Axial flux motor stator assembly and axial flux motor

Abstract

An axial magnetic flux motor stator assembly comprises a stator core, a stator magnet yoke is arranged in the middle of the stator core, a first winding and a second winding are wound on the outer surface of the stator core, the winding directions of the first winding and the second winding are opposite, and the direction of magnetic flux generated by the stator core is parallel to the axial direction of a motor. According to the stator assembly and the axial magnetic flux motor provided by the utility model, the directions of the magnetic fields generated by the stator winding just realize axial symmetry (opposite) of the central axis, so that the two rotors can be simultaneously driven to rotate forwards and backwards in the axial magnetic flux motor with a double-rotor structure. And the axial push-pull forces generated by the two sides on the central shaft of the rotor are mutually counteracted, so that the radial stress of the rotor bearing is balanced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of motor manufacturing control, concretely is axial flux motor stator subassembly and axial flux motor. BACKGROUND

[0002] According to the direction of magnetic flux path, the motor can be divided into axial flux motor and radial flux motor, the magnetic poles of the stator of the axial flux motor are arranged along the axis, the rotor is usually a cylindrical structure, the magnetic flux passes through the central axis of the rotor, when the current passes through the winding of the stator, the magnetic field generated along the axial direction passes through the rotor, according to the law of Lorentz force, the magnetic field will generate torque in the rotor, thereby driving the rotor to rotate. The axial flux motor structure on the market at present mainly adopts single stator double rotor mode, the structure is compact and the air gap is small, the purpose is to maximize the utilization of magnetic flux density. In the prior art, the magnetic field generated by the winding of the stator is in the same direction, under the mutual action of the magnetic force of the rotor permanent magnet, the two rotors on both sides can be driven to rotate forward or reverse at the same time. However, in some paddle driving such as unmanned aerial vehicle, the double paddles may need to rotate forward and reverse at the same time, in order to realize this driving mode, generally two motors are used for driving respectively, or a single motor is combined with a gear box to realize. Although the driving of the stators on both sides can be realized, the transmission components in the middle occupy too much space and increase the weight of the power system.

[0003] Through retrieval, there are related technical documents of axial flux motor in the prior art. For example, the invention patent publication document with the publication number "CN114614648A" and the name "Axial flux weak magnetic speed expansion permanent magnet motor capable of rotating forward and reverse at the same time" discloses an axial flux weak magnetic speed expansion permanent magnet motor capable of rotating forward and reverse at the same time, the permanent magnet motor comprises a rotor, a stator and a motor cooling channel; the rotor is divided into an upper rotor and a lower rotor, both of which are symmetrically arranged at both ends of the stator, and composite permanent magnets are uniformly arranged in the rotor; the stator comprises an upper stator and a lower stator, both of which are connected through a stator yoke, and stator teeth are uniformly and symmetrically arranged on the upper stator and the lower stator, and upper stator windings and lower stator windings are arranged at both ends of the upper stator and the lower stator; the motor cooling channel is arranged outside the stator yoke. Among them, the rotor is made of silicon steel sheets; the stator and the stator yoke are made of silicon steel sheets, which provide a channel for the magnetic pole magnetic circuit. The stator winding in the comparative document is the same as the winding mode, only the phase is different, so it can only realize the simultaneous forward rotation or reverse rotation of the two axial flux permanent magnet motor structures, and cannot realize the simultaneous forward and reverse rotation of the double rotors.

[0004] For example, the publication number is "CN212435557U", the name is "a coaxial double output disc type motor" of utility model authorized announcement file. Disclosed is a coaxial double output disc type motor, including center shaft, the center shaft left and right two ends are equipped with first motor and second motor respectively, each motor includes stator, rotor and encoder electrically connected with controller for monitoring rotor position, the stator is fixedly arranged on the center shaft, the rotor is rotatably arranged on the center shaft through the bearing, the rotor is embedded with magnetic steel matched with the winding on the stator. The comparative file integrates double motor, which needs to be controlled by external controller to realize the same or opposite rotation of two motors. Utility model content

[0005] In view of the deficiency of the prior art, the utility model provides a kind of axial flux motor stator assembly, including stator core, the stator core middle part has stator yoke, first winding and second winding are wound on the outer surface of stator core, the winding direction of first winding and second winding is opposite, and the magnetic flux direction generated by stator core and motor axial parallel.

