CN115912734A - Axial magnetic field motor and stator cooling structure and manufacturing method thereof - Google Patents

Abstract

The invention provides an axial magnetic field motor stator and a cooling structure and a manufacturing method thereof, wherein the cooling structure comprises a stator casing, the stator casing comprises an upper metal plate, a middle partition plate and a lower metal plate which are spliced along the axial direction, a plurality of iron core mounting holes which are circumferentially arranged at intervals are arranged on the stator casing, and each iron core mounting hole sequentially penetrates through the upper metal plate, the middle partition plate and the lower metal plate; the yoke-free iron core is arranged in the iron core mounting hole and two ends of the yoke-free iron core are exposed at two sides of the stator shell; the coil is sleeved on the yoke-free iron core, and the two ends of the yoke-free iron core, which are exposed at the two sides of the stator shell, are sleeved with the coil; an upper flow channel is arranged on the splicing surface of the upper metal plate and the middle partition plate, a lower flow channel is arranged on the splicing surface of the lower metal plate and the middle partition plate, and a middle hole for communicating the upper flow channel and the lower flow channel is arranged on the middle partition plate; the coil circumferential space is not occupied, the coil slot filling rate is improved, the forming difficulty is reduced, and the manufacturability is realized.

Description

Axial magnetic field motor and stator cooling structure and manufacturing method thereof

Technical Field

The invention relates to the field of stator cooling, in particular to an axial magnetic field motor without a yoke iron core, a stator cooling structure and a manufacturing method thereof.

Background

The axial magnetic field motor is also called a disc motor, has the advantages of small volume, high torque density, high power density, high efficiency and the like, and is widely applied to the fields of electric automobiles, general industries and the like. The motor includes a housing, a stator, and a rotor, the stator and the rotor being disposed inside the housing. During the operation of the motor, heat is generated inside the stator, and the heat needs to be discharged for the reasons of safety and the working efficiency of the motor.

At present, cooling fluid is utilized to pass through a stator to discharge heat, but due to the problems of space and insulation, some non-insulated cooling fluid can only pass through the stator through a designed cooling path, for example, a disc type motor stator easy to dissipate heat is disclosed in CN216056503U, which utilizes cooling paths arranged between core windings and radially inside and outside the core windings, the cooling paths include an inner circulation channel, an outer circulation channel and water cooling channels, and the cooling fluid flows back and forth between the inner circulation channel and the outer circulation channel through each water cooling channel in sequence, although the cooling effect can be achieved, the following defects exist:

first, the heat generated by the core needs to be transferred to the cooling fluid through the coil, i.e., the core is far from the cooling path, so that the heat dissipation inside the core is poor.

Secondly, the cooling path occupies the circumferential space of the coil, reducing the occupancy rate of the windings in the slots.

Third, each coil is separated by a water cooling channel, which is not conducive to coil connection to form a winding.

Fourthly, the cooling path comprises an inner ring flow channel, an outer ring flow channel and a water cooling channel, and the complex cooling path and the high casting difficulty can be seen.

Disclosure of Invention

In order to solve the problems, the invention provides an axial magnetic field motor which directly wraps an iron core, does not occupy the circumferential space of a coil, improves the coil slot filling rate, and a stator cooling structure and a manufacturing method thereof, and simultaneously reduces the forming difficulty and realizes the manufacturability. In accordance with one object of the present invention, there is provided an axial field motor stator cooling structure comprising:

the stator casing comprises an upper metal plate, a middle partition plate and a lower metal plate which are spliced along the axial direction, a plurality of iron core mounting holes which are circumferentially arranged at intervals are formed in the stator casing, and each iron core mounting hole sequentially penetrates through the upper metal plate, the middle partition plate and the lower metal plate;

a plurality of yokes mounted in the core mounting holes such that both ends thereof are exposed to both sides of the stator case;

the coils are sleeved on the yoke-free iron core, and the two ends of the yoke-free iron core, which are exposed at the two sides of the stator shell, are sleeved with the coils;

an upper flow channel is arranged on the splicing surface of the upper metal plate and the middle partition plate, a lower flow channel is arranged on the splicing surface of the lower metal plate and the middle partition plate, and a middle hole for communicating the upper flow channel and the lower flow channel is formed in the middle partition plate;

the upper runner comprises an upper main runner and an upper branch runner, one end of the upper main runner is communicated with the upper branch runner, the other end of the upper main runner is communicated with an external water channel, and the upper branch runner is arranged around the yokeless core and forms a runner notch inside the yokeless core;

the lower runner includes a lower main runner and a lower sub-runner, the lower main runner is arranged with one end communicated with the lower sub-runner and the other end communicated with an external water channel, the lower sub-runner is arranged around the yokeless core and forms a runner notch inside the yokeless core;

the middle hole is communicated with the upper runner and the lower runner at the side of the runner notch.

As a preferred embodiment, the upper runner is communicated with the lower runner through two middle holes at two ends of the runner notch respectively, and the upper main runner is communicated with the upper runner at the outer side of the yokeless core; the lower main runner and the lower sub-runner are communicated at the outer side of the yoke-free iron core.

As a preferred embodiment, a flow breaking slit is arranged on the flow passage notch.

As a preferred embodiment, the upper main runner includes a water inlet and a water inlet loop, the water inlet loop surrounds the outer side of the yoke-free iron core, the water inlet connects the water inlet loop and the outer side wall of the upper metal plate, and the upper runner connects the water inlet loop;

the lower main runner comprises a water outlet and a water outlet loop, the water outlet loop surrounds the outer side of the yoke-free iron core, the water outlet is connected with the water outlet loop and the outer side wall of the lower metal plate, and the lower sub-runner is connected with the water outlet loop.

As a preferred embodiment, the upper runner includes a water inlet branch, an iron core outer ring upper branch and an iron core inter-core upper branch, the water inlet branch is connected between the water inlet loop and the iron core outer ring upper branch, two ends of the iron core outer ring upper branch are respectively connected with the iron core inter-core upper branch, the iron core inter-core upper branch is arranged between two adjacent yoke-free iron cores, and the runner gap is formed between the two iron core inter-core upper branches at the inner side of the yoke-free iron core;

the lower branch passage comprises a water outlet branch passage, an iron core outer ring lower branch passage and an iron core lower branch passage, the water outlet branch passage is connected between the water outlet loop passage and the iron core outer ring lower branch passage, two ends of the iron core outer ring lower branch passage are respectively connected with the iron core lower branch passage, the iron core lower branch passage is arranged between two adjacent yoke-free iron cores, and a runner notch is formed between the iron core lower branch passages on the inner sides of the yoke-free iron cores.

