Brushless motor

Abstract

The utility model discloses a brushless motor. The brushless motor comprises a first rotor, a second rotor, a stator, a rotating shaft and a rotor supporting part, the first rotor and the second rotor are arranged in the axial direction of the rotating shaft and are arranged on the periphery of the rotor supporting part in a sleeving mode. The stator is located between the first rotor and the second rotor, and the stator, the first rotor and the second rotor are arranged at intervals; the rotating shaft is fixedly connected with the rotor supporting part; the rotor supporting part can rotate along with the first rotor and the second rotor, and the rotating shaft can rotate along with the rotor supporting part; the first rotor comprises a plurality of permanent magnets and a first magnetic conductive material part, and the second rotor comprises a second magnetic conductive material part; and the first magnetic conductive material part is positioned on one side, far away from the stator, of the permanent magnet. According to the utility model, the requirements of miniaturization of the brushless motor and high efficiency at a high rotating speed can be met.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technical field especially relates to a brushless motor. BACKGROUND

[0002] Electric motor can convert electric energy into mechanical energy, has important application in modern society, and the requirement of electric motor is also higher and higher. For example, in the field such as light field display, need to utilize electric motor to drive display lamp tray rotation. And in these fields, electric motor needs to have the characteristics of miniaturization and high efficiency under high speed.

[0003] However, the electric motor structure in the related art is complex, and cannot meet the needs of miniaturization and high efficiency under high speed. SUMMARY

[0004] The utility model provides a brushless motor to meet the needs of miniaturization and high efficiency under high speed of brushless motor.

[0005] According to an aspect of the utility model, a brushless motor is provided, the brushless motor comprises: a first rotor, a second rotor, a stator, a rotating shaft and a rotor support part;

[0006] The first rotor and the second rotor are arranged along the axial direction of the rotating shaft, and are both sleeved on the periphery of the rotor support part;The stator is located between the first rotor and the second rotor, and the stator is spaced apart from the first rotor and the second rotor;The rotating shaft is fixedly connected with the rotor support part;The rotor support part can rotate with the first rotor and the second rotor, and the rotating shaft can rotate with the rotor support part;

[0007] The first rotor comprises a plurality of permanent magnets and a first magnetic conductive material part, and the second rotor comprises a second magnetic conductive material part;Wherein, the first magnetic conductive material part is located on the side of the permanent magnet away from the stator.

[0008] Optionally, the first rotor further comprises a magnet seat for fixing the plurality of permanent magnets;The magnet seat comprises a plurality of fixing grooves, and the plurality of permanent magnets and the plurality of fixing grooves correspond one by one, and the permanent magnet is located in the fixing groove;The magnet seat is fixedly connected with the rotor support part;The first magnetic conductive material part is located on the side of the magnet seat away from the stator.

[0009] Optionally, the magnet seat and the rotor support part are an integral structure;

[0010] Alternatively, the magnet seat and the rotor support part are independent structures

[0011] Optionally, the first rotor comprises a plurality of rotor bars extending along a radial direction of the first rotor and distributed along a circumferential direction of the first rotor; at least one rotor bar is arranged between two adjacent permanent magnets; two adjacent rotor bars are connected by a first end ring at one end close to the center of the first rotor, and connected by a second end ring at one end away from the center of the first rotor.

[0012] Optionally, the brushless motor further comprises a reinforcing ring coaxially sleeved on the periphery of the first rotor.

[0013] Optionally, the rotor support part is formed with a heat dissipation groove at the bottom of the rotor; a plurality of heat dissipation holes are further arranged on the rotor support part and communicate the heat dissipation groove and the corresponding air gap of the rotor.

[0014] The brushless motor further comprises an impeller arranged in the heat dissipation groove.

[0015] Optionally, the stator comprises a plurality of planar stator coils and a coil carrier plate for carrying the planar stator coils.

[0016] Optionally, the planar stator coil is a coreless flat winding, and a long axis of a line cross section of the planar stator coil is parallel to an axial direction of the stator.

[0017] Optionally, an insulating sheet is arranged between two adjacent planar stator coils.

[0018] Optionally, a plurality of detachable spacers are arranged between the rotor support part and the part connecting the first rotor and the second rotor.

