Ultrathin axial magnetic field motor

Abstract

The utility model discloses an ultrathin axial magnetic field motor, which comprises a base plate, a stator fixed on the base plate, a rotor arranged at an interval with the stator in the axial direction, a core shaft coaxially arranged with the stator, and a bearing sleeved on the outer side surface of the core shaft, the stator comprises a plurality of iron cores and coils, and the rotor comprises a turntable and a plurality of magnets positioned above the iron cores; the number of the magnets is N1, the number of the iron cores is N2, and N1: N2 ranges from 10: 15 to 15: 20; the core shaft comprises a first core shaft and a second core shaft, the lower tail end of the first core shaft and the upper tail end of the second core shaft are coaxially assembled and connected, and the upper tail end of the first core shaft and the rotating shaft are coaxially assembled or integrally formed; the lower tail end of the first mandrel and the lower tail end of the second mandrel are provided with a first positioning step and a second positioning step respectively, and the first positioning step and the second positioning step abut against the inner ring upper end face and the inner ring lower end face of the bearing respectively. The core shaft adopts a split structure, so that the assembly between the core shaft and the bearing is facilitated, the dynamic balance adjustment of the rotor is also facilitated, and the advantages of convenience in assembly, high assembly precision and the like are achieved.

Description

Technical Field

[0001] The utility model relates to the field of motors, in particular to an ultra-thin axial magnetic field motor. Background Art

[0002] The air gap of the axial magnetic field motor is planar, including: a stator fixed on a base plate and a rotor covered on the stator and connected to the stator by a core shaft so as to be rotatable relative to the stator, forming a planar air gap between the rotor and the stator. The core shaft is rotatably connected to the base plate through a bearing, and the core shaft needs to be coaxially assembled with the stator. However, the existing technology has an unreasonable assembly structure of the core shaft and the bearing, which leads to deviations when assembling the core shaft and the bearing, thereby affecting the motor performance and assembly efficiency. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art and provides an ultra-thin axial magnetic field motor with reasonable structure and convenient assembly.

[0004] The utility model provides an ultra-thin axial magnetic field motor, comprising a substrate 11, a stator 2 fixed on the substrate 11, a rotor 3 arranged axially spaced from the stator 2, a core shaft 4 coaxially arranged with the stator 2, and a bearing 5 sleeved on the outer side of the core shaft 4; the stator 2 comprises a plurality of iron cores 21 evenly spaced and distributed on the circumference of the core shaft 4 and a coil 22 correspondingly wound on the iron core 21, the rotor 3 comprises a turntable 31 and a plurality of magnets 33 evenly spaced and fixed on the lower side of the turntable 31 and located above the iron core 21, the number of the magnets 33 is N1, and the number of the iron cores 21 is N2. , N1:N2 is between 10:15 and 15:20; the spindle 4 includes a first spindle 41 and a second spindle 42, the lower end of the first spindle 41 and the upper end of the second spindle 42 are coaxially assembled and connected, the upper end of the first spindle 41 is coaxially assembled and connected with the turntable 31 or is an integrally formed structure; the lower end of the first spindle 41 and the lower end of the second spindle 42 respectively have a first positioning step 411 and a second positioning step 421, the first positioning step 411 and the second positioning step 421 are respectively abutted against the upper end face and the lower end face of the inner ring of the bearing 5.

[0005] In some preferred embodiments, a shell 12 is further provided on the substrate 11 . The shell 12 is arranged on the outer periphery of the stator 2 . The shell 12 has a plurality of receiving grooves 121 evenly spaced apart. Each iron core 21 of the stator 2 is fixed in a receiving groove 121 .

[0006] In some preferred embodiments, N1 is 12 and N2 is 15.

[0007] In some preferred embodiments, counterweight positions 311 are reserved at different positions of the turntable 31 or in the gaps between adjacent magnets 33 .

[0008] In some preferred embodiments, the counterweight position 311 is a screw hole; and a counterweight block adapted to the counterweight position 311 is also included.

[0009] In some preferred embodiments, the rotor 3 further includes a gasket 32 ​​, a limiting groove 312 is provided on the lower side of the turntable 31 , the gasket 32 ​​is fixed in the limiting groove 312 , and a plurality of magnets 33 are fixed on the gasket 32 ​​.

[0010] In some preferred embodiments, a avoidance cavity 7 is provided between the substrate 11 and the lower end of the second core shaft 42 , and a circular grating code disk 8 and a reader are provided in the avoidance cavity 7 . The circular grating code disk 8 is fixed on the lower end surface of the second core shaft 42 , and the reader is fixed on the substrate 11 .

