CN109994311A - A kind of resistance to shorting amorphous alloy transformer core noise-reduction method - Google Patents
A kind of resistance to shorting amorphous alloy transformer core noise-reduction method Download PDFInfo
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- CN109994311A CN109994311A CN201910344758.XA CN201910344758A CN109994311A CN 109994311 A CN109994311 A CN 109994311A CN 201910344758 A CN201910344758 A CN 201910344758A CN 109994311 A CN109994311 A CN 109994311A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0206—Manufacturing of magnetic cores by mechanical means
- H01F41/0213—Manufacturing of magnetic circuits made from strip(s) or ribbon(s)
- H01F41/0226—Manufacturing of magnetic circuits made from strip(s) or ribbon(s) from amorphous ribbons
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0206—Manufacturing of magnetic cores by mechanical means
- H01F41/0233—Manufacturing of magnetic circuits made from sheets
Abstract
The invention discloses a kind of resistance to shorting amorphous alloy transformer iron core noise-reduction methods, include following steps: selecting the amorphous alloy monolithic with a thickness of 0.020mm~0.30mm, prepare amorphous alloy core；Magnetic-field heat treatment is carried out to amorphous alloy core；Remove amorphous alloy core residual stress；Detect the no-load loss and exciting power of amorphous alloy.Pass through this method, amorphous alloy core can reach resistance to shorting requirement, no-load loss is better than country and grid company standard requirements, iron core noise is reduced into 4-5dB simultaneously, the case where requirement of invitation for bid for meeting grid company sensitizing range, reduces noise figure from source, will not generate the running noises increase with product, solve putting into operation with transformer, it is difficult to the problem of reducing amorphous alloy transformer iron core noise.
Description
Technical field
The present invention relates to transformer core manufacturing fields, and in particular to a kind of resistance to shorting amorphous alloy transformer core noise reduction
Method.
Background technique
Amorphous alloy is made of 80%Fe and 20%Si, B metalloid element, with excellent magnetism, corrosion resistance, wear-resisting
Property, higher intensity, hardness and toughness, higher resistivity and mechanical-electric coupling performance etc..Be widely used in distribution transformer,
The numerous areas such as high power switching power supply, magnetic amplifier, inverter, reactor and motor.
With the production domesticization of amorphous alloy strips, amorphous alloy strips in transformer industry with more and more extensive；
In recent years, more stringent requirements are proposed for quality of the people to power supply, and former grid company is when carrying out power transformer product bid, to non-
Peritectic alloy transformer noise has carried out the division of sensitizing range and non-sensitive area, and the noise level in non-sensitive area is 3- higher than sensitizing range
4dB；From the point of view of the bidding document of recent grid company, grid company is not distinguishing sensitizing range and non-sensitive area, all productions
Product press sensitizing range and carry out noise level requirements.
Currently, the method for control noise has in amorphous alloy iron core end coating solidification glue and is closed with insulating materials to amorphous
Golden iron core carries out integral coating etc..But these methods do not reduce the noise level of amorphous alloy iron core itself fundamentally, with
Putting into operation for transformer, solidification glue and insulating materials can continuous aging, the noise figure of product will increase with it.
Summary of the invention
The purpose of the present invention is to provide a kind of resistance to shorting amorphous alloy transformer core noise-reduction methods, solve with transformation
Device puts into operation, it is difficult to the problem of reducing amorphous alloy transformer core noise.
