Low-cost uniform heating device for motor heat jacket
阅读说明：本技术 一种电机热套的低成本均匀加热装置 (Low-cost uniform heating device for motor heat jacket ) 是由 谭若兮 叶尚斌 邓星 余小东 于 2021-07-30 设计创作，主要内容包括：本发明公开了一种电机热套的低成本均匀加热装置,包括能够与电机热套的内腔相适配的感应线圈和与感应线圈连接的交流电源模块,感应线圈为多匝空心螺旋铜线圈；感应线圈的整体形状呈凸型,感应线圈的上部的M-(C1)匝空心螺旋铜线圈均匀绕制,感应线圈的下部的M-(C2)匝空心螺旋铜线圈均匀绕制,感应线圈的上部的M-(C1)匝空心螺旋铜线圈的绕制半径R-(C1)小于感应线圈的下部的M-(C2)匝空心螺旋铜线圈的绕制半径R-(C2)。本发明能实现电机热套的均匀加热,同时降低成本。(The invention discloses a low-cost uniform heating device of a motor thermal sleeve, 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 thermal sleeve; the whole shape of the induction coil is convex, and M is arranged at the upper part of the induction coil C1 M of the lower part of the induction coil is uniformly wound C2 M of the upper part of the induction coil is uniformly wound C1 Winding radius R of turn hollow spiral copper coil C1 M smaller than the lower part of the induction coil C2 Winding radius R of turn hollow spiral copper coil C2 . The invention can realize the uniform heating of the motor hot jacket and simultaneously reduce the cost.)
1. A low-cost uniform heating device of a motor thermal sleeve comprises an induction coil (1) which can be matched with an inner cavity of a motor thermal sleeve (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 whole shape of the induction coil (1) is convex, and M is arranged at the upper part of the induction coil (1)C1M of the lower part of the induction coil (1) is formed by uniformly winding a turn hollow spiral copper coilC2M of the upper part of the induction coil (1) is formed by uniformly winding a turn hollow spiral copper coilC1Winding radius R of turn hollow spiral copper coilC1Smaller than the lower part of the induction coil (1)C2Winding radius R of turn hollow spiral copper coilC2。
2. The low-cost uniform heating device of the motor thermal jacket according to claim 1, characterized in that: and an insulating layer (3) for separating the induction coil (1) from the motor thermal sleeve (2) is further arranged on the periphery of the induction coil (1).
3. The low-cost uniform heating device of the motor thermal jacket according to claim 1 or 2, characterized in that: 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. The low-cost uniform heating device of the motor thermal jacket according to any one of claims 1 to 3, characterized in that: number of turns M of hollow spiral copper coil at upper part of induction coil (1)C1The winding radius R of the hollow spiral copper coil at the upper part of the induction coil (1)C1Height H of upper part of induction coil (1)C1The longitudinal distance l between two adjacent turns of the hollow spiral copper coil at the upper part of the induction coil (1)C1The number of turns M of the hollow spiral copper coil at the lower part of the induction coil (1)C2The winding radius R of the hollow spiral copper coil at the lower part of the induction coil (1)C2Height H of lower part of induction coil (1)C2And the longitudinal distance l between the two adjacent turns of the hollow spiral copper coil at the lower part of the induction coil (1)C2Obtained by the following method:
firstly, establishing a motor hot jacket model and an induction coil model based on finite element simulation software;
secondly, setting a structural parameter R 'according to constraint conditions 1a to 1 c'C1、R′C2、H′C1、H′C2、l′C1、l′C2Numerical range and variation step length and structural parameter R's、H′sThe numerical value of d'; wherein, the constraint condition 1a is: 0 < R'C1＜R′C2＜R′sThe constraint 1b is: h'C1+H′C2＜H′sAnd H'C1＞0、H′C2> 0, constraint 1c is:and isAnd isM′C1、M′C2Is a positive integer, R'C1Represents a winding radius R 'of the hollow spiral copper coil at the upper part of the induction coil model'C2Represents a winding radius H 'of a hollow spiral copper coil at the lower part of the induction coil model'C1Represents the height, H ', of the upper part of the induction coil model'C2Represents the height, M ', of the lower part of the induction coil model'C1M 'representing the number of turns of the hollow spiral copper coil at the upper part of the induction coil model'C2The number of turns, l 'of the hollow spiral copper coil at the lower part of the induction coil model'C1Longitudinal spacing, l ', of two adjacent turns of the hollow helical copper coil representing the upper portion of the induction coil model'C2Longitudinal spacing, R ', of two adjacent turns of hollow helical copper coil representing the lower portion of the induction coil model'sRepresents the inner radius, H ', of the motor thermal jacket model'sDenotes a cavity height of the motor heat jacket model, d ' denotes an outer diameter, R ' of the hollow spiral copper coil in the induction coil model 'sEqual to the inner radius R of the motor thermal sleeve (2)s，H′sEqual to the height H of the inner cavity of the motor thermal sleeve (2)sD' is equal to the outer diameter d of the hollow spiral copper coil in the induction coil (1);
