CN112383192B - Self-cooling axial flux motor with built-in axial flow fan - Google Patents
Self-cooling axial flux motor with built-in axial flow fan Download PDFInfo
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- CN112383192B CN112383192B CN202011312321.7A CN202011312321A CN112383192B CN 112383192 B CN112383192 B CN 112383192B CN 202011312321 A CN202011312321 A CN 202011312321A CN 112383192 B CN112383192 B CN 112383192B
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- 230000004907 flux Effects 0.000 title claims abstract description 19
- 238000001816 cooling Methods 0.000 title claims abstract description 17
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 35
- 239000010959 steel Substances 0.000 claims abstract description 35
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 31
- 229910052742 iron Inorganic materials 0.000 claims abstract description 14
- 238000004804 winding Methods 0.000 claims description 39
- 238000009423 ventilation Methods 0.000 claims description 16
- 230000017525 heat dissipation Effects 0.000 claims description 7
- 239000003822 epoxy resin Substances 0.000 claims description 6
- 229920000647 polyepoxide Polymers 0.000 claims description 6
- 229910000976 Electrical steel Inorganic materials 0.000 claims description 5
- 238000010030 laminating Methods 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 2
- 239000003570 air Substances 0.000 claims 17
- 239000012080 ambient air Substances 0.000 claims 1
- 238000000034 method Methods 0.000 claims 1
- 238000010248 power generation Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
- H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
- H02K9/06—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft
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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
- H02K1/14—Stator cores with salient poles
- H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
-
- 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
-
- 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
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
- H02K1/2766—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
- H02K1/2773—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect consisting of tangentially magnetized radial magnets
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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
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/10—Arrangements for cooling or ventilating by gaseous cooling medium flowing in closed circuit, a part of which is external to the machine casing
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Cooling System (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The invention provides a self-fan cooling axial flux motor with a built-in axial flow fan, which adopts a single-stator/double-rotor topology. The axial flow fan is positioned between the two rotors and fixed on the shaft. The air path enters from the outer circumferential vent hole on one side of the shell, passes through air gap air between the non-drive-end rotor magnetic steel and the stator core and air gap air between the axial flow fan and the drive-end rotor magnetic steel and the stator core, and flows out from the outer circumferential vent hole on the other side of the shell. On the one hand, the axial fan air cooling scheme of rotor has improved the convective heat transfer coefficient of magnet steel terminal surface, rotor back iron terminal surface, end cover terminal surface and stator wheel hub inner circumferential face. By adopting the air cooling scheme of the axial flow fan integrated in the motor, the heat generated by the motor can be quickly diffused into the outside air, so that the heat exchange efficiency is improved, and the remarkable improvement of the power density and the torque density is realized.
Description
Technical Field
The invention relates to an integrated starting/engine applied to the field of emergency power generation and new energy automobiles, in particular to a self-cooling axial flux motor with a built-in axial flow fan.
Background
The motors in the fields of emergency power generation and new energy automobiles are mostly alternating-current permanent magnet synchronous motors or alternating-current asynchronous motors with radial magnetic fluxes, and because the axial installation size of the traditional radial magnetic flux motor is large, the power density and the efficiency are low, the application of the motor in the occasions with strict space requirements and high power density requirements is limited.
A conventional low-power axial flux motor generally adopts a fin heat dissipation scheme on a base or end covers on two sides, and under the working conditions of large assembly error, large load or high rotating speed of a stator core and the end covers, a large amount of heat generated by the motor is only transferred by fins or water cooling, so that the heat cannot be dissipated and taken away in time, and great challenges are brought to insulation and temperature rise of the motor.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a self-fan cold axial flux motor with a built-in axial flow fan. The axial flow fan is positioned between the two rotors and fixed on the shaft. The air path enters from the outer circumferential vent hole on one side of the shell, passes through air gap air between the non-drive-end rotor magnetic steel and the stator core and air gap air between the axial flow fan and the drive-end rotor magnetic steel and the stator core, and flows out from the outer circumferential vent hole on the other side of the shell. On the one hand, the axial fan air cooling scheme of rotor has improved the heat convection coefficient of magnet steel terminal surface, rotor back iron terminal surface, end cover terminal surface and the interior circumference of stator wheel hub. By adopting the scheme of integrating the axial flow fan inside the motor for air cooling, the heat generated by the motor can be quickly diffused into the outside air, so that the heat exchange efficiency is improved, and the remarkable improvement of the power density and the torque density is realized.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a self-fan cold axial flux motor with a built-in axial flow fan adopts a single stator/double rotor framework, adopts a four-layer double three-phase fractional slot concentrated winding design with 12 slots and 10 poles or 12 slots and 14 poles, and reduces stator winding space harmonic waves; the rotor magnetic steel adopts a radial segmented design, and epoxy resin is coated on the surface of the rotor magnetic steel, so that the eddy current loss of the magnetic steel is reduced. The cooling scheme adopts a built-in axial flow fan heat dissipation scheme; the motor comprises a stator, a drive end rotor, a non-drive end rotor, a rotary transformer and an outlet box;
the axial flow fan is positioned between the two rotors and fixed on the shaft; the air path enters from the outer circumferential vent hole on one side of the shell, passes through air gap air between the non-drive-end rotor magnetic steel and the stator core and an axial flow fan and air gap air between the drive-end rotor magnetic steel and the stator core, and flows out from the outer circumferential vent hole on the other side of the shell.
