CN112910183B

CN112910183B - Axial magnetic field motor stator assembly indirect cooling structure and assembling method thereof

Info

Publication number: CN112910183B
Application number: CN202110073414.7A
Authority: CN
Inventors: 耿伟伟; 朱婷; 侯继宁; 李强
Original assignee: Nanjing University of Science and Technology
Current assignee: Nanjing University of Science and Technology
Priority date: 2021-01-20
Filing date: 2021-01-20
Publication date: 2022-03-25
Anticipated expiration: 2041-01-20
Also published as: CN112910183A

Abstract

The invention discloses an axial magnetic field motor stator assembly indirect cooling structure and an assembling method thereof, wherein the indirect cooling structure comprises a stator water-cooling shell, a heat pipe, a stator winding and a stator core, a cooling water channel is arranged in the stator water-cooling shell, two layers of cylindrical jacks are arranged on the stator water-cooling shell corresponding to the extending direction of each slot part of the stator winding, and the number of the cylindrical jacks on each layer is consistent with that of the slot parts of the stator winding; the tail end condensing section of the heat pipe is correspondingly assembled in the cylindrical jack of the stator water-cooling shell; the other end of the heat pipe penetrates through the slot part of the stator winding, and the main part of the heat pipe is consistent with the radial length of the slot part of the stator winding; the stator core is fitted in the stator winding. The invention improves the heat dissipation capability of the axial magnetic field motor, thereby ensuring the long-term operation stability of the motor and the continuous expansion of the performance; the scheme is easy to realize in process, low in cost and suitable for wide application in practice.

Description

Axial magnetic field motor stator assembly indirect cooling structure and assembling method thereof

Technical Field

The invention relates to the technical field of permanent magnet motors, in particular to an axial magnetic field motor stator assembly indirect cooling structure and an assembling method thereof.

Background

The axial magnetic field motor, that is, the disc motor, is widely used in the market due to its compact structure, small size, light weight and high torque density, but its heat dissipation problem is also followed, and it is a key point of urgent research in this industry. At present, the axial magnetic field motor mainly adopts a cooling mode of indirect water cooling mostly, and direct oil cooling is mostly adopted. For an axial magnetic field motor which is easy to generate local high temperature rise (such as a stator winding), a water channel in an indirect water cooling mode is mostly arranged at a machine shell, heat dissipation of a high-heat component cannot be directly carried out, and the heat dissipation capacity of the motor is weakened. Someone sets up the water course in the inside of stator, goes to promote radiating efficiency through shortening the distance of conducting heat, however because the characteristic of water, its potential safety hazard in the aspect of insulating is great. Direct oil cooling improves the local heat dissipation capacity compared with indirect water cooling, and is also superior to water cooling in terms of insulation, but the element area covered by direct oil cooling is wide, and the requirement on sealing is greatly improved, so that the difficulty and the cost in process manufacturing are increased.

In summary, how to design a good heat dissipation scheme for the local high temperature rise of the axial magnetic field motor has become a technical problem that needs to be solved urgently by those skilled in the art.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and aims to solve the problems of overhigh local temperature rise caused by compact structure, small volume and large power of an axial magnetic field motor. The axial magnetic field motor stator assembly indirect cooling structure and the assembling method thereof are provided, the heat dissipation capacity of the axial magnetic field motor is improved, and further the long-term operation stability and the continuous expansion of the performance of the motor are ensured. The scheme is easy to realize in process, low in cost and suitable for wide application in practice.

In order to achieve the purpose, the invention provides the following scheme: the invention provides an axial magnetic field motor stator assembly indirect cooling structure, which comprises a stator water-cooling shell, a heat pipe, a stator winding and a stator core, wherein a cooling water channel is arranged in the stator water-cooling shell, two layers of cylindrical jacks are arranged on the stator water-cooling shell corresponding to the extending direction of each slot part of the stator winding, and the number of the cylindrical jacks on each layer is consistent with that of the slot parts of the stator winding; the tail end condensation section of the heat pipe is correspondingly assembled in the cylindrical jack of the stator water-cooling shell; the other end of the heat pipe penetrates through the groove part of the stator winding and is radially parallel to the groove part, and the main part of the heat pipe is consistent with the radial length of the groove part of the stator winding; the stator core is assembled in the stator winding.

