CN218940835U

CN218940835U - Permanent magnet motor with novel cooling structure

Info

Publication number: CN218940835U
Application number: CN202222734238.XU
Authority: CN
Inventors: 李琦; 范涛; 温旭辉; 李晔; 孙承旭; 王佐梁
Original assignee: Institute of Electrical Engineering of CAS
Current assignee: Institute of Electrical Engineering of CAS
Priority date: 2022-10-17
Filing date: 2022-10-17
Publication date: 2023-04-28
Anticipated expiration: 2032-10-17

Abstract

The utility model discloses a permanent magnet motor with a novel cooling structure, which comprises a shell, a stator, a cooling pipeline, a coil winding and a rotor, wherein the shell is arranged on the shell; the stator is arranged in the shell and comprises a stator core, wherein the stator core is provided with a stator yoke part and a plurality of first stator teeth and a plurality of second stator teeth which are respectively arranged in a protruding way from the stator yoke part to the radial inner side and the radial outer side of the stator yoke part; wherein, a plurality of first stator teeth and the stator yoke are surrounded to form a plurality of inner side grooves, and a plurality of second stator teeth and the stator yoke are surrounded to form a plurality of outer side grooves; the cooling pipeline is arranged in the outer groove and is suitable for introducing cooling medium; the coil windings are respectively arranged in the inner slots; the stator is arranged around the rotor, or the rotor is arranged around the stator. The utility model improves the structure of the motor, reduces the volume of the motor, reduces the processing procedures of the shell, improves the heat radiation capability of the motor, improves the performance of the motor and can meet the requirement of high power density.

Description

Permanent magnet motor with novel cooling structure

Technical Field

The utility model relates to the technical field of permanent magnet motors, in particular to a permanent magnet motor with a novel cooling structure.

Background

Along with the popularization of high-performance electric drive systems, the permanent magnet motor is gradually applied to the fields of new energy automobiles, rail transit, electric aviation and the like, and the power density requirement on the permanent magnet motor is higher and higher. Improving motor stator heat dissipation and reducing motor losses are an effective means of increasing motor power density.

The existing motor stator cooling structure comprises a shell and a cooling pipeline, wherein the inner side of the shell is used for fixedly connecting a motor stator; the cooling pipeline is fixed on the casing through modes such as staple bolt, and the tip of cooling pipeline is used for connecting the liquid supply device, and the cooling pipeline is provided with first orifice along the line, and first orifice is used for spraying the coolant that is provided by the liquid supply device to motor stator. The stator is sprayed by the cooling medium of the cooling pipeline to realize the efficient heat dissipation of the motor stator. However, because the cooling pipeline is fixed on the shell through modes such as a hoop, the cooling pipeline is arranged between the shell and the motor stator, occupies a large space, increases the volume of the motor, and has more processing procedures.

Disclosure of Invention

The utility model mainly aims to provide a permanent magnet motor with a novel cooling structure, which aims to reduce the volume of the motor, reduce the processing procedures of a machine shell and improve the heat dissipation capacity of the motor.

To achieve the above object, the present utility model provides an electric motor comprising:

a housing;

a stator provided in the casing, the stator including a stator core having a stator yoke and a plurality of first stator teeth and a plurality of second stator teeth protruding from the stator yoke to radially inner and outer sides thereof, respectively; wherein, a plurality of first stator teeth and the stator yoke are surrounded to form a plurality of inner side grooves, and a plurality of second stator teeth and the stator yoke are surrounded to form a plurality of outer side grooves;

a cooling pipe installed in the outer groove and adapted to be introduced with a cooling medium;

a plurality of coil windings respectively arranged in the inner slots; and

and the stator is arranged around the rotor, or the rotor is arranged around the stator.

Optionally, the cooling pipeline comprises a plurality of mutually communicated sub-runners, and the sub-runners are integrally formed or assembled in a split mode.

Optionally, the cooling duct is abutted against the outer side slot of the stator core and the end portions of the coil windings, and the cooling duct covers the end portions of the stator core and the coil windings in the axial direction.

Optionally, the cooling pipeline is made of a heat conducting material.

Optionally, the cooling duct cross section has a shape of a circle, square, polygon or trapezoid, and the outer groove cross section has the same shape as the cooling duct cross section.

Optionally, the stator core includes a plurality of core modules, and two adjacent core modules are spliced and fixed.

Optionally, the first stator teeth, the second stator teeth, and the stator yoke are oriented silicon steel; the orientation direction of the first stator teeth and the second stator teeth is the tooth height direction; the stator yoke is oriented parallel to the bottom of the inner slot.

Optionally, the rotor comprises a rotor core and magnetic steel, and the magnetic steel is surface-mounted on the rotor core; or alternatively

The magnetic steel is at least partially embedded in the rotor core.

Optionally, the motor further comprises a rotating shaft, and the rotor is sleeved on the rotating shaft.

Optionally, the gap between the coil winding and the cooling duct is filled with a high thermal conductivity potting material.

In the technical scheme of the utility model, the motor comprises a shell, a stator, a cooling pipeline, a coil winding and a rotor; the stator is arranged in the shell and comprises a stator core, wherein the stator core is provided with a stator yoke part and a plurality of first stator teeth and a plurality of second stator teeth which are respectively arranged in a protruding way from the stator yoke part to the radial inner side and the radial outer side of the stator yoke part; wherein, a plurality of first stator teeth and the stator yoke are surrounded to form a plurality of inner side grooves, and a plurality of second stator teeth and the stator yoke are surrounded to form a plurality of outer side grooves; the cooling pipeline is arranged in the outer groove and is suitable for introducing cooling medium; the coil windings are respectively arranged in the inner slots; the stator is arranged around the rotor, or the rotor is arranged around the stator.

It can be appreciated that, because the cooling pipeline is installed in the outer groove of the stator core and is not arranged on the shell of the motor, the cooling pipeline of the motor is an independent component, can be manufactured by processing sectional materials, can also be manufactured by adopting a 3D printing technology and other modes, the processing procedures of the shell are reduced, the motor volume is reduced, the heat dissipation capacity of the motor is improved, and the motor performance is improved.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of an embodiment of an electrode according to the present utility model;

FIG. 2 is a schematic view of another embodiment of an electrode according to the present utility model;

fig. 3 is a schematic structural diagram of a stator according to an embodiment of the electrode of the present utility model.

Reference numerals illustrate:

10. a housing; 20. a stator; 30. a cooling pipe; 40. a coil winding; 50. a rotor; 21. a stator yoke; 22. a first stator tooth; 23. a second stator tooth; 20a, an inner side groove; 20b, an outer groove; 220. a stator tooth unit; 210. a stator yoke unit; 51. a rotor core; 52. magnetic steel; 53. a rotating shaft.

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present utility model, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present utility model, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, if the meaning of "and/or" is presented throughout this document, it is intended to include three schemes in parallel, taking "a and/or B" as an example, including a scheme, or B scheme, or a scheme where a and B meet simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

The utility model provides a permanent magnet motor with a novel cooling structure, which is applicable to the fields of new energy automobiles, rail transit, electric aviation and the like, and is not limited at this point.

Referring to fig. 1 and 2, in an embodiment of the present utility model, the motor includes a housing 10, a stator 20, a cooling duct 30, a coil winding 40, and a rotor 50; the stator 20 is arranged in the casing 10, and the stator 20 comprises a stator core, wherein the stator core comprises a stator yoke 21 and a plurality of first stator teeth 22 and a plurality of second stator teeth 23 which are respectively arranged in a protruding manner from the stator yoke 21 to the radial inner side and the radial outer side of the stator yoke; wherein, the first stator teeth 22 and the stator yoke 21 are surrounded to form a plurality of inner slots 20a, and the second stator teeth 23 and the stator yoke 21 are surrounded to form a plurality of outer slots 20b; the cooling duct 30 is installed in the outer groove 20b and adapted to be introduced with a cooling medium; the plurality of coil windings 40 are respectively provided in the plurality of inner slots 20 a; the stator 20 is disposed around the rotor 50, or the rotor 50 is disposed around the stator 20, that is, the rotor 50 may be an inner rotor or an outer rotor.

Referring mainly to fig. 2, in the present embodiment, the rotor 50 may include a rotor core 51 and a magnetic steel 52, where the magnetic steel 52 is surface-mounted on the rotor core 51, or the magnetic steel 52 is at least partially embedded in the rotor core 51, that is, the installation mode of the magnetic steel 52 may be surface-mounted, surface-embedded or embedded, which is not limited herein.

In this embodiment, the casing 10 of the motor has no cooling duct 30, and the cooling duct 30 is a separate component. The coil winding 40 may be disposed in the inner slot 20a of the stator core of the motor with reference to the conventional motor, the cooling duct 30 may be disposed in the outer slot 20b, the cooling duct 30 may cover the end of the coil winding 40 and the stator core in the axial direction, and the cooling duct 30 may be closely attached to the end of the coil winding 40 and the outer slot 20b of the stator core to enhance heat exchange effect, thereby improving heat dissipation performance.

In this embodiment, the cooling duct 30 may include a plurality of sub-channels that are mutually communicated, and the plurality of sub-channels are integrally formed or separately assembled. Of course, the cooling duct 30 may be a plurality of independent cooling pipes, which is not limited herein.

More specifically, the cooling duct 30 may be formed from a molded tube or may be printed using 3D printing techniques, but is not limited thereto.

The cross section of the cooling pipe 30 can be circular, square, polygonal or trapezoidal, and the cross section of the outer groove 20b is the same as the cross section of the cooling pipe 30, so as to improve the stability of the installation of the cooling pipe 30 and avoid the influence of the vibration of the cooling pipe 30 in the outer groove 20b on the motor operation.

The material of the cooling duct 30 may preferably be a highly thermally conductive material, such as metal, ceramic, etc., to ensure efficient heat exchange capability of the cooling duct 30. The cooling medium may be a gas or a liquid, such as cooling water, an inert gas, etc., without limitation.

The stator 20 of the motor is integrally encapsulated, and the space between the coil winding 40 and the cooling pipeline 30 is filled with the high-heat-conductivity insulating encapsulating material, so that the heat dissipation effect of the cooling pipeline 30 can be further improved.

Referring to fig. 2, in the present embodiment, the motor may further include a rotating shaft 53, and the rotor 50 is sleeved on the rotating shaft 53 to realize rotation of the rotor 50.

It can be appreciated that, since the cooling pipe 30 is installed in the outer slot 20b of the stator core and is not disposed on the casing 10 of the motor, the cooling pipe 30 of the motor is a separate component, and can be manufactured by processing a profile, or by using a 3D printing technology, etc., so that the processing procedures of the casing 10 are reduced, the cost is relatively low, the volume of the motor is reduced, the heat dissipation capability of the motor is improved, and the performance of the motor is improved.

Referring mainly to fig. 3, in an embodiment, the stator core may include a plurality of core modules, and two adjacent core modules are spliced and fixed, and each core module may include a stator tooth unit 220 and a stator yoke unit 210, where the stator tooth unit 220 is formed by a first stator tooth 22 and a second stator tooth 23 integrally formed with the first stator tooth 22. Therefore, the motor has a more compact overall structure, is favorable for motor miniaturization, and meanwhile, is convenient for unitized splicing, so that the convenience of assembly is further improved.

In this embodiment, two adjacent core modules may be connected and fixed by a mortise-tenon structure, and the stator tooth unit 220 and the stator yoke unit 210 may also be connected and fixed by a mortise-tenon structure, which is not limited herein.

The core module and the m-phase coil 40 wound thereon constitute a single motor stator module unit, and current excitation can be independently applied.

Further, referring to fig. 3, the first stator teeth 22, the second stator teeth 23, and the stator yoke 21 are oriented silicon steel; the orientation direction of the first stator teeth 22 and the second stator teeth 23 is the tooth height direction; the stator yoke 21 is oriented parallel to the bottom of the inner slot 20 a.

The utility model fully utilizes the advantages of high saturation magnetic density and low loss of the oriented silicon steel in the orientation direction, ensures that the flux flowing direction of the stator teeth and the stator yoke is consistent with the orientation direction through the arrangement of the orientation direction of the stator teeth and the stator yoke by a modularized structure, and fully utilizes the advantages of the oriented silicon steel.

The foregoing description is only of the optional embodiments of the present utility model, and is not intended to limit the scope of the utility model, and all the equivalent structural changes made by the description of the present utility model and the accompanying drawings or the direct/indirect application in other related technical fields are included in the scope of the utility model.

Claims

1. A permanent magnet motor having a novel cooling structure, comprising:

a housing;

a plurality of coil windings respectively arranged in the inner slots; and

2. The motor of claim 1, wherein the cooling duct includes a plurality of sub-runners in communication with each other, and wherein a plurality of the sub-runners are integrally formed or separately assembled.

3. The electric machine of claim 1, wherein the cooling duct is abutted against the outer slots of the stator core and the ends of the coil windings, and the cooling duct axially covers the stator core and the ends of the coil windings.

4. The motor of claim 1, wherein the cooling conduit is a thermally conductive material.

5. The electric machine of claim 1 wherein the cooling duct cross-section is circular, square, polygonal or trapezoidal in shape and the outer slot cross-section is the same shape as the cooling duct cross-section.

6. The motor of claim 1, wherein the stator core comprises a plurality of core modules, and adjacent two of the core modules are spliced and fixed.

7. The electric machine of claim 6 wherein said first stator teeth, said second stator teeth and said stator yoke are oriented silicon steel; the orientation direction of the first stator teeth and the second stator teeth is the tooth height direction; the stator yoke is oriented parallel to the bottom of the inner slot.

8. The motor of claim 1, wherein the rotor comprises a rotor core and magnetic steel, the magnetic steel being surface-mounted to the rotor core; or alternatively

The magnetic steel is at least partially embedded in the rotor core.

9. The motor of claim 8, further comprising a shaft, wherein the rotor is sleeved on the shaft.

10. The electric machine of claim 1, wherein the gap between the coil winding and the cooling duct is filled with a high thermal conductivity potting material.