In order to solve the above technical problems, the invention adopts the following technical scheme: a kind of resistance to shorting amorphous alloy transformer
Iron core noise-reduction method, includes following steps:
Step 1: selecting the amorphous alloy monolithic with a thickness of 0.020mm~0.30mm, prepare amorphous alloy iron core；
Step 2: magnetic-field heat treatment is carried out to amorphous alloy iron core；
Step 3: removal amorphous alloy iron core residual stress；
Step 4: detecting the no-load loss and exciting power of amorphous alloy；
Further, the step 2 includes following steps:
Step S1: resistance to shorting amorphous alloy iron core is installed in heating furnace；
Step S2: first heating；
Step S3: balanced each amorphous alloy iron core temperature；
Step S4: secondary temperature elevation；
Step S5: slowly heating and heat preservation；
Step S6: cooling；
Further, the mounting means of amorphous alloy iron core in heating furnace in the step S1 are as follows: be divided into N layers of peace from top to bottom
Dress；Every layer is equipped with M row's amorphous alloy iron core；It include L amorphous alloy iron core on every row；Described N, M, L are even number；
Further, the amorphous alloy iron core in heating furnace is together in series with copper conductor；The copper conductor is from each amorphous
It is passed through at the center of alloy-iron core；The copper conductor is connected to field ionization source；
Further, the insertion temperature test probe in the amorphous alloy iron core for being located at vertex；
Further, the step of heating up for the first time in the step S2 are as follows: the fire door for closing heating furnace is filled with nitrogen into heating furnace
Gas is heated up with 1.46 DEG C/min~1.83 DEG C/min speed；
Further, in the step S3 the step of balanced each iron core temperature are as follows: detect that an amorphous closes when being warming up to for the first time
It when the temperature of golden iron core reaches 220 DEG C, opens field ionization source and copper conductor is powered, and stop heating and kept the temperature；Insulating process
Mutual temperature difference≤5 DEG C of the amorphous alloy iron core of middle monitoring, soaking time≤120min；
Further, in the step S4 the step of secondary temperature elevation are as follows: after each amorphous alloy iron core temperature equalization, with 1.83
DEG C/speed of min~2.00/min heats up, until detecting that the temperature of an amorphous alloy iron core reaches 330 DEG C；
Further, the step of slowly heating up and keep the temperature in the step S5 are as follows: when the temperature for detecting an amorphous alloy iron core
After degree reaches 330 DEG C, it will heat up speed and be reduced to, the time is 90min~120min；Maximum temperature≤360 DEG C；
Further technical solution is the cooling step in the step S6 are as follows: closes nitrogen, heating furnace door is opened, with 1.1
DEG C/min~1.3 DEG C/min speed cools down, until the temperature of all amorphous alloy iron cores of monitoring≤200 DEG C after, close
Field ionization source is closed, is further continued for being cooled to room temperature.
Compared with prior art, the beneficial effects of the present invention are:
By this method, amorphous alloy iron core can reach resistance to shorting requirement, and no-load loss is wanted better than country and grid company standard
It asks, while iron core noise is reduced into 4-5dB, meet the requirement of invitation for bid of grid company sensitizing range, noise figure is reduced from source,
The case where running noises increase with product will not be generated.
Production efficiency is improved in hierarchal arrangement amorphous alloy iron core, effective use space from top to bottom in heating furnace, and logical
It crosses and is inserted into temperature test probe in the amorphous alloy iron core of vertex, can accurately measure and control the mean temperature in furnace,
Conducive to the temperature adjusted during magnetic-field heat treatment.
Each amorphous alloy iron core is together in series with copper conductor, the field ionization source of copper conductor and setting in heating furnace connects
It connects, after connecting field ionization source, each amorphous alloy iron core can access magnetization.
Detailed description of the invention
Fig. 1 is resistance to shorting amorphous alloy iron core top view.
Fig. 2 is resistance to shorting amorphous alloy iron core side view.
Fig. 3 is resistance to shorting amorphous alloy iron core main view.
Fig. 4 is that the plane that the resistance to shorting amorphous alloy iron core of one embodiment of the invention arranges in heating furnace sprawls signal
Figure.
Fig. 5 is the flow diagram of one embodiment of the invention.
Fig. 6 is the flow diagram of magnetic-field heat treatment in one embodiment of the invention.
In attached drawing: 1. seams.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
Embodiment 1: as shown in Figure 1, a kind of resistance to shorting amorphous alloy transformer core noise-reduction method, includes following step
It is rapid:
Step 1: selecting the amorphous alloy monolithic with a thickness of 0.020mm~0.30mm, prepare amorphous alloy iron core；
Step 2: magnetic-field heat treatment is carried out to amorphous alloy iron core；
Step 3: removal amorphous alloy iron core residual stress；
Step 4: detecting the no-load loss and exciting power of amorphous alloy iron core.