Preferably, the stator water-cooling machine shell is tightly attached to the end part of the stator winding, and the end part of the stator winding is wrapped by insulating paper.

Preferably, the axial length of the stator water-cooling machine shell and the axial length of the cooling water channel are both larger than that of the stator winding.

Preferably, the heat pipe is disposed in the middle of a slot portion of the stator winding.

Preferably, the surface of the heat pipe is coated with epoxy resin.

Preferably, the end face and the side face of the terminal condensation section of the heat pipe are positioned in the cooling water channel.

Preferably, the cooling water channel in the stator water-cooling machine shell is an annular water channel, a cooling liquid inlet and a cooling liquid outlet are formed in the annular water channel, and the annular water channel is close to the cylindrical insertion holes.

The invention also provides an assembling method of the axial magnetic field motor stator assembly indirect cooling structure, which is applied to the axial magnetic field motor stator assembly indirect cooling structure and comprises the following steps:

when the stator winding is off-line, the position of a residual gap of a stator winding slot part corresponds to the position of a cylindrical jack on the stator water-cooling shell through a ruler tool; after the stator winding is off-line, attaching the stator water-cooling machine shell and the end part of the stator winding, aligning a cylindrical jack on the stator water-cooling machine shell with a remaining gap of a stator winding groove part, clamping a heat pipe into the remaining gap in a state of being radially parallel to or inclined to the groove part, and assembling a stator iron core in the stator winding; and finally, sealing the end face of the whole stator assembly by using an epoxy resin plate so as to form a complete and sealed stator assembly indirect cooling structure.

Compared with the prior art, the invention has the following beneficial technical effects:

(1) the problem of axial magnetic field motor stator winding heat dissipation is solved, its tip winding and stator water-cooling machine shell water course closely contact, and the slot part winding passes through high-efficient heat transfer of high-conductivity part and stator water-cooling machine shell water course, has solved closed motor winding heat dissipation problem well.

(2) The heat pipes are used as main cooling media, the characteristic of high-efficiency heat transfer in the heat pipes due to phase change is fully utilized, the defect of small air heat conductivity coefficient between a winding and a stator water-cooling shell is overcome, and the heat pipes are independent from each other, so that the operation of other heat pipes cannot be influenced even if the heat pipes are damaged during individual working, and the performance of the motor is greatly influenced.

(3) The whole heat dissipation scheme has no additional structural design needing sealing, so that the reliability is high, and the maintenance is easy.

(4) Because the heat pipe has a small section, and the length can be reduced and increased at will, redundant small space in the motor can be fully utilized, the size of the motor does not need to be enlarged additionally, and the integration of the motor and other objects is facilitated.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is an overall exploded schematic view of an axial field motor stator assembly indirect cooling arrangement;

FIG. 2 is a schematic view of a stator water-cooled housing of an indirect cooling arrangement for a stator assembly of an axial field motor;

FIG. 3 is a schematic view of the heat pipe radial nesting of the axial field motor stator assembly indirect cooling structure;

FIG. 4 is a schematic view of the heat pipe axial position of the indirect cooling structure for the stator assembly of the axial field motor;

FIG. 5 is a schematic view of the overall heat dissipation of a yoked stator of an axial field motor;

in the figure: 1. a stator water-cooled housing; 2. a channel fluid; 3. a heat pipe; 4. a stator winding; 5. a stator core; 6. a cylindrical jack; 7. a stator end winding; 8. a stator slot winding; 9. a heat pipe condensation section; 10. a heat pipe evaporation section; 11. a yoke-less stator; 12. and a rotor.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention aims to overcome the defects in the prior art and aims to solve the problems of overhigh local temperature rise caused by compact structure, small volume and large power of an axial magnetic field motor. The axial magnetic field motor stator assembly indirect cooling structure is provided, the heat dissipation capacity of the axial magnetic field motor is improved, and then the stability of long-term operation of the motor and the continuous expansion in performance are guaranteed. The scheme is easy to realize in process, low in cost and suitable for wide application in practice.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

