Full-rotor brushless motor and double-impeller contra-rotating fan driving assembly

Abstract

The invention provides a full-rotor brushless motor and a double-impeller contra-rotating fan driving assembly, and relates to the technical field of motors, and the full-rotor brushless motor comprises a rotor module, a bearing module and a center shaft; the rotor module comprises a first rotor and a second rotor which are opposite in rotation direction, the first rotor and the second rotor are respectively provided with a first through hole and a second through hole in central areas, the first rotor is provided with a plurality of rare earth permanent magnets, the second rotor is provided with a plurality of electromagnet windings, and phase line parts are led out from the electromagnet windings; the bearing module comprises a first bearing piece and a second bearing piece which are coaxial with each other, the center shaft penetrates through center through holes of the first bearing piece and the second bearing piece, and the phase line part is connected to the second bearing piece and embedded in a plurality of grooves of the center shaft. Under the condition that the absolute speed of the first rotor and the absolute speed of the second rotor are kept unchanged, the relative linear speed between the rare earth permanent magnet and the electromagnet winding can be greatly improved, and the electric energy input power and the mechanical energy output power of the motor are improved.

Description

Technical Field

[0001] The present application relates to the field of motor technology, and in particular to a full-rotor brushless motor and a dual-impeller counter-rotating fan drive assembly. Background Art

[0002] The fan blades are usually driven by a motor. When the fan speed is too fast, the blades are easily broken due to the large centrifugal force and vibration fatigue. The power output density of the motor is directly related to the performance of the motor. Improving the power output density of the motor can effectively improve the performance of the motor.

[0003] For motors of the same volume or weight, the power output density can be increased by converting electrical energy input into more mechanical energy output. To increase the power output density of a motor, you can start from the input power of the motor.

[0004] In the related art, for motors with the same coil winding and permanent magnet physical parameters, the peak current of the motor cannot be increased too high; excessive current can easily cause severe heating of the motor coil; however, in general, when the input voltage is increased, the input current will also increase synchronously. When the voltage is increased, it is difficult to suppress the increase in current. Therefore, it is currently difficult to safely increase the input power of the motor. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present application provides a full-rotor brushless motor and a dual-impeller counter-rotating fan drive assembly, which solves the problem of low power output conversion density existing in traditional motors.

[0006] To achieve the above objectives, this application is implemented through the following technical solutions:

[0007] In a first aspect, an embodiment of the present application provides a full-rotor brushless motor, the full-rotor brushless motor comprising a rotor module, a bearing module and a central shaft; wherein:

[0008] The rotor module comprises a first rotor and a second rotor which are stacked on each other and have opposite rotation directions. The first rotor and the second rotor are respectively provided with a first through hole and a second through hole in the central area along the thickness direction thereof. The first rotor is provided with a plurality of rare earth permanent magnets, and the second rotor is provided with a plurality of electromagnet windings. Each electromagnet winding leads to a phase line portion extending outward.

[0009] The bearing module comprises a first bearing member and a second bearing member which are coaxial with each other, and the first bearing member and the second bearing member are respectively embedded in the first through hole and the second through hole to be connected with the first rotor and the second rotor in a limited position;

[0010] The central shaft is constructed to pass through the central through holes of the first bearing member and the second bearing member, a plurality of grooves are formed on the outer peripheral surface of the central shaft, and the phase line portion is connected to the second bearing member and embedded in the plurality of grooves.

[0011] According to the first aspect of the embodiment of the present application, the first bearing component includes a first bearing, which is coaxially nested with the central axis; the groove is formed along the outer circumference of the central axis and is recessed inward to a preset depth, and multiple grooves are evenly spaced and extend along the length direction of the central axis.

[0012] According to a first aspect of an embodiment of the present application, the phase line portion includes three phase lines, and the three phase lines are connected to a brushless electric controller outside the motor via the second bearing portion and the groove of the central shaft.

[0013] According to the first aspect of the embodiment of the present application, the three phase lines cooperate with the inner and outer rings and metal rollers in the second bearing part to convert the rotating winding circuit connection corresponding to the electromagnet winding into a static circuit connection via the central axis.

[0014] According to a first aspect of the embodiment of the present application, the second bearing portion is coaxially arranged with the central axis, and the second bearing portion includes a second bearing, a third bearing and a fourth bearing arranged sequentially along the first direction, and the three are respectively connected to three phase lines.