As a preferred embodiment, the number of the upper runners and the lower runners is multiple, and the upper runners and the lower runners are arranged at intervals.

In a preferred embodiment, an upper accommodating portion is disposed on an outer side of the upper metal plate facing away from the middle partition plate, a lower accommodating portion is disposed on an outer side of the lower metal plate facing away from the middle partition plate, and the coils located on both sides of the yoke-free core in the axial direction are disposed in the upper accommodating portion and the lower accommodating portion, respectively.

As a preferred embodiment, the method further comprises the following steps:

the slot wedges are arranged on two axial sides of the yoke-free iron core respectively, each slot wedge is inserted between two adjacent yoke-free iron cores respectively, and the coil is abutted between the slot wedges and the stator casing.

According to another object of the present invention, there is also provided an axial-field motor including the stator cooling structure of the axial-field motor of the above-described embodiment, and further including two rotors air-gap retained on both axial sides of the yokeless core.

According to another object of the present invention, the present invention further provides a method for manufacturing a cooling structure of a stator of an axial field motor, comprising the steps of:

a. providing a stator casing, wherein a plurality of iron core mounting holes are formed in the stator casing at intervals in the circumferential direction, the stator casing comprises an upper metal plate, a middle partition plate and a lower metal plate, the iron core mounting holes sequentially penetrate through the upper metal plate, the middle partition plate and the lower metal plate, the upper metal plate is provided with an upper splicing part, an upper flow channel is formed in the upper splicing part, the lower metal plate is provided with a lower splicing part, a lower flow channel is formed in the lower splicing part, and a plurality of middle holes are formed in the middle partition plate;

b. splicing the middle partition plate between the upper splicing part and the lower splicing part so as to enable the middle hole to communicate the upper flow channel and the lower flow channel;

c. inserting a yoke-free iron core into the iron core mounting hole;

d. and coils are sleeved on two axial sides of the yoke-free iron core and are kept on two axial sides of the stator casing.

Compared with the prior art, the technical scheme has the following advantages:

the stator casing keeps in the middle section of no yoke iron core, and the cover is located two of no yoke iron core the coil keeps the axial both sides of stator casing, can make like this set up in the stator casing go up the runner with down the runner, simultaneously with no yoke iron core with the coil carries out the contact heat transfer, effectively promotes the cooling effect.

Because the two coils sleeved on the yoke-free iron core are kept at the two axial sides of the stator casing, so that the coils at the same side are connected and form a winding, compared with the traditional coil arrangement between the iron core and a stator cooling structure, the problem that the circumferential space design is increased and the defect that the occupancy rate of the windings in the slots is low is avoided.

The stator casing is the components of a whole that can function independently structure to in processing formation go up the runner with lower runner, later will go up the metal sheet the intermediate bottom with the metal sheet concatenation down can, realize manufacturability, reduce the casting degree of difficulty. And the middle hole is arranged on the middle partition plate, so that the cooling medium can circulate between the upper flow channel and the lower flow channel, and the upper flow channel and the lower flow channel are axially arranged along the yoke-free iron core, thereby increasing the heat exchange area, improving the fluidity and further enhancing the cooling performance.

The invention is further described with reference to the following figures and examples.

Drawings

Fig. 1 is a schematic structural diagram of a stator cooling structure of an axial field motor according to the present invention;

FIG. 2 is a front view of the stator housing of the present invention;

FIG. 3 isbase:Sub>A sectional view taken along line A-A of FIG. 2;

FIG. 4 is a schematic structural view of the intermediate partition according to the present invention;

FIG. 5 is a schematic structural view of a first embodiment of the upper metal plate according to the present invention;

FIG. 6 is a schematic structural view of a first embodiment of a lower metal plate according to the present invention;

FIG. 7 is a schematic view of a first embodiment of the combination of the upper flow path and the lower flow path of the present invention;

FIG. 8 is a schematic structural view of a second embodiment of the upper metal plate according to the present invention;

FIG. 9 is a schematic structural view of a second embodiment of the lower metal plate according to the present invention;

FIG. 10 is a schematic view of a second embodiment of the combination of the upper flow path and the lower flow path of the present invention;

FIG. 11 is a schematic structural view of a third embodiment of the upper metal plate according to the present invention;

FIG. 12 is a schematic structural view of a third embodiment of the lower metal plate according to the present invention;

FIG. 13 is a schematic view of a third embodiment of the combination of the upper flow path and the lower flow path of the present invention;

FIG. 14 is a schematic view showing the structure of a third embodiment of the combination of the upper flow path and the lower flow path of the present invention;

FIG. 15 is an exploded view of an axial field electric machine according to the present invention;

FIG. 16 is a cross-sectional view of the axial field motor of the present invention taken along the gap of the core mounting holes;

FIG. 17 is a cross-sectional view taken along the center of the core mounting hole in an axial field electric motor according to the present invention;

FIG. 18 is a schematic structural view of another embodiment of a stator housing according to the present invention;

FIG. 19 is a schematic view of the vortex path in the stator of the present invention.

Detailed Description

The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The underlying principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.

First embodiment

As shown in fig. 1 to 3, the axial field motor stator cooling structure includes:

the stator casing 110 comprises an upper metal plate 111, a middle partition plate 112 and a lower metal plate 113 which are spliced along the axial direction, the stator casing 110 is provided with a plurality of iron core mounting holes 110a which are arranged at intervals in the circumferential direction, and each iron core mounting hole sequentially penetrates through the upper metal plate 111, the middle partition plate 112 and the lower metal plate 113;

a plurality of yolkless cores 120 installed in the core installation holes 110a such that both ends thereof are exposed to both sides of the stator case 110;

the coils 130 are sleeved on the yokeless core 120, and the coils 130 are sleeved on both ends of the yokeless core 120 exposed at both sides of the stator housing 110;

an upper flow passage 111a is provided on a surface where the upper metal plate 111 and the middle partition plate 112 are joined, a lower flow passage 113a is provided on a surface where the lower metal plate 113 and the middle partition plate 112 are joined, and a middle hole 112a communicating the upper flow passage 111a and the lower flow passage 113a is provided on the middle partition plate 112.

