CN104576017A - Manufacturing method of amorphous alloy iron core for transformer with high saturation magnetization and low loss - Google Patents
Manufacturing method of amorphous alloy iron core for transformer with high saturation magnetization and low loss Download PDFInfo
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- CN104576017A CN104576017A CN201310513400.8A CN201310513400A CN104576017A CN 104576017 A CN104576017 A CN 104576017A CN 201310513400 A CN201310513400 A CN 201310513400A CN 104576017 A CN104576017 A CN 104576017A
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Abstract
The invention relates to a manufacturing method of an amorphous alloy iron core for a transformer with high saturation magnetization and low loss. The manufacturing method comprises the following steps of putting a wound iron-based amorphous alloy iron core into a heat treatment hearth; closing a furnace door, utilizing a vacuum mechanical pump to pump initial vacuum, then utilizing a molecular pump to continuously pump high vacuum, and keeping vacuum; utilizing a temperature control device to heat up to be 650K so as to shorten time, and then heating up to be heat treatment temperature; preserving heat for a certain time, and applying a longitudinal magnetic field to the iron core part placed in the heat treatment hearth during the heat preservation process; cooling a furnace to be room temperature after finishing heat preservation, and then stopping applying the magnetic field; taking the heat-processed iron core out, and coating epoxy resin on the surface of the iron core to solidify. Compared with the prior art, the product provided by the invention has the advantages of high saturation magnetization, low loss and the like.
Description
Technical field
The invention belongs to the Field of Heat-treatment of material, especially relate to a kind of high saturation and magnetic intensity and low-loss transformer amorphous alloy iron core method for making.
Background technology
In most cases at present, because the voltage range of electric energy is different, from power station to user at least through 5 grades of transformers, low voltage equipment (380/220V) can be input into.Although the efficiency of transformer own is very high, because its quantity is many, capacity large, total loss are very large.According to estimates, the total loss of China's transformer account for about 10% of systems generate electricity amount, and loss often reduces by 1%, can save over ten billion degree electric energy every year, and therefore reducing transformer loss is imperative conservation measures.Open circuit loss in transformer loss and iron loss, mainly occur in transformer core lamination, is the loss brought because the magnetic line of force of alternation produces magnetic hysteresis and eddy current by iron core.The conventional soft magnetic materials that current application is wider or siliconized plate, although its soft magnetic property is better, resistivity is little, and thus eddy current is comparatively large, and iron loss is comparatively large, and energy consumption is also larger.Simultaneously soft magnetic property and the resistance etc. of siliconized plate are relevant with si content, and according to the study, the si content of 6%, soft magnetic property is best, and resistance is also larger.But when si content is more than 4.5%, silicon steel fragility increases, and rolled sheet is just had any problem, and therefore silicon steel si content rarely exceeds 4.5%, when institute is for transformer and electric motor, generator iron-core, copper loss, iron loss are still comparatively large, and are difficult to there is breakthrough again.
Countries in the world all produce energy-saving material in active research in recent years, and the core material of transformer also develops into energy-saving material advanced at present: amorphous magnetic material, and amorphous alloy appendiron core transformer just arises at the historic moment.Fe-based amorphous alloy material is owing to having excellent energy saving standard performance, and thus the transformer of amorphous alloy iron core gains great popularity in recent years.
Amorphous alloy material is compared with traditional silicon steel material, and coercive force is little, and iron loss is low, and resistivity is high, and thus the loss of its transformer core is much smaller relative to silicon steel.But also there is certain shortcoming in its application on the transformer, such as its saturation magnetization is relatively low, the lamination coefficient of band is lower, magnetostriction is high, stress is larger, thus causing transformer noise relatively high, is limit its principal element applied on transformer core.Research shows, by suitable thermal treatment process, can form a certain size nano-crystalline granule in the matrix of non-crystaline amorphous metal, thus improves the magnetic property of band.But thermal treatment process is very large on the impact of magnetic, inappropriate thermal treatment can worsen the magnetic property of strip on the contrary.Therefore, in the urgent need to developing a kind of thermal treatment process that can improve transformer amorphous alloy iron core soft magnetic performance, thus promote that the policy of our energy-saving and emission-reduction is also implemented in the development of China's iron-based amorphous state soft magnetic material and device related industries thereof conscientiously.
Summary of the invention
Object of the present invention be exactly in order to overcome above-mentioned prior art exist defect and a kind of high saturation and magnetic intensity and low-loss transformer amorphous alloy iron core method for making are provided.
Object of the present invention can be achieved through the following technical solutions: a kind of high saturation and magnetic intensity and low-loss transformer amorphous alloy iron core method for making, is characterized in that, comprise the following steps:
(1) iron-based non-crystalline alloy iron core good for coiling is put into thermal treatment burner hearth;
(2) close fire door, utilize vacuum mechanical pump to take out initial vacuum, then continue pumping high vacuum with molecular pump, and keep vacuum;
(3) utilize temperature controlling instruments to be warming up to 650K with the shortening time, be then warming up to thermal treatment temp;
(4) held for some time, applies longitudinal magnetic field to placing core portion in thermal treatment burner hearth in insulating process;
(5) insulation terminates rear stove and is chilled to room temperature, then stops applying magnetic field;
(6) iron core after thermal treatment is taken out, and at iron core surface-coated epoxy resin cure.
