CN105184020A - Induction heating simulation method - Google Patents
Induction heating simulation method Download PDFInfo
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- CN105184020A CN105184020A CN201510675426.1A CN201510675426A CN105184020A CN 105184020 A CN105184020 A CN 105184020A CN 201510675426 A CN201510675426 A CN 201510675426A CN 105184020 A CN105184020 A CN 105184020A
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Abstract
The invention provides an induction heating simulation method. The induction heating simulation method comprises the following steps: according to the shape of a steel part to be heated, adopting finite element analysis software to build a finite element model for electromagnetic induction heating; solving to realize simulation of a steel part induction heating process; acquiring a simulation result; under the condition that the simulation result meets the workpiece heating requirement, solving the equivalent inductance and the equivalent resistance of an induction coil-steel part system; according to the solved equivalent inductance and equivalent resistance, determining the impedance and the compensating capacitance of an induction heating power supply. Through analog simulation of the induction heating process, theoretic guidance is provided for configuration of the induction heating power supply, so that design errors are reduced, and the design cost is lowered.
Description
Technical field
The present invention relates to induction heating field, more specifically, relate to a kind of induction heating emulation mode.
Background technology
In induction heating technique, when the diameter of workpiece, travelling speed and heating-up temperature etc. are determined, according to the result of numerical analysis, and in conjunction with the factor such as characteristic of power supply, the technological parameters such as the heating current frequency can determining to adopt when heating, the length of heater coil.In addition, the structural parameters such as the number of turn, internal diameter, copper pipe gap of heater coil determine the electric parameter of heater coil-steel part system: quality factor, inductance value, equivalent resistance.These electric parameters are important foundations of induction heating power design of electrical system and coupling, if electrical system coupling is unreasonable, cause the loaded impedance of induction heating power higher or on the low side, induction heating power can be caused not reach output rating on the one hand, the useful power of induction heating power can not be transferred to heater coil, increase the reactive loss in circuit transmission process, reduce the electrical efficiency of induction heating power; Make induction heating power running status unreasonable on the other hand, cause the power device of induction heating power low for serviceable life, failure rate is high, can not steady in a long-termly run.
And in existing induction heating power design, continue to use traditional equivalent-circuit model based on transformer theory and experimental formula always, macroscopical electric parameters such as power, impedance and power factor can only be estimated roughly, the error of calculation is larger, often need, by a large amount of test adjustment work, finally to determine structural parameters and the electric parameter of coil, thus the man power and material of at substantial, and cause the design cycle of induction heating power long, efficiency is low.
Summary of the invention
The present invention is intended to solve one of technical matters in correlation technique at least to a certain extent.For this reason, one object of the present invention is to propose a kind of induction heating emulation mode.
According to the induction heating emulation mode of the embodiment of the present invention, comprising:
Step 1: adopt finite element software to set up finite element electromagnetic induction heating process simulation model, comprise the following steps:
Step 1.1: 1/4th of delivery type carries out modeling, and described model comprises the system be made up of steel part, inductive coil and air, described steel part is inserted in described inductive coil;
Step 1.2: utilize the front processor of described finite element software self create or read in geometric model from other modeling softwares;
Step 1.3: in electromagnetic field analysis part, setting far-field region edge magnetic potential is zero, and described steel part center applies magnetic line of force parallel boundary condition, and the plane of symmetry being arranged corresponding magnetic potential is zero, driving source electric current is applied on the cross section of described inductive coil, using the incentive condition as magnetic field;
Step 1.4: the resistivity and the relative permeability that define described steel part in 20 DEG C of-1000 DEG C of temperature ranges, the resistivity of described inductive coil and relative permeability, the relative permeability of air;
Step 1.5: in temperature field analysis part, is all set to dummy cell by described inductive coil and air element, only calculates the thermal field in described steel part region, and described steel part ambient air initial temperature is set as constant; The described steel piece surface contacted with air, only calculates the radiant heat exchange of carrying out with air-grid node;
