CN113692078A - Curing system and method for magnetic composite material - Google Patents
Curing system and method for magnetic composite material Download PDFInfo
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- CN113692078A CN113692078A CN202110773985.1A CN202110773985A CN113692078A CN 113692078 A CN113692078 A CN 113692078A CN 202110773985 A CN202110773985 A CN 202110773985A CN 113692078 A CN113692078 A CN 113692078A
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- 239000002131 composite material Substances 0.000 title claims abstract description 89
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000010438 heat treatment Methods 0.000 claims abstract description 79
- 239000000463 material Substances 0.000 claims abstract description 28
- 229910052755 nonmetal Inorganic materials 0.000 claims abstract description 3
- 239000006247 magnetic powder Substances 0.000 claims description 21
- 238000000576 coating method Methods 0.000 claims description 13
- 239000011248 coating agent Substances 0.000 claims description 12
- 230000006698 induction Effects 0.000 claims description 9
- 229910010272 inorganic material Inorganic materials 0.000 claims description 9
- 239000011147 inorganic material Substances 0.000 claims description 9
- 239000011368 organic material Substances 0.000 claims description 9
- 239000000843 powder Substances 0.000 claims description 8
- 229920005989 resin Polymers 0.000 claims description 7
- 239000011347 resin Substances 0.000 claims description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 229910019142 PO4 Inorganic materials 0.000 claims description 3
- 239000003570 air Substances 0.000 claims description 3
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 239000007822 coupling agent Substances 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 229920005992 thermoplastic resin Polymers 0.000 claims description 3
- 229920001187 thermosetting polymer Polymers 0.000 claims description 3
- 229910000859 α-Fe Inorganic materials 0.000 claims description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 2
- 239000010452 phosphate Substances 0.000 claims description 2
- 238000009529 body temperature measurement Methods 0.000 claims 3
- 238000001723 curing Methods 0.000 description 27
- 239000000523 sample Substances 0.000 description 23
- 230000008569 process Effects 0.000 description 11
- 239000000696 magnetic material Substances 0.000 description 10
- 239000003990 capacitor Substances 0.000 description 6
- 238000000465 moulding Methods 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 238000000748 compression moulding Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000013007 heat curing Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 235000021317 phosphate Nutrition 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000004320 controlled atmosphere Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 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
-
- 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
- H05B6/06—Control, e.g. of temperature, of power
-
- 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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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Moulding By Coating Moulds (AREA)
- Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
Abstract
The invention discloses a system and a method for curing a magnetic composite material. Wherein the system includes: the heating cavity is capable of controlling atmosphere, the cavity of the heating cavity is used for placing the pressed and molded magnetic composite material, and the heating cavity is made of nonmagnetic and nonmetal materials; a heating coil surrounding the outside of the heating chamber; and controlling the alternating current of the heating coil to generate an alternating magnetic field so as to heat and cure the magnetic composite material. The invention utilizes the loss heating of the magnetic composite material in the alternating magnetic field to uniformly heat the pressed and molded magnetic composite material, and in addition, the accurate control of the temperature of the sample of the magnetic composite material can be realized by controlling the current in the heating coil. The invention can be widely applied to the field of processing of magnetic composite materials.
Description
Technical Field
The invention relates to the field of processing of magnetic composite materials, in particular to a system and a method for curing a magnetic composite material.
Background
The magnetic composite material is a new type of magnetic material formed by insulating and coating magnetic powder and pressing the magnetic powder by a specific process method. The insulating coating process mainly adopts organic coating or the combination of inorganic coating and organic coating. The material used for the organic coating is mainly resin. After the insulated and coated magnetic powder is subjected to compression molding, the resin is solidified by heating, and a cross-linked network structure is formed between magnetic powder interfaces, so that bonding molding is realized.
After the magnetic composite material is formed, the existing curing process of the magnetic composite material is to utilize resistance wires of an oven to generate heat, the heat is transferred to the surface of the material, and the heat on the surface of the material is transferred to the interior of the material to enable the material to reach the curing temperature of resin and be cured, so that the curing process is a heating and curing method from outside to inside. The temperature distribution in the sample is not uniform in the processes of temperature rise and temperature reduction, and the generated stress can cause the sample to crack; meanwhile, in the processes of temperature rise and temperature reduction, the temperature in the sample can not be ensured to be consistent with the temperature in the furnace, and the final forming performance is influenced. Therefore, the resistance wire is used for heating to cure the sample, so that accurate temperature control, rapid temperature rise and temperature reduction and uniform heating of the sample cannot be realized.
