stage planetary gear reduction mechanism". This technical solution can be said to represent the characteristics of the current hub motor, which uses a planetary gear reduction mechanism assembly for driving and braking, and the problem it brings is the problem of complex structure. Summary of the invention

[0004] In order to solve the problem of complex structure caused by the planetary gear reduction mechanism assembly used for driving and braking in the hub motor in the prior art, the present invention proposes a transversely driven magnetic levitation hub motor. The present invention has a simple structure, adopts magnetic levitation and motor-like driving methods, separates the suspension assembly from the driving assembly, and greatly saves space.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a transversely driven magnetic suspension hub motor, comprising a stator winding assembly, a connecting assembly for connecting the stator winding assembly with a steering mechanism, a permanent magnet rotor assembly coaxially arranged outside the stator winding assembly, and a tire assembly arranged outside the permanent magnet rotor assembly, characterized in that:

[0006] The stator winding assembly includes a stator shaft, a driving winding arranged on one side of the stator shaft, and a suspension winding arranged on the other side of the stator shaft; the permanent magnet rotor assembly includes a plurality of rotor bar permanent magnets arranged at intervals of polarity, which are arranged on the radial inner side of the tire assembly close to the driving winding and protrude toward the stator shaft, and a plurality of suspension bar permanent magnets arranged at intervals of polarity close to the suspension winding; wherein a shielding plate for isolating magnetic lines of force is arranged between the rotor bar permanent magnets and the suspension bar permanent magnets; wherein the rotor bar permanent magnets extend to the root of the driving winding and generate a rotating driving force and a lateral turning force with the driving winding through which an alternating current is passed; and the suspension bar permanent magnets and the suspension winding through which an alternating current is passed generate a longitudinal suspension force.

[0007] The tire assembly comprises a rim and a tire; wherein the rim is arranged close to the stator shaft and the tire is arranged on the outside of the rim; wherein a plurality of rotor bar permanent magnets and a plurality of suspended bar permanent magnets are evenly distributed axially on the side of the rim facing the stator shaft; and a non-magnetic conductive sheet is arranged between the rotor bar permanent magnets and the suspended bar permanent magnets of the rim.

[0008] The connection assembly includes a cover assembly arranged on a stator winding assembly and a permanent magnet rotor assembly; wherein the cover assembly includes a stator cover and a rotor cover; the stator cover is arranged at both ends of a stator shaft, and includes a first end face section for fixing the stator shaft and a first stepped plane recessed outwardly arranged on the first end face section; the rotor cover is arranged on both axial end faces of the rim, and the rotor cover includes a second end face section and a second stepped plane recessed inwardly arranged on the second end face section; wherein the first stepped plane cooperates with the second stepped plane to enable the cover assembly to isolate the outside from the permanent magnet rotor assembly and the stator winding assembly.

[0009] The stator cover is provided with an axial hole through which the stator shaft passes.

[0010] The stator shaft also includes an isolation column arranged directly below the rotor bar-shaped permanent magnet; the axial thickness of the isolation column is consistent with that of the rotor bar-shaped permanent magnet.

[0011] The driving winding comprises a columnar magnetizer and a coil winding arranged on the columnar magnetizer; one end of the columnar magnetizer is evenly arranged on the stator shaft; the coil winding is arranged at the other end of the columnar magnetizer, and the root of the coil winding is arranged close to the stator shaft.

[0012] The driving winding and the suspension winding can be connected to IGBTs for control respectively. The frequency of IGBT conduction controls the frequency of driving winding conduction, so that the driving winding forms a rotating magnetic field. The rotating magnetic field acts on the rotor bar permanent magnet to rotate the permanent magnet rotor assembly. The IGBT controlling the suspension winding determines its own conduction frequency according to the conduction frequency of the driving winding, so that the rotating magnetic field generated by the suspension winding is consistent with the magnetic field formed by the suspension bar permanent magnet, and the longitudinal suspension force exists continuously. When turning is required, the stator shaft drives the driving winding to rotate. Due to the lateral repulsive force between the driving winding and the rotor bar permanent magnet, the rotor bar permanent magnet will follow the driving winding to rotate in the same direction and angle, so as to achieve the purpose of turning.