[0019] Optionally, the brushless motor further comprises:

[0020] a stator support part and a bearing;

[0021] The stator support part comprises a bearing fixing part and a base, the bearing is fixed in the bearing fixing part, and the bearing is sleeved on the periphery of the shaft;

[0022] The stator is fixed on the base.

[0023] The technical scheme of the utility model embodiment adopts the brushless motor which comprises a first rotor, a second rotor, a stator, a rotating shaft and a rotor support part, the first rotor and the second rotor are arranged along the axial direction of the rotating shaft and are both sleeved on the periphery of the rotor support part, the stator is located between the first rotor and the second rotor and is spaced apart from the first rotor and the second rotor, the rotating shaft is fixedly connected with the rotor support part, the rotor support part can rotate with the first rotor and the second rotor, and the rotating shaft can rotate with the rotor support part, the first rotor comprises a plurality of permanent magnets and a first magnetic conductive material part, the second rotor comprises a second magnetic conductive material part, and the first magnetic conductive material part is located on the side of the permanent magnet away from the stator. Through the design of the single-sided magnet, the ultra-thin characteristic of the brushless motor can be realized; through the design of the double-layer rotor, the double air gap and the two magnetic conductive material parts, the magnetic field strength between the permanent magnet and the stator is strong, and the magnetic leakage is less, so that the brushless motor still has high efficiency under high rotating speed.

[0024] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the utility model, and is not used to limit the scope of the utility model. Other features of the utility model will become easy to understand through the following description. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the drawings needed in the embodiment description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to these drawings without creative labor for those skilled in the art.

[0026] Figure 1 A structure schematic view of a brushless motor provided by the utility model embodiment is shown in the figure.

[0027] Figure 2 A structure schematic view of a first rotor provided by the utility model embodiment is shown in the figure.

[0028] Figure 3 A structure schematic view of another brushless motor provided by the utility model embodiment is shown in the figure.

[0029] Figure 4 A structure schematic view of another brushless motor provided by the utility model embodiment is shown in the figure.

[0030] Figure 5 A structure schematic view of another first rotor provided by the utility model embodiment is shown in the figure.

[0031] Figure 6 A structure schematic view of another first rotor provided by the utility model embodiment is shown in the figure.

[0032] Figure 7 A structure schematic view of a rotor support part is provided for the embodiment of the utility model.

[0033] Figure 8 A structure schematic view of a stator is provided for the embodiment of the utility model. DETAILED DESCRIPTION

[0034] In order to make the person in the art better understand the utility model scheme, the technical scheme in the embodiment of the utility model will be described clearly and completely below in combination with the drawings in the embodiment of the utility model, and obviously, the described embodiment is only a part of the embodiment of the utility model, rather than all the embodiments. Based on the embodiment in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor should belong to the protection scope of the utility model.

[0035] It should be noted that the terms "first", "second" and the like in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the utility model described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any modification thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to the clearly listed steps or units, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0036] Figure 1 A structure schematic view of a brushless motor is provided for the embodiment of the utility model, referring to Figure 1 The brushless motor comprises a first rotor 11, a second rotor 12, a stator 13, a rotating shaft 14 and a rotor support part 15; the first rotor 11 and the second rotor 12 are arranged along the axial direction X of the rotating shaft 14, and are both sleeved on the periphery of the rotor support part 15; the stator 13 is located between the first rotor 11 and the second rotor 12, and the stator 13 is spaced apart from the first rotor 11 and the second rotor 12; the rotating shaft 14 is fixedly connected with the rotor support part 15; the rotor support part 15 can rotate with the first rotor 11 and the second rotor 12, and the rotating shaft 14 can rotate with the rotor support part 15; the first rotor 11 comprises a plurality of permanent magnets 111 and a first magnetic conductive material part 112, and the second rotor 12 comprises a second magnetic conductive material part; wherein the first magnetic conductive material part 112 is located on the side of the permanent magnet 111 away from the stator 13.

