CN112383193B - Oil-cooled axial flux motor with built-in integrated double-axial-flow fan - Google Patents
Oil-cooled axial flux motor with built-in integrated double-axial-flow fan Download PDFInfo
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- CN112383193B CN112383193B CN202011315222.4A CN202011315222A CN112383193B CN 112383193 B CN112383193 B CN 112383193B CN 202011315222 A CN202011315222 A CN 202011315222A CN 112383193 B CN112383193 B CN 112383193B
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- 230000004907 flux Effects 0.000 title claims abstract description 26
- 238000004804 winding Methods 0.000 claims abstract description 37
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 36
- 239000010959 steel Substances 0.000 claims abstract description 36
- 238000001816 cooling Methods 0.000 claims abstract description 15
- 238000007654 immersion Methods 0.000 claims abstract description 9
- 239000003921 oil Substances 0.000 claims description 59
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 18
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 12
- 229910052802 copper Inorganic materials 0.000 claims description 12
- 239000010949 copper Substances 0.000 claims description 12
- 239000004593 Epoxy Substances 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 8
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 230000017525 heat dissipation Effects 0.000 claims description 5
- 229910000976 Electrical steel Inorganic materials 0.000 claims description 4
- 230000011218 segmentation Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 claims 2
- 238000012856 packing Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 210000001331 nose Anatomy 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000000758 substrate Substances 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
- H02K1/16—Stator cores with slots for windings
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—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]
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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
- H02K16/04—Machines with one rotor and two stators
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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
- H02K9/10—Arrangements for cooling or ventilating by gaseous cooling medium flowing in closed circuit, a part of which is external to the machine casing
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
- H02K9/197—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil in which the rotor or stator space is fluid-tight, e.g. to provide for different cooling media for rotor and stator
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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 an oil-cooled axial flux motor with a built-in integrated double-axial-flow fan. The axial flux motor adopts a double-stator/single-rotor topology, the double-axial-flow fans are positioned on two sides of the middle rotor, and the double-axial-flow fans and the rotor are coaxially connected. The double stators adopt a closed oil immersion circulation cooling scheme, oil through grooves are designed on a stator core and an end cover, a baffle plate is designed on the end face of the stator core, and an oil way flows in the stator along the circumferential direction along a plurality of branches of parallel Z-shaped turning tracks. On one hand, the air cooling scheme of the axial flow fan of the rotor improves the convective heat transfer coefficient of the end face of the magnetic steel and the circumferential surface of the vent hole of the end cover; on the other hand, the closed oil immersion circulation scheme of the stator improves the convective heat transfer coefficient of the stator winding and the stator core. The hybrid cooling scheme of the air cooling and stator closed oil immersion circulation of the double-axial-flow fan integrated in the motor can quickly diffuse heat generated by the stator, the rotor and the bearing into the outside air, so that the heat exchange efficiency is improved, and the improvement of power density and torque density is realized.
Description
Technical Field
The invention relates to a motor applied to the fields of pure energy vehicles, hybrid vehicles and oil drilling and production, in particular to an oil-cooled axial flux motor with a built-in integrated double-axial-flow fan.
Background
Motors in the fields of pure energy vehicles, hybrid vehicles and oil drilling and production are mostly alternating current permanent magnet synchronous motors or alternating current asynchronous motors with radial magnetic flux, 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 is limited in the occasions with strict space requirements and high power density requirements.
