CN118157360A - Rotor of axial magnetic field motor, manufacturing method of rotor and axial magnetic field motor - Google Patents

Abstract

The invention relates to the technical field of motors, and discloses a rotor of an axial magnetic field motor, a manufacturing method of the rotor and the axial magnetic field motor. The axial magnetic field motor comprises a stator and a rotor, the rotor comprises a rotor support, a plurality of magnetic steel units and a fixed ring, the magnetic steel units are arranged at intervals along the circumferential direction and are supported on the rotor support, the fixed ring is arranged on the periphery of the rotor support in a surrounding mode and is used for radially restraining the magnetic steel units, each magnetic steel unit comprises an inner ring magnetic steel component and an outer ring magnetic steel component which are distributed along the radial direction, each inner ring magnetic steel component is axially divided into at least one inner subsection, each outer ring magnetic steel component is axially divided into at least one outer subsection, at least one of the inner subsections and the outer subsections in the same magnetic steel unit is magnetic steel, and the rest is a magnetizer. According to the rotor of the axial magnetic field motor, the magnetic steel unit part of the rotor adopts the magnetizer to form the false magnetic steel, so that the dosage of the magnetic steel is reduced and the manufacturing cost is reduced on the premise of ensuring better magnetic flux.

Description

Rotor of axial magnetic field motor, manufacturing method of rotor and axial magnetic field motor

Technical Field

The present invention relates to the field of axial magnetic field motors, and in particular, to a rotor of an axial magnetic field motor, a method for manufacturing the same, and an axial magnetic field motor.

Background

The axial magnetic field motor is also called a disk motor, has the advantages of small axial size, high torque density, high power density, high efficiency and the like, and is widely applied to the fields of electric automobiles, general industries, household appliances and the like. In the prior art, as shown in fig. 1, a rotor of an axial field motor generally includes a rotor bracket 1', a fixing ring 3', and a plurality of magnetic steels 2'. Wherein, be formed with a plurality of mounting grooves 11' on the rotor support 1', a plurality of magnet steel 2' are respectively corresponding to be installed in each mounting groove 11', and the periphery of rotor support 1' is located to solid fixed ring 3' cover to make magnet steel 2' radially spacing between solid fixed ring 3' and rotor support 1 '. However, the manufacturing cost of the magnetic steel is high, which results in high manufacturing cost of the rotor and the axial field motor.

Disclosure of Invention

The first object of the present invention is to provide a rotor of an axial magnetic field motor, wherein a magnetic steel unit part of the rotor adopts a magnetizer to form a false magnetic steel, so that the dosage of the magnetic steel is reduced and the manufacturing cost is reduced on the premise of ensuring better magnetic flux.

To achieve the purpose, the invention adopts the following technical scheme:

The rotor of the axial magnetic field motor comprises a rotor bracket, a plurality of magnetic steel units and a fixed ring, wherein the magnetic steel units are arranged at intervals along the circumferential direction and supported on the rotor bracket, and the fixed ring is arranged on the periphery of the rotor bracket in a surrounding manner and radially constrains the magnetic steel units;

The magnetic steel unit comprises an inner ring magnetic steel component and an outer ring magnetic steel component which are distributed along the radial direction, the inner ring magnetic steel component is axially divided into at least one inner subsection, the outer ring magnetic steel component is axially divided into at least one outer subsection, at least one of the inner subsection and the outer subsection in the same magnetic steel unit is magnetic steel, and the rest is a magnetizer.

As an alternative scheme, the inner ring magnetic steel assembly is axially divided into at least two inner subsections, one of the two circumferentially adjacent inner subsections is magnetic steel, and the other is a magnetizer; and/or

The outer ring magnetic steel assembly is axially divided into at least two outer subsections, one of the two circumferentially adjacent outer subsections is magnetic steel, and the other is a magnetizer.

As an alternative, on the same side of the rotor support, one of the two adjacent inner subsections along the circumferential direction is magnetic steel, and the other is a magnetizer; and/or the same side of the rotor support, wherein one of the two adjacent outer subsections along the circumferential direction is magnetic steel, and the other is a magnetizer.

