CN213879471U - Permanent magnet motor for air compressor and corresponding air compressor - Google Patents
Permanent magnet motor for air compressor and corresponding air compressor Download PDFInfo
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- CN213879471U CN213879471U CN202022930172.2U CN202022930172U CN213879471U CN 213879471 U CN213879471 U CN 213879471U CN 202022930172 U CN202022930172 U CN 202022930172U CN 213879471 U CN213879471 U CN 213879471U
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- permanent magnet
- heat pipe
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- rotating shaft
- heat
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Abstract
The utility model relates to a permanent-magnet machine (100) for air compressor, this permanent-magnet machine includes at least: a housing (10); a stator (20) disposed inside the housing (10), the stator having a stator core (21) and a winding (22) wound around the stator core (21); a rotor (30) having at least one permanent magnet (31) and configured and adapted to rotate relative to the stator (20); a rotating shaft (40) which is connected to the rotor (30) in a rotationally fixed manner and which bears with at least one end against the rotor (30), wherein at least one heat pipe (50) is embedded in the rotating shaft (40). It also relates to a corresponding air compressor. The heat of the permanent magnet can be effectively conducted out.
Description
Technical Field
The utility model relates to a permanent-magnet machine for air compressor. The utility model discloses still relate to an air compressor including this kind of permanent-magnet machine.
Background
Air compressors are widely used in various fields, mainly for compressing air. In recent years, permanent magnet motors, which have advantages of high efficiency, high power density, small size, wide speed regulation range, etc., are increasingly used to drive air compressors.
However, the increase of the heat generation amount and the heat flux density inside the motor is caused due to the winding copper loss, the stator iron loss, the permanent magnet eddy current loss, and the like inside the permanent magnet motor. When the heat inside the motor cannot be timely conducted out, the heat inside the motor is accumulated, so that the temperature of the motor, especially a permanent magnet in the motor is overhigh, demagnetization of a permanent magnet material is caused, the efficiency of the motor is seriously reduced, the running safety and the service life of the motor are damaged, and even the motor is burnt out and the like.
SUMMERY OF THE UTILITY MODEL
It is therefore an object of the present invention to provide an improved permanent magnet motor for an air compressor, which can rapidly and efficiently dissipate the heat present at the permanent magnets of the permanent magnet motor and which can be configured in a simple and low-weight manner. An object of the utility model is also to provide a corresponding air compressor.
According to the utility model discloses a first aspect provides a permanent-magnet machine for air compressor, and this permanent-magnet machine includes at least: a housing; a stator disposed inside the housing; a rotor having at least one permanent magnet and configured and adapted to rotate relative to the stator; a rotating shaft, which is arranged in a rotationally fixed manner relative to the rotor and bears with at least one end against the rotor, wherein at least one heat pipe is embedded in the rotating shaft.
Compared with the prior art, according to the utility model discloses a heat that is arranged in air compressor's permanent-magnet machine can utilize the heat pipe of embedding in the rotation axis to derive the permanent magnet among the permanent-magnet machine through the phase transition at the inside working medium of heat pipe from the motor to make the permanent magnet be in the normal operating temperature scope all the time and avoid taking place the demagnetization of permanent magnet material. Therefore, the operation safety and the service life of the permanent magnet motor are obviously improved.
According to an exemplary embodiment of the present invention, the heat pipe comprises a pipe shell and a wick comprising a capillary porous material, and/or the heat pipe is divided into an evaporation section, a heat insulation section and a condensation section, the evaporation section being closer to the permanent magnet than the condensation section, the condensation section at least partially protruding the rotation axis.
According to an exemplary embodiment of the present invention, a cooling element is further provided at an end of the heat pipe facing away from the permanent magnet, the cooling element being configured as a heat dissipating fin.
According to an exemplary embodiment of the invention, the rotation shaft is configured with a through-going through-hole and the heat pipe directly abuts against the permanent magnet via this through-going through-hole.
