Axial flux motor

Abstract

This invention provides an axial flux motor, comprising a stator, a rotor, a motor shaft, a radial bearing, and an end-face bearing. The rotor is mounted and fixed to the motor shaft, and the radial bearing is sleeved and fixed to the motor shaft. The motor shaft is mounted to the stator via the radial bearing. The end-face bearing is located between the stator and the rotor, with its two sides abutting against the end faces of the stator and the rotor, respectively. Magnetic and ferrous materials possess natural attraction, generating an axial force between the rotor and stator. By placing the end-face bearing between the stator and rotor, the axial force between them can be counteracted, and the radial bearing and motor shaft can be positioned axially. This creates a uniform air gap between the stator and rotor, and the radial bearing only bears radial load, preventing axial force from being transmitted to it, thus significantly extending its lifespan.

Description

Technical Field

[0001] This utility model relates to an axial flux motor. Background Technology

[0002] In a single-stator, single-rotor axial flux motor, the magnets and core are aligned, the rotor is mounted on the motor shaft, and the motor shaft is mounted on the stator via radial bearings. This type of motor exhibits axial magnetic pull. The presence of this axial magnetic pull accelerates the wear of the radial bearings or causes uneven air gaps between the stator and rotor, resulting in vibration and noise. Therefore, how to counteract the axial magnetic pull to extend the motor's service life is a key focus for R&D designers. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide an axial flux motor.

[0004] The present invention solves the above-mentioned technical problems through the following technical solution:

[0005] An axial flux motor includes a stator, a rotor, a motor shaft, a radial bearing, and an end face bearing. The rotor is mounted and fixed to the motor shaft, the radial bearing is sleeved and fixed to the motor shaft, the motor shaft is mounted to the stator via the radial bearing, and the end face bearing is located between the stator and the rotor, with its two sides abutting against the end face of the stator and the end face of the rotor, respectively.

[0006] In this solution, there is an air gap between the existing motor shaft and the radial bearing. Due to the uniformity and tolerance of the magnetic steel material, the rotor will tilt relative to the motor shaft, resulting in an uneven air gap. At the same time, the magnetic steel material and the ferrous material have natural attraction, which will generate an axial force between the rotor and the stator. By setting an end face bearing between the stator and the rotor, the axial force between the stator and the rotor can be offset, and the radial bearing and the motor shaft can be positioned in the axial direction. This results in a uniform air gap between the stator and the rotor, and the radial bearing only bears the radial load. The axial force is no longer transmitted to the radial bearing, which greatly extends the life of the radial bearing.

[0007] Preferably, the stator includes a stator base, the end face of the stator base having a mounting hole extending through the axial direction of the motor shaft, the inner diameter of the mounting hole being larger than the outer diameter of the motor shaft, the end face of the stator base having a mounting groove, the mounting hole being located in the middle of the mounting groove, the motor shaft passing through the mounting hole, and the radial bearing being embedded and fixed in the mounting groove.

[0008] In this design, the mounting slot of the stator housing secures the radial bearing, and the motor shaft is mounted on the stator housing via the radial bearing. The motor shaft passes through the mounting hole; since the inner diameter of the mounting hole is larger than the outer diameter of the motor shaft, the motor shaft will not contact the inner wall of the mounting hole when rotating, facilitating the rotation of the motor shaft.

[0009] Preferably, there are two radial bearings, which are spaced apart along the length of the motor shaft, and the motor shaft is mounted on the stator housing via the two radial bearings.

[0010] In this design, the above-mentioned structural configuration facilitates the balancing of the radial forces on the motor shaft, thereby improving the stability of the motor shaft during rotation.

[0011] Preferably, there are two mounting slots, which are respectively disposed on the two end faces of the stator seat. The two radial bearings are respectively embedded and fixed in the two mounting slots. A limiting part is formed between the two mounting slots. The two sides of the limiting part abut against the two radial bearings respectively. The mounting hole passes through the limiting part.

[0012] In this design, two mounting slots are used to install and fix two radial bearings respectively, and a limiting part is used to separate the two radial bearings. The limiting part can also limit the two radial bearings to prevent them from moving in the axial direction. The mounting hole passes through the limiting part, forming a channel on the limiting part, which facilitates the motor shaft to pass through and connect with the radial bearing on the other side.

[0013] Preferably, a groove is provided around the outer circumference of one end of the motor shaft, and the axial flux motor further includes a limiting snap ring, which is engaged in the groove and abuts against the outer side of the radial bearing away from the rotor.

[0014] In this design, a retaining circlip limits and fixes the outer radial bearing. The limiting part, combined with the retaining circlip's function, prevents the motor shaft from being pulled out of the stator. The retaining circlip's placement in a groove facilitates installation and disassembly.