As an alternative, the fixing ring is formed by solidifying a plurality of layers of carbon fibers wound on the rotor support before magnetizing the outer subsections and the inner subsections made of magnetic steel.

As an alternative, in the same magnetic steel unit, the volume ratio of the magnetic steel relative to the magnetic steel unit is 50%.

As an alternative scheme, be provided with a plurality of mounting grooves of arranging along circumference on the rotor support, every magnet steel unit corresponds to install in one the mounting groove, be formed with a plurality of spacing portions on the rotor support, every spacing portion is along radial spacing one inner circle magnet steel subassembly.

As an alternative scheme, the mounting groove comprises a first groove body and a second groove body which are arranged from inside to outside along the radial direction, the rotor support forms the limiting part between the first groove body and the second groove body, and at least part of the outer peripheral surface of the inner ring magnetic steel assembly is in butt joint with the limiting part.

The second objective of the present invention is to provide a method for manufacturing a rotor of an axial field motor, which is used for manufacturing the rotor, so that the amount of magnetic steel can be reduced, the manufacturing cost can be reduced, the magnetic steel can be integrally magnetized, and the manufacturing efficiency of the rotor can be improved.

To achieve the purpose, the invention adopts the following technical scheme:

A method for manufacturing a rotor of an axial magnetic field motor is used for manufacturing the rotor of the axial magnetic field motor, and comprises the following steps:

Setting each inner ring magnetic steel component to comprise two inner subsections, wherein one of the inner ring magnetic steel components is magnetic steel, the other is a magnetizer, and setting each outer ring magnetic steel component to comprise two outer subsections, wherein one of the outer ring magnetic steel components is magnetic steel, and the other is a magnetizer;

Mounting a plurality of outer ring magnetic steel components on a rotor bracket, and ensuring that one of two circumferentially adjacent outer subsections is magnetic steel and the other is a magnetizer on the same side of the rotor bracket;

Mounting a plurality of inner ring magnetic steel components on the rotor support, and ensuring that one of two circumferentially adjacent inner subsections is magnetic steel and the other is a magnetizer on the same side of the rotor support;

Carrying out integral magnetization on the magnetic steel in the inner ring magnetic steel components and/or the magnetic steel in the outer ring magnetic steel components;

and forming a fixing ring on the periphery of the rotor support so as to radially restrain a plurality of outer ring magnetic steel components.

As an alternative scheme, before the magnetic steel in the outer ring magnetic steel component and the magnetic steel in the inner ring magnetic steel component are magnetized integrally, carbon fibers are wound on the periphery of the rotor support to form the fixing ring in a compression molding mode.

A third object of the present invention is to provide an axial field motor, which is low in manufacturing cost by providing the rotor.

To achieve the purpose, the invention adopts the following technical scheme:

an axial field motor includes a stator and a rotor.

The rotor of the axial magnetic field motor has the beneficial effects that:

(1) The magnetic steel units are radially segmented and axially segmented, at least one subsection of each magnetic steel unit is made of magnetic steel, the rest subsections are made of magnetic conductors, and the magnetic resistances of the magnetic conductors are small, so that the magnetic conductors are equivalent to the magnetic magnets, the magnetic magnets are false magnetic steels, the consumption of the magnetic steels is reduced to a large extent on the premise of sacrificing less magnetic flux, and the cost of the magnetic conductors is far lower than that of the magnetic steels, so that the manufacturing cost of the rotor is reduced.

(2) Through reasonably arranging the inner subsections of the inner ring magnetic steel component and the outer subsections of the outer ring magnetic steel component, the magnetic steel in the inner ring magnetic steel component and the magnetic steel in the outer ring magnetic steel component can be wholly magnetized, so that the manufacturing efficiency of the rotor is improved.

(3) By making the volume ratio of the magnetic steel relative to the magnetic steel unit in the same magnetic steel unit be 50%, the consumption of the magnetic steel is reduced as much as possible on the premise of reducing the magnetic flux loss as much as possible, and the manufacturing cost of the rotor is reduced.