The conventional axial flux motor generally adopts a scheme of radiating fins or cooling water on end covers at two sides of a base or an end cover, and under the working conditions of large assembly error, large load or high rotating speed of a stator core and the end cover, a large amount of heat generated by the motor is only exchanged by the fins or the 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 an oil-cooled axial flux motor with a built-in integrated double-axial-flow fan. The axial flux motor adopts a double-stator/single-rotor topology, and the double-axial-flow fans are positioned on two sides of the middle rotor and fixed on the shaft. The air path can be divided into two air paths, wherein in one air path, air enters from the vent hole of the non-drive end cover, passes through the non-drive end axial flow fan, the non-drive end rotor magnetic steel and air gap air between the stator core and the stator core, and flows out from the vent hole on one side of the shell; and in the other air path, air enters from the air vent of the drive end cover, passes through the drive end axial flow fan, the drive end rotor magnetic steel and the air gap between the stator core and flows out from the air vent on the other side of the shell. The double stators adopt a closed oil immersion circulation cooling scheme, oil through grooves are designed on a stator core and an end cover, a baffle plate is designed on the end face of the stator core, and an oil way flows in the stator along the circumferential direction along a plurality of branches of parallel Z-shaped turning tracks. On one hand, the air cooling scheme of the axial flow fan of the rotor improves the convective heat transfer coefficient of the end face of the magnetic steel and the circumferential surface of the vent hole of the end cover; on the other hand, the closed oil immersion circulation scheme of the stator improves the convective heat transfer coefficient of the stator winding and the stator core. The hybrid cooling scheme of the air cooling of the double-axial-flow fan integrated in the motor and the closed oil immersion circulation of the stator can quickly diffuse heat generated by the motor 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:
an oil-cooled axial flux motor with a built-in integrated double-axial-flow fan is characterized in that the axial flux motor adopts a double-stator/single-rotor topology, a rotor part adopts a built-in double-axial-flow fan heat dissipation scheme, the double-axial-flow fans are positioned on two sides of a middle rotor and fixed on a shaft, double stators adopt a closed oil immersion circulation cooling scheme, a stator core and an end cover are provided with oil through grooves, the end surface of the stator core is provided with a baffle plate, and an oil path flows in the stator along the circumferential direction and flows according to a plurality of branches of parallel Z-shaped turn-back tracks; the motor comprises a non-driving end stator, a rotor, an outlet box and a rotary transformer;
the magnetic circuit penetrates through the non-drive-end stator, the rotor and the drive-end stator, and the magnetic steels at the same positions on the two sides are configured according to N-S-N-S; in order to reduce the space harmonic of the stator winding and the eddy current loss of the magnetic steel, the winding adopts a distributed winding, the rotor magnetic steel is radially segmented and distributed along circumferential oblique poles, the angle of each oblique pole is a slot pitch angle, and the pole slots adopt 18 slots and 6 poles or 24 slots and 8 poles in a matched manner;
the air path can be divided into two air paths, wherein in one air path, air enters from the vent hole of the non-drive end cover, passes through the air gap air among the non-drive end axial flow fan, the non-drive end rotor magnetic steel and the stator iron core and flows out from the vent hole at one side of the shell; the other air path is used for allowing air to enter from the vent hole of the end cover of the driving end and to flow out from the vent hole on the other side of the shell through air gaps among the axial flow fan at the driving end, the rotor magnetic steel at the driving end and the stator iron core;
the path of the oil way comprises a plurality of radial channels, an inner ring channel and an outer ring channel; the groove of the stator yoke iron core is assembled on a rectangular boss of the non-driving end cover, and the obtained fan-shaped groove forms a radial channel of an oil way; the inner end winding of the stator, the end face of the non-driving end cover, the circumferential surface of the inner circular flange of the non-driving end cover and the inner circumferential surface of the stator iron core yoke form a circumferential inner ring channel of an oil way; the space of the outer end winding of the stator, the end face of the non-driving end cover, the circumferential surface of the outer circular flange of the non-driving end cover and the outer circumferential surface of the stator core yoke part form an outer ring channel in the circumferential direction of an oil way; one end of the oil baffle plate is inserted into the rectangular groove of the outer ring boss of the non-drive end cover, and the other end of the oil baffle plate is inserted into the rectangular groove of the arched rib plate; one end of the inner ring oil baffle plate is inserted into the rectangular groove of the inner ring boss of the non-drive end cover, and the other end of the inner ring oil baffle plate is inserted into the rectangular groove of the arched rib plate; based on the polar-groove matching of 24 grooves and 8 poles, the oil circuit takes four parallel branches as a group and flows in a Z-shaped multi-branch parallel trend.