It is convenient for shear forming using with a thickness of the amorphous alloy monolithic of 0.020mm~0.30mm, using the non-of suitable thickness
Peritectic alloy monolithic can enhance the efficiency that magnetic-field heat treatment is carried out to amorphous alloy；Prepare the concrete operations of amorphous alloy iron core
Are as follows: amorphous alloy strips coiled strip is cut into design size, is guaranteed after amorphous alloy iron core forms, joining seam position overlaps size
Not less than 8mm, guaranteeing product, magnetic circuit is unimpeded at runtime；If this size less than 8mm, will lead to, magnetic circuit is unsmooth, and increase product is empty
Load-loss is also possible to burn iron core when too small, causes product operation troubles；This size is if more than 9mm, to the no-load loss of product
Improve unobvious, causes waste of material.Using fan-shaped distribution at joining seam, reduce the overall dimension at joining seam.Obtained amorphous closes
Golden iron core it is as shown in Figures 1 to 3.
Remove the concrete operations of amorphous alloy iron core residual stress are as follows: being cooled to room temperature after magnetic-field heat treatment will be have passed through
Amorphous alloy iron core be placed in detection platform, detection probe pass through amorphous alloy iron core, in amorphous alloy iron core in addition to joining seam
Three faces with rubber hammer with 20 Ns rice power uniformly tap, remove residual stress.It can be improved by removal residual stress non-
Peritectic alloy iron core performance；The power used when percussion is not easy excessive, causes the amorphous alloy of thinner thickness impaired, can be to non-after being damaged
The noise abatement performance of peritectic alloy iron core generates strong influence；The power used when percussion is not easy too small, will lead to participation stress elimination
It is not thorough and unevenly, influences the performance of amorphous alloy iron core.
Detect the no-load loss of amorphous alloy iron core and the concrete operations of exciting power are as follows: detecting electric current as 0.7A, examining
It surveys under conditions of voltage is 39V, the no-load loss and exciting power of each amorphous alloy iron core is detected, when detecting zero load
Loss≤0.18w/kg, to get the resistance to shorting amorphous alloy iron core completed to noise reduction when exciting power≤0.30VA/kg, finally
Test noise performance is carried out by the condition that analogue transformer operates normally.
The specific steps of magnetic-field heat treatment are carried out as shown in fig. 6, include following steps to amorphous alloy core,
Step S1: amorphous alloy iron core is installed in heating furnace；
Step S2: first heating；
Step S3: balanced each amorphous alloy iron core temperature；
Step S4: secondary temperature elevation；
Step S5: slowly heating and heat preservation；
Step S6: cooling.
Wherein, in heating furnace install amorphous alloy iron core concrete operations are as follows: check connection electrical power control cabinet, furnace body,
Field ionization source control system and nitrogen control system are normally packed into amorphous alloy iron core afterwards；Amorphous alloy iron core is from top to bottom in bracket
On divide N layers of progress shove charge, it includes L amorphous alloy iron core on every row that every layer, which is lined up M row,；Divide from top to bottom in heating furnace
Layer arrangement amorphous alloy iron core, efficiently uses space, improves production efficiency.With copper conductor by the amorphous alloy iron core in heating furnace
It is together in series；Copper conductor passes through from the center of each amorphous alloy iron core；Copper conductor is connected to field ionization source；Guarantee connecting
After field ionization source, each iron core can be magnetized；Copper conductor must not be contacted with amorphous alloy iron core, bracket and furnace wall, such as be connect
Touching can generate circulating current, burning apparatus.The insertion temperature test probe in the amorphous alloy iron core for being located at vertex；Temperature is surveyed
The insertion position of probe header is in the middle part of iron core thickness, and insertion depth is the half of amorphous alloy iron core height；By the way that temperature is surveyed
Probe header is inserted into the middle part of iron core thickness, and temperature test probe insertion depth is the half of iron core height, can effectively measure iron core
Body temperature avoids being not allowed because temperature measures, properties of product is caused not reach requirement.
The concrete operations to heat up for the first time are as follows: the fire door for closing heating furnace is filled with nitrogen into heating furnace, with 1.46 DEG C/min
The speed of~1.83 DEG C/min heats up.