[0015] Preferably, the end face bearing is located at the outer edge of the stator and the rotor.

[0016] In this scheme, the above-mentioned structural configuration is adopted to leave enough space in the middle of the stator and rotor to arrange other components, such as permanent magnets and coils, and also to make the axial flux motor structure compact.

[0017] In other alternative solutions, the end face bearings can be positioned near the center of the stator and rotor, with the coils and permanent magnets arranged around the end face bearings.

[0018] Preferably, the stator includes winding units and a stator base, a plurality of winding units are arranged along the circumferential direction of the stator base and installed on the stator base, the end face bearing is arranged around the winding units, and the winding units include a stator core and winding coils sleeved around the stator core.

[0019] In this scheme, when the winding coil is energized, a magnetic pole is formed on the iron core. This magnetic pole interacts with the permanent magnet on the rotor to generate magnetic force, thereby driving the rotor and motor shaft to rotate.

[0020] Preferably, a heat dissipation hole is provided on the end face of the stator base, and the heat dissipation hole is used to connect the cavity where the winding coil is located to the outside.

[0021] In this design, the winding coil generates heat during operation, which can be dissipated through the heat dissipation holes, extending the service life of the flux motor.

[0022] Preferably, a limiting step is provided on the outer edge of the stator base, and the retaining ring of the end face bearing abuts against the limiting step.

[0023] In this design, the retaining ring of the end face bearing is fixed by a limiting step to prevent the end face bearing from shifting and improve the fixing effect.

[0024] Preferably, the rotor includes a rotor base, a rotor back iron, and a magnet. The rotor base has a fixing groove in the middle of its end face. The rotor back iron and the magnet are installed in the fixing groove. An abutment portion is formed around the fixing groove. The retaining ring of the end face bearing abuts against the abutment portion.

[0025] In this design, the fixing slot forms the internal mounting space of the rotor housing, within which the rotor back iron and magnets are installed, resulting in a compact structure. The abutment portion serves both to abut the retaining ring of the end face bearing and to protect the internal rotor back iron and magnets.

[0026] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of this utility model.

[0027] The positive and progressive effects of this utility model are as follows: There is an air gap between the existing motor shaft and radial bearing. Due to the uniformity and tolerance of the magnetic steel material, the rotor will tilt relative to the motor shaft, resulting in an uneven air gap. At the same time, the magnetic steel material and the ferrous material have natural attraction, which will generate an axial force between the rotor and the stator. By setting an end face bearing between the stator and the rotor, the axial force between the stator and the rotor can be offset, and the radial bearing and the motor shaft can be positioned in the axial direction. This results in a uniform air gap between the stator and the rotor, and the radial bearing only bears the radial load. The axial force is no longer transmitted to the radial bearing, which greatly extends the service life of the radial bearing. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of an axial flux motor according to a preferred embodiment of the present invention. Figure 1 .

[0029] Figure 2 This is a schematic diagram of the structure of an axial flux motor according to a preferred embodiment of the present invention. Figure 2 .

[0030] Figure 3 This is a schematic diagram of the structure of an axial flux motor according to a preferred embodiment of the present invention. Figure 3 .

[0031] Figure 4 for Figure 3 Cross-sectional view along line AA.

[0032] Explanation of reference numerals in the attached figures:

[0033] Stator 1

[0034] Mounting hole 11

[0035] Mounting slot 12

[0036] Limiting part 13

[0037] Stator core 14

[0038] Winding coil 15

[0039] Stator 1 set 16

[0040] 161 ventilation holes

[0041] Limiting step 162

[0042] Rotor 2

[0043] Rotor base 21

[0044] Rotor back iron 22

[0045] Magnet 23

[0046] Fixing slot 24

[0047] Butt part 25

[0048] Motor shaft 3

[0049] Groove 31

[0050] Radial bearing 4

[0051] end face bearing 5

[0052] 51-inch ring

[0053] Limiting spring 6

[0054] Radial direction 100

[0055] 200 in the axial direction Detailed Implementation

[0056] The present invention will be described more clearly and completely below with reference to the accompanying drawings, using a preferred embodiment.