When the iron core 120 is inserted into the iron core mounting hole 110a, the stator housing 110 is held at the middle section of the iron core 120, and the two coils 130 sleeved on the iron core 120 are held at both axial sides of the stator housing 110, so that the upper flow passage 111a and the lower flow passage 113a provided in the stator housing 110 can exchange heat with the iron core 120 and the coils 130 in a contact manner, and the cooling effect is effectively improved. In addition, since the two coils 130 sleeved on the yoke-free core 120 are maintained at both axial sides of the stator housing 110, so that the coils 130 at the same side are connected and form a winding, compared with the conventional coil arrangement between the core and the stator cooling structure, the problem of increased circumferential space design and low occupancy rate of windings in slots is avoided. In addition, the stator casing 110 is a split structure, so that the upper flow channel 111a and the lower flow channel 113a are formed by machining, and then the upper metal plate 111, the middle partition plate 112 and the lower metal plate 113 are spliced, so that manufacturability is achieved, and casting difficulty is reduced. And the middle hole 112a is provided in the middle partition 112, so that the cooling medium can be circulated between the upper flow passage 111a and the lower flow passage 113a, and the upper flow passage 111a and the lower flow passage 113a are axially arranged along the yokeless core 120, thereby increasing a heat exchange area, improving fluidity, and further enhancing cooling performance.

As shown in fig. 2 to 6, 8, 9, 11, 12 and 15, the upper metal plate 111 has an upper splicing portion 1112 and an upper accommodating portion 1111 which are opposite to each other, and a plurality of core upper mounting portions 1113 which penetrate the upper splicing portion 1112 and the upper accommodating portion 1111, the lower metal plate 113 has an lower splicing portion 1132 and a lower accommodating portion 1131 which are opposite to each other, and a plurality of core lower mounting portions 1133 which penetrate the lower splicing portion 1132 and the lower accommodating portion 1131, the middle partition plate 112 is provided with a plurality of core middle mounting portions 1123 and a plurality of middle holes 112a, and the core middle mounting portions 1123 and the middle holes 112a are spaced apart from each other. After the middle partition 112 is spliced between the upper splicing part 1112 and the lower splicing part 1132, the core upper mounting part 1113, the core middle mounting part 1123 and the core lower mounting part 1133 correspondingly form a core mounting hole 110a, and the middle hole 112a is communicated with the upper flow passage 111a and the lower flow passage 113a.

Specifically, the upper metal plate 111, the middle partition 112 and the lower metal plate 113 are substantially sheet-shaped to assemble the stator housing 110 in a disk shape, that is, the axial dimension of the stator housing 100 is small to embody the characteristic of small axial dimension of the axial magnetic field motor. The intermediate partition 112 is the thinnest and may be made of metal or nonmetal, and the outer contour of the stator housing 110 may be circular or square, and a through hole is formed in the center of the stator housing 110 for installing the rotating shaft 300 and the bearing 400, as shown in fig. 15. In addition installation department 1113 on the iron core installation department 1123 in the iron core with installation department 1133 under the iron core's shape is unanimous, all is trapezoidal to correspond and form trapezoidally iron core mounting hole 110a is trapezoidal with the adaptation installation no yoke core 120 refers to fig. 2 and fig. 15, wherein the trapezoidal upper base of iron core mounting hole 110a sets up inwards, the trapezoidal lower base of iron core mounting hole 110a sets up outwards.

More specifically, the upper metal plate 111 is provided with an upper flow passage opening groove 111a0, the middle partition plate 112 covers the upper flow passage opening groove 111a0 to form the upper flow passage 111a, the lower metal plate 113 is provided with a lower flow passage opening groove 113a0, and the middle partition plate 112 covers the lower flow passage opening groove 113a0 to form the lower flow passage 113a.

The upper flow path 111a and the lower flow path 113a may be formed by processing the upper flow path opening groove 111a0 at the upper joint part 1112 where the upper metal plate 111 is exposed, and processing the lower flow path opening groove 113a0 at the lower joint part 1132 where the lower metal plate 113 is exposed, and then jointing the intermediate partition 112 between the upper metal plate 111 and the lower metal plate 113. And the middle hole 112a is connected to and communicates with the upper flow path opening groove 111a0 and the lower flow path opening groove 113a0, respectively, and the upper flow path opening groove 111a0 and the lower flow path opening groove 113a0. In addition, the upper metal plate 111, the middle partition plate 112 and the lower metal plate 113 can be formed by punching, so that the casting difficulty is reduced, the exposed upper flow channel open groove 111a0 and the exposed lower flow channel open groove 113a0 are convenient to clean, and the problems that the inner wall is rough and cannot be cleaned after the water channel is processed and formed, and the blockage is easy to occur are solved.

Referring to fig. 3, the middle partition plate 112 is hermetically connected to the upper metal plate 111 and the lower metal plate 113, and the hermetic connection includes disposing a sealant, a sealing ring, or welding. Taking the upper metal plate 111 and the middle partition plate 112 as an example, a sealant is disposed between the middle partition plate 112 and the upper splicing portion 1112 of the upper metal plate 111, so as to ensure the sealing property between the two, and prevent a cooling medium (including cooling water, cooling oil or cooling gas) from leaking.

The middle partition 112 is a flexible material plate, such as a rubber plate, and the upper metal plate 111 and the lower metal plate 113 are heat conductive metal plates, so as to improve the supporting and heat exchanging capabilities thereof.

Referring to fig. 1, the upper metal plate 111, the middle partition plate 112, and the lower metal plate 113 are arranged along an axial direction of the yokeless core 120, the upper receiving portion 1111 is used for arranging the coil 130, the upper flow channel 111a provided on the upper splicing portion 1112 can cool the coil 130 in the upper receiving portion 1111, similarly, the lower flow channel 113a provided on the lower splicing portion 1132 can cool the coil 130 in the lower receiving portion 1131, and the upper flow channel 111a and the lower flow channel 113a can simultaneously cool the yokeless core 120, so that space is reasonably utilized, and cooling capability of the coil 130 and the yokeless core 120 is effectively ensured.

The upper flow path 111a and the lower flow path 113a are partitioned by the intermediate partition plate 112 and are communicated only through the intermediate hole 112a, so that the cooling medium can sufficiently pass through the upper flow path 111a and the lower flow path 113a, thereby enhancing the cooling effect.

As shown in fig. 1 and 15, the axial-field motor stator cooling structure 100 further includes:

the slot wedges 140 are respectively disposed on two axial sides of the yokeless cores 120, each slot wedge 140 is respectively inserted between two adjacent yokeless cores 120, and the coil 130 abuts between the slot wedge 140 and the stator housing 110.

Specifically, both circumferential sides of the yokeless core 120 are respectively disposed in the core slots 121, and the slot wedges 140 are respectively inserted into the core slots 121 of two adjacent yokeless cores 120 in the radial direction, so as to fix the coil 130 between the slot wedges 140 and the stator housing 110.

