CN110994842B - High-performance permanent magnet brushless motor with internal magnetism gathering characteristic - Google Patents

High-performance permanent magnet brushless motor with internal magnetism gathering characteristic Download PDF

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Publication number
CN110994842B
CN110994842B CN201911345876.9A CN201911345876A CN110994842B CN 110994842 B CN110994842 B CN 110994842B CN 201911345876 A CN201911345876 A CN 201911345876A CN 110994842 B CN110994842 B CN 110994842B
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China
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tile
magnet
permanent magnet
annular
arc surface
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CN201911345876.9A
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CN110994842A (en
Inventor
胡佳
翁孟坤
张贝妮
刘健
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Once Top Motor Manufacture Co ltd
Wuhan Wanzhida Intelligent Technology Co ltd
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Once Top Motor Manufacture Co ltd
Wuhan Wanzhida Intelligent Technology Co ltd
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Publication of CN110994842A publication Critical patent/CN110994842A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2786—Outer rotors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
    • H02K1/187—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures to inner stators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/46—Fastening of windings on the stator or rotor structure
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/02—Casings or enclosures characterised by the material thereof
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/161—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields radially supporting the rotary shaft at both ends of the rotor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2203/00—Specific aspects not provided for in the other groups of this subclass relating to the windings
    • H02K2203/12—Machines characterised by the bobbins for supporting the windings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information

Abstract

The invention discloses a high-performance permanent magnet brushless motor with internal magnetism-gathering property, which comprises a stator assembly, an armature assembly and a rotor assembly, wherein the stator assembly comprises a base and a main bearing; for any two adjacent tile magnets A, the magnetizing direction of one tile magnet A is that the inner arc surface points to the outer arc surface, and the magnetizing direction of the other tile magnet A is that the outer arc surface points to the inner arc surface; the magnetizing direction of each tile magnet B is that the connecting surface C points to the connecting surface D, the connecting surface C is connected with the tile magnet A of which the magnetizing direction is the inner arc surface points to the outer arc surface, and the connecting surface D is connected with the tile magnet A of which the magnetizing direction is the outer arc surface points to the inner arc surface. The invention can provide larger air gap flux density, so that the motor has extremely high output efficiency and power density.

Description

High-performance permanent magnet brushless motor with internal magnetism gathering characteristic
Technical Field
The invention belongs to the field of permanent magnets, and particularly relates to a permanent magnet brushless motor.
Background
With the development of power electronic technology, brushless motors based on electronic commutation are widely used in various aspects of social life, and especially, permanent magnet brushless motors using ring-shaped permanent magnets as magnetic sources are favored by engineers in the engineering application field due to their advantages of high output efficiency, long service life, various structural forms, and the like. With the continuous advance of new technologies such as intelligent manufacturing and 5G application, higher requirements are put forward in various fields for the performance requirements of efficiency, volume, service life, noise and the like of the permanent magnet brushless motor, and therefore, novel motor design is at the forefront.
Specifically, in the field of conventional micro special motors (in the industry, the rated power is within 750W or the diameter is less than 160mm), a brushless motor with an output efficiency of 80% can be considered as a well-designed brushless motor, the proportion of the brushless motor with an output efficiency of 85% -90% is small, and the motor diameter can be achieved only under the condition of a relatively large diameter. Meanwhile, for brushless motors with diameters smaller than 42mm and even smaller, it seems to be a difficult technical obstacle to obtain an output efficiency of 90% or more.
In order to improve the efficiency of the motor, besides using high-performance rare earth permanent magnet materials, permanent magnet motors with a flux concentration effect are usually designed to reduce the flux leakage phenomenon so as to achieve the purpose of improving the output efficiency of the motor. At present, in the aspect of improving the magnetism gathering effect of the brushless motor, the magnetic conduction magnetic yoke with the required shape is mostly arranged in a magnetic circuit, magnetic lines of force are guided to enter an expected 'path', the magnetic conduction magnetic yoke structure is not only complex in structure, but also has higher requirements on the theoretical level of designers, the magnetic conduction magnetic yoke structure is not beneficial to wide popularization and use, and the magnetic conduction magnetic yoke also occupies a certain space and is not beneficial to miniaturization.
Disclosure of Invention
Aiming at the defects or improvement requirements of the prior art, the invention provides a high-performance permanent magnet brushless motor with internal magnetism-gathering property, which has a simple structure, does not need a magnetic conduction yoke and still has higher output efficiency under the condition of smaller external dimension.