Further, the non-drive end stator and the drive end stator comprise stator cores, the stator cores are formed by winding silicon steel sheets with high magnetic conductivity and low loss, stator windings are sleeved on the stator cores, radial oil through grooves are designed on the assembly surfaces of the stator cores and the non-drive end cover, and the oil baffle plates are inserted into the rectangular grooves of the bow-shaped pressing strips and the rectangular grooves of the non-drive end cover.
Furthermore, the relative movement between the non-driving end stator and the rotor is realized through a pair of bearings, the bearings are positioned on two sides of the two axial flow fans, and the bearings can be selected as angular contact bearings or deep groove ball bearings.
Further, the outlet box assembly is fixed to the machine shell and the driving end cover and the non-driving end cover through screws.
The principle of the invention is as follows: the oil-cooled axial flux motor with the built-in integrated double-axial-flow fan adopts a double-stator/single-rotor structure, in order to reduce the space harmonic of a stator winding and the eddy current loss of magnetic steel, the winding adopts distributed windings, and the magnetic steel of the rotor is segmented radially. The rotor part adopts a built-in double axial flow fan heat dissipation scheme, and the stator part adopts a closed oil immersion circulation cooling scheme. The motor comprises a non-drive end stator 1, a drive end stator 2, a rotor 3, an outlet box 4 and a rotary transformer 5.
The magnetic circuit of the oil-cooled axial flux motor of the built-in integrated double-axial-flow fan penetrates through the non-drive-end stator 1, the rotor 3 and the drive-end stator 2.
The non-driving end stator 1 and the driving end stator 2 comprise stator cores 15, and the stator cores 15 are formed by winding silicon steel sheets with high magnetic conductivity and low loss. The stator core 15 is sleeved with a stator winding 18, and a distributed winding design is adopted. The assembling surface of the stator core 15 and the non-driving end cover 14 is designed with a radial oil through groove. The oil deflector 17 is inserted into the grooves of the arcuate web 16 and the non-drive end cap 14.
The heat generated by the stator iron core 15 and the inner and outer end windings of the stator winding 18 is taken away by circulating cooling oil; the heat generated by the second magnetic steel 32, the third magnetic steel 34 and the rotor back iron 33 is diffused to the surrounding environment by the suction/exhaust action of the double axial fans, i.e., the first axial fan 29 and the second axial fan 36.
The relative movement of the non-driving end stator 1 and the driving end stator 2 and the rotor 3 is realized by a pair of a first bearing 28 and a second bearing 37, and the first bearing 28 and the second bearing 37 can be selected to be angular contact bearings or deep groove ball bearings.
The outlet box assembly 4 is secured to the housing 6 and the non-drive end cap 14 and the drive end cap 50 by screws 12.
The first magnetic steel 31 and the fourth magnetic steel 35 in the rotor 3 adopt a radial segmentation and slant pole design along the circumferential direction in order to reduce the eddy current loss and the tooth harmonic.
The rotor of the rotary transformer 5 is fixed on the motor spindle 30 through screws, and the stator of the rotary transformer 5 is fixed on the non-drive end cover 14 through the first screws 8, so that accurate rotor position signal detection is realized.
The invention has the beneficial effects that:
(1) in the aspect of reducing loss, the stator winding adopts the design of 18-slot 6-pole or 24-slot 8-pole distributed winding, and space harmonic of the stator winding is reduced compared with fractional slot concentrated winding; the rotor magnetic steel adopts the design of radial segmentation and circumferential oblique poles, and the surface is coated with epoxy resin, so that the harmonic waves of the teeth of the stator core are weakened, and the eddy current loss of the magnetic steel is reduced.
(2) From improving the heat-sinking capability aspect, adopted the design of taking built-in double axial fan, its built-in double axial fan mainly realizes drawing wind from the axial ventilation hole of drive end cover and non-drive end cover, through the air gap air bed between axial fan, rotor and the stator, finally flows through the ventilation hole of casing. Under the air suction/exhaust action of the axial flow fans on the two sides of the rotor, outside air flows rapidly on the inner surface of the motor according to respective branches, 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 non-drive-end stator, 2 is a drive-end stator, 3 is a rotor, 4 is an outlet box assembly, 5 is a resolver, 5a is a resolver flange axial vent, 6a is a first vent, 7a is a second vent, 14a is a circular flange, and 50a is a drive-end cover axial vent.