Referring to fig. 1 and 3, the upper receiving portion 1111 and the lower receiving portion 1131 are both caulking grooves so that the coil 130 can be embedded in the upper receiving portion 1111 and the lower receiving portion 1131, and the coil 130 abuts between the caulking groove bottom and the slot wedge 140. The yokes-less iron core 120 and the slot wedges 140 are substantially flush with the axial side of the stator housing 110, and a gap exists between the coil 130 and the side wall of the caulking groove, which can be used for filling potting adhesive, that is, the upper receiving portion 1111 and the lower receiving portion 1131 are filled with potting adhesive, so that the stator housing 110, the coil 130, the yokes-less iron core 120, and the like are fixed.

Further, the wire connecting portion 131 of the coil 130 is located radially outward thereof, and the wire connecting portion 131 is located in a gap between the coil 130 and the side wall of the caulking groove, and wiring between the coils 130 on the same side can be performed in the gap. Specifically, the coils 130 may be sleeved on the yokes-less cores 120 one by one, and then the wiring between the coils 130 may be performed between the coils 130 and the caulking groove side walls, which may facilitate the connection of the coils 130 to form a winding. Of course, the coils 130 on the same side can be connected to form a whole by the wire connecting portion 131, and then be taken down together to the iron core 120.

As shown in fig. 1, an insulating heat-conducting member is disposed between the yoke-free core 120 and the coil 130, and the insulating heat-conducting member may be a ceramic sheet or an insulating paper, so as to ensure the insulating heat-conducting between the two, and avoid eddy current loss, which affects the operation performance of the motor. Specifically, the outer periphery of the iron core 120 may be wrapped with an insulating paper, and then the coil 130 may be wrapped around the insulating paper, so as to achieve insulation between the iron core 120 and the coil 130. Note that, both axial end surfaces of the yokeless core 120 are air gap surfaces, and the insulating paper should avoid shielding.

And an insulating heat-conducting member may be disposed between the coil 130 and the stator case 110, and the insulating heat-conducting member is disposed between the coil 130 and the bottom of the caulking groove to insulate the coil 130 from the stator case 110.

Second embodiment

The axial-field motor stator cooling structure of the second embodiment differs from the first embodiment in that, referring to fig. 4 to 6, the upper flow passage 111a includes an upper main flow passage 111a1 and an upper branch flow passage 111a2, the upper main flow passage 111a1 is arranged with one end communicating with the upper branch flow passage 111a2 and the other end communicating with an external water passage, the upper branch flow passage 111a2 is arranged around the yokeless core 120 and forms a flow passage notch 1110a inside the yokeless core 120;

the lower runner 113a includes a lower main runner 113a1 and a lower sub-runner 113a2, the lower main runner 113a1 is disposed such that one end is communicated with the lower sub-runner 113a2 and the other end is communicated with an external water channel, the lower sub-runner 113a2 is disposed around the yokeless core 120 and forms a runner notch 1110a inside the yokeless core 120;

the intermediate hole 112a communicates the upper branch passage 111a2 and the lower branch passage 113a2 on the flow passage notch 1110a side.

The number of the upper branch flow channel 111a2 and the lower branch flow channel 113a2 is plural, the upper main flow channel 111a1 is communicated with an external water channel, and a cooling medium introduced from the outside is introduced into the plural upper branch flow channels 1111a, then each of the upper branch flow channels 1111a introduces the cooling medium into the lower branch flow channel 113a2 through the middle hole 112a, then the cooling medium flows into the lower main flow channel 113a1, and finally is discharged through the external water channel connected to the lower main flow channel 113a 1. The upper runner 111a and the lower runner 113a are axially spaced along the yokeless core 120, and the upper runner 111a2 and the lower runner 113a2 are respectively arranged around the yokeless core 120, so that the heat exchange area is increased, and the cooling medium uniformly passes through the upper runner 111a and the lower runner 113a, thereby improving the cooling effect.

As shown in fig. 4 and 6, the upper runner 111a2 communicates with the lower runner 113a2 at both ends of the runner notch 1110a through two intermediate holes 112a, respectively, and the upper main runner 111a1 communicates with the upper runner 111a2 at the outside of the yokeless core 120; the lower main runner 113a1 communicates with the lower sub-runner 113a2 at the outside of the yokeless core 120.

The upper main runner 111a1 is located at a radial outer side of the yokeless core 120, the lower main runner 113a1 is also located at a radial outer side of the yokeless core 120, the upper sub-runners 111a2 and the lower sub-runners 113a2 are arranged at intervals, the upper sub-runners 111a2 and the lower sub-runners 113a2 are respectively arranged around the yokeless core 120, and in addition, because the runner notches 1110a are located at a radial inner side of the yokeless core 120, heat exchange areas between the upper sub-runners 111a2 and the lower sub-runners 113a2 and the yokeless core 120 are respectively increased, so that cooling performance is improved.

As shown in fig. 5 and 6, the upper main flow passage 111a1 includes a water inlet 111a11 and a water inlet loop 111a12, the water inlet loop 111a12 surrounds the outside of the yokeless core 120, the water inlet 111a11 connects the water inlet loop 111a12 with the outer side wall of the upper metal plate 111, and the upper sub flow passage 111a2 connects the water inlet loop 111a12;

the lower main runner 113a1 includes a water outlet 113a11 and a water outlet loop 113a12, the water outlet loop 113a12 surrounds the outside of the yokeless core 120, the water outlet 113a11 connects the water outlet loop 113a12 with the outer side wall of the lower metal plate 113, and the lower sub-runner 113a2 connects the water outlet loop 113a12.

The water inlet 111a11 and the water outlet 113a11 are used for communicating with an external water channel, and include connecting an external water pipe and the like to communicate with the external water channel. The water inlet 111a11 is used for introducing a cooling medium, and the water outlet 113a11 is used for discharging the cooling medium, preferably, after the middle partition plate 112 is spliced between the upper metal plate 111 and the lower metal plate 113, the water inlet 111a1 and the water outlet 113a1 are arranged in a right-facing manner, so that external pipelines and management are conveniently centralized. The water inlet loop 111a12 and the water outlet loop 113a12 are sequentially connected end to end.

With continued reference to fig. 5 and 6, the upper flow passage 111a2 includes a water inlet branch 111a21, an iron-core-outer-ring upper branch 111a22, and an inter-iron-core upper branch 111a23, the water inlet branch 111a21 is connected between the water inlet loop 111a12 and the iron-core-outer-ring upper branch 111a22, two ends of the iron-core-outer-ring upper branch 111a22 are respectively connected to the inter-iron-core upper branches 111a23, the inter-iron-core upper branch 111a23 is disposed between two adjacent non-yoke iron cores 120, and the flow passage notch 1110a is formed between the two inter-iron-core upper branches 111a23 inside the non-yoke iron cores 120;

the lower branch passage 113a2 includes a water outlet branch 113a21, an iron core outer ring lower branch 113a22, and an inter-iron core lower branch 113a23, the water outlet branch 113a21 is connected between the water outlet loop 113a12 and the iron core outer ring lower branch 113a22, two ends of the iron core outer ring lower branch 113a22 are respectively connected to the inter-iron core lower branch 113a23, the inter-iron core lower branch 113a23 is disposed between two adjacent yokes 120, and a flow channel gap 1110a is formed between the two inter-iron core lower branches 113a23 inside the yokes 120.