Furthermore, the magnetic circuit penetrates through the non-drive-end stator, the rotor and the drive-end stator, and the magnetic steel at the same position of the rotors at the two ends is configured by N-S-N-S magnetizing.
Furthermore, the stator comprises a stator core, wherein the stator core is designed to be a core-free yoke part and is formed by radially laminating high-permeability and low-loss silicon steel sheets; the inner and outer circumferential surfaces of the stator core are provided with fan-shaped pressing plates, the fan-shaped pressing plates and the stator core on two sides are pressed and fixed along the radial direction by rivets, the stator core is sleeved with a stator winding, and the design of a concentrated winding is adopted.
Furthermore, the heat generated by the stator core and the windings in the slots of the stator windings realizes that the outside air enters from the ventilation holes at the non-driving end side of the outer circumference surface of the casing under the air suction/exhaust action of the built-in axial flow fan, passes through the axial flow fan through the air gap air layers at the two sides of the rotor at the non-driving end, passes through the air gap air layers at the two sides of the rotor at the driving end, and finally exhausts from the ventilation holes at the driving end side of the outer circumference of the casing to diffuse the heat into the surrounding environment.
Further, the relative movement of the stator and the two rotors is realized through a pair of bearings, the two bearings are distributed on the outer sides of the two rotors, and the two bearings can be selected from angular contact bearings, deep groove ball bearings or crossed roller bearings.
The principle of the invention is as follows: the self-fan cold axial flux motor with the built-in axial flow fan adopts a single-stator/double-rotor framework, in order to reduce the length of the end part of a stator winding, the winding adopts a concentrated winding, and rotor magnetic steel is radially segmented to reduce the eddy current loss of the magnetic steel; the cooling scheme adopts a built-in axial flow fan heat dissipation scheme. The motor comprises a stator 1, a drive end rotor 2b, a non-drive end rotor 2a, a rotary transformer 3 and an outlet box 4.
The magnetic circuit of the self-cooling axial flux motor with the external centrifugal fan penetrates through the stator 1, the non-driving end rotor 2a and the driving end rotor 2 b.
The stator 1 comprises a stator core 24, wherein the stator core 24 is designed to be a core-free yoke part and is formed by radially laminating high-permeability and low-loss silicon steel sheets. The stator core 23 is sleeved with a stator winding 21, and a concentrated winding design is adopted.
The heat generated by the stator core 24 and the in-slot windings of the stator winding 21 is induced by the induced/exhausted air of the built-in axial flow fan, so that the air is induced from the air vent on one side of the casing 17, and is exhausted from the air vent on the other side of the casing 17 through the air gap layer on the two sides of the non-drive-end rotor 2a and the drive-end rotor 2b, and finally the heat is diffused to the surrounding environment.
The relative movement of the stator 1 and the rotor 2 is realized by a pair of bearings, namely a first bearing 36 and a second bearing 46, and the first bearing 36 and the second bearing 46 can be selected as angular contact bearings or deep groove ball bearings.
The outlet box assembly 4 is secured to the housing 17 by second screws 15.
The drive end magnetic steel 39 and the non-drive end magnetic steel 43 in the rotor 2 adopt a radial segmented design in order to reduce the eddy current loss.
