A high performance electric machine

Abstract

The application discloses a high-performance motor, a stator assembly comprises a stator core and a stator holder, the stator holder is fixed between the stator core and a rotating shaft; wherein the stator holder comprises a holder body and a shaft sleeve sleeved on the outer periphery of the rotating shaft, the inner periphery of the holder body is fixedly connected with the shaft sleeve as a whole; the holder body comprises an embedded groove located on the outer periphery, a double-inclined-surface cavity located on the inner periphery and a plane holder body located between the embedded groove and the double-inclined-surface cavity, a reinforcing ring is arranged in the double-inclined-surface cavity and is sleeved on the shaft sleeve, and the reinforcing ring is fixedly connected with the plane holder body; the inner side of the stator core is fixedly embedded in the embedded groove; the application not only realizes the stable mounting effect of the stator core, but also can obviously increase the mounting strength and service life of the stator assembly, and is especially suitable for application in large and medium power motors with multiple winding units.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of motor structure, and particularly relates to a high-performance motor. BACKGROUND

[0002] The applicant's associated company and the applicant have been focusing on researching the field of intelligent driving control of electric vehicles, and have also paid attention to the technical bottleneck, and therefore have established a major core research and development project to solve the problem of large and medium power driving. The research project has made a major breakthrough in 2018, and on September 19, 2018, a plurality of patent applications were collectively submitted, including four invention patent applications, the invention patent application numbers of which are CN201811094616.4, CN201811094626.8, CN201811094649.9 and CN201811097434.2. The plurality of modular intelligent driving systems composed of a plurality of winding units and a plurality of motor driver units that are centrally coordinated and managed and independently operated are mainly proposed to solve the problem of large and medium power driving, which can significantly improve the technical bottleneck of unreliable performance and low cost in the large and medium power market of the current electric vehicles, and can effectively promote the development process of the future electric vehicle market with higher power and higher performance on the premise of low cost.

[0003] With the deep popularization and application of the applicant, it is found that the motor with a plurality of winding units still has room for improvement in strength and heat dissipation, and therefore it is difficult to meet the driving demand of large and medium power for a long time.

[0004] Therefore, the technical team of the applicant has carried out research and development in order to seek technical solutions to improve the above technical problems. SUMMARY

[0005] Therefore, the purpose of the application is to provide a high-performance motor, which not only realizes the stable installation effect of the stator core, but also can significantly increase the installation strength and service life of the stator assembly, and is especially suitable for application in large and medium power motors with a plurality of winding units.

[0006] The technical scheme of the application is as follows:

[0007] A high-performance motor, comprising a stator assembly fixedly connected with a rotating shaft, a hub rotor assembly magnetically coupled to the outer periphery of the stator core, the stator assembly comprising a stator core and a stator holder, the stator holder being fixedly connected between the stator core and the rotating shaft, wherein the stator holder comprises a holder body and a shaft sleeve fixedly sleeved on the outer periphery of the rotating shaft, and the inner periphery of the holder body is fixedly and integrally connected with the shaft sleeve.

[0008] The holder body comprises an embedding groove at the outer periphery, a double-bevel cavity at the inner periphery, and a flat holder body between the embedding groove and the double-bevel cavity, a reinforcing ring is arranged in the double-bevel cavity and fixedly sleeved on the shaft sleeve, and the reinforcing ring is fixedly connected with the flat holder body; and the inner side of the stator core is fixedly embedded in the embedding groove.

[0009] Preferably, the reinforcing ring is flush with the flat holder body.

[0010] Preferably, the outer periphery of the reinforcing ring is fixedly welded with the flat holder body, and the inner periphery is fixedly welded with the shaft sleeve.

[0011] Preferably, the outer diameter of the reinforcing ring ranges from 40 to 100 mm, and the outer diameter of the stator core ranges from 180 to 250 mm.

[0012] Preferably, the depth of the embedding groove ranges from 1 to 6 mm.

[0013] Preferably, the double-bevel cavity comprises a left-bevel ring and a right-bevel ring which are symmetrically distributed relative to the reinforcing ring, and the included angle between the left-bevel ring and the right-bevel ring ranges from 20 to 60 degrees.

[0014] Preferably, the stator core is provided with at least two winding units, and each winding unit is driven and controlled by a motor driver unit.