The number of the upper runners 111a2 and the lower runners 113a2 is plural, and after the middle partition plate 112 is spliced between the upper metal plate 111 and the lower metal plate 113, the upper runners 111a2 and the lower runners 113a2 are arranged at intervals, so that the yokes 120 can be arranged around the runners, and the cooling medium can uniformly pass through the runners.

As shown in fig. 5, the flow channel notch 1110a is formed between the upper leg 111a23 between two adjacent iron cores and located inside the unyoked iron core 120. As shown in fig. 6, the flow channel notch 1110a is formed between the lower arms 113a23 of the two adjacent iron cores inside the unyoked iron core 120.

As shown in fig. 4 to 7, a cooling medium is introduced through the water inlet 111a11, flows into the iron core outer ring upper branch 111a22 connected to the water inlet loop 111a12 through the plurality of water inlet branches 111a21, flows into the two iron core intermediate upper branches 111a23 connected to the iron core outer ring upper branches 111a22, flows into the corresponding iron core intermediate lower branches 113a23 through the intermediate holes 112a, and flows through the iron core outer ring lower branches 113a22 until flowing into the water outlet loop 113a21, and is finally collected and discharged from the water outlet 113a11, so that a cooling flow path is reasonably designed, that not only is a heat exchange area increased, the fluidity of the cooling medium is improved, and a problem that a part of heat cannot be discharged in time or a temperature gradient is large due to design limitations of the cooling path is avoided, thereby causing an adverse effect on a stator or a problem that a motor cannot achieve a satisfactory output capability.

As shown in fig. 18, the flow channel notch 1110a is provided with a flow blocking slit 1110a1, the flow blocking slit 1110a1 axially penetrates through the stator casing 110 and communicates with the core mounting hole 110a and the inner side wall of the stator casing 110, each core mounting hole 110a communicates with one flow blocking slit 1110a1, and the flow blocking slit 1110a1 extends in the radial direction to block the stator eddy path 1001 where it is located, referring to fig. 19. Further, each of the cores 120 generates a stator eddy current path 1001, the stator eddy current path 1001 is composed of a plurality of elliptical loop paths arranged from inside to outside, the flow interruption slit 1110a1 is a slit which is radially arranged and axially penetrates through the stator casing 110, and the slit interrupts each elliptical loop path, thereby achieving the effect of reducing eddy current loss. In addition, a closed ring can be additionally arranged on the inner side wall of the stator casing 110, the closed ring can be made of metal, and an insulating part can be additionally arranged between the stator casing 110 and the closed ring, so that the structural strength is ensured, and the insulating effect is realized.

Third embodiment

The stator cooling structure of the axial-field motor of the third embodiment is different from that of the second embodiment in that, referring to fig. 8 to 10, the upper flow passage 111a includes a plurality of upper water passages 111a3 extending in the radial direction, the upper water passages 111a3 are arranged between adjacent yokes-free cores 120 and leave upper ports 111a31 inside the yokes-free cores 120, and adjacent two upper water passages 111a3 are separated from each other inside the yokes-free cores 120 to form a blocking space 1110b;

the lower waterway 113a includes a plurality of lower waterway 113a3 extending in a radial direction, the lower waterway 113a3 is disposed between adjacent yokes 120 and leaves a lower port 113a31 inside the yokes 120, and two adjacent lower waterways 113a3 are separated from each other inside the yokes 120 to form a blocking space 1110b;

the intermediate partition 112 is provided with an intermediate hole 112a, and the intermediate hole 112a communicates the upper port 111a31 of the upper water passage 111a3 and the lower port 113a31 of the lower water passage 113a3 inside the yoked core 120.

After the middle partition 112 is spliced between the upper metal plate 111 and the lower metal plate 113, the upper water channels 111a3 and the lower water channels 113a3 are in one-to-one correspondence. By providing the blocking space 1110b, the corresponding upper waterway 111a3 and the corresponding lower waterway 113a3 are communicated through the middle hole 112a. The upper port 111a31 and the lower port 113a31 are both located on the radial inner side of the yokeless core 120, so that the heat exchange area is ensured, and the cooling performance is improved.

Referring to fig. 8 and 9, the upper fluid passage 111a further includes a water inlet 111a11 and a water inlet loop 111a12, the water inlet loop 111a12 surrounds the outside of the yokeless core 120, the water inlet 111a11 connects the water inlet loop 111a12 with the outer side wall of the upper metal plate 111, and the upper water passage 111a3 connects the water inlet loop 111a12;

the lower flow passage 113a further includes a water outlet 113a11 and a water outlet loop 113a12, the water outlet loop 113a12 surrounds the outside of the yokeless core 120, the water outlet 113a11 connects the water outlet loop 113a12 with the outer side wall of the lower metal plate 113, and the lower water passage 113a3 connects the water outlet loop 113a12.

As shown in fig. 8 to 10, the cooling medium is introduced through the water inlet 111a11, flows along the water inlet loop 111a12, and passes through the plurality of inter-core upper branches 111a3, the cooling medium in the inter-core upper branches 111a3 flows into the inter-core lower branches 113a3 through the middle hole 112a, then flows into the water outlet loop 113a12, and is finally collected and discharged from the water outlet 113a11, and the cooling flow path is reasonably designed, so that not only is the heat exchange area increased, but also the fluidity of the cooling medium is improved, and it is avoided that part of heat cannot be discharged in time or the temperature gradient is large due to design limitations of the cooling path, and further adverse effects on the stator are generated or the motor cannot achieve satisfactory output capacity.

To reduce eddy current loss, a cutoff slit 1110a1 may be also provided on the blocking space 1110 b. For details, reference may be made to the cutout 1110a1 of the second embodiment, which is not described herein.