Disclosure of Invention
To at least some extent solve one of the technical problems of the prior art, it is an object of the present invention to provide a system and a method for curing a magnetic composite material.
The technical scheme adopted by the invention is as follows:
a system for curing a magnetic composite material, comprising:
the heating cavity is capable of controlling atmosphere, the cavity of the heating cavity is used for placing the pressed and molded magnetic composite material, and the heating cavity is made of nonmagnetic and nonmetal materials;
a heating coil surrounding the outside of the heating chamber;
and controlling the alternating current of the heating coil to generate an alternating magnetic field so as to heat and cure the magnetic composite material.
Further, the magnetic composite material is magnetized under the action of an alternating magnetic field, and magnetic loss is generated, so that heat is generated inside the magnetic composite material;
the magnetic losses include hysteresis loss PhEddy current loss PeResidual loss Pr。
Further, the expression of the magnetic loss is:
Ps＝Ph+Pe+Pr＝KHB3f+KEB2f2/ρ+Pr
wherein, B is magnetic induction intensity; f is the frequency; ρ is the resistivity; kHAnd KEHysteresis loss coefficient and eddy current loss coefficient;
and adjusting the temperature rise speed of the magnetic composite material by adjusting the intensity and frequency of the alternating current in the heating coil.
Further, the curing system for the magnetic composite material further comprises a temperature measuring device, wherein the temperature measuring device is used for measuring a temperature value of the magnetic composite material, and the temperature value is used as a feedback parameter for adjusting the parameter of the alternating current.
Further, the temperature measuring device is a contact temperature measuring device or a non-contact temperature measuring device.
Further, the cavity of the heating cavity is filled with air, argon or nitrogen; or
The cavity of the heating cavity is vacuum.
Further, the magnetic composite material comprises magnetic powder and a powder surface coating material;
the magnetic powder is soft magnetic powder or permanent magnetic powder;
the powder surface coating material is an inorganic material, an organic material or a composite material of the inorganic material and the organic material;
the inorganic material is an oxide, a phosphate, a sulfate or a ferrite; the organic material is a thermoplastic resin, a thermosetting resin or a coupling agent.
The other technical scheme adopted by the invention is as follows:
a method of curing a magnetic composite material comprising the steps of:
putting the pressed and molded magnetic composite material into a cavity of a heating cavity with controllable atmosphere;
placing the heating cavity in an alternating magnetic field;
heating and curing the magnetic composite material of the heating cavity through an alternating magnetic field;
the alternating magnetic field is generated by alternating current of a heating coil, the heating wire surrounds the outside of the heating cavity, and the heating cavity is made of nonmagnetic and nonmetallic materials.
Further, the magnetic composite material is magnetized under the action of an alternating magnetic field, and magnetic loss is generated, so that heat is generated inside the magnetic composite material;
the magnetic losses include hysteresis loss PhEddy current loss PeResidual loss Pr。
Further, the expression of the magnetic loss is:
Ps＝Ph+Pe+Pr＝KHB3f+KEB2f2/ρ+Pr
wherein, B is magnetic induction intensity; f is the frequency; ρ is the resistivity; kHAnd KEHysteresis loss coefficient and eddy current loss coefficient;
and adjusting the temperature rise speed of the magnetic composite material by adjusting the intensity and frequency of the alternating current in the heating coil.