In order to achieve the above object, according to the present invention, there is provided a high performance permanent magnet brushless motor having a coherent magnetism characteristic, comprising a stator assembly, an armature assembly and a rotor assembly, wherein the stator assembly comprises a base and a main bearing arranged on the base, the armature assembly comprises an armature framework and a ring winding, the armature framework is fixedly mounted on the base, the ring winding is mounted on the armature framework, the rotor assembly comprises a rotating shaft, a housing and a ring permanent magnet, the rotating shaft is mounted on the base through the main bearing, the housing is fixedly penetrated on the rotating shaft, the ring permanent magnet is fixedly sleeved on an inner wall of the housing and is coaxially arranged with the rotating shaft, and the ring permanent magnet surrounds the ring winding, wherein:
the annular permanent magnet comprises a plurality of tile magnets A and a plurality of tile magnets B which are alternately arranged and fixedly connected together to form the annular permanent magnet with an inner cylindrical surface and an outer cylindrical surface, each tile magnet A and each tile magnet B are formed by magnetizing parallel magnetic fields, and the radian of each tile magnet B is smaller than that of each tile magnet A;
for any two adjacent tile magnets A, the magnetizing direction of one tile magnet A is that the inner arc surface points to the outer arc surface, and the magnetizing direction of the other tile magnet A is that the outer arc surface points to the inner arc surface;
for every tile magnet B, it has connection face C and connection face D, and its direction of magnetizing is the connection face D of connecting face C point to, and connection face C is connected for the tile magnet A of the directional extrados of extrados with the direction of magnetizing, connection face D is connected for the tile magnet A of the directional extrados of extrados with the direction of magnetizing.
Preferably, for each tile magnet a, the projections of the inner arc surface and the outer arc surface of the tile magnet a on a plane perpendicular to the annular permanent magnet are an arc E and an arc F, respectively, and the direction of the parallel magnetic field for magnetizing the tile magnet a is parallel to a connecting line of the midpoints of the arc E and the arc F.
Preferably, for each tile magnet B, the projections of the connecting surface C and the connecting surface D on a plane perpendicular to the annular permanent magnet are a line segment G and a line segment H, respectively, and the direction of the parallel magnetic field for magnetizing the tile magnet B is parallel to the connecting line of the midpoints of the line segment G and the line segment H.
Preferably, the stator assembly further comprises a pre-tightening spring, one end of which presses on the main bearing and the other end presses on a step inside the base.
Preferably, the rotating shaft has an annular groove, the rotor assembly further comprises a shaft retainer ring disposed on the annular groove, the main bearing is located between the preload spring and the shaft retainer ring is in contact with the main bearing.
Preferably, the arc of each tile magnet B is 40% to 60% of the arc of each tile magnet a, respectively.
Preferably, the housing is made of aluminum alloy or plastic.
Preferably, the annular permanent magnet is pasted on the inner wall of the shell through an adhesive, and the armature framework is pasted on the base through the adhesive.
Preferably, an auxiliary bearing is further arranged on the base, and the rotating shaft penetrates through the auxiliary bearing.
Preferably, the inner wall of one end of the annular winding is fixedly sleeved on the armature framework.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
1) the high-performance permanent magnet brushless motor with the internal magnetism gathering characteristic provided by the invention has no iron core loss, and can still provide larger air gap flux density on the premise of canceling the magnetic conduction yoke, so that the motor has extremely high output efficiency and power density.
2) The high-performance permanent magnet brushless motor with the internal magnetism gathering characteristic is simple in structure, has more idle space inside, can be deeply integrated with products in different application scenes, can achieve the purpose of enabling a terminal product to be compact in structure, and is suitable for the requirements of products with small-size structures (but not limited to small-size structures).