Fig. 2 is an exploded view of the overall structure of the axial-flux motor of the present invention, where 1 is a non-drive-end stator, 2 is a drive-end stator, 3 is a rotor, 4 is an outlet box assembly, 5 is a resolver, 5a is a resolver flange axial vent hole, 6 is a housing, 6a is a first vent hole, 7 is a drive-end cover, 7a is a second vent hole, 8 is a first screw, 9 is a first nut, 10 is a stud, 11 is a second nut, 12 is a third screw, and 13 is a fourth screw.
Fig. 3 is an isometric view of an axial-flux electric machine of the present invention, where 6a is a first vent, 7a is a second vent, 14 is a non-drive-end cap, and 50 is a drive-end cap.
Fig. 4 is a sectional view of an oil path of a stator assembly of the axial flux motor of the present invention, wherein 11 is a second nut, 17 is an oil baffle, 20 is an oil inlet pipe joint, 21 is an oil outlet pipe joint, and 24 is a rectangular rubber pad.
Fig. 5 is an exploded view of a stator assembly structure of the axial flux motor of the present invention, in which 14 is a non-driving end cap, 15 is a stator core, 15a is a shallow rectangular groove, 15b is a stator groove, 15c is a first rectangular groove, 16 is an arcuate rib plate, 16a is a second rectangular groove, 16b is a third rectangular groove, 17 is an oil baffle plate, 18 is a stator winding, 19 is a cover plate, 20 is an oil inlet pipe joint, 21 is an oil outlet pipe joint, 22 is a first temperature detection plug, 23 is a second temperature detection plug, 24 is a rectangular rubber pad, 25 is a fifth screw, 26 is a sixth screw, and 27 is a seventh screw.
Fig. 6 is a structural view of an end cover of an axial flux motor of the present invention, wherein 14a is a first circular flange, 14b is a first rectangular groove, 14c is a wire outlet, 14d is an inner circular boss, 14e is an outer circular boss, 14f is a second rectangular groove, 14g is an axial vent hole, 14h is a rectangular boss, 14i is a third rectangular groove, 14j is a fourth rectangular groove, 14k is a fan-shaped groove, 14l is a through hole of a temperature detection plug, 14m is a threaded hole of a copper pipe joint, and 14n is a second circular flange.
Fig. 7 is an exploded view of a rotor assembly structure of an axial flux motor according to the present invention, in which 28 is a first bearing, 29 is a first axial fan, 30 is a motor spindle, 31 is first magnetic steel, 32 is second magnetic steel, 33 is a rotor back iron, 34 is third magnetic steel, 35 is fourth magnetic steel, 36 is a second axial fan, and 37 is a second bearing.
Fig. 8 is an exploded view of an outlet box assembly of an axial flux motor according to the present invention, wherein 38 is an outlet box housing, 39 is a copper terminal, 40 is a first thin nut, 41 is a first terminal lug, 42 is an epoxy plate, 43 is an epoxy cover plate, 44 is a circular rubber gasket, 45 is a second thin nut, 46 is a second terminal lug, 47 is a stuffing box, 48 is an eighth screw, and 49 is a ninth screw.