Fourth embodiment

An axial-field motor stator cooling structure of the fourth embodiment differs from the second embodiment in that, with reference to fig. 11 to 14, the upper flow passage 111a includes an upper main flow passage 111a1, a first upper flow passage 111a4, and a second upper flow passage 111a5, the upper main flow passage 111a1 communicates with the first upper flow passage 111a4, the second upper flow passage 111a5 is provided independently, the first upper flow passage 111a4 and the second upper flow passage 111a5 are arranged around the yokeless core 120 and form a flow passage notch 1110a inside the yokeless core 120;

the lower runner 113a includes a lower main runner 113a1, a first lower runner 113a4, and a second lower runner 113a5, the lower main runner 113a1 communicates with the first lower runner 113a4, the second lower runner 113a5 is independently provided, the first lower runner 113a4 and the second lower runner 113a5 are arranged around the yokeless core 120 and form a runner notch 1110a inside the yokeless core 120;

the middle partition 112 is provided with a middle hole 112a, the middle hole 112a is disposed at both sides of the flow channel notch 1110a, the first upper branch channel 111a4 and the second lower branch channel 113a5 are communicated through the middle hole 112a, the second upper branch channel 111a5 and the first lower branch channel 113a4 are communicated through the middle hole 112a, and the second upper branch channel 111a5 and the second lower branch channel 113a5 are communicated through the middle hole 112a.

The upper main flow passage 111a1 serves to guide the cooling medium to the first upper branch flow passage 111a4 communicated therewith, and then the first upper branch flow passage 111a4 guides the cooling medium to the second lower branch flow passage 113a5 through the middle hole 112a, the second lower branch flow passage 113a5 guides the cooling medium to the second upper branch flow passage 111a5 through the middle hole 112a, and the second upper branch flow passage 111a5 guides the cooling medium to the first lower branch flow passage 113a4 through the middle hole 112a, and finally discharges the cooling medium through the lower main flow passage 113a 1.

As can be seen, the first upper runner 111a4, the second lower runner 113a5, the second upper runner 111a5, and the first lower runner 113a4 are sequentially communicated. And after the middle partition plate 112 is spliced between the upper metal plate 111 and the lower metal plate 113, the first upper runner 111a4, the second lower runner 113a5, the second upper runner 111a5 and the first lower runner 113a4 which are sequentially communicated are partially staggered and extend in the circumferential direction in sequence, so that water channels are uniformly distributed around each yoke-free core 120, and the cooling effect is ensured.

Referring to fig. 11 and 12, the second upper runner 111a5 includes a plurality independent of each other, and the first upper runner 111a4 includes a plurality independent of each other. Similarly, the second lower runner 113a5 includes a plurality of lower runners independent of each other, and the first lower runner 113a4 includes a plurality of lower runners independent of each other.

Specifically, the number of the first upper branch channels 111a4 is two, and the first upper branch channels 111a4 are respectively connected to two ends of the upper main channel 111a1, the number of the second lower branch channels 113a5 is four, and each of the first upper branch channels 111a4 corresponds to two of the second lower branch channels 113a5, so that two sides of the first upper branch channels 111a4 are respectively communicated with the second upper branch channels 111a5 through one of the second lower branch channels 113a 5.

With continued reference to fig. 11 and 12, the first upper runner 111a4 includes a first water inlet runner 111a41, a first core-outer-ring upper runner 111a42, and a first inter-core upper runner 111a43, the first water inlet runner 111a41 connects between the upper main runner 111a1 and the first core-outer-ring upper runner 111a42, the first core-outer-ring upper runner 111a42 connects two first inter-core upper runners 111a43, and the first inter-core upper runner 111a43 is disposed between two adjacent non-yoke cores 120;

the second upper runner 111a5 includes a second core outer ring upper branch 111a52 and a second core upper branch 111a53, the second core outer ring upper branch 111a52 connects three second core upper branches 111a53, and the second core upper branches 111a53 are disposed between two adjacent yokes 120;

the first lower branch passage 113a4 includes a first water outlet branch 113a41, a first core outer ring lower branch 113a42, and a first inter-core lower branch 113a43, the first water outlet branch 113a41 connects the lower main branch passage 113a1 and the first core outer ring lower branch 113a42, the first water outlet branch 113a41 connects the center of the first core outer ring lower branch 113a42, the first core outer ring lower branch 113a42 connects four first inter-core lower branches 113a43, and the first inter-core lower branch 113a43 is disposed between two adjacent yokes 120;

the second lower runner 113a5 includes a second core outer ring lower runner 113a52 and a second inter-core lower runner 113a53, the second core outer ring lower runner 113a52 connects two of the second inter-core lower runners 113a53, and the second inter-core lower runners 113a53 are disposed between two adjacent non-yoke cores 120.

The upper main runner 111a1 includes a water inlet 111a11 and a water inlet loop 111a12, the water inlet loop 111a12 surrounds the outside of the yokeless core 120, the water inlet 111a11 connects the water inlet loop 111a12 with the outer side wall of the upper metal plate 111, and the first upper runner 111a4 connects the water inlet loop 111a12;

the lower main runner 113a1 includes a water outlet 113a11 and a water outlet loop 113a12, the water outlet loop 113a12 surrounds the outside of the yokeless core 120, the water outlet 113a11 connects the water outlet loop 113a12 with the outer sidewall of the lower metal plate 113, and the first lower runner 113a4 connects the water outlet loop 113a12.

The inlet water loop 111a12 and the outlet water loop 113a12 are semi-circular loops with an arc of approximately 90 °. The water inlet loop 111a12 and the water outlet loop 113a12 are arranged in a staggered manner along the circumferential direction, wherein the water outlet loop 113a12 deviates from the water inlet loop 111a12 by 90 ° so that a central connecting line of the two first water inlet branches 111a41 is perpendicular to a central connecting line of the two first water outlet branches 113a 41. In this way, the cooling medium introduced by the first water inlet branch 111a41 is divided into two paths, and the path angle of each path on the stator casing 110 is 90 °, so that the cooling medium can uniformly pass through, and the cooling effect is improved.

As shown in fig. 11 to 14, the cooling medium is introduced through the water inlet 111a11, flows along the water inlet loop 111a12, flows into the first upper branch channel 111a4 connected thereto through the two first water inlet branches 111a41, then the first upper branch channel 111a4 introduces the cooling medium to the second lower branch channel 113a5 through the middle hole 112a, the second lower branch channel 113a5 introduces the cooling medium to the second upper branch channel 111a5 through the middle hole 112a, the second upper branch channel 111a5 introduces the cooling medium to the first lower branch channel 113a4 through the middle hole 112a, and finally discharges the cooling medium through the lower main channel 113a1, and the cooling channel path is designed reasonably, so that not only the heat exchange area is increased, but also the fluidity of the cooling medium is improved, and the design limitation of the cooling path is avoided, which causes part of heat not to be discharged in time or causes a large temperature gradient, which further causes an influence on the stator or a satisfactory output capability of the motor is not achieved.

Fifth embodiment

As shown in fig. 15 to 17, the axial-flux motor includes the stator cooling structure 100 of the axial-flux motor according to any one of the first to fourth embodiments, and further includes two rotors 200, and the two rotors 200 are air-gap-retained on both sides in the axial direction of the yokeless core 120.

