CN110460175B - Axial magnetic flux concentrated winding type hybrid excitation motor - Google Patents

Axial magnetic flux concentrated winding type hybrid excitation motor Download PDF

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Publication number
CN110460175B
CN110460175B CN201910683071.9A CN201910683071A CN110460175B CN 110460175 B CN110460175 B CN 110460175B CN 201910683071 A CN201910683071 A CN 201910683071A CN 110460175 B CN110460175 B CN 110460175B
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stator
magnetic
winding
excitation
ring
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CN110460175A (en
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耿伟伟
张卓然
李强
蒋雪峰
孙乐
王晨
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Nanjing University of Science and Technology
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Nanjing University of Science and Technology
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K1/00Details of the magnetic circuit
    • H02K1/06Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12Stationary parts of the magnetic circuit
    • H02K1/16Stator cores with slots for windings
    • H02K1/165Shape, form or location of the slots
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K1/00Details of the magnetic circuit
    • H02K1/06Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22Rotating parts of the magnetic circuit
    • H02K1/27Rotor cores with permanent magnets
    • H02K1/2793Rotors axially facing stators
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K16/00Machines with more than one rotor or stator
    • H02K16/02Machines with one stator and two or more rotors
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K21/00Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/02Details
    • H02K21/04Windings on magnets for additional excitation ; Windings and magnets for additional excitation
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K21/00Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/24Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets axially facing the armatures, e.g. hub-type cycle dynamos
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K3/00Details of windings
    • H02K3/04Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/28Layout of windings or of connections between windings
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/64Electric machine technologies in electromobility

Abstract

The invention discloses an axial magnetic flux concentrated winding type hybrid excitation motor. The motor comprises a stator disc and two rotor discs, wherein the stator disc comprises a stator core, an armature winding, an excitation winding and a magnetic conduction ring, and the rotor discs comprise rotor back yokes, magnetic conduction pole blocks and permanent magnets; stator slots are formed in the left side and the right side of a stator core of the stator disc, and armature windings are mounted on a magnetic yoke of the stator core; the two rotor disks are respectively arranged at two sides of the stator disk, and the number of rotor poles is matched with the number of stator slots to form a concentrated winding motor structure; permanent magnets and magnetic pole pieces are alternately arranged on the rotor disks, the two rotor disks are staggered with one pole and are arranged on two sides of the stator disk, wherein the magnetic pole pieces extend to the outer ring in the radial direction and form an additional air gap of an excitation magnetic field with the magnetic ring on the stator core in the axial direction. The invention has high power density and wide magnetic field adjusting range, and has important application prospect in electric automobile driving systems, hybrid power generation systems and aviation electric propulsion systems.