Fig. 9 is a structural view of a non-drive-end core 15 of an axial-flux electric machine of the present invention, where 15 is a stator core, 15a is a shallow rectangular slot, 15b is a stator slot, and 15c is a first rectangular slot.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
The magnetic circuit of the oil-cooled axial flux motor of the built-in integrated double-axial-flow fan penetrates through the non-driving-end stator 1, the driving-end stator 2 and the rotor 3. And the two air path branches adopt a double-built-in axial flow fan heat dissipation scheme. One of the air paths adopts a built-in axial flow fan 29, a second axial flow fan 36 and a mainly realized air path, and air enters from an axial vent hole 14g of the non-drive end cover 14, enters an air inlet of the second axial flow fan 36, then flows through an air gap air layer of the non-drive end stator 1 and the rotor 3 from an air outlet of the second axial flow fan 36 and flows out from a first vent hole 6a of the shell; the second air path is that air enters from the second vent hole 7a of the outer cover 7 of the drive end bearing, enters the air inlet of the axial flow fan 29 through the axial vent hole 50a of the drive end cover 50, then flows through the air gap air layer between the drive end stator 2 and the rotor 3 from the air outlet of the axial flow fan 29, and flows out from the first vent hole 6a of the casing. The cross section of the entire air passage 2D is as shown in fig. 1. The air inlet/outlet 3D mark is shown in figure 2.
The oil-cooled axial flux motor of the built-in integrated axial flow fan adopts a double-stator/single-rotor framework. The rotor 3 is positioned between the stator 1 and the stator 2, and the non-driving-end stator 1, the driving-end stator 2 and the machine shell 6 are fixed through the stud 10, the first nut 9 and the second nut 11.
The drive end bearing cover 7 is fixed to the drive end bearing cap 7 by fourth screws 13. The outlet box 4 is secured to the non-drive end cap 14, the housing 6 and the drive end cap 50 by third screws 12. The stator of the resolver 5 is fixed to the non-drive-end cap 14 by the first screws 8, and the rotor of the resolver 5 is fixed to the motor spindle 30 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 15, and the stator core 15 is formed by winding a silicon steel sheet with high magnetic conductivity and low loss. The outer circumferential surface of the non-driving end cover 14 is provided with a first temperature detection plug 22, a second temperature detection plug 23, an oil inlet pipe joint 20, an oil outlet pipe joint 21, and a rectangular rubber pad 24 arranged at the wire outlet hole 14 c. The cover plate 19 is fixed to the non-drive end cap 14 using seventh and sixth screws 27, 26. The oil circuit of the non-drive end stator 1 is in a Z-shaped multi-branch parallel connection trend along the circumferential direction. The oil path flows mainly in the space enclosed by the non-drive-end cover 14 and the cover plate 19. The assembly of the stator core 15 and stator windings 18 to the non-drive end cap 14 is described primarily below. One end face of the stator core 15 is processed with a shallow rectangular groove 15a as an assembly spigot face with a rectangular boss 14h of the non-drive-end cover 14, the other end face is processed with a stator groove 15b, and the bottom of the stator groove 15b is processed with a first rectangular groove 15 c. The arched rib 16 mainly functions to be embedded in the first rectangular groove 15c of the stator core 15, to press the stator core 15, and finally to be fixed to the non-drive-end cover 14 by the fifth screw 25. The stator winding 18 is a distributed winding and is embedded in the stator slot 15b of the stator core 15. The stator exploded view is shown in fig. 5.
The shallow rectangular groove 15a of the stator core 15 is fitted to the rectangular boss 14h of the non-drive-end cover 14, so that the sector-shaped recess 14k forms a radial passage for the oil passage. The stator winding 18 forms a circumferential channel of oil path with the end faces of the inner and outer end windings and the non-drive end cover 14. One end of an oil baffle plate 17 of the outer ring is inserted into a second rectangular groove 14f of the non-driving end cover 14, and the other end of the oil baffle plate is inserted into a third rectangular groove 16b of the arched rib plate 16; one end of the inner ring oil baffle plate 17 is inserted into the first rectangular groove 14b of the non-drive end cover 14, and the other end is inserted into the second rectangular groove 16a of the arched rib plate 16. Based on the pole-slot matching of 24 slots and 8 poles, the oil path takes four parallel branches as a group and flows in a Z-shaped trend, and the oil path circulation diagram of the whole motor is shown in fig. 4 and the explosion diagram of the stator 1 is shown in fig. 5.
