CN112383193B - Oil-cooled axial flux motor with built-in integrated double-axial-flow fan - Google Patents

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

An oil-cooled axial flux motor with built-in integrated dual axial fans

technical field

The invention relates to a motor used in 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 dual axial flow fan.

Background technique

In the fields of pure energy vehicles, hybrid vehicles, and oil drilling, the motors are mostly AC permanent magnet synchronous motors or AC asynchronous motors with radial flux. Due to the large axial installation size of traditional radial flux motors, power density and efficiency are low, and the application is limited in these occasions with strict space requirements and high power density requirements.

Conventional axial flux motors generally use fins on the base or end caps on both sides for heat dissipation or end cap water cooling. A large amount of heat generated by the motor is only exchanged by fins or water cooling, and the heat cannot be dissipated in time, which brings great challenges to the insulation and temperature rise of the motor.

SUMMARY OF THE INVENTION

In order to overcome the above disadvantages of the prior art, the purpose of the present invention is to provide an oil-cooled axial flux motor with a built-in integrated dual axial flow fan. The axial flux motor adopts a dual stator/single rotor topology, and the dual axial flow fans are located on both sides of the intermediate rotor and are fixed on the shaft. The air duct can be divided into two air ducts, one of the air ducts, the wind enters from the ventilation hole of the end cover of the non-drive end, passes through the axial flow fan at the non-drive end, the rotor magnet of the non-drive end and the stator iron core and the air between them. The air in the air gap flows out from the ventilation holes on one side of the casing; the other air path, the wind enters from the ventilation holes in the end cover of the drive end, and passes through the axial flow fan at the drive end, the rotor magnet at the drive end, and the stator iron core and the space between them. air-gap air from the vents on the other side of the case. The double stator adopts a closed oil immersion circulation cooling scheme. The stator core and end cover are designed with oil passages, and the end face of the stator core is designed with baffles. The oil circuit is in the circumferential direction inside the stator, and the multi-branch parallel "Z"-shaped return trajectory is used. flow. On the one hand, the air-cooling scheme of the axial fan of the rotor improves the convection heat transfer coefficient of the magnetic steel end face and the circumferential surface of the ventilation hole of the end cover; on the other hand, the closed oil immersion circulation scheme of the stator improves the convection of the stator winding and the stator core. heat transfer coefficient. The hybrid cooling scheme of the dual axial fan air cooling and the stator closed oil immersion circulation integrated inside the motor can quickly diffuse the heat generated by the motor to the outside air, thereby improving the heat exchange efficiency and achieving a significant increase in power density and torque density.

In order to achieve the above object, the technical scheme adopted in the present invention is:

An oil-cooled axial flux motor with built-in integrated dual axial fans. The axial flux motor adopts a dual stator/single rotor topology. The rotor part adopts a built-in dual axial fan cooling scheme. The dual axial fans are located on both sides of the intermediate rotor. , fixed on the shaft, the double stator adopts the closed oil immersion circulation cooling scheme, the stator iron core and the end cover are designed with oil passages, the end face of the stator iron core is designed with baffle plates, the oil circuit is in the circumferential direction inside the stator, and is connected in parallel by multiple branches. "Z" type foldback trajectory flow; motor includes non-drive end stator, drive end stator, rotor, outlet box, resolver;

The magnetic circuit runs through the non-drive end stator, the rotor and the drive end stator, and the magnetic steels at the same positions on both sides are arranged according to N-S-N-S; in order to reduce the space harmonics of the stator windings and the eddy current loss of the magnetic steel, the windings are distributed windings, and the rotor magnetic steel is radially segmented And the oblique poles are distributed along the circumference, the angle of each pole oblique pole is a slot pitch angle, and the pole slot is matched with 18 slots and 6 poles or 24 slots and 8 poles;

The air duct can be divided into two air ducts. In one of the air ducts, the wind enters from the ventilation hole of the end cover of the non-drive end, and passes through the air between the axial flow fan at the non-drive end, the rotor magnet of the non-drive end and the stator iron core. The air in the gap flows out from the ventilation holes on one side of the casing; the other air path, the wind enters from the ventilation holes in the end cover of the drive end, and passes through the air between the axial flow fan at the drive end, the rotor magnet at the drive end and the stator core. interstitial air, which flows from the ventilation holes on the other side of the case;