[0015] According to a first aspect of the embodiment of the present application, the second bearing, the third bearing and the fourth bearing are rolling bearings and have a lower friction coefficient, and the second bearing, the third bearing and the fourth bearing are also configured to serve as conductive media for the three phase lines.

[0016] According to a first aspect of the embodiment of the present application, the number of rare earth permanent magnets disposed on the first rotor is an even number, and the polarity arrangement directions of adjacent rare earth permanent magnets are opposite.

[0017] According to a first aspect of an embodiment of the present application, the number of rare earth permanent magnets disposed on the first rotor is 18, and the number of electromagnet windings in the second rotor is 12.

[0018] In the second aspect, an embodiment of the present application provides a dual-impeller counter-rotating fan drive assembly, which includes a full-rotor brushless motor and an impeller module, wherein the full-rotor brushless motor is the full-rotor brushless motor in the aforementioned first aspect; the impeller module includes a first impeller and a second impeller, and the first impeller and the second impeller are respectively connected to the first rotor and the second rotor of the full-rotor brushless motor through an impeller base.

[0019] According to the second aspect of the embodiment of the present application, the first impeller and the second impeller are respectively provided with a plurality of first blades and a plurality of second blades evenly spaced apart along their own circumferences; after the full-rotor brushless motor is powered on, the first impeller and the second impeller rotate in opposite directions relative to each other.

[0020] The present application provides a full-rotor brushless motor and a dual-impeller counter-rotating fan drive assembly. Compared with the prior art, it has the following beneficial effects:

[0021] The full-rotor brushless motor provided in the present application is not provided with a stator. The motor includes a rotor module, a bearing module and a central axis passing through the bearing module. The rotor module includes a first rotor and a second rotor with opposite rotation directions. A rare earth permanent magnet is arranged on the first rotor, and an electromagnet winding is arranged on the second rotor. The phase line portion led out of the electromagnet winding can be hidden in a groove opened on the central axis. While keeping the absolute speeds of the first rotor and the second rotor unchanged, the present application can greatly increase the relative linear speed between the rare earth permanent magnet and the electromagnet winding, so that the relative linear speed is increased to twice that of the traditional single-rotor mode. While ensuring that the current and the physical number of turns of the coil remain unchanged, the induced voltage and the input voltage are increased, thereby increasing the electric energy input power and mechanical energy output power of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 is a three-dimensional cross-sectional view of a full-rotor brushless motor provided in an embodiment of the present application;

[0024] Figure 2 is a schematic structural diagram of a dual-impeller counter-rotating fan drive assembly provided in an embodiment of the present application;

[0025] Figure 3 is a schematic structural diagram of an impeller module provided in an embodiment of the present application;

[0026] Figure 4 is a schematic structural diagram of a first rotor including rare earth permanent magnets provided in an embodiment of the present application;

[0027] Figure 5 is a left front view of a second rotor including an electromagnet winding provided in an embodiment of the present application;

[0028] Figure 6 It is a right front view of the second rotor including the electromagnet winding provided in an embodiment of the present application.

[0029] Figure numerals: first rotor 1; second rotor 2; first bearing 3; second bearing 4; third bearing 5; fourth bearing 6; rare earth permanent magnet 7; electromagnet winding 8; first impeller 9; second impeller 10; first blade 11; second blade 12; head guide cone 13; fixed base 14; wire groove 15; bolt 16; center axis 17; groove 17a; phase line welding end plate 18; insulating positioning ring 19; insulating positioning pin 20; iron core 21; winding coil 22; impeller base 23. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0032] The embodiment of the present application solves the problem of low power output conversion density existing in traditional motors by providing a full-rotor brushless motor and a dual-impeller counter-rotating fan drive assembly. While ensuring that the current and the physical number of coil turns remain unchanged, the motor's electrical energy input power is increased, thereby increasing the mechanical energy output power.

[0033] The technical solution in the embodiment of the present application is to solve the above technical problems, and the overall idea is as follows:

[0034] The power output density of a motor is directly related to its performance. Improving the power output density of a motor can effectively improve its performance. Improving the power output density of a motor means that for motors of the same volume or weight, it can convert electrical energy input into more mechanical energy output. To improve the power output density of a motor, you can first consider the input power of the motor; the input power of the motor P = UI. If you need to increase the power input density P, you can consider increasing the input voltage U or the input current I.

