CN112383194B - Self-cooling axial flux motor with built-in centrifugal fan - Google Patents

Self-cooling axial flux motor with built-in centrifugal fan Download PDF

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Publication number
CN112383194B
CN112383194B CN202011315225.8A CN202011315225A CN112383194B CN 112383194 B CN112383194 B CN 112383194B CN 202011315225 A CN202011315225 A CN 202011315225A CN 112383194 B CN112383194 B CN 112383194B
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China
Prior art keywords
drive
rotor
stator
back iron
centrifugal fan
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CN112383194A (en
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陈起旭
王群京
李国丽
卞晓林
刘霄
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Anhui University
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Anhui University
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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
    • 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]
    • 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
    • H02K1/32—Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium
    • 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
    • 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
    • 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)

Abstract

The invention provides a self-fan cooling axial flux motor with a built-in centrifugal fan. The device comprises a driving end stator, a non-driving end stator, a rotor, a wire outlet box, a rotary transformer, a driving end cover, a non-driving end cover and a cooling system consisting of a built-in centrifugal fan. The back iron of the rotor at the non-driving end side is used as a front disk of an impeller of the built-in centrifugal fan, the back iron of the rotor at the driving end side is used as a rear disk of the impeller of the built-in centrifugal fan, and the blades consist of the blades of the back iron of the rotor at the non-driving end side and the blades of the back iron of the rotor at the driving end side. The built-in centrifugal fan, the rotary transformer rotor and the rotor are coaxially connected. The driving end cover and the non-driving end cover are connected with the shell through screws. The stator of the rotary transformer is fixed on the cover plate at the non-driving end side, and the outlet box is fixed on the shell through screws. Thereby improving the heat exchange efficiency. The power density and the torque density are obviously improved.

Description

Self-cooling axial flux motor with built-in centrifugal fan
Technical Field
The invention relates to an integrated starting/engine applied to the fields of emergency power generation and new energy automobiles, in particular to a self-cooling axial flux motor with a built-in centrifugal fan.
Background
The integrated starting/starting motor in the fields of emergency power generation and new energy automobiles is mostly an alternating current permanent magnet synchronous motor, a direct current motor or an alternating current asynchronous motor 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 integrated starting/starting motor in the fields of emergency power generation, which have strict space requirements, portability and high power density requirements, is limited.
The conventional low-power axial flux motor generally adopts fins on a machine base or end covers on two sides for heat dissipation, 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 exchanged by the machine base fins or the end cover fins, so that the heat can not be dissipated timely, and great challenges are brought to the 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 centrifugal fan. The centrifugal fan is positioned inside the rotor back iron and is responsible for exhausting air. The air path mainly comprises two branch paths, wherein one branch path of the air path enters air from a radial fin groove formed by the non-drive end cover and the cover plate, passes through a waist-shaped hole of the non-drive end cover and a ventilation hole of a non-drive end side rotor back iron, passes through a blade of the centrifugal fan and flows out of a ventilation hole of the casing; and the other air path branch enters air from a radial fin groove formed by the drive end cover and the cover plate, passes through a waist-shaped hole of the drive end cover, a ventilation hole of the rotor back iron at the drive end side, passes through a blade of the centrifugal fan and flows out of a ventilation hole of the shell. The axial flux motor adopting the integrated built-in centrifugal fan heat dissipation scheme has the advantages that the convection heat transfer coefficients of the surfaces of radial fins of the stator inner and outer end windings, the rotor back iron, the drive end cover and the non-drive end cover and the inner circumferential surface of the kidney-shaped hole of the drive end cover and the non-drive end cover are improved through the two air path branches, heat generated by the motor is quickly dissipated 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 centrifugal fan adopts a double-stator/single-rotor framework, in order to reduce the space harmonic of a stator winding and the eddy current loss of magnetic steel, the winding adopts a distributed winding, a pole slot is matched with and selected from a design of 18 slots with 6 poles or 24 slots with 8 poles, and the magnetic steel of the rotor is radially segmented and is designed with oblique poles in the circumferential direction; the cooling scheme adopts a built-in centrifugal fan heat dissipation scheme; the motor comprises a non-driving end stator, a rotor, an outlet box and a rotary transformer;
the centrifugal fan is integrated in the rotor and is responsible for exhausting air; the back iron of the rotor at the non-driving end is provided with a vent hole and a blade, and similarly, the back iron of the rotor at the driving end is provided with a vent hole and a blade; the non-drive end rotor back iron and the drive end rotor back iron respectively play roles of an impeller front disk and an impeller rear disk, and blades of the two rotor back irons are assembled into a whole to play a role of a centrifugal fan blade; the main shaft drives the centrifugal fan to rotate, wind enters from the air holes on two sides and is thrown out from the outer circumferences of the non-driving-end rotor back iron and the driving-end rotor back iron.
