CN108336836B - Electric machine - Google Patents

Electric machine Download PDF

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Publication number
CN108336836B
CN108336836B CN201810157013.8A CN201810157013A CN108336836B CN 108336836 B CN108336836 B CN 108336836B CN 201810157013 A CN201810157013 A CN 201810157013A CN 108336836 B CN108336836 B CN 108336836B
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China
Prior art keywords
tooth
permanent magnet
working surface
motor
magnet array
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CN201810157013.8A
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Chinese (zh)
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CN108336836A (en
Inventor
何春旺
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Zhuhai Panlei Intelligent Technology Co ltd
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Zhuhai Panlei Intelligent Technology Co ltd
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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
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/16—Stator cores with slots for windings
    • H02K1/165—Shape, form or location of the slots
    • 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
    • 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)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)

Abstract

The invention provides a motor with a novel magnetic circuit structure. The motor comprises a stator assembly and a rotor assembly, wherein the stator assembly is provided with a winding and a magnetic conduction element, and a permanent magnet array is fixed on the rotor assembly. The radial distance of the working surface of the stator assembly has an undulation period along the circumferential direction, and the radial distance of the working surface of the permanent magnet array has an undulation period along the circumferential direction. The width of the working surface of the permanent magnets of the permanent magnet array in the circumferential direction is at least 1.5 times the width of the working surface of the tooth crown of the stator assembly in the circumferential direction. When the teeth of the permanent magnet and the stator assembly move relatively, a thin air gap with a fluctuation period is generated between the working surface of the tooth crown and the working surface of the permanent magnet, so that large and uniform transition force can be constructed, the rotating stability of the motor can be improved, the harmonic wave of the motor can be weakened, and the working efficiency of the motor can be improved.