[0035] For motors with the same coil winding and permanent magnet physical parameters, increasing the input current I can easily cause the coil to overheat and burn. If the input voltage U can be increased while keeping the input current basically unchanged, the purpose of safely increasing the motor's input power P can be achieved. Generally, when the input voltage U is increased, the input current I will also increase synchronously. How to suppress the increase of current and keep it basically unchanged while increasing the voltage U is an urgent problem to be solved.

[0036] In addition, the self-inductance voltage of the motor coil Among them, for coils of the same physical shape, L0 is the coil self-inductance, K is the constant coefficient, is the current change rate, v is the relative speed between the rotors, r is the radius of the circle between the coil and the magnet, and I is the effective value of the driving current passing through the coil.

[0037] When the current limit value remains unchanged, the faster the current frequency changes, the greater the self-inductance voltage. The energy lost by self-inductance is converted into eddy current heat of the iron and electromagnetic radiation in space. Eddy current loss can be reduced by reducing the thickness of the iron. Increasing the air flow near the iron can improve the heat dissipation performance and reduce the negative impact of eddy current heat on the coil winding. Coil internal resistance voltage U R0 =I×R0. Among them, I is the effective value of the driving current passing through the coil, and R0 is the internal resistance of the coil. When the current remains unchanged, the internal resistance voltage U R0 The peak current of the motor cannot be increased too high, as excessive current can easily cause serious heating of the motor coil. However, by increasing the loaded voltage and increasing the relative speed of the stator and rotor, the energy input and output density of the motor can be further improved.

[0038] The thrust F generated by the rotor in the circumferential direction is BIL. Among them, I is the effective value of the driving current passing through the coil, L is the characteristic length of the coil wire, and B is the characteristic field strength of the magnet. The reverse induced voltage U generated by the rotor cutting the magnetic lines of force in =BLv. Among them, B is the characteristic field strength of the magnet, L is the characteristic length of the coil wire, and v is the relative speed between the rotors. The input power P of the motor satisfies the expression:

[0039] P=UI

[0040] =(U in +U L0 +U R0 )×I

[0041] =(BLv+KL0v / r+R0)×I

[0042] =BILv+KIL0v / r+IR0

[0043] =Fv+(KIL0v / r+IR0)

[0044] =Fv+P Q =P M +P Q

[0045] Among them, U is the input voltage of the motor, I is the effective value of the driving current passing through the coil, and U in It is the reverse induced voltage generated by the rotor coil cutting the magnetic lines of force, U L0 is the self-inductance voltage of the motor coil, U R0 is the coil internal resistance voltage, B is the characteristic field strength of the magnet, L is the characteristic length of the coil wire, v is the relative speed between the rotors, r is the radius of the circle between the coil and the magnet, L0 is the coil self-inductance, K is the constant coefficient, R0 is the coil internal resistance, F is the thrust generated by the rotor in the circumferential direction, P Q is the heat loss power of the motor, P M It is the mechanical kinetic energy power output by the motor.

[0046] Furthermore, the motor is the driving component of the fan, and the rotation speed of the fan blades is directly related to the speed of the motor rotor. When the fan speed is too fast, the blades are easily broken due to the large centrifugal force and vibration fatigue, so the absolute speed of the fan needs to be reduced. Based on this, in the process of increasing the relative speed between the stator and the rotor, we cannot rely solely on the increase in the absolute speed of the rotor.

[0047] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0048] The following first introduces a full-rotor brushless motor provided in an embodiment of the present application.

[0049] The present invention provides a full-rotor brushless motor, please refer to Figure 1The full-rotor brushless motor includes a rotor module, a bearing module and a central shaft 17; the rotor module includes a first rotor 1 and a second rotor 2 which are stacked on each other and have opposite rotation directions, and the first rotor 1 and the second rotor 2 are respectively provided with a first through hole and a second through hole in the central area along their own thickness direction, the first rotor 1 is provided with a plurality of rare earth permanent magnets 7, and the second rotor 2 is provided with a plurality of electromagnet windings 8, and each electromagnet winding 8 has a phase line portion extending outward.

[0050] Specifically, the bearing module includes a first bearing member and a second bearing member that are coaxial with each other, and the two are respectively embedded in the first through hole and the second through hole to be limitedly connected with the first rotor 1 and the second rotor 2; the central shaft 17 is constructed so that it passes through the central through holes of the first bearing member and the second bearing member, and a plurality of grooves 17a are provided on the outer peripheral surface of the central shaft 17, and the phase line portion is connected to the second bearing member and embedded in the plurality of grooves 17a.