Step 1.6: the coefficient of heat conductivity, specific heat capacity, the density that define described steel part in 20 DEG C of-1000 DEG C of temperature ranges, the heat emissivity coefficient of described steel piece surface, Boltzmann's constant;
Step 1.7: the grid dividing described steel part;
Step 1.8: the coupling adopting sequential coupling method to carry out between electromagnetism-heat calculates, and first according to the temperature field of starting condition, determines the physical parameter of material, solve electromagnetic problems, so just obtain the hot production rate that electromagnetic field exports, as the thermal source input required for thermal field emulation, then carry out Temperature calculating, simultaneously according to the thermo parameters method of now described steel part, revise the physical parameter of described steel part material, then solve electromagnetic field, so circulate, until arrive the heat time of setting
Step 2: electromagnetic induction heating process simulation emulates, and comprising:
Step 2.1: keep the output frequency of induction heating power, output current and output voltage constant, simulation obtains the Temperature Distribution after the heating of described steel part;
Step 2.2: judge whether the demand meeting heating process based on described Temperature Distribution,
Step 3: to the impedance solution procedure analog simulation of described system, comprising:
Step 3.1: adopt described finite element analysis software, get described model 1/4th carry out modeling;
Step 3.2: utilize the front processor of described finite element software self create or read in geometric model from other modeling softwares;
Step 3.3: in electromagnetic field analysis part, setting far-field region edge magnetic potential is zero, and described steel part center applies magnetic line of force parallel boundary condition, and the plane of symmetry being arranged corresponding magnetic potential is zero, driving source electric current is applied on the cross section of described inductive coil, using the incentive condition as magnetic field;
Step 3.4: the resistivity and the relative permeability that define described steel part in 20 DEG C of-1000 DEG C of temperature ranges, the resistivity of described inductive coil and relative permeability, the relative permeability of air;
Step 3.5: adopt the method for magnetic field analysis to calculate, simulation obtains equivalent inductance and the equivalent resistance of described system;
Step 3.6: impedance and the building-out capacitor of determining described induction heating power according to the described equivalent inductance of described system and equivalent resistance.
According to the induction heating emulation mode of the embodiment of the present invention, according to the shape of steel part to be heated, finite element analysis software is adopted to set up the finite element model of electromagnetic induction heating, solve to realize the simulation to steel part induction heating process, obtain analog result, meet the condition of workpiece heat demand in analog result under, solve equivalent inductance and the equivalent resistance of inductive coil-steel part system, and according to the impedance of the equivalent inductance solved and equivalent resistance determination induction heating power and building-out capacitor.The program has the following advantages:
(1) by carrying out analogue simulation to induction heating process, there is provided theoretical direction based on the configuration of analog result to induction heating power, thus reduce design error, save design cost, shorten the design cycle of induction heating power simultaneously, improve design efficiency;
(2) design parameter of inductive coil can be optimized by analogue simulation at any time, make its efficiency optimization;
(3) by improving the efficiency of induction heating power, directly improving utilization rate of electrical, thus reaching the object of energy-saving and emission-reduction.
In certain embodiments, in step 1.7, the density of described grid is successively decreased to center by the surface of described steel part.
In certain embodiments, in step 2.2, if judge the demand meeting heating process, then carry out step 3; If judge the demand not meeting heating process, then, after revising described model, again carry out step 1.
In certain embodiments, in step 1.4, define resistivity and the relative permeability of described steel part in 20 DEG C of-600 DEG C of temperature ranges, the resistivity of described inductive coil and relative permeability, the relative permeability of air; In step 1.6, define coefficient of heat conductivity, specific heat capacity, the density of described steel part in 20 DEG C of-600 DEG C of temperature ranges, the heat emissivity coefficient of described steel piece surface, Boltzmann's constant; And in step 3.4, define resistivity and the relative permeability of described steel part in 20 DEG C of-600 DEG C of temperature ranges, the resistivity of described inductive coil and relative permeability, the relative permeability of air.