thirdly, setting the induction coil model as copper, the motor thermal sleeve model as aluminum, the thermal conductivity coefficient, specific heat capacity, density and electric conductivity of the aluminum along with the temperature change, and setting an initial reference temperature;
fourthly, editing the thermal property of the motor thermal sleeve model, and selectively establishing connection related to temperature feedback; then, mesh subdivision is carried out on the motor thermal jacket model and the induction coil model, electromagnetic field time domain simulation is selected, simulation duration is set, and electromagnetic field intensity distribution of the surface of the motor thermal jacket model is calculated by adopting a finite element algorithm to obtain electromagnetic field intensity distribution data of the surface of the motor thermal jacket model;
fifthly, establishing a connection relation between an electromagnetic field simulation module and a temperature field simulation module, setting initial temperature and heating time, importing electromagnetic field intensity distribution data of the surface of the motor hot jacket model into simulation software of the temperature field, setting the surface of the motor hot jacket model capable of carrying out heat transfer and heat radiation, then carrying out electromagnetic-thermal coupling simulation analysis calculation, and updating the heating time until constraint conditions are met for 1d, so as to obtain various induction coil structure schemes; wherein, an induction coil structure scheme corresponds to a group of structure parameters R'C1、R′C2、H′C1、H′C2、l′C1、l′C2And an axial highest temperature T of the surface of the motor hot jacket modelvmaxAxial minimum temperature TvminRadial maximum temperature ThmaxRadial minimum temperature Thmin(ii) a Constraint 1d is: t isvminNot less than a preset first temperature threshold, and ThminThe temperature is more than or equal to a preset first temperature threshold;
sixthly, screening n induction coil structure schemes meeting constraint conditions 1e from the multiple induction coil structure schemes; wherein, the constraint condition 1e is: t isvmax-TvminNot more than a predetermined second temperature threshold, and Thmax-ThminLess than or equal to a preset second temperature threshold;
seventhly, selecting a group of structural parameters R 'corresponding to any one of the n induction coil structural schemes'C1、R′C2、H′C1、H′C2、l′C1、l′C2And making said RC1Equal to R 'in the set of structural parameters'C1Allowing said H to standC1Is equal to H 'in the set of structural parameters'C1Let l beC1Is equal to l 'in the set of structural parameters'C1Allowing said R to standC2Equal to R 'in the set of structural parameters'C2Allowing said H to standC2Is equal to H 'in the set of structural parameters'C2Let l beC2Is equal to l 'in the set of structural parameters'C2(ii) a H is to beC1、HC2、lC1、lC2And d is substituted into the formula:calculating to obtain the MC1And said MC2。
5. The low-cost uniform heating device of the motor thermal jacket according to claim 4, characterized in that: after the n induction coil structure schemes are obtained through the sixth step, the processing of the steps S1 to S2 is carried out, and the uniform heating device with the lowest cost is obtained; wherein the content of the first and second substances,
step S1 is: structural parameter R 'in n induction coil structural schemes'C1、R′C2、H′C1、H′C2、l′C1、l′C2And d' are respectively substituted into the formula:
calculating to obtain n linear quantities C 'for induction coil models'T；
Step S2 is: selecting n quantities C 'for induction coil model'TIs the set of structural parameters R 'corresponding to the minimum value in'C1、R′C2、H′C1、H′C2、l′C1、l′C2(ii) a And reacting said RC1Equal to R 'in the set of structural parameters'C1Allowing said H to standC1Is equal to H 'in the set of structural parameters'C1Let l beC1Is equal to l 'in the set of structural parameters'C1Allowing said R to standC2Equal to R 'in the set of structural parameters'C2Allowing said H to standC2Is equal to H 'in the set of structural parameters'C2Let l beC2Is equal to l 'in the set of structural parameters'C2(ii) a H is to beC1、HC2、lC1、lC2And d is substituted into the formula:calculating to obtain the MC1And stationM isC2。
Technical Field
The invention belongs to the technical field of electromagnetic induction heating, and particularly relates to a low-cost uniform heating device for a motor hot jacket.
