CN115720017A - Heat radiation structure of permanent magnet motor - Google Patents
Heat radiation structure of permanent magnet motor Download PDFInfo
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- CN115720017A CN115720017A CN202211357093.4A CN202211357093A CN115720017A CN 115720017 A CN115720017 A CN 115720017A CN 202211357093 A CN202211357093 A CN 202211357093A CN 115720017 A CN115720017 A CN 115720017A
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Abstract
The invention discloses a heat dissipation structure of a permanent magnet motor, which comprises a motor component, wherein a casing is sleeved outside the motor component, a tapered heat dissipation air channel is arranged between the casing and the motor component, and the motor component comprises a heat dissipation fan; a liquid cooling channel is arranged outside the motor assembly; the airflow direction of the heat dissipation air channel is opposite to the liquid flow direction of the liquid cooling channel. The liquid cooling channel and the heat dissipation air duct with opposite flow directions can improve the convection effect, and when the air flow heat dissipation is increased, more heat collected by cooling liquid is carried by utilizing the air flow mobility, so that the heat conduction efficiency is further improved, and the heat dissipation effect is remarkably improved by increasing the radiation heat dissipation efficiency, the conduction heat dissipation efficiency and the convection heat dissipation efficiency.
Description
Technical Field
The invention relates to the technical field of motor manufacturing, in particular to a heat dissipation structure of a permanent magnet motor.
Background
The permanent magnet motor has the advantages of simple structure, small size, light weight, small loss, high efficiency, high power factor, wide speed regulation range and the like, and is mainly used in application scenes requiring quick response, wide speed regulation range and accurate positioning. But because the response is fast, the rotational speed demand is wide, and during operation, its inside part can produce a large amount of heats. The reason for its production of heat mainly can appear because of the loss that the electric current produced because of the resistance when passing through the winding and because the iron loss that the iron core produced when the motor normally worked, and these losses can make electric energy conversion heat energy distribute away. In addition, high-speed mechanical movements during operation also generate certain losses due to friction between the mechanical components, which losses are converted into heat that is transmitted to the motor components and the environment. Due to the structural limitation of the motor, the heat is accumulated continuously, so that the temperature inside the motor is increased gradually, and the working performance and the service life of internal parts of the motor are influenced. In addition, the increase in power density increases the thermal load on the motor, and whether the thermal load can be handled becomes an important factor for limiting the increase in power density of the motor.
At present, a common heat dissipation mode of a high-power motor is a single mode of utilizing convection heat transfer, a flow channel is generally designed in a shell, and heat generated by a stator winding is taken away through an iron core and the shell and then through water in the flow channel. Be CN 201821407247.5's a good high-power motor of radiating effect as application number, including motor body, motor frame, bolt, gas hood, cooling tube and power cord, the four corners of motor body bottom all is fixed with the motor frame, the cooling tube is installed to motor body's outer wall, and the cooling tube installs the multiunit, the through-hole has been seted up to motor body and the junction of cooling tube, opening rubber skin is installed to the inside left end of cooling tube, the mid-mounting of motor body bottom has the gas hood, the bottom intercommunication of gas hood has the solid plate shell, the internally mounted of gas hood has the fan, the motor body right-hand member is connected with the power cord.
Although above-mentioned scheme utilizes cooling tube cooperation fan to dispel the heat to motor body, this scheme radiating mode is single, is difficult to satisfy the heat dissipation demand to the higher motor of power density, and unable adaptation high power density motor realizes high-efficient heat dissipation.
Disclosure of Invention
Aiming at the problems of single heat dissipation mode and unsatisfactory heat dissipation effect of a high-power density motor in the prior art, the invention provides the heat dissipation structure of the permanent magnet motor, which obviously improves the heat dissipation effect of the high-power density motor by optimizing the heat dissipation scheme of the motor and reduces the limit of heat load on the improvement of the motor performance.
