阅读说明：本技术 一种轴向磁场轮毂电机 (Axial magnetic field hub motor ) 是由 眭华兴 于 2020-07-09 设计创作，主要内容包括：本发明公开了一种轴向磁场轮毂电机,包括在轮毂空间内与主轴连接的电机和行星齿轮减速机构,电机为单气隙结构轴向磁场电机,电机转子组件通过包含有角接触球轴承的具有并列的滚动体的轴承单元与主轴转动连接,定子组件包括定子铁芯、线圈、定子轭盘和定子架,定子铁芯为不同宽度的硅钢材料的薄片沿径向方向叠合而成,定子铁芯与定子轭盘和定子架连接,或者定子铁芯通过定子轭盘与定子架连接,定子架与主轴固定连接,本发明轮毂电机能大幅提高电动自行车的续行里程,能在现有条件下实现轴向磁场轮毂电机高效低成本地批量生产。(The invention discloses an axial magnetic field hub motor, which comprises a motor and a planetary gear speed reducing mechanism, wherein the motor and the planetary gear speed reducing mechanism are connected with a main shaft in a hub space, the motor is an axial magnetic field motor with a single air gap structure, a motor rotor assembly is rotationally connected with the main shaft through a bearing unit which comprises an angular contact ball bearing and is provided with parallel rolling bodies, a stator assembly comprises a stator core, a coil, a stator yoke disc and a stator frame, the stator core is formed by laminating thin sheets of silicon steel materials with different widths along the radial direction, the stator core is connected with the stator yoke disc and the stator frame, or the stator core is connected with the stator frame through the stator yoke disc, and the stator frame is fixedly connected with the main shaft.)

1. The utility model provides an axial magnetic field in-wheel motor, includes motor and planetary gear reduction mechanism be connected with the main shaft in the wheel hub space, the motor passes through planetary gear reduction mechanism drives wheel hub and rotates characterized by: the motor is an axial magnetic field motor with a single air gap structure and comprises a rotor assembly and a stator assembly, the rotor assembly is rotationally connected with the main shaft through a bearing unit which comprises an angular contact ball bearing and is provided with parallel rolling bodies, the stator assembly comprises a plurality of stator cores, a plurality of coils, a stator yoke disc and a stator frame, the stator cores are formed by overlapping and connecting a plurality of thin sheets of silicon steel materials with different widths along the radial direction into a whole, the coils are sleeved at one end of the stator core close to the rotor assembly, the stator yoke disc is provided with a plurality of first mortises in a circumferential array, the stator frame is provided with a radial tray, the stator core inserted into the first mortises exceeds the stator yoke disc and is connected with the radial tray, or the stator yoke disc is connected with the stator core inserted into the first mortises and is connected with the radial tray, the stator frame is fixedly connected with the main shaft.

2. The axial field in-wheel motor of claim 1, wherein the bearing unit is a double row angular contact ball bearing, or a series combination of a deep groove ball bearing and a single row angular contact ball bearing, or a series combination of two single row angular contact ball bearings.

3. The axial field in-wheel motor of claim 1, wherein the stator yoke is formed by laminating a plurality of thin discs of silicon steel material in the axial direction, or is formed by die-pressing and sintering SMC composite soft magnetic material.

4. The axial field in-wheel motor of claim 1, wherein the stator core is formed as a unitary structure by a lamination welding process, the welding surfaces of the stator core include at least the end surface of the stator core distal from the rotor assembly, and the stator core is connected to the stator yoke disc or the stator yoke disc and the stator frame in a tenon-and-mortise manner.

5. The axial field in-wheel motor of claim 1, wherein the axial height of the coil is less than the axial length of the stator core, and the coil and the stator core are insulated by an insulated coil frame or an insulating material coated on the stator core.