[0015] Preferably, the power of the high-performance motor ranges from 600 W to 10 KW.

[0016] Preferably, the left and right ends of the hub rotor assembly are respectively fixedly provided with a side cover and a drum brake end cover.

[0017] Preferably, the outer side panel of the side cover and / or the drum brake end cover is provided with a vane combination structure in the form of a windmill.

[0018] In order to meet the installation strength and large torque transmission requirements of medium and high power motors, a special stator holder structure is provided, the stator holder comprises a holder body and a shaft sleeve fixedly sleeved on the outer periphery of the rotating shaft, the holder body is provided with an outer periphery embedding groove for embedding the stator core and a double-bevel cavity structure at the inner periphery, the outer periphery embedding groove and the double-bevel cavity structure are connected through a flat holder body, and a reinforcing ring structure is arranged in the double-bevel cavity and fixedly sleeved on the shaft sleeve and fixedly connected with the flat holder body. This structure not only realizes the stable installation effect of the stator core, but also significantly increases the installation strength and service life of the stator assembly, and is especially suitable for application in medium and high power motors with multiple winding units.

[0019] In order to realize the convenient processing and manufacturing of the stator holder, the application further provides a preferred stator holder, which is composed of a left holder body and a right holder body which are symmetrically distributed left and right. When processing, the middle part of the left holder body and the middle part of the right holder body are pressed to form a pressed connection plane, the outer periphery of the left holder body and the outer periphery of the right holder body are correspondingly matched to form an embedded groove, at the same time, a double-bevel cavity structure is formed between the inner periphery of the left holder body, the inner periphery of the right holder body and the shaft sleeve, and a reinforcing ring is arranged in the double-bevel cavity structure, so as to ensure that the stator holder not only has excellent structural strength, is suitable for transmitting high torque, but also is convenient to process and easy to assemble, and is suitable for large-scale production and application.

[0020] Considering that the medium and high-power motor has higher heat dissipation demand, the application particularly preferably provides a fin combination structure in the form of a windmill on the outer side panel of the side cover and / or the drum brake end cover. When the motor is running at high speed, the fin combination structure in the form of a windmill can provide high-efficiency air convection effect, can obviously improve the heat dissipation performance of the motor, and can also increase the mounting strength of the side cover and / or the drum brake end cover. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a structural schematic diagram of a high-performance motor in the embodiment of the application;

[0022] Figure 2 is Figure 1 is a structural schematic diagram after rotating by another angle;

[0023] Figure 3 is Figure 1 is a structural schematic diagram after rotating by another angle;

[0024] Figure 4 is Figure 1 is a structural schematic diagram after rotating by another angle;

[0025] Figure 5 is Figure 4 is a sectional view in the A-A direction;

[0026] Figure 6 is a partial exploded structural schematic diagram of a high-performance motor in the embodiment of the application;

[0027] Figure 7 is a structural schematic diagram of a rotor assembly and a stator assembly in the embodiment of the application;

[0028] Figure 8 is a structural schematic diagram of a stator holder in the embodiment of the application;

[0029] Figure 9 is a structural schematic diagram of an outer side panel of a side cover in the embodiment of the application;

[0030] Figure 10 is the schematic diagram of the inner side panel structure of the edge cover in the specific embodiment of the present application;

[0031] Figure 11 is the schematic diagram of the structure of the drum brake end cover in the specific embodiment of the present application. Specific embodiment

[0032] The embodiment of the present application discloses a kind of high-performance motor, including the stator assembly of being fixed as a whole with rotating shaft, stator core outer periphery is equipped with the wheel hub rotor assembly being magnetically coupled with it, stator assembly includes stator core and stator holder, stator holder is fixed between stator core and rotating shaft;Wherein, stator holder includes holder body and axle sleeve of fixed sleeve on the outer periphery of rotating shaft, the inner periphery of holder body is fixedly connected as a whole with axle sleeve;Holder body includes embedding groove located at outer periphery, double bevel cavity body located at inner periphery and plane frame body between embedding groove and double bevel cavity body, while reinforcing ring is fixedly connected with plane frame body, reinforcing ring is arranged in double bevel cavity body and fixed sleeve on axle sleeve, the inside of stator core is fixedly embedded in embedding groove.

[0033] In order to enable the personnel in the technical field to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the scope of protection of the present application.