In order to achieve the purpose, the invention adopts the following technical scheme:
a heat dissipation structure of a permanent magnet motor comprises a motor component, wherein a casing is sleeved outside the motor component, a tapered heat dissipation air channel is arranged between the casing and the motor component, and the motor component comprises a heat dissipation fan; a liquid cooling channel is arranged outside the motor assembly; the airflow direction of the heat dissipation air channel is opposite to the liquid flow direction of the liquid cooling channel. The gradual shrinkage type heat dissipation air duct can promote the air current that the heat dissipation fan provided the velocity of flow to this promotes the radiating efficiency, and the liquid cooling passageway that flows to opposite has already improved the convection current effect with the heat dissipation air duct, when increasing the air current heat dissipation, utilizes the air current mobility to carry the heat that more coolants were collected, further promotes heat conduction efficiency, through increasing radiation radiating efficiency, conduction radiating efficiency, convection current radiating efficiency, thereby is showing and is promoting the radiating effect.
Furthermore, the motor assembly comprises a stator and a rotor, the rotor comprises a rotor shaft arranged transversely to the casing, and a filter layer is arranged on the end face of the tapered heat dissipation air duct. The heat dissipation fan is driven by the rotor shaft and rotates at a high speed along with the rotor, the cleanliness of air flow is guaranteed by the filter layer, and the influence of impurities on the internal operation of the motor is avoided.
Preferably, a gearbox is arranged between the rotor shaft and the heat dissipation fan, and a control module is arranged in the gearbox. The gearbox can switch gears according to instructions of the control module so as to adjust the rotating speed of the heat dissipation fan, and when the actual working load of the motor is higher than 60% of rated load, the heat dissipation fan can be switched to a high-speed gear to improve the heat dissipation efficiency; and the actual working load is lower than 60% of rated load, and the heat dissipation fan can be switched to a common speed gear to reduce energy consumption. The specific working mode of the heat dissipation fan can be designed through preset working parameters.
Preferably, the tapered heat dissipation air duct comprises a tapered air inlet, and the heat dissipation fan is arranged at the tapered air inlet; the tapered heat dissipation air duct also comprises a tapered air outlet, and the tapered air inlet and the tapered air outlet form a secondary acceleration system. The air current gets into from the formula air inlet that reduces gradually, leaves from the formula gas outlet that reduces after passing motor element, and pressure reduces the velocity of flow and increases when the air current passes through the formula air inlet that reduces gradually, and rethread formula gas outlet secondary is accelerated for whole formula heat dissipation wind channel that reduces gradually effectively promotes the air current speed of circulation, thereby increases convection current radiating effect.
Further, the minimum diameter of the tapered air inlet is larger than the outer diameter of the stator, and the maximum diameter of the tapered air outlet is equal to the inner diameter of the stator. The minimum diameter of the tapered air inlet is larger than the outer diameter of the stator, so that the stability of the air flow path outside the stator can be ensured, and the whole motor assembly is effectively radiated; and the maximum outer diameter of the tapered air outlet is equal to the inner diameter of the stator, so that the smoothness of air flow in the shell can be ensured, and the reduction of heat dissipation effect caused by the influence of interference on flow velocity is avoided.
Preferably, the liquid flow channel is arranged on the inner wall of the casing, the liquid flow channel comprises a plurality of sub-flow channels arranged along the axial direction of the motor, and the area of the liquid flow channel close to the rotor has a larger density of the sub-flow channels. The liquid flow channel is used for cooling liquid to pass through the motor component and collect heat for heat dissipation, the density of the sub flow channel close to the rotor area is higher, heat of a heat source can be collected more effectively, and therefore heat dissipation efficiency is further improved.
Preferably, the liquid flow passage is connected with a liquid cooling assembly, the liquid cooling assembly comprises an infusion pump and a liquid storage tank communicated with the liquid flow passage, and the control module is electrically connected with the infusion pump. The transfer pump carries out heat capture with the interior liquid pump of liquid reserve tank to the liquid flow way in to rethread distal end liquid reserve tank is collected, carries out coolant liquid circulation when necessary and realizes stable heat dissipation, and the liquid cooling passageway that passes the casing can effectively catch heat and radiation heat dissipation, can cooperate the heat dissipation wind channel to carry out the convection heat dissipation simultaneously.
The inner wall of the machine shell is provided with an inner rib, and the inner rib comprises an annular rib which is annularly distributed on the inner wall of the machine shell. The inner rib is used for improving the structural strength of the machine shell and increasing the contact area of the inner wall of the machine shell and the heat dissipation airflow, so that the conduction and heat dissipation effect of the machine shell is improved, and the annular rib is distributed along the circumferential direction of the inner wall of the machine shell, so that the structural hierarchy of the inner wall is obviously improved.