Furthermore, the built-in centrifugal fan mainly realizes the flow of two air path branches; one air path branch enters air from a radial ventilation groove on the non-drive end cover, flows through a waist-shaped hole of the non-drive end cover and a ventilation hole of the non-drive end rotor back iron, and enters the interior of the centrifugal fan; the other branch enters the centrifugal fan from a radial ventilation groove on the drive end cover and flows through a waist-shaped hole of the drive end cover and a ventilation hole of the back iron of the drive end rotor. And the last two air branches are discharged from the vent hole of the shell under the action of the centrifugal fan.
Furthermore, the magnetic circuit is divided into two independent branches, wherein one branch passes through the non-drive end stator, the air gap, the non-drive end magnetic steel and the non-drive end rotor back iron; the other branch passes through a drive end stator, an air gap, drive end magnetic steel and a drive end rotor back iron; the magnetizing scheme of the magnetic steel at the same position on the two sides of the two rotor back irons is configured according to N-S-S-N.
Further, the non-driving-end stator and the driving-end stator comprise stator cores, and the stator cores are formed by winding silicon steel sheets with high magnetic permeability and low loss. The stator core is sleeved with a stator winding, and the distributed winding design is adopted.
Further, the relative motion of the non-driving end stator and the rotor is realized through a pair of bearings, the bearings are positioned on two sides of the middle rotor, and the bearings can be selected as angular contact bearings or deep groove ball bearings.
Furthermore, the driving end cover and the non-driving end cover are the same in structure, radial spoke-shaped fins distributed along the circumference are designed on the end face, ventilation grooves are formed in adjacent fins, spokes and hubs are arranged in the inner circle of the driving end cover, waist-shaped holes are designed between adjacent spokes, and the driving end cover plate are assembled to form a radial ventilation channel.
The principle of the invention is as follows: the self-fan cooling axial flux motor integrated with the built-in centrifugal 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 a distributed winding, and the magnetic steel of the rotor is segmented radially; the cooling scheme adopts a built-in centrifugal fan heat dissipation 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 self-fan-cooling axial flux motor with the built-in centrifugal fan is divided into two independent branches, wherein one branch passes through the non-drive end stator 1, the air gap, the non-drive end magnetic steel 19 and the non-drive end rotor back iron 21. The other branch passes through the stator 2 at the driving end, the air gap, the second magnetic steel 26 at the driving end and the back iron 25 of the rotor at the driving end. The magnetizing scheme of the magnetic steel at the same position on the two sides of the two rotor back irons is configured according to N-S-S-N.
The non-driving-end stator 1 and the driving-end stator 2 comprise stator cores 13, and the stator cores 13 are formed by winding silicon steel sheets with high magnetic permeability and low loss. The stator core 13 is sleeved with a stator winding 11, and a distributed winding design is adopted.
A part of heat generated by the stator core 13 and the in-slot windings of the stator winding 11 is conducted and radiated to the first fin 14b of the driving end cover 14; under the action of air suction/exhaust of the built-in centrifugal fan, the stator core 13 and the inner and outer end windings of the stator winding 11 dissipate heat through surface convection, and the heat is diffused to the surrounding environment.