In certain embodiments, the shape of described inductive coil is determined according to the shape of described steel part.
In certain embodiments, the shape of described inductive coil comprises: circle spirality, ellipse spiral shape, square spirality, rectangular coil shape.
Accompanying drawing explanation
The present invention above-mentioned and/or additional aspect and advantage will become obvious and easy understand from the following description of the accompanying drawings of embodiments, wherein:
Fig. 1 is the induction heating emulation mode process flow diagram according to the embodiment of the present invention.
Fig. 2 is the induction heating model schematic based on circle spirality inductive coil-rod iron system according to the embodiment of the present invention.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.
Fig. 1 is the induction heating emulation mode process flow diagram according to the embodiment of the present invention.As shown in Figure 1, according to the shape of steel part to be heated, finite element analysis software is adopted to set up the finite element model of electromagnetic induction heating, solve to realize the simulation to steel part induction heating process, obtain analog result, meet the condition of workpiece heat demand in analog result under, solve equivalent inductance and the equivalent resistance of inductive coil-steel part system, and according to the impedance of the equivalent inductance solved and equivalent resistance determination induction heating power and building-out capacitor.
For understanding technical scheme provided by the invention better, below to justify the heating system that spirality inductive coil and rod iron are formed, specifically describe this induction heating emulation mode.It is noted that following examples are only for describing the present invention, be not used in limitation of the present invention.Those skilled in the art can use emulation mode provided by the invention, carry out analog simulation to the heating system based on any model.
Figure 2 shows that the induction heating model schematic based on circle spirality inductive coil-rod iron system according to the embodiment of the present invention.As shown in Figure 2, this model comprises the system be made up of steel part to be heated, inductive coil and air.Wherein, steel part to be heated is cylindrical steel rods 1, and inductive coil is circle spiral coil 2.
The shape of inductive coil depends on the shape of steel part to be heated.In other embodiments, when steel part to be heated is steel plate, then inductive coil can be designed as ellipse spiral shape; When steel part to be heated is square bar, then inductive coil can be designed as square spirality; When steel part to be heated is rectangle steel, then inductive coil can be designed as rectangular coil shape.Inductive coil shape does profiling process according to the shape of workpiece to be heated.
According to the induction heating emulation mode of the embodiment of the present invention, comprise the following steps.
Step 1: adopt finite element software to set up finite element electromagnetic induction heating process simulation model, specifically comprise the following steps.
Step 1.1: 1/4th of delivery type carries out modeling.As mentioned above, in the present embodiment, this model comprises the system be made up of rod iron to be heated and circle spirality inductive coil, and rod iron is inserted in inductive coil.
Step 1.2: utilize the front processor of finite element software self create or read in geometric model from other modeling softwares.
Step 1.3: in electromagnetic field analysis part, setting far-field region edge magnetic potential is zero, and rod iron center applies magnetic line of force parallel boundary condition, and the plane of symmetry being arranged corresponding magnetic potential is zero, driving source electric current is applied on the cross section of inductive coil, using the incentive condition as magnetic field.
Step 1.4: the resistivity and the relative permeability that define rod iron in 20 DEG C of-1000 DEG C of temperature ranges, the resistivity of inductive coil and relative permeability, the relative permeability of air.Wherein, for tempered material, the above-mentioned parameter in 20 DEG C of-600 DEG C of temperature ranges can be defined; For quenched materials, the above-mentioned parameter in 20 DEG C of-1000 DEG C of temperature ranges can be defined.
Step 1.5: in temperature field analysis part, is all set to dummy cell by inductive coil and air element, and only calculate the thermal field in rod iron region, rod iron ambient air initial temperature is set as constant; The rod iron surface contacted with air, only calculates the radiant heat exchange of carrying out with air-grid node.
