CN113597035B - Efficient uniform heating device for motor hot jacket - Google Patents
Efficient uniform heating device for motor hot jacket Download PDFInfo
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- CN113597035B CN113597035B CN202110873938.4A CN202110873938A CN113597035B CN 113597035 B CN113597035 B CN 113597035B CN 202110873938 A CN202110873938 A CN 202110873938A CN 113597035 B CN113597035 B CN 113597035B
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 64
- 230000006698 induction Effects 0.000 claims abstract description 141
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 56
- 229910052802 copper Inorganic materials 0.000 claims abstract description 56
- 239000010949 copper Substances 0.000 claims abstract description 56
- 238000004804 winding Methods 0.000 claims abstract description 10
- 238000004088 simulation Methods 0.000 claims description 23
- 230000005672 electromagnetic field Effects 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 14
- 238000004458 analytical method Methods 0.000 claims description 10
- 229910052782 aluminium Inorganic materials 0.000 claims description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 claims description 4
- 238000004422 calculation algorithm Methods 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 238000012546 transfer Methods 0.000 claims description 3
- 230000005674 electromagnetic induction Effects 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000002679 ablation Methods 0.000 description 3
- 239000000969 carrier Substances 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/36—Coil arrangements
- H05B6/44—Coil arrangements having more than one coil or coil segment
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/36—Coil arrangements
- H05B6/38—Coil arrangements specially adapted for fitting into hollow spaces of workpieces
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/36—Coil arrangements
- H05B6/40—Establishing desired heat distribution, e.g. to heat particular parts of workpieces
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Electromagnetism (AREA)
- General Induction Heating (AREA)
Abstract
The invention discloses a high-efficiency uniform heating device for a motor hot jacket, which comprises an induction coil and an alternating current power supply module, wherein the induction coil can be matched with an inner cavity of the motor hot jacket, and the alternating current power supply module is connected with the induction coil, and the induction coil is a multi-turn hollow spiral copper coil; the induction coils are wound in a grouping crosstalk mode, n coil groups connected in series are formed, the hollow spiral copper coils in each coil group are uniformly wound, the winding radiuses of the hollow spiral copper coils in the n coil groups are the same, and the longitudinal distance between every two adjacent coil groups is larger than the outer diameter of the hollow spiral copper coil; wherein n is an integer, and n is not less than 2. The invention can improve heating efficiency and heating uniformity.
Description
Technical Field
The invention belongs to the technical field of electromagnetic induction heating, and particularly relates to a high-efficiency uniform heating device for a motor hot jacket.
Background
Along with the rapid development of industrial technology, green energy conservation has become one of the directions of enterprises for improving competition, and electromagnetic induction heating is one of novel green heating processes for converting electric energy into heat energy. Moreover, the electromagnetic induction heating has the characteristics of strong universality, convenient maintenance and the like because no physical contact exists. The metal thermal sleeve around the coil belongs to a good conductor, and the alternating magnetic field generates induced current in the conductor, namely eddy current, so that atoms in the metal move randomly at a high speed, collide with each other and rub to generate heat energy, thereby playing a role in heating the metal.
The existing heating device for the motor hot jacket comprises an induction coil which can be matched with the inner cavity of the motor hot jacket and an alternating current power supply module which is connected with the induction coil, wherein the induction coil is a multi-turn hollow spiral copper coil which is uniformly distributed in an upper-lower same-width and uniform-longitudinal spacing mode. The induction coil has the main characteristics of small influence on environment, quick heating and convenient maintenance. However, as the top end of the heated motor jacket is exposed in the air, magnetic force lines generated by the induction coil form a closed loop nearby, most magnetic force lines are gathered at the upper middle part of the electrode jacket, and magnetic force lines at the lower middle part of the electrode jacket are sparse, so that the uniformity of the axial temperature distribution of the motor jacket is poor, and the problems of local over-temperature and the like exist. Particularly, when the motor with the T-shaped process groove dug at the top is heated, the ablation phenomenon is easy to occur at the T-shaped process groove because the requirement of temperature uniformity cannot be met.
Disclosure of Invention
The invention aims to provide a high-efficiency uniform heating device for motor hot jacket so as to improve heating efficiency and heating uniformity.