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 bearings, namely a first bearing 22 and a second bearing 24, and the first bearing 22 and the second bearing 24 can be selected to be angular contact bearings or deep groove ball bearings.
The outlet box assembly 4 is fixed to the housing 6 by a fourth screw 10.
The first magnetic steel 19 and the second magnetic steel 26 in the rotor 3 adopt a radial segmented and circumferential oblique pole design in order to reduce eddy current loss and tooth harmonic.
The rotor of the rotary transformer 5 is fixed on the motor spindle 23 through the first screw 7, and the stator of the rotary transformer 5 is fixed on the non-drive-end cover plate 32 through the second screw 8, so that accurate rotor position signal detection is realized.
The invention has the beneficial effects that:
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.
In the aspect of improving the heat dissipation capacity, the design of a built-in volute-free centrifugal fan is adopted, the rotor back iron is divided into two halves in the axial direction, and the rotor back iron has the functions of an impeller front disc and an impeller rear disc of the centrifugal fan, so that the weight of the front and rear impeller discs is saved, and blades on the end face of the rotor back iron have the function of blades of the centrifugal fan. The wind path mainly realized by the built-in centrifugal fan sucks air from the end cover of the non-driving end and the radial ventilation groove of the end cover of the driving end, passes through the centrifugal fan in the back iron of the rotor and exhausts air from the shell. Under the effect of air suction/exhaust of the centrifugal fan, external air rapidly flows out to the surrounding environment through the double branches on the inner surface of the motor, so that the heat transfer efficiency and the heat exchange efficiency of the motor are improved, and the cooling and weight reduction effects of the motor are 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-driving-end stator, 2 is a driving-end stator, 3 is a rotor, 4 is an outlet box, 5 is a rotary transformer, 6 is a housing, 6a is a first ventilation hole, 14 is a driving-end cap, 14a is a first radial ventilation slot, 14c is a first kidney-shaped hole, 15 is a driving-end cover plate, 21 is a non-driving-end rotor back iron, 21b is a second ventilation hole, 25 is a driving-end rotor back iron, 25b is a third ventilation hole, 31 is a non-driving-end cap, 31a is a second radial ventilation slot, 31c is a second kidney-shaped hole, and 32 is a non-driving-end cover plate.
Fig. 2 is an exploded view of the overall structure of an axial-flux motor according to 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, 5 is a resolver, 6 is a housing, 6a is a first vent hole, 7 is a first screw, 8 is a second screw, 9 is a third screw, and 10 is a fourth screw.
Fig. 3 is an axial side view of an axial-flux motor of the present invention, where 6 is a housing, 6a is a first ventilation hole, 14 is a driving-end cover, 14a is a first radial ventilation groove, 15 is a driving-end cover plate, 31 is a non-driving-end cover, 31a is a second radial ventilation groove, and 32 is a non-driving-end cover plate.
Fig. 4 is an exploded view of a stator assembly structure of an axial flux motor according to the present invention, where 11 is a stator winding, 12 is a rib, 13 is a stator core, 13a is a rectangular groove, 14 is a driving end cover, 14a is a first radial ventilation slot, 14b is a first fin, 14c is a first kidney-shaped hole, 14d is a first spoke, 14e is a first hub, 15 is a driving end cover, 16 is a fifth screw, and 17 is a sixth screw.
Fig. 5 is a structural view of an end cover of an axial flux motor of the present invention, where 14a is a first radial ventilation slot, 14b is a fin, 14c is a first kidney-shaped hole, 14d is a second rib plate, 31a is a second radial ventilation slot, 31b is a second fin, 31c is a kidney-shaped hole, 31d is a second spoke, and 31e is a second hub.