[0051] In the embodiment of the present application, the full-rotor brushless motor is not provided with a stator. The motor includes a rotor module, a bearing module and a central axis 17 passing through the bearing module. The rotor module includes a first rotor 1 and a second rotor 2 with opposite rotation directions. A rare earth permanent magnet 7 is arranged on the first rotor 1, and an electromagnet winding 8 is arranged on the second rotor 2. The phase line portion led out of the electromagnet winding 8 can be hidden in the groove 17a opened on the central axis 17.

[0052] It is understandable that due to the influence of structural material parameters and inertia force, the speed of a single rotor of the motor cannot be too fast. Too fast speed can easily cause problems such as rotor material cracking and loose winding. The maximum absolute speed of a single rotor is limited to v max In the following cases, the present application adopts a method in which the two rotors rotate in opposite directions to increase the relative speed between the two rotors.

[0053] It should be noted that, while keeping the absolute speeds of the first rotor 1 and the second rotor 2 unchanged, the present application can greatly increase the relative linear speed between the rare earth permanent magnet 7 and the electromagnet winding 8 by having the first rotor 1 and the second rotor 2 rotate relative to each other, so that the relative linear speed is increased to twice that in the traditional single rotor mode.

[0054] Based on this, the absolute speed of the first rotor 1 and the second rotor 2 in the full-rotor brushless motor provided by the present application can remain unchanged or decrease relative to the external environment, thereby avoiding the problem of serious heating of the equipment caused by excessive current growth. The present application replaces the traditional stator-rotor matching method by matching the first rotor 1 and the second rotor 2 with opposite rotation directions. While ensuring that the current remains basically unchanged and the physical number of turns of the coil remains unchanged, the induced voltage and input voltage can be increased, thereby increasing the motor's electrical energy input power and mechanical energy output power.

[0055] It should be emphasized that from the perspective of improving power conversion density, if it is necessary to increase the power input density, you can consider increasing the input voltage or input current. For motors with the same coil winding and permanent magnet physical parameters, increasing the input current can easily cause the coil to overheat and burn; if the input voltage can be increased while keeping the input current basically unchanged, the purpose of safely increasing the input power of the motor can be achieved. Generally, when the input voltage is increased, the input current will increase synchronously. How to suppress the increase of current while increasing the voltage and keep the device basically unchanged is a problem that can be solved by setting up a full-rotor brushless motor in this application.

[0056] The present application increases the input voltage of the motor to about twice the original voltage by increasing the relative speed between the first rotor and the second rotor without changing the absolute speed of the rotor and the total input current, thereby achieving the purpose of improving the overall power input density of the motor.

[0057] In an example, please refer to Figure 1 and Figure 2 The first end of the central axis 17 is connected to the head guide cone 13, and the second end of the central axis 17 is connected to the fixed base 14. The fixed base 14 is provided with a wire groove 15 to connect with the groove 17a, and the fixed base 14 is fixed by bolts 16.

[0058] In another example, see Figure 5 The phase line part is fixed by a phase line welding end plate 18, and the phase line welding end plate 18 is limited by the cooperation of an insulating positioning ring 19 and an insulating positioning pin 20; the electromagnet winding 8 includes an iron core 21 and a winding coil 22.

[0059] In some embodiments, the first bearing member includes a first bearing 3, and the first bearing 3 is coaxially nested with the central shaft 17; the groove 17a is formed by being recessed inwardly at a preset depth along the outer circumference of the central shaft 17, and a plurality of grooves 17a are evenly spaced and extend along the length direction of the central shaft 17. It can be understood that the first bearing 3 is used to connect the first rotor 1 and the central shaft 17, and the preset depth corresponding to the groove 17a corresponds to the size of the phase line portion to accommodate the extended arrangement of the phase line portion.

[0060] In some embodiments, the phase line portion includes three phase lines U, V, and W, and the three phase lines U, V, and W are connected to the brushless electric controller outside the motor through the second bearing portion and the groove 17a of the central shaft 17; the three phase lines U, V, and W cooperate with the inner and outer rings and metal rollers in the second bearing portion to convert the rotating winding circuit connection corresponding to the electromagnet winding 8 into a static circuit connection through the central shaft 17; the second bearing portion is coaxially arranged with the central shaft 17, please refer to Figure 1 and Figure 6The second bearing portion includes a second bearing 4, a third bearing 5 and a fourth bearing 6 which are sequentially arranged along the first direction, and the three are connected to three phase lines U, V, and W respectively.