[0057] like Figures 1-4 As shown, this embodiment discloses an axial flux motor, which includes a stator 1, a rotor 2, a motor shaft 3, a radial bearing 4, and an end face bearing 5. The rotor 2 is mounted and fixed to the motor shaft 3, and the radial bearing 4 is sleeved and fixed to the motor shaft 3. The motor shaft 3 is mounted to the stator 1 through the radial bearing 4. The end face bearing 5 is located between the stator 1 and the rotor 2, and the two sides of the end face bearing 5 abut against the end face of the stator 1 and the end face of the rotor 2, respectively. There is an air gap between the existing motor shaft 3 and the radial bearing 4. Due to the uniformity of the magnet 23 material and the influence of tolerance, the rotor 2 will tilt relative to the motor shaft 3, resulting in an uneven air gap. At the same time, the magnetic material and the ferrous material have natural attraction, which will generate a force 20° in the axial direction between the rotor 2 and the stator 1. By setting the end face bearing 5 between the stator 1 and the rotor 2, the axial force between the stator 1 and the rotor 2 can be offset, and the radial bearing 4 and the motor shaft 3 can be positioned in the axial direction 20°. This makes a uniform air gap between the stator 1 and the rotor 2, and also makes the radial bearing 4 only bear the radial load. The axial force is no longer transmitted to the radial bearing 4, which greatly extends the life of the radial bearing 4.

[0058] like Figure 1 and Figure 2 As shown, the end face bearing 5 includes two parallel retaining rings 51 and rolling elements between the two parallel retaining rings 51. During installation, the two retaining rings 51 abut against the end face of the stator 1 and the end face of the rotor 2, respectively, so that the end face bearing 5 can transmit force along its own axial direction 200.

[0059] like Figure 4 As shown, the end face bearing 5 is located on the outer edge of the stator 1 and the rotor 2, which leaves enough space in the middle of the stator 1 and the rotor 2 to arrange other components, such as permanent magnets and coils, and also makes the axial flux motor structure compact.

[0060] In other alternative embodiments, the end face bearing may be positioned near the center of the stator and rotor, with the coils and permanent magnets positioned around the end face bearing.

[0061] like Figure 4As shown, the stator 1 includes winding units and a stator base 16. Multiple winding units are arranged circumferentially along the stator base 16 and mounted on the stator base 16. End face bearings 5 ​​are arranged around the winding units. Each winding unit includes a stator core 14 and winding coils 15 sleeved around the stator core 14. When the winding coils 15 are energized, magnetic poles are formed on the core. These magnetic poles interact with the permanent magnets (magnets 23) on the rotor 2 to generate magnetic force, thereby driving the rotor 2 and the motor shaft 3 to rotate.

[0062] like Figure 1 and Figure 4 As shown, a heat dissipation hole 161 is provided on the end face of the stator base 16. The heat dissipation hole 161 is used to connect the cavity where the winding coil 15 is located to the outside. Since the winding coil 15 generates heat when it is working, the heat can be dissipated through the heat dissipation hole 161, thus extending the service life of the flux motor.

[0063] like Figure 4 As shown, a limiting step 162 is provided on the outer edge of the stator base 16, and the retaining ring 51 of the end face bearing 5 abuts against the limiting step 162. The retaining ring 51 of the end face bearing 5 is limited and fixed by the limiting step 162 to prevent the end face bearing 5 from shifting and improve the fixing effect.

[0064] like Figure 4 As shown, the rotor 2 includes a rotor base 21, a rotor back iron 22, and magnets 23. The rotor base 21 has a fixing groove 24 in the center of its end face. The rotor back iron 22 and magnets 23 are mounted in the fixing groove 24. An abutment portion 25 is formed around the fixing groove 24, and the retaining ring 51 of the end face bearing 5 abuts against the abutment portion 25. The fixing groove 24 forms the internal mounting space of the rotor base 21, within which the rotor back iron 22 and magnets 23 are installed, resulting in a compact structure. The abutment portion 25 serves both to abut against the retaining ring 51 of the end face bearing 5 and to protect the internal rotor back iron 22 and magnets 23.

[0065] The rotor base 21 has a mating hole in the middle for mounting the motor shaft 3. The motor shaft 3 is installed in the mating hole, and the motor shaft 3 and the mating hole are installed with an interference fit, so that the motor shaft 3 and the rotor base 21 are firmly fixed. When the rotor base 21 rotates, the rotor base 21 drives the motor shaft 3 to rotate.

[0066] like Figure 4As shown, the end face of the stator base 16 has a mounting hole 11 extending through the motor shaft 3 along the axial direction 200°. The inner diameter of the mounting hole 11 is larger than the outer diameter of the motor shaft 3. The end face of the stator base 16 has a mounting groove 12, with the mounting hole 11 located in the middle of the mounting groove 12. The motor shaft 3 passes through the mounting hole 11, and the radial bearing 4 is embedded and fixed in the mounting groove 12. The mounting groove 12 of the stator base 16 fixes the radial bearing 4, and the motor shaft 3 is mounted on the stator base 16 through the radial bearing 4. Since the inner diameter of the mounting hole 11 is larger than the outer diameter of the motor shaft 3, the motor shaft 3 will not contact the inner wall of the mounting hole 11 when rotating, and therefore will not interfere with the stator base 16, facilitating the rotation of the motor shaft 3.