Background
The electromagnetic induction heating principle is that medium-high frequency alternating current is introduced into an induction coil (heating coil), closed magnetic lines of force are generated around the induction coil, so that a magnetic field is generated, a motor thermal sleeve (namely a motor shell made of aluminum) is positioned in the magnetic field, the magnetic lines of force cut the motor thermal sleeve, so that eddy current is generated inside the motor thermal sleeve, the eddy current enables carriers inside the motor thermal sleeve to move irregularly at high speed, and the carriers collide and rub with atoms to generate heat energy. According to the principle of expansion with heat and contraction with cold, the electromagnetic induction heating mode is commonly adopted in the industry to heat the motor heat jacket, so that the process assembly is completed after the periphery of the motor heat jacket is heated and expands in an equivalent manner.
The heating device of the existing motor hot jacket comprises an induction coil which can be matched with an 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 equal in upper and lower width and is uniformly distributed at equal longitudinal intervals. The heating device has a good heating effect on the motor hot jacket with a small size, but when the size of the motor hot jacket is large, the heating device is influenced by electromagnetic induction skin effect and edge effect, so that the generated eddy current is unevenly distributed, and the uniform heating of the motor hot jacket is difficult to realize. The heating of the motor hot jacket is not uniform, the local temperature rise is too fast, and the ablation phenomenon is easily caused at the local position of the motor hot jacket.
Disclosure of Invention
The invention aims to provide a low-cost uniform heating device for a motor thermal sleeve, so that uniform heating of the motor thermal sleeve is realized, and meanwhile, the cost is reduced.
The invention relates to a low-cost uniform heating device of 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; the whole shape of the induction coil is convex, and M is arranged at the upper part of the induction coilC1The hollow spiral copper coil with turns is uniformly wound, and the lower part of the induction coilMC2M of the upper part of the induction coil is uniformly woundC1Winding radius R of turn hollow spiral copper coilC1M smaller than the lower part of the induction coilC2Winding radius R of turn hollow spiral copper coilC2。
Preferably, the periphery of the induction coil is further provided with an insulating layer for separating the induction coil from the motor thermal sleeve. The insulating layer can prevent the potential safety hazard of electric leakage or short circuit caused by direct contact between the induction coil and the motor hot jacket.
Preferably, when the motor thermal sleeve needs to be heated, the induction coil and the insulating layer longitudinally extend into the inner cavity of the motor thermal sleeve from top to bottom, and the highest position of the induction coil is flush with the top end of the motor thermal sleeve.
Preferably, the number of turns M of the hollow spiral copper coil of the upper portion of the induction coilC1The winding radius R of the hollow spiral copper coil at the upper part of the induction coilC1Height H of upper part of induction coilC1Longitudinal distance l between two adjacent turns of hollow spiral copper coils on upper part of induction coilC1The number of turns M of the hollow spiral copper coil at the lower part of the induction coilC2The winding radius R of the hollow spiral copper coil at the lower part of the induction coilC2Height H of lower part of induction coilC2And the longitudinal distance l between two adjacent turns of the hollow spiral copper coil at the lower part of the induction coilC2Obtained by the following method:
firstly, establishing a motor thermal sleeve model and an induction coil model based on finite element simulation software.