Once can place multiple iron-based non-crystalline alloy iron core in thermal treatment burner hearth described in step (1), each iron-based non-crystalline alloy iron core is all in the flat-temperature zone of burner hearth.
Initial vacuum described in step (2) is below 1Pa, and high vacuum is 10
-3below pa.
Thermal treatment temp described in step (3) is that the initial crystallization made in the thermal analyses DSC curve of iron-based non-crystalline alloy iron core alloy strip steel rolled stock starts temperature.
The heating rate being warming up to 650K described in step (3) is greater than 15K/ minute, and the heating rate being warming up to thermal treatment temp is less than 5K/ minute.
Soaking time described in step (4) is 1 ~ 2 hour; Longitudinal magnetic field is produced by electric current by the copper coil being wrapped in thermal treatment hearth outer wall, and size of current is 100Oe ~ 400Oe.
The epoxy thickness of the surface-coated described in step (6) is between 0.5mm to 1.5mm.
Compared with prior art, the present invention is mainly the problem of stress in the lower and iron core of the saturation magnetization solving current transformer iron-based non-crystalline soft magnetic alloy core, provides a kind of thermal treatment process with high saturation and magnetic intensity and low-loss transformer iron-based non-crystalline alloy iron core.The thermal treatment process of transformer iron-based non-crystalline alloy iron core of the present invention effectively can improve the saturation magnetization of iron core, reduces the loss of iron core, and by epoxy resin cure, reduces iron core stress, meet the requirement of transformer application.
Accompanying drawing explanation
Fig. 1 is the DSC curve of typical amorphous band.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment 1:
Fig. 1 is the DSC curve of typical amorphous band.As can be seen from curve, this amorphous band has a crystallization peak respectively at 780K and 830K place, and 780K is that the crystallization at initial crystallization peak starts temperature (T
c1), 830K is that the crystallization at secondary crystallization peak starts temperature (T
c2).Time near heating temperatures to 780K, uniform amorphous phase inside will form crystal phase because the thermal motion of atom overcomes the potential barrier of crystallization, and makes initial crystallization aggravate along with the rising of temperature.Initial crystallization will produce the α-Fe phase crystal grain of nano-scale, and it, by interacting with the magnetic coupling of amorphous border phase, can reduce the coercive force of material greatly.And raised temperature to 830K, then starts to occur secondary crystallization further, form FeB chemical compound, and cause abnormal grain growth, the magnetic property of material is worsened.
This good for coiling amorphous alloy strips iron core 5 is only put into heat treatment furnace, closes fire door, utilize vacuum mechanical pump to take out initial vacuum to 1Pa, then continue pumping high vacuum to 10 with molecular pump
-3pa, continues utilize molecular pump to vacuumize and keep vacuum; Utilize heat treatment furnace temp-controlling element to be warming up to 650K with 20K/ minute heating rate, be then warming up to thermal treatment temp 780K with 3K/ minute; Be incubated 1 hour, and in insulating process, utilize energising copper coil to apply to placing core portion in thermal treatment burner hearth the longitudinal magnetic field that size is 300Oe; Be chilled to room temperature with stove after insulation terminates, then stop applying magnetic field; Take out the iron core after thermal treatment, and be cured at the epoxy resin of iron core surface-coated 1mm thickness; Namely iron core finished product is obtained after cured.
Obtained by the performance utilizing magnetic parameter and electrical parameter measurement instrument to measure iron core, after thermal treatment, the average open circuit loss of iron core is 0.246W/kg, and average saturation magnetization is 1.4T.This iron loss is lower than the 0.3W/kg of transformer service requirements.
Contrast with normative heat treatment: use identical iron core, after normative heat treatment (not applying magnetic field in heat treatment process), the open circuit loss of its iron core is 0.446W/kg, and saturation magnetization is 1.2T.Can find out, compared with normative heat treatment technique, the transformer amorphous alloy iron core using thermal treatment process belonging to the present invention to make has low open circuit loss and high saturation magnetization.
Embodiment 2:
By amorphous alloy strips iron core good for coiling totally 10 put into heat treatment furnace, close fire door, utilize vacuum mechanical pump to take out initial vacuum to 1Pa, then with molecular pump continue pumping high vacuum to 10
-3pa, continues utilize molecular pump to vacuumize and keep vacuum; Utilize heat treatment furnace temp-controlling element to be warming up to 650K with 15K/ minute heating rate, be then warming up to thermal treatment temp 750K with 2K/ minute; Be incubated 2 hours, and in insulating process, utilize energising copper coil to apply to placing core portion in thermal treatment burner hearth the longitudinal magnetic field that size is 200Oe; Be chilled to room temperature with stove after insulation terminates, then stop applying magnetic field; Take out the iron core after thermal treatment, and be cured at the epoxy resin of iron core surface-coated 1mm thickness; Namely iron core finished product is obtained after cured.