The invention relates to a high-efficiency uniform heating device for a motor hot jacket, which comprises an induction coil and an alternating current power supply module, wherein the induction coil can be matched with the inner cavity of the motor hot jacket, and the alternating current power supply module is connected with the induction coil, and the induction coil is a multi-turn hollow spiral copper coil; the induction coils are wound in a grouping crosstalk mode, n coil groups connected in series are formed, the hollow spiral copper coils in each coil group are uniformly wound, the winding radiuses of the hollow spiral copper coils in the n coil groups are the same, and the longitudinal distance between every two adjacent coil groups is larger than the outer diameter of the hollow spiral copper coil; wherein n is an integer, and n is not less than 2.
Preferably, an insulating layer is further arranged on the periphery of the induction coil to separate the induction coil from the motor thermal sleeve. The insulating layer can prevent potential safety hazards of electric leakage or short circuit caused by direct contact between the induction coil and the motor hot jacket.
Preferably, when the motor jacket needs to be heated, the induction coil and the insulating layer longitudinally extend into the inner cavity of the motor jacket from top to bottom, and the highest position of the induction coil is flush with the top end of the motor jacket.
Preferably, the number n of coil groups of the induction coil and the winding radius R of the hollow spiral copper coil C Height H of ith coil group Ci Turns M of hollow spiral copper coil of ith coil group Ci Height H of nth coil group Cn Turns M of hollow spiral copper coil of nth coil group Cn And longitudinal spacing l of the ith coil group from the (i+1) th coil group Ci Obtained by simulation analysis; wherein i sequentially takes all integers from 1 to n-1; the specific steps of the simulation analysis are as follows:
the first step, let n=2, and then perform the second step.
And secondly, establishing a motor hot jacket model and an induction coil model based on finite element simulation software, and then executing the third step.
Third step, setting the structural parameters R 'according to the constraint conditions 1a to 1 c' C 、H′ Ci 、H′ Cn 、l′ Ci Numerical range of (2) and step size and structural parameter R 'of the variation' s 、H′ s 、d′、l′ 0 Then performing a fourth step; wherein constraint 1a is: r 'is more than 0' C ＜R′ s Constraint 1b is:
and l' Ci > d', constraint 1c is: h'. Ci ＝M′ Ci d′+(M′ Ci -1)l′ 0 And H' Cn ＝M′ Cn d′+(M′ Cn -1)l′ 0 ，M′ Ci 、M′ Cn Is a positive integer, R' C The winding radius of the hollow spiral copper coil of the induction coil model is represented by H' Ci Representing the height, H ', of the ith coil group of the induction coil model' Cn Representing the height, l ', of the nth coil group of the induction coil model' Ci Representing the longitudinal spacing, M ', of the ith coil group from the (i+1) th coil group of the induction coil model' Ci The number of turns, M ', of the hollow spiral copper coil of the ith coil group of the induction coil pattern is represented' Cn The number of turns, R ', of the hollow spiral copper coil of the nth coil group of the induction coil pattern is represented' s Represents the inner radius, H 'of the motor thermal jacket model' s Representing the height of the inner cavity of the motor thermal jacket model, d 'representing the outer diameter of the hollow spiral copper coil in the induction coil model, l' 0 Representing the longitudinal gap, R 'between two adjacent turns of hollow helical copper coils in each coil set of the induction coil pattern' s Equal to the inner radius R of the motor jacket s ，H′ s Equal to the motor heatHeight H of inner cavity of sleeve s D ' is equal to the outer diameter d, l ' of the hollow spiral copper coil in the induction coil ' 0 Is equal to the longitudinal clearance l of two adjacent turns of hollow spiral copper coils in each coil group of the induction coil 0 。
And fourthly, setting the material of the induction coil model as copper, setting the material of the motor thermal jacket model as aluminum, setting the heat conductivity coefficient, the specific heat capacity, the density and the conductivity of the aluminum along with the change of temperature, setting the initial reference temperature, and then executing the fifth step.
Fifthly, editing the thermal property of the motor thermal jacket model, and selecting to establish connection related to temperature feedback; then, mesh subdivision is carried out on the motor shrink fit model and the induction coil model, electromagnetic field time domain simulation is selected, simulation time length is set, the electromagnetic field intensity distribution of the surface of the motor shrink fit model is calculated by adopting a finite element algorithm, electromagnetic field intensity distribution data of the surface of the motor shrink fit model is obtained, and then the sixth step is executed.