Fig. 6 is an exploded view of a rotor assembly structure of an axial flux motor according to the present invention, in which 5 is a resolver, 7 is a first screw, 18 is a first pressing plate, 19 is a first magnetic steel, 20 is a flange, 21 is a non-driving-end rotor back iron, 21a is a first blade, 21b is a second ventilation hole, 22 is a first bearing, 23 is a motor spindle, 24 is a second bearing, 25 is a driving-end rotor back iron, 25a is a second blade, 25b is a third ventilation hole, 26 is a second magnetic steel, 27 is a second pressing plate, 28 is a seventh screw, 29 is an eighth screw, and 30 is a ninth screw.
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 centrifugal fan penetrates through the non-driving end stator 1, the driving end stator 2 and the rotor 3. The wind path adopts a built-in centrifugal fan heat dissipation scheme, and the non-drive end cover plate 32 and the non-drive end cover 31 are assembled to form a ventilation channel of the non-drive end; similarly, the drive end cover plate 15 is assembled with the drive end cap 14 to form a radial ventilation channel of the drive end. The built-in centrifugal fan mainly realizes the flow of two air path branches. One air path branch enters the centrifugal fan from a second radial ventilation groove 31a on the non-driving end cover 31 through a waist-shaped hole 31c of the non-driving end cover 31 and a ventilation hole 21b of the non-driving end rotor back iron 21; the other branch is that air enters from the first radial ventilation groove 14a on the driving end cover 14, flows through the first kidney-shaped hole 14c of the driving end cover 14 and the third ventilation hole 25b of the driving end rotor back iron 25, and enters the interior of the centrifugal fan. The last two branches of wind exit the first vent 6a of the cabinet 6. 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 centrifugal fan adopts a double-stator/single-rotor structure. The rotor 3 is positioned between the two non-driving-end stators 1 and the driving-end stator 2, and the non-driving-end stator 1, the driving-end stator 2 and the machine shell 6 are respectively fixed through a third screw 9 and a fourth screw 10. The circumferential surface of the housing 6 is formed with a first ventilation hole 6 a.
Outlet box 4 is secured to housing 6 by fourth screw 10. The stator of the rotary transformer 5 is fixed to the non-drive-end cover 31 through the second screws 8, and the rotor of the rotary transformer 5 is fixed to the main shaft 23 through the first screws 7, so that accurate rotor position signal detection is achieved. The structure of the whole motor is shown in fig. 3.
The centrifugal fan is integrated in the rotor 3, and the composition and the principle of the centrifugal fan are explained as follows:
the non-driving end rotor back iron 21 is provided with a second ventilation hole 21b and a first blade 21a, and similarly, the driving end rotor back iron 25 is provided with a third ventilation hole 25b and a second blade 25 a. The non-drive-end rotor back iron 21 and the drive-end rotor back iron 25 respectively function as a front disk of the impeller and a rear disk of the impeller, and the first blade 21a and the second blade 25a are assembled into a whole to function as a blade of the centrifugal fan. The motor spindle 23 drives the centrifugal fan to rotate, and wind enters from the second ventilation holes 21b and the ventilation holes 25b and is thrown out from the outer circumferences of the non-drive-end rotor back iron 21 and the drive-end rotor back iron 25, as shown in fig. 1 and 3.
The structure of the driving-end stator 2 is the same as that of the non-driving-end stator 1, taking the driving-end stator 2 as an example, the driving-end stator comprises a stator core 13, and the stator core 13 is formed by winding silicon steel sheets with high magnetic conductivity and low loss. The stator slots of the stator core 13 are designed with rectangular grooves 13a, and the stator core 13 is fixed to the drive end cover 14 by using fifth screws 16, sixth screws 17 and first rib plates 12. The end face of one side of the driving end cover 14 is designed with a cover plate 15 in order to plan the wind path to flow only in the direction of the radial ventilation grooves. The stator core 13 is wound with a stator winding 11, and adopts an 18-slot 6-pole or 24-slot 8-pole distributed winding design. The explosion diagram of the drive-end stator 2 is shown in fig. 4.