The inner ribs also comprise a plurality of straight ribs distributed along the axial direction of the machine shell, and the distribution density of the straight ribs on the area of the inner wall of the machine shell corresponding to the rotor is higher than that of the straight ribs on the non-rotor area. The straight ribs with different densities can effectively improve the airflow contact area near the rotor.
And a heat dissipation coating is arranged on the inner wall of the shell. The heat dissipation coating is a high convection heat transfer coefficient/high radiation heat transfer coefficient coating, so that the heat exchange efficiency can be further improved, and the conduction heat dissipation effect is improved.
Therefore, the invention has the following beneficial effects: (1) The heat dissipation effect of the high-power-density motor is obviously improved by optimizing the motor heat dissipation scheme, and the limit of heat load on the improvement of the motor performance is reduced; (2) The liquid cooling channel and the heat dissipation air channel with opposite flow directions can improve the convection effect, increase the heat dissipation of air flow, and simultaneously utilize the fluidity of the air flow to carry more heat collected by cooling liquid, further improve the heat conduction efficiency, and obviously improve the heat dissipation effect by increasing the radiation heat dissipation efficiency, the conduction heat dissipation efficiency and the convection heat dissipation efficiency; (3) The inner rib is used for improving the structural strength of the machine shell, the contact area of the inner wall of the machine shell and the heat dissipation airflow is increased, the conduction heat dissipation effect of the machine shell is improved, the annular rib is distributed along the circumferential direction of the inner wall of the machine shell, and the hierarchy of the inner wall structure is obviously improved.
Drawings
FIG. 1 is a schematic view of the present invention.
Fig. 2 is a half-sectional expanded view of the casing in embodiment 2.
In the figure: 100 a tapered heat dissipation air duct, 101 a tapered air inlet, 102 a tapered air outlet, 1 a machine shell, 2 a heat dissipation fan, 3 a liquid cooling channel, 4 a stator, 5 a rotor, 51 a rotor shaft, 52 a filter layer, 6 a gearbox, 7 a liquid storage tank, 71 an infusion pump, 8 a heat dissipation coating, 9 an annular rib and 91 a straight rib.
Detailed Description
The invention is further described with reference to the following figures and embodiments. Examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative and intended to explain the present invention and should not be construed as limiting the present invention.
Example 1
As shown in fig. 1 and 2, a heat dissipation structure of a permanent magnet motor includes a motor assembly, a casing 1 is sleeved outside the motor assembly, a tapered heat dissipation air duct 100 is arranged between the casing and the motor assembly, and the motor assembly includes a heat dissipation fan 2; a liquid cooling channel is arranged outside the motor assembly; and the airflow direction of the heat dissipation air duct is opposite to the liquid flow direction of the liquid cooling channel.
The gradual shrinkage type heat dissipation air duct can promote the air current that the heat dissipation fan provided the velocity of flow to this promotes the radiating efficiency, and the liquid cooling passageway that flows to opposite has already improved the convection current effect with the heat dissipation air duct, when increasing the air current heat dissipation, utilizes the air current mobility to carry the heat that more coolants were collected, further promotes heat conduction efficiency, through increasing radiation radiating efficiency, conduction radiating efficiency, convection current radiating efficiency, thereby is showing and is promoting the radiating effect.
The motor component comprises a stator 4 and a rotor 5, the rotor comprises a rotor shaft 51 transversely arranged on the machine shell, the heat dissipation fan is arranged at one end of the rotor shaft corresponding to the tapered air inlet 101, and a filter layer 52 is arranged on the end face of the tapered air inlet. A gearbox 6 is arranged between the rotor shaft and the heat dissipation fan, and a control module is arranged in the gearbox.