6. The in-wheel motor with an axial magnetic field according to claim 1, wherein the stator core is provided with at least one second mortise on two radially overlapped surfaces perpendicular to a rotating surface of the rotor assembly on a side away from the rotor assembly, the second mortise is a "U" shaped slot, the radial tray of the stator frame is provided on a side away from the rotor assembly, the radial tray is provided with a third mortise corresponding to the first mortise, the first mortise and the third mortise are open slots, a solid portion of the stator core located in the second mortise area is radially inserted into the first mortise and the third mortise, and a slot edge of the first mortise and the third mortise is clamped in the second mortise, so that the stator core is connected with the stator yoke disc and the stator frame in a mortise-and-tenon joint manner.

7. The in-wheel motor with axial magnetic field as claimed in claim 1, wherein the stator core has at least one second mortise on two radially overlapped surfaces perpendicular to the rotation surface of the rotor assembly on a side away from the rotor assembly, the second mortise is a "U" shaped slot, the first mortise of the stator yoke disc is an open slot, the first connecting holes are further formed on a side close to the shaft, the radial tray of the stator frame is disposed on a side close to the rotor assembly, the radial tray is provided with second connecting holes corresponding to the first connecting holes, the stator yoke disc and the stator frame are riveted or bolted through the first connecting holes and the second connecting holes, a solid portion of the stator core located in the second mortise region is radially inserted into the first mortise, and a slot edge of the first mortise is clamped in the second mortise, thereby the stator core and the stator yoke disc form a tenon-and-mortise structure for connection.

8. The axial magnetic field hub motor of claim 1, wherein the stator core is provided with at least one second mortise on two radially overlapped surfaces perpendicular to a rotating surface of the rotor assembly on a side away from the rotor assembly, the second tongue-and-groove is an L-shaped groove, a plurality of first connecting holes are also arranged on the side close to the shaft of the stator yoke disc, the radial tray of the stator frame is arranged at one side close to the rotor component, a second connecting hole corresponding to the first connecting hole is arranged on the radial tray, the stator yoke disc and the stator frame are riveted or bolted through the first connection hole and the second connection hole, the solid part of the stator core positioned in the second mortise interval is inserted into the first mortise, therefore, the stator core and the stator yoke disc are connected in a mortise and tenon structure, and then the stator core and the stator yoke disc are fixedly connected in a welding or riveting mode.

9. The axial magnetic field hub motor of claim 7 or 8, wherein the second mortise is not provided when the depth of the second mortise is 0, and one end of the stator core, which is not sleeved with the coil, is inserted into the first mortise, so that the stator core and the stator yoke disc are connected in a mortise and tenon joint structure, and then the stator core and the stator yoke disc are fixedly connected by welding or riveting.

Technical Field

The invention relates to the technical field of hub motors of electric bicycles, in particular to a hub motor stator with a gear in an axial magnetic field.

Background

The existing electric bicycle mainly adopts a low-speed hub motor, and also adopts a geared hub motor of a planetary gear reduction mechanism, such as Chinese patents CN03127256.8 and CN201510104597.9 of an outer rotor motor with a through shaft structure, and also such as a U.S. patent US20050176542A1 of an inner rotor motor with a half shaft structure, the hub motors are all direct current permanent magnet motors with radial magnetic fields, the efficiency of the motors is not high, a high-efficiency interval is deviated to a high-power interval, and a driving motor usually runs in the low-efficiency interval when the vehicle normally runs, and the continuous mileage is short; the disclosed technology is that silicon steel sheet winding tape is adopted to wind stator core through continuous punching sheet, stator teeth, winding slot and stator yoke of stator are integrated structure, compensation and correction need to be carried out on slot distance continuously in the manufacturing process, the manufacturing efficiency of stator core is low and cost is high, and coil winding can only be completed manually at present.

Disclosure of Invention

The invention aims to provide an axial magnetic field motor which meets the requirements of GB 17761-2018' safety technical Specification of electric bicycles, is applied to the field of electric bicycles with excellent performance at low cost under the existing production technical conditions, and meets the requirement of people on the increase of the driving mileage.