Description

Axial magnetic flux concentrated winding type hybrid excitation motor
Technical Field
The invention relates to the technical field of axial flux permanent magnet motors, in particular to an axial flux concentrated winding type hybrid excitation motor.
Background
The hybrid excitation motor integrates the advantages of high efficiency and high power density of a permanent magnet motor and convenience in magnetic field adjustment of an electromagnetic synchronous motor, and the advantages of the permanent magnet motor and the electromagnetic synchronous motor are brought into play to the greatest extent. By adjusting the exciting current, the flux weakening and speed expanding capability is greatly improved, and the efficiency of low-speed large-torque and high-speed flux weakening operation is obviously improved; meanwhile, the torque precision control under the low torque load can be ensured through the adjustment of the exciting current, and the short-time strong overload capacity is further improved, so that the requirements of the hub motor on the following four aspects can be well considered: firstly, the range of an efficient operation area for operating the motor body in a wide rotating speed range needs to be further expanded; strong overload and wide rotating speed flux weakening capability are simultaneously achieved; torque precision can be effectively ensured under a wide load torque variation range; and fourthly, under high-speed operation, the safety of the electric system of the whole vehicle is ensured under the counter electromotive force impact after the armature current flux weakening control fails. The axial magnetic field permanent magnet motor has the remarkable advantages of high torque density, various stator structural forms, strong overload capacity, compact axial structure and the like, and is suitable for being integrated in a vehicle hub, so that the hybrid excitation axial motor is used as a hub motor and has great application value and prospect in the field of distributed driving electric automobiles.
At present, the mixed excitation axial magnetic field motor has attracted wide attention of domestic and foreign scholars. The existing mixed excitation axial magnetic field permanent magnet motor introduces an excitation winding on the basis of the traditional axial magnetic field mixed excitation motor, or adopts a rotor magnetic shunt structure to realize brushless electric excitation, or adopts a rotor magnetic pole division type structure to add the excitation winding on a stator. For example, document 1 (synthetic stuck of new field catalysis mechanisms, E)GThe axial magnetic field hybrid excitation motor described in IET Electric Power Applications,2017) has higher torque density and better magnetic field regulation characteristics, however, the rotor of the motor of this type needs to be extended in the axial direction, the special advantage of the light and thin structure of the axial motor is lost, and it is difficult to realize integrated integration as a hub motor. The Axial magnetic Field Hybrid excitation Motor described in the journal article (Design, Analysis, and Control of Hybrid Field-Controlled Axial-Flux Permanent-Magnet Motor, meth in Aydin, sun Huang, Thomas A. lipo, IEEE Transactions on Industrial Electronics, Volume:57, Issue:1, Jan 2010. 2010) published by IEEE Transactions, Ind. ElectronCompared with a permanent magnet motor, the permanent magnet motor is greatly improved, however, the magnetic leakage of the excitation winding in the structure to the middle of the stator is large, the power density is to be further improved, and meanwhile, the installation of the excitation winding is limited to a certain extent; the dual-feed hybrid excitation axial magnetic field permanent magnet motor disclosed in patent CN200510112091 also belongs to the structural topology of the hybrid excitation motor of the type. In addition, a series of hybrid excitation flux switching axial magnetic field motors are derived from the long-term development of reluctance motors in recent years, for example, a double-H-shaped stator core, double-rotor and dual-excitation axial flux switching permanent magnet motor disclosed in patent CN201710086123 and a disc type double-stator hybrid excitation motor disclosed in patent CN201610944356 belong to the hybrid excitation flux switching axial magnetic field motors, and the hybrid excitation flux switching axial magnetic field motors have the advantages of convenience in magnetic field regulation, simple structure and the like; however, the basic principle of the motor of the type brings great challenges to the improvement of the power density and the structural strength of the motor body, the utilization rate of the iron core is low due to the adoption of magnetic flux unipolar switching, and the torque surface density level of the synchronous excitation motor is difficult to achieve.
Disclosure of Invention
The invention aims to provide an axial magnetic flux concentrated winding type hybrid excitation motor with high power density and wide magnetic field adjusting range.
The technical solution for realizing the purpose of the invention is as follows: an axial magnetic flux concentrated winding type hybrid excitation motor comprises a stator disc and two rotor discs, wherein the stator disc comprises a stator core, an armature winding, an excitation winding and a magnetic conduction ring, and the rotor discs comprise rotor back yokes, magnetic conduction pole blocks and permanent magnets;
12N stator slots are formed in the left side and the right side of a stator core of the stator disc, N is a natural number, an armature winding is installed on a magnetic yoke of the stator core, and the armature winding is of an annular structure; the excitation winding is arranged on the outer ring of the stator core or the inner ring of the stator core, or the inner ring and the outer ring of the stator core are simultaneously arranged;
the two rotor disks are respectively arranged on two sides of the stator disk, and the number of rotor poles is matched with the number of stator slots to form a concentrated winding motor structure; the permanent magnets and the magnetic conduction pole blocks are alternately arranged on the rotor disks to form a 10N-pole rotor magnetic field, the two rotor disks are staggered with one pole and are arranged on two sides of the stator disk, and the magnetic conduction pole blocks extend towards the outer ring in the radial direction and form an additional air gap of the excitation magnetic field with the magnetic conduction ring on the stator iron core in the axial direction.
As a specific example, the stator iron core has the same stator slot shape and number, and is formed by winding a silicon steel sheet steel strip or by die-casting a soft magnetic composite material.
As a specific example, the stator core adopts a modular structure, and the thickness of the stator bar reserved by the slots on the stator core is the same as that of the stator teeth.
As a specific example, when the excitation winding is installed on the outer ring of the armature winding, the magnetic conductive ring is installed on the outer ring of the excitation winding, and when the excitation winding is installed on the inner ring of the armature winding, the magnetic conductive ring is installed on the inner ring of the excitation winding; when the inner and outer rings of the stator core are simultaneously provided with the excitation windings, the magnetic conduction ring is arranged on the stator casing, and the stator casing is arranged on the outer ring of the magnetic conduction ring.
As a specific example, the magnetic conductive ring is formed by winding a silicon steel sheet or by die casting a soft magnetic composite material.
As a specific example, the material of the magnetic conductive pole piece is the same as the stator core or the magnetic conductive ring.
Compared with the prior art, the invention has the remarkable advantages that: (1) the form of the slotted annular concentrated winding is adopted, so that the electric loss of the winding at the end part of the rotor shaft is reduced, and the efficiency of the motor is improved; (2) the structure of the modularized stator is adopted, and the winding adopts a flat wire direct forming technology, so that the winding slot fullness rate and the winding process performance are improved, and the torque density is improved; (3) the magnetic circuit in parallel connection is realized by utilizing the axial magnetic conduction function of the SMC material, the coupling between the permanent magnetic circuit and the electric excitation magnetic circuit is small, the magnetic regulation effect is good, and the demagnetization risk of the permanent magnet is reduced; (4) and an axial magnetic field structure is adopted, the full rate of the grooves is easily improved by the excitation winding ring structure, the axial length is short, and the hub integration is easier.
Drawings
Fig. 1 is a schematic structural view of an axial flux concentrated winding type hybrid excitation motor according to the present invention, in which (a) is an exploded view of the hybrid excitation motor when an excitation winding is mounted on an outer ring of a stator core, (b) is a perspective view of the hybrid excitation motor when the excitation winding is mounted on the outer ring of the stator core, and (c) is an exploded view of the hybrid excitation motor when the excitation winding is mounted on an inner ring of the stator core.
Fig. 2 is a schematic structural diagram of a stator core of a 12-slot 10-pair pole axial flux concentration winding type hybrid excitation motor according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a rotor magnetizer according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a rotor permanent magnet in an embodiment of the invention.
Fig. 5 is a schematic structural diagram of a modular stator of a 12-slot 10-pair pole axial flux concentration winding type hybrid excitation motor in the embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a modular stator single module of a 12-slot 10-pair pole axial flux concentration winding type hybrid excitation motor in the embodiment of the invention.
In the figure: 1. a stator core; 2. an armature winding; 3. a permanent magnet; 4. an excitation winding; 5. a magnetic conductive ring; 6. a magnetic conductive pole block; 7. a rotor back yoke.
Detailed Description
The invention relates to an axial magnetic flux concentrated winding type hybrid excitation motor, which comprises a stator disc and two rotor discs, wherein the stator disc comprises a stator iron core 1, an armature winding 2, an excitation winding 4 and a magnetic conduction ring 5, and the rotor discs comprise a rotor back yoke 7, a magnetic conduction pole block 6 and a permanent magnet 3;
the left side and the right side of a stator core 1 of the stator disc are provided with 12N stator slots, N is a natural number, an armature winding 2 is arranged on a magnetic yoke of the stator core 1, and the armature winding 2 is of an annular structure; the excitation winding 4 is arranged on the outer ring of the stator core 1 or the inner ring of the stator core 1, or the inner ring and the outer ring of the stator core 1 are simultaneously arranged;