According to an exemplary embodiment of the invention, the rotor is configured with a recess for receiving the heat pipe and the heat pipe projects into the recess.
According to an exemplary embodiment of the invention, the rotating shaft is configured with a blind hole, in which the heat pipe is arranged in such a way that one end is close to the permanent magnet.
According to an exemplary embodiment of the present invention, the permanent magnet motor has a plurality of heat pipes arranged evenly in the rotation shaft, or the permanent magnet motor has only one heat pipe arranged at the center of the rotation shaft.
According to an exemplary embodiment of the invention, the permanent magnet is laid on the rotor core, or the permanent magnet is embedded in the rotor core, or the permanent magnet is constructed in one piece.
According to an exemplary embodiment of the invention, the rotor further has a shaft sleeve, in which the permanent magnets and/or the rotary shaft are enclosed in a form-fitting and/or force-fitting manner; and/or the permanent magnet motor is also provided with a cooling air channel, and the cooling air channel is communicated with the heat pipe; and/or the heat pipe partially extends into the environment of the permanent magnet motor.
According to the utility model discloses a second aspect provides an air compressor, this air compressor include according to the utility model permanent-magnet machine.
Drawings
The principles, features and advantages of the present invention may be better understood by describing the invention in more detail below with reference to the accompanying drawings. The drawings comprise:
fig. 1 shows a schematic view of a permanent magnet motor for an air compressor according to an exemplary embodiment of the present invention;
fig. 2 shows a detailed view of a heat pipe of a permanent magnet machine according to an exemplary embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and a plurality of exemplary embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the scope of the invention.
Fig. 1 shows a schematic view of a permanent magnet motor 100 for an air compressor according to an exemplary embodiment of the present invention. Here, the air compressor is not shown for the sake of summary.
As shown in fig. 1, the permanent magnet motor 100 includes a housing 10, a stator 20 disposed inside the housing 10, and a rotor 30 enclosed in a radial inside of the stator 20 in an axial direction, wherein an air gap exists between the stator 20 and the rotor 30, and the rotor 30 is configured and adapted to rotate relative to the stator 20 upon energization.
Here, the stator 20 has a stator core 21 and a winding 22 wound around the stator core 21. The stator core 21 and the windings 22 are arranged, for example, in a silicone potting compound 23, which enhances the heat exchange capacity, i.e. transfers the heat of the windings 22 to an exemplary water jacket 24, which is in contact with the stator core 21 and is configured to dissipate the heat generated by the stator 20. Of course, other cooling means, such as fans, considered to be significant by the person skilled in the art, can also be considered. The silicone potting compound 23 can also protect the stator core 21 and the windings 22 of the stator 20 from dirt, moisture, vibrations, etc.
As shown in fig. 1, a rotor 30 having at least one permanent magnet 31 is arranged radially inside the stator 20. The permanent magnet 31 can be configured in various ways as required. For example, at least one permanent magnet 31 may be laid on the circumferential surface of a rotor core formed by stacking silicon steel sheets. Furthermore, at least one permanent magnet 31 can also be embedded in the circumferential surface of the rotor core or inside the rotor core, in which corresponding recesses are provided for receiving the permanent magnets 31 in each case. Furthermore, it is also conceivable for the permanent magnets 31 to be of one-piece design, i.e. the rotor 30 without a rotor core has permanent magnets 31 of one-piece design. Here, the permanent magnet 31 causes the rotor 30 to rotate relative to the stator 20 by interaction of the magnetic field generated by the windings 22 of the stator 20 when energized and the magnetic poles of the permanent magnet 31.