The end face of the non-driving end cover 14 is designed with rectangular bosses 14h with the same number as the slots of the stator core 15. Two adjacent rectangular bosses 14h form a sector-shaped groove 14 k. A third rectangular groove 14i and a fourth rectangular groove 14j are designed at two ends of each rectangular boss 14 h. A second rectangular groove 14f and a first rectangular groove 14b are designed on the inner and outer circular ring bosses 14e and the inner circular ring boss 14d of the non-drive-end cover 14. A rectangular wire outlet groove 14c is designed on the outer circumference of the non-drive end cap 14. The non-drive end cap 14 is designed with annular flanges 14a and 14n on the inner and outer races, and the cover plate 19 is secured to the first and second annular flanges 14a and 14n of the non-drive end cap 14 by screws 26 and 27. Non-drive end cap 14, as shown in figures 6 and 9.
The rotor 3 comprises a first magnetic steel 31, a fourth magnetic steel 35, a rotor back iron 33, a first axial fan 29 and a second axial fan 36. The first axial fan 29 and the second axial fan 36 are distributed on both sides of the rotor. The first magnetic steel 31 and the fourth magnetic steel 35 are fixed to the rotor back iron 33 by screws. In order to reduce the eddy current loss and the tooth harmonic, the second magnetic steel 32 and the third magnetic steel 34 adopt a radial segmented and oblique pole design. The relative movement of the non-drive end stator 1, the drive end stator 2 and the rotor 3 is realized by a pair of first bearing 28 and second bearing 37, and the first bearing 28 and the second bearing 37 can be selected to be angular contact bearings or deep groove ball bearings as shown in figure 7.
The outlet box 4 comprises three wiring copper columns 39, the three wiring copper columns 39 are inserted into mounting holes of the epoxy substrate 42, each wiring copper column 39 is sleeved with a circular rubber pad 44, and the wiring copper columns 39 are pressed tightly on the circular rubber pads 44 through epoxy cover plates 43, ninth screws 49, wiring noses 41 and first thin nuts 40. The bottom of the wiring copper column 39 is fixed to the epoxy board 42 by pressing through the second wiring lug 46 and the second thin nut 45. The lead wires are connected to the three first wire noses 41 and then fixed by three stuffing boxes 47. The epoxy base plate 42 is secured to the outlet box housing 38 by eighth screws 48 as shown in fig. 8.
Claims (1)
1. The utility model provides a built-in integrated double axial fan's oil-cooled axial flux motor which characterized in that: the axial flux motor adopts a double-stator/single-rotor topology, a rotor part adopts a built-in double-axial-flow fan heat dissipation scheme, double-axial-flow fans are positioned on two sides of a middle rotor and fixed on a shaft, double stators adopt a closed oil immersion circulation cooling scheme, a stator core and an end cover are provided with oil through grooves, the end surface of the stator core is provided with a baffle plate, and an oil way flows along the circumferential direction in the stator along a plurality of branches of parallel Z-shaped turn-back tracks;
the motor comprises a non-driving end stator, a rotor, an outlet box and a rotary transformer; the magnetic circuit penetrates through the non-drive-end stator, the rotor and the drive-end stator, and the magnetic steels at the same positions on two sides are configured according to N-S-N-S; in order to reduce the space harmonic of the stator winding and the eddy current loss of the magnetic steel, the winding adopts a distributed winding, the rotor magnetic steel is divided in a radial direction and distributed along circumferential oblique poles, the angle of each oblique pole is a slot pitch angle, and the pole slots adopt 18-slot 6-pole or 24-slot 8-pole matching;
the stator core is sleeved with a stator winding, a radial oil through groove is designed on the assembling surface of the stator core and the non-driving end cover, and the oil baffle plate is inserted into the rectangular groove of the bow-shaped pressing strip and the rectangular groove of the non-driving end cover; in particular, the method comprises the following steps of,