The rotor of the rotary transformer 3 is fixed on the motor spindle 40 through screws, and the stator of the rotary transformer 3 is fixed on the non-drive end cover 9 through third screws 16, so that accurate rotor position signal detection is realized.
The invention has the beneficial effects that:
(1) from the aspect of reducing loss, the stator winding adopts a 12-slot 10-pole or 12-slot 14-pole double three-phase four-layer fractional slot concentrated winding design, and space harmonics of the stator winding are reduced; the rotor magnetic steel adopts a radial segmented design, and epoxy resin is coated on the surface of the rotor magnetic steel, so that the eddy current loss of the magnetic steel is reduced.
(2) In the aspect of improving the heat dissipation capacity, a design with a built-in axial flow fan is adopted, wherein the built-in axial flow fan mainly realizes that outside air enters from a vent hole on one side of the casing, passes through an air gap air layer on two sides of one rotor on the non-driving end, passes through the axial flow fan, then passes through an air gap air layer on two sides of the other rotor on the driving end, exhausts air from a vent hole on the other side of the casing, and finally diffuses heat to the surrounding environment. Under the effect of air suction/exhaust of the axial flow fan, external air rapidly flows in multiple branches on the inner surface of the motor, so that the heat exchange efficiency of the motor is improved, and the cooling of the motor is realized. The motor adopting the topology and the cooling scheme can bear larger load, has more compact structure and improves the power density and the torque density of the motor.
Drawings
Fig. 1 is a cross-sectional view of the general structure of an axial-flux motor of the present invention, where 1 is a stator, 2a is a non-drive-end rotor, 2b is a drive-end rotor, 3 is a resolver, 4 is an outlet box assembly, 6 is a drive-end cover, 9 is a non-drive-end cover, 17 is a housing, 17a is a first ventilation hole, 17b is a second ventilation hole, and 42 is an axial-flow fan.
Fig. 2 is an exploded view of the overall structure of the axial flux motor of the present invention, where 1 is a stator, 2 is a rotor, 2a is a non-drive-end rotor, 2b is a drive-end rotor, 3 is a resolver, 4 is an outlet box assembly, 5 is a drive-end bearing cover, 6 is a drive-end cover, 7 is a first hole retainer, 8 is a second hole retainer, 9 is a non-drive-end cover, 10 is a resolver flange, 11 is a first screw, 12 is a first nut, 13 is a stud, 14 is a second nut, 15 is a second screw, and 16 is a third screw.
Fig. 3 is an axial view of an axial-flux motor according to the present invention, in which 17 denotes a housing, 17a denotes a first ventilation hole, and 17b denotes a second ventilation hole.
Fig. 4 is an exploded view of a stator assembly structure of an axial flux motor according to the present invention, where 17 is a housing, 17a is a first ventilation hole, 17b is a second ventilation hole, 17c is a rectangular wire outlet, 17d is an annular boss, 17e is a trapezoidal recessed platform, 18 is a first annular retaining ring, 19 is a second annular retaining ring, 20 is a stator hub, 20a is a rib plate, 20b is a hub, 21 is a stator winding, 22 is epoxy resin, 23 is a first sector pressing plate, 24 is a stator core, 25 is a second sector pressing plate, 26 is a third annular retaining ring, 27 is a fourth annular retaining ring, 28 is a fifth annular retaining ring, 29 is a fourth screw, 30 is a fifth screw, 31 is a sixth screw, 32 is a rivet, 33 is a seventh screw, 34 is an eighth screw, and 35 is a ninth screw.
Fig. 5 is an exploded view of a rotor assembly structure of an axial flux motor according to the present invention, where 36 is a first bearing, 37 is a drive-end rotor back iron, 38 is a drive-end pressing strip, 39 is drive-end magnetic steel, 40 is a motor spindle, 41 is a shaft retainer, 42 is an axial fan, 43 is non-drive-end magnetic steel, 44 is a non-drive-end pressing strip, 45 is a non-drive-end rotor back iron, and 46 is a second bearing.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
The magnetic circuit of the self-cooling axial flux motor with the built-in axial flow fan penetrates through the stator 1, the driving end rotor 2b and the non-driving end rotor 2 a. The wind path adopts a heat dissipation scheme of a built-in axial flow fan. The built-in axial flow fan 42 mainly realizes an air passage that draws air from the non-drive end side ventilation hole of the casing 17, flows through the air gap air layers on the two side end surfaces of the non-drive end rotor 2a, and enters the air inlet of the axial flow fan 42. And enters air gap air layers at two sides of the driving end rotor 2b, finally flows out of the driving end second ventilation hole 17b of the machine shell 17, and exhausts air to the surrounding air. Fig. 1 shows a cross section of the entire air passage 2D. The air inlet/outlet 3D mark is shown in figure 2.