[0006] Further, the stator core is integrally formed of a magnetic material, and a wire slot is formed on the surface thereof, and the first winding and the second winding are embedded in the wire slot.

[0007] Further, the wire slots on the surface of the stator core are symmetrically arranged in pairs relative to the stator yoke, and the first winding and the second winding are respectively embedded in the wire slots.

[0008] Alternatively, the first winding and the second winding are coaxially wound and embedded in the wire slot.

[0009] Further, the stator core is inclined from the outer periphery of the stator yoke to the center, and the wire slot is an inclined slot formed on the side of the stator core.

[0010] Further, the stator core is fan-shaped and symmetrically distributed with an even number of stator yokes.

[0011] Further, it further comprises an isolation support, a fan-shaped hole matched with the stator core is formed on the isolation support, and a support rib is formed between the fan-shaped holes, the stator core can be embedded in the fan-shaped hole, and the support rib is embedded in the gap between adjacent stator cores.

[0012] Further, an axial flux motor is provided, comprising the above-mentioned stator assembly, further comprising a rotor assembly, the rotor assembly comprising a rotor base and a rotor permanent magnet arranged thereon, the stator core in the stator assembly is symmetrically arranged on both sides of the stator yoke, two rotor assemblies are symmetrically arranged on both sides of the stator assembly, the motor shaft is connected with the rotor base, the shell is enclosed around the outer periphery of the stator assembly and the rotor assembly, and the motor shaft is connected with the bearing at both ends.

[0013] Further, the rotor permanent magnet is inclined from the center of the rotor base to the outer periphery, and the stator core is inclined from the outer periphery of the stator yoke to the center.

[0014] Further, the bearing is a conical thrust roller bearing, and the inclination angle of the stator core and the rotor permanent magnet is consistent with the inclination angle of the roller inside the conical thrust roller bearing.

[0015] Compared with the prior art, the technical scheme has the following beneficial effects: the stator assembly and the axial flux motor can simultaneously drive two rotors to reverse rotation in the axial flux motor with a double-rotor structure, and the axial thrust and pull forces generated by the two sides on the rotor central shaft are offset to balance the radial force of the rotor bearing. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 : Stator winding structure schematic diagram Figure 1 ;

[0017] Figure 2 : Stator winding structure schematic diagram Figure 2 ;

[0018] Figure 3 : Motor stator-rotor flux linkage structure schematic diagram

[0019] Figure 4 : Rotor assembly structure schematic diagram

[0020] Figure 5 : Stator assembly structure schematic diagram

[0021] Figure 6 : Motor overall mechanism schematic diagram

[0022] Figure 7 : Motor split structure schematic diagram

[0023] Figure 8 : Motor along the motor shaft axis sectional view. DETAILED DESCRIPTION

[0024] The technical scheme in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0025] As Figure 1 and Figure 2As shown in the figure, a kind of axial flux motor stator assembly, including stator core 12, the stator core 12 middle part has stator yoke 11, first winding 14 and second winding 15 are wound on the outer surface of stator core 12, the winding direction of the first winding 14 and the second winding 15 is opposite, and the magnetic flux direction generated by stator core 12 is parallel to the motor axial direction.

[0026] In the embodiment, the stator yoke 11 is a disc member, and the stator core 12 is uniformly embedded on the stator yoke 11 in a central symmetry manner. Since the winding directions of the first winding 14 and the second winding 15 are opposite, the magnetic field directions generated by the first winding 14 and the second winding 15 are opposite when the excitation current directions are the same. When the rotor magnetic steel distribution on both sides of the stator assembly and the magnetic field directions are the same, the forces acting on the rotors on both sides by the radial components of the stator excitation winding are just opposite, so that the rotors on both sides can be driven to rotate in opposite directions at the same time. Moreover, the axial thrusts generated by the rotors on both sides to the central shaft of the rotors are offset to each other, so that the radial forces acting on the rotor bearings are balanced, and the operation of the motor is more stable.