A sixth step of establishing a connection relation between an electromagnetic field simulation module and a temperature field simulation module, setting an initial temperature and heating time, importing electromagnetic field intensity distribution data of the surface of a motor thermal jacket model into simulation software of the temperature field, setting the surface of the motor thermal jacket model capable of carrying out heat transfer and heat radiation, then carrying out simulation analysis and calculation of electromagnetic-thermal coupling, updating the heating time until constraint conditions 1d are met, obtaining various induction coil structural schemes, and then executing a seventh step; wherein one induction coil structure scheme corresponds to one group of structural parameters R' C 、H′ Ci 、H′ Cn 、l′ Ci And an axial maximum temperature T of the surface of the motor thermal jacket model vmax Minimum axial temperature T vmin Maximum radial temperature T hmax Radial minimum temperature T hmin A heating time t; constraint 1d is: t (T) vmin Not less than a preset first temperature threshold value, and T hmin And (5) not less than a preset first temperature threshold.
Seventh, judging whether the induction coil structural schemes meeting the constraint conditions 1e and 1f exist in the induction coil structural schemes, if so, executing an eighth step,if not, executing a ninth step; wherein, constraint 1e is: t (T) vmax -T vmin A second temperature threshold value which is less than or equal to the preset value, and T hmax -T hmin And less than or equal to a preset second temperature threshold, wherein the constraint condition 1f is as follows: t is less than or equal to a preset first time.
Eighth, selecting a group of structural parameters R 'corresponding to any one of the induction coil structural schemes satisfying the constraint conditions 1e and 1 f' C 、H′ Ci 、H′ Cn 、l′ Ci And let R be C Equal to R 'in the set of structural parameters' C Allowing the H to Ci Equal to H 'in the set of structural parameters' Ci Allowing the H to Cn Equal to H 'in the set of structural parameters' Cn Causing said l Ci Equal to l 'in the set of structural parameters' Ci The method comprises the steps of carrying out a first treatment on the surface of the Will H Ci 、H Cn D, l 0 The formula is introduced:
calculating to obtain the M Ci And said M Cn And then ends. The induction coil structural schemes satisfying the constraint conditions 1e and 1f satisfy both heating uniformity and heating efficiency requirements, so that any one of the induction coil structural schemes can be selected.
And a ninth step of accumulating the value of n by 1 and then returning to execute the second step.
Preferably, after the induction coil structural schemes satisfying the constraint conditions 1e and 1f are obtained through the seventh step, the processes of steps S1 to S3 are performed, so that a uniform heating device with highest heating efficiency can be obtained; wherein,,
the step S1 is as follows: judging whether the induction coil structural schemes meeting the constraint conditions 1e and 1f are only one, if yes, executing the step S2, otherwise executing the step S3.
The step S2 is as follows: causing said R to C Equal to R 'in a group of structural parameters corresponding to the induction coil structural scheme' C Allowing the H to Ci Is equal to H 'in a group of structural parameters corresponding to the induction coil structural scheme' Ci Allowing the H to Cn Equal to theH 'in a group of structural parameters corresponding to the induction coil structural scheme' Cn Causing said l Ci Is equal to l 'in a group of structural parameters corresponding to the induction coil structural scheme' Ci The method comprises the steps of carrying out a first treatment on the surface of the Will H Ci 、H Cn D, l 0 The formula is introduced:
calculating to obtain the M Ci And said M Cn And then ends.
The step S3 is as follows: selecting one of the induction coil structure schemes satisfying the constraints 1e and 1f having the smallest t value (i.e., the shortest heating time) among the plurality of induction coil structure schemes, so that the R C Equal to R 'in a group of structural parameters corresponding to the induction coil structural scheme' C Allowing the H to Ci Is equal to H 'in a group of structural parameters corresponding to the induction coil structural scheme' Ci Allowing the H to Cn Is equal to H 'in a group of structural parameters corresponding to the induction coil structural scheme' Cn Causing said l Ci Is equal to l 'in a group of structural parameters corresponding to the induction coil structural scheme' Ci The method comprises the steps of carrying out a first treatment on the surface of the Will H Ci 、H Cn D, l 0 The formula is introduced:
calculating to obtain the M Ci And said M Cn And then ends.