[0013] The beneficial effects brought by the present invention are as follows: the present invention arranges the driving winding and the suspension winding and the bar-shaped permanent magnet and the arc-shaped permanent magnet respectively on the outside of the stator shaft, and suspends the permanent magnet rotor assembly on the outside of the stator winding assembly under the premise of passing the alternating current through the suspension winding, and at the same time, using the principle of the motor, passes the alternating current through the driving winding to drive the permanent magnet rotor assembly to rotate at a high speed. The present invention has a simple structure and reliable performance, and is conducive to the promotion of hub motors. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is the front view of the present invention.

[0015] Figure 2 It is the front view of the drive winding of the present invention.

[0016] Figure 3 It is a schematic diagram of the arrangement of the bar permanent magnets of the present invention.

[0017] Figure 4 It is a schematic diagram of the suspension assembly mechanism of the present invention.

[0018] Figure 5 It is a three-dimensional diagram of this hair.

[0019] Figure 6 yes Figure 1 Enlarged view of point E in FIG.

[0020] Figure 7 It is a schematic diagram of the drive winding structure. DETAILED DESCRIPTION

[0021] The present invention will be further described below in conjunction with the accompanying drawings.

[0022] like Figures 1 to 7In order to solve the above technical problems, the technical solution adopted by the present invention is: the above-mentioned transversely driven magnetic suspension hub motor includes a stator winding assembly, a connecting assembly for connecting the stator winding assembly with a steering mechanism, a permanent magnet rotor assembly coaxially arranged outside the stator winding assembly, and a tire assembly arranged outside the permanent magnet rotor assembly, characterized in that: the stator winding assembly includes a stator shaft 4, a driving winding 3 arranged on one side of the stator shaft 4, and a suspension winding 2 arranged on the other side of the stator shaft 4; the permanent magnet rotor assembly includes a tire assembly arranged on the tire assembly A plurality of rotor bar permanent magnets 6 with polarities spaced apart are arranged inwardly close to the driving winding 3 and protruding toward the stator shaft 4, and a plurality of suspension bar permanent magnets 7 with polarities spaced apart are arranged close to the suspension winding 2; wherein a shielding plate for isolating magnetic lines of force is provided between the rotor bar permanent magnets 6 and the suspension bar permanent magnets 7; wherein the rotor bar permanent magnets 6 extend to the root of the driving winding 3 and generate a rotational driving force and a lateral turning force with the driving winding 3 through which an alternating current is passed; and the suspension bar permanent magnets 7 and the suspension winding 2 through which an alternating current is passed generate a longitudinal suspension force.

[0023] It should be made clear that the steering mechanism is a common component in the existing automotive field, and is a mechanism for controlling the driving direction of various types of wheeled or tracked vehicles. The steering mechanism of a wheeled vehicle is generally composed of a steering gear and a steering rod system. When power steering is adopted, a hydraulic pump, a control valve, a cylinder and an oil storage tank are also required, which are collectively called a hydraulic power-assisting mechanism. The stator shaft 4 in the present invention is connected to the output mechanism of the steering mechanism.

[0024] It should be clear that the rotor bar permanent magnet 6 is arranged toward the stator shaft 4. Figure 1 It can be seen that the end of the rotor bar permanent magnet 6 is flush with the root of the drive winding 3. A plurality of suspended bar permanent magnets 7 form a ring arranged outside the stator shaft 4. The suspension force refers to the permanent magnet rotor assembly being permanently suspended outside the stator winding assembly.

[0025] Specifically, the stator shaft 4 can be connected to the output mechanism of the steering mechanism through connecting components such as couplings in the connecting assembly. When the steering mechanism applies force to the stator shaft 4, the stator shaft 4 drives the drive winding 3 to rotate. Due to the effect of the magnetic field, the rotor bar permanent magnet 6 will rotate in the same direction and angle as the drive winding 3, thereby achieving the purpose of turning.