Secondly, setting a structural parameter R 'according to constraint conditions 1a to 1 c'C1、R′C2、H′C1、H′C2、l′C1、l′C2Numerical range and variation step length and structural parameter R's、H′sThe numerical value of d'; wherein, the constraint condition 1a is: 0 < R'C1＜R′C2＜R′sThe constraint 1b is: h'C1+H′C2＜H′sAnd H'C1＞0,H′C2> 0, constraint 1c is:and isAnd isM′C1、M′C2Is a positive integer, R'C1Represents a winding radius R 'of the hollow spiral copper coil at the upper part of the induction coil model'C2Represents a winding radius H 'of a hollow spiral copper coil at the lower part of the induction coil model'C1Represents the height, H ', of the upper part of the induction coil model'C2Represents the height, M ', of the lower part of the induction coil model'C1M 'representing the number of turns of the hollow spiral copper coil at the upper part of the induction coil model'C2The number of turns, l 'of the hollow spiral copper coil at the lower part of the induction coil model'C1Longitudinal spacing, l ', of two adjacent turns of the hollow helical copper coil representing the upper portion of the induction coil model'C2Longitudinal spacing, R ', of two adjacent turns of hollow helical copper coil representing the lower portion of the induction coil model'sRepresents the inner radius, H ', of the motor thermal jacket model'sDenotes a cavity height of the motor heat jacket model, d ' denotes an outer diameter, R ' of the hollow spiral copper coil in the induction coil model 'sEqual to the inner radius R of the motor thermal sleeves，H′sEqual to the height H of the inner cavity of the motor thermal sleevesAnd d' is equal to the outer diameter d of the hollow spiral copper coil in the induction coil.
And thirdly, setting the induction coil model as copper, the motor thermal sleeve model as aluminum, setting the thermal conductivity coefficient, specific heat capacity, density and electric conductivity of the aluminum along with the temperature change, and setting an initial reference temperature.
Fourthly, editing the thermal property of the motor thermal sleeve model, and selectively establishing connection related to temperature feedback; then, mesh generation is carried out on the motor thermal jacket model and the induction coil model, electromagnetic field time domain simulation is selected, simulation duration is set, and electromagnetic field intensity distribution on the surface of the motor thermal jacket model is calculated by adopting a finite element algorithm to obtain electromagnetic field intensity distribution data on the surface of the motor thermal jacket model.
Fifthly, establishing a connection relation between the electromagnetic field simulation module and the temperature field simulation module (namely, guiding the motor thermal sleeve model after electromagnetic field simulation calculation into temperature field simulation software), setting initial temperature and heating time, guiding electromagnetic field intensity distribution data on the surface of the motor thermal sleeve model into the temperature field simulation software, setting the surface of the motor thermal sleeve model capable of carrying out heat transfer and heat radiation, then carrying out electromagnetic-thermal coupling simulation analysis calculation, and updating the heating time until constraint conditions 1d are met, thereby obtaining various induction coil structure schemes; wherein, an induction coil structure scheme corresponds to a group of structure parameters R'C1、R′C2、H′C1、H′C2、l′C1、l′C2And an axial highest temperature T of the surface of the motor hot jacket modelvmaxAxial minimum temperature TvminRadial maximum temperature ThmaxRadial minimum temperature Thmim(ii) a Constraint 1d is: t isvminNot less than a preset first temperature threshold, and ThmimThe temperature is more than or equal to a preset first temperature threshold value.
Sixthly, screening n induction coil structure schemes meeting constraint conditions 1e from the multiple induction coil structure schemes; wherein, the constraint condition 1e is: t isvmax-TvminNot more than a predetermined second temperature threshold, and Thmax-ThminLess than or equal to a preset second temperature threshold value.
Seventhly, selecting a group of structural parameters R 'corresponding to any one of the n induction coil structural schemes'C1、R′C2、H′C1、H′C2、l′C1、l′C2And making said RC1Equal to R 'in the set of structural parameters'C1Allowing said H to standC1Is equal to H 'in the set of structural parameters'C1Let l beC1Is equal to l 'in the set of structural parameters'C1Allowing said R to standC2Equal to R 'in the set of structural parameters'C2Allowing said H to standC2Equal to in the set of structural parametersH′C2Let l beC2Is equal to l 'in the set of structural parameters'C2(ii) a H is to beC1、HC2、lC1、lC2And d is substituted into the formula:calculating to obtain the MC1And said MC2. The n induction coil structure schemes meet the requirement of heating uniformity, and the cost is reduced; therefore, any one of the induction coil structure schemes can be selected.