As shown in fig. 1, the rotor 30 is connected in a rotationally fixed manner to a rotary shaft 40, which rotary shaft 40 bears with at least one end against the rotor 30 or the permanent magnet 31. In this case, the rotary shaft 40 is divided, by way of example, into a first rotary shaft and a second rotary shaft, which bear against the permanent magnet 31 via the ends facing the rotor 30, wherein the first rotary shaft is closed at the ends facing away from the permanent magnet 31 by the end cap 11 of the housing 10, wherein the second rotary shaft is connected at the ends facing away from the permanent magnet 31 to a transmission mechanism, not shown, which transmits the rotary motion of the rotor 30 to the other components of the air compressor. However, it is also conceivable to provide through openings in the rotor 30, via which the first and second rotational shafts can be fastened to one another. Here, in order to guide the rotation of the rotating shaft 40 and reduce friction between the rotating shaft 40 and other components, rotating bearings 41 are also provided at the ends of the rotating shaft 40, respectively.
The rotor 30 also has, for example, a shaft sleeve 32 in which a rotor core or permanent magnet 31 of the rotor 30 is arranged. The permanent magnet 31 and the rotary shaft 40 can be inserted in the bushing in a form-locking and/or force-locking manner, thereby ensuring that the permanent magnet 31 and the rotary shaft 40 cannot rotate relative to each other and that an axial positioning of the two is possible. In addition, the bushing 32 protects the rotating shaft 40 and prevents wear between the rotating shaft and the shaft hole.
As shown in fig. 1, at least one heat pipe 50 configured to achieve heat conduction by phase change of a working medium inside the heat pipe 50 is embedded in the rotary shaft 40. The heat pipe 50 takes full advantage of the heat conduction principle and the rapid heat transfer property of the phase change medium, so that the heat of the permanent magnet 31 can be rapidly conducted out. It is to be noted here that the thermal conductivity of the heat pipe exceeds that of any known metal, so that a very high thermal conductivity can be achieved. In addition, the heat pipe 50 has an advantage of light weight. For a detailed description of the heat pipe 50, see the explanation below for fig. 2.
In the rotary shaft 40, a through-opening is formed, by way of example, through which the heat pipe 50 can be placed directly against the permanent magnet 31. This enables the heat of the permanent magnet 31 to be directly transferred to the heat pipe 50 without any hindrance.
For example, a recess for receiving the heat pipe 50 is formed in the rotor 30 or the permanent magnet 31, and the heat pipe 50 can partially protrude into the recess via a through-opening of the rotary shaft 40. Thereby, the contact area of the heat pipe 50 and the permanent magnet 30 can be increased, thereby maximizing the thermal conductivity through the heat pipe 50.
Illustratively, a blind hole is formed in the rotary shaft 40 and the heat pipe 50 is arranged in the blind hole with one end close to the permanent magnet 31. Here, although there is a part of the material of the rotation shaft between the heat pipe 50 and the permanent magnet 31, it is possible to avoid interference or collision between the heat pipe 50 and the permanent magnet 31 while satisfying sufficient thermal conductivity.
By way of example, it is also conceivable to form both through-openings and blind holes in the rotary shaft 40 and to insert the heat pipes 50 into these through-openings and blind holes, respectively, as required.
Illustratively, the permanent magnet motor 100 has a plurality of heat pipes 50, which are uniformly arranged in the rotating shaft 40. Illustratively, the permanent magnet motor 100 has only one heat pipe 50, which is arranged at the center of the rotating shaft. This makes it possible to uniformly dissipate the heat of the permanent magnet 31 and to avoid the occurrence of uneven cooling and heating in the permanent magnet 31.
Illustratively, permanent magnet electric machine 100 also has cooling air passages 60 that lead to heat pipes 50. The heat conducted away from the permanent magnet 31 by the heat pipe 50 can be removed by the cooling air via the cooling air duct 60. Here, it may be considered to use a fan to control the flow of the cooling air in the cooling air passage 60. Furthermore, it is also conceivable for the heat pipe 50 to extend partially into the environment of the permanent magnet machine 100, so that the heat conducted away from the permanent magnet 31 by the heat pipe 50 is taken away by the ambient air. To this end, the end cap 11 may be eliminated or the heat pipe 50 may extend through a corresponding groove provided in the end cap 11.