The self-cooling axial flux motor with the built-in axial flow fan adopts a single-stator/double-rotor structure. The stator 1 is positioned between the non-driving end rotor 2a and the driving end rotor 2b, and the non-driving end cover 9, the driving end cover 6 and a shell 17 in the stator 1 are fixed through a first nut 12, a stud 13 and a second nut 14. The resolver flange 10 and the outer cover 5 of the drive end bearing are used for fixing the outer sides of the outer rings of the bearings at the two ends through third screws 16 and first screws 11 respectively. The first and second circlips 7 and 8 are used to fix the inner sides of the bearings at both ends. Outlet box assembly 4 is secured to housing 17 by second screws 15. The stator of the resolver 3 is fixed to the non-drive-end cover 9 by the third screws 16, and the rotor of the resolver 3 is fixed to the motor spindle 40 by screws, enabling accurate rotor position signal detection. The structure of the whole motor is shown in fig. 3.
The stator 1 comprises a stator core 24, and the stator core 24 is formed by radially laminating silicon steel sheets with high magnetic conductivity and low loss. The inner and outer circumferential surfaces of the stator core 24 are provided with a first sector-shaped pressure plate 23 and a second sector-shaped pressure plate 25, and the stator core 24, the first sector-shaped pressure plate 23 and the second sector-shaped pressure plate 25 are fastened along the radial direction through rivets 32. The stator winding 21 is wound on the stator core 24, and the stator core 24 wound with the stator winding 21 is placed between the adjacent rib plates 20a of the stator hub 20 by adopting a centralized winding design and is finally fixed on the machine shell 17. The circumferential surface of the housing 17 is designed with a first ventilation hole 17a, a second ventilation hole 17b and an outlet hole 1 c. Since the stator core 24 and the stator winding 21 are fixed to the stator hub 20, the fitting relationship therebetween and the fixing manner with the housing 17 are mainly described below. And the second annular retainer ring 19 and the third annular retainer ring 26 are pressed against two end faces of the second sector pressure plate 25 by using fifth screws 30 and eighth screws 34 at two sides of the inner ring of the stator 1 and are fixed on rib plates 20a of the stator hub 20. And the fourth annular retainer rings 18 and the fourth annular retainer rings 27 are pressed against the two end surfaces of the first fan-shaped pressure plate 23 by using fourth screws 29 and eighth screws 34 at two sides of the outer ring of the stator 1 and are fixed on rib plates 20a of the stator hub 20. The rib plate 20a of the stator hub 20 is fixed to the annular boss 17d of the housing 17 by the sixth screw 31. The circumferential limit of the rib plate 20a of the stator hub 20 is fixed by the trapezoidal concave 17e of the housing 17. The axial direction limitation of the rib plate 20a of the stator hub 20 is realized by the fifth annular retainer ring 28 and the annular boss 17d of the housing 17. Epoxy resin 22 is filled in a gap between the inner end winding of the stator winding 21 and the hub 20b of the stator hub 20, thereby improving the heat transfer coefficient and the axial sealing property between the inner end winding of the stator winding 21 and the stator hub 20. The exploded view of the stator 1 is shown in fig. 5.
The rotor 2 includes a non-driving rotor 2a, a driving-end rotor 2b and an axial flow fan 42. The non-driving end rotor comprises a non-driving end rotor back iron 45, non-driving end magnetic steel 43 and a non-driving end pressing strip 44, and the non-driving end magnetic steel 43 is fixed on the non-driving end rotor back iron 45 by using a screw and the non-driving end pressing strip 44; the driving end rotor comprises a driving end rotor back iron 37, a driving end magnetic steel 39 and a driving end pressing strip 38, and the driving end magnetic steel 39 is fixed on the driving end rotor back iron 37 through screws and the driving end pressing strip 38. The shaft retainer 41 is used for axial limiting of the non-drive end rotor back iron 45. The axial fan 42 is connected to the main shaft 40 via a spline pair to transmit torque. In order to reduce the eddy current loss, the non-drive-end magnetic steel 43 and the drive-end magnetic steel 39 are designed in a radial segmented manner, as shown in fig. 5.