[0037] Specifically, the brushless motor of the present embodiment is an axial flux permanent magnet motor, that is, the stator 13 and the rotor are arranged in parallel in a disc shape, and the magnetic field flows in the axial direction. When the coils in the stator 13 are energized, the stator 13 generates a magnetic field, and the magnetic field generated by the stator 13 interacts with the magnetic field generated by the permanent magnet 111, thereby rotating the rotor. The rotation of the rotor drives the rotation of the rotor support portion 15, and in turn drives the rotation of the rotating shaft 14. In the present embodiment, the rotor of the brushless motor includes two rotors, the first rotor 11 and the second rotor 12, and each rotor is spaced apart from the stator 13, that is, there is an air gap between the first rotor 11 and the stator 13, and there is also an air gap between the second rotor 12 and the stator 13. The brushless motor is designed with double air gaps, which can improve the torque output capability of the brushless motor; in addition, each air gap can serve as a heat dissipation channel, thus also having good heat dissipation capability, and having the characteristics of high efficiency at high speed.

[0038] In addition, in the present embodiment, the first rotor 11 includes a permanent magnet, and the second rotor 12 does not include a permanent magnet, that is, the brushless motor is designed with a single-sided magnet. By setting a single-sided magnet, the brushless motor can achieve an ultra-thin design, which can effectively reduce the volume of the brushless motor and is more conducive to miniaturization. In addition, by setting a single-sided magnet, the first magnetic material portion 112 can be arranged on one side of the permanent magnet, and the second magnetic material portion can be arranged on the other side, and the stator 13 is arranged between the second magnetic material portion and the permanent magnet. The first magnetic material portion 112 and the second magnetic material portion can guide the direction of the magnetic force line, so that the magnetic field generated by the permanent magnet 111 is guided between the permanent magnet 111 and the stator 13. That is, the magnetic field strength between the permanent magnet 111 and the stator 13 is significantly strengthened, and the magnetic flux density is large, so that the magnetic leakage can be effectively reduced, and the efficiency is still high at high speed.

[0039] In addition, it should be noted that the first rotor 11 and the second rotor 12 are sleeved on the periphery of the rotor support portion 15, and the rotor support portion 15 serves to support the first rotor 11 and the second rotor 12. The rotor support portion 15 can ensure that there is always an air gap between the first rotor 11, the second rotor 12 and the stator 13, preventing the two rotors from deforming due to uneven local stress.

[0040] The technical solution of this embodiment uses a brushless motor including a first rotor, a second rotor, a stator, a shaft, and a rotor support. The first and second rotors are arranged axially along the shaft and are both sleeved around the rotor support. The stator is located between the first and second rotors, and is spaced apart from both the first and second rotors. The shaft is fixedly connected to the rotor support. The rotor support can rotate with the first and second rotors, and the shaft can rotate with the rotor support. The first rotor includes multiple permanent magnets and a first magnetically conductive material, and the second rotor includes a second magnetically conductive material. The first magnetically conductive material is located on the side of the permanent magnets away from the stator. The single-sided magnet design achieves the ultra-thin characteristic of the brushless motor. The double-layer rotor, double air gap, and two magnetically conductive material sections result in a strong magnetic field between the permanent magnets and the stator with minimal magnetic leakage, thus maintaining high efficiency even at high speeds.

[0041] Alternatively, in some embodiments, the magnetic material may be silicon steel sheet, superconducting material, magnetic stainless steel, ferrite, rare earth alloy, or permalloy, etc.

[0042] Alternatively, in some embodiments, the rotor support 15 may be made of a non-magnetic material, such as a non-ferrous metal.

[0043] Alternatively, in some implementations, such as Figure 2 As shown, Figure 2 This is a schematic diagram of the structure of a first rotor provided for an embodiment of the present utility model. (Reference) Figure 1 and Figure 2 In this embodiment, the permanent magnet 111 can be a sector magnet, and multiple sector magnets are uniformly fixed on the first magnetically conductive material part 112. The sector magnets can be fixed on the first magnetically conductive material part 112 with adhesive.