Since the axial magnetic field motor adopts the stator cooling structure 100 of the axial magnetic field motor according to the above-described embodiment, the stator cooling structure 100 of the axial magnetic field motor according to the above-described embodiment is referred to for the beneficial effects of the axial magnetic field motor.

With continuing reference to fig. 12 and 17, the axial-flux motor further includes a rotating shaft 300 and at least one bearing 400, the rotating shaft 300 is inserted into the center of the stator housing 110, the bearing 400 is disposed between the rotating shaft 300 and the stator housing 110, the rotor 200 is fixed on the rotating shaft 300, and the rotor 200 and the stator 100 are maintained in an air gap manner.

As shown in fig. 15, the rotor 200 includes a rotor disk 210 and a plurality of magnetic steels 220, the plurality of magnetic steels 220 are circumferentially disposed on the rotor disk 210 at intervals, and the magnetic steels 220 are air-gap-retained with the yokeless core 120. After the magnetic steel 220 is disposed on the rotor disc 210, the magnetic steel 220 slightly protrudes from the surface of the rotor disc 210 to be air-gap-fitted with the iron core 130.

The rotor 200 further comprises a plurality of pressing plates 230, a pressing plate 230 is arranged between every two adjacent magnetic steels 220, the pressing plates 230 are fixed in the magnetic steel accommodating grooves through fasteners, and inclined surfaces are matched with the circumferential side surfaces of the magnetic steels 220 so as to position the magnetic steels 220 in the axial direction and the circumferential direction.

The magnetic steel 220 is formed by radially stacking a plurality of silicon steel sheets, a flow break surface is formed between every two adjacent silicon steel sheets, and the flow break surface can block an eddy current path of the magnetic steel, so that the effect of inhibiting eddy current loss is achieved.

The magnetic steel 220 is trapezoidal, the number of the magnetic steel 220 is consistent with that of the yoke-free iron cores 120, the upper trapezoidal bottom of the magnetic steel 220 is arranged inwards, and the lower trapezoidal bottom of the magnetic steel 220 is arranged outwards. That is, the widths of the silicon steel sheets 221 constituting the magnetic steel 220 are increased from inside to outside in the radial direction.

As shown in fig. 15, the number of the stators 100 is one, the number of the rotors 200 is two, and two rotors 200 are air-gap-retained on both sides in the axial direction of the stator 100, so as to form a single-stator double-rotor axial field motor. Of course, the axial magnetic field motor with a single stator and a single rotor or with double stators and a single rotor can be obtained according to different numbers.

Sixth embodiment

As shown in fig. 1 to 3, the method for manufacturing the axial-flux motor stator cooling structure is used for manufacturing the axial-flux motor stator cooling structure 100 of any one of the first to third embodiments, and the method includes the following steps:

a. providing a stator casing 110, wherein a plurality of iron core mounting holes 110a arranged at intervals in the circumferential direction are formed in the stator casing 110, the stator casing 110 comprises an upper metal plate 111, a middle partition plate 112 and a lower metal plate 113, the iron core mounting holes 110a sequentially penetrate through the upper metal plate 111, the middle partition plate 112 and the lower metal plate 113, the upper metal plate 111 is provided with an upper splicing part 1112, the upper splicing part 1112 is provided with an upper flow channel 111a, the lower metal plate 113 is provided with a lower splicing part 1132, the lower splicing part 1132 is provided with a lower flow channel 113a, and the middle partition plate 112 is provided with a plurality of middle holes 112a;

b. splicing the middle partition 112 between the upper splicing part 1112 and the lower splicing part 1132, so that the middle hole 112a communicates with the upper flow passage 111a and the lower flow passage 113a;

c. inserting a yokeless core 120 into the core mounting hole 110;

d. coils 130 are fitted around both axial sides of the yokeless core 120, and the coils 130 are held on both axial sides of the stator housing 110.

The shapes of the upper flow path 111a and the lower flow path 113a refer to the first to third embodiments, and are not described herein. The stator casing 110 is a split structure, so that the upper flow channel 111a and the lower flow channel 113a are formed by machining, and then the upper metal plate 111, the middle partition plate 112 and the lower metal plate 113 are spliced, thereby achieving manufacturability and reducing casting difficulty. Meanwhile, the cleaning of the upper flow passage 111a exposed on the upper splicing part 1112 and the lower flow passage 113a exposed on the lower splicing part 1132 are facilitated.

In the step b, the middle partition 112 is hermetically connected between the upper metal plate 111 and the lower metal plate 113 to increase the sealability. The sealing connection comprises the steps of arranging sealant, a sealing ring or welding.

Go up metal sheet 111 and go up the run-through and be provided with iron core installation department 1113, go up the run-through and be provided with iron core installation department 1133 down on the metal sheet 113, intermediate bottom runs through and is provided with iron core installation department 1123, and then in step b, iron core installation department 1113 in the iron core installation department 1123 with iron core installation department 1133 corresponds forms iron core mounting hole 110a.

After step d, the method further comprises:

a slot wedge 140 is inserted between two adjacent unyoked cores 120 so that the coil 130 abuts between the slot wedge 140 and the stator case 110.

The upper metal plate 111 is provided with an upper receiving portion 1111, the lower metal plate 113 is provided with a lower receiving portion 1131, and the upper receiving portion 1111 and the lower receiving portion 1131 in which the coil 130 is embedded are filled with a potting adhesive, so that the stator case 110, the coil 130, the yokeless core 120, and the like are fixed.

The above-mentioned embodiments are only for illustrating the technical idea and features of the present invention, and the purpose is to enable those skilled in the art to understand the content of the present invention and implement the present invention accordingly, and the scope of the present invention is not limited by the embodiments, i.e. all equivalent changes or modifications made according to the spirit of the present invention will still fall within the scope of the present invention.