[0061] In the embodiment of the present application, it can be understood that, unlike the traditional method of converting a rotating circuit into a static circuit through brushes, conductive slip rings or merge rings, the present application adopts a second bearing 4, a third bearing 5 and a fourth bearing 6 containing three metal rollers to convert the rotating winding circuit connection into a static circuit connection on the central shaft 17, and leads it to the brushless electric controller outside the motor through multiple grooves 17a on the central shaft 17.

[0062] It should also be noted that if the rotor needs to rotate more smoothly, a bearing component is inevitable, and the stability of a single bearing is not as good as that of multiple bearings. The present application increases the number of rotor bearings from one or two to three, so that the second rotor 2 runs more smoothly and stably, avoiding frequent vibrations during rotation.

[0063] In some embodiments, the second bearing 4 , the third bearing 5 and the fourth bearing 6 are rolling bearings with a low friction coefficient, and the second bearing 4 , the third bearing 5 and the fourth bearing 6 are also configured to serve as conductive media for the three phase lines U, V, W.

[0064] In the embodiments of the present application, it can be understood that traditional motors usually adopt the form of a slip ring plus a bearing, which has a complex structure; the brushes of the slip ring are constantly worn, which reduces the rotation efficiency of the motor, generates metal dust to pollute the environment, and causes short circuit failures, etc.

[0065] It should be noted that since the second bearing 4, the third bearing 5 and the fourth bearing 6 are also used for conducting the three phase lines U, V and W, there is no need to add additional brushes or conductive slip rings. The full-rotor brushless motor in this application is a form without conductive slip rings or slip rings. The removal of slip rings reduces the friction generated by traditional brushes. This application combines the two functional components of conductive slip rings and bearings into one, without sliding friction components such as brushes, and relies on rolling bearings to complete power transmission, avoiding the problem of reduced life caused by brush wear.

[0066] In addition, rolling bearings have a lower friction coefficient than brushes that are always in a sliding friction state, which can improve the movement efficiency of the mechanism. The present application can also reduce the contact wear of the brushes and the metal dust pollution caused by them; thereby avoiding circuit breakage caused by metal dust and reducing the health damage to the workers near the equipment.

[0067] In some embodiments, please refer to Figure 4, the number of the rare earth permanent magnets 7 disposed on the first rotor 1 is an even number, and the polarity arrangement directions of adjacent rare earth permanent magnets 7 are opposite. For example, the number of the rare earth permanent magnets 7 disposed on the first rotor 1 can be set to 18. Please refer to Figure 5 and Figure 6 , the number of the electromagnet windings 8 in the second rotor 2 can be set to twelve.

[0068] This application also provides a dual-impeller counter-rotating fan drive assembly, please refer to Figure 2 and Figure 3 The dual-impeller counter-rotating fan driving assembly includes a full-rotor brushless motor and an impeller module, wherein the impeller module includes a first impeller 9 and a second impeller 10, and the first impeller 9 and the second impeller 10 are respectively connected to the first rotor 1 and the second rotor 2 of the full-rotor brushless motor through an impeller base 23. The first impeller 9 and the second impeller 10 are respectively evenly spaced along their own circumferences. A plurality of first blades 11 and a plurality of second blades 12 are respectively evenly spaced; after the full-rotor brushless motor is powered on, the first impeller 9 and the second impeller 10 rotate in opposite directions relative to each other.

[0069] In the embodiment of the present application, it is understood that when the fan speed is too fast, the fan blades are easily broken due to the large centrifugal force and mechanism vibration fatigue. Therefore, it is necessary to reduce the absolute speed of the fan blades. Therefore, the increase in the relative speed between the stator and the rotor cannot rely solely on the increase in the absolute speed of the rotor.

[0070] It should be noted that the first impeller 9 and the second impeller 10 of the present application rotate in opposite directions, and while reducing the absolute speed of a single impeller in the first impeller 9 and the second impeller 10, the relative speed between the first impeller 9 and the second impeller 10 can still be effectively increased, thereby improving the driving efficiency of the external fan blade load that rotates in opposite directions. The present application increases the relative speed between the two counter-rotating impellers without increasing the absolute speed of a single impeller, thereby causing the air, water or other fluid disturbed by the first blade 11 and the second blade 12 to generate a greater axial flow velocity and backward thrust.