[0044] Alternatively, in other embodiments, such as Figures 3 to 5 As shown, where, Figure 3 This is a schematic diagram of the structure of another brushless motor provided in an embodiment of the present invention. Figure 4 This is a schematic diagram of the structure of another brushless motor provided in an embodiment of the present invention. Figure 5 This is a schematic diagram of another first rotor provided in an embodiment of the present invention. The first rotor 11 also includes a magnet base 113, which is used to fix a plurality of permanent magnets 111. The magnet base includes a plurality of fixing slots, and the plurality of permanent magnets correspond one-to-one with the plurality of fixing slots, with the permanent magnets 111 located in the fixing slots; the magnet base 113 is fixedly connected to the rotor support portion 15; the first magnetic conductive material portion 112 is located on the side of the magnet base 113 away from the stator 13.

[0045] Specifically, in the embodiment, the magnet seat 113 can be used to fix the permanent magnet 111, and the shape of the fixing groove matches the shape of the permanent magnet 111. For example, the permanent magnet 111 is cylindrical, and the shape of the fixing groove is also cylindrical. In other embodiments, if the shape of the permanent magnet 111 is other polygons or special shapes, the shape of the fixing groove is also polygonal or special. The magnet seat 113 can be made of plastic or other materials. In the embodiment, the permanent magnet is fixed by the magnet seat, and the brushless motor can be started asynchronously or synchronously.

[0046] Optionally, in some embodiments, as shown in Figure 3 , the magnet seat 113 and the rotor support part 15 are integrated structures. That is, when the rotor support part 15 is made, the magnet seat 113 is integrally made, and the materials of the magnet seat 113 and the rotor support part 15 are the same. In other embodiments, as shown in Figure 4 and Figure 5 , the magnet seat 113 and the rotor support part 15 are independent structures, and at this time, the materials of the magnet seat 113 and the rotor support part 15 can be different, and the magnet seat 113 can be designed according to the shape of the permanent magnet to be fixed, that is, the magnet seat 113 can fix any special-shaped permanent magnet.

[0047] Optionally, Figure 6 is another structure schematic diagram of the first rotor provided by the embodiment of the utility model, referring to Figure 6 . In the embodiment, the first rotor 11 includes a plurality of rotor bars 115, the rotor bars 115 extend along the radial direction of the first rotor 11, and the plurality of rotor bars 115 are distributed along the circumferential direction of the first rotor; at least one rotor bar 115 is spaced between two adjacent permanent magnets 111; one end of two adjacent rotor bars 115 close to the center of the first rotor is connected through a first end ring 116, and one end of two adjacent rotor bars 115 away from the center of the first rotor is connected through a second end ring 117.

[0048] Specifically, in the embodiment, the rotor bar 115, the first end ring 116 and the second end ring 117 are integrated structures. The rotor bar 115 can be a material that is conductive and not magnetic, such as aluminum or copper. By setting the rotor bar 115, the brushless motor can be controlled to start asynchronously, and after starting, it can run synchronously. Since synchronous control is not required during starting, it has the advantages of simple control and low failure rate. In the embodiment, the permanent magnet 111 can be pasted on the first magnetic material part. Of course, the permanent magnet 111 can also be fixed with its two adjacent rotor bars; in the embodiment, the rotor bar 115 can also be understood as a magnet seat with an independent structure with the rotor support part. In addition, one rotor bar, two rotor bars or even more rotor bars can be arranged between two adjacent permanent magnets 111.

[0049] Optionally, with reference to Figures 1 to 6 The brushless motor further comprises a reinforcing ring 21 coaxially sleeved on the periphery of the first rotor 11.

[0050] Specifically, when the first rotor 11 comprises a magnet seat, the reinforcing ring 21 can be sleeved on the periphery of the magnet seat. When the first rotor 11 comprises a rotor bar, the reinforcing ring 21 can be sleeved on the periphery of the second end ring corresponding to the rotor bar. When the first rotor rotates at high speed, the centrifugal force acting on the permanent magnet 111 is large, which can cause displacement. By arranging the reinforcing ring 21, the permanent magnet can be stabilized when the first rotor rotates at high speed, so as to resist the centrifugal force.

[0051] Optionally, in some embodiments, the reinforcing ring 21 can be a carbon fiber material, which has high strength and corrosion resistance, low damage probability, and can better stabilize the permanent magnet.