As shown in fig. 1-2, the present embodiment provides an indirect cooling structure for a stator assembly of an axial field motor, which is composed of a stator water-cooling enclosure 1, a water channel fluid 2, a heat pipe 3, a stator winding 4, a stator core 5, and the like. The stator water-cooling machine shell 1 has a certain thickness so as to be convenient for arranging an internal cooling water channel. The stator water-cooling machine shell 1 is provided with cylindrical jacks 6 along the extending direction of each groove of the stator winding 4, so that the tail ends of the heat pipes 3, namely the heat pipe condensation sections 9, can be correspondingly assembled into the cylindrical jacks 6 of the stator water-cooling machine shell 1, the number of the cylindrical jacks 6 on each layer is consistent with the number of the grooves, the total two layers are twice of the number of the grooves, and the number of the heat pipes 3 is consistent with the number of the cylindrical jacks 6. The depth of the cylindrical insertion hole 6 is directly against the inside of the cooling water channel so as to ensure short distance and low thermal resistance between the end face and the side face of the heat pipe condensation section 9 and the water channel fluid 2. The heat pipe 3 integrally penetrates through each slot part of the stator winding 4 and is radially parallel to the slot part, and meanwhile, the main part of the heat pipe 3, namely the heat pipe evaporation section 10, is consistent with the radial length of the slot part of the stator winding 4. In order to realize the close contact between the heat pipe evaporation section 10 and the stator slot winding 8, when the stator winding 4 is off-line, a gap for placing the heat pipe 3 is specially reserved in the middle of the slot, and when the slot filling rate is high, the heat pipe 3 can be properly extruded and deformed according to the plasticity of the heat pipe 3.

The stator water-cooling machine shell 1 is tightly attached to the end part of the stator winding 4, and the end part of the stator winding 4 is wrapped by insulating paper to ensure the insulation safety. The axial length of the stator water-cooling machine shell 1 is larger than that of the stator winding 4, so that a plurality of heat pipes 3 can be embedded in parallel or the positions of the heat pipes 3 can be changed in the axial direction conveniently. The heat pipe 3 is located in the middle of the groove portion in the axial direction. And passivating the surface of the heat pipe 3 and coating the surface with epoxy resin so as to reduce the abrasion of a thin-wall shell of the heat pipe 3 and prevent working medium of the heat pipe 3 from leaking. After the lower line of the stator winding 4 and the heat pipe 3 are placed, impregnating varnish is continuously poured to perform insulation and reinforcing fixation.

As a specific example, the stator water-cooling casing 1 may be provided with an annular water channel inside, the annular water channel is provided with a coolant inlet and outlet, and the annular water channel avoids the cylindrical insertion holes 6 of the heat pipes 3 while keeping a shortest distance from the cylindrical insertion holes 6.

As shown in fig. 2, the stator water-cooling casing 1 has a certain thickness, the depth of the cylindrical insertion hole 6 is directly against the inside of the stator water-cooling casing 1 and contacts with the water channel fluid 2, and the tail end of the heat pipe 3, i.e. the condensation section, is completely matched with the cylindrical insertion hole 6.

As shown in fig. 3, the stator water-cooled casing 1 is attached to the stator end winding 7. The heat pipe condensation section 9 is matched with the cylindrical jack 6 and directly abuts against the inside of the stator water-cooling machine shell 1 to be in short-distance contact with the water channel fluid 2. The heat pipe evaporator 10 is in close contact with the stator slot winding 8.

As shown in fig. 4, the heat pipe 3 is located in the middle of the groove portion in the axial direction. Through verification, the heat pipe 3 is far less effective in heat dissipation near the notch or the groove bottom in the axial direction than the heat pipe 3 in the middle of the groove portion, and the heat pipe 3 is optimal in heat dissipation in the middle of the groove portion.

Fig. 5 is a schematic view of the overall heat dissipation of the yokeless stator of the axial field motor of the present invention. The non-yoke stator 11 mainly radiates heat through the heat pipe 3 and the stator water-cooled casing 1 in the radial direction, and transfers part of the heat to the rotor 12 through an air gap in the axial direction.