[0034] Embodiment 1: please see Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 And in conjunction with Figure 6 And Figure 7 It is proposed that a kind of high-performance motor in the present embodiment 1, including the stator assembly 2 of being fixed as a whole with rotating shaft 1, the stator core 21 of stator assembly 2 outer periphery is equipped with the wheel hub rotor assembly 3 being magnetically coupled with it, wheel hub rotor assembly 3 The left and right ends of 3 are fixedly installed with edge cover 41 and drum brake end cover 42 respectively. Preferably, stator core 21 is provided with 2 winding units (also can be set according to actual need The number of winding units, the present embodiment does not make any limit to it), each winding unit is driven and controlled by motor driver unit;In the present embodiment, the power of high-performance motor is 600W-10KW, more preferably 1KW-5KW.

[0035] In the embodiment, the stator assembly 2 comprises a stator core 21 and a stator holder 22 fixed between the stator core 21 and the rotating shaft 1; wherein the stator holder 22 comprises a holder body 23 and a shaft sleeve 24 fixedly sleeved on the outer periphery of the rotating shaft 1, and the inner periphery of the holder body 23 is fixedly and integrally connected with the shaft sleeve 24.

[0036] In the embodiment, the holder body 23 comprises an embedding groove 26 located on the outer periphery, a double-bevel cavity 27 located on the inner periphery, and a flat holder body 28 located between the embedding groove 26 and the double-bevel cavity 27; the double-bevel cavity 27 is provided with a reinforcing ring 25 fixedly sleeved on the shaft sleeve 24, and the reinforcing ring 25 is fixedly connected with the flat holder body 28; and the inner side of the stator core 21 is fixedly embedded in the embedding groove 26.

[0037] Preferably, in order to ensure the structural reinforcing effect of the reinforcing ring 25 on the stator holder 22, in the embodiment, the reinforcing ring 25 is flushly distributed with the flat holder body 28; the outer periphery of the reinforcing ring 25 is fixedly welded with the flat holder body 28, and the inner periphery thereof is fixedly welded with the shaft sleeve 24.

[0038] Preferably, in order to further ensure the installation strength and high-torque transmission capacity of the stator core 21, in the embodiment, the outer diameter of the reinforcing ring 25 ranges from 40 mm to 100 mm, and more preferably ranges from 45 mm to 70 mm; and the outer diameter of the stator core 21 ranges from 180 mm to 250 mm, and more preferably ranges from 200 mm to 240 mm.

[0039] Preferably, in order to facilitate the embedding effect of the stator core 21, in the embodiment, the depth of the embedding groove 26 ranges from 1 mm to 6 mm, and more preferably ranges from 2 mm to 4 mm.

[0040] Preferably, please further refer to Figure 5 In order to facilitate the forming effect of the double-bevel cavity 27, in the embodiment, the double-bevel cavity 27 comprises a left-bevel ring 27a and a right-bevel ring 27b which are symmetrically distributed with respect to the reinforcing ring 25, and the included angle between the left-bevel ring 27a and the right-bevel ring 27b ranges from 20° to 60°.

[0041] Example 2: on the basis of the above-mentioned example 1, please further refer to Figure 8 and in combination with Figure 5As shown, the preferred embodiment 2 proposes a stator holder 22, which comprises a left holder body 22a and a right holder body 22b distributed in left-right symmetry, wherein the left holder body 22a comprises an inner circumferential part, an intermediate part and an outer circumferential part connected integrally; the intermediate part of the left holder body 22a and the intermediate part of the right holder body 22b are pressed together to form a pressed connection plane (equivalent to a flat holder body 28); the outer circumferences of the left holder body 22a and the right holder body 22b correspondingly match to form an embedded groove 26; the inner circumferential parts of the left holder body 22a and the right holder body 22b are respectively in the form of an inclined surface, specifically including a left inclined surface ring 27a and a right inclined surface ring 27b, which respectively extend along the pressed connection plane 28 to the corresponding side direction thereof and are fixedly sleeved on the shaft sleeve 24, so that a double-inclined surface cavity 27 is formed between the inner circumferential part of the left holder body 22a, the inner circumferential part of the right holder body 22b and the shaft sleeve 24; an enhanced ring 25 is arranged in the double-inclined surface cavity 27 and is fixedly sleeved on the shaft sleeve 24, and the enhanced ring 25 is fixedly connected with the pressed connection plane 28.