The relative movement of the stator 1 with the non-drive end rotor 2a and the drive end rotor 2b is realized by a pair of bearings, namely a first bearing 36 and a second bearing 46, wherein the first bearing 36 and the second bearing 46 can be selected to be angular contact bearings or deep groove ball bearings and are respectively positioned at the outer sides of the non-drive rotor 2a and the drive end rotor 2 b. As shown in fig. 5.
While specific embodiments have been illustrated and described herein, it will be appreciated by those of ordinary skill in the art that a variety of alternate or equivalent implementations may be substituted for the specific embodiments shown and described without departing from the scope of the present invention. This application is intended to cover any adaptations or embodiments of the invention discussed herein. Therefore, it is intended that this invention be limited only by the claims and the equivalents thereof.
Claims (1)
1. The utility model provides a take built-in axial fan cold axial flux motor of certainly of axial fan which characterized in that: a single stator/double rotor framework is adopted, and a four-layer double three-phase fractional slot concentrated winding design with 12 slots and 10 poles or 12 slots and 14 poles is adopted, so that the space harmonic of a stator winding is reduced; the rotor magnetic steel adopts a radial segmented design, and the surface of the rotor magnetic steel is coated with epoxy resin, so that the eddy current loss of the magnetic steel is reduced; the cooling scheme adopts a built-in axial flow fan heat dissipation scheme; the motor comprises a stator, a drive end rotor, a non-drive end rotor, a rotary transformer and an outlet box;
the axial flow fan is positioned between the two rotors and fixed on the shaft;
the magnetic circuit penetrates through the non-drive-end stator, the rotor and the drive-end stator, and the magnetic steel at the same position of the rotors at the two ends is magnetized and configured according to N-S-N-S;
the stator comprises a stator core, the stator core is designed to be a core-free yoke part and is formed by radially laminating silicon steel sheets with high magnetic conductivity and low loss; the inner and outer circumferential surfaces of the stator core are provided with sector pressing plates, the sector pressing plates and the stator core on two sides are pressed and fixed along the radial direction by rivets, the stator core is sleeved with a stator winding, and the concentrated winding design is adopted;
the heat generated by the stator iron core and the windings in the slots of the stator windings realizes that the outside air enters from the ventilation holes at the non-driving end side of the outer circumference surface of the casing under the air suction/exhaust action of the built-in axial flow fan, passes through the axial flow fan through the air gap air layers at the two sides of the rotor at the non-driving end, passes through the air gap air layers at the two sides of the rotor at the driving end, finally exhausts from the ventilation holes at the driving end side of the outer circumference of the casing, and diffuses the heat into the surrounding environment; in particular, the method comprises the following steps of,
the magnetic circuit of the self-fan cold-axial flux motor with the built-in axial flow fan penetrates through the stator (1), the drive end rotor (2 b) and the non-drive end rotor (2 a), the air path adopts a built-in axial flow fan heat dissipation scheme, the built-in axial flow fan (42) mainly realizes the air path, the air is sucked from a non-drive end side air hole of the machine shell (17), flows through air gap air layers on two side end surfaces of the non-drive end rotor (2 a), enters an air inlet of the axial flow fan (42), enters air gap air layers on two sides of the drive end rotor (2 b), finally flows out from a drive end second air hole (17 b) of the machine shell (17), and exhausts air to the ambient air;
the self-fan cold axial flux motor with the built-in axial flow fan adopts a single stator/double rotor structure, a stator (1) is positioned between a non-drive end rotor (2 a) and a drive end rotor (2 b), a non-drive end cover (9), a drive end cover (6) and a shell (17) in the stator (1) are fixed through a first nut (12), a stud (13) and a second nut (14), a rotary transformer flange (10) and a drive end bearing outer cover (5) are respectively used for fixing the outer sides of bearing outer rings at two ends through a third screw (16) and a first screw (11), a check ring (7) for a first hole and a check ring (8) for a second hole are used for fixing the inner sides of bearings at two ends, an outlet box component (4) is fixed on the shell (17) through a second screw (15), the stator of a rotary transformer (3) is fixed on the non-drive end cover (9) through the third screw (16), the rotor of the rotary transformer (3) is fixed on a motor spindle (40) through a screw, so that accurate rotor position signal detection is realized;