The assembly method of the axial magnetic field motor stator assembly indirect structure comprises the following steps:

firstly, when the stator winding 4 is fed, the position of the residual gap in the winding groove is ensured to be consistent with the position of the cylindrical jack 6 on the stator water-cooling machine shell 1 by related gauge tools, the residual gap in the groove is slightly larger than the size of the heat pipe 3 (including after deformation), the diameter of the cylindrical jack 6 on the stator water-cooling machine shell 1 is consistent with the diameter of the heat pipe 3 (the heat pipe 3 can be extruded and deformed to be inserted into the cylindrical jack 6), after the stator winding 4 is completely wound, the stator water-cooling machine shell 1 is attached to the stator end winding 7, the cylindrical insertion hole 6 is aligned with the gap in the winding groove, then the heat pipe 3 is clamped into the groove in a radial parallel groove part state, or under the condition of allowing the length, the heat pipe 3 is inserted into the gap from the inner side of the stator winding 4 from head to tail at a certain inclination angle, and finally, and sealing the end face of the whole stator assembly by using an epoxy resin plate so as to assemble and form a complete sealed stator assembly indirect cooling structure.

The main principle of heat dissipation of the stator winding 4 of the present embodiment is described as follows:

the stator water-cooling machine shell 1 is tightly attached to the end part of the stator winding 4, the heat pipe 3 is inserted into the groove part of the stator winding 4 in parallel, the evaporation section 10 of the heat pipe is fully contacted with the groove part of the stator winding 4, and the condensation section 9 of the heat pipe is embedded into the stator water-cooling machine shell 1 and directly abuts against a cooling water channel in the machine shell. After the motor operates, a large amount of heat generated by the stator end winding 7 is directly transferred to the water channel through the machine shell, and the heat generated by the groove winding is firstly transferred to the machine shell through the heat pipe 3 and then transferred to the water channel through the machine shell. Both the ends and the slots of the stator winding 4 can be quickly and efficiently heat-dissipated.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.

The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims

1. The utility model provides an indirect cooling structure of axial field motor stator assembly which characterized in that: the cooling water channel is arranged in the stator water cooling machine shell, two layers of cylindrical jacks are arranged on the stator water cooling machine shell in the extending direction corresponding to each slot part of the stator winding, and the number of the cylindrical jacks on each layer is consistent with that of the slot parts of the stator winding; the tail end condensation section of the heat pipe is correspondingly assembled in the cylindrical jack of the stator water-cooling shell; the other end of the heat pipe penetrates through the groove part of the stator winding, and the main part of the heat pipe is consistent with the radial length of the groove part of the stator winding; the stator iron core is assembled in the stator winding;

the heat pipe is arranged in the middle of the groove part of the stator winding.

2. The indirect cooling structure of an axial field motor stator assembly according to claim 1, wherein: the stator water cooling machine shell is tightly attached to the end portion of the stator winding, and the end portion of the stator winding is wrapped by insulating paper.

3. The indirect cooling structure of an axial field motor stator assembly according to claim 1, wherein: the axial lengths of the stator water cooling machine shell and the cooling water channel are both larger than that of the stator winding.

4. The indirect cooling structure of an axial field motor stator assembly according to claim 1, wherein: and a remaining gap is arranged in the middle of the groove part of the stator winding, the heat pipe is inserted into the remaining gap, and the size of the remaining gap is larger than that of the heat pipe.

5. The indirect cooling structure of an axial field motor stator assembly according to claim 1, wherein: the surface of the heat pipe is coated with epoxy resin.

6. The indirect cooling structure of an axial field motor stator assembly according to claim 1, wherein: the end face and the side face of the tail end condensation section of the heat pipe are positioned in the cooling water channel.

7. The indirect cooling structure of an axial field motor stator assembly according to claim 1, wherein: and a cooling water channel in the stator water cooling shell adopts an annular water channel, a cooling liquid inlet and a cooling liquid outlet are formed in the annular water channel, and the annular water channel is close to the cylindrical jacks.

8. An assembling method of an axial magnetic field motor stator assembly indirect cooling structure, which is applied to the axial magnetic field motor stator assembly indirect cooling structure of any one of claims 1 to 7, and is characterized by comprising the following steps: