CN106374705B - Axial flux permanent magnet machine - Google Patents
Axial flux permanent magnet machine Download PDFInfo
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- CN106374705B CN106374705B CN201611104587.6A CN201611104587A CN106374705B CN 106374705 B CN106374705 B CN 106374705B CN 201611104587 A CN201611104587 A CN 201611104587A CN 106374705 B CN106374705 B CN 106374705B
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- permanent magnet
- axial flux
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- rotor
- motor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K16/00—Machines with more than one rotor or stator
- H02K16/02—Machines with one stator and two or more rotors
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- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
- Motor Or Generator Cooling System (AREA)
Abstract
The invention provides an axial flux permanent magnet motor with low eddy current loss, and belongs to the field of motors. The motor adopts an outer rotor structure; the stator comprises a stator frame and two sets of slotless and ironless armature windings, the two sets of armature windings are symmetrically distributed on two sides of the stator frame, and phases of corresponding coils of the two sets of armature windings are different in an electrical angle theta along the circumferential direction. The invention adopts a special armature structure to form the axial flux coreless permanent magnet synchronous motor, and the suppression and the enhancement of electromotive force harmonic waves are realized through the armature structure, thereby reducing the eddy current loss in the permanent magnet when the motor runs at high speed and improving the efficiency of the motor.
Description
Technical Field
The invention relates to an axial flux permanent magnet motor, in particular to an axial flux permanent magnet motor with low eddy current loss, and belongs to the field of motors.
Background
The axial flux permanent magnet synchronous motor is also called a disc type permanent magnet synchronous motor, is used as a modern high-performance servo motor and a large-torque direct drive motor, is widely applied to mechanical and electrical integration products such as robots and the like, and starts to replace the traditional servo motor product.
The axial flux permanent magnet synchronous motor has the advantages of short axial size, light weight, small volume and compact structure. Because the permanent magnet is adopted for excitation, the rotor part has no magnetic hysteresis and eddy current loss, and the running efficiency of the motor is high; because the stator and the rotor are symmetrically arranged, the stator winding has good heat dissipation conditions, and high power density can be obtained. The rotor has the advantages of small rotational inertia, small electromechanical time constant, high peak torque and locked-rotor torque, large torque/weight ratio, stable low-speed operation and excellent dynamic performance.
In order to reduce the magnetic resistance of a magnetic circuit, an axial flux permanent magnet synchronous motor is usually manufactured by laminating silicon steel sheets with high magnetic permeability into an iron core, and the iron core has the problems of large size, heavy weight, large loss, large vibration noise and the like.
Disclosure of Invention
In view of the above disadvantages, the present invention provides an axial flux permanent magnet motor with small volume, light weight, low loss and low vibration noise.
The axial flux permanent magnet motor comprises a stator, a rotor and an air gap, wherein the motor adopts an outer rotor structure;
the stator comprises a stator frame and two sets of slotless and ironless armature windings, the two sets of armature windings are symmetrically distributed on two sides of the stator frame, and phases of corresponding coils of the two sets of armature windings are different in an electrical angle theta along the circumferential direction.
Preferably, the electrical angle θ is:
wherein p is1The number of harmonics desired to be retained for an axial flux permanent magnet machine;
p2the number of harmonic waves to be eliminated is the number of the harmonic waves to be eliminated of the axial flux permanent magnet motor;
when p is1<p2When is not in use, and
odd, offset by an electrical angle θ;
when p is1<p2When is not in use, and
even, offset by an electrical angle θ, while the current is reversed;
when p is1>p2When is not in use, and
odd, offset by an electrical angle θ, while the current is reversed;
when p is1>p2When is not in use, and
even, offset by an electrical angle θ.
Preferably, a cooling water tank is provided in the stator frame.
Preferably, the cooling water tank is located corresponding to armature windings on both sides of the stator frame.
Preferably, the rotor is of a double-rotor structure, the double-rotor structure is symmetrically distributed on two sides of the stator, double air gaps are formed between the double-rotor structure and the stator, and n is an even number greater than zero;
each rotor structure comprises a rotor core and n fan-shaped permanent magnets, wherein the n fan-shaped permanent magnets are bonded on the rotor core and are uniformly distributed along the circumference, the fan-shaped permanent magnets are magnetized in parallel along the axial direction, the polarities of the adjacent fan-shaped permanent magnets on the same rotor are opposite, and the polarities of the fan-shaped permanent magnets axially opposite on the two opposite rotors are opposite.