[0026] Specific implementation method I:

[0027] The two sets of windings with different or same pole numbers installed on the stator shaft 4 of the present invention are equivalent to two motors with different or same pole numbers and different magnetic fields. The driving and suspension of the magnetic suspension motor are realized by using the motor drive control technology and magnetic pole characteristics; the driving winding 3 and the suspension winding 2 are two sets of superconducting magnet windings, and the driving winding 3 can be connected to the stator bracket on the connecting component. A columnar magnetic conductor 301 is set on the stator shaft 4 to install the driving winding 3, with a total of 20 winding coils. After passing three-phase alternating current, torque is generated with 20 rotor bar permanent magnets 6, which can be called driving windings; for the convenience of driving, the end of the stator shaft 4 corresponding to one side of the driving winding 3 is axially connected to the steering mechanism through a coupling or other connecting components. Another set of suspension windings 2 is located on the outside of the wheel hub, and the suspension windings 2 are installed radially. The suspension windings 2 have a total of 24 coils. After being energized, they use the principle of like magnetic poles repelling each other to generate suspension force with 22 evenly distributed suspension bar permanent magnets 7, which is called longitudinal suspension windings. According to the basic theory of automobile design, the driving windings 3 and suspension windings 2 of the magnetic suspension hub motor proposed in the present invention use superconducting material coils to make superconducting magnets, and use the superconducting properties of the superconducting magnets to make the magnetic suspension hub motor have powerful driving force and suspension force.

[0028] Furthermore, the permanent magnet rotor assembly of the magnetic levitation hub motor proposed in the present invention includes two sets of permanent magnets with different or same pole numbers; the rotor bar permanent magnets 6 and the drive winding 3 generate driving force when energized accordingly, and the suspension bar permanent magnets 7 and the suspension winding 2 repel each other to generate suspension force when energized.

[0029] like Figure 2 , a sleeve 4A larger than the diameter of the stator shaft 4 can be provided on the stator shaft 4, and then a columnar magnetizer 301 is provided on the sleeve 4A, and then the columnar magnetizer 301 is fully wound with the coil winding 302 to form the driving winding 3. The columnar magnetizer 301 can also be directly provided on the stator shaft 4, such as Figure 1 , the coil winding 302 is wound from outside to inside to the half position of the columnar magnetic conductor 301. The outside to inside corresponds to the direction of the radial direction of the stator shaft 4 from large to small.

[0030] The manufacturing structure of the suspension winding 2 can be consistent with the structure of the driving winding 3.

[0031] Furthermore, the tire assembly in the present invention includes a rim 9 and a tire 1; wherein the rim 9 is arranged close to the stator shaft 4, and the tire 1 is arranged outside the rim 9; wherein a plurality of rotor bar permanent magnets 6 and a plurality of suspended bar permanent magnets 7 are evenly arranged on the side of the rim 9 facing the stator shaft 4; and a non-magnetic conductive sheet 5 is arranged between the rotor bar permanent magnets 6 and the suspended bar permanent magnets 7 of the rim 9. In order to ensure airtightness, a plastic shielding layer can be arranged between the rim 9 and the rotor bar permanent magnets 6.

[0032] like Figure 1The cover assembly 10 includes a stator cover 1001 and a rotor cover 1002; the stator cover 1001 is arranged at both ends of the stator shaft 4, including a first end face section 10A for fixing the stator shaft 4 and a first stepped plane 10B recessed outwardly arranged on the first end face section 10A; the rotor cover 1002 is arranged on both axial end faces of the rim 9, and the rotor cover 1002 includes a second end face section 10C and a second stepped plane 10D recessed inwardly arranged on the second end face section 10C; wherein the first stepped plane 10B cooperates with the second stepped plane 10D to isolate the outside from the permanent magnet rotor assembly and the stator winding assembly. The stator cover 1001 and the rotor cover 1002 are made of non-magnetic conductive materials.