[0027] A possible implementation can be as shown in the figure Figure 1 The stator core 12 is integrally formed by a magnetic conductive material, and the surface of the stator core 12 is provided with wire grooves, and the first winding 14 and the second winding 15 are embedded in the wire grooves. The wire grooves on the surface of the stator core 12 are arranged in pairs in a symmetrical manner with respect to the stator yoke 11. In this embodiment, the stator core 12 is a symmetrical structure, and the wire grooves are provided at both ends of the stator core 12, and the first winding 14 and the second winding 15 are embedded in the wire grooves, respectively.

[0028] Another possible implementation is as shown in the figure Figure 2 The first winding 14 and the second winding 15 are coaxially wound and embedded in the wire grooves. In this embodiment, the winding process is relatively complex, but the stator core 12 can have a relatively smaller volume.

[0029] In a more preferred embodiment, the stator core 12 is inclined from the outer periphery to the center of the stator yoke 11, and the wire grooves are inclined grooves 121 provided on the circumferential side of the stator core 12. For details, please refer to Figure 3In the embodiment, the end face of the stator core 12 is inclined. After the winding is wound around the stator core 12, the direction of the magnetic force line in the generated magnetic field is inclined to the motor axial direction. The interaction between the stator core 12 and the rotor permanent magnet 22 is always inclined to the motor axial direction, so there is a certain magnetic force component in the radial direction of the motor. The magnetic force in the vertical direction is maximized, and the working efficiency of the motor is improved. Compared with the parallel arrangement of the stator and rotor magnetic chain structure, the magnetic force component in the axial direction of the motor is reduced, so that the axial pulsating torque of the motor is reduced, and the motor runs more stably. At the initial start of the motor, the inclined magnetic force chain structure enables the motor to have an initial rotating torque, which can simplify the motor start. On the other hand, the inclined arrangement of the stator winding can stir the air gap air when rotating at high speed, which can play the role of the axial flow fan. The generated air flow circulates inside and outside through the ventilation opening designed in the end cover, which can assist in heat dissipation of the rotor body and the stator. Alternatively, the stator core 12 can be inclined outward from the center of the stator yoke 11, but Figure 3 The structure shown can cooperate with the tapered roller bearings at the shaft ends to enable the bearings to bear the maximum vector torque, thereby improving the stability of the motor operation.

[0030] In a more preferred embodiment, referring to Figure 3 and Figure 5 , the stator yoke 11, the stator core 12 and the winding form a stator assembly 1. The stator core 12 is fan-shaped and symmetrically distributed about the center of the stator yoke 11. The stator core 12 is provided with inclined grooves 121 on the circumferential side, and the winding is wound in the inclined grooves 121. The design of the inclined grooves 121 enables the entire excitation winding to be embedded therein, so that the magnetic field generated by the entire stator core 12 can form an inclined magnetic field. In the embodiment, the stator core 12 is preferably made of soft magnetic material in one piece, which has better compactness than the structure of silicon steel sheet and the like.

[0031] In a more preferred embodiment, the stator core 12 is distributed in an even number. The even number distribution enables the stator core 12 to be symmetric about the center and also have axial symmetry, so that the magnetic force chain structure is more reasonable, and the axial pulsation generated when the magnetic force line works can be completely cancelled.

[0032] In a more preferred embodiment, the stator assembly 1 further comprises an isolation support 13. The isolation support 13 is provided with fan-shaped holes 131 matched with the stator core 12, and the fan-shaped holes 131 are supported by ribs 132. The stator core 12 can be embedded in the fan-shaped holes 131, and the ribs 132 can be embedded in the gap between adjacent stator cores 12. The isolation support 13 can enable the magnetic field generated by the stator core 12 after the excitation winding is energized to avoid mutual interference, and can provide stable structural support for the stator assembly 1.