The technical idea is as follows: the axial magnetic field motor with the single air gap structure is characterized in that the stator component is fixedly connected with a main shaft, the hub motor with the gear is of a through shaft structure, optimal space utilization and the lowest manufacturing cost are achieved, the technical scheme of 'stator core of independent module + stator yoke disc + concentrated coil winding' is combined with the existing production technical conditions, the efficient low-cost batch production of the stator component is achieved, and the initial cost of the hub motor is equal to that of the hub motor in the prior art.

Therefore, the invention provides the following scheme:

the invention discloses an axial magnetic field hub motor, which comprises a motor and a planetary gear speed reducing mechanism, wherein the motor and the planetary gear speed reducing mechanism are connected with a main shaft in a hub space, the motor drives the hub to rotate through the planetary gear speed reducing mechanism, the motor is an axial magnetic field motor with a single air gap structure and comprises a rotor assembly and a stator assembly, the rotor assembly is rotationally connected with the main shaft through a bearing unit which comprises an angular contact ball bearing and is provided with parallel rolling bodies, the stator assembly comprises a plurality of stator cores, a plurality of coils, a stator yoke disc and a stator frame, the stator cores are formed by overlapping and connecting a plurality of sheets of silicon steel materials with different widths in the radial direction into a whole, the axial height of the coils is smaller than the axial length of the stator cores, the coils are sleeved at one end of the stator cores, which is close to the rotor assembly, and the stator yoke disc is provided with a plurality, the stator frame is provided with a radial tray, one end of the stator core inserted into the first mortise and not sleeved with the coil exceeds the stator yoke disc and is connected with the radial tray, or the stator yoke disc is connected with the stator core inserted into the first mortise and is connected with the radial tray, and the stator frame is fixedly connected with the main shaft.

Preferably, the bearing unit is a double-row angular contact ball bearing, or a series combination of a deep groove ball bearing and a single-row angular contact ball bearing, or a series combination of two single-row angular contact ball bearings.

Preferably, the stator yoke disc is made of high-permeability material, and is formed by overlapping a plurality of disc sheets made of silicon steel material along the axial direction, or is made of SMC composite soft magnetic material through mould pressing and sintering.

Preferably, the stator core is formed into an integral structure through a laminating welding process, the welding surface of the stator core at least comprises an end surface of one end of the stator core far away from the rotor assembly, and the stator core is connected with the stator yoke disc or the stator yoke disc and the stator frame in a tenon-and-mortise structure mode.

Preferably, the axial height of the coil is smaller than the axial length of the stator core, and the coil and the stator core are insulated and isolated through an insulated coil framework or by coating an insulating material on the stator core.

Preferably, stator core is keeping away from one side of rotor subassembly with rotor subassembly rotating surface looks vertically two radial superimposed surfaces go up and are equipped with a second tongue-and-groove at least, the second tongue-and-groove is "U" shape groove, stator frame radial tray setting is keeping away from one side of rotor subassembly, be equipped with on the radial tray with the third tongue-and-groove that first tongue-and-groove corresponds, first tongue-and-groove with the third tongue-and-groove is the open slot, stator core is located the interval entity part radial insertion of second tongue-and-groove first tongue-and-groove and third tongue-and-groove, the second tongue-and-groove is interior to be held first tongue-and-groove with the groove limit of third tongue-and-groove, thereby make stator core with stator yoke dish with the stator frame forms the mortise-and-tenon joint structure.

Preferably, the stator core is provided with at least one second tongue-and-groove on two radial superposed surfaces perpendicular to the rotating surface of the rotor assembly on the side far away from the rotor assembly, the second tongue-and-groove is a 'U' -shaped groove, the first tongue-and-groove of the stator yoke disc is an open groove, a plurality of first connecting holes are also arranged on the side close to the shaft, the radial tray of the stator frame is arranged on the side close to the rotor component, the radial tray is provided with a second connecting hole corresponding to the first connecting hole, the stator yoke disc and the stator frame are riveted or bolted through the first connecting hole and the second connecting hole, the solid part of the stator core positioned in the second mortise interval is radially inserted into the first mortise, the second mortise is clamped with the groove edge of the first mortise, so that the stator core and the stator yoke disc are connected in a mortise-tenon joint structure.