The method for manufacturing the rotor of the axial magnetic field motor is used for manufacturing the rotor, so that the magnetic steel consumption can be reduced, the manufacturing cost can be reduced, the magnetic steel can be integrally magnetized, and the manufacturing efficiency of the rotor is improved.

The axial magnetic field motor reduces the manufacturing cost by arranging the rotor.

Drawings

FIG. 1 is a schematic diagram of a rotor of an axial field motor provided in the prior art;

Fig. 2 is a schematic structural diagram of a rotor of an axial field motor according to a first embodiment of the present invention;

Fig. 3 is a schematic structural diagram of a magnetic steel unit and a rotor support according to a first embodiment of the present invention;

fig. 4 is a schematic structural diagram of another magnetic steel unit after being arranged according to the first embodiment of the present invention;

FIG. 5 is a rotor according to a first embodiment of the present invention;

Fig. 6 is a schematic structural diagram of a rotor of an axial field motor according to a first embodiment of the present invention;

Fig. 7 is a schematic structural diagram of a rotor of a first axial field motor according to a second embodiment of the present invention;

Fig. 8 is a schematic structural diagram of a rotor assembly process of a first axial field motor according to a second embodiment of the present invention;

Fig. 9 is a schematic structural diagram of a rotor assembly process of a second axial field motor according to a second embodiment of the present invention.

In the figure:

1', a rotor support; 11', mounting slots; 2', magnetic steel; 3', a fixing ring;

1. A rotor bracket; 11. a mounting groove; 111. a first tank body; 112. a second tank body; 12. a limit part; 15. a first protrusion; 16. a second protrusion;

2. A fixing ring;

3. A magnetic steel unit; 31. an inner ring magnetic steel assembly; 311. an inner subsection; 312. a first groove; 32. an outer ring magnetic steel assembly; 321. an outer subsection; 322. and a second groove.

Detailed Description

The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.

In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

Example 1

The embodiment provides a rotor of an axial magnetic field motor and the axial magnetic field motor. The axial magnetic field motor comprises at least one stator and a rotor of the axial magnetic field motor. In some embodiments, the axial field motor may also be a rotor provided with two stators and one axial field motor as described above. In some embodiments, the axial field motor may further be a rotor and a stator of the two axial field motors. The rotor of the axial magnetic field motor in the embodiment reduces the dosage of the magnetic steel to a larger extent on the premise of sacrificing less magnetic flux, and reduces the manufacturing cost of the rotor. The axial magnetic field motor reduces the production cost by arranging the rotor.

As shown in fig. 2, the rotor of the axial field motor includes a rotor bracket 1, a plurality of magnetic steel units 3, and a fixing ring 2. The rotor bracket 1 has a circular outline, and a plurality of mounting grooves 11 are formed in the rotor bracket 1 along the circumferential direction thereof. Preferably, the plurality of mounting grooves 11 are uniformly distributed in the circumferential direction of the rotor frame 1. Each magnetic steel unit 3 is correspondingly arranged in one mounting groove 11. The magnetic steel unit 3 comprises an inner ring magnetic steel assembly 31 and an outer ring magnetic steel assembly 32 which are distributed along the radial direction, the inner ring magnetic steel assembly 31 is axially divided into at least one inner sub-section 311, the outer ring magnetic steel assembly 32 is axially divided into at least one outer sub-section 321, at least one of the inner sub-section 311 and the outer sub-section 321 in the same magnetic steel unit 3 is magnetic steel, and the rest is a magnetizer.

In the rotor of this embodiment, the magnetic steel units 3 are radially segmented and axially segmented, and at least one subsection of each magnetic steel unit 3 is made of magnetic steel, and the rest subsections are made of magnetic conductors, so that the magnetic resistances of the magnetic conductors are very small, which is equivalent to forming a 'false magnetic steel', and the dosage of the magnetic steel is greatly reduced on the premise of sacrificing less magnetic flux, and the cost of the magnetic conductors is far lower than that of the magnetic steel, so that the manufacturing cost of the rotor is reduced.