[0042] Preferably, in order to ensure the structural enhancement effect while improving the torque transmission level, in the present embodiment, the enhanced ring 25 is distributed in flush with the pressed connection plane 28, and the pressed connection plane 28 is distributed vertically with the shaft sleeve 24; the outer diameter of the enhanced ring 25 is less than half the outer diameter of the pressed connection plane 28.

[0043] Preferably, in order to ensure the installation strength while facilitating convenient processing and manufacturing, in the present embodiment, the left holder body 22a, the right holder body 22b and the enhanced ring 25 are integrally processed and formed by using ferrous materials respectively; the enhanced ring 25 is fixedly welded with the pressed connection plane 28; at the same time, the left holder body 22a, the right holder body 22b and the enhanced ring 25 are fixedly welded on the shaft sleeve 24 respectively; further preferably, in order to facilitate the welding effect, in the present embodiment, the outer circumference of the shaft sleeve 24 is respectively provided with a left protruding ring 24a and a right protruding ring 24b at intervals; wherein the inner circumferential part of the left holder body 22a is fixedly welded with the left protruding ring 24a, and the inner circumferential part of the right holder body 22b is fixedly welded with the right protruding ring 24b.

[0044] Preferably, in order to further improve the structural strength, in the present embodiment, the included angle between the inner circumferential part of the left holder body 22a and the rotating shaft 1 is in the range of 60-80°; the width of the shaft sleeve 24 is less than the groove width of the embedded groove 26.

[0045] The stator holder 22 provided by the present embodiment not only has excellent structural strength, is suitable for transmitting high torque, but also is convenient to process, easy to assemble and suitable for large-scale production and application.

[0046] Embodiment 3: on the basis of embodiment 1, please further refer to Figure 9 , Figure 10 and combineFigure 11 As shown, the preferred embodiment 3 proposes a motor end cover, which includes a side cover 41 and a drum brake end cover 42. Preferably, in the present embodiment, the end cover outer side panel of the side cover 41 and the drum brake end cover 42 is in a circular shape, which is an integral cast aluminum part.

[0047] In the present embodiment, the end cover outer side panel of the side cover 41 and the drum brake end cover 42 is respectively provided with a shaft hole part 43 for inserting the rotating shaft 1 (wherein the shaft hole part 43 of the drum brake end cover 42 is further provided with a drum brake), and the inner periphery thereof is provided with a windmill-shaped distribution of fin combination structure, which is annularly distributed on the outer periphery of the shaft hole part 43.

[0048] In order to achieve the effect of windmill-shaped distribution of fin combination, in the present embodiment, the fin combination structure includes a plurality of inverted V-shaped fins 44, each fin 44 including a V-end point 44a in the middle and a left end point 44b and a right end point 44c on both sides of the V-end point 44a; the V-end point 44a of a single fin 44 is connected to the left end point 44b or the right end point 44c of its adjacent fin 44, while the right end point 44c or the left end point 44b of the adjacent fin 44 is connected to the shaft hole part 43.

[0049] Preferably, in order to further improve the convective heat dissipation effect, in the present embodiment, each fin 44 includes a first fin unit 441 and a second fin unit 442 connected at the intersection, wherein the outer side of the connection part 443 between the first fin unit 441 and the second fin unit 442 is in an inverted V shape, and the inner side of the connection part 443 is in a circular arc shape; the first fin unit 441 and the second fin unit 442 are symmetrically distributed with respect to the connection part 443; wherein the width of the first fin unit 441 close to the connection part 443 is greater than the width of the first fin unit 441 away from the connection part 443.

[0050] Preferably, in the present embodiment, the number of fins 44 is 5-7; more preferably, in the present embodiment, the number of fins 44 is 6.

[0051] Preferably, in the present embodiment, the outer periphery of the end cover outer side panel is further provided with a plurality of convective enhancement fins 45 distributed at intervals, wherein the number of convective enhancement fins 45 is equal to the number of fins 44, and the convective enhancement fins 45 are connected to the V-end point 44a of its corresponding fin 44; in order to further improve the convective heat dissipation efficiency, preferably, in the present embodiment, the central axis of the convective enhancement fin 45 deviates from the central axis of the end cover outer side panel; at the same time, the width of the convective enhancement fin 45 close to the V-end point 44a is smaller than the width of the convective enhancement fin 45 away from the V-end point 44a.