the magnetic circuit of the oil-cooled axial flux motor of the built-in integrated double-axial-flow fan penetrates through the non-drive-end stator (1), the drive-end stator (2) and the rotor (3), the heat dissipation scheme of double built-in axial flow fans is adopted by two air path branches, a first built-in axial flow fan (29), a second built-in axial flow fan (36) and a main realized air path are adopted by one air path, air enters from an axial vent hole (14g) of a non-drive-end cover (14), enters an air inlet of the second axial flow fan (36), then flows through an air gap layer of the non-drive-end stator (1) and the rotor (3) from an air outlet of the second axial flow fan (36), and flows out from a first vent hole (6a) of a shell; the second air path is that air enters from a second vent hole (7a) of the outer cover (7) of the drive end bearing, enters an air inlet of the first axial flow fan (29) through an axial vent hole (50a) of the drive end cover (50), then flows through an air gap air layer between the drive end stator (2) and the rotor (3) from an air outlet of the first axial flow fan (29), and flows out from a first vent hole (6a) of the shell;
the oil-cooled axial flux motor of the built-in integrated axial flow fan adopts a double-stator/single-rotor structure, the rotor (3) is positioned between the non-drive-end stator (1) and the drive-end stator (2), and the non-drive-end stator (1), the drive-end stator (2) and the shell (6) are fixed through a stud (10), a first nut (9) and a second nut (11);
the driving end bearing outer cover (7) is fixed to the driving end bearing outer cover (7) through a fourth screw (13), the wire outlet box (4) is fixed to the non-driving end cover (14), the shell (6) and the driving end cover (50) through a third screw (12), a stator of the rotary transformer (5) is fixed to the non-driving end cover (14) through a first screw (8), and a rotor of the rotary transformer (5) is fixed to the motor spindle (30) through screws, so that accurate rotor position signal detection is achieved;
non-drive end stator (1) include stator core (15), stator core (15) are by high magnetic conductivity, low-loss silicon steel sheet is convoluteed and is formed, non-drive end cover (14) design on the periphery has first temperature to examine plug (22), second temperature examines plug (23), oil inlet pipe connector (20), oil outlet pipe connects (21), it has rectangle rubber pad (24) to design at rectangle wire outlet groove (14c), use seventh screw (27), sixth screw (26) are fixed apron (19) to non-drive end cover (14), the oil circuit of non-drive end stator (1) is along circumferencial direction, be the trend of "Z" type multiple branch parallel connection, the oil circuit mainly flows in non-drive end cover (14) and apron (19) confined space, stator core (15) and stator winding (18) and the assembling process of non-drive end cover (14): one end face of the stator core (15) is processed with a shallow rectangular groove (15a) which is used as a rectangular boss (14h) assembly spigot face of the non-drive end cover (14), the other end face is processed with a stator groove (15b), a first rectangular groove (15c) is processed at the bottom of the stator groove (15b), the arched rib plate (16) is mainly used for embedding the first rectangular groove (15c) of the stator core (15) and pressing the stator core (15), and finally the stator core (15) is fixed to the non-drive end cover (14) through a fifth screw (25), and the stator winding (18) adopts distributed windings and is embedded into the stator groove (15b) of the stator core (15);
a shallow rectangular groove (15a) of the stator core (15) is assembled on a rectangular boss (14h) of the non-drive end cover (14), so that a sector-shaped groove (14k) forms a radial channel of an oil way, a winding at the inner end and the outer end of the stator winding (18) and the end surface of the non-drive end cover (14) form a circumferential channel of the oil way, one end of an oil baffle plate (17) of the outer ring is inserted into a second rectangular groove (14f) of the non-drive end cover (14), and the other end of the oil baffle plate is inserted into a third rectangular groove (16b) of the arched rib plate (16); one end of an inner ring oil baffle plate (17) is inserted into a first rectangular groove (14b) of a non-driving end cover (14), the other end of the inner ring oil baffle plate is inserted into a second rectangular groove (16a) of an arched rib plate (16), and based on the matching of polar grooves of 24 grooves and 8 poles, an oil path takes four parallel branches as a group and flows in a Z-shaped trend;