the two rotor disks are respectively arranged on two sides of the stator disk, and the number of rotor poles is matched with the number of stator slots to form a concentrated winding motor structure; the permanent magnets 3 and the magnetic conduction pole blocks 6 are alternately arranged on the rotor disks to form a 10N-pole rotor magnetic field, the two rotor disks are staggered with one pole and are arranged on two sides of the stator disk, wherein the magnetic conduction pole blocks 6 extend towards an outer ring in the radial direction and form an additional air gap of an excitation magnetic field with the magnetic conduction ring 5 on the stator iron core 1 in the axial direction.
Further, the stator slots of the stator core 1 are consistent in groove type and number, and the stator core 1 is formed by winding a silicon steel sheet steel strip or is formed by die-casting a soft magnetic composite material.
Further, the stator core 1 adopts a modular structure, and the thickness of the stator portion reserved in the slot on the stator core 1 is the same as the thickness of the stator teeth.
Further, when the excitation winding 4 is installed on the outer ring of the armature winding 2, the magnetic conductive ring 5 is installed on the outer ring of the excitation winding 4, and when the excitation winding 4 is installed on the inner ring of the armature winding 2, the magnetic conductive ring 5 is installed on the inner ring of the excitation winding 4; when the inner and outer rings of the stator core 1 are simultaneously provided with the excitation windings 4, the magnetic conduction ring 5 is arranged on the stator casing, and the stator casing is arranged on the outer ring of the magnetic conduction ring.
Further, the magnetic conductive ring 5 is formed by winding a silicon steel sheet or by die casting a soft magnetic composite material.
Further, the material of the magnetic pole piece 6 is the same as that of the stator core 1 or the magnetic ring 5.
The invention is described in further detail below with reference to the figures and specific examples.
Examples
With reference to fig. 1, the axial flux concentrated winding type hybrid excitation motor of the present invention includes a stator disc and two rotor discs, wherein the stator disc includes a stator core 1, an armature winding 2, an excitation winding 4 and a magnetic conductive ring 5, and the rotor discs include a rotor back yoke 7, a magnetic conductive pole block 6 and a permanent magnet 3;
fig. 1(a) is an exploded view of a hybrid excitation motor in which an excitation winding is mounted on an outer ring of a stator core, fig. 1(b) is a perspective view of the hybrid excitation motor in which the excitation winding is mounted on the outer ring of the stator core, and fig. 1(c) is an exploded view of the hybrid excitation motor in which the excitation winding is mounted on an inner ring of the stator core.
With reference to fig. 2, 12 stator slots are formed on the left and right sides of a stator core 1 of the stator disc, an armature winding 2 is mounted on a magnetic yoke of the stator core 1, the armature winding 2 is in an annular structure, an excitation winding 4 is mounted on an inner ring or an outer ring of the armature winding 2, and a magnetic ring 5 is mounted on an outer ring of the excitation winding 4;
with reference to fig. 3 and 4, the two rotor disks are respectively disposed on two sides of the stator disk, and the number of rotor poles matches the number of stator slots to form a concentrated winding motor structure; the permanent magnets 3 and the magnetic conductive pole blocks 6 are alternately arranged on the rotor disks, the two rotor disks are staggered with one pole and are arranged on two sides of the stator disk, wherein the magnetic conductive pole blocks 6 extend to the outer ring in the radial direction and form an additional air gap of an excitation magnetic field with the magnetic conductive ring 5 on the stator core 1 in the axial direction.
Further, with reference to fig. 5 and 6, the stator slots of the stator core 1 have the same groove type and number, and the stator core 1 is formed by winding a silicon steel strip or by die-casting a soft magnetic composite material; the thickness of the stator part reserved on the slot of the stator iron core 1 is the same as that of the stator teeth; the stator core 1 may adopt a modular structure.
Further, the excitation winding 4 may be installed on the outer ring of the stator core 1, the inner ring of the stator core 1, or both the inner ring and the outer ring of the stator core 1; the magnetic conductive ring 5 is arranged on the outer ring of the excitation winding 4; the magnetic conduction ring 5 is formed by winding a silicon steel sheet or die-casting a soft magnetic composite material.
Further, the material of the magnetic pole piece 6 is the same as that of the stator core 1 or the magnetic ring 5.
The invention adopts the form of the slotted annular concentrated winding, reduces the electric loss of the winding at the end part of the rotor shaft, and improves the efficiency of the motor; the structure of the modularized stator is adopted, and the winding adopts a flat wire direct forming technology, so that the winding slot fullness rate and the winding process performance are improved, and the torque density is improved; the magnetic circuit in parallel connection is realized by utilizing the axial magnetic conduction function of the SMC material, the coupling between the permanent magnetic circuit and the electric excitation magnetic circuit is small, the magnetic regulation effect is good, and the demagnetization risk of the permanent magnet is reduced; and an axial magnetic field structure is adopted, the full rate of the grooves is easily improved by the excitation winding ring structure, the axial length is short, and the hub integration is easier.