The path of the oil circuit includes multiple path direction channels, inner ring channels, and outer ring channels; the grooves of the iron core of the stator yoke are assembled to the rectangular bosses of the non-drive end cover, and the obtained fan-shaped grooves form the oil circuit. The radial channel of the stator inner end winding, the end face of the non-driving end cover, the circumferential surface of the inner ring flange of the non-driving end cover, and the inner circumferential surface of the stator core yoke form the inner ring channel of the oil passage in the circumferential direction; the stator The outer end winding, the end face of the non-drive end cover, the outer ring flange of the non-drive end cover, and the space of the outer circumferential surface of the yoke of the stator core form the outer ring channel of the oil passage in the circumferential direction; one end of the oil baffle is inserted The rectangular groove of the outer ring boss of the non-drive end cover, the other end is inserted into the rectangular groove of the arcuate rib; one end of the inner ring oil baffle is inserted into the rectangular groove of the inner ring boss of the non-drive end cover, the other end is inserted into the rectangular groove of the inner ring boss of the non-drive end cover Inserted into the rectangular groove of the arcuate rib; based on the 24-slot 8-pole pole-slot coordination, the oil circuit takes four parallel branches as a group, and flows in parallel in a "Z"-shaped multi-branch.

Further, the non-driving end stator and the driving end stator include a stator iron core, the stator iron core is wound by silicon steel sheets with high magnetic permeability and low loss, the stator iron core is sleeved with stator windings, and the stator iron core is A radial oil passage groove is designed on the assembly surface of the non-drive end cover, and the oil baffle is inserted into the rectangular groove of the bow-shaped bead and the rectangular groove of the non-drive end cover.

Further, the relative movement of the stator on the non-driving end and the stator on the driving end and the rotor is realized by a pair of bearings. The bearings are located on both sides of the two axial fans and can be selected as angular contact bearings or deep groove ball bearings.

Further, the outlet box assembly is fixed to the casing and the end cover of the driving end and the end cover of the non-driving end by screws.

The principle of the invention is that: the oil-cooled axial flux motor with built-in integrated dual axial flow fan adopts a dual stator/single rotor structure. Rotor magnets are radially segmented. The rotor part adopts the built-in double axial fan cooling scheme, and the stator part adopts the closed oil immersion circulation cooling scheme. The motor includes a non-drive end stator 1 , a drive end stator 2 , a rotor 3 , an outlet box 4 , and a resolver 5 .

The magnetic circuit of the oil-cooled axial flux motor with the built-in integrated dual axial flow fan runs 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 include a stator iron core 15, and the stator iron core 15 is formed by winding silicon steel sheets with high magnetic permeability and low loss. The stator core 15 is covered with a stator winding 18, which adopts a distributed winding design. The assembling surface of the stator core 15 and the non-drive end cover 14 is designed with radial oil passage grooves. The oil deflector 17 is inserted into the groove of the arcuate rib 16 and the non-drive end cover 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 the circulating cooling oil; Under the suction/exhaust action of the axial flow fan 29 and the second axial flow fan 36, the heat is diffused into 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 the first bearing 28 and the second bearing 37. The first bearing 28 and the second bearing 37 can be selected as angular contact bearings or deep bearings. Groove ball bearings.

The outlet box assembly 4 is fixed to the casing 6 and the non-driving end cover 14 and the driving end cover 50 by screws 12 .

The first magnetic steel 31 and the fourth magnetic steel 35 in the rotor 3 are radially segmented and designed with oblique poles along the circumferential direction in order to reduce the eddy current loss and tooth harmonics.

The rotor of the resolver 5 is fixed to the motor main shaft 30 by screws, and the stator of the resolver 5 is fixed to the non-drive end cover 14 by the first screw 8 to realize accurate rotor position signal detection.

Beneficial effects of the present invention:

(1) In terms of reducing loss, the stator winding adopts the design of 18-slot 6-pole or 24-slot 8-pole distributed winding, which reduces the space harmonics of the stator winding compared to the fractional-slot concentrated winding; the rotor magnet is radially segmented and the circumferential direction The slanted pole design, coated with epoxy resin, weakens the harmonics of the stator core teeth and reduces the eddy current loss of the magnetic steel.

(2) In terms of improving the heat dissipation capacity, the design with built-in double axial flow fan is adopted. The built-in double axial flow fan mainly realizes air suction from the axial ventilation holes of the drive end cover and the non-drive end cover, and passes the axial flow fan. , The air gap between the rotor and the stator finally flows out through the ventilation holes of the casing. Under the suction/exhaust action of the axial flow fans on both sides of the rotor, the outside air flows rapidly according to their respective branches on the inner surface of the motor, which improves the heat exchange efficiency of the motor, thereby realizing the cooling of the motor. The motor using this topology and cooling scheme can withstand larger loads, has a more compact structure, and improves the power density and torque density of the motor.

Description of drawings

1 is a cross-sectional view of the overall structure of the axial flux motor of the present invention, wherein 1 is the non-driving end stator, 2 is the driving end stator, 3 is the rotor, 4 is the outlet box assembly, 5 is the resolver, and 5a is the resolver. Flange axial ventilation holes, 6a is the first ventilation hole, 7a is the second ventilation hole, 14a is the annular flange, 50a is the driving end cover axial ventilation hole.