Preferably, after the n types of induction coil configuration schemes are obtained in the sixth step, the processes of steps S1 to S2 are performed, so that a uniform heating device with the lowest cost can be obtained; wherein the content of the first and second substances,
step S1 is: structural parameter R 'in n induction coil structural schemes'C1、R′C2、H′C1、H′C2、l′C1、l′C2And d' are respectively substituted into the formula:
calculating to obtain n linear quantities C 'for induction coil models'T。
Step S2 is: selecting n quantities C 'for induction coil model'TIs the set of structural parameters R 'corresponding to the minimum value in'C1、R′C2、H′C1、H′C2、l′C1、l′C2(ii) a And reacting said RC1Equal to R 'in the set of structural parameters'C1Allowing said H to standC1Is equal to H 'in the set of structural parameters'C1Let l beC1Is equal to l 'in the set of structural parameters'C1Allowing said R to standC2Equal to R 'in the set of structural parameters'C2Allowing said H to standC2Is equal to H 'in the set of structural parameters'C2Let l beC2Is equal to l 'in the set of structural parameters'C2(ii) a H is to beC1、HC2、lC1、lC2And dSubstitution into the formula:calculating to obtain the MC1And said MC2. The amount of wire used in the induction coil is minimized, and the cost of a low-cost uniform heating device including the induction coil is minimized.
The invention has the following effects:
(1) the induction coil which is in a convex shape as a whole is adopted to heat the motor hot jacket, the induction coil is arranged in a narrow upper part and a wide lower part, the generated magnetic lines of force are uniformly distributed, the eddy current generated by cutting the magnetic lines of force by the motor hot jacket is uniformly distributed, the uniformity of electromagnetic induction heating is effectively improved, and the applicability to the motor hot jackets of different sizes is stronger; the uniformity of the temperature of the peripheral surface of the motor hot jacket is good, the phenomenon that the local temperature rise of the motor hot jacket is too fast is avoided, the problem of over-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.
(2) Compared with the existing induction coil with the same width from top to bottom, the induction coil with the narrow top and the wide bottom reduces the material consumption of the hollow copper coil, and further reduces the cost of the heating device.
Drawings
Fig. 1 is a schematic structural diagram of the induction coil and the insulating layer placed in the thermal sleeve of the motor in the embodiment.
Fig. 2 is a schematic structural diagram of the induction coil in this embodiment.
Fig. 3 is a front view of the induction coil in the present embodiment.
Fig. 4 is a plan view of the induction coil in the present embodiment.
Detailed Description
As shown in fig. 1 to 4, the low-cost uniform heating device for the motor thermal jacket in the embodiment includes an induction coil 1 capable of adapting to an inner cavity of a motor thermal jacket 2, an insulating layer 3 disposed on the periphery of the induction coil 1 and separating the induction coil 1 from the motor thermal jacket 2, and an ac power supply module (not shown) connected to the induction coil 1, wherein the induction coil 1 has a plurality of turns (i.e., M is M)C1+MC2Turns) of hollowThe hollow pipeline of the spiral copper coil is a water channel and used for cooling the induction coil during heating. The whole shape of the induction coil 1 is convex, and M is arranged on the upper part of the induction coil 1C1M of the lower part of the induction coil 1 is formed by uniformly winding a turn hollow spiral copper coilC2M of the upper part of the induction coil 1 is formed by uniformly winding a turn hollow spiral copper coilC1Winding radius R of turn hollow spiral copper coilC1M smaller than the lower part of the induction coil 1C2Winding radius R of turn hollow spiral copper coilC2(i.e., R)C1＜RC2). 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 hollow, the bottom of the motor thermal sleeve is provided with an opening, and a T-shaped process groove 21 (matched with a motor stator and mainly used for controlling the angle of process equipment) is dug on 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 flush with the top end of the motor thermal sleeve 2; then alternating current (the frequency is 8.5kHz, the current is 1100 amperes) is introduced into the induction coil 1 through the alternating current power supply module to generate a changing magnetic field, the motor thermal sleeve is positioned in the magnetic field, magnetic lines of force cut the motor thermal sleeve, so that eddy current is generated in the motor thermal sleeve, the eddy current enables current carriers in the motor thermal sleeve to move irregularly at a high speed, the current carriers collide with atoms 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 fields are uniformly distributed, the surface temperature rise rate of the motor hot jacket is basically consistent, and transient and steady electromagnetic induction heating temperature uniform distribution is realized.
In this embodiment, the outer diameter d of the hollow spiral copper coil is equal to 10mm, the inner diameter is 8mm, and the inner radius R of the motor thermal sleeve 2 in this embodiment issEqual to 110mm, the height H of the inner cavity of the motor thermal sleeve 2sEqual to 222 mm.