[0011] In some preferred embodiments, the ultra-thin axial magnetic field motor also includes a connecting component for limiting the assembly of the bearing 5, and the connecting component includes at least a first connecting member 61 fixed on the substrate 11, and the upper end of the first connecting member 61 has a supporting step 611, and the support step 611 abuts against the bottom end face of the outer ring of the bearing 5.

[0012] In some preferred embodiments, the connecting assembly also includes a second connecting member 62, which abuts against the outer side surface of the bearing 5 to limit the radial displacement of the bearing 5 relative to the core shaft 4; the lower end of the second connecting member 62 has a downward pressing step 621, which is pressed on the upper end surface of the outer ring of the bearing 5.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] 1. The core shaft 4 is designed as a split structure. When the core shaft 4 and the bearing 5 are assembled, it is only necessary to place the ends of the first core shaft 41 and the second core shaft 42 on the inner ring of the bearing 5 respectively, and the first positioning step 411 and the second positioning step 421 cooperate with each other to limit the assembly of the bearing 5, thereby facilitating the assembly of the core shaft 4 and the bearing 5, and helping to reduce the assembly deviation between the core shaft 4 and the bearing 5, thereby improving the assembly accuracy of the motor.

[0015] 2. The core shaft 4 is designed as a split structure, which is also convenient for dynamic balancing adjustment of the rotor before assembling the motor. It is only necessary to perform dynamic balancing adjustment on the rotor 3 and the first core shaft 41, without the need to use a dummy shaft as in the prior art. This can not only improve the adjustment accuracy, but also avoid assembly deviation caused by disassembly after dynamic balancing adjustment of the rotor 3 using a dummy shaft, so that the ultra-thin axial magnetic field motor can be assembled at one time, which is beneficial to improving assembly efficiency.

[0016] 3. The slot-to-pole ratio of the motor is optimized to give the motor better overall performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural schematic diagram of the ultra-thin axial magnetic field motor of the utility model.

[0018] Figure 2 It is a schematic diagram of the exploded structure of the rotor.

[0019] Figure 3 It is a schematic diagram of the structure of the shell.

[0020] Figure 4 It is a schematic diagram of the internal structure of the ultra-thin axial magnetic field motor of the utility model. DETAILED DESCRIPTION

[0021] In order to further explain the technical means and effects adopted by the present application to achieve the predetermined purpose, the specific implementation methods, structures, features and effects of the present application are described in detail below in conjunction with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures, or characteristics in one or more embodiments may be combined in any suitable form.

[0022] Combination Figure 1-Figure 4 As shown, the utility model discloses an ultra-thin axial magnetic field motor (referred to as "motor"), including a substrate 11, a stator 2 fixed on the substrate 11, a rotor 3 axially spaced from the stator 2, a core shaft 4 coaxially arranged with the stator 2, and a bearing 5 sleeved on the outer side of the core shaft 4, so that the core shaft 4 can rotate relative to the substrate 11 according to the bearing 5; the core shaft 4 includes a first core shaft 41 and a second core shaft 42, one end of the first core shaft 41 and one end of the second core shaft 42 are coaxially assembled and connected, and the first core shaft 41 is coaxially assembled and connected with the rotor 3 or is an integrally formed structure.

[0023] The lower end of the first core shaft 41 and the lower end of the second core shaft 42 have a first positioning step 411 and a second positioning step 421 respectively; the lower end of the first core shaft 41 is located at the upper part of the inner ring of the bearing 5, and the first positioning step 411 abuts against the upper end surface of the inner ring of the bearing 5; the lower end of the second core shaft 42 is located at the lower part of the inner ring of the bearing 5, and the second positioning step 421 abuts against the lower end surface of the inner ring of the bearing 5 to provide support for the inner ring of the bearing 5 from bottom to top through the second positioning step 421.

[0024] The first positioning step 411 and the second positioning step 421 cooperate with each other to provide positioning for the bearing 5 sleeved on the core shaft 4, so that the bearing 5 is axially limited between the first positioning step 411 and the second positioning step 421. It can be seen that by designing the core shaft 4 as a split structure, the core shaft 4 includes the first core shaft 41 and the second core shaft 42 assembled coaxially. During assembly, it is only necessary to insert the lower end of the first core shaft 41 into the inner ring of the bearing 5 from top to bottom, and insert the upper end of the second core shaft 42 into the inner ring of the bearing 5 from bottom to top, and the first positioning step 411 and the second positioning step 421 cooperate with each other to limit the assembly of the bearing 5, which facilitates the assembly of the core shaft 4 and the bearing 5, and can also reduce the assembly deviation between the core shaft 4 and the bearing 5, which is conducive to improving the assembly accuracy of the motor.

