Motor stator and rotor flux linkage structure and axial flux motor

Abstract

A motor stator and rotor flux linkage structure comprises a stator iron core arranged on a stator magnet yoke and a rotor permanent magnet arranged on a rotor base, a winding is arranged on the periphery of the stator iron core, and the planes of the stator magnet yoke and the rotor base are parallel to each other and are perpendicular to the axis of a motor. Inclined planes which are parallel to each other and have inclination angles along the radial direction of the motor are arranged between the stator core and the rotor permanent magnet. According to the motor stator and rotor flux linkage structure and the axial flux motor provided by the utility model, the stator winding and the rotor permanent magnet are obliquely arranged, so that magnetic lines of the stator winding and the rotor permanent magnet have components along the radial direction of the motor when doing work, and more magnetic lines participate in doing work, thereby improving the efficiency of the motor.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of motor manufacturing control, concretely is a motor stator flux linkage structure and axial flux motor for 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 use of magnetic flux density, the magnetic field direction of the rotor (permanent magnet) and the stator (excitation winding) is parallel arrangement, there is a large magnetic loss (magnetic loss) heating in the starting and running process. At the same time, a large axial thrust is generated, which will produce a severe pulsating thrust on the bearing. Since the magnetic field direction of the rotor (permanent magnet) and the stator (excitation winding) is parallel arrangement, the magnetic force lines participating in work along the radial direction of the motor are limited, and a starting torque needs to be provided to make the rotor stator magnetic pole staggered to produce a rotating torque to start the motor.

[0003] Through retrieval, there are related technical documents of axial flux motor in the prior art. For example, the invention patent publication document with publication number "CN115276359A" and the name "Rotor assembly for axial flux motor and axial flux motor" discloses a rotor assembly for axial flux motor and axial flux motor. The rotor assembly for axial flux motor comprises: a support, the support surrounds and is fixed to the main shaft of the axial flux motor; a plurality of iron cores, the plurality of iron cores are arranged on one side of the support in the axial direction and are arranged at intervals in the circumferential direction of the support, the surface of the iron core away from the axis of the support has a mounting groove; a plurality of magnetic steels, the plurality of magnetic steels are respectively inserted into the plurality of mounting grooves, and the magnetic steel is inclined towards the support along one direction of the circumferential direction of the support. The comparative document aims to solve the problems of weakening the harmonic magnetic field and reducing the noise of the axial flux motor.

[0004] For example, the publication number is "CN218102741U", the name is "stator assembly and motor" of utility model authorized announcement file. Disclose a kind of stator assembly and motor, stator assembly includes: shell;Stator core, stator core is located in shell and includes base and tooth portion, tooth portion is located in the side of base in the axial direction of stator assembly;Multiple stator windings, the middle part of each stator winding has mounting hole, mounting hole corresponds with tooth portion shape to make tooth portion insert into stator winding;Wherein, tooth portion extends along the direction inclined to the plane where base is located.The comparative file aims at solving the vibration and noise problem brought by torque ripple.The above-mentioned comparative file is all for improving motor efficiency, simplifying motor starting mode and proposing corresponding improvement. Utility model content

[0005] For the deficiencies of the prior art, the utility model provides a motor stator rotor flux linkage structure, including the stator core of setting on the stator yoke and the rotor permanent magnet of setting on the rotor base, the stator core has winding on the outer periphery, the stator yoke, the rotor base plane is parallel to each other and is perpendicular to motor axis, the stator core and the rotor permanent magnet have the inclined plane that is parallel to each other and has the inclination angle along the radial direction of motor.

[0006] Further, the stator core is inclined from the outer periphery of the stator yoke to the center, and the rotor permanent magnet is inclined from the center of the rotor base to the outer periphery.

[0007] Further, the rotor base and the rotor permanent magnet constitute a rotor assembly, and the rotor permanent magnet is fan-shaped and symmetrically distributed about the center of the rotor base.

[0008] Further, the stator yoke, the stator core and the winding constitute a stator assembly, the stator core is fan-shaped and symmetrically distributed about the center of the stator yoke, and the stator core is provided with an inclined slot on the side thereof, and the winding is wound in the inclined slot.

[0009] Further, the stator core and the rotor permanent magnet are both distributed in an even number.

[0010] Further, the stator assembly further comprises an isolation support, the isolation support is provided with fan-shaped holes matched with the stator core, and the fan-shaped holes are supported by ribs, the stator core can be embedded in the fan-shaped holes, and the ribs are embedded in the gaps between adjacent stator cores.

[0011] Further, an axial flux motor is provided, comprising the above-mentioned motor stator rotor flux linkage structure, 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 bearings are connected to both ends of the motor shaft.

[0012] Further, the bearing is a conical thrust roller bearing, and the tilt plane angle between the stator core and the rotor permanent magnet is consistent with the roller angle inside the conical thrust roller bearing.