[0033] In this embodiment, an axial flux motor is also provided, comprising the aforementioned stator assembly 1, and further comprising a rotor assembly 2, the rotor assembly comprising a rotor base 21 and a rotor permanent magnet 22 arranged thereon, the stator core 12 of the stator assembly 1 is symmetrically arranged on both sides of the stator yoke 11, two rotor assemblies 2 are symmetrically arranged on both sides of the stator assembly 1, the motor shaft 3 is connected with the rotor base 21, and the shell 4 is enclosed around the outer periphery of the stator assembly 1 and the rotor assembly 2, and the motor shaft 3 is connected with the bearing 5 at both ends.

[0034] In this embodiment, it can be specifically referred to Figures 6-8 and Figure 4 The rotor permanent magnet 22 also has an inclined surface parallel to one side end surface of the stator core 12, and the two are parallel and inclined to each other, forming an air gap with an inclination angle along the radial direction of the motor. The stator core 12 is inclined from the outer periphery of the stator yoke 11 to the center, and the rotor permanent magnet 22 is inclined from the center of the rotor base 21 to the outer periphery. The Lorentz magnetic force acting between the stator core 12 and the rotor permanent magnet 22 will always have an inclination angle in the axial direction of the motor, so there will be a certain magnetic force component in the radial direction of the motor. The magnetic force of the vertical vector is maximized in the direction perpendicular to the rotation axis, improving the work efficiency of the motor. Compared with the parallel arrangement of the stator and rotor magnetic chain structure, the magnetic force component in the axial direction of the motor is reduced, so that the axial pulsating torque of the motor is reduced, and the motor runs more stably. At the initial start of the motor, the inclined magnetic force chain structure makes the motor have an initial rotating torque, which can simplify the start of the motor. The rotor base 21 and the rotor permanent magnet 22 constitute the rotor assembly 2, and the rotor permanent magnet 22 is fan-shaped and symmetrically distributed around the center of the rotor base 21. The fan-shaped rotor permanent magnet 22 will have a larger area, and the gap between them will be more uniform. The stator core 12 and the rotor permanent magnet 22 are both distributed in an even number. The even number distribution makes the stator core 12 and the rotor permanent magnet 22 have central symmetry and axial symmetry, and the magnetic force chain structure is more reasonably distributed, and the axial pulsation generated when the magnetic force line works can be completely offset. The magnetic flux motor has a smaller axial space, and the structure of the double rotor and the stator can balance the axial pulsating torque. The stator core 12 is integrally formed and symmetrically arranged on both sides of the stator yoke 11, and cooperates with the two symmetrically inclined rotor permanent magnets 22 of the rotor assembly 2 to achieve simplified start and always utilize the magnetic force in the direction perpendicular to the rotation axis, thereby improving the work efficiency of the motor.

[0035] The bearing 5 is a tapered thrust roller bearing, and the inclination angle K of the inclined plane between the stator core 12 and the rotor permanent magnet 22 is consistent with the inclination angle of the roller inside the tapered thrust roller bearing. The tapered thrust roller bearing can withstand greater axial pulsating torque, improving the reliability of the motor operation. The inclination angle of the rotor permanent magnet 22 is consistent with the tapering roller angle, so that the bearing can withstand the maximum vector torque.

[0036] It has to be noted that, in the present document, the terms "first", "second", etc. merely serve to identify a subject or action from another subject or action, without necessarily requiring or implying any actual such relationship or order between such subjects or actions. Moreover, the terms "comprising", "containing", or any other similar term are intended to encompass non-exclusive inclusions, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a", "contains... a", or "includes... a" does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0037] While the embodiments of the present application have been illustrated and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and alterations can be made therein without departing from the spirit and scope of the application, which is defined by the appended claims and their equivalents.

Claims

1. An axial flux motor stator assembly characterised in that, The application relates to a motor stator assembly (1) comprising a stator core (12) having a stator yoke (11) in the middle, a first winding (14) and a second winding (15) being wound on the outer surface of the stator core (12), the winding directions of the first winding (14) and the second winding (15) being opposite, and the magnetic flux direction generated by the stator core (12) being parallel to the motor axial direction.