Fig. 2 shows a detailed view of the heat pipe 50 of the permanent magnet electric machine 100 according to an exemplary embodiment of the present invention.
As shown in fig. 2, heat pipe 50 illustratively consists of a tube housing 51 and a wick 52 comprising a capillary porous material. When manufacturing the heat pipe 50, after the pipe is pumped to a negative pressure, a proper amount of working medium is filled, so that the capillary porous material of the wick 52 closely attached to the inner wall of the pipe is filled with the working medium, and then the heat pipe 50 is sealed.
After the heat pipe 50 is embedded in the rotating shaft 40, heat is transferred from the permanent magnet 31 to the end of the heat pipe 50 facing the permanent magnet 31 when the permanent magnet motor 100 is operated. When the end of heat pipe 50 facing permanent magnet 31 is heated, the working medium in the capillary porous material of wick 52 in evaporation section L1 absorbs heat and evaporates, and the vapor then flows in vapor flow direction V toward the end of heat pipe 50 facing away from permanent magnet 31 under the effect of the pressure differential. The vapor releases heat in the condensation section L3, which is remote from the permanent magnet 31 compared to the evaporation section L1, and condenses into a liquid which flows back in the wick 52 in the liquid flow direction L to the evaporation section L1 by capillary action, wherein the condensation section L3 at least partially protrudes beyond the rotary shaft 40, whereby the heat released by the vapor can be dissipated. A rapid transfer of heat from the end of the heat pipe 50 facing the permanent magnet 31 to the end of the heat pipe 50 facing away from the permanent magnet 31 can be achieved in the above process. When the permanent magnet motor 100 is operated, the above process is cycled until the temperatures of both ends of the heat pipe 50 are the same.
Illustratively, an adiabatic section L2, in which heat exchange with the outside does not occur, is further provided between the evaporation section L1 and the condensation section L3 of the heat pipe 50. Here, the heat in the heat pipe 50 is prevented from being transferred to the boss 32 by the heat insulating section L2, so that the temperature of each component in contact with the boss 32 is kept stable.
A cooling element 53, which is designed as a heat sink fin in an exemplary manner, is also provided at the condensation section L3 of the heat pipe 50 or at the end facing away from the permanent magnet 31. Here, the heat radiating fins are exemplarily composed of metal and can increase a heat exchange area, thereby improving heat exchange efficiency. The respective configuration of the cooling fins, such as fin height, fin spacing, fin number, etc., can be adapted to the application. The heat of the heat pipe 50 can be rapidly discharged through the cooling member 53 configured as a heat radiation fin, so that a large temperature difference between the evaporation stage L1 and the condensation stage L3 of the heat pipe 50 is always maintained, thereby enabling the above-described phase change heat conduction process to be stably circulated and efficiently performed. Furthermore, other cooling means or combinations of different cooling means which are considered to be significant by the person skilled in the art are also conceivable.
The preceding explanations of embodiments describe the invention only within the framework of the examples described. Of course, the individual features of the embodiments can be freely combined with one another as far as technically meaningful, without departing from the framework of the invention.
Other advantages and alternative embodiments of the present invention will be apparent to those skilled in the art. Therefore, the invention in its broader aspects is not limited to the specific details, representative structures, and illustrative examples shown and described. On the contrary, various modifications and substitutions may be made by those skilled in the art without departing from the basic spirit and scope of the invention.
Claims (10)
1. A permanent magnet electric machine (100) for air compressors, characterized in that it comprises at least:
a housing (10);
a stator (20) arranged inside the housing (10);
a rotor (30) having at least one permanent magnet (31) and configured and adapted to rotate relative to the stator (20);
a rotating shaft (40) which is connected to the rotor (30) in a rotationally fixed manner and which bears with at least one end against the rotor (30),
wherein at least one heat pipe (50) is embedded in the rotating shaft (40).