Obtained by the performance utilizing magnetic parameter and electrical parameter measurement instrument to measure iron core, after thermal treatment, the average open circuit loss of iron core is 0.266W/kg, and average saturation magnetization is 1.46T.This iron loss is lower than the 0.3W/kg of transformer service requirements.
Embodiment 3:
By amorphous alloy strips iron core good for coiling totally 1 put into heat treatment furnace, close fire door, utilize vacuum mechanical pump to take out initial vacuum to 1Pa, then with molecular pump continue pumping high vacuum to 10
-3pa, continues utilize molecular pump to vacuumize and keep vacuum; Utilize heat treatment furnace temp-controlling element to be warming up to 650K with 25K/ minute heating rate, be then warming up to thermal treatment temp 720K with 5K/ minute; Be incubated 2 hours, and in insulating process, utilize energising copper coil to apply to placing core portion in thermal treatment burner hearth the longitudinal magnetic field that size is 400Oe; Be chilled to room temperature with stove after insulation terminates, then stop applying magnetic field; Take out the iron core after thermal treatment, and be cured at the epoxy resin of iron core surface-coated 0.5mm thickness; Namely iron core finished product is obtained after cured.
Obtained by the performance utilizing magnetic parameter and electrical parameter measurement instrument to measure iron core, after thermal treatment, the average open circuit loss of iron core is 0.21W/kg, and average saturation magnetization is 1.35T.This iron loss is lower than the 0.3W/kg of transformer service requirements.
Claims (7)
1. high saturation and magnetic intensity and a low-loss transformer amorphous alloy iron core method for making, is characterized in that, comprise the following steps:
(1) iron-based non-crystalline alloy iron core good for coiling is put into thermal treatment burner hearth;
(2) close fire door, utilize vacuum mechanical pump to take out initial vacuum, then continue pumping high vacuum with molecular pump, and keep vacuum;
(3) utilize temperature controlling instruments to be warming up to 650K with the shortening time, be then warming up to thermal treatment temp;
(4) held for some time, applies longitudinal magnetic field to placing core portion in thermal treatment burner hearth in insulating process;
(5) insulation terminates rear stove and is chilled to room temperature, then stops applying magnetic field;
(6) iron core after thermal treatment is taken out, and at iron core surface-coated epoxy resin cure.
2. a kind of high saturation and magnetic intensity according to claim 1 and low-loss transformer amorphous alloy iron core method for making, it is characterized in that, once can place multiple iron-based non-crystalline alloy iron core in thermal treatment burner hearth described in step (1), each iron-based non-crystalline alloy iron core is all in the flat-temperature zone of burner hearth.
3. a kind of high saturation and magnetic intensity according to claim 1 and low-loss transformer amorphous alloy iron core method for making, it is characterized in that, the initial vacuum described in step (2) is below 1Pa, and high vacuum is 10
-3below pa.
4. a kind of high saturation and magnetic intensity according to claim 1 and low-loss transformer amorphous alloy iron core method for making, it is characterized in that, the thermal treatment temp described in step (3) is that the initial crystallization made in the thermal analyses DSC curve of iron-based non-crystalline alloy iron core alloy strip steel rolled stock starts temperature.
5. a kind of high saturation and magnetic intensity according to claim 1 and low-loss transformer amorphous alloy iron core method for making, it is characterized in that, the heating rate being warming up to 650K described in step (3) is greater than 15K/ minute, and the heating rate being warming up to thermal treatment temp is less than 5K/ minute.
6. a kind of high saturation and magnetic intensity according to claim 1 and low-loss transformer amorphous alloy iron core method for making, it is characterized in that, the soaking time described in step (4) is 1 ~ 2 hour; Longitudinal magnetic field is produced by electric current by the copper coil being wrapped in thermal treatment hearth outer wall, and magnitude of field intensity is 100Oe ~ 400Oe.
7. a kind of high saturation and magnetic intensity according to claim 1 and low-loss transformer amorphous alloy iron core method for making, it is characterized in that, the epoxy thickness of the surface-coated described in step (6) is between 0.5mm to 1.5mm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106558415A (en) * | 2016-11-21 | 2017-04-05 | 东莞市大忠电子有限公司 | A kind of manufacture method of nanocrystalline common mode inductance |
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2013
- 2013-10-25 CN CN201310513400.8A patent/CN104576017A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106558415A (en) * | 2016-11-21 | 2017-04-05 | 东莞市大忠电子有限公司 | A kind of manufacture method of nanocrystalline common mode inductance |
| CN106558415B (en) * | 2016-11-21 | 2018-05-25 | 东莞市大忠电子有限公司 | A kind of production method of nanocrystalline common mode inductance |
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Application publication date: 20150429 |