The invention adopts the induction coils with grouping crosstalk to heat the motor jacket, and changes the distribution of magnetic force lines by changing the longitudinal distance of the coil groups, thereby reducing the axial temperature difference of the motor jacket, further effectively improving the uniformity and reliability of electromagnetic induction heating, avoiding the over-quick local temperature rise of the motor jacket, having stronger applicability to motor jackets with different sizes, being particularly suitable for motor jackets with the height being larger than the diameter, having short heating time and high heating efficiency, and simultaneously taking into consideration the performance requirements of heating efficiency and heating uniformity, and being suitable for heating places with strict requirements on heating time. The problem of the excessive temperature ablation of certain positions caused by poor heating temperature uniformity of the existing motor hot jacket is effectively solved, and the service life of the motor hot jacket can be prolonged.
Drawings
Fig. 1 is a schematic view of the structure in which an induction coil and an insulating layer are placed in a motor jacket in the present embodiment.
Fig. 2 is a schematic structural diagram of an induction coil in the present embodiment.
Fig. 3 is a front view of the induction coil in the present embodiment.
Fig. 4 is a top view of the induction coil in the present embodiment.
Detailed Description
As shown in fig. 1 to 4, the efficient and uniform heating device for a motor jacket in this embodiment includes an induction coil 1 capable of adapting to an inner cavity of the motor jacket 2, an insulating layer 3 disposed at the periphery of the induction coil 1 to separate the induction coil 1 from the motor jacket 2, and an ac power module (not shown in the drawings) connected to the induction coil 1, wherein the induction coil 1 is a multi-turn hollow spiral copper coil, and a hollow pipe of the hollow spiral copper coil is a water channel for cooling the induction coil during heating. The induction coil 1 is wound in a grouping crosstalk mode, n coil groups connected in series are formed, the hollow spiral copper coils in each coil group are uniformly wound, the winding radiuses of the hollow spiral copper coils in the n coil groups are the same, and the longitudinal distance between two adjacent coil groups is larger than the outer diameter of the hollow spiral copper coils; wherein n is an integer, and n is not less than 2. The motor thermal sleeve 2 is of a hollow cylinder structure made of aluminum materials, the top end of the motor thermal sleeve 2 is hollowed out, the bottom is provided with an opening, and a T-shaped process groove 21 (matched with a motor stator and mainly used for controlling angles of process equipment) is dug at the inner edge of the top end of the motor thermal sleeve 2. When the motor thermal sleeve 2 needs to be heated, the induction coil 1 and the insulating layer 3 longitudinally extend into the inner cavity of the motor thermal sleeve 2 from top to bottom, and the highest position of the induction coil 1 is level with the top end of the motor thermal sleeve 2; then alternating current (with the frequency of 8.5kHz and the current of 1100 amperes) is fed to the induction coil 1 through the alternating current power supply module, a variable magnetic field is generated, the motor thermal sleeve is positioned in the magnetic field, magnetic force lines cut the motor thermal sleeve, so that eddy currents are generated in the motor thermal sleeve, carriers in the motor thermal sleeve move randomly at a high speed, the carriers collide with atoms mutually and rub to generate heat energy, and the heat energy reaches the surface of the motor thermal sleeve in a heat conduction mode. Because the generated magnetic field is uniformly distributed, the surface temperature rise rate of the motor jacket is basically consistent.
In this embodiment, the outer diameter d of the hollow spiral copper coil is equal to 10mm, the inner diameter is 8mm, and the longitudinal gap l between two adjacent hollow spiral copper coils in each coil group 0 The inner radius R of the motor jacket 2 in this embodiment =2mm s Equal to 110mm, the height H of the inner cavity of the motor thermal sleeve 2 s Equal to 222mm.
In this embodiment, the structural parameters of the induction coil 1, namely the number n of coil groups of the induction coil 1, the winding radius R of the hollow spiral copper coil C Height H of ith coil group Ci Turns M of hollow spiral copper coil of ith coil group Ci Height H of nth coil group Cn Turns M of hollow spiral copper coil of nth coil group Cn And longitudinal spacing l of the ith coil group from the (i+1) th coil group Ci Obtained by simulation analysis; wherein i is all integers from 1 to n-1 in turn. The specific steps of the simulation analysis are as follows:
the first step, let n=2, and then perform the second step.
And secondly, establishing a motor hot jacket model and an induction coil model based on finite element simulation software, and then executing the third step.