A method for curing a magnetic composite material,
the invention has the beneficial effects that: the invention utilizes the loss heating of the magnetic composite material in the alternating magnetic field to uniformly heat the pressed and molded magnetic composite material, and in addition, the accurate control of the temperature of the sample of the magnetic composite material can be realized by controlling the current in the heating coil.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description is made on the drawings of the embodiments of the present invention or the related technical solutions in the prior art, and it should be understood that the drawings in the following description are only for convenience and clarity of describing some embodiments in the technical solutions of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a front view of a system for curing a magnetic composite material in accordance with an embodiment of the present invention;
FIG. 2 is a side view of a magnetic composite curing system in an embodiment of the present invention;
fig. 3 is a control circuit diagram of a system for curing a magnetic composite material according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention. The step numbers in the following embodiments are provided only for convenience of illustration, the order between the steps is not limited at all, and the execution order of each step in the embodiments can be adapted according to the understanding of those skilled in the art.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
As shown in fig. 1 and 2, the present embodiment provides a curing system for a magnetic composite material, including:
the heating cavity 2 can control the atmosphere, the cavity of the heating cavity 2 is used for placing the magnetic composite material 3 after compression molding, and the heating cavity 2 is made of nonmagnetic and nonmetallic materials;
a heating coil 1 surrounding the outside of the heating chamber 2;
the magnetic composite material is heated and cured by controlling the alternating current of the heating coil 1 to generate an alternating magnetic field.
In the implementation, based on the principle that the magnetic material (i.e. the magnetic composite material) is self-heated in the sample due to energy loss in the repeated magnetization process in the alternating magnetic field, the pressed and molded magnetic composite material is placed in the alternating magnetic field, so that the magnetic powder is heated, the organic matter on the surface is cured, and the pressing and bonding molding of the composite material are realized at the same time. The problems that the internal temperature of a magnetic composite material sample is not uniform in the curing process of the magnetic composite material, and the internal temperature and the temperature rising and reducing rates of the sample cannot be accurately controlled in the temperature rising and reducing processes are solved.
The temperature of the magnetic composite material is raised by utilizing the thermal effect of the magnetic material in the alternating magnetic field; compared with the traditional heat curing process, the molding and curing can be realized in one step, the uniform heating of the whole pressed sample can be realized by utilizing the loss heating of the powder in the alternating magnetic field, and the accurate control of the temperature of the sample can be realized by controlling the current in the heating coil.
Under the action of the alternating magnetic field, the magnet is not only magnetized, but also generates energy loss, namely magnetic loss. The magnetic loss is composed of three parts: hysteresis loss PhEddy current loss PeResidual loss Pr. Losses are closely related to the applied frequency, and experience has shown that the total loss Ps can be expressed as:
Ps＝Ph+Pe+Pr＝KHB3f+KEB2f2/ρ+Pr (1)
in the formula: b is magnetic induction intensity; f is the frequency; ρ is the resistivity; kHAnd KERespectively hysteresis loss coefficient and eddy current loss coefficient.
The magnetic induction in a long solenoid can be considered uniform, and its intensity can be:
in the formula: n is the number of turns of the coil, I is the current passing through it, and l is the coil length.
As can be seen from the formula (1), the magnetic material is in an alternating magnetic field, and the total loss is related to the magnetic induction intensity and the magnetic field intensity. According to the formula (2), the magnetic induction intensity in the solenoid can be controlled by adjusting the intensity of the current in the coil, so that the temperature rising speed of the magnetic composite material is controlled. In addition, after the external magnetic field is stopped being applied, the sample does not generate heat any more, and the sample can be heated instantly after the external magnetic field is applied, so that the problem that the temperature of the sample cannot be directly controlled in the traditional curing process is solved. Because the difference between the magnetic property and the electrical property of different materials is large, and the heat generating mechanism in the alternating magnetic field is different, different types of magnetic materials can be heated by adjusting the intensity and the frequency of alternating current in the coil.
Referring to fig. 3, fig. 3 shows a schematic diagram of a power circuit of a thermal compression molding curing system. After the alternating current source 5 is switched on, the alternating current passes through the rectifier circuit and becomes direct current. The on-off of the circuit is adjusted by the PWM controller, and the LC resonance circuit can continuously work at the resonance frequency by controlling the frequency of the PWM controller, so that the sample (namely the magnetic composite material sample) can be continuously heated at a specific frequency.
Different heating frequencies can be designed for different heat generating mechanisms of different samples by adjusting the capacitance value in the resonant circuit; in general, the magnetic permeability of the magnetic material changes with the increase of temperature, resulting in a change of the operating frequency of the resonant circuit, so by adding a feedback circuit, the frequency of the PWM controller can be made to always coincide with the resonant frequency of the LC resonant circuit. The PWM controller is used as a switch in the circuit, and charges the capacitor when the voltage at two ends of the capacitor in the LC circuit is highest. If the capacitor is not charged, the LC circuit will gradually decrease the oscillation amplitude due to the parasitic resistance. By charging the capacitor when the voltage across the capacitor is highest, the energy in the LC circuit can be kept the same for each oscillation cycle. By adjusting the charging frequency, the amount of energy in the LC circuit can be controlled, keeping the charging at the highest voltage across the capacitor, in order to reduce losses in the circuit.