The driving end cover 14 is the same as the non-driving end cover 31, the end face is provided with fins 14b distributed along the circumference, adjacent fins form a first radial ventilation groove 14a, a second rib plate 14d is arranged at the inner circle position of the driving end cover 14, and a first kidney-shaped hole 14c is arranged between adjacent rib plates, as shown in fig. 5.
And the rotor 3 comprises a rotor iron core, a first magnetic steel 19, a second magnetic steel 26, a non-drive-end rotor back iron 21 and a drive-end rotor back iron 25. The first magnetic steel 19 is positioned at the outer side of the non-driving-end rotor back iron 21, the second magnetic steel 26 is positioned at the outer side of the driving-end rotor back iron 25, and the first magnetic steel 19 is pressed and fixed onto the non-driving-end rotor back iron 21 by using a seventh screw 28 and the pressing plate 18; and a ninth screw 30 and a second pressure plate 27 are used for pressing and fixing the second magnetic steel 26 on the back iron 25 of the drive-end rotor.
The non-drive-end rotor back iron 21, the drive-end rotor back iron 25 and the main shaft 23 transmit torque through a spline pair and are axially fixed by using the flange 20 and the eighth screw 29. In order to reduce the eddy current loss, the first magnetic steel 19 and the second magnetic steel 26 adopt a radial segmented and circumferential oblique pole design, as shown in fig. 6.
The relative movement between the non-driving end stator 1 and the driving end stator 2 and the rotor 3 is realized by a pair of bearings, namely a first bearing 22 and a second bearing 24, wherein the first bearing 22 and the second bearing 24 can be selected to be angular contact bearings or deep groove ball bearings and are positioned at two ends of the rotor 3, as shown in fig. 6.
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 centrifugal fan from cold axial flux motor of fan which characterized in that: a double-stator/single-rotor framework is adopted, and a cooling scheme adopts a built-in centrifugal fan heat dissipation scheme; the motor comprises a non-driving end stator, a rotor, an outlet box and a rotary transformer;
the centrifugal fan is integrated in the rotor and is responsible for exhausting air;
the built-in centrifugal fan mainly realizes the flow of two air path branches; one air path branch enters air from a radial ventilation groove on the non-drive end cover, flows through a waist-shaped hole of the non-drive end cover and a ventilation hole of the non-drive end rotor back iron, and enters the interior of the centrifugal fan; the other branch enters the centrifugal fan from a radial ventilation groove on the drive end cover and flows through a waist-shaped hole of the drive end cover and a ventilation hole of the back iron of the drive end rotor; the last two air branches are discharged from the vent holes of the machine shell under the action of the centrifugal fan;
the magnetic circuit is divided into two independent branches, wherein one branch passes through the non-drive-end stator, the air gap, the non-drive-end magnetic steel and the non-drive-end rotor back iron; the other branch passes through a drive end stator, an air gap, drive end magnetic steel and a drive end rotor back iron; the magnetizing schemes of the magnetic steel at the same position on both sides of the two rotor back irons are configured according to N-S-S-N;
the stator core is fixed by adopting a process of fixing a rib plate screw to the end cover, and the traditional process of welding the end face of the stator core and screwing the rib plate screw to the end face of the stator core is replaced;
the driving end cover and the driving end cover plate are assembled to form a radial ventilation channel;
the self-fan cold axial flux motor with the built-in centrifugal fan adopts a double-stator/single-rotor framework, the rotor (3) is positioned between two non-drive-end stators (1) and a drive-end stator (2), the non-drive-end stator (1), the drive-end stator (2) and the shell (6) are fixed through a third screw (9) and a fourth screw (10), and a first ventilation hole (6a) is designed on the circumferential surface of the shell (6);
the outlet box (4) is fixed on the shell (6) through a fourth screw (10), a stator of the rotary transformer (5) is fixed on the non-driving end cover (31) through a second screw (8), and a rotor of the rotary transformer (5) is fixed on the main shaft (23) through a first screw (7), so that accurate rotor position signal detection is realized;