Third step, setting the structural parameters R 'according to the constraint conditions 1a to 1 c' C 、H′ Ci 、H′ Cn 、l′ Ci Numerical range of (2) and step size and structural parameter R 'of the variation' s 、H′ s 、d′、l′ 0 Then performing a fourth step; wherein constraint 1a is: r 'is more than 0' C ＜R′ s Constraint 1b is:
and l' Ci > d', constraint 1c is: h'. Ci ＝M′ Ci d′+(M′ Ci -1)l′ 0 And H' Cn ＝M′ Cn d′+(M′ Cn -1)l′ 0 ，M′ Ci 、M′ Cn Is a positive integer, R' C The winding radius of the hollow spiral copper coil of the induction coil model is represented by H' Ci Representing the height, H ', of the ith coil group of the induction coil model' Cn Representing the height, l ', of the nth coil group of the induction coil model' Ci Representing the longitudinal spacing, M ', of the ith coil group from the (i+1) th coil group of the induction coil model' Ci The number of turns, M ', of the hollow spiral copper coil of the ith coil group of the induction coil pattern is represented' Cn The number of turns, R ', of the hollow spiral copper coil of the nth coil group of the induction coil pattern is represented' s Represents the inner radius, H 'of the motor thermal jacket model' s Representing the height of the inner cavity of the motor thermal jacket model, d 'representing the outer diameter of the hollow spiral copper coil in the induction coil model, l' 0 Representing the longitudinal gap, R 'between two adjacent turns of hollow helical copper coils in each coil set of the induction coil pattern' s ＝110mm，H′ s ＝222mm，d′＝10mm，l′ 0 ＝2mm。
And a fourth step of setting the material of the induction coil model as copper, setting the material of the motor thermal jacket model as aluminum, setting the heat conductivity coefficient, specific heat capacity, density and conductivity of the aluminum along with the change of temperature (namely setting a plurality of heat conductivity coefficient values, a plurality of specific heat capacity values, a plurality of density values and a plurality of conductivity values of the aluminum related to temperature), setting an initial reference temperature, and then executing a fifth step. The relationship between the heat conductivity value, the specific heat capacity value, the density value and the electric conductivity value and the temperature can be obtained by checking a data manual of the motor thermal jacket.
Fifthly, editing the thermal property of the motor thermal jacket model, and selecting to establish connection related to temperature feedback; then, mesh subdivision is carried out on the motor shrink fit model and the induction coil model, electromagnetic field time domain simulation is selected, simulation time length is set, the electromagnetic field intensity distribution of the surface of the motor shrink fit model is calculated by adopting a finite element algorithm, electromagnetic field intensity distribution data of the surface of the motor shrink fit model is obtained, and then the sixth step is executed.
A sixth step of establishing a connection relation between an electromagnetic field simulation module and a temperature field simulation module (namely, introducing a motor thermal jacket model subjected to electromagnetic field simulation calculation into temperature field simulation software), setting initial temperature and heating time, introducing electromagnetic field intensity distribution data of the surface of the motor thermal jacket model into the simulation software of the temperature field, setting the surface of the motor thermal jacket model capable of carrying out heat transfer and heat radiation, then carrying out electromagnetic-thermal coupling simulation analysis calculation, updating the heating time until constraint conditions 1d are met, obtaining various induction coil structural schemes, and then executing a seventh step; wherein one induction coil structure scheme corresponds to one group of structural parameters R' C 、H′ Ci 、H′ Cn 、l′ Ci And an axial maximum temperature T of the surface of the motor thermal jacket model vmax An axial minimum temperature T of the surface of the motor thermal jacket model vmin A radial maximum temperature T of the surface of the motor thermal jacket model hmax A radial minimum temperature Thmin of the surface of the motor thermal jacket model and a heating time t; constraint 1d is: t (T) vmin More than or equal to 160 ℃ (i.e. the preset first temperature threshold value in the embodiment is equal to 160 ℃), and T hmin ≥160℃。
A seventh step of judging whether the induction coil structural schemes meeting the constraint conditions 1e and 1f exist in the plurality of induction coil structural schemes, if so, executing an eighth step, and if not, executing a ninth step; wherein, constraint 1e is: t (T) vmax -T vmin 40 ℃ (i.e. the second temperature threshold preset in this example is equal to 40 ℃), and T hmax -T hmin And the temperature is less than or equal to 40 ℃, and the constraint condition 1f is as follows: t is less than or equal to 60s (i.e., the first time preset in this embodiment is equal to 60 s).