Description

Electric machine
Technical Field
The invention relates to the field of motors, in particular to a motor with a novel magnetic circuit structure.
Background
The motor is a common driving device in daily life and can convert electric energy into mechanical energy. The motor contains stator module and rotor subassembly, relies on the electromagnetism transform to realize the relative stator module's of rotor subassembly rotation, and the rotor subassembly is through pivot output power. But the magnetic field intensity between the permanent magnet of motor and the tooth is comparatively concentrated nowadays, reduces the pivoted stability of the rotor subassembly of motor, increases the rotation load loss of motor, reduces the work efficiency of motor.
Disclosure of Invention
The invention provides a motor with high working efficiency.
In order to achieve the above purpose, the present invention provides a motor with a novel magnetic circuit structure. The motor comprises a stator assembly and a rotor assembly, wherein the stator assembly is provided with a winding and a magnetic conduction element, and a permanent magnet array is fixed on the rotor assembly. The radial distance of the working surface of the stator assembly has an undulation change period along the circumferential direction, and the radial distance of the working surface of the permanent magnet array has an undulation change period along the circumferential direction; the width of the working surface of the permanent magnets of the permanent magnet array in the circumferential direction is at least 1.5 times the width of the working surface of the tooth crown of the stator assembly in the circumferential direction.
According to the scheme, when the teeth of the permanent magnet and the stator assembly move relatively, a thin air gap with a fluctuation period is generated between the working surface of the tooth crown and the working surface of the permanent magnet, so that large and uniform transition force can be constructed, the rotating stability of the motor is improved, the harmonic wave of the motor can be weakened, and the working efficiency of the motor is improved.
Preferably, the width of the working surface of the permanent magnet array in the circumferential direction is more than 2 times the width of the working surface of the crown of the stator assembly in the circumferential direction. The structure of the dense tooth crown structure is facilitated, and the stability of the rotation of the motor is further improved.
The further scheme is that the working surface of the stator assembly has a fluctuation period smaller than that of the permanent magnet array. The transition force formed between the stator assembly and the rotor assembly is further enhanced, and the working stability of the motor is improved. Which is beneficial for further attenuating the motor harmonics.
Further, the fluctuation of each period of the working surface of the stator assembly is formed by the working surfaces of a preset number of tooth crowns.
Further, the preset number of the working surfaces of the tooth crown is one. The structure of single tooth crown is favorable to keeping the working face of the fluctuation cycle of the stator module, improves the density of the tooth crown, is favorable to further weakening the harmonic of the motor, and improves the working efficiency of the motor.
Further, the winding is a distributed winding. The distributed windings are electrified to generate magnetic poles with different requirements, so that the transition stability during relative movement of the permanent magnet and the stator assembly is improved, and the working efficiency of the motor is further improved.
The permanent magnet of the permanent magnet array is positioned at the outer side of the tooth crown; the working surface of the permanent magnet close to the tooth crown is a V-shaped concave surface.
The other scheme is that the permanent magnet of the permanent magnet array is positioned on the inner side of the tooth crown; the working surface of the permanent magnet close to the tooth crown is a V-shaped convex surface.
According to the scheme, the permanent magnet is in a V-shaped layout structure, and the overall fluctuation period of the permanent magnet array is formed. The V-shaped layout enables transition to be easy to cut in, and after cutting in, the permanent magnet is subjected to front force application and is easy to form tangential force, so that radial force is reduced, and radial abrasion of the shaft is reduced.
The tooth width of the tooth close to the tooth crown is larger than that of the tooth close to the yoke part of the magnetic conductive element; the tooth height of the tooth close to the permanent magnet is smaller than the tooth height of the tooth close to the yoke part of the magnetic conductive element. The stator has the advantages of being beneficial to enlarging the groove width of the stator, increasing the tooth groove area, increasing the conductive sectional area of the winding, increasing the effective length, reducing the copper consumption, improving the power density and further improving the integral working efficiency of the motor. The axial height of the magnetic conduction element is slightly increased, partial heat dissipation space is used without affecting the end heat dissipation airflow channel, the air flow channel in the slot is increased, the internal space of the motor is reasonably utilized, and the heat dissipation capacity in the motor is improved.
Further, the cross-sectional area of the portion of the tooth located between the tooth crown and the stator yoke is equivalent in the radial direction. The method is beneficial to increasing the effective magnetic flux, improving the utilization rate of electric energy and further improving the working efficiency of the motor.
Drawings
Fig. 1 is a schematic structural view of an external rotor motor according to a first embodiment of the motor of the present invention;
fig. 2 is a schematic structural view of another external rotor motor according to the first embodiment of the motor of the present invention;
fig. 3 is a schematic structural view of another external rotor motor according to the first embodiment of the motor of the present invention;
fig. 4 is a schematic structural view of an inner rotor motor according to a first embodiment of the motor of the present invention;
fig. 5 is a schematic structural view of a double stator motor according to a second embodiment of the motor of the present invention;
fig. 6 is a schematic structural view of another double-rotor motor according to a second embodiment of the motor of the present invention;
FIG. 7 is a schematic stator view of a third embodiment of the machine;
fig. 8 is a cross-sectional view of fig. 7.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
First embodiment of the Motor