2. The permanent magnet electric machine (100) of claim 1,
the heat pipe (50) comprises a tube shell (51) and a wick (52) comprising a capillary porous material; and/or
The heat pipe (50) is divided into an evaporation section (L1), a heat insulation section (L2) and a condensation section (L3), wherein the evaporation section (L1) is closer to the permanent magnet (31) than the condensation section (L3), and the condensation section (L3) at least partially protrudes beyond the rotation shaft (40).
3. The permanent magnet machine (100) of claim 1 or 2,
a cooling element (53) is also arranged at the end of the heat pipe (50) facing away from the permanent magnet (31), the cooling element (53) being designed as a cooling fin.
4. The permanent magnet machine (100) of claim 1 or 2,
the rotating shaft (40) is configured with a through-opening, via which the heat pipe (50) rests directly on the permanent magnet (31).
5. The permanent magnet electric machine (100) of claim 4,
the rotor (30) is designed with a recess for receiving the heat pipe (50), the heat pipe (50) partially protruding into the recess.
6. The permanent magnet machine (100) of claim 1 or 2,
the rotating shaft (40) is configured with a blind hole, in which the heat pipe (50) is arranged with one end close to the permanent magnet (31).
7. The permanent magnet machine (100) of claim 1 or 2,
the permanent magnet motor (100) has a plurality of heat pipes (50) uniformly arranged in the rotating shaft (40); or
The permanent magnet motor (100) has only one heat pipe (50) arranged at the center of the rotating shaft (40).
8. The permanent magnet machine (100) of claim 1 or 2,
the permanent magnet (31) is laid on the rotor iron core; or
The permanent magnets (31) are embedded in the rotor core; or,
the permanent magnet (31) is of one-piece design.
9. The permanent magnet machine (100) of claim 1 or 2,
the rotor (30) further comprises a shaft sleeve (32), in which the permanent magnet (31) and the rotating shaft (40) are adapted to be inserted in a form-fitting and/or force-fitting manner; and/or
The permanent magnet machine (100) further having a cooling air channel (60) leading to the heat pipe (50); and/or
The heat pipe (50) extends partially into the environment of the permanent magnet machine (100).
10. An air compressor, characterized in that it comprises a permanent magnet motor (100) according to any of the preceding claims.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022930172.2U CN213879471U (en) | 2020-12-07 | 2020-12-07 | Permanent magnet motor for air compressor and corresponding air compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022930172.2U CN213879471U (en) | 2020-12-07 | 2020-12-07 | Permanent magnet motor for air compressor and corresponding air compressor |
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| Publication Number | Publication Date |
|---|---|
| CN213879471U true CN213879471U (en) | 2021-08-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022930172.2U Active CN213879471U (en) | 2020-12-07 | 2020-12-07 | Permanent magnet motor for air compressor and corresponding air compressor |
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| Country | Link |
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| CN (1) | CN213879471U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20240058713A (en) * | 2022-10-26 | 2024-05-03 | 효성전기주식회사 | Brushless motor potting method for air compressor of hydrogen car with heat dissipation molding structure applied |
| KR20240058715A (en) * | 2022-10-26 | 2024-05-07 | 효성전기주식회사 | Method of manufacturing brushless motor for air compressor of hydrogen car using salt method |
-
2020
- 2020-12-07 CN CN202022930172.2U patent/CN213879471U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20240058713A (en) * | 2022-10-26 | 2024-05-03 | 효성전기주식회사 | Brushless motor potting method for air compressor of hydrogen car with heat dissipation molding structure applied |
| KR20240058715A (en) * | 2022-10-26 | 2024-05-07 | 효성전기주식회사 | Method of manufacturing brushless motor for air compressor of hydrogen car using salt method |
| KR102731337B1 (en) * | 2022-10-26 | 2024-11-18 | 효성전기주식회사 | Brushless motor potting method for air compressor of hydrogen car with heat dissipation molding structure applied |
| KR102756319B1 (en) | 2022-10-26 | 2025-01-21 | 효성전기주식회사 | Method of manufacturing brushless motor for air compressor of hydrogen car using salt method |
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