The axial flux coreless permanent magnet synchronous motor has the advantages that the special armature structure is adopted, the axial flux coreless permanent magnet synchronous motor is formed, and the suppression and the enhancement of electromotive force harmonic waves are realized through the armature structure, so that the eddy current loss in the permanent magnet during the high-speed operation of the motor is reduced, and the efficiency of the motor is improved.
Drawings
Fig. 1 is a schematic structural diagram of a stator.
Fig. 2 is a schematic structural view of the rotor.
Fig. 3 is a schematic diagram of an axial flux permanent magnet machine including the stator of fig. 1 and the rotor of fig. 2.
Fig. 4 is a schematic structural diagram of a stator frame.
Fig. 5 is a structural view of a stator including the stator frame of fig. 4.
Fig. 6 is a schematic diagram of an axial flux permanent magnet machine including the rotor of fig. 2 and the stator of fig. 5.
Detailed Description
The present embodiment is described with reference to fig. 1 to 6, and the axial flux permanent magnet motor of the present embodiment includes a stator, a rotor, and an air gap, and the motor adopts an outer rotor structure;
the stator comprises a stator frame 2 and two sets of slotless and ironless armature windings 1, wherein the two sets of armature windings 1 are symmetrically distributed on two sides of the stator frame 2, and phases of coils corresponding to the two sets of armature windings 1 are different in an electrical angle theta along the circumferential direction.
In the embodiment, the suppression and the enhancement of the electromotive force harmonic are realized by arranging the two sets of armature windings 1 and the electric angle theta, so that the eddy current loss in the permanent magnet during the high-speed operation of the motor is reduced, and the efficiency of the motor is improved.
In a preferred embodiment, the electrical angle θ is:
wherein p is1The number of harmonics desired to be retained for an axial flux permanent magnet machine;
p2the number of harmonic waves to be eliminated is the number of the harmonic waves to be eliminated of the axial flux permanent magnet motor;
when p is1<p2When is not in use, and
odd, offset by an electrical angle θ;
when p is1<p2When is not in use, and
even, offset by an electrical angle θ, while the current is reversed;
when p is1>p2When is not in use, and
odd, offset by an electrical angle θ, while the current is reversed;
when p is1>p2When is not in use, and
even, offset by an electrical angle θ.
The present embodiment specifically provides how to determine the electrical angle θ and the current direction as needed.
In the preferred embodiment, a cooling water tank is provided in the stator frame 2.
This embodiment reduces the heat loss of the motor.
In the preferred embodiment, the cooling water slots are located to correspond to the armature windings 1 on both sides of the stator frame 2.
As shown in fig. 4, the shape of the stator frame 2 is used for supporting, and the position of the cooling water tank in the stator frame 2 is also used for corresponding to the armature winding, so as to absorb the heat generated during the operation of the armature winding and reduce the heat loss.
In a preferred embodiment, the rotor is a dual-rotor structure, the dual-rotor structure is symmetrically distributed on two sides of the stator, a dual air gap is formed between the dual-rotor structure and the stator, and n is an even number greater than zero;
each rotor structure comprises a rotor core 4 and n fan-shaped permanent magnets 3, the n fan-shaped permanent magnets 3 are bonded on the rotor core 4 and are uniformly distributed along the circumference, the fan-shaped permanent magnets 3 are magnetized in parallel along the axial direction, the polarities of the adjacent fan-shaped permanent magnets 3 on the same rotor are opposite, and the polarities of the fan-shaped permanent magnets 3 opposite to each other in the axial direction on the two opposite rotors are opposite.
This embodiment gives the structure of rotor, through rotor and stator cooperation, realizes the motor function.
Claims (4)
1. An axial flux permanent magnet motor comprises a stator, a rotor and an air gap, the motor adopts an outer rotor structure, the stator comprises a stator frame (2) and two sets of slotless and ironless armature windings (1), the two sets of armature windings (1) are symmetrically distributed on two sides of the stator frame (2), and the axial flux permanent magnet motor is characterized in that the phases of corresponding coils of the two sets of armature windings (1) differ by an electrical angle theta along the circumferential direction;
the electrical angle θ is:
wherein p is1The number of harmonics desired to be retained for an axial flux permanent magnet machine;
p2the number of harmonic waves to be eliminated is the number of the harmonic waves to be eliminated of the axial flux permanent magnet motor;
when p is1＜p2When is not in use, and
odd, offset by an electrical angle θ;
when p is1＜p2When is not in use, and
even, offset by an electrical angle θ, while the current is reversed;
when p is1>p2When is not in use, and
odd, offset by an electrical angle θ, while the current is reversed;
when p is1>p2When is not in use, and
even, offset by an electrical angle θ.