As shown in fig. 1, the electric machine 100 includes a stator assembly 101 and a rotor assembly 102. The stator assembly 101 is provided with a magnetic conductive element 1011, the magnetic conductive element 1011 is provided with teeth, and one end of the teeth facing the rotor assembly 102 is provided with a crown 1012. Crown 1012 includes a concave crown 1013 and a convex crown 1014. The concave crowns 1013 and the convex crowns 1014 are alternately arranged, and the working surfaces of every three crowns sequentially form unit fluctuation variables in fluctuation cycles of the convex surface, the concave surface and the convex surface, so that the radial distance of the working surface of the stator assembly has fluctuation cycles along the circumferential direction. The rotor assembly 102 includes a permanent magnet array 1021 and a rotor frame 1025. In the radial direction of the motor 100, the permanent magnets 1023 of the permanent magnet array 1021 are surface-mounted on the inside surface of the rotor frame 1025. The working surface of the permanent magnet 1023 near the crown 1012 is V-concave and constitutes the working surface of the permanent magnet array. The radial distance of the working surface of the permanent magnet array has an undulating variation cycle along the circumferential direction of the motor. In the circumferential direction of the motor 100, the width of the working surface of the permanent magnet 1023 is at least 1.5 times the width of the working surface of the crown 1012 of the stator assembly 1011, and preferably the width of the working surface of the permanent magnet 1023 is more than twice the width of the working surface of the crown 1012 of the stator assembly 1011. The working face of the stator assembly 101 has a period of undulation that is less than the period of undulation of the working face of the permanent magnet array. When the teeth of the permanent magnet 1023 and the stator assembly 101 move relatively, a thin air gap with a fluctuation period is generated between the working surface of the tooth crown 1012 and the working surface of the permanent magnet 1023, so that large and uniform transition force can be constructed, the rotating stability of the motor can be improved, the harmonic wave of the motor can be weakened, and the working efficiency of the motor can be improved.
Preferably, the windings 1015 on the teeth of the magnetic permeable element 1011 are distributed windings.
Optionally, the working surface of the fluctuating period of the stator assembly of the motor is not limited to be formed by intersecting intervals of concave tooth crowns and convex tooth crowns, see fig. 1; as shown in fig. 2, the fluctuation of the working surface of the stator assembly of the motor 200 may be constituted by four tooth crowns 201, so that the working surface of the stator assembly 202 has a fluctuation cycle.
Preferably, as shown in fig. 3, the fluctuation of the working surface of the stator assembly 301 of the motor 300 in each period can also be formed by the working surface of a single tooth crown. The arrangement of the single tooth crown is beneficial to improving the density of the tooth crown, further weakening the harmonic wave of the motor and improving the working efficiency of the motor.
The motor is not limited to an outer rotor structure, and may be an inner rotor structure. As shown in fig. 4, the working surfaces of the outer stator assembly 101 and the inner rotor assembly 102 of the motor 400 both have a varying period of undulation.
Second embodiment of the electric machine
This embodiment is substantially the same as the first embodiment, except for the number of stator and rotor assemblies.
As shown in fig. 5, the motor 500 is a dual rotor motor comprising a first permanent magnet array 501, a second permanent magnet array 502 and a magnetically permeable element 503 of the stator assembly. The working surfaces of the first permanent magnet array 501 and the second permanent magnet array 502 both have a period of undulation. The magnetic conductive elements 503 of the stator assembly have the same number of teeth in the external crown 5031 and the internal crown 5032, which form a working surface with a period of fluctuation. The working surface of the stator component and the working surface of the permanent magnet array work in a matched mode, a thin air gap with a fluctuation period is generated, large and uniform transition force is favorably constructed, the rotating stability of the motor is improved, the harmonic wave of the motor is favorably weakened, and the working efficiency of the motor is improved.
The motor may also be a double stator motor. As shown in fig. 6, the motor 600 includes a first magnetic permeable element 601, a second magnetic permeable element 602, and a permanent magnet array 603. The permanent magnet array 603 is provided with an outer permanent magnet array 6031 acting on the first magnetic conductive element 601, and an inner permanent magnet array 6032 acting on the second magnetic conductive element 602. The working surfaces of the crown of the first magnetic conductive element 601, the crown of the second magnetic conductive element 602, the outer permanent magnet array 6031 and the inner permanent magnet array 6032 all have fluctuating variation cycles. A thinner air gap with fluctuation cycle is generated between the permanent magnet of the outer magnetic pole array 6031 and the tooth crown of the first magnetic conductive element 601 and is distributed along the circumferential direction of the motor 600; a relatively thin air gap with a period of undulation is generated between the permanent magnets of the inner magnetic pole array 6032 and the tooth crown of the second magnetic permeable element 302 and is distributed along the circumference of the motor 600.
The rotor assembly of a dual stator motor may also use a single permanent magnet array structure.
Third embodiment of the Motor
This embodiment is substantially the same as the first embodiment, except that the magnetic conductive element is formed with teeth of different shapes.
As shown in fig. 7 and 8, the magnetic conductive element 700 includes a tooth 701, a crown 702, and a yoke 703. The tooth width of the tooth 701 near the crown 702 is greater than the tooth width of the tooth 701 near the yoke 703. The tooth height of the tooth 701 near the permanent magnet 704 is smaller than the tooth height of the tooth 701 near the yoke 703. While ensuring that the cross-sectional area of the portion of the tooth 701 between the crown 702 and the yoke 703 is comparable. The slot width of the magnetic conductive element 700 is favorably enlarged, the conductive sectional area of a winding is favorably increased, the slot filling rate is improved, the effective edge length is increased, the resistance is reduced, the copper consumption is reduced, and the power density is improved. The axial height of the stator is slightly increased, partial heat dissipation space is used without affecting the end heat dissipation airflow channel, the in-slot airflow channel is increased, the internal space of the motor is reasonably utilized, and the heat dissipation capacity of the interior of the motor is improved. The motor is beneficial to increasing effective magnetic flux, improves the utilization rate of electric energy and comprehensively improves the working efficiency of the motor. The structure of the teeth of the stator is not limited to the use in the inner stator motor, but may be used in an outer stator motor, a double rotor motor, and the like.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several equivalent substitutions or obvious modifications, which are equivalent in performance or use, without departing from the inventive concept, should be considered as falling within the scope of the present invention as defined by the appended claims.