Drawings
FIG. 1 is a schematic cross-sectional view of the present invention;
FIG. 2 is a schematic view of one of the tile magnets A of the present invention being magnetized in a parallel magnetic field;
FIG. 3 is a schematic view of one of the tile magnets B of the present invention being magnetized in a parallel magnetic field;
FIG. 4 is a schematic view of the arrangement and respective magnetization directions of tile magnets of the ring permanent magnet according to the present invention;
fig. 5 is a schematic view of the distribution of magnetic lines of force of the annular permanent magnet in the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1 to 5, a high performance permanent magnet brushless motor with internal magnetism-gathering property comprises a stator assembly 1, an armature assembly 2 and a rotor assembly 3, wherein the stator assembly 1 comprises a base 11 and a main bearing 12 arranged on the base 11, the armature assembly 2 comprises an armature framework 21 and a ring winding 22, the armature framework 21 is fixedly arranged on the base 11, the ring winding 22 is arranged on the armature framework 21, a conducting wire 23 is connected to the ring winding 22 and can be connected with an external power supply, the rotor assembly 3 comprises a rotating shaft 31, a housing 32 and a ring permanent magnet 33, the rotating shaft 31 is arranged on the base 11 through the main bearing 12, the housing 32 is fixedly penetrated on the rotating shaft 31 and coaxially arranged with the rotating shaft 31, the ring permanent magnet 33 is fixedly sleeved on the inner wall of the housing 32 and coaxially arranged with the rotating shaft 31, the annular permanent magnet 33 encloses the annular winding 22 and both are arranged coaxially, wherein:
the annular permanent magnet 33 comprises a plurality of tile magnets A331 and a plurality of tile magnets B332 which are alternately arranged and fixedly connected together to form the annular permanent magnet 33 with an inner cylindrical surface and an outer cylindrical surface, each tile magnet A331 and each tile magnet B332 are magnetized by a parallel magnetic field (refer to arrows in fig. 2 and 3, the arrows indicate magnetizing directions, namely directions of the parallel magnetic fields), and the radian β of each tile magnet B3321Are all less than eachArc beta of tile magnet A3312This allows the tile magnet A331 to provide more magnetic source and the air gap flux density of the machine to be as large as possible, preferably with the arc β of each tile magnet B3321Arc beta of each tile magnet A331240% -60% of the total weight of the motor, the percentage defines the radian proportional relationship of the tile magnet A and the tile magnet B, a basis is provided for the rapid design of the tile magnet A and the tile magnet B, meanwhile, the optimal proportional relationship can be found within the percentage range, so that the inner magnetic cohesion effect in the air gap area of the motor is optimal, the optimal value depends on the factors such as the size and the material characteristics of the annular permanent magnet 33, and the like, and is determined according to the actual situation so as to achieve the optimal inner magnetic cohesion effect.
For any two adjacent tile magnets A331, the magnetizing direction of one tile magnet A331 is that the inner arc surface points to the outer arc surface, and the magnetizing direction of the other tile magnet A331 is that the outer arc surface points to the inner arc surface, so that the design ensures that the annular permanent magnet 33 spliced into a whole can generate the effect of alternately arranging the magnetic poles N and the magnetic poles S, and the brushless motor can normally run.
For each tile magnet B332, the tile magnet B has a connecting surface C and a connecting surface D, the magnetizing direction of the tile magnet B is that the connecting surface C points to the connecting surface D, the connecting surface C is connected to the tile magnet a331 whose magnetizing direction is that the intrados points to the extrados, and the connecting surface D is connected to the tile magnet a331 whose magnetizing direction is that the extrados points to the intrados.
Through the structural design, after the tile magnet B332 and the tile magnet A331 are spliced into the integral annular permanent magnet, the magnetic field cohesion effect can be formed.
Further, for each tile magnet a331, projections of an inner arc surface and an outer arc surface of the tile magnet a331 on a plane perpendicular to the annular permanent magnet 33 are an arc E3311 and an arc F3312, respectively, and a direction of a parallel magnetic field for magnetizing the tile magnet a331 is parallel to a connecting line (see an arrow in fig. 2) of midpoints of the arc E3311 and the arc F3312, so that the air gap flux density of the annular permanent magnet 33 spliced into a whole is larger.
Further, for each tile magnet B332, the projections of the connection surface C and the connection surface D on the plane perpendicular to the annular permanent magnet 33 are a line segment G3321 and a line segment H3322, respectively, and the direction of the parallel magnetic field for magnetizing the tile magnet B332 is parallel to the connection line of the midpoints of the line segments G3321 and H3322 (see the arrow in fig. 3), so that the cohesive effect of the air gap magnetic field of the annular permanent magnet 33 spliced into a whole is better.
Further, the stator assembly 1 further comprises a pre-tightening spring 14, one end of the pre-tightening spring 14 presses on the main bearing 12, and the other end of the pre-tightening spring presses on a step inside the base 11, so that the main bearing 12 can be pre-tightened in a constant pressure along the axial direction.
Further, the rotating shaft 31 has an annular groove, the rotor assembly 3 further includes a shaft retainer 15 disposed on the annular groove, the main bearing 12 is located between the preload spring 14 and the shaft retainer 15, and the shaft retainer 15 is in contact with the main bearing 12. Preferably, the base 11 is further provided with an auxiliary bearing 13, the rotating shaft 31 penetrates through the auxiliary bearing 13, the rotating stability of the rotating shaft 31 can be guaranteed through the main bearing 12 and the auxiliary bearing 13, and the shaft retainer ring 15 is matched with the pre-tightening spring 14 for use, so that the main bearing 12 can be guaranteed to be installed in place and reasonably pre-tightened, and the accuracy, the service life and the service performance of the main bearing 12 can be improved.