[0025] The coaxial assembly connection may be connected by screw connection, interference connection, key connection, pin connection, coupling connection, etc., which are not limited here. For example, in the illustrated structure, the first mandrel 41 and the rotor 3 are an integrally formed structure, and the first mandrel 41 and the second mandrel 42 are screwed together and assembled by a plurality of first screws 91.

[0026] The rotor 3 includes a rotating disk 31 and a plurality of magnets 33 evenly spaced and fixed on the lower side of the rotating disk 31. The magnets 33 are located directly above the iron core 21, with a reserved air gap between the two. The number of magnets 33 is N1, and the number of iron cores 21 is N2. N1:N2 represents the slot-to-pole ratio of the motor, which is between 10:15 and 15:20, so that the motor has better overall performance.

[0027] For example, in the illustrated embodiment, the number of magnets 33 is 12, and the number of iron cores 21 is 15. This is an example and is not intended to be limiting.

[0028] The first core shaft 41 is coaxially assembled and connected with the rotor 3 or is an integrally formed structure, which means that the upper end of the first core shaft 41 is coaxially assembled and connected with the center of the turntable 31 or is an integrally formed structure.

[0029] In addition, when assembling the ultra-thin axial magnetic field motor, if it is necessary to perform dynamic balancing adjustment on the rotor 3 and the first core shaft 41, there is no need to use a dummy shaft as in the prior art. This not only improves the adjustment accuracy, but also avoids the disassembly of the rotor 3 after the dynamic balancing adjustment using the dummy shaft, so that the ultra-thin axial magnetic field motor can be assembled in one go, which has the advantages of convenient assembly and high assembly accuracy.

[0030] For this purpose, counterweight positions 311 are reserved at different positions of the turntable 31. The counterweight positions 311 are usually screw holes. When the rotor 3 and the first spindle 41 are dynamically balanced, counterweight blocks (such as counterweight screws) can be added to the counterweight positions 311 at different positions as needed to achieve counterweight balance, so as to achieve the need for rapid dynamic balance adjustment of the rotor 3 and the first spindle 41. For another example, the counterweight position 311 can also be set in the gap of the magnet 33, and the dynamic balance of the rotor 3 can be easily adjusted by adding counterweight blocks.

[0031] In order to facilitate the fixation of the plurality of magnets 33 to the turntable 31, the rotor 3 also includes a gasket 32. A limiting groove 312 is provided on the lower side of the turntable 31. The gasket 32 ​​is fixed in the limiting groove 312. For example, the turntable 31 and the gasket 32 ​​are fixed by a third screw 93, and the plurality of magnets 33 are fixed to the gasket 32 ​​by bonding, embedding, etc., so that the gasket 33 is used to firmly assemble the plurality of magnets 33 and the turntable 31, so that the magnets 33 will not fall off during the rotation of the rotor 3.

[0032] The ultra-thin axial magnetic field motor can also include a connecting component for limiting the assembly of the bearing 5, and the connecting component includes at least a first connecting member 61. The first connecting member 61 can be fixedly assembled with the base plate 11 by a second screw 92. The upper end of the first connecting member 61 has a supporting step 611, and the supporting step 611 abuts against the bottom end face of the outer ring of the bearing 5 to provide support for the bearing 5, so that the assembly of the bearing 5 is more secure.

[0033] Preferably, the connecting assembly further includes a second connecting member 62, which abuts against the outer side surface of the bearing 5 to limit the radial displacement of the bearing 5 relative to the spindle 4, that is, the second connecting member 62 provides radial limit for the bearing 5. In addition, the lower end of the second connecting member 62 has a pressing step 621, which is pressed on the upper end surface of the outer ring of the bearing 5, and the outer ring of the bearing 5 is limited and fixed by the pressing step 621 and the supporting step 611.