Eighth, selecting an induction coil structure scheme with the smallest t value (i.e. the shortest heating time) among the induction coil structure schemes satisfying the constraint conditions 1e and 1f, so as to enable R to be the smallest C Equal to R 'in a group of structural parameters corresponding to the induction coil structural scheme' C Make H Ci Is equal to H 'in a group of structural parameters corresponding to the induction coil structural scheme' Ci Make H Cn Is equal to H 'in a group of structural parameters corresponding to the induction coil structural scheme' Cn Let l Ci Is equal to l 'in a group of structural parameters corresponding to the induction coil structural scheme' Ci The method comprises the steps of carrying out a first treatment on the surface of the Will H Ci 、H Cn D, l 0 The formula is introduced:
calculating to obtain M Ci And M Cn And then ends.
And a ninth step of accumulating the value of n by 1 and then returning to execute the second step. That is, if n=2, an induction coil structure scheme satisfying the heating uniformity and heating efficiency requirements is not obtained, n=3 is sequentially made, and then the second to seventh steps are performed, if n=3, an induction coil structure scheme satisfying the heating uniformity and heating efficiency requirements is obtained, and if an induction coil structure scheme satisfying the heating uniformity and heating efficiency requirements is not obtained yet, n=4, 5, 6, and then the second to seventh steps are performed until an induction coil structure scheme satisfying the heating uniformity and heating efficiency requirements is obtained.
As a result of the above simulation analysis, the induction coil 1 in the present embodiment has 3 coil groups (i.e., n=3), and the winding radius R of the hollow spiral copper coil C Height H of the 1 st coil group equal to 95mm C1 The number of turns M of the hollow spiral copper coil of the 1 st coil group is equal to 22mm C1 Height H of 2 nd coil group equal to 2 C2 Turns M of the hollow spiral copper coil equal to 34mm of the 2 nd coil group C1 Height H of 3 rd coil group equal to 3 C3 The number of turns M of the hollow spiral copper coil of the 3 rd coil group is equal to 58mm C3 Equal to 5, the longitudinal distance l between the 1 st coil group and the 2 nd coil group C1 Equal to 36mm, longitudinal distance l between the 2 nd coil group and the 3 rd coil group C2 Equal to 58mm. Namely, in the embodiment, the induction coil 1 is of a hollow spiral copper coil structure of '2-turn-3-5-turn' grouping crosstalk type, and the induction coil 1 is wound clockwise from top to bottom. The induction coil 1 can effectively reduce the dense distribution of magnetic force lines at the top end through the arrangement of fewer top coils, and the phaseThe arrangement of more middle coils can effectively increase the magnetic field distribution in the middle of the motor thermal sleeve, so that the motor thermal sleeve is not influenced by the reduction of magnetic force lines at the top, and the area of the magnetic force lines passing through the middle is reduced; through concentrating more coil turns in the bottom, can let the confined motor hot jacket bottom produce more effective magnetic line cutting to let the vortex that flows on the whole hot jacket more even, the heat distribution that the vortex directly produced is then more even. Finally, the problems of poor uniformity of the axial temperature, local overtemperature and the like of the motor hot jacket can be well solved, and the effective area of metal can be cut by utilizing magnetic force lines to the maximum extent, so that the shortest heating time is realized, and the heating efficiency of the equipment is improved.
When the same motor is heated, the parameters of the induction coil in the embodiment and the existing induction coil which is uniformly wound at equal longitudinal intervals and is wide up and down are compared with the following table:
when the existing induction coils which are uniformly wound at equal longitudinal intervals and have the same width up and down are heated, the maximum axial temperature difference generated on the surface of the motor hot jacket is 145 ℃, the maximum radial temperature difference is 19 ℃, the time spent for heating to 160 ℃ is 108s, and when the temperature rises, the overheating ablation phenomenon occurs in the T-shaped process groove part at the top end, so that the service life of the motor hot jacket is influenced.
When the induction coils are heated by grouping crosstalk in the embodiment, the maximum axial temperature difference generated on the surface of the motor jacket is 35 ℃, the maximum radial temperature difference is 12 ℃, and the time taken for heating to 160 ℃ is 58s, so that the uniformity of the temperature distribution of the heated surface of the motor jacket is improved, the heating time is greatly shortened, the heating efficiency is improved, and the heating efficiency is very effective in solving the problems of the uniformity of the temperature distribution and the heating efficiency of the motor jacket with larger difference between the height and the diameter.