The base 11 of the invention is provided with two bearing chambers along the axial direction, which are respectively a main bearing chamber and an auxiliary bearing chamber, and are used for installing a main bearing 12 and an auxiliary bearing 13, wherein a pre-tightening spring 14 on the main bearing chamber is tightly attached to the inner wall of the main bearing chamber, one end of a rotating shaft 31 is coaxially connected with a shell 32 with a central installation hole, the joint of the rotating shaft 31 and the shell 32 adopts interference fit or interference fit plus laser welding, and an annular groove at the other end of the rotating shaft 31 is matched with a shaft retainer ring 15, so that the axial fixation of the whole rotor assembly 3 can be.
Referring to fig. 4, the annular permanent magnet 33 of the present invention is formed by connecting tile magnets a331 and B332 of two sizes according to a certain arrangement, and arrows in the tile magnets a331 and B332 in fig. 4 respectively indicate respective magnetizing directions (the magnetizing directions are also directions of parallel magnetic fields for magnetizing), and the annular permanent magnet exhibits a superior inner convergence magnetic characteristic. Fig. 5 shows the distribution of magnetic lines of force on the XY plane perpendicular to the axis of the ring-shaped permanent magnet 33, and under the condition of no magnetic yoke, the magnetic lines of force formed by the ring-shaped permanent magnet 33 are mainly distributed on the inner side of the ring-shaped permanent magnet 33, i.e. the ring-shaped permanent magnet 33 has cohesiveness, while the magnetic lines of force on the outer side of the ring-shaped permanent magnet 33 are distributed very little (the magnetic field intensity is weak, and the magnetic field intensity drops rapidly in the direction extending outward), so that the air gap magnetic density of the brushless motor can be made larger, the ampere force generated by the ring-shaped winding 22 cutting the magnetic lines of force after the brushless motor is energized is larger, i.e. the brushless motor can bear.
Thanks to the internal magnetism-gathering property of the annular permanent magnet 33, the motor does not need to be provided with a magnetic yoke, so the shell 32 can be made of non-magnetic metal or non-metal materials, the shell 32 can be made of aluminum alloy or plastic with light density for the purpose of reducing the inertia of the rotor assembly 3, and can be manufactured by adopting a machining or die sinking process, meanwhile, the shell 32 can support the annular permanent magnet 33 formed by combining the tile magnet A331 and the tile magnet B332, the annular permanent magnet 33 is prevented from falling off due to centrifugal force in the high-speed rotation process, and the annular permanent magnet 33 is adhered to the inner wall of the shell 32 through a high-strength adhesive.
The inner wall of one end of an annular winding 22 of the armature component 2 is sleeved on an insulated armature framework 21, the joint of the armature framework and the insulated armature framework is adhered together by adopting a high-strength adhesive, the armature framework 21 can be sleeved on a base 11 in the stator component 1 and is fixedly adhered, the annular winding 22 is arranged near the inner side wall of the annular permanent magnet 33, a magnetic field gathered at the inner side of the annular permanent magnet 33 forms a higher magnetic field strength area, and the electrified annular winding 22 is arranged in the high-strength magnetic field of the annular permanent magnet 33 to cut magnetic lines of force to generate higher torque output. Because the annular permanent magnet 33 has the internal magnetism-gathering property, the invention can still provide high air gap flux density without using a magnetic yoke, and the magnetic yoke is usually inconvenient to be formed by using a die process and has high manufacturing cost; in addition, the annular permanent magnet 33 is a part of the rotor assembly 3 in the brushless motor, which is rotatable, and there is no N-pole or S-pole alternation inside the metal parts of the rotor assembly 3 that are relatively stationary with respect to the annular permanent magnet 33, so that the brushless motor has no iron loss, and thus has higher output efficiency than a common brushless motor.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (7)

1. The utility model provides a high performance permanent magnet brushless motor who possesses interior magnetism characteristic, its characterized in that includes stator module, armature assembly and rotor subassembly, stator module includes the base and sets up the base bearing on this base, armature assembly includes armature skeleton and annular winding, armature skeleton fixed mounting is on this base, annular winding installs on this armature skeleton, rotor subassembly includes pivot, shell and annular permanent magnet, the pivot is installed on this base through this base bearing, the shell is fixed to wear to adorn in this pivot, the fixed suit of annular permanent magnet is on the inner wall of this shell and with the coaxial setting of this pivot, this annular winding is enclosed to annular permanent magnet, wherein:
the annular permanent magnet comprises a plurality of tile magnets A and a plurality of tile magnets B which are alternately arranged and fixedly connected together to form the annular permanent magnet with an inner cylindrical surface and an outer cylindrical surface, each tile magnet A and each tile magnet B are formed by magnetizing parallel magnetic fields, and the radian of each tile magnet B is smaller than that of each tile magnet A;
for any two adjacent tile magnets A, the magnetizing direction of one tile magnet A is that the inner arc surface points to the outer arc surface, and the magnetizing direction of the other tile magnet A is that the outer arc surface points to the inner arc surface;
for each tile magnet A, the projections of the inner arc surface and the outer arc surface of the tile magnet A on a plane vertical to the annular permanent magnet are respectively an arc E and an arc F, and the direction of a parallel magnetic field for magnetizing the tile magnet A is parallel to a connecting line of the midpoints of the arc E and the arc F;
for each tile magnet B, the tile magnet B is provided with a connecting surface C and a connecting surface D, the magnetizing direction of the tile magnet B is that the connecting surface C points to the connecting surface D, the connecting surface C is connected with the tile magnet A, the magnetizing direction of the tile magnet A points to an outer arc surface, and the connecting surface D is connected with the tile magnet A, the magnetizing direction of the tile magnet A points to the inner arc surface, of an outer arc surface;
for each tile magnet B, the projections of the connecting surface C and the connecting surface D on a plane vertical to the annular permanent magnet are a line segment G and a line segment H respectively, and the direction of the parallel magnetic field for magnetizing the tile magnet B is parallel to the connecting line of the midpoints of the line segment G and the line segment H;
the radian of each tile magnet B is 40% -60% of the radian of each tile magnet A;
the magnetic force lines formed by the annular permanent magnet are mainly distributed on the inner side of the annular permanent magnet, namely the annular permanent magnet has cohesiveness, and the magnetic force lines on the outer side of the annular permanent magnet are distributed a little, so that the air gap flux density of the brushless motor is large, the ampere force generated by cutting the magnetic force lines by the annular winding after the brushless motor is electrified is large, and the brushless motor can bear large load torque.
2. The brushless permanent magnet motor according to claim 1, wherein the stator assembly further comprises a pre-load spring, one end of the pre-load spring presses against the main bearing and the other end presses against a step inside the base.
3. The brushless permanent magnet motor of claim 2 wherein the shaft has an annular groove, and the rotor assembly further comprises a shaft retainer ring disposed in the annular groove, the main bearing being located between the preload spring and the shaft retainer ring contacting the main bearing.
4. The brushless permanent magnet motor according to claim 1, wherein the housing is made of aluminum alloy or plastic.
5. The brushless permanent magnet motor according to claim 1, wherein the ring-shaped permanent magnet is adhered to the inner wall of the housing by an adhesive, and the armature frame is adhered to the base by an adhesive.
6. The brushless permanent magnet motor according to claim 1, wherein an auxiliary bearing is further disposed on the base, and the rotating shaft passes through the auxiliary bearing.
7. The brushless permanent magnet motor with internal magnetism according to claim 1, wherein the inner wall of one end of the annular winding is fixedly sleeved on the armature framework.
CN201911345876.9A 2019-12-24 2019-12-24 High-performance permanent magnet brushless motor with internal magnetism gathering characteristic Active CN110994842B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201846141U (en) * 2010-09-17 2011-05-25 张习斌 Permanent magnetic ironless motor with axial magnet field and magnetic flux gathering function
CN102075041B (en) * 2010-11-25 2012-07-04 西安交通大学 Transverse flux torque motor with V-shaped air gaps forcedly cooled by fluid
CN103457424A (en) * 2013-05-17 2013-12-18 湖南大学 Double-rotor iron-core-free permanent-magnet synchronous motor
CN204089544U (en) * 2014-08-21 2015-01-07 江西工埠机械有限责任公司 External rotor electric machine
CN105375737B (en) * 2015-10-29 2017-10-31 哈尔滨工业大学 One kind improves non-salient pole type internal rotor reluctance type magnetic coupling
CN106411006B (en) * 2016-11-15 2018-07-24 华中科技大学 A kind of claw-pole structure rotor of axial flux permanent magnet body

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