The heat dissipation fan is driven by the rotor shaft and rotates at a high speed along with the rotor, the cleanliness of air flow is guaranteed by the filter layer, and the influence of impurities on the internal operation of the motor is avoided. The gearbox can switch gears according to the instruction of the control module so as to adjust the rotating speed of the heat dissipation fan, and when the actual working load of the motor is higher than 60% of rated load, the heat dissipation fan can be switched to a high-speed gear to improve the heat dissipation efficiency; and the actual working load is lower than 60% of rated load, and the heat dissipation fan can be switched to a common speed gear to reduce energy consumption. The specific working mode of the heat dissipation fan can be designed through preset working parameters.
The tapered heat dissipation air duct comprises a tapered air inlet, and the heat dissipation fan is arranged at the tapered air inlet; the tapered heat dissipation air duct further comprises a tapered air outlet 102, and the tapered air inlet and the tapered air outlet form a secondary acceleration system. The minimum diameter of the tapered air inlet is larger than the outer diameter of the stator, and the maximum diameter of the tapered air outlet is equal to the inner diameter of the stator.
The air flow enters from the tapered air inlet and leaves from the tapered air outlet after passing through the motor assembly, the pressure of the air flow is reduced and the flow speed is increased when the air flow passes through the tapered air inlet, and then the air flow is secondarily accelerated through the tapered air outlet, so that the flowing speed of the air flow is effectively increased through the whole tapered heat dissipation air duct, and the convection heat dissipation effect is increased. The minimum diameter of the tapered air inlet is larger than the outer diameter of the stator, so that the flow path of airflow outside the stator can be ensured to be stable, and the whole motor assembly can be effectively radiated; and the maximum outer diameter of the tapered air outlet is equal to the inner diameter of the stator, so that the smoothness of air flow in the shell can be ensured, and the reduction of the heat dissipation effect caused by the influence of interference on the flow speed is avoided.
The liquid flow channel is arranged on the inner wall of the machine shell and comprises a plurality of sub-flow channels which are arranged along the axial direction of the motor, and the area of the liquid flow channel, which is close to the rotor, has larger sub-flow channel density. The liquid flow passage is connected with a liquid cooling assembly, the liquid cooling assembly comprises an infusion pump and a liquid storage tank 7 communicated with the liquid flow passage, and the control module is electrically connected with the infusion pump 71.
The liquid flow channel is used for cooling liquid to pass through the motor component and collect heat for heat dissipation, the density of the sub flow channel close to the rotor area is higher, heat of a heat source can be collected more effectively, and therefore heat dissipation efficiency is further improved. The transfer pump carries out heat capture with the interior liquid pump of liquid reserve tank to the liquid flow way in to rethread distal end liquid reserve tank is collected, carries out coolant liquid circulation when necessary and realizes stable heat dissipation, and the liquid cooling passageway that passes the casing can effectively catch heat and radiation heat dissipation, can cooperate the heat dissipation wind channel to carry out the convection heat dissipation simultaneously. And a heat dissipation coating 8 is arranged on the inner wall of the shell. The heat dissipation coating is a high convection heat transfer coefficient/high radiation heat transfer coefficient coating, so that the heat exchange efficiency can be further improved, and the conduction heat dissipation effect is improved. In the embodiment, the WJ-5076 graphene heat dissipation coating is used as a heat dissipation coating, and has the characteristics of high heat conductivity and high radiance.
In the embodiment, multiple heat exchange modes are utilized for composite heat dissipation, so that the heat dissipation capacity is improved; the tapered heat dissipation air duct increases the air flow velocity so as to improve the convection heat dissipation capacity, and the liquid cooling channel and the heat dissipation air duct have opposite flow directions so as to further improve the flow velocity difference; the liquid cooling channel is matched with airflow heat dissipation to increase the conduction heat dissipation capacity; the inner ribs on the inner wall of the shell improve the heat dissipation area so as to effectively improve the radiation heat dissipation capability; this scheme optimizes heat radiation structure under the prerequisite that does not increase the structure complexity to obtain compound heat-sinking capability, the practical application effect is very ideal.
Example 2
As shown in fig. 2, in this embodiment, the inner wall of the casing is provided with an inner rib, and the inner rib includes an annular rib 9 annularly distributed on the inner wall of the casing. The inner ribs also comprise a plurality of straight ribs 91 which are distributed along the axial direction of the machine shell, and the distribution density of the straight ribs on the area of the inner wall of the machine shell corresponding to the rotor is higher than that of the straight ribs on the area of the non-rotor.