In this embodiment, the mounting groove 11 penetrates to the circumferential surface of the rotor bracket 1, thereby facilitating the mounting of the outer ring magnetic steel assembly 32.

As a preferred embodiment, in each magnet steel unit 3, the volume of the magnet steel is 50% of the total volume of the magnet steel unit 3. It will be appreciated that as the amount of magnet steel decreases, the magnetic flux at each magnet steel unit 3, the torque and power of the motor produced by the rotor will decrease. Experiments prove that when the dosage of the magnetic steel is halved, the magnetic flux at each magnetic steel unit 3 can be kept at 80% -85% of the full magnetic steel scheme (namely the whole magnetic steel unit 3 is made of the magnetic steel), and the torque and the power of the motor manufactured by the rotor can reach 80% -90% of the full magnetic steel scheme. That is, by controlling the volume ratio of the magnetic steel relative to the magnetic steel unit 3, the amount of the magnetic steel can be reduced to a greater extent on the premise of sacrificing less magnetic flux, and the manufacturing cost of the rotor and the axial field motor can be reduced. Alternatively, the magnetic conductor is made of a soft magnetic material such as silicon steel or other material having high magnetic permeability. Alternatively, the rotor support 1 is preferably made of a non-magnetically conductive material.

In some embodiments, as shown in fig. 3, the inner ring magnetic steel assembly 31 is axially divided into two inner sub-segments 311, while the outer ring magnetic steel assembly 32 is not segmented. In actual operation, only one of the inner subsections 311 can be selected to be made of magnetic steel according to actual needs; or only two inner subsections 311 are made of magnetic steel; or only the outer ring magnetic steel assembly 32 is made of magnetic steel.

In this embodiment, as shown in fig. 4, the inner ring magnetic steel assembly 31 is axially divided into two inner sub-sections 311, wherein one inner sub-section 311 is made of a magnetic conductor, and the other inner sub-section 311 is made of magnetic steel. The outer ring magnetic steel assembly 32 is axially divided into two outer sub-sections 321, wherein one outer sub-section 321 is made of a magnetizer, and the other outer sub-section 321 is made of magnetic steel. The arrangement is convenient to realize in one magnetic steel unit 3, the volume ratio of the magnetic steel is 50%, and then the rotor obtains higher magnetic flux under the condition of lower cost. It can be appreciated that in other embodiments, the manufacturing materials of the inner sub-section 311 and the outer sub-section 321 may be flexibly adjusted according to actual requirements, so as to adjust the volume ratio of the magnetic steel relative to the whole magnetic steel unit 3, which is not limited herein. Alternatively, the two inner subsections 311 of the inner ring magnetic steel assembly 31 are magnetically connected, and can be bonded by magnetic conductive glue. The two outer subsections 321 of the outer ring magnetic steel component 32 are connected by magnetic attraction and can be bonded by magnetic conductive glue.

For the rotor of full magnetic steel scheme (namely, the whole magnetic steel unit 3 is made of magnetic steel), the distance between two circumferentially adjacent magnetic steels is relatively short, and the clamp of the existing magnetizing equipment can not clamp the two adjacent magnetic steels at the same time, so that a plurality of magnetic steels of the rotor can not be magnetized integrally, the manufacturing difficulty of the rotor is increased, and the manufacturing efficiency of the rotor is reduced.

In this regard, in some embodiments, on the same side of the rotor support 1, one of the two circumferentially adjacent inner subsections 311 is magnetic steel, and the other is a magnetizer. Therefore, on the same side of the rotor support 1, the inner subsections 311 (i.e., the magnetic steels) to be magnetized are in a state of being arranged at intervals, namely, the distance between two adjacent magnetic steels is increased, so that the fixture of the existing magnetizing equipment can magnetize the magnetic steels of the inner ring magnetic steel assemblies 31 integrally at the same time, the manufacturing difficulty of the rotor is reduced, and the manufacturing efficiency of the rotor is improved.