Claims (9)

1. The motor, including stator module and rotor subassembly, stator module is provided with winding and magnetic conduction component, the magnetic conduction component is provided with the tooth, the rotor subassembly is fixed with permanent magnet array, its characterized in that:
the radial distance of the working surface of the stator assembly has an undulate change period along the circumferential direction;
the radial distance of the working surface of the permanent magnet array has an undulating change period along the circumferential direction;
the width of the working surface of the permanent magnet array along the circumferential direction is at least 1.5 times of the width of the working surface of the tooth crown of the stator assembly along the circumferential direction;
the tooth width of the tooth close to the tooth crown is larger than the tooth width of the tooth close to the yoke part of the magnetic conductive element;
the tooth height of the tooth close to the permanent magnet array is smaller than the tooth height of the tooth close to the yoke part of the magnetic conduction element;
the tooth height is the size of the tooth of the magnetic conductive element distributed along the axial direction of the magnetic conductive element.
2. The electric machine of claim 1, wherein:
the width of the working surface of the permanent magnet array along the circumferential direction is more than 2 times of the width of the working surface of the tooth crown of the stator assembly along the circumferential direction.
3. The electric machine of claim 2, wherein:
the working face of the stator assembly has a period of undulation that is less than a period of undulation of the working face of the permanent magnet array.
4. The electric machine of claim 1, wherein:
the undulation change of each period of the working surface of the stator assembly is composed of the working surfaces of a predetermined number of tooth crowns.
5. The electric machine of claim 4, wherein:
the predetermined number is one.
6. The electric machine of any of claims 1 to 5, wherein:
the windings are distributed windings.
7. The electric machine of claim 1, wherein:
the permanent magnets of the permanent magnet array are positioned on the outer side of the tooth crown;
the working surface of the permanent magnet, which is close to the tooth crown, is a V-shaped concave surface.
8. The electric machine of claim 1, wherein:
the permanent magnets of the permanent magnet array are positioned on the inner side of the tooth crown;
the working surface of the permanent magnet, which is close to the tooth crown, is a V-shaped convex surface.
9. The electric machine of claim 7, wherein:
the cross-sectional area of the tooth at the portion between the crown and the yoke of the magnetic conductive element is equivalent in the radial direction.
CN201810157013.8A 2017-11-22 2018-02-24 Electric machine Active CN108336836B (en)

Applications Claiming Priority (2)

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CN201711176155 2017-11-22
CN2017111761550 2017-11-22

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CN108336836B true CN108336836B (en) 2020-07-28

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Publication number Priority date Publication date Assignee Title
CN219779878U (en) * 2023-01-29 2023-09-29 北京三快在线科技有限公司 Outer rotor motor

Citations (5)

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Publication number Priority date Publication date Assignee Title
EP1282214A2 (en) * 2001-07-31 2003-02-05 Nissan Motor Co., Ltd. Permanent magnet motor/generator
JP2010022088A (en) * 2008-07-08 2010-01-28 Kokusan Denki Co Ltd Magnet rotation type rotary electric machine
JP2013027240A (en) * 2011-07-25 2013-02-04 Daikin Ind Ltd Rotary electric machine
CN103427509A (en) * 2012-05-17 2013-12-04 深圳市配天电机技术有限公司 Concentrated-winding motor, generator and motor
JP2015057012A (en) * 2013-09-13 2015-03-23 株式会社デンソー Dynamo-electric machine

Family Cites Families (4)

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Publication number Priority date Publication date Assignee Title
JP2002136001A (en) * 2000-10-25 2002-05-10 Mitsubishi Electric Corp Permanent magnet motor
JP2008167593A (en) * 2006-12-28 2008-07-17 Toyota Motor Corp Stator of motor and coil manufacturing method of motor
CN101222153B (en) * 2007-01-12 2012-03-14 台达电子工业股份有限公司 Rotation structure of permanent magnet motor and method determining its rotation structure
JP6411833B2 (en) * 2014-09-22 2018-10-24 株式会社ミツバ Brushless motor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1282214A2 (en) * 2001-07-31 2003-02-05 Nissan Motor Co., Ltd. Permanent magnet motor/generator
JP2010022088A (en) * 2008-07-08 2010-01-28 Kokusan Denki Co Ltd Magnet rotation type rotary electric machine
JP2013027240A (en) * 2011-07-25 2013-02-04 Daikin Ind Ltd Rotary electric machine
CN103427509A (en) * 2012-05-17 2013-12-04 深圳市配天电机技术有限公司 Concentrated-winding motor, generator and motor
JP2015057012A (en) * 2013-09-13 2015-03-23 株式会社デンソー Dynamo-electric machine

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