Preferably, the stator core is provided with at least one second tongue-and-groove on two radial superposed surfaces perpendicular to the rotating surface of the rotor assembly on the side far away from the rotor assembly, the second tongue-and-groove is an L-shaped groove, a plurality of first connecting holes are also arranged on the side close to the shaft of the stator yoke disc, the radial tray of the stator frame is arranged at one side close to the rotor component, a second connecting hole corresponding to the first connecting hole is arranged on the radial tray, the stator yoke disc and the stator frame are riveted or bolted through the first connection hole and the second connection hole, the solid part of the stator core positioned in the second mortise interval is inserted into the first mortise, therefore, the stator core and the stator yoke disc are connected in a mortise and tenon structure, and then the stator core and the stator yoke disc are fixedly connected in a welding or riveting mode.

Preferably, a plurality of first connecting holes are formed in the side, close to the shaft, of the stator yoke disc, the radial tray of the stator frame is arranged on the side close to the rotor assembly, second connecting holes corresponding to the first connecting holes are formed in the radial tray, the stator yoke disc and the stator frame are riveted or bolted through the first connecting holes and the second connecting holes, one end, which is not sleeved with the coil, of the stator core is inserted into the first mortise, so that the stator core and the stator yoke disc are connected in a mortise-tenon structure, and then the stator core and the stator yoke disc are fixedly connected in a welding or riveting mode.

Compared with the prior art, the invention has the following technical effects:

by adopting the axial magnetic field hub motor, the comparison test is carried out on different types of electric bicycles with different wheel diameters, different tire widths, different vehicle types and different vehicle weights, different solid tires, different pneumatic tires and the like, and the continuous mileage is increased by 25-50% compared with that of the electric bicycle in the prior art; the stator core can be processed by a high-speed continuous die stamping process, the manufacturing cost of the stator core is only 35% of that of the stator core with an integral structure manufactured by a continuous slot punching and winding process, the synchronous research and development of automatic equipment of a sorting, laminating and welding process of the stator core stamping are benefited, the centralized coil winding is produced by the conventional automatic winding process, the consumption of three main materials of a permanent magnet, a silicon steel sheet and an enameled copper wire of the motor is reduced to different degrees, and the initial cost is close to the cost of a hub motor in the prior art; the invention discloses an axial magnetic field motor with an iron core and a single air gap structure, which is combined with a planetary gear speed reducing mechanism and a bicycle hub, and creatively realizes the practical application of the axial magnetic field motor in the field of hub motors.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is an axial layout view of an axial magnetic field hub motor in a hub space according to the present embodiment;

fig. 2 is a schematic structural diagram of a stator assembly of the axial magnetic field hub motor according to the embodiment;

FIG. 3 is a schematic structural view of a bearing unit;

FIG. 4 is a schematic view of another bearing unit;

FIG. 5 is a schematic view of a stator core structure;

FIG. 6 is a schematic view of the connection of a stator core, a stator yoke disc and a stator frame;

fig. 7 is a schematic view of the connection of a stator core, an alternative stator yoke disc and an alternative stator frame.

Description of reference numerals: 1, a main shaft; 2, a hub; 3 a planetary gear reduction mechanism; 4 a rotor assembly; 5, a stator component; 6 rolling bodies; 7 a stator core; 8 coils; 9 a stator yoke disc; 10 a stator frame; 11, welding surfaces; 12 a first mortise; 13 a radial tray; 14 double-row angular contact ball bearings; 15 deep groove ball bearings; 16 single-row angular contact ball bearings; 17 pole shoes; 18 a coil former; 19 a second mortise; 20 a third mortise; 21 a first connection hole; 22 second attachment hole.