In some embodiments, on the same side of the rotor support 1, one of the two circumferentially adjacent outer subsections 321 is magnetic steel, and the other is a magnetizer. Therefore, on the same side of the rotor support 1, the outer subsections 321 (i.e. the magnetic steels) to be magnetized are in a state of being arranged at intervals, namely, the distance between two adjacent magnetic steels is increased, so that the fixture of the existing magnetizing equipment can integrally magnetize the magnetic steels of the outer ring magnetic steel assemblies 32 at the same time, the manufacturing difficulty of the rotor is reduced, and the manufacturing efficiency of the rotor is improved.

In some embodiments, on the same side of the rotor support 1, one of the two circumferentially adjacent inner subsections 311 is magnetic steel, and the other is a magnetizer. Meanwhile, on the same side of the rotor support 1, one of two adjacent outer subsections 321 along the circumferential direction is magnetic steel, and the other is a magnetizer. In this embodiment, the magnetic steel of the inner ring magnetic steel assembly 31 and the magnetic steel of the outer ring magnetic steel assembly 32 can be magnetized integrally at the same time, so as to further improve the manufacturing efficiency of the rotor.

In some embodiments, after the inner ring magnetic steel assembly 31 and the outer ring magnetic steel assembly 32 are both mounted on the rotor support 1, the formed fixing ring 2 is sleeved on the rotor support 1, so that the plurality of magnetic steel units 3 are radially restrained to overcome the centrifugal force when the magnetic steel units 3 rotate.

In the prior art, after the inner ring magnetic steel assembly 31 and the outer ring magnetic steel assembly 32 are mounted on the rotor support 1, the fixing ring 2 is directly formed on the rotor support 1 by a compression molding method. Because the magnet steel unit 3 is the state after magnetizing, if the shaping temperature of solid fixed ring 2 is too high then can lead to magnet steel unit 3 demagnetization, consequently gu fixed ring 2 fashioned temperature has the restriction, and gu the pretightning force of fixed ring 2 after the shaping is also limited, and then leads to gu fixed ring 2 to magnet steel unit 3 can provide radial constraint force limited, can't satisfy the high-speed operation of rotor.

Preferably, in this embodiment, the fixing ring 2 is formed by solidifying a plurality of layers of carbon fibers wound around the rotor support 1 before magnetizing the outer segment 321 made of magnetic steel. Because the fixed ring 2 is carried out before the magnetic steel is magnetized, the forming temperature of the fixed ring 2 is not limited, and therefore, higher pretightening force, namely higher radial constraint, can be provided for the magnetic steel unit 3, so that the rotor and the motor can meet the application of high speed.

The embodiment also provides a method for manufacturing a rotor of an axial magnetic field motor, which is used for manufacturing the rotor, and the method for manufacturing the rotor of the axial magnetic field motor comprises the following steps:

Each inner ring magnetic steel component 31 comprises two inner subsections 311, one of which is magnetic steel, the other of which is a magnetizer, and each outer ring magnetic steel component 32 comprises two outer subsections 321, one of which is magnetic steel, and the other of which is a magnetizer;

mounting a plurality of outer ring magnetic steel components 32 on the rotor support 1, and ensuring that one of two circumferentially adjacent outer subsections 321 is magnetic steel and the other is a magnetizer on the same side of the rotor support 1;

a plurality of inner ring magnetic steel components 31 are mounted on the rotor support 1, and one of two circumferentially adjacent inner sub-sections 311 is magnetic steel, and the other is a magnetizer on the same side of the rotor support 1;

Carrying out integral magnetization on the magnetic steel in the plurality of inner ring magnetic steel components 31 and/or the magnetic steel in the plurality of outer ring magnetic steel components 32;

a fixing ring 2 is formed at the outer circumference of the rotor holder 1 to radially restrain a plurality of outer ring magnetic steel assemblies 32.