2 is an exploded view of the overall structure of the axial flux motor of the present invention, wherein 1 is the non-driving end stator, 2 is the driving end stator, 3 is the rotor, 4 is the outlet box assembly, 5 is the resolver, and 5a is the resolver. Flange axial ventilation hole, 6 is the casing, 6a is the first ventilation hole, 7 is the drive end cover, 7a is the second ventilation hole, 8 is the first screw, 9 is the nut one, and 10 is the double-ended stud , 11 is the second nut, 12 is the third screw, 13 is the fourth screw.

3 is an isometric view of the axial flux motor of the present invention, wherein 6a is a first ventilation hole, 7a is a second ventilation hole, 14 is a non-driving end cover, and 50 is a driving end cover.

4 is a cross-sectional view of the 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.

5 is an exploded view of the stator assembly structure of the axial flux motor of the present invention, wherein 14 is a non-drive end cover, 15 is a stator iron core, 15a is a shallow rectangular slot, 15b is a stator slot, and 15c is a first rectangular slot , 16 is the arcuate rib, 16a is the second rectangular slot, 16b is the third rectangular slot, 17 is the oil baffle, 18 is the stator winding, 19 is the cover plate, 20 is the oil inlet pipe joint, 21 is the oil outlet pipe joint, 22 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.

6 is a structural diagram of the end cover of the axial flux motor according to the present invention, wherein 14a is the first annular flange, 14b is the first rectangular groove, 14c is the outlet hole, 14d is the inner annular boss, and 14e is the outer Ring boss, 14f is the second rectangular groove, 14g is the axial ventilation hole, 14h is the rectangular boss, 14i is the third rectangular groove, 14j is the fourth rectangular groove, 14k is the fan-shaped groove, 14l is the The temperature detection plug through hole, 14m is the threaded hole of the copper pipe joint, and 14n is the second ring flange.

7 is an exploded view of the rotor assembly structure of the axial flux motor of the present invention, wherein 28 is the first bearing, 29 is the first axial flow fan, 30 is the main shaft of the motor, 31 is the first magnet steel, and 32 is the second magnet Steel, 33 is the rotor back iron, 34 is the third magnetic steel, 35 is the fourth magnetic steel, 36 is the second axial flow fan, and 37 is the second bearing.

8 is an exploded view of the structure of the outlet box assembly of the axial flux motor according to the present invention, wherein 38 is the outlet box shell, 39 is the wiring copper post, 40 is the first thin nut, 41 is the first wiring lug, and 42 is the ring Oxygen plate, 43 is an epoxy cover plate, 44 is an annular 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.

9 is a structural diagram of the non-driving end iron core 15 of the axial flux motor of the present invention, wherein 15 is a stator iron core, 15a is a shallow rectangular slot, 15b is a stator slot, and 15c is a first rectangular slot.

Detailed ways

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 with the built-in integrated dual axial flow fan runs through the non-drive end stator 1 , the drive end stator 2 and the rotor 3 . The two air branches adopt the dual built-in axial fan cooling scheme. One of the air passages adopts the built-in axial flow fan 29 and the second axial flow fan 36. The main air passage is to enter the air from the axial ventilation hole 14g of the non-driving end end cover 14 and enter the second axial flow fan 36. The air inlet, and then from the air outlet of the second axial flow fan 36, flows through the air gap air layer between the stator 1 and the rotor 3 at the non-driving end, and flows out from the first ventilation hole 6a of the casing; the second air path is from the driving end. The air enters the second ventilation hole 7a of the bearing outer cover 7, passes through the axial ventilation hole 50a of the drive end cover 50, enters the air inlet of the axial flow fan 29, and then flows through the drive end stator from the air outlet of the axial flow fan 29. 2 and the air gap air layer of the rotor 3 flows out from the first ventilation hole 6a of the casing. The 2D profile of the entire air path is shown in Figure 1. Its air inlet/outlet 3D logo is shown in Figure 2.

The oil-cooled axial flux motor with built-in integrated axial flow fan adopts a double-stator/single-rotor structure. The rotor 3 is located in the middle of the stator 1 and the stator 2. The non-driving end stator 1, the driving end stator 2, and the casing 6 are fixed by the double-ended stud 10, the nut one 9, and the second nut 11.

The drive end bearing outer cover 7 is fixed to the drive end bearing end cover 7 by the fourth screw 13 . The outlet box 4 is fixed to the non-driving end cover 14 , the casing 6 and the driving end cover 50 by the third screw 12 . The stator of the resolver 5 is fixed to the non-drive end cover 14 by the first screw 8, and the rotor of the resolver 5 is fixed to the motor main shaft 30 by the screw, so as to realize accurate rotor position signal detection. The structure diagram of the whole motor is shown in Figure 3.