the stator (1) comprises a stator core (24), wherein the stator core (24) is formed by radially laminating silicon steel sheets with high magnetic conductivity and low loss; a first sector pressing plate (23) and a second sector pressing plate (25) are designed on the inner and outer circumferential surfaces of the stator core (24), and the stator core (24), the first sector pressing plate (23) and the second sector pressing plate (25) are fastened along the radial direction through rivets (32); the stator winding (21) is wound on the stator core (24), the stator core (24) wound with the stator winding (21) is placed between adjacent rib plates (20 a) of the stator hub (20) by adopting a centralized winding design, and finally the stator core is fixed on the shell (17); a first ventilation hole (17 a), a second ventilation hole (17 b) and an outlet hole (1 c) are designed on the circumferential surface of the machine shell (17); because the stator core (24) and the stator winding (21) are fixed on the stator hub (20), the two sides of the inner ring of the stator (1) use fifth screws (30) and eighth screws (34) to press the second annular retainer ring (19) and the third annular retainer ring (26) against the two end faces of the second fan-shaped pressing plate (25) and are fixed on the rib plate (20 a) of the stator hub (20), the two sides of the outer ring of the stator (1) use fourth screws (29) and eighth screws (34) to press the first annular retainer ring (18) and the fourth annular retainer ring (27) against the two end faces of the first fan-shaped pressing plate (23) and are fixed on the rib plate (20 a) of the stator hub (20), the rib plate (20 a) of the stator hub (20) is fixed on the annular boss (17 d) of the casing (17) through the sixth screws (31), the limit of the rib plate (20 a) of the stator hub (20) in the circumferential direction is fixed through the trapezoidal concave table (17 e) of the casing (17), the axial direction limitation of a rib plate (20 a) of the stator hub (20) is realized through a fifth annular retainer ring (28) and an annular boss (17 d) of the shell (17); epoxy resin (22) is filled in a gap between an inner end winding of the stator winding (21) and a hub ring (20 b) of the stator hub (20), so that the heat transfer coefficient and the axial sealing property of the inner end winding of the stator winding (21) and the stator hub (20) are improved;
the rotor (2) comprises a non-drive end rotor (2 a), a drive end rotor (2 b) and an axial fan (42), wherein the non-drive end rotor comprises a non-drive end rotor back iron (45), non-drive end magnetic steel (43) and a non-drive end pressing strip (44), and the non-drive end magnetic steel (43) is fixed to the non-drive end rotor back iron (45) by using a screw and the non-drive end pressing strip (44); the driving end rotor comprises a driving end rotor back iron (37), a driving end magnetic steel (39) and a driving end pressing strip (38), the driving end magnetic steel (39) is fixed on the driving end rotor back iron (37) through a screw and the driving end pressing strip (38), a shaft retainer ring (41) is used for axial limiting of a non-driving end rotor back iron (45), and an axial flow fan (42) is connected with a motor spindle (40) through a spline pair to transmit torque;
the stator (1) and the non-drive end rotor (2 a) and the drive end rotor (2 b) move relatively through a pair of bearings, namely a first bearing (36) and a second bearing (46), wherein the first bearing (36) and the second bearing (46) are selected to be angular contact bearings or deep groove ball bearings and are respectively positioned on the outer sides of the non-drive end rotor (2 a) and the drive end rotor (2 b).
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CN206498298U (en) * | 2017-03-03 | 2017-09-15 | 宜兴华永电机有限公司 | A kind of complete machine cooling structure of novel water-cooled magneto |
CN110707871A (en) * | 2019-11-06 | 2020-01-17 | 深圳小象鸿业机电有限公司 | Forced air cooling disc type motor |
CN111864966A (en) * | 2020-08-03 | 2020-10-30 | 华中科技大学 | Integrated air-cooled axial flux motor |
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CN208209735U (en) * | 2018-06-21 | 2018-12-07 | 浙江星煜工贸有限公司 | A kind of built-in iron-core-free disc motor to radiate |
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CN206498298U (en) * | 2017-03-03 | 2017-09-15 | 宜兴华永电机有限公司 | A kind of complete machine cooling structure of novel water-cooled magneto |
CN110707871A (en) * | 2019-11-06 | 2020-01-17 | 深圳小象鸿业机电有限公司 | Forced air cooling disc type motor |
CN111864966A (en) * | 2020-08-03 | 2020-10-30 | 华中科技大学 | Integrated air-cooled axial flux motor |
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