According to the manufacturing method of the rotor of the axial magnetic field motor, the inner ring magnetic steel component 31 and the outer ring magnetic steel component 32 are respectively formed by two subsections, and on the same side of the rotor support 1, the magnetic steels needing to be magnetized of the inner ring magnetic steel component 31 are arranged at intervals, and the magnetic steels needing to be magnetized of the outer ring magnetic steel component 32 are arranged at intervals, so that the whole magnetization of the inner ring magnetic steel component 31 and/or the outer ring magnetic steel component 32 can be realized, and the manufacturing efficiency of the rotor is improved.

Preferably, before the magnetic steel in the plurality of outer ring magnetic steel assemblies 32 is integrally magnetized, carbon fibers are wound around the outer circumference of the rotor support 1 to mold the fixing ring 2. Because the fixed ring 2 is carried out before the magnetic steel is magnetized, the forming temperature of the fixed ring 2 is not limited, and therefore, higher pretightening force, namely higher radial constraint, can be provided for the magnetic steel unit 3, so that the rotor and the motor can meet the application of high speed.

In some embodiments, as shown in fig. 5, the rotor assembly steps are:

(1) Mounting a plurality of outer ring magnetic steel components 32 (the outer subsections 321 made of magnetic steel are not magnetized at this time) on the rotor bracket 1;

(2) Carbon fiber is wound on the periphery of the rotor bracket 1 to form a fixed ring 2 in a compression molding mode;

(3) Mounting a plurality of inner ring magnetic steel components 31 (at this time, the inner sub-segments 311 made of magnetic steel are not magnetized) on the rotor bracket 1;

(4) The magnetic steels of the inner ring magnetic steel assembly 31 and the outer ring magnetic steel assembly 32 are integrally magnetized.

It should be noted that, in some embodiments, as shown in fig. 6, the assembling steps of the rotor may further be:

(1) A plurality of inner ring magnetic steel components 31 and a plurality of outer ring magnetic steel components 32 are arranged on the rotor bracket 1 (all the magnetic steels are not magnetized at the moment);

(2) Carbon fiber is wound on the periphery of the rotor bracket 1 to form a fixed ring 2 in a compression molding mode;

(3) The magnetic steels of the inner ring magnetic steel assembly 31 and the outer ring magnetic steel assembly 32 are integrally magnetized.

Example two

The present embodiment provides a rotor of an axial magnetic field motor, which has the same inventive concept as that of the first embodiment, and the same features are not described herein, and the difference is that the rotor support 1 is provided with a limiting portion 12, specifically, as shown in fig. 7 and 8, the rotor support 1 is formed with a plurality of limiting portions 12, and each limiting portion 12 radially limits one inner ring magnetic steel assembly 31. The limiting part 12 on the rotor bracket 1 can radially restrict the inner ring magnetic steel assembly 31 to overcome the centrifugal force during rotation, and the fixing ring 2 can radially restrict the outer ring magnetic steel assembly 32 to overcome the centrifugal force during rotation. The rotor provides radial constraint for the magnetic steel unit 3 in a partitioning way, namely, the rotor bracket 1 shares part of centrifugal force of the magnetic steel unit 3, so that constraint for the outer ring magnetic steel component 32 rotating at a higher speed can be realized on the premise of a certain constraint force of the fixed ring 2, and the whole rotor can meet the effective constraint for the magnetic steel unit 3 rotating at the higher speed so as to adapt to the high-speed application of the axial magnetic field motor.

As shown in fig. 8, the mounting groove 11 includes a first groove body 111 and a second groove body 112 arranged from inside to outside in the radial direction, the inner ring magnetic steel assembly 31 is mounted on the first groove body 111, and the outer ring magnetic steel assembly 32 is mounted on the second groove body 112. The rotor bracket 1 forms a limiting portion 12 between the first groove body 111 and the second groove body 112, and at least part of the outer peripheral surface of the inner ring magnetic steel assembly 31 is abutted against the limiting portion 12. By arranging the mounting groove 11 to be composed of two groove bodies, it is convenient to not only support the spacing inner ring magnetic steel assembly 31 and the outer ring magnetic steel assembly 32 respectively, but also form the spacing portion 12 on the rotor bracket 1. In this embodiment, the first groove 111 and the second groove 112 are each configured in a fan ring structure.