Step 1.6: the coefficient of heat conductivity, specific heat capacity, the density that define rod iron in 20 DEG C of-1000 DEG C of temperature ranges, the heat emissivity coefficient on rod iron surface, Boltzmann's constant.Wherein, for tempered material, the above-mentioned parameter in 20 DEG C of-600 DEG C of temperature ranges can be defined; For quenched materials, the above-mentioned parameter in 20 DEG C of-1000 DEG C of temperature ranges can be defined.
Step 1.7: the grid dividing rod iron.In one embodiment, the density of grid is successively decreased to center by the surface of rod iron, and namely grid is closeer the closer to inductive coil.
Step 1.8: the coupling adopting sequential coupling method to carry out between electromagnetism-heat calculates, first according to the temperature field of starting condition, determine the physical parameter of material, solve electromagnetic problems, so just obtain the hot production rate that electromagnetic field exports, as the thermal source input required for thermal field emulation, then carry out Temperature calculating, simultaneously according to the thermo parameters method of now rod iron, revise the physical parameter of rod iron material, then solve electromagnetic field, so circulate, until arrive the heat time of setting.
Step 2: electromagnetic induction heating process simulation emulates.Specifically comprise the following steps.
Step 2.1: keep the output frequency of induction heating power, output current and output voltage constant, simulation obtains the Temperature Distribution after rod iron heating.
Step 2.2: judge whether the demand meeting heating process based on Temperature Distribution.If judge the demand meeting heating process, then carry out step 3; If judge the demand not meeting heating process, then, after revising this model, again carry out step 1.
Step 3: to the impedance solution procedure analog simulation of inductive coil-rod iron system, specifically comprise the following steps.
Step 3.1: adopt finite element analysis software, get this model 1/4th carry out modeling.
Step 3.2: utilize the front processor of finite element software self create or read in geometric model from other modeling softwares.
Step 3.3: in electromagnetic field analysis part, setting far-field region edge magnetic potential is zero, and rod iron center applies magnetic line of force parallel boundary condition, and the plane of symmetry being arranged corresponding magnetic potential is zero, driving source electric current is applied on the cross section of inductive coil, using the incentive condition as magnetic field.
Step 3.4: the resistivity and the relative permeability that define rod iron in 20 DEG C of-1000 DEG C of temperature ranges, the resistivity of inductive coil and relative permeability, the relative permeability of air.Wherein, for tempered material, the above-mentioned parameter in 20 DEG C of-600 DEG C of temperature ranges can be defined; For quenched materials, the above-mentioned parameter in 20 DEG C of-1000 DEG C of temperature ranges can be defined.
Step 3.5: adopt the method for magnetic field analysis to calculate, simulation obtains equivalent inductance and the equivalent resistance of inductive coil-rod iron system.
Step 3.6: according to the described equivalent inductance of this system and the impedance of equivalent resistance determination induction heating power and building-out capacitor
Induction heating emulation mode according to the embodiment of the present invention has the following advantages:
(1) by carrying out analogue simulation to induction heating process, there is provided theoretical direction based on the configuration of analog result to induction heating power, thus reduce design error, save design cost, shorten the design cycle of induction heating power simultaneously, improve design efficiency;
(2) design parameter of inductive coil can be optimized by analogue simulation at any time, make its efficiency optimization;
(3) by improving the efficiency of induction heating power, directly improving utilization rate of electrical, thus reaching the object of energy-saving and emission-reduction.
In the description of this instructions, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not must for be identical embodiment or example.And the specific features of description, structure, material or feature can combine in one or more embodiment in office or example in an appropriate manner.In addition, when not conflicting, the feature of the different embodiment described in this instructions or example and different embodiment or example can carry out combining and combining by those skilled in the art.
Although illustrate and describe embodiments of the invention above, be understandable that, above-described embodiment is exemplary, can not be interpreted as limitation of the present invention, and those of ordinary skill in the art can change above-described embodiment within the scope of the invention, revises, replace and modification.