Claims (10)

1. An axial field electric machine stator cooling structure (100), comprising:

the stator casing (110) comprises an upper metal plate (111), a middle partition plate (112) and a lower metal plate (113) which are spliced along the axial direction, a plurality of iron core mounting holes (110 a) which are circumferentially arranged at intervals are formed in the stator casing (110), and each iron core mounting hole sequentially penetrates through the upper metal plate (111), the middle partition plate (112) and the lower metal plate (113);

a plurality of yokes (120) installed in the core installation holes (110 a) such that both ends thereof are exposed to both sides of the stator case (110);

the coils (130) are sleeved on the yoke-free iron core (120), and the coils (130) are sleeved on two ends of the yoke-free iron core (120) exposed at two sides of the stator casing (110);

an upper runner (111 a) is arranged on the surface of the upper metal plate (111) spliced with the middle partition plate (112), a lower runner (113 a) is arranged on the surface of the lower metal plate (113) spliced with the middle partition plate (112), and a middle hole (112 a) for communicating the upper runner (111 a) with the lower runner (113 a) is arranged on the middle partition plate (112);

the upper runner (111 a) comprises an upper main runner (111 a 1) and an upper branch runner (111 a 2), the upper main runner (111 a 1) is arranged to be communicated with the upper branch runner (111 a 2) at one end and communicated with an external water channel at the other end, and the upper branch runner (111 a 2) is arranged around the yokeless core (120) and forms a runner notch (1110 a) at the inner side of the yokeless core (120);

the lower runner (113 a) comprises a lower main runner (113 a 1) and a lower sub-runner (113 a 2), the lower main runner (113 a 1) is arranged with one end communicated with the lower sub-runner (113 a 2) and the other end communicated with an external water channel, the lower sub-runner (113 a 2) is arranged around the yokeless core (120) and forms a runner notch (1110 a) at the inner side of the yokeless core (120);

the middle partition plate (112) is provided with a middle hole (112 a), and the middle hole (112 a) is communicated with the upper runner (111 a 2) and the lower runner (113 a 2) at the runner notch (1110 a) side.

2. The axial field motor stator cooling structure (100) according to claim 1, wherein the upper runner (111 a 2) communicates with the lower runner (113 a 2) through two intermediate holes (112 a) at both ends of the runner notch (1110 a), respectively, the upper main runner (111 a 1) communicating with the upper runner (111 a 2) at an outer side of the yokeless core (120); the lower main runner (113 a 1) and the lower sub-runner (113 a 2) communicate at an outer side of the yokeless core (120).

3. The axial field motor stator cooling structure (100) of claim 1, wherein the flow channel cutout (1110 a) is provided with a flow interruption slit (1110 a 1).

4. The axial field motor stator cooling structure (100) according to claim 1, wherein the upper main flow channel (111 a 1) includes a water inlet (111 a 11) and a water inlet loop (111 a 12), the water inlet loop (111 a 12) surrounds the outer side of the yokeless core (120), the water inlet (111 a 11) connects the water inlet loop (111 a 12) and the outer side wall of the upper metal plate (111), the upper sub flow channel (111 a 2) connects the water inlet loop (111 a 12);

the lower main runner (113 a 1) comprises a water outlet (113 a 11) and a water outlet loop (113 a 12), the water outlet loop (113 a 12) surrounds the outer side of the yokeless core (120), the water outlet (113 a 11) is connected with the water outlet loop (113 a 12) and the outer side wall of the lower metal plate (113), and the lower sub-runner (113 a 2) is connected with the water outlet loop (113 a 12).

5. The axial magnetic field motor stator cooling structure (100) according to claim 4, wherein the upper branch passage (111 a 2) includes a water inlet branch passage (111 a 21), a core outer ring upper branch passage (111 a 22), and an inter-core upper branch passage (111 a 23), the water inlet branch passage (111 a 21) is connected between the water inlet loop (111 a 12) and the core outer ring upper branch passage (111 a 22), both ends of the core outer ring upper branch passage (111 a 22) are respectively connected to the inter-core upper branch passage (111 a 23), the inter-core upper branch passage (111 a 23) is disposed between two adjacent yokes-free cores (120), and the flow passage notch (1110 a) is formed between the two inter-core upper branch passages (111 a 23) inside the yokes-free cores (120);

the lower runner (113 a 2) comprises a water outlet branch (113 a 21), an iron core outer ring lower branch (113 a 22) and an inter-iron-core lower branch (113 a 23), the water outlet branch (113 a 21) is connected between the water outlet loop (113 a 12) and the iron core outer ring lower branch (113 a 22), two ends of the iron core outer ring lower branch (113 a 22) are respectively connected with the inter-iron-core lower branch (113 a 23), the inter-iron-core lower branch (113 a 23) is arranged between two adjacent non-yoke iron cores (120), and a runner notch (1110 a) is formed between the two inter-iron-core lower branches (113 a 23) on the inner side of the non-yoke iron core (120).

6. The axial field motor stator cooling structure (100) according to claim 1, wherein the number of the upper runner (111 a 2) and the lower runner (113 a 2) is plural, and the upper runner (111 a 2) and the lower runner (113 a 2) are provided at intervals.

7. The axial-field motor stator cooling structure (100) according to claim 1, wherein an outer side of the upper metal plate (111) facing away from the intermediate partition plate (112) is provided with an upper accommodating portion (1111), an outer side of the lower metal plate (113) facing away from the intermediate partition plate (112) is provided with a lower accommodating portion (1131), and coils (130) located on both sides of the yokeless core (120) in the axial direction are respectively provided in the upper accommodating portion (1111) and the lower accommodating portion (1131).

8. The axial field electric machine stator cooling structure (100) of claim 1, further comprising:

the slot wedges (140) are respectively arranged on two axial sides of the yoke-free iron core (120), each slot wedge (140) is respectively inserted between two adjacent yoke-free iron cores (120), and the coil (130) abuts between the slot wedge (140) and the stator shell (110).

9. An axial field electrical machine, comprising an axial field electrical machine stator cooling structure (100) according to any of claims 1 to 8, the axial field electrical machine further comprising two rotors (200), the two rotors (200) being air-gap retained on both axial sides of the yokeless core (120).

10. The manufacturing method of the axial magnetic field motor stator cooling structure is characterized by comprising the following steps:

a. providing a stator casing (110), wherein a plurality of iron core mounting holes (110 a) are formed in the stator casing (110) at intervals in the circumferential direction, the stator casing (110) comprises an upper metal plate (111), a middle partition plate (112) and a lower metal plate (113), the iron core mounting holes (110 a) sequentially penetrate through the upper metal plate (111), the middle partition plate (112) and the lower metal plate (113), the upper metal plate (111) is provided with an upper splicing part (1112), an upper flow channel (111 a) is formed in the upper splicing part (1112), the lower metal plate (113) is provided with a lower splicing part (1132), a lower flow channel (113 a) is formed in the lower splicing part (1132), and a plurality of middle holes (112 a) are formed in the middle partition plate (112);

b. splicing the middle partition plate (112) between the upper splicing part (1112) and the lower splicing part (1132) so that the middle hole (112 a) is communicated with the upper flow passage (111 a) and the lower flow passage (113 a);

c. inserting a yokeless core (120) into the core mounting hole (110);

d. coils (130) are sleeved on two axial sides of the yoke-free iron core (120), and the coils (130) are kept on two axial sides of the stator casing (110).

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