The inner rib is used for improving the structural strength of the machine shell and increasing the contact area of the inner wall of the machine shell and the heat dissipation airflow, so that the conduction and heat dissipation effect of the machine shell is improved, and the annular rib is distributed along the circumferential direction of the inner wall of the machine shell, so that the structural hierarchy of the inner wall is obviously improved. The straight ribs with different densities can effectively improve the airflow contact area near the rotor.
In addition to the above embodiments, the technical features of the present invention may be reselected and combined to form a new embodiment within the scope of the claims of the present invention and the specification, which are all achieved without creative efforts of those skilled in the art, and thus, the embodiments of the present invention not described in detail should be regarded as specific embodiments of the present invention and are within the protection scope of the present invention.
Claims (10)
1. A heat radiation structure of a permanent magnet motor comprises a motor component, and is characterized in that a casing is sleeved outside the motor component, a tapered heat radiation air duct is arranged between the casing and the motor component, and the motor component comprises a heat radiation fan;
a liquid cooling channel is arranged outside the motor assembly;
the airflow direction of the heat dissipation air channel is opposite to the liquid flow direction of the liquid cooling channel.
2. The heat dissipation structure of a permanent magnet motor according to claim 1, wherein the motor assembly comprises a stator and a rotor, the rotor comprises a rotor shaft arranged transversely to the housing, and a filter layer is arranged on an end surface of the tapered heat dissipation air duct.
3. The heat dissipation structure of a permanent magnet motor according to claim 2, wherein a gearbox is provided between the rotor shaft and the heat dissipation fan, and a control module is provided in the gearbox.
4. The heat dissipation structure of a permanent magnet motor according to claim 1, wherein the tapered heat dissipation air duct includes a tapered air inlet, and the heat dissipation fan is disposed at the tapered air inlet; the tapered heat dissipation air duct also comprises a tapered air outlet, and the tapered air inlet and the tapered air outlet form a secondary acceleration system.
5. The heat dissipation structure of the permanent magnet motor according to claim 4, wherein a minimum diameter of the tapered air inlet is larger than an outer diameter of the stator, and a maximum diameter of the tapered air outlet is equal to an inner diameter of the stator.
6. The heat dissipation structure of a permanent magnet motor according to any one of claims 1 to 5, wherein the liquid flow channel is disposed on an inner wall of the casing, the liquid flow channel includes a plurality of sub-flow channels disposed along an axial direction of the motor, and a region of the liquid flow channel near the rotor has a greater density of the sub-flow channels.
7. The heat dissipation structure of a permanent magnet motor according to claim 6, wherein the liquid flow passage is connected to a liquid cooling module, the liquid cooling module includes an infusion pump and a liquid storage tank connected to the liquid flow passage, and the control module is electrically connected to the infusion pump.
8. The heat dissipating structure of a permanent magnet motor as claimed in any one of claims 1 to 5, wherein the inner wall of the casing is provided with inner ribs, and the inner ribs comprise annular ribs annularly distributed on the inner wall of the casing.
9. The heat dissipating structure of a permanent magnet motor according to claim 8, wherein the inner ribs further comprise a plurality of straight ribs distributed along the axial direction of the casing, and the distribution density of the straight ribs in the region of the inner wall of the casing corresponding to the rotor is higher than that in the region of the inner wall of the casing not corresponding to the rotor.
10. The heat dissipation structure of a permanent magnet motor according to claim 1, wherein a heat dissipation coating is disposed on an inner wall of the casing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211357093.4A CN115720017A (en) | 2022-11-01 | 2022-11-01 | Heat radiation structure of permanent magnet motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211357093.4A CN115720017A (en) | 2022-11-01 | 2022-11-01 | Heat radiation structure of permanent magnet motor |
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| Publication Number | Publication Date |
|---|---|
| CN115720017A true CN115720017A (en) | 2023-02-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211357093.4A Pending CN115720017A (en) | 2022-11-01 | 2022-11-01 | Heat radiation structure of permanent magnet motor |
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| Country | Link |
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| CN (1) | CN115720017A (en) |
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2022
- 2022-11-01 CN CN202211357093.4A patent/CN115720017A/en active Pending
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