[0033] The first step plane 10B and the second step plane 10D overlap without contacting each other, so that the cover assembly 10 forms a closed body, and external debris cannot enter the interior, thereby ensuring safety.

[0034] In addition, the drive winding 3 and suspension winding 2 of the hub motor of the magnetic levitation hub motor proposed in the present invention are evenly distributed on the outside of the stator shaft 4 with the axis of the stator shaft 4 as the center, and the rotor bar permanent magnet 6 and suspension bar permanent magnet 7 are evenly distributed with the axis of the stator shaft 4 as the center.

[0035] Preferably, plastic sheets for shielding magnetic lines of force are arranged between the suspended bar-shaped permanent magnets 7 .

[0036] A particularly outstanding technology is that the magnetic levitation hub motor proposed in the present invention eliminates the complex mechanical transmission mechanism, such as the brake disc, reducer, planetary gear, driving wheel and other braking elements of the reduction mechanism, and the complex bearing components in the drive mechanism are also completely omitted, which greatly simplifies the complex mechanical structure and reduces the loss of energy transmitted at each level due to mechanical connection; the motor control technology is used to achieve wheel braking, recover the energy generated during the braking process, and improve the energy utilization rate; at the same time, a large amount of space is saved, the drive system is simpler, the wheel travels more smoothly and reliably, and the car has a stronger ride comfort.

[0037] Specifically, the driving winding 3 and the suspension winding 2 can be connected to IGBTs for control respectively, and the IGBT conduction frequency controls the conduction frequency of the driving winding 3, thereby determining the rotation speed of the permanent magnet rotor assembly of the present invention. The IGBT controlling the suspension winding 2 determines its own synchronization frequency according to the conduction frequency of the driving winding 3, so as to control the continuous existence of the suspension force between the suspension bar permanent magnet 7 and the suspension winding 2.

[0038] The driving winding 3 and the suspension winding 2 can be connected to IGBT for control respectively. The frequency of IGBT conduction controls the frequency of driving winding 3 conduction, so that the driving winding 3 forms a rotating magnetic field. The rotating magnetic field acts on the rotor bar permanent magnet 6 to rotate the permanent magnet rotor assembly. The IGBT controlling the suspension winding 2 determines its own conduction frequency according to the conduction frequency of the driving winding 3, so that the rotating magnetic field generated by the suspension winding 2 is consistent with the magnetic field formed by the suspension bar permanent magnet 7, and the longitudinal suspension force exists continuously. When turning is required, the stator shaft 4 drives the driving winding 3 to rotate. Due to the lateral repulsive force between the driving winding 3 and the rotor bar permanent magnet 6, the rotor bar permanent magnet 6 will follow the driving winding 3 to rotate in the same direction and angle, so as to achieve the purpose of turning.

[0039] It should be noted that the non-magnetic conductive sheet 5 and the isolation column 8 are both made of non-magnetic conductive materials, such as plastic. The columnar magnetic conductive body 301 is made of magnetic conductive materials, such as pure iron.

[0040] It should be clarified that the transverse and longitudinal directions mentioned in the present invention respectively refer to: the transverse direction corresponds to the axial direction of the stator shaft 4; the longitudinal direction corresponds to the radial direction of the stator shaft 4.

[0041] The above description is only a preferred embodiment of the invention and is not intended to limit the invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the invention should be included in the protection scope of the invention.