Through automatic temperature control circuit, the temperature variation of real-time supervision sample, through the frequency of adjusting the PWM controller, make the resonant frequency of LC circuit and the switching frequency of PWM controller become integer ratio, if make the switching frequency of PWM controller be 1/2, 1/3f etc. or change the duty cycle of PWM controller switch, can carry out accurate control to sample temperature variation.
The resonant frequency of an LC resonant circuit can be determined by the inductance L and the capacitance C in the circuit:
the sample after hot press molding is placed in a magnetic field, and samples prepared from different materials can be heated by adjusting the intensity and frequency of current in the coil.
In some optional embodiments, the system for curing a magnetic composite material further comprises a temperature measuring device for measuring a temperature value of the magnetic composite material, wherein the temperature value is used as a feedback parameter for adjusting the parameter of the alternating current. The temperature measuring device is a contact type temperature measuring device (which is detected by a probe or a probe) or a non-contact type temperature measuring device (such as infrared temperature measuring equipment). Referring to fig. 1, in the contact temperature measuring device, a temperature measuring probe 4 is arranged on a magnetic composite material 3, temperature data measured by the temperature measuring probe 4 is used as feedback data, and the frequency of a PWM controller is always consistent with the resonant frequency of an LC resonant circuit according to the feedback data.
In some alternative embodiments, the cavity of the controlled atmosphere heating chamber is filled with air, argon, nitrogen; or the cavity of the heating cavity is vacuum; some magnetic composites require curing in a vacuum or other atmosphere. The heating chamber is not limited to a shape, and may be a closed type or a conveyor belt type.
In some alternative embodiments, the heating coil 1 is not limited in cross-section to a shape such as a rectangle, an ellipse, a multi-strand coil, and the like. The heating temperature can be controlled by parameters such as the current magnitude and the frequency in the heating coil.
In some alternative embodiments, the magnetic composite material 3 is composed of magnetic powder and a powder surface coating material, and the coating material is not limited to inorganic material, organic material, inorganic material and organic material composite coating, and the like. Inorganic materials include, but are not limited to, oxides, phosphates, sulfates, ferrites, and the like, and organic materials include, but are not limited to, thermoplastic resins, thermosetting resins, coupling agents, and the like. The magnetic powder in the magnetic composite material 3 is not limited in kind, such as soft magnetic powder, permanent magnetic powder, etc.; the magnetic powder may be pure magnetic powder or surface-treated magnetic powder, including metal powder and oxide powder. The magnetic composite material 3 is not limited to a ring, a circle, a square, or the like.
The magnetic composite material 3 is not limited to the ratio of the magnetic material and the clad material, and may be, for example, 95 wt% of the magnetic material +5 wt% of the clad material or 50 wt% of the magnetic material +50 wt% of the clad material.
In summary, the present embodiment provides a method for heating and curing a magnetic composite material after press molding. The magnetic composite material is placed in an alternating magnetic field generated by an alternating current coil, and the temperature of the material is raised by utilizing the heat effect of the magnetic material in the alternating magnetic field, so that the resin around the magnetic powder is solidified, and the bonding forming of the composite material is realized. In addition, different heating schemes can be designed by controlling the current intensity and frequency of the alternating current introduced into the electromagnetic coil, and the heating temperature can be accurately controlled. Compared with the traditional heat curing process, the embodiment uses the loss heating of the material in the alternating magnetic field, so that the material to be cured can be uniformly heated, and the heat defects are reduced.
The embodiment also provides a method for curing the magnetic composite material, which comprises the following steps:
putting the pressed and molded magnetic composite material into a cavity of a heating cavity with controllable atmosphere;
placing the heating cavity in an alternating magnetic field;
heating and curing the magnetic composite material of the heating cavity through an alternating magnetic field;
the alternating magnetic field is generated by alternating current of a heating coil, the heating wire surrounds the outside of the heating cavity, and the heating cavity is made of nonmagnetic and nonmetallic materials.