[0013] Further, the stator yoke is provided with holes matching the stator core, and the stator core is embedded in the holes and has tilt planes at both ends, and the tilt planes at both ends are symmetric to the plane of the stator yoke.

[0014] Compared with the prior art, the technical scheme has the following beneficial effects: the motor stator-rotor magnetic chain structure and the axial flux motor have the stator winding and the rotor permanent magnet which are both arranged obliquely, so that the magnetic force lines have a component along the radial direction of the motor when doing work, more magnetic force lines participate in doing work, and the motor efficiency is improved.

[0015] The obliquely arranged stator winding and rotor permanent magnet reduce the magnetic force component in the axial direction of the motor, so that the axial pulsating torque of the motor is reduced, and the motor operates more stably.

[0016] The obliquely arranged stator winding and rotor permanent magnet agitate the air gap air when rotating at high speed, play the role of an axial flow fan, the generated air flow circulates inside and outside through the ventilation opening designed in the end cover, and has an auxiliary heat dissipation effect on the rotor body and the stator. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 : schematic view of a motor stator-rotor magnetic chain structure;

[0018] Figure 2 : schematic view of a rotor assembly structure;

[0019] Figure 3 : schematic view of a stator assembly structure;

[0020] Figure 4 : schematic view of a motor overall mechanism;

[0021] Figure 5 : schematic view of a motor split structure;

[0022] Figure 6 : sectional view of a motor along a motor shaft axis. DETAILED DESCRIPTION

[0023] 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.

[0024] A motor stator-rotor magnetic chain structure, comprising a stator core 12 arranged on a stator yoke 11 and a rotor permanent magnet 22 arranged on a rotor base 21, the stator core 12 has windings on its outer periphery, the stator yoke 11 and the rotor base 21 are parallel to each other and perpendicular to the motor axis, and the stator core 12 and the rotor permanent magnet 22 have mutually parallel and inclined planes K with an inclination angle along the motor radial direction.

[0025] Specifically, refer to Figures 1-3 In the embodiment, the end face of the stator core 12 is inclined, and after the windings are wound on the periphery of the stator core 12, the magnetic force line direction in the generated magnetic field will have a certain inclination angle with the motor axis. Similarly, the rotor permanent magnet 22 also has an inclined surface parallel to the end face 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 motor radial direction. The interaction between the stator core 12 and the rotor permanent magnet 22 will always have an inclination angle with the motor axis, so there will be a certain magnetic force component in the motor radial direction, and the magnetic force of the vertical vector is maximized in the direction perpendicular to the rotation axis, thereby improving the work efficiency of the motor. Compared with the parallel stator-rotor magnetic chain structure, the magnetic force component in the motor axial direction is reduced, so the axial pulsating torque of the motor is reduced, and the motor runs more stably. At the initial stage of motor starting, the inclined magnetic force chain structure enables the motor to have an initial rotating torque, thereby simplifying the motor starting.

[0026] On the other hand, the inclined stator windings and the rotor permanent magnet 22 will stir the air in the air gap when rotating at high speed, acting as an axial flow fan, and the generated air flow circulates inside and outside through the ventilation openings designed in the end cover, thereby achieving the effect of auxiliary heat dissipation for the rotor body and the stator.

[0027] A possible embodiment of the magnetic force chain structure can be as shown in Figure 1 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. Alternatively, the stator core 12 can be inclined from the center of the stator yoke 11 to the outer periphery, and the rotor permanent magnet 22 can be inclined from the outer periphery of the rotor base 21 to the center. However Figure 1 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.

[0028] In a more preferred embodiment, referring to Figure 2 The rotor base 21 and the rotor permanent magnet 22 form a rotor assembly 2, and the rotor permanent magnet 22 is fan-shaped and symmetrically distributed about the center of the rotor base 21. The fan-shaped rotor permanent magnet 22 will have a larger area, and the gaps between the rotor permanent magnets will be more uniform.

[0029] In a more preferred embodiment, referring toFigure 3 The stator yoke 11, stator core 12, and windings constitute the stator assembly 1. The stator core 12 is fan-shaped and symmetrically distributed around the center of the stator yoke 11. Inclined slots 121 are formed on the periphery of the stator core 12, and the windings are wound within these slots. The design of the inclined slots 121 allows the entire excitation winding to be embedded within them, enabling the magnetic field generated by the entire stator core 12 to form an inclined magnetic field. In this embodiment, the stator core 12 is preferably integrally made of a soft magnetic material, which offers better structural compactness compared to structures such as silicon steel sheets.

[0030] In a more preferred embodiment, the stator core 12 and the rotor permanent magnet 22 are both distributed in even numbers. The even number distribution makes the stator core 12 and the rotor permanent magnet 22 both centrally symmetrical and axially symmetrical, resulting in a more reasonable magnetic flux linkage structure distribution, and the axial pulsation generated when the magnetic lines of force do work can be completely canceled out.