[0034] A shell 12 is also provided on the substrate 11. The shell 12 is arranged on the outer periphery of the stator 2. The shell 12 is usually mainly made of insulating rubber. The stator 2 includes a plurality of iron cores 21 and a plurality of coils 22 evenly spaced around the core shaft 4. The coils 22 are correspondingly wound on the iron cores 21. For example, a plurality of evenly spaced receiving grooves 121 are reserved on the periphery of the shell 12. Each iron core 21 wound with a coil 22 is accommodated in a receiving groove 121, and then fixed by pouring glue into the receiving groove 121. Of course, the shell 12 can also be formed by cooling the glue. For example, the stator 2 and the first connecting member 61 are fixed by integrally pouring glue using a mold tool. The shell 12 is formed after the glue is poured and cooled.

[0035] Recombination Figure 4As shown, there is a position avoidance cavity 7 between the substrate 11 and the lower end of the second core shaft 42, and a circular grating code disk 8 and a reader are arranged in the position avoidance cavity 7, and the reader is used to read the rotation angle of the ultra-thin axial magnetic field motor reflected by the circular grating code disk 8. The circular grating code disk 8 is fixed to the lower end surface of the second core shaft 42, and the reader is fixed on the substrate 11.

[0036] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. An ultra-thin axial magnetic field motor, comprising a substrate (11), a stator (2) fixed on the substrate (11), a rotor (3) arranged axially spaced from the stator (2), a core shaft (4) arranged coaxially with the stator (2), and a bearing (5) sleeved on the outer side of the core shaft (4); the stator (2) comprises a plurality of iron cores (21) evenly spaced around the core shaft (4) and corresponding coils (22) wound around the iron cores (21); the rotor (3) comprises a rotating disk (31) and a plurality of magnets (33) evenly spaced and fixed on the lower side of the rotating disk (31) and located above the iron cores (21), characterized in that: The number of magnets (33) is N1, the number of iron cores (21) is N2, and N1:N2 is between 10:15 and 15:20; The mandrel (4) comprises a first mandrel (41) and a second mandrel (42); the lower end of the first mandrel (41) and the upper end of the second mandrel (42) are coaxially assembled and connected; the upper end of the first mandrel (41) and the rotating disk (31) are coaxially assembled and connected or are an integrally formed structure; The lower ends of the first mandrel (41) and the second mandrel (42) respectively have a first positioning step (411) and a second positioning step (421), and the first positioning step (411) and the second positioning step (421) respectively abut against the upper end surface and the lower end surface of the inner ring of the bearing (5).

2. The ultra-thin axial magnetic field motor according to claim 1, characterized in that: A housing (12) is also provided on the base plate (11). The housing (12) is arranged on the outer periphery of the stator (2). The housing (12) has a plurality of accommodating grooves (121) distributed at even intervals. Each iron core (21) of the stator (2) is respectively fixed in one of the accommodating grooves (121).

3. The ultra-thin axial magnetic field motor according to claim 1, characterized in that: N1 is 12 and N2 is 15.

4. The ultra-thin axial magnetic field motor according to claim 1, characterized in that: Counterweight positions (311) are reserved at different positions of the turntable (31) or in gaps between adjacent magnets (33).

5. The ultra-thin axial magnetic field motor according to claim 4, characterized in that: The counterweight position (311) is a screw hole; and a counterweight block adapted to the counterweight position (311) is also included.

6. The ultra-thin axial magnetic field motor according to claim 1, characterized in that: The rotor (3) further comprises a gasket (32). A limiting groove (312) is provided on the lower side of the rotating disk (31). The gasket (32) is fixed in the limiting groove (312). A plurality of magnets (33) are fixed on the gasket (32).

7. The ultra-thin axial magnetic field motor according to claim 1, characterized in that: It also includes a connection assembly for limiting the assembly of the bearing (5), the connection assembly at least including a first connection member (61) fixed on the base plate (11), the upper end of the first connection member (61) having a support step (611), the support step (611) abutting against the bottom end surface of the outer ring of the bearing (5).

8. The ultra-thin axial magnetic field motor according to claim 7, characterized in that: The connecting assembly further comprises a second connecting member (62), the second connecting member (62) abutting against the outer side surface of the bearing (5) to limit the radial displacement of the bearing (5) relative to the core shaft (4); the lower end of the second connecting member (62) comprises a pressing step (621), the pressing step (621) being pressed against the upper end surface of the outer ring of the bearing (5).

9. The ultra-thin axial magnetic field motor according to claim 1, characterized in that: A position avoidance cavity (7) is provided between the base plate (11) and the lower end of the second mandrel (42). A circular grating code disk (8) and a reader are provided in the position avoidance cavity (7). The circular grating code disk (8) is fixed to the lower end surface of the second mandrel (42), and the reader is fixed to the base plate (11).

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