The stator 1 includes a stator iron core 15, and the stator iron core 15 is formed by winding silicon steel sheets with high magnetic permeability and low loss. The non-driving end cover 14 is designed with a first temperature detection plug 22, a second temperature detection plug 23, an oil inlet pipe joint 20 and an oil outlet pipe joint 21 on the outer circumference, and a rectangular rubber pad 24 is designed in the outlet hole 14c. Use the seventh screw 27 and the sixth screw 26 to fix the cover plate 19 to the non-drive end cover 14 . The oil circuit of the non-drive end stator 1 is along the circumferential direction, in the direction of "Z"-shaped multi-branch parallel connection. The oil passage mainly flows in the space enclosed by the non-drive end cover 14 and the cover plate 19 . The following mainly introduces the assembling process of the stator core 15, the stator winding 18 and the non-drive end cover 14. FIG. One end face of the stator iron core 15 is machined with a shallow rectangular groove 15a, which serves as a stop surface for assembling with the rectangular boss 14h of the non-drive end cover 14, and the other end face is machined with a stator groove 15b, and the bottom of the stator groove 15b is machined with a third groove. A rectangular slot 15c. The main function of the arcuate rib 16 is to insert into the first rectangular slot 15c of the stator iron core 15 , press the stator iron core 15 , and finally fix it to the non-drive end cover 14 through the fifth screw 25 . The stator windings 18 are distributed windings and are embedded in the stator slots 15b of the stator iron core 15 . The exploded diagram of the stator is shown in Figure 5.

The shallow rectangular grooves 15a of the stator core 15 are fitted to the rectangular bosses 14h of the non-drive end cover 14, so that the fan-shaped grooves 14k form radial passages for the oil passages. The inner and outer end windings of the stator winding 18 and the end surface of the non-drive end cover 14 form a circumferential channel of the oil passage. One end of the oil baffle 17 of the outer ring is inserted into the second rectangular groove 14f of the non-driving end cover 14, and the other end is inserted into the third rectangular groove 16b of the arcuate rib 16; one end of the inner ring oil baffle 17 is inserted into the non-driving end. The other end of the first rectangular groove 14b of the cover 14 is inserted into the second rectangular groove 16a of the arcuate rib plate 16 . Based on the pole-slot coordination of 24 slots and 8 poles, the oil circuit takes four parallel branches as a group and flows in a "Z" shape. The oil circuit circulation diagram of the entire motor is shown in Figure 4. The explosion diagram of stator 1, As shown in Figure 5.

The non-drive end cover 14 is designed with rectangular bosses 14h in the same number as the number of slots of the stator iron core 15 on the end surface. Two adjacent rectangular bosses 14h form sector-shaped grooves 14k. A third rectangular groove 14i and a fourth rectangular groove 14j are designed at both ends of each rectangular boss 14h. A second rectangular groove 14f and a first rectangular groove 14b are designed on the inner and outer annular bosses 14e and 14d of the non-driving end end cover 14 . A rectangular wire outlet slot 14c is designed on the outer circumference of the non-driving end cover 14 . The non-drive end cover 14 is designed with annular flanges 14a and 14n on the inner and outer rings, and the cover plate 19 is fixed to the first annular flange 14a and the second annular method of the non-drive end cover 14 by screws 26 and 27 Lan 14n on. The non-drive end cover 14 is shown in FIG. 6 and FIG. 9 .

The rotor 3 includes a first magnetic steel 31 , a 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 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 its eddy current loss and tooth harmonics, the second magnetic steel 32 and the third magnetic steel 34 are designed with radial segments and inclined poles. The relative movement of the non-drive end stator 1, the drive end stator 2 and the rotor 3 is achieved by a pair of first bearings 28 and second bearings 37, which can be selected as angular contact bearings or deep grooves The ball bearing is shown in Figure 7.

The outlet box 4 includes three copper wiring posts 39, the three copper wiring posts 39 are inserted into the mounting holes of the epoxy substrate 42, and each copper wiring post 39 is covered with a circular rubber pad 44, and the circular rubber The upper surface of the pad 44 is pressed against the copper wiring post 39 through the epoxy cover plate 43 , the ninth screw 49 , the wiring nose 41 and the first thin nut 40 . The bottom of the copper wiring post 39 is pressed and fixed to the epoxy substrate 42 through the second wiring lug 46 and the second thin nut 45 . The lead wires are connected with three first terminal lugs 41 and then fixed by three stuffing boxes 47 . The epoxy base plate 42 is fixed to the outlet box housing 38 by an eighth screw 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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