Claims (6)

1. An axial magnetic flux concentrated winding type hybrid excitation motor is characterized by comprising a stator disc and two rotor discs, wherein the stator disc comprises a stator core (1), an armature winding (2), an excitation winding (4) and a magnetic conduction ring (5), and the rotor discs comprise a rotor back yoke (7), a magnetic conduction pole block (6) and a permanent magnet (3);
the left side and the right side of a stator core (1) of the stator disc are respectively provided with 12N stator slots, N is a natural number, an armature winding (2) is arranged on a magnetic yoke of the stator core (1), and the armature winding (2) is of an annular structure; the excitation winding (4) is arranged on the outer ring of the stator iron core (1) or the inner ring of the stator iron core (1), or the inner ring and the outer ring of the stator iron core (1) are simultaneously arranged;
the two rotor disks are respectively arranged on two sides of the stator disk, and the number of rotor poles is matched with the number of stator slots to form a concentrated winding motor structure; the permanent magnets (3) and the magnetic conduction pole blocks (6) are alternately arranged on the rotor disks to form a 10N-pole rotor magnetic field, the two rotor disks are staggered with one pole and are arranged on two sides of the stator disk, wherein the magnetic conduction pole blocks (6) extend towards an outer ring in the radial direction and form an additional air gap of the excitation magnetic field with the magnetic conduction rings (5) on the stator iron core (1) in the axial direction.
2. The axial flux concentrated winding type hybrid excitation motor according to claim 1, wherein the stator slots on the left and right sides of the stator core (1) have the same slot type, and the stator core (1) is formed by winding a silicon steel sheet and a steel strip or by die-casting a soft magnetic composite material.
3. The axial flux concentration winding type hybrid excitation motor according to claim 1 or 2, wherein the stator core (1) has a modular structure, and the thickness of a magnetic yoke reserved in a slot on the stator core (1) is the same as that of a stator tooth.
4. The axial flux concentrated winding type hybrid excitation motor according to claim 1 or 2, wherein when the excitation winding (4) is installed at an outer ring of the armature winding (2), the magnetic conductive ring (5) is installed at an outer ring of the excitation winding (4), and when the excitation winding (4) is installed at an inner ring of the armature winding (2), the magnetic conductive ring (5) is installed at an inner ring of the excitation winding (4); when the inner ring and the outer ring of the stator core (1) are simultaneously provided with the excitation winding (4), the magnetic conduction ring (5) is arranged on the stator casing, and the stator casing is arranged on the outer ring of the magnetic conduction ring.
5. The axial flux concentrated winding type hybrid excitation motor according to claim 4, wherein the flux ring (5) is wound from a silicon steel sheet or die-cast from a soft magnetic composite material.
6. The axial flux concentrated winding type hybrid excitation motor according to claim 5, wherein the material of the magnetically conductive pole piece (6) is the same as that of the stator core (1) or the magnetically conductive ring (5).
CN201910683071.9A 2019-07-26 2019-07-26 Axial magnetic flux concentrated winding type hybrid excitation motor Active CN110460175B (en)

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CN111049288B (en) * 2019-12-31 2021-01-29 郑州轻工业大学 Surrounding type winding magnetic flux modulation stator structure
CN110994821B (en) * 2019-12-31 2021-01-22 郑州轻工业大学 Magnetic flux modulation stator structure using axial sectional type hysteresis loop
CN111541351B (en) * 2020-04-30 2022-04-01 南京理工大学 Double-stator single-rotor axial magnetic field hybrid excitation synchronous motor
CN112054610A (en) * 2020-09-21 2020-12-08 广州市昊志机电股份有限公司 Stator module, motor and direct-drive rotary table
CN112737152B (en) * 2020-12-17 2021-10-22 郑州轻工业大学 Centralized automatic magnetic-regulating speed-regulating motor stator structure
TWI756120B (en) * 2021-04-27 2022-02-21 鴻銘節能股份有限公司 Improved structure of disc generator

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