[0067] like Figure 4 As shown, there are two radial bearings 4, which are spaced apart along the length of the motor shaft 3. The motor shaft 3 is mounted on the stator seat 16 through the two radial bearings 4, which helps to balance the force on the motor shaft 3 in the radial direction 100 and improve the stability of the motor shaft 3 when rotating.

[0068] like Figure 4 As shown, there are two mounting slots 12, which are respectively located on the two end faces of the stator seat 16. Two radial bearings 4 are respectively embedded in and fixed within the two mounting slots 12. A limiting part 13 is formed between the two mounting slots 12, with both sides of the limiting part 13 abutting against the two radial bearings 4. A mounting hole 11 penetrates the limiting part 13. The two mounting slots 12 are used to install and fix the two radial bearings 4 respectively. The limiting part 13 separates the two radial bearings 4 and also limits the movement of the two radial bearings 4 in the axial direction 200. The mounting hole 11 penetrates the limiting part 13, forming a channel in the limiting part 13 to facilitate the passage of the motor shaft 3 and its connection with the radial bearing 4 on the other side.

[0069] like Figure 4 As shown, a groove 31 is provided around the outer circumference of one end of the motor shaft 3. The axial flux motor also includes a limiting spring 6, which is engaged in the groove 31 and abuts against the outer side of the radial bearing 4 away from the rotor 2. The limiting spring 6 limits and fixes the outer radial bearing 4. By limiting the outer radial bearing 4 through the limiting part 13, and in combination with the limiting spring 6, the motor shaft 3 cannot be pulled out from the stator seat 16. The method of fixing by the limiting spring 6 in the groove 31 facilitates the installation and removal of the limiting spring 6.

[0070] In the description herein, it should be understood that the terms "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0071] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. An axial flux electric machine, characterized by, The axial flux motor includes a stator, a rotor, a motor shaft, a radial bearing, and an end face bearing. The rotor is mounted and fixed to the motor shaft, the radial bearing is sleeved and fixed to the motor shaft, the motor shaft is mounted to the stator through the radial bearing, and the end face bearing is located between the stator and the rotor. The two sides of the end face bearing abut against the end face of the stator and the end face of the rotor, respectively.

2. The axial flux motor of claim 1, wherein, The stator includes a stator base, the end face of which has a mounting hole extending through the axial direction of the motor shaft. The inner diameter of the mounting hole is larger than the outer diameter of the motor shaft. The end face of the stator base has a mounting groove, the mounting hole being located in the middle of the mounting groove. The motor shaft passes through the mounting hole, and the radial bearing is embedded and fixed in the mounting groove.

3. The axial flux motor as described in claim 2, characterized in that, The number of radial bearings is two, and the two radial bearings are spaced apart along the length direction of the motor shaft. The motor shaft is mounted on the stator seat through the two radial bearings.

4. The axial flux motor as described in claim 3, characterized in that, The number of mounting slots is two, and the two mounting slots are respectively disposed on the two end faces of the stator seat. The two radial bearings are respectively embedded and fixed in the two mounting slots. A limiting part is formed between the two mounting slots. The two sides of the limiting part abut against the two radial bearings respectively. The mounting hole passes through the limiting part.

5. The axial flux motor as described in claim 4, characterized in that, A groove is provided around the outer circumference of one end of the motor shaft. The axial flux motor also includes a limiting snap ring, which is engaged in the groove and abuts against the outer side of the radial bearing away from the rotor.

6. The axial flux motor as described in claim 1, characterized in that, The end face bearing is located at the outer edge of the stator and the rotor.

7. The axial flux motor as described in claim 6, characterized in that, The stator includes winding units and a stator base. A plurality of winding units are arranged along the circumferential direction of the stator base and installed on the stator base. The end face bearing is arranged around the winding units. The winding unit includes a stator core and winding coils sleeved around the stator core.

8. The axial flux motor as described in claim 7, characterized in that, The stator base has heat dissipation holes on its end face, which are used to connect the cavity containing the winding coil to the outside.

9. The axial flux motor as described in claim 7, characterized in that, The outer edge of the stator base is provided with a limiting step, and the retaining ring of the end face bearing abuts against the limiting step.

10. The axial flux motor as described in claim 6, characterized in that, The rotor includes a rotor base, a rotor back iron, and a magnet. The rotor base has a fixing groove in the middle of its end face. The rotor back iron and the magnet are installed in the fixing groove. An abutment portion is formed around the fixing groove. The retaining ring of the end face bearing abuts against the abutment portion.

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