In some embodiments, as shown in fig. 7 and 8, in the present embodiment, the first groove body 111 and the second groove body 112 are communicated, the outer ring circumference of the first groove body 111 is larger than the inner ring circumference of the second groove body 112, so as to form a stepped limiting portion 12, and the outer ring circumference of the inner ring magnetic steel assembly 31 abuts against the stepped limiting portion 12, so that the limiting portion 12 radially constrains the inner ring magnetic steel assembly 31. Preferably, the two ends of the outer ring of the first groove 111 form the steps along the circumferential direction, and respectively prop against the two ends of the circumferential surface of the inner ring magnetic steel assembly 31, so that the stress of the inner ring magnetic steel assembly 31 is more uniform, and the inner ring magnetic steel assembly 31 is effectively restrained when the rotor rotates at a high speed.

As shown in fig. 8, in the present embodiment, the first groove 111 is parallel to both the radial side wall and the side wall of the inner ring magnetic steel assembly 31, one of which is provided with the first protrusion 15, and the other of which is provided with the first groove 312, and the first protrusion 15 is snap-fitted with the first groove 312. Through the cooperation of first arch 15 and first recess 312, make rotor support 1 realized the axial spacing to inner circle magnet steel subassembly 31, and then make the structure of whole rotor more firm, avoid the rotor to scatter the frame at the high-speed rotation process. In this embodiment, the two side walls of the first groove 111 are provided with first protrusions 15, the two side walls of the inner ring magnetic steel assembly 31 are provided with first grooves 312, and each first protrusion 15 is engaged with one first groove 312.

Likewise, the second groove 112 is parallel to both the radial side wall and the side wall of the outer ring magnetic steel assembly 32, one of which is provided with the second protrusion 16, and the other is provided with the second groove 322, and the second protrusion 16 is in snap fit with the second groove 322. Through the cooperation of second arch 16 and second recess 322, make rotor support 1 realize axial spacing to outer circle magnet steel subassembly 32, and then further increased the structural integrity of whole rotor, avoid the rotor to scatter the frame at high-speed rotation process. In this embodiment, the two side walls of the second slot body 112 are provided with second protrusions 16, the two side walls of the outer ring magnetic steel assembly 32 are provided with second grooves 322, and each second protrusion 16 is in clamping fit with one second groove 322.

In some embodiments, as shown in fig. 9, the first groove body 111 and the second groove body 112 are not communicated, the solid structure between the first groove body 111 and the second groove body 112 forms the limiting portions 12, and each limiting portion 12 is the same as the corresponding circumferential extending track of the inner ring magnetic steel assembly 31, that is, the outer ring circumferential surface of the inner ring magnetic steel assembly 31 is correspondingly and completely attached to one limiting portion 12, so that radial constraint can be provided for the inner ring magnetic steel assembly 31 more stably and uniformly to overcome the centrifugal force during rotation, and the structure of the rotor is more stable and reliable during high-speed rotation. As shown in fig. 9, the plurality of limiting parts 12 are combined to form a ring-shaped structure, and the structure enables the structural strength of the rotor support 1 to be better, so that the problem that the rotor is scattered when rotating at a high speed is avoided.

It is to be understood that the foregoing examples of the invention are provided for the purpose of illustration only and are not intended to limit the scope of the invention, which is defined by the claims, since modifications in both the detailed description and the application scope of the invention will become apparent to those skilled in the art upon consideration of the teachings of the invention. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.

Claims (10)

1. The utility model provides an axial field motor's rotor, includes rotor support (1), a plurality of magnet steel unit (3) and solid fixed ring (2), a plurality of magnet steel unit (3) set up and support in along circumference interval rotor support (1), gu fixed ring (2) are encircled and are located rotor support (1) periphery and radial constraint magnet steel unit (3), its characterized in that:

the magnetic steel unit (3) comprises an inner ring magnetic steel assembly (31) and an outer ring magnetic steel assembly (32) which are distributed along the radial direction, wherein the inner ring magnetic steel assembly (31) is axially divided into at least one inner subsection (311), the outer ring magnetic steel assembly (32) is axially divided into at least one outer subsection (321), at least one of the inner subsection (311) and the outer subsection (321) in the same magnetic steel unit (3) is magnetic steel, and the rest is a magnetizer.