2. An axial flux permanent magnet machine according to claim 1, characterized in that cooling water channels are provided in the stator frame (2).
3. An axial flux permanent magnet machine according to claim 2, characterized in that the cooling water channels are located in correspondence with the armature windings (1) on both sides of the stator frame 2.
4. The axial flux permanent magnet motor of claim 2, wherein the rotor is a dual-rotor structure, the dual-rotor structure is symmetrically distributed on two sides of the stator, a dual air gap is formed between the dual-rotor structure and the stator, and n is an even number greater than zero;
each rotor structure comprises a rotor core (4) and n fan-shaped permanent magnets (3), wherein the n fan-shaped permanent magnets (3) are bonded on the rotor core (4) and are uniformly distributed along the circumference, the fan-shaped permanent magnets (3) are magnetized in parallel along the axial direction, the adjacent fan-shaped permanent magnets (3) on the same rotor are opposite in polarity, and the fan-shaped permanent magnets (3) axially opposite on the two opposite rotors are opposite in polarity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611104587.6A CN106374705B (en) | 2016-12-05 | 2016-12-05 | Axial flux permanent magnet machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611104587.6A CN106374705B (en) | 2016-12-05 | 2016-12-05 | Axial flux permanent magnet machine |
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| Publication Number | Publication Date |
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| CN106374705A CN106374705A (en) | 2017-02-01 |
| CN106374705B true CN106374705B (en) | 2020-04-24 |
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| CN201611104587.6A Active CN106374705B (en) | 2016-12-05 | 2016-12-05 | Axial flux permanent magnet machine |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109742916A (en) * | 2019-02-21 | 2019-05-10 | 郑州大学 | A kind of permanent magnetism list stator and double-rotor disc type electric machine weakening cogging torque |
| CN111614220B (en) * | 2020-06-10 | 2021-11-09 | 山东大学 | Low-torque pulsation high-speed axial magnetic flux surface-mounted permanent magnet motor |
| CN111934508B (en) * | 2020-08-11 | 2022-11-29 | 哈尔滨工业大学 | Radial magnetic field coreless permanent magnet synchronous motor |
| CN113300558B (en) * | 2021-06-10 | 2022-07-01 | 哈尔滨工业大学 | Double concentrated winding permanent magnet synchronous motor |
| CN114498996B (en) * | 2022-02-17 | 2023-08-18 | 沈阳工业大学 | Double m-phase winding separated type asymmetric axial flux permanent magnet motor |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201846198U (en) * | 2010-11-12 | 2011-05-25 | 湘潭电机股份有限公司 | Double three-phase direct-drive permanent-magnet wind-driven generator |
| CN102160257A (en) * | 2008-07-16 | 2011-08-17 | 康明斯发电机技术有限公司 | Axial flux machine |
| CN105305749A (en) * | 2015-10-23 | 2016-02-03 | 南京航空航天大学 | Axial flux motor of stator iron-core-free Halbach permanent magnet array |
| CN105680585A (en) * | 2016-02-05 | 2016-06-15 | 东南大学 | Structure for modular motor stator and end part overlapping fractional slot windings of modular motor stator |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5708316A (en) * | 1992-10-23 | 1998-01-13 | Nippondenso Co., Ltd. | Altenator for a vehicle |
| JP2008079471A (en) * | 2006-09-25 | 2008-04-03 | Hitachi Industrial Equipment Systems Co Ltd | Fan system, motor, and claw pole type motor |
| CN104795917B (en) * | 2015-03-17 | 2018-01-05 | 华中科技大学 | A kind of polyphase machine winding mechanism |
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2016
- 2016-12-05 CN CN201611104587.6A patent/CN106374705B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102160257A (en) * | 2008-07-16 | 2011-08-17 | 康明斯发电机技术有限公司 | Axial flux machine |
| CN201846198U (en) * | 2010-11-12 | 2011-05-25 | 湘潭电机股份有限公司 | Double three-phase direct-drive permanent-magnet wind-driven generator |
| CN105305749A (en) * | 2015-10-23 | 2016-02-03 | 南京航空航天大学 | Axial flux motor of stator iron-core-free Halbach permanent magnet array |
| CN105680585A (en) * | 2016-02-05 | 2016-06-15 | 东南大学 | Structure for modular motor stator and end part overlapping fractional slot windings of modular motor stator |
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| CN106374705A (en) | 2017-02-01 |
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