As a further optional embodiment, the magnetic composite material is magnetized under the action of an alternating magnetic field, and magnetic loss is generated, so that heat is generated inside the magnetic composite material;
the magnetic losses include hysteresis loss PhEddy current loss PeResidual loss Pr。
As a further alternative, the expression of the magnetic loss is:
Ps＝Ph+Pe+Pr＝KHB3f+KEB2f2/ρ+Pr
wherein, B is magnetic induction intensity; f is the frequency; ρ is the resistivity; kHAnd KEHysteresis loss coefficient and eddy current loss coefficient;
and adjusting the temperature rise speed of the magnetic composite material by adjusting the intensity and frequency of the alternating current in the heating coil.
The curing method of the magnetic composite material of the present embodiment has a corresponding relationship with the curing system of the magnetic composite material, and thus has corresponding functions and beneficial effects.
In the foregoing description of the specification, reference to the description of "one embodiment/example," "another embodiment/example," or "certain embodiments/examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A system for curing a magnetic composite material, comprising:
the heating cavity is capable of controlling atmosphere, the cavity of the heating cavity is used for placing the pressed and molded magnetic composite material, and the heating cavity is made of nonmagnetic and nonmetal materials;
a heating coil surrounding the outside of the heating chamber;
and controlling the alternating current of the heating coil to generate an alternating magnetic field so as to heat and cure the magnetic composite material.
2. The system for curing a magnetic composite material according to claim 1, wherein the magnetic composite material is magnetized by an alternating magnetic field and generates magnetic loss to generate heat inside the magnetic composite material;
the magnetic losses include hysteresis loss PhEddy current loss PeResidual loss Pr。
3. The system for curing a magnetic composite material according to claim 2, wherein the magnetic loss is expressed by:
Ps＝Ph+Pe+Pr＝KHB3f+KEB2f2/ρ+Pr
wherein, B is magnetic induction intensity; f is the frequency; ρ is the resistivity; kHAnd KEHysteresis loss coefficient and eddy current loss coefficient;
and adjusting the temperature rise speed of the magnetic composite material by adjusting the intensity and frequency of the alternating current in the heating coil.
4. The system of claim 1, further comprising a temperature measuring device for measuring a temperature of the magnetic composite material, wherein the temperature is used as a feedback parameter for adjusting the alternating current.
5. The system of claim 1, wherein the temperature measurement device is a contact temperature measurement device or a non-contact temperature measurement device.
6. The system for curing a magnetic composite material according to claim 1, wherein the cavity of the heating chamber is filled with air, argon or nitrogen; or,
the cavity of the heating cavity is vacuum.
7. The system for curing a magnetic composite material according to claim 1, wherein the magnetic composite material comprises a magnetic powder and a powder surface coating material;
the magnetic powder is soft magnetic powder or permanent magnetic powder;
the powder surface coating material is an inorganic material, an organic material or a composite material of the inorganic material and the organic material;
the inorganic material is an oxide, a phosphate, a sulfate or a ferrite; the organic material is a thermoplastic resin, a thermosetting resin or a coupling agent.
8. A method of curing a magnetic composite material, comprising the steps of:
putting the pressed and molded magnetic composite material into a cavity of a heating cavity with controllable atmosphere;
placing the heating cavity in an alternating magnetic field;
heating and curing the magnetic composite material of the heating cavity through an alternating magnetic field;
the alternating magnetic field is generated by alternating current of a heating coil, the heating wire surrounds the outside of the heating cavity, and the heating cavity is made of nonmagnetic and nonmetallic materials.
9. The method for curing a magnetic composite material according to claim 8, wherein the magnetic composite material is magnetized by an alternating magnetic field and generates magnetic loss to generate heat inside the magnetic composite material;
the magnetic losses include hysteresis loss PhEddy current loss PeResidual loss Pr。
10. The method of claim 9, wherein the magnetic loss is expressed by:
Ps＝Ph+Pe+Pr＝KHB3f+KEB2f2/ρ+Pr
wherein, B is magnetic induction intensity; f is the frequency; ρ is the resistivity; kHAnd KEHysteresis loss coefficient and eddy current loss coefficient;
and adjusting the temperature rise speed of the magnetic composite material by adjusting the intensity and frequency of the alternating current in the heating coil.
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