the end face of the non-driving end cover (14) is provided with rectangular bosses (14h) with the same number as the slots of the stator core (15), two adjacent rectangular bosses (14h) form a fan-shaped groove (14k), a third rectangular groove (14i) and a fourth rectangular groove (14j) are designed at two ends of each rectangular boss (14h), a second rectangular groove (14f) and a first rectangular groove (14b) are designed on an outer circular ring boss (14e) and an inner circular ring boss (14d) of the non-driving end cover (14), a rectangular wire outlet groove (14c) is designed on the outer circumference of the non-driving end cover (14), circular flanges (14a) and (14n) are designed on the inner and outer rings of the non-driving end cover (14), and a cover plate (19) is fixed on the first circular flange (14a) and the second circular flange (14n) of the non-driving end cover (14) through a sixth screw (26) and a seventh screw (27);
the rotor (3) comprises first magnetic steel (31), fourth magnetic steel (35), a rotor back iron (33), a first axial flow fan (29) and a second axial flow fan (36), the first axial flow fan (29) and the second axial flow fan (36) are distributed on two sides of the rotor, the first magnetic steel (31) and the fourth magnetic steel (35) are fixed on the rotor back iron (33) through screws, in order to reduce eddy current loss and tooth harmonic waves of the rotor, the second magnetic steel (32) and the third magnetic steel (34) adopt a radial segmentation and oblique pole design, relative movement of the non-driving-end stator (1), the driving-end stator (2) and the rotor (3) is achieved through a pair of first bearing (28) and second bearing (37), and the first bearing (28) and the second bearing (37) are selected to be angular contact bearings or deep groove ball bearings;
outlet box (4) include three wiring copper post (39), three wiring copper post (39) insert in the mounting hole of epoxy base plate (42), every wiring copper post (39) cover has ring shape rubber pad (44), pass through epoxy apron (43) on ring shape rubber pad (44), ninth screw (49), first wiring nose (41) and first thin nut (40) compress tightly wiring copper post (39), wiring copper post (39) bottom compresses tightly fixedly to epoxy base plate (42) through second wiring nose (46) and second thin nut (45), the lead-out wire is connected with three first wiring nose (41), then it is fixed through three packing box (47), epoxy base plate (42) are fixed to outlet box casing (38) through eighth screw (48).
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| DE102021108951A1 (en) * | 2021-04-10 | 2022-10-13 | Schaeffler Technologies AG & Co. KG | electrical machine |
| CN113794301B (en) * | 2021-08-09 | 2023-03-10 | 华为数字能源技术有限公司 | Axial flux motor and vehicle |
| CN114513103B (en) * | 2022-02-28 | 2023-09-15 | 沈阳工业大学 | Brushless permanent magnet torque motor for pumping unit and speed time-varying control method |
| DE102022210419A1 (en) | 2022-09-30 | 2024-04-04 | Vitesco Technologies GmbH | Stator housing and stator for an axial flux machine |
| DE102022214345A1 (en) * | 2022-12-22 | 2024-06-27 | Baumüller Nürnberg GmbH | Liquid-cooled axial flow machine |
| FR3146248A1 (en) * | 2023-02-23 | 2024-08-30 | Michel Raoul | Axial magnetic flux electric machine equipped with a double cooling device. |
| CN116488420B (en) * | 2023-03-07 | 2023-10-13 | 扬州科光技术发展有限公司 | Overload-resistant axial flux motor |
| CN117477884B (en) * | 2023-12-26 | 2024-03-01 | 奥迪(山东)电机有限公司 | Miniaturized high-performance motor driving device |
| CN118572948B (en) * | 2024-08-02 | 2024-10-18 | 广能亿能(北京)核能科技有限公司 | Comprehensive heat dissipation system and axial flux motor |
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| 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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| CN107196480A (en) * | 2017-06-08 | 2017-09-22 | 西安交通大学 | A kind of axial magnetic flux disc-type electric motor of stator immersion oil circulating cooling and segmented armature |
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| CN110417218A (en) * | 2019-08-14 | 2019-11-05 | 苏州保邦电气有限公司 | Double-stator axial magnetic flow switch flux-linkage magneto |
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| CN102396138A (en) * | 2009-02-13 | 2012-03-28 | Isis创新有限公司 | Electric machine - flux |
| 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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