Claims

1. A transversely driven magnetic suspension hub motor, comprising a stator winding assembly, a connecting assembly for connecting the stator winding assembly to a steering mechanism, a permanent magnet rotor assembly coaxially arranged outside the stator winding assembly, and a tire assembly arranged outside the permanent magnet rotor assembly, Features: The stator winding assembly comprises a stator shaft (4), a drive winding (3) arranged on one side of the stator shaft (4), and a suspension winding (2) arranged on the other side of the stator shaft (4); The permanent magnet rotor assembly comprises a plurality of rotor bar permanent magnets (6) arranged at intervals in polarity and located radially inside the tire assembly near the drive winding (3) and protruding toward the stator shaft (4), and a plurality of suspension bar permanent magnets (7) arranged at intervals in polarity and located near the suspension winding (2); Wherein, a shielding plate for isolating magnetic lines of force is provided between the rotor bar permanent magnet (6) and the suspension bar permanent magnet (7); The rotor bar permanent magnet (6) extends to the root of the driving winding (3) and generates a rotational driving force and a lateral turning force with the driving winding (3) through which an alternating current is passed; the suspension bar permanent magnet (7) generates a longitudinal suspension force with the suspension winding (2) through which an alternating current is passed; The tire assembly comprises a rim (9) and a tire (1); The wheel rim (9) is arranged close to the stator shaft (4), and the tire (1) is arranged on the outside of the wheel rim (9); Wherein, a plurality of rotor bar permanent magnets (6) and a plurality of suspended bar permanent magnets (7) are evenly distributed axially on one side of the wheel rim (9) facing the stator shaft (4); a non-magnetic conductive sheet (5) is provided between the rotor bar permanent magnets (6) and the suspended bar permanent magnets (7) of the wheel rim (9); The driving winding (3) and the suspension winding (2) are respectively connected to IGBTs for control. The IGBT conduction frequency controls the conduction frequency of the driving winding (3), so that the driving winding (3) forms a rotating magnetic field. The rotating magnetic field acts on the rotor bar permanent magnet (6) to rotate the permanent magnet rotor assembly. The IGBT controlling the suspension winding (2) determines its own conduction frequency according to the conduction frequency of the driving winding (3), so that the rotating magnetic field generated by the suspension winding (2) is consistent with the magnetic field formed by the suspension bar permanent magnet (7), and a longitudinal suspension force is continuously present. When turning is required, the stator shaft (4) drives the driving winding (3) to rotate. Due to the lateral repulsive force between the driving winding (3) and the rotor bar permanent magnet (6), the rotor bar permanent magnet (6) will rotate in the same direction and angle as the driving winding (3), thereby achieving the purpose of turning.

2. A transversely driven magnetically suspended hub motor according to claim 1, Features: The connection assembly comprises a cover assembly (10) arranged on the stator winding assembly and the permanent magnet rotor assembly; Wherein, the cover assembly (10) comprises a stator cover (1001) and a rotor cover (1002); The stator cover (1001) is arranged at both ends of the stator shaft (4), and comprises a first end surface section (10A) for fixing the stator shaft (4) and a first stepped plane (10B) recessed outwards and arranged on the first end surface section (10A); The rotor cover (1002) is arranged on both axial end faces of the wheel rim (9), and the rotor cover (1002) comprises a second end face section (10C) and an inwardly recessed second stepped plane (10D) arranged on the second end face section (10C); The first step plane (10B) and the second step plane (10D) cooperate to enable the cover assembly to isolate the outside from the permanent magnet rotor assembly and the stator winding assembly.

3. The transversely driven magnetic suspension hub motor according to claim 1, Features: The stator cover (1001) is provided with an axial hole through which the stator shaft (4) passes.

4. The transversely driven magnetically suspended hub motor according to claim 1, Features: The stator shaft (4) also includes an isolation column (8) arranged directly below the rotor bar-shaped permanent magnet (6); the axial thickness of the isolation column (8) is consistent with that of the rotor bar-shaped permanent magnet (6).

5. The transversely driven magnetically suspended hub motor according to claim 1, Features: The driving winding (3) comprises a columnar magnetic conductor (301) and a coil winding (302) arranged on the columnar magnetic conductor (301); One end of the columnar magnetic conductor (301) is evenly arranged on the stator shaft (4); the coil winding (302) is arranged at the other end of the columnar magnetic conductor (301), and the root of the coil winding (302) is arranged close to the stator shaft (4).

Images