Claims (4)
1. The efficient uniform heating device for the motor hot jacket comprises an induction coil (1) which can be matched with the inner cavity of the motor hot jacket (2) and an alternating current power supply module which is connected with the induction coil (1), wherein the induction coil (1) is a multi-turn hollow spiral copper coil; the method is characterized in that: the induction coil (1) is wound in a grouping crosstalk mode, n coil groups connected in series are formed, the hollow spiral copper coils in each coil group are uniformly wound, the winding radiuses of the hollow spiral copper coils in the n coil groups are the same, and the longitudinal distance between two adjacent coil groups is larger than the outer diameter of the hollow spiral copper coils; wherein n is an integer, and n is more than or equal to 2;
the number n of coil groups of the induction coil (1) and the winding radius R of the hollow spiral copper coil C Height H of ith coil group Ci Turns M of hollow spiral copper coil of ith coil group Ci Height H of nth coil group Cn Turns M of hollow spiral copper coil of nth coil group Cn And longitudinal spacing l of the ith coil group from the (i+1) th coil group Ci Obtained by simulation analysis; wherein i sequentially takes all integers from 1 to n-1; the specific steps of the simulation analysis are as follows:
a first step of letting n=2, and then performing a second step;
establishing a motor hot jacket model and an induction coil model based on finite element simulation software, and then executing a third step;
third step, setting the structural parameters R 'according to the constraint conditions 1a to 1 c' C 、H′ Ci 、H′ Cn 、l′ Ci Numerical range of (2) and step size and structural parameter R 'of the variation' s 、H′ s 、d′、l′ 0 Then performing a fourth step; wherein constraint 1a is: r 'is more than 0' C ＜R′ s Constraint 1b is:
and l' Ci > d', constraint 1c is: h'. Ci ＝M′ Ci d′+(M′ Ci -1)l′ 0 And H' Cn ＝M′ Cn d′+(M′ Cn -1)l′ 0 ,M′ Ci 、M′ Cn Is a positive integer, R' C Hollow spiral copper coil representing induction coil modelWinding radius, H' Ci Representing the height, H ', of the ith coil group of the induction coil model' Cn Representing the height, l ', of the nth coil group of the induction coil model' Ci Representing the longitudinal spacing, M ', of the ith coil group from the (i+1) th coil group of the induction coil model' Ci The number of turns, M ', of the hollow spiral copper coil of the ith coil group of the induction coil pattern is represented' Cn The number of turns, R ', of the hollow spiral copper coil of the nth coil group of the induction coil pattern is represented' s Represents the inner radius, H 'of the motor thermal jacket model' s Representing the height of the inner cavity of the motor thermal jacket model, d 'representing the outer diameter of the hollow spiral copper coil in the induction coil model, l' 0 Representing the longitudinal gap, R 'between two adjacent turns of hollow helical copper coils in each coil set of the induction coil pattern' s Equal to the inner radius R of the motor thermal sleeve (2) s ，H′ s Is equal to the height H of the inner cavity of the motor thermal sleeve (2) s D ' is equal to the outer diameter d, l ' of the hollow spiral copper coil in the induction coil (1) ' 0 Is equal to the longitudinal clearance l of two adjacent hollow spiral copper coils in each coil group of the induction coil (1) 0 ；
Setting the material of the induction coil model as copper, setting the material of the motor thermal jacket model as aluminum, setting the heat conductivity coefficient, specific heat capacity, density and conductivity of the aluminum along with the change of temperature, setting an initial reference temperature, and executing a fifth step;
fifthly, editing the thermal property of the motor thermal jacket model, and selecting to establish connection related to temperature feedback; then, mesh subdivision is carried out on the motor shrink fit model and the induction coil model, electromagnetic field time domain simulation is selected, simulation time length is set, the electromagnetic field intensity distribution of the surface of the motor shrink fit model is calculated by adopting a finite element algorithm, electromagnetic field intensity distribution data of the surface of the motor shrink fit model is obtained, and then a sixth step is executed;