[0052] Optionally, in some embodiments, as Figure 1 shown, along the axial direction of the rotating shaft 14, the first rotor 11 is located on the side away from the rotating shaft 14 of the second rotor 13. In some other embodiments, the positions of the first rotor 11 and the second rotor 13 can be interchanged, that is, the second rotor 13 is arranged on the side away from the rotating shaft 14 of the first rotor 11.

[0053] Optionally, Figure 7 A structure diagram of a rotor support part provided by the utility model embodiment is shown in FIG. 4. As shown in Figure 1 , Figure 3 , Figure 4 and Figure 7 , the rotor support part 15 is formed with a heat dissipation groove Gap; a plurality of heat dissipation holes 151 are further arranged on the rotor support part 15, and the heat dissipation holes 151 are communicated with the heat dissipation groove Gap and the air gap corresponding to the rotor.

[0054] Specifically, the rotor support part 15 in the embodiment is a hollow columnar structure, and the heat dissipation groove Gap is formed in the inside of the columnar structure. The impeller 16 is arranged in the heat dissipation groove Gap, and when the rotor rotates, the rotor support part 15 is driven to rotate synchronously. The impeller 16 arranged on the rotor support part 15 sucks air through high-speed rotation and discharges the air through the heat dissipation holes 151. In this process, the air flow passes through the surface of the permanent magnet 111, effectively taking away the heat of the permanent magnet 111 through forced convection heat exchange, forming good air circulation and realizing the heat dissipation function of the permanent magnet. In addition, the second rotor can also be cooled. The permanent magnet 111 is easy to demagnetize at high temperature, and the embodiment can reduce the demand for temperature resistance of the permanent magnet by arranging the impeller and the heat dissipation hole, thereby reducing the cost and prolonging the service life of the motor.

[0055] Optionally, Figure 8The structure diagram of the stator provided by the embodiment of the utility model, refer to Figure 8 The stator comprises a plurality of planar stator coils 131 and a coil carrier plate for carrying the planar stator coils 131.

[0056] Specifically, the planar stator coil can be a coreless flat winding, and the long axis of the wire cross section of the planar stator coil is parallel to the axial direction of the stator. The planar stator coil can further reduce the size of the brushless motor in the axial direction, and is more conducive to miniaturization. Moreover, the planar stator coil also has strong heat dissipation capacity. In the embodiment, the long axis of the wire cross section of the planar stator coil is parallel to the axial direction of the stator, the short axis of the conductor (i.e. the coil) is consistent with the direction of change of the magnetic field, the cross-sectional area of the eddy current path is smaller, and the stator eddy current loss can be effectively reduced.

[0057] Optionally, in some embodiments, the coil carrier plate can adopt a PCB (Printed Circuit Board); the coil carrier plate can also adopt aluminum nitride, which can further improve the heat dissipation capacity, thereby effectively increasing the power, and also improving the rigidity of the stator.

[0058] Optionally, continuing to refer to Figure 8 An insulating sheet 132 is arranged between the two adjacent planar stator coils. The insulating sheet 132 can be a high-voltage-resistant insulating sheet, which can protect the planar stator coil from being punctured when subjected to high voltage. For example, the planar stator coil will not be punctured at 3000V high voltage and 20,000 revolutions. It should be noted that the insulating sheet is arranged in a spaced manner with the planar stator coil.

[0059] Optionally, in some embodiments, a plurality of detachable shims are arranged between the part connecting the first rotor 11 and the second rotor 12 of the rotor support part 15. The detachable shims are used to adjust the distance between the first rotor 11 and the second rotor 12, that is, to adjust the size of the air gap between the first rotor 11 and the second rotor 12. More specifically, to ensure maximum motor power, theoretically, the smaller the air gap, the better, however, due to processing errors, rotation balance, errors during installation of the permanent magnet, thickness errors of the permanent magnet, etc., the air gap between the rotor and the stator at different positions is not uniform, which will cause collision during rotation. The embodiment ensures that the rotor and the stator will not collide during movement by arranging the detachable shims. In addition, the size of the air gap required is different in different applications, and the size of the air gap can be adjusted by the detachable shims, so that the motor can be applied to different scenes, and the flexibility is higher. Exemplarily, the shims can adopt a magnetically conductive and electrically non-conductive material such as a silicon steel sheet.