2. An axial flux motor stator assembly as claimed in claim 1, wherein, The stator core (12) is integrally formed by a magnetic conductive material, and the surface is provided with wire slots, and the first winding (14) and the second winding (15) are embedded in the wire slots.

3. An axial flux motor stator assembly as claimed in claim 2, wherein, The wire slots on the surface of the stator core (12) are symmetrically arranged in pairs relative to the stator yoke (11), and the first winding (14) and the second winding (15) are embedded in the wire slots respectively.

4. The axial flux motor stator assembly of claim 2, wherein, The first winding (14) and the second winding (15) are coaxially wound and embedded in the wire slots.

5. The axial flux motor stator assembly of claim 3, wherein, The stator core (12) is inclined from the outer periphery of the stator yoke (11) to the center, and the wire slots are inclined slots (121) provided on the periphery of the stator core (12).

6. An axial flux motor stator assembly as claimed in claim 5, wherein, The stator core (12) is in a fan shape and is symmetrically distributed with an even number of centers of the stator yoke (11).

7. An axial flux motor stator assembly as claimed in claim 6, wherein, The application further comprises an isolation support (13) provided with fan-shaped holes (131) matched with the stator core (12), and support ribs (132) between the fan-shaped holes (131), the stator core (12) can be embedded in the fan-shaped holes (131), and the support ribs (132) are embedded in the gaps between adjacent stator cores (12).

8. An axial flux electric machine characterized by, The application relates to a motor stator assembly (1) comprising a stator core (12) having a stator yoke (11) in the middle, a first winding (14) and a second winding (15) being wound on the outer surface of the stator core (12), the winding directions of the first winding (14) and the second winding (15) being opposite, and the magnetic flux direction generated by the stator core (12) being parallel to the motor axial direction.

9. An axial flux machine as claimed in claim 8, wherein, The stator core (12) is integrally formed by a magnetic conductive material, and the surface is provided with wire slots, and the first winding (14) and the second winding (15) are embedded in the wire slots.

10. An axial flux machine as claimed in claim 9, wherein, The wire slots on the surface of the stator core (12) are symmetrically arranged in pairs relative to the stator yoke (11), and the first winding (14) and the second winding (15) are embedded in the wire slots respectively. The first winding (14) and the second winding (15) are coaxially wound and embedded in the wire slots. The stator core (12) is inclined from the outer periphery of the stator yoke (11) to the center, and the wire slots are inclined slots (121) provided on the periphery of the stator core (12). The stator core (12) is in a fan shape and is symmetrically distributed with an even number of centers of the stator yoke (11). The application further comprises an isolation support (13) provided with fan-shaped holes (131) matched with the stator core (12), and support ribs (132) between the fan-shaped holes (131), the stator core (12) can be embedded in the fan-shaped holes (131), and the support ribs (132) are embedded in the gaps between adjacent stator cores (12). The application relates to a motor stator assembly (1) comprising a stator core (12) having a stator yoke (11) in the middle, a first winding (14) and a second winding (15) being wound on the outer surface of the stator core (12), the winding directions of the first winding (14) and the second winding (15) being opposite, and the magnetic flux direction generated by the stator core (12) being parallel to the motor axial direction. The stator core (12) is integrally formed by a magnetic conductive material, and the surface is provided with wire slots, and the first winding (14) and the second winding (15) are embedded in the wire slots. The wire slots on the surface of the stator core (12) are symmetrically arranged in pairs relative to the stator yoke (11), and the first winding (14) and the second winding (15) are embedded in the wire slots respectively. The first winding (14) and the second winding (15) are coaxially wound and embedded in the wire slots. The stator core (12) is inclined from the outer periphery of the stator yoke (11) to the center, and the wire slots are inclined slots (121) provided on the periphery of the stator core (12). The stator core (12) is in a fan shape and is symmetrically distributed with an even number of centers of the stator yoke (11). The application further comprises an isolation support (13) provided with fan-shaped holes (131) matched with the stator core (12), and support ribs (132) between the fan-shaped holes (131), the stator core (12) can be embedded in the fan-shaped holes (131), and the support ribs (132) are embedded in the gaps between adjacent stator cores (12).

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