the centrifugal fan is integrated in the rotor (3);
a second ventilation hole (21b) and a first blade (21a) are designed on the non-drive-end rotor back iron (21), similarly, a third ventilation hole (25b) and a second blade (25a) are designed on the drive-end rotor back iron (25), the non-drive-end rotor back iron (21) and the drive-end rotor back iron (25) respectively play a role of a front disk of an impeller and a rear disk of the impeller, the first blade (21a) and the second blade (25a) are assembled into a whole and play a role of a blade of a centrifugal fan, a motor spindle (23) drives the centrifugal fan to rotate, wind enters from the second ventilation hole (21b) and the third ventilation hole (25b) and is thrown out from the outer circumferences of the non-drive-end rotor back iron (21) and the drive-end rotor back iron (25);
the structure of the driving-end stator (2) is the same as that of the non-driving-end stator (1), the driving-end stator (2) comprises a stator core (13), the stator core (13) is formed by winding silicon steel sheets with high magnetic conductivity and low loss, a rectangular groove (13a) is designed in a stator groove of the stator core (13), the stator core (13) is fixed on a driving-end cover (14) through a fifth screw (16), a sixth screw (17) and a first rib plate (12), a cover plate (15) is designed on one side end face of the driving-end cover (14) so as to plan the flow of a wind path only in the direction of a radial ventilation groove, a stator winding (11) is wound on the stator core (13), and the design of an 18-groove 6-pole or 24-groove 8-pole distributed winding is adopted;
the driving end cover (14) is the same as the non-driving end cover (31), fins (14b) distributed along the circumference are designed on the end face, a first radial ventilation groove (14a) is formed by adjacent fins, a second rib plate (14d) is arranged at the inner circle position of the driving end cover (14), and a first waist-shaped hole (14c) is designed between the adjacent rib plates;
the rotor (3) comprises a rotor iron core, a first magnetic steel (19), a second magnetic steel (26), a non-drive-end rotor back iron (21) and a drive-end rotor back iron (25), wherein the first magnetic steel (19) is positioned on the outer side of the non-drive-end rotor back iron (21), the second magnetic steel (26) is positioned on the outer side of the drive-end rotor back iron (25), and the first magnetic steel (19) is pressed and fixed onto the non-drive-end rotor back iron (21) through a seventh screw (28) and a pressing plate (18); a ninth screw (30) and a second pressure plate (27) are used for pressing and fixing a second magnetic steel (26) to the back iron (25) of the drive-end rotor;
the non-drive end rotor back iron (21), the drive end rotor back iron (25) and the main shaft (23) transmit torque through a spline pair, a flange (20) and an eighth screw (29) are used for axial fixation, and in order to reduce eddy current loss of the non-drive end rotor back iron and the drive end rotor back iron, a first magnetic steel (19) and a second magnetic steel (26) adopt a radial segmentation and circumferential oblique pole design;
the relative motion of the non-driving end stator (1), the driving end stator (2) and the rotor (3) is realized through a pair of bearings, namely a first bearing (22) and a second bearing (24), wherein the first bearing (22) and the second bearing (24) are selected to be angular contact bearings or deep groove ball bearings and are positioned at two ends of the rotor (3).
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CN115296459A (en) * 2022-07-20 2022-11-04 陕西航空电气有限责任公司 Axial flux permanent magnet synchronous motor for propeller driving
CN116526722B (en) * 2023-03-10 2023-12-19 广东白云学院 Axial magnetic flux magnetic-yoke-free hub motor with ceramic air cooling structure

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CN101363444A (en) * 2007-08-06 2009-02-11 财团法人工业技术研究院 Micro radiator fan device
CN105576919A (en) * 2016-01-13 2016-05-11 徐俊 Disc type motor of integral cooling heat radiation structure
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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CN101363444A (en) * 2007-08-06 2009-02-11 财团法人工业技术研究院 Micro radiator fan device
CN105576919A (en) * 2016-01-13 2016-05-11 徐俊 Disc type motor of integral cooling heat radiation structure
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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