Detailed Description

The technical solution of the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiment of the present invention, and the connection and installation scheme of the geared hub motor of the electric bicycle according to the present invention will be properly described to help the understanding of the technical solution of the present invention.

As shown in fig. 1 to 7, the axial magnetic field hub motor of the present embodiment includes a motor and a planetary gear reduction mechanism 3 connected to a main shaft 1 in a space of a hub 2, the motor drives the hub 2 to rotate through the planetary gear reduction mechanism 3, the motor is an axial magnetic field motor with a single air gap structure, and includes a rotor assembly 4 and a stator assembly 5, the rotor assembly 4 is rotatably connected to the main shaft 1 through a bearing unit with parallel rolling bodies 6 including angular contact ball bearings, the stator assembly 5 includes a plurality of stator cores 7, a plurality of coils 8, a stator yoke 9 and a stator frame 10, the stator cores 7 are a plurality of sheets of silicon steel materials with different widths, which are stacked and welded together in a radial direction, and a welding surface 11 of the stator cores includes at least an end surface far from one end of the rotor assembly 4, an axial height of the coils 8 is smaller than an axial length of the stator cores 7, the coil 8 is sleeved at one end of the stator core 7 close to the rotor assembly 4, the stator yoke disc 9 is made of a high-permeability material, the stator yoke disc is formed by overlapping a plurality of silicon steel material disc sheets along the axial direction, or is made of SMC composite soft magnetic materials through mould pressing and sintering, the stator yoke disc 9 is provided with a plurality of circumferentially arrayed first mortises 12, the stator frame 10 is provided with a radial tray 13, one end of the stator core 7, inserted into the first mortises 12, of the coil 8 which is not sleeved with the stator yoke disc 9 is beyond the stator yoke disc 9 and is connected with the radial tray 13, or the stator yoke disc 9 is connected with the stator core 7 inserted into the first mortises 12 and is connected with the radial tray 13, and the stator frame 10 is fixedly connected with the main.

According to the invention with the scheme, the space in the hub is utilized compactly and reasonably, the hub motor has a stable structure with the characteristic of a through shaft, and the disc type rotor assembly 4 has a special pumping effect, so that circulating air flow can be generated in the space of the hub, and the cooling of the motor is facilitated.

The skilled person can select the specific form of the bearing unit according to actual needs, as long as the bearing unit comprises an angular contact ball bearing capable of bearing axial magnetic pull, and the bearing unit has parallel rolling bodies 6 bearing overturning moment. For example, the bearing unit may be a double row angular contact ball bearing 14, as shown in fig. 3, or a series combination of a deep groove ball bearing 15 and a single row angular contact ball bearing 16, as shown in fig. 1, 4, or a series combination of two single row angular contact ball bearings 16 arranged in the same direction.

As shown in fig. 2 and 5, in order to weaken the cogging effect of the axial field motor with a single air gap structure, one end of the stator core 7 close to the rotor assembly 4 is provided with a pole shoe 17, the coil 8 is in a concentrated winding form, the axial height of the coil is smaller than the axial length of the stator core 7, the coil is sleeved between the pole shoe 17 and the stator yoke disc 9, the coil 8 and the stator core 7 are insulated and isolated through an insulated coil framework 18 or insulating materials are coated on the stator core 7, and the plurality of stator cores 7 are coaxially and circumferentially arranged to form an annular armature magnetic pole plane consisting of a plurality of stator core magnetic poles.

The factors influencing the magnetic tension of the axial magnetic field motor are more, and therefore, according to the magnitude of the magnetic tension and the electromagnetic torque, a proper structural form is adopted to ensure the stability of the stator structure, and the connection mode of the stator core 7, the stator yoke disc 8 and the stator frame 9 is adopted.