The structural parameter of the induction coil 1 in this embodiment, i.e. the number of turns M of the hollow spiral copper coil at the upper part of the induction coil 1C1The winding radius R of the hollow spiral copper coil at the upper part of the induction coil 1C1Height H of upper part of induction coil 1C1Upper part of induction coil 1Longitudinal spacing l of two adjacent turns of hollow spiral copper coilC1The number of turns M of the hollow spiral copper coil at the lower part of the induction coil 1C2The winding radius R of the hollow spiral copper coil at the lower part of the induction coil 1C2Height H of lower part of induction coil 1C2And the longitudinal distance l between the two adjacent turns of the hollow spiral copper coil at the lower part of the induction coil 1C2Obtained by the following method:
firstly, establishing a motor thermal sleeve model and an induction coil model based on finite element simulation software.
Secondly, setting a structural parameter R 'according to constraint conditions 1a to 1 c'C1、R′C2、H′C1、H′C2、l′C1、l′C2Numerical range and variation step length and structural parameter R's、H′sThe numerical value of d'; wherein, the constraint condition 1a is: 0 < R'C1＜R′C2＜R′sThe constraint 1b is: h'C1+H′C2＜H′sAnd H'C1＞0、H′C2> 0, constraint 1c is:and isAnd isM′C1、M′C2Is a positive integer, R'C1Represents a winding radius R 'of the hollow spiral copper coil at the upper part of the induction coil model'C2Represents a winding radius H 'of a hollow spiral copper coil at the lower part of the induction coil model'C1Represents the height, H ', of the upper part of the induction coil model'C2Represents the height, M ', of the lower part of the induction coil model'C1M 'representing the number of turns of the hollow spiral copper coil at the upper part of the induction coil model'C2The number of turns, l 'of the hollow spiral copper coil at the lower part of the induction coil model'C1Two adjacent ones representing the upper part of the induction coil modelLongitudinal spacing of turns of hollow helical copper coil l'C2Longitudinal spacing, R ', of two adjacent turns of hollow helical copper coil representing the lower portion of the induction coil model'sRepresents the inner radius, H ', of the motor thermal jacket model'sDenotes a cavity height of the motor heat jacket model, d ' denotes an outer diameter, R ' of the hollow spiral copper coil in the induction coil model 's＝110mm，H′s＝222mm，d′＝10mm。
And thirdly, setting the material of the induction coil model as copper, the material of the motor thermal sleeve model as aluminum, setting the thermal conductivity, the specific heat capacity, the density and the electric conductivity of the aluminum along with the temperature change (namely setting a plurality of thermal conductivity values, a plurality of specific heat capacity values, a plurality of density values and a plurality of electric conductivity values of the aluminum relative to the temperature), and setting an initial reference temperature. The relationship between the thermal conductivity value, the specific heat capacity value, the density value and the electrical conductivity value and the temperature can be obtained by checking a data manual of the motor thermal sleeve.
Fourthly, editing the thermal property of the motor thermal sleeve model, and selectively establishing connection related to temperature feedback; then, mesh generation is carried out on the motor thermal jacket model and the induction coil model, electromagnetic field time domain simulation is selected, simulation duration is set, and electromagnetic field intensity distribution on the surface of the motor thermal jacket model is calculated by adopting a finite element algorithm to obtain electromagnetic field intensity distribution data on the surface of the motor thermal jacket model.