Claims (6)
1. an induction heating emulation mode, is characterized in that, comprising:
Step 1: adopt finite element software to set up finite element electromagnetic induction heating process simulation model, comprise the following steps:
Step 1.1: 1/4th of delivery type carries out modeling, and described model comprises the system be made up of steel part, inductive coil and air, described steel part is inserted in described inductive coil;
Step 1.2: utilize the front processor of described finite element software self create or read in geometric model from other modeling softwares;
Step 1.3: in electromagnetic field analysis part, setting far-field region edge magnetic potential is zero, and described steel part center applies magnetic line of force parallel boundary condition, and the plane of symmetry being arranged corresponding magnetic potential is zero, driving source electric current is applied on the cross section of described inductive coil, using the incentive condition as magnetic field;
Step 1.4: the resistivity and the relative permeability that define described steel part in 20 DEG C of-1000 DEG C of temperature ranges, the resistivity of described inductive coil and relative permeability, the relative permeability of air;
Step 1.5: in temperature field analysis part, is all set to dummy cell by described inductive coil and air element, only calculates the thermal field in described steel part region, and described steel part ambient air initial temperature is set as constant; The described steel piece surface contacted with air, only calculates the radiant heat exchange of carrying out with air-grid node;
Step 1.6: the coefficient of heat conductivity, specific heat capacity, the density that define described steel part in 20 DEG C of-1000 DEG C of temperature ranges, the heat emissivity coefficient of described steel piece surface, Boltzmann's constant;
Step 1.7: the grid dividing described steel part;
Step 1.8: the coupling adopting sequential coupling method to carry out between electromagnetism-heat calculates, and first according to the temperature field of starting condition, determines the physical parameter of material, solve electromagnetic problems, so just obtain the hot production rate that electromagnetic field exports, as the thermal source input required for thermal field emulation, then carry out Temperature calculating, simultaneously according to the thermo parameters method of now described steel part, revise the physical parameter of described steel part material, then solve electromagnetic field, so circulate, until arrive the heat time of setting
Step 2: electromagnetic induction heating process simulation emulates, and comprising:
Step 2.1: keep the output frequency of induction heating power, output current and output voltage constant, simulation obtains the Temperature Distribution after the heating of described steel part;
Step 2.2: judge whether the demand meeting heating process based on described Temperature Distribution,
Step 3: to the impedance solution procedure analog simulation of described system, comprising:
Step 3.1: adopt described finite element analysis software, get described model 1/4th carry out modeling;
Step 3.2: utilize the front processor of described finite element software self create or read in geometric model from other modeling softwares;
Step 3.3: in electromagnetic field analysis part, setting far-field region edge magnetic potential is zero, and described steel part center applies magnetic line of force parallel boundary condition, and the plane of symmetry being arranged corresponding magnetic potential is zero, driving source electric current is applied on the cross section of described inductive coil, using the incentive condition as magnetic field;
Step 3.4: the resistivity and the relative permeability that define described steel part in 20 DEG C of-1000 DEG C of temperature ranges, the resistivity of described inductive coil and relative permeability, the relative permeability of air;
Step 3.5: adopt the method for magnetic field analysis to calculate, simulation obtains equivalent inductance and the equivalent resistance of described system;
Step 3.6: impedance and the building-out capacitor of determining described induction heating power according to the described equivalent inductance of described system and equivalent resistance.
2. induction heating emulation mode according to claim 1, is characterized in that, in step 1.7, the density of described grid is successively decreased to center by the surface of described steel part.
3. induction heating emulation mode according to claim 1, is characterized in that, in step 2.2, if judge the demand meeting heating process, then carry out step 3; If judge the demand not meeting heating process, then, after revising described model, again carry out step 1.