2. The rotor of an axial field electric machine according to claim 1, characterized in that the inner ring magnetic steel assembly (31) is axially divided into at least two inner subsections (311), one of the two circumferentially adjacent inner subsections (311) being magnetic steel and the other being a magnetizer; and/or

The outer ring magnetic steel assembly (32) is axially divided into at least two outer subsections (321), one of the two circumferentially adjacent outer subsections (321) is magnetic steel, and the other is a magnetizer.

3. A rotor of an axial field electric machine according to claim 2, characterized in that on the same side of the rotor support (1), one of the two circumferentially adjacent inner subsections (311) is magnetic steel and the other is a magnetizer; and/or the same side of the rotor support (1), wherein one of the two adjacent outer subsections (321) along the circumferential direction is magnetic steel, and the other is a magnetizer.

4. The rotor of an axial field electric machine according to claim 2, characterized in that the fixing ring (2) is solidified and formed by a plurality of layers of carbon fibers wound around the rotor support (1) before magnetizing the outer sub-section (321) and the inner sub-section (311) made of magnetic steel.

5. A rotor of an axial field electric machine according to claim 1, characterized in that in the same magnet steel unit (3), the volume ratio of magnet steel with respect to the magnet steel unit (3) is 50%.

6. A rotor of an axial field electric machine according to any of claims 1-5, characterized in that a plurality of circumferentially arranged mounting grooves (11) are provided on the rotor support (1), each of the magnet steel units (3) is correspondingly mounted to one of the mounting grooves (11), a plurality of limiting portions (12) are formed on the rotor support (1), and each of the limiting portions (12) radially limits one of the inner ring magnet steel assemblies (31).

7. The rotor of an axial field motor according to claim 6, wherein the mounting groove (11) includes a first groove body (111) and a second groove body (112) arranged from inside to outside in a radial direction, the rotor bracket (1) forms the limit portion (12) between the first groove body (111) and the second groove body (112), and at least a part of an outer peripheral surface of the inner ring magnetic steel assembly (31) abuts against the limit portion (12).

8. A method of manufacturing a rotor of an axial field motor for manufacturing a rotor of an axial field motor according to any one of claims 1 to 7, comprising the steps of:

Each inner ring magnetic steel component (31) comprises two inner subsections (311), one of the inner ring magnetic steel components is magnetic steel, the other inner ring magnetic steel component is a magnetizer, each outer ring magnetic steel component (32) comprises two outer subsections (321), and one inner ring magnetic steel component is magnetic steel, and the other outer ring magnetic steel component is a magnetizer;

Mounting a plurality of outer ring magnetic steel assemblies (32) on a rotor bracket (1) and ensuring that one of two circumferentially adjacent outer subsections (321) is magnetic steel and the other is a magnetizer on the same side of the rotor bracket (1);

mounting a plurality of inner ring magnetic steel assemblies (31) on the rotor support (1) and ensuring that one of two circumferentially adjacent inner subsections (311) is magnetic steel and the other is a magnetizer on the same side of the rotor support (1);

Carrying out integral magnetization on the magnetic steel in the inner ring magnetic steel assemblies (31) and/or the magnetic steel in the outer ring magnetic steel assemblies (32);

and forming a fixed ring (2) on the periphery of the rotor bracket (1) so as to radially restrain a plurality of outer ring magnetic steel components (32).

9. The method of manufacturing a rotor of an axial field motor as defined in claim 8, wherein: before the magnetic steel in the outer ring magnetic steel component (32) and the magnetic steel in the inner ring magnetic steel component (31) are magnetized integrally, carbon fibers are wound on the periphery of the rotor support (1) to form the fixing ring (2) in a compression molding mode.

10. An axial field motor comprising a stator and a rotor as claimed in any one of claims 1 to 6.