[0052] Preferably, in order to improve the structural strength of the side cover 41 and the drum brake end cover 42, in the present embodiment, a plurality of reinforcing ribs 46 are arranged between adjacent pairs of flow enhancing ribs 45, the central axis of the reinforcing ribs 46 being offset from the central axis of the outer side panel of the end cover; and more preferably, in the present embodiment, each reinforcing rib 46 is connected to a rib 44.

[0053] Through actual application, when the motor is running at high speed, the windmill-shaped distribution of the rib combination structure can provide an efficient air convection effect, can significantly improve the heat dissipation performance of the motor, and can also increase the mounting strength of the side cover 41 and the drum brake end cover 42.

[0054] It is obvious to those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0055] Furthermore, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. An electric machine comprising a stator assembly fixedly attached to a shaft, the stator assembly having an outer periphery with a hub rotor assembly magnetically coupled thereto, characterized by, The stator assembly comprises a stator core and a stator holder which is fixed between the stator core and the rotating shaft; wherein the stator holder comprises a holder body and a shaft sleeve fixedly sleeved on the outer periphery of the rotating shaft, and the inner periphery of the holder body is fixedly and integrally connected with the shaft sleeve; The holder body comprises an embedded groove on the outer periphery, a double-bevel cavity on the inner periphery, and a flat holder body between the embedded groove and the double-bevel cavity, an enhanced ring is arranged in the double-bevel cavity and fixedly sleeved on the shaft sleeve, and the enhanced ring is fixedly connected with the flat holder body; the inner side of the stator core is fixedly embedded in the embedded groove; The left and right ends of the hub rotor assembly are respectively fixedly provided with a side cover and a drum brake end cover. The outer panel of the side cover and / or the drum brake end cover is provided with a windmill-shaped distributed rib combination structure. The rib combination structure comprises a plurality of inverted V-shaped ribs, each rib comprising a V-end point in the middle and left and right end points on both sides of the V-end point; the V-end point of a single rib is connected with the left end point or the right end point of its adjacent rib, and the right end point or the left end point of the adjacent rib is connected with the shaft hole part; Each rib comprises a first rib unit and a second rib unit intersectingly connected, wherein the outer side of the connection between the first rib unit and the second rib unit is in an inverted V-shaped form, and the inner side of the connection is in a circular arc shape; the first rib unit and the second rib unit are distributed left and right symmetrically relative to the connection; wherein the width of the first rib unit close to the connection is greater than the width of the first rib unit away from the connection; The outer periphery of the outer panel of the end cover is also provided with a plurality of spaced distributed convection enhancing ribs, wherein the number of the convection enhancing ribs is equal to the number of the ribs, and the V-end point of the convection enhancing rib is connected with its corresponding rib; the central axis of the convection enhancing rib deviates from the central axis of the outer panel of the end cover; and the width of the convection enhancing rib close to the V-end point is smaller than the width of the convection enhancing rib away from the V-end point; A plurality of reinforcing ribs are arranged between adjacent convection enhancing ribs, and the central axis of each reinforcing rib deviates from the central axis of the outer panel of the end cover; each reinforcing rib is connected with a rib.

2. The electric machine of claim 1, wherein, The enhanced ring is flush with the flat holder body.

3. The electric machine of claim 1, wherein, The outer periphery of the enhanced ring is fixedly welded with the flat holder body, and the inner periphery thereof is fixedly welded with the shaft sleeve.

4. The electric machine of claim 1, wherein, The outer diameter of the enhanced ring ranges from 40 to 100 mm, and the outer diameter of the stator core ranges from 180 to 250 mm.

5. The electric machine of claim 1 or 4, wherein, The depth of the embedded groove ranges from 1 to 6 mm.

6. The electric machine of claim 1, wherein, The double-bevel cavity comprises a left bevel ring and a right bevel ring which are distributed left and right symmetrically relative to the enhanced ring, and the included angle between the left bevel ring and the right bevel ring ranges from 20 to 60°.

7. The electric machine of claim 1, wherein, The stator core is provided with at least two winding units, and each winding unit is driven and controlled by a motor driver unit.

8. The electric machine of claim 7, wherein, The power of the motor ranges from 600 W to 10 KW.

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