4. induction heating emulation mode according to claim 1, is characterized in that,
In step 1.4, define resistivity and the relative permeability of described steel part in 20 DEG C of-600 DEG C of temperature ranges, the resistivity of described inductive coil and relative permeability, the relative permeability of air;
In step 1.6, define coefficient of heat conductivity, specific heat capacity, the density of described steel part in 20 DEG C of-600 DEG C of temperature ranges, the heat emissivity coefficient of described steel piece surface, Boltzmann's constant; And
In step 3.4, define resistivity and the relative permeability of described steel part in 20 DEG C of-600 DEG C of temperature ranges, the resistivity of described inductive coil and relative permeability, the relative permeability of air.
5. induction heating emulation mode according to claim 1, is characterized in that, determines the shape of described inductive coil according to the shape of described steel part.
6. induction heating emulation mode according to claim 5, is characterized in that, the shape of described inductive coil comprises: circle spirality, ellipse spiral shape, square spirality, rectangular coil shape.
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| CN106529005A (en) * | 2016-10-28 | 2017-03-22 | 南昌航空大学 | Method for designing local tempering induction coil of ultrahigh-strength steel threaded type workpiece based on finite element simulation |
| CN107169166A (en) * | 2017-04-17 | 2017-09-15 | 燕山大学 | A kind of computational methods of the portable sensing heating of the bull gear based on ANSYS emulation platforms |
| CN107871037A (en) * | 2017-10-26 | 2018-04-03 | 中国南方电网有限责任公司超高压输电公司广州局 | A kind of 35kV dry reactors internal temperature evaluation method |
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| CN111428378A (en) * | 2020-03-31 | 2020-07-17 | 东北大学 | Resistance heating model applied to thermal field distribution research |
| CN113204848A (en) * | 2021-05-18 | 2021-08-03 | 燕山大学 | Numerical simulation method for induction heating process of large-modulus rack |
| CN113255191A (en) * | 2021-06-10 | 2021-08-13 | 大连理工大学 | Equivalent circuit parameter identification method of induction heating model |
| CN114861504A (en) * | 2022-06-07 | 2022-08-05 | 哈尔滨理工大学 | Induction heating magnetic circuit design method and device |
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| CN106529005A (en) * | 2016-10-28 | 2017-03-22 | 南昌航空大学 | Method for designing local tempering induction coil of ultrahigh-strength steel threaded type workpiece based on finite element simulation |
| CN107169166A (en) * | 2017-04-17 | 2017-09-15 | 燕山大学 | A kind of computational methods of the portable sensing heating of the bull gear based on ANSYS emulation platforms |
| CN107169166B (en) * | 2017-04-17 | 2020-02-25 | 燕山大学 | Large gear ring mobile induction heating calculation method based on ANSYS simulation platform |
| CN107871037A (en) * | 2017-10-26 | 2018-04-03 | 中国南方电网有限责任公司超高压输电公司广州局 | A kind of 35kV dry reactors internal temperature evaluation method |
| CN107871037B (en) * | 2017-10-26 | 2020-09-29 | 中国南方电网有限责任公司超高压输电公司广州局 | Method for estimating internal temperature of 35kV dry-type reactor |
| CN108133071A (en) * | 2017-11-08 | 2018-06-08 | 湖南柯立凯科技开发有限公司 | A kind of hot emulation mode of aluminium electrolutic capacitor |
| CN111428378A (en) * | 2020-03-31 | 2020-07-17 | 东北大学 | Resistance heating model applied to thermal field distribution research |
| CN111428378B (en) * | 2020-03-31 | 2022-03-01 | 东北大学 | Resistance heating model applied to thermal field distribution research |
| CN113204848A (en) * | 2021-05-18 | 2021-08-03 | 燕山大学 | Numerical simulation method for induction heating process of large-modulus rack |
| CN113204848B (en) * | 2021-05-18 | 2022-03-15 | 燕山大学 | Numerical simulation method for induction heating process of large-modulus rack |
| CN113255191A (en) * | 2021-06-10 | 2021-08-13 | 大连理工大学 | Equivalent circuit parameter identification method of induction heating model |
| CN114861504A (en) * | 2022-06-07 | 2022-08-05 | 哈尔滨理工大学 | Induction heating magnetic circuit design method and device |
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