step six, establishing a connection relation between the electromagnetic field simulation module and the temperature field simulation module, setting initial temperature and heating time, importing electromagnetic field intensity distribution data of the surface of the motor thermal jacket model into simulation software of the temperature field, and setting a motor thermal jacket capable of conducting heat transfer and heat radiationThe simulation analysis and calculation of electromagnetic-thermal coupling are then carried out on the surface of the model, the heating time is updated until the constraint condition 1d is met, a plurality of induction coil structural schemes are obtained, and then a seventh step is executed; wherein one induction coil structure scheme corresponds to one group of structural parameters R' C 、H′ Ci 、H′ Cn 、l′ Ci And an axial maximum temperature T of the surface of the motor thermal jacket model vmax Minimum axial temperature T vmin Maximum radial temperature T hmax Radial minimum temperature T hmin A heating time t; constraint 1d is: t (T) vmin Not less than a preset first temperature threshold value, and T hmin The temperature is not less than a preset first temperature threshold;
a seventh step of judging whether the induction coil structural schemes meeting the constraint conditions 1e and 1f exist in the plurality of induction coil structural schemes, if so, executing an eighth step, and if not, executing a ninth step; wherein, constraint 1e is: t (T) vmax -T vmin A second temperature threshold value which is less than or equal to the preset value, and T hmax -T hmin And less than or equal to a preset second temperature threshold, wherein the constraint condition 1f is as follows: t is less than or equal to a preset first time;
eighth, selecting a group of structural parameters R 'corresponding to any one of the induction coil structural schemes satisfying the constraint conditions 1e and 1 f' C 、H′ Ci 、H′ Cn 、l′ Ci And let R be C Equal to R 'in the set of structural parameters' C Allowing the H to Ci Equal to H 'in the set of structural parameters' Ci Allowing the H to Cn Equal to H 'in the set of structural parameters' Cn Causing said l Ci Equal to l 'in the set of structural parameters' Ci The method comprises the steps of carrying out a first treatment on the surface of the Will H Ci 、H Cn D, l 0 The formula is introduced:
calculating to obtain the M Ci And said M Cn Then end;
and a ninth step of accumulating the value of n by 1 and then returning to execute the second step.
2. The efficient uniform heating apparatus for motor thermal jackets according to claim 1, wherein: the periphery of the induction coil (1) is also provided with an insulating layer (3) for separating the induction coil (1) from the motor thermal sleeve (2).
3. The efficient uniform heating apparatus for motor thermal jackets according to claim 2, wherein: when the motor thermal sleeve (2) needs to be heated, the induction coil (1) and the insulating layer (3) longitudinally extend into the inner cavity of the motor thermal sleeve (2) from top to bottom, and the highest position of the induction coil (1) is flush with the top end of the motor thermal sleeve (2).
4. A high-efficiency uniform heating apparatus for motor thermal jackets according to any one of claims 1 to 3, characterized in that: after the induction coil structural schemes meeting the constraint conditions 1e and 1f are obtained through the seventh step, the processing of the steps S1 to S3 is carried out, and the uniform heating device with the highest heating efficiency is obtained; wherein,,
the step S1 is as follows: judging whether the induction coil structural schemes meeting the constraint conditions 1e and 1f are only one, if yes, executing the step S2, otherwise, executing the step S3;
the step S2 is as follows: causing said R to C Equal to R 'in a group of structural parameters corresponding to the induction coil structural scheme' C Allowing the H to Ci Is equal to H 'in a group of structural parameters corresponding to the induction coil structural scheme' Ci Allowing the H to Cn Is equal to H 'in a group of structural parameters corresponding to the induction coil structural scheme' Cn Causing said l Ci Is equal to l 'in a group of structural parameters corresponding to the induction coil structural scheme' Ci The method comprises the steps of carrying out a first treatment on the surface of the Will H Ci 、H Cn D, l 0 The formula is introduced:
calculating to obtain the M Ci And said M Cn Then end;
the step S3 is as follows: selecting a plurality of sensing lines satisfying constraint 1e and 1fAn induction coil structure scheme with the smallest t value in the coil structure scheme, so that R is as follows C Equal to R 'in a group of structural parameters corresponding to the induction coil structural scheme' C Allowing the H to Ci Is equal to H 'in a group of structural parameters corresponding to the induction coil structural scheme' Ci Allowing the H to Cn Is equal to H 'in a group of structural parameters corresponding to the induction coil structural scheme' Cn Causing said l Ci Is equal to l 'in a group of structural parameters corresponding to the induction coil structural scheme' Ci The method comprises the steps of carrying out a first treatment on the surface of the Will H Ci 、H Cn D, l 0 The formula is introduced:
calculating to obtain the M Ci And said M Cn And then ends. />
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