[0060] Optionally, continuing to refer to Figure 1The brushless motor further comprises a stator support part 17 and a bearing 18. The stator support part 17 comprises a bearing fixing part 171 and a base 172, the bearing 18 is fixed in the bearing fixing part 171, and the bearing 18 is sleeved on the outer periphery of the rotating shaft 14; the stator 13 is fixed on the base 172. The stator 13 can be fixed on the base 172 by means of bolts 19, and of course other fixing modes can also be adopted. The bearing fixing part 172 is formed with an accommodating groove, and the bearing 18 is fixed in the accommodating groove.

[0061] Exemplarily, the brushless motor described in the embodiment can be applied to small electronic devices such as fan screens, magnetic discs, display lamp panels and small unmanned aerial vehicles. It is more suitable for electronic products with limited structural space and high efficiency output at high speed.

[0062] It should be understood that the various forms of flow shown above can be used to reorder, add or delete steps. For example, the steps described in the present application can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solutions of the present application can be achieved, and the present application does not limit this.

[0063] The above specific embodiments do not constitute a limitation on the protection scope of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A brushless electric motor characterized by, The brushless motor comprises a first rotor, a second rotor, a stator, a rotating shaft and a rotor support part; The first rotor and the second rotor are arranged along the axial direction of the rotating shaft and are sleeved on the periphery of the rotor support part; the stator is located between the first rotor and the second rotor, and the stator is spaced apart from the first rotor and the second rotor; the rotating shaft is fixedly connected with the rotor support part; the rotor support part can rotate with the first rotor and the second rotor, and the rotating shaft can rotate with the rotor support part; The first rotor comprises a plurality of permanent magnets and a first magnetic conductive material part, and the second rotor comprises a second magnetic conductive material part; wherein the first magnetic conductive material part is located on the side of the permanent magnet away from the stator.

2. The brushless motor of claim 1, wherein, The first rotor further comprises a magnet seat for fixing the plurality of permanent magnets; the magnet seat comprises a plurality of fixing grooves, the plurality of permanent magnets correspond to the plurality of fixing grooves one by one, and the permanent magnets are located in the fixing grooves; the magnet seat is fixedly connected with the rotor support part; the first magnetic conductive material part is located on the side of the magnet seat away from the stator.

3. The brushless motor of claim 2, wherein, The magnet seat and the rotor support part are an integral structure. Alternatively, the magnet seat and the rotor support part are independent structures.

4. The brushless motor of claim 1, wherein, The first rotor comprises a plurality of rotor bars, the rotor bars extend along the radial direction of the first rotor, and the plurality of rotor bars are distributed along the circumferential direction of the first rotor; at least one rotor bar is arranged between adjacent two permanent magnets; one end of adjacent two rotor bars close to the center of the first rotor is connected by a first end ring, and one end of adjacent two rotor bars away from the center of the first rotor is connected by a second end ring.

5. A brushless motor according to claim 2 or 4, characterised in that, The brushless motor further comprises a reinforcing ring coaxially sleeved on the periphery of the first rotor.

6. The brushless motor of claim 1, wherein, The bottom of the rotor support part connected with the rotor is formed with a heat dissipation groove; a plurality of heat dissipation holes are further formed on the rotor support part, and the heat dissipation holes are communicated with the heat dissipation groove and the corresponding air gap of the rotor. The brushless motor further comprises an impeller arranged in the heat dissipation groove.

7. The brushless motor of claim 1, wherein, The stator comprises a plurality of planar stator coils and a coil carrier plate for carrying the planar stator coils. The planar stator coil is a coreless flat winding, and the long axis of the linear section of the planar stator coil is parallel to the axial direction of the stator.

8. The brushless motor of claim 7, wherein, An insulating sheet is arranged between adjacent planar stator coils.

9. The brushless motor of claim 1, wherein, A plurality of detachable spacers are arranged between the parts of the rotor support part connected with the first rotor and the second rotor.

10. The brushless motor of claim 1, wherein, The brushless motor further comprises: a stator support part and a bearing; The stator support part comprises a bearing fixing part and a base, the bearing is fixed in the bearing fixing part, and the bearing is sleeved on the periphery of the rotating shaft; The stator is fixed on the base.

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