[0071] In summary, compared with the prior art, this application has the following beneficial effects:

[0072] 1. In the present application, while keeping the absolute speeds of the first rotor 1 and the second rotor 2 unchanged, the relative linear speed between the rare earth permanent magnet 7 and the electromagnet winding 8 can be greatly increased by making the first rotor 1 and the second rotor 2 rotate against each other, so that the relative linear speed is increased to twice that in the traditional single rotor mode.

[0073] 2. The full-rotor brushless motor provided in the present application can appropriately increase the loading voltage to avoid serious heating of the equipment caused by excessive current growth. By replacing the traditional stator-rotor matching method with the first rotor 1 and the second rotor 2 with opposite rotation directions, the induced voltage and input voltage can be increased while ensuring that the current remains basically unchanged and the physical number of turns of the coil remains unchanged, thereby increasing the motor's electrical energy input power and mechanical energy output power.

[0074] 3. The second bearing 4, the third bearing 5 and the fourth bearing 6 in the present application are also configured to serve as conductive media for the three phase lines U, V, and W, without the need to add additional brushes or conductive slip rings, thereby reducing the friction generated by the brushes and improving the movement efficiency of the mechanism.

[0075] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A full-rotor brushless motor, characterized in that: include: A rotor module, comprising a first rotor and a second rotor stacked on each other and having opposite rotation directions, wherein the first rotor and the second rotor are respectively provided with a first through hole and a second through hole in the central area along the thickness direction thereof, the first rotor is provided with a plurality of rare earth permanent magnets, and the second rotor is provided with a plurality of electromagnet windings, and each of the electromagnet windings leads to a phase line portion extending outward; A bearing module, comprising a first bearing member and a second bearing member coaxial with each other, and the first bearing member and the second bearing member are respectively embedded in the first through hole and the second through hole to be in position-limited connection with the first rotor and the second rotor; and The central shaft is constructed to pass through the central through holes of the first bearing member and the second bearing member, a plurality of grooves are formed on the outer peripheral surface of the central shaft, and the phase line portion is connected to the second bearing member and embedded in the plurality of grooves.

2. The full-rotor brushless motor according to claim 1, characterized in that: The first bearing member includes a first bearing, which is coaxially nested with the central axis; the groove is formed by being recessed inwardly to a preset depth along the outer circumference of the central axis, and a plurality of the grooves are evenly spaced and extend along the length direction of the central axis.

3. The full-rotor brushless motor according to claim 1 or 2, characterized in that: The phase line portion includes three phase lines, and the three phase lines are connected to a brushless electric controller outside the motor via the second bearing portion and the groove of the central shaft.

4. The full-rotor brushless motor according to claim 3, characterized in that: The three phase lines cooperate with the inner and outer rings and metal rollers in the second bearing part to convert the rotating winding circuit connection corresponding to the electromagnet winding into a static circuit connection via the central axis.

5. The full-rotor brushless motor according to claim 3, characterized in that: The second bearing portion is coaxially arranged with the central axis, and comprises a second bearing, a third bearing and a fourth bearing which are sequentially arranged along the first direction, and the three bearings are respectively connected to the three phase lines.

6. The full-rotor brushless motor according to claim 5, characterized in that: The second bearing, the third bearing and the fourth bearing are rolling bearings with a low friction coefficient, and the second bearing, the third bearing and the fourth bearing are also configured to serve as conductive media for the three phase lines.

7. The full-rotor brushless motor according to claim 1 or 2, characterized in that: The number of the rare earth permanent magnets arranged on the first rotor is an even number, and the polarity arrangement directions of adjacent rare earth permanent magnets are opposite.

8. The full-rotor brushless motor according to claim 7, characterized in that: The number of the rare earth permanent magnets arranged on the first rotor is 18, and the number of the electromagnet windings in the second rotor is 12.

9. A dual-impeller counter-rotating fan drive assembly, characterized in that: It comprises a full-rotor brushless motor and an impeller module, wherein the full-rotor brushless motor is the full-rotor brushless motor as described in any one of claims 1-8; the impeller module comprises a first impeller and a second impeller, and the first impeller and the second impeller are respectively connected to the first rotor and the second rotor of the full-rotor brushless motor through an impeller base.

10. The dual-impeller counter-rotating fan drive assembly according to claim 9, characterized in that: The first impeller and the second impeller are respectively provided with a plurality of first blades and a plurality of second blades evenly spaced along their own circumferences; after the full-rotor brushless motor is powered on, the first impeller and the second impeller rotate in opposite directions relative to each other.

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