Fifthly, establishing a connection relation between the electromagnetic field simulation module and the temperature field simulation module (namely, guiding the motor thermal sleeve model after electromagnetic field simulation calculation into temperature field simulation software), setting initial temperature and heating time, guiding electromagnetic field intensity distribution data on the surface of the motor thermal sleeve model into the temperature field simulation software, setting the surface of the motor thermal sleeve model capable of carrying out heat transfer and heat radiation, then carrying out electromagnetic-thermal coupling simulation analysis calculation, and updating the heating time until constraint conditions 1d are met, thereby obtaining various induction coil structure schemes; wherein, an induction coil structure scheme corresponds to a group of structure parameters R'C1、R′C2、H′C1、H′C2、l′C1、l′C2And motor hot jacket modelAn axial maximum temperature T of the surfacevmaxOne axial lowest temperature T of the surface of the motor hot jacket modelvminA radial highest temperature T of the surface of the motor hot jacket modelhmaxA radial minimum temperature T of the surface of the motor thermal sleeve modelhmin(ii) a Constraint 1d is: t isvmin160 ℃ or more (i.e. the preset first temperature threshold is equal to 160 ℃ in the embodiment), and T ishmin≥160℃。
Sixthly, screening n induction coil structure schemes meeting constraint conditions 1e from the multiple induction coil structure schemes obtained in the fifth step; wherein, the constraint condition 1e is: t isvmax-TvminIs less than or equal to 40 ℃ (namely the preset second temperature threshold is equal to 40 ℃ in the embodiment), and Thmax-Thmin≤40℃。
Seventhly, converting the structural parameters R 'in the n induction coil structural schemes'C1、R′C2、H′C1、H′C2、l′C1、l′C2And d' are respectively substituted into the formula:
calculating to obtain n linear quantities C 'for induction coil models'T。
Eighth step, selecting n line quantities C 'for induction coil model'TIs the set of structural parameters R 'corresponding to the minimum value in'C1、R′C2、H′C1、H′C2、l′C1、l′C2(ii) a And make RC1Equal to R 'in the set of structural parameters'C1Let H stand forC1Is equal to H 'in the set of structural parameters'C1Let l beC1Is equal to l 'in the set of structural parameters'C1Let R beC2Equal to R 'in the set of structural parameters'C2Let H stand forC2Is equal to H 'in the set of structural parameters'C2Let l beC2Is equal to l 'in the set of structural parameters'C2(ii) a H is to beC1、HC2、lC1、lC2And d is substituted into the formula: calculating to obtain MC1And MC2. The amount of wire used in the induction coil is minimized, and the cost of a low-cost uniform heating device including the induction coil is minimized.
The simulation analysis described above shows that the induction coil 1 in this embodiment is a 10-turn hollow spiral copper coil, and the number of turns M of the hollow spiral copper coil on the upper portion of the induction coil 1C1Equal to 5, the winding radius R of the hollow spiral copper coil at the upper part of the induction coil 1C1Equal to 45mm, height H of the upper part of the induction coil 1C1Equal to 106mm, the longitudinal distance l between two adjacent turns of the hollow spiral copper coil at the upper part of the induction coilC1Equal to 14 mm; number of turns M of hollow spiral copper coil at lower part of induction coilC2Equal to 5, the winding radius R of the hollow spiral copper coil at the lower part of the induction coil 1C2Equal to 95mm, height H of the lower part of the induction coilC2Equal to 106mm, the longitudinal distance l between two adjacent turns of the hollow spiral copper coil at the lower part of the induction coilC2Equal to 14mm, the 5-turn hollow spiral copper coil on the upper part of the induction coil 1 and the 5-turn hollow spiral copper coil on the lower part of the induction coil 1 are wound in series clockwise.
When the same motor hot jacket is heated, the parameter pairs of the induction coil in the embodiment and the existing induction coil uniformly wound with the same width at the upper part and the lower part and the same longitudinal distance are as follows:
when the existing induction coil which is uniformly wound at the same width from top to bottom and at the same longitudinal distance is heated, the maximum axial temperature difference generated on the surface of a motor hot jacket is 145 ℃, the maximum radial temperature difference is 19 ℃, and the highest temperature is generated at the T-shaped process groove part at the top end. In the heating process, because the surface temperature distribution of the motor hot jacket is uneven, the induction coil continuously heats the motor hot jacket to raise the temperature before the lowest temperature reaches 160 ℃, so that the T-shaped process groove part of the motor hot jacket has a local over-temperature ablation phenomenon, and the service life of the motor hot jacket is influenced.
When the convex induction coil is heated in the embodiment, the maximum axial temperature difference generated on the surface of the hot sleeve of the motor is 32 ℃, the maximum radial temperature difference is 14 ℃, and the highest temperature is generated at the middle lower part, so that the sensitive part of the T-shaped process groove at the top end is prevented from being burnt due to over-temperature. In the transient heating process, magnetic fields on the surfaces of the motor thermal sleeve are uniformly distributed, the heating rate is consistent, the motor thermal sleeve is uniformly heated, the consistency of thermal deformation of a motor thermal sleeve material can be ensured to a great extent, the reliability of electromagnetic induction heating is improved, and the service life of the motor thermal sleeve is prolonged.
In the existing induction coil which is uniformly wound at equal longitudinal intervals and has the same width from top to bottom, the total wire consumption of the hollow copper coil is 6.9 meters; in the convex induction coil of the present embodiment, the total wire consumption of the hollow copper coil is 5.3 meters. The embodiment effectively reduces 23.19% of the amount of the hollow copper coils, thereby reducing the cost to a greater extent.
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