[0031] In a more preferred embodiment, the stator assembly 1 further includes an isolation bracket 13. The isolation bracket 13 has fan-shaped holes 131 that match the stator core 12, and support ribs 132 are located 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 isolation bracket 13 can prevent the magnetic fields generated by the stator core 12 after the excitation winding is energized from interfering with each other, and can provide stable structural support for the stator assembly 1.

[0032] This embodiment also relates to an axial flux motor, including the motor stator and rotor flux linkage structure described in the above embodiments. In the stator assembly 1, the stator core 12 is symmetrically arranged on both sides of the stator yoke 11, and two rotor assemblies 2 are symmetrically arranged on both sides of the stator assembly 1. The motor shaft 3 is connected to the rotor base 21, and the outer shell 4 surrounds the outer periphery of the stator assembly 1 and the rotor assembly 2. The two ends of the motor shaft 3 are connected to bearings 5.

[0033] For details, please refer to [link / reference]. Figures 4-6 This flux motor has a small axial space, and the dual-rotor and stator structure can balance the axial pulsating torque. The stator core 12 is integrally formed and symmetrically arranged on both sides of the stator yoke 11. Together with the two rotor assemblies 2 and the symmetrically tilted rotor permanent magnets 22, it can simplify the start-up process and always utilize the magnetic force in the vector direction perpendicular to the rotation axis, thereby improving the motor's working efficiency.

[0034] The bearing 5 is a tapered thrust roller bearing, and the tilt angle K of the inclined plane between the stator core 12 and the rotor permanent magnet 22 is consistent with the roller tilt angle inside the tapered thrust roller bearing. The tapered thrust roller bearing can withstand a larger axial pulsating torque, improving the reliability of motor operation. The tilt angle of the rotor permanent magnet 22 is consistent with the tapered roller angle, allowing the bearing to withstand the maximum vector torque.

[0035] In a more preferred embodiment, the stator yoke 11 is provided with holes matching the stator core 12, and the stator core 12 is inserted into the holes and has inclined planes K at both ends, and the inclined planes K at both sides are plane-symmetric with respect to the stator yoke 11.

[0036] It is to be noted that the relative terms such as first and second, and the like, are used herein only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between such entities or operations. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, 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. Without further limitation, an element preceded by "comprises a" does not, without more limitations, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the recited element.

[0037] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A motor rotor flux linkage structure, characterized by, The motor comprises a stator core (12) arranged on a stator yoke (11) and a rotor permanent magnet (22) arranged on a rotor base (21), the stator core (12) has windings on the outer periphery, the stator yoke (11) and the rotor base (21) are parallel to each other and perpendicular to the motor axis, and the stator core (12) and the rotor permanent magnet (22) have mutual parallel and inclined planes (K) with an inclination angle along the radial direction of the motor.

2. The motor rotor flux structure of claim 1, wherein, The stator core (12) is inclined from the outer periphery to the center of the stator yoke (11), and the rotor permanent magnet (22) is inclined from the center to the outer periphery of the rotor base (21).

3. The motor rotor flux structure of claim 2, wherein, The rotor base (21) and the rotor permanent magnet (22) form a rotor assembly (2), and the rotor permanent magnet (22) is fan-shaped and symmetrically distributed about the center of the rotor base (21).

4. The motor rotor flux structure of claim 3, wherein, The stator yoke (11), the stator core (12) and the windings form a stator assembly (1), the stator core (12) is fan-shaped and symmetrically distributed about the center of the stator yoke (11), and the stator core (12) is provided with an inclined slot (121) on the side, and the windings are wound in the inclined slot (121).

5. The motor rotor flux structure of claim 4, wherein, The stator core (12) and the rotor permanent magnet (22) are both distributed in an even number.

6. The motor rotor flux structure of claim 4, wherein, 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) therebetween, the stator core (12) can be embedded in the fan-shaped holes (131), and the ribs (132) are embedded in the gaps between adjacent stator cores (12).

7. An axial flux electric machine characterised in that, The motor comprises the motor stator-rotor flux linkage structure according to any one of claims 4-6, the stator core (12) in 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), a motor shaft (3) is connected with the rotor base (21), an outer 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 bearings (5) at both ends.

8. An axial flux machine as claimed in claim 7, wherein, The bearings (5) are tapered thrust roller bearings, and the inclination angle of the inclined planes (K) between the stator core (12) and the rotor permanent magnet (22) is consistent with the inclination angle of the rollers inside the tapered thrust roller bearings.

9. An axial flux machine as claimed in claim 8, wherein, The stator yoke (11) is provided with holes matched with the stator core (12), the stator core (12) is embedded in the holes and has inclined planes (K) at both ends, and the inclined planes (K) on both sides are symmetric about the plane of the stator yoke (11).

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