Nitrogen can guarantee that iron core will not be oxidized in entire technical process, and iron core no-load loss is caused to increase；With 1.46
DEG C/min~1.83 DEG C/min speed heats up, iron core inside and outside temperature can be effectively ensured and uniformly increase；Heating rate compared with
Fastly, it is excessive to will lead to iron core inside and outside temperature difference, eventually leads to iron core inside and outside iron core no-load loss and has big difference；Heating speed
Degree is slower, will lead to a large amount of consumption of the energy, causes the waste of resource.
The concrete operations of balanced each amorphous alloy core temperature are as follows: detect an amorphous alloy iron core when being warming up to for the first time
Temperature open field ionization source and copper conductor be powered when reaching 220 DEG C, and stop heating and kept the temperature；It is monitored in insulating process
Mutual temperature difference≤5 DEG C of amorphous alloy iron core, soaking time≤120min.
The voltage 0.3V of field ionization source, electric current 1300A-1800A；It is the magnetized excitation temperature of iron core when temperature reaches 220 DEG C
Degree, temperature is too low or excessively high will affect iron core magnetic efficiency；Stop heating, furnace body is kept the temperature, monitored iron core is made
Temperature is no more than 5 DEG C each other, and the time must not exceed 120 minutes；Guarantee that each iron core performance is consistent, if temperature difference is excessive,
It is excessive that final products performance difference will be will lead to.
The concrete operations of secondary temperature elevation are as follows: after each amorphous alloy iron core temperature equalization, with 1.83 DEG C/min~2.00/
The speed of min heats up, until detecting that the temperature of an amorphous alloy iron core reaches 330 DEG C.
During secondary temperature elevation, heating rate is fast compared with the speed to heat up for the first time, can speed up core material molecular motion, has
It conducive to magnetized completion, improves efficiency, but the speed to heat up is not easy too fast, once going beyond the scope, then will lead to amorphous alloy
The noise of core increases, and influences performance.
Slowly heating and the concrete operations of incubation step are as follows: when the temperature for detecting an amorphous alloy iron core reaches 330
After DEG C, it will heat up speed and be reduced to 0.25 DEG C/min~0.33 DEG C/min, the time is 90min~120min；Maximum temperature≤360
℃。
After secondary temperature elevation, heating rate is reduced rapidly compared to secondary temperature elevation speed, can be refined using slow heating
Core material molecules align guarantees the suppleness of core material, it is ensured that iron core has preferable anti-short circuit capability, slowly heats up
Speed once goes beyond the scope, then the noise of amorphous alloy iron core can be made to increase；If temperature is more than 360 DEG C in insulating process, iron
Core will become hard and brittle, and be unfavorable for later period assembly, and anti-short circuit capability is poor.
The concrete operations of cooling step are as follows: cooling step are as follows: close nitrogen, open heating furnace door, with 1.1 DEG C/min~
The speed of 1.3 DEG C/min cools down, until monitoring all amorphous alloy cores temperature≤200 DEG C after, close field ionization source,
It is further continued for being cooled to room temperature.
When iron core temperature is reduced to 200 DEG C, it is lower than magnetized excitation temperature, core material molecule will not occur again at this time
Change.In temperature-fall period, the speed of cooling be not easy it is too fast, otherwise will lead to amorphous alloy iron core noise increase.
Embodiment 2: a kind of resistance to shorting amorphous alloy transformer core noise-reduction method, includes following steps:
Step 1: selecting the amorphous alloy monolithic with a thickness of 0.020mm~0.30mm, prepare amorphous alloy iron core；
Step 2: magnetic-field heat treatment is carried out to amorphous alloy iron core；
Step 3: removal amorphous alloy iron core residual stress；
Step 4: detecting the no-load loss and exciting power of amorphous alloy iron core.
The specific steps of magnetic-field heat treatment are carried out as shown in fig. 6, include following steps to amorphous alloy core,
Step S1: amorphous alloy iron core is installed in heating furnace；
Step S2: first heating；
Step S3: balanced each amorphous alloy core temperature；
Step S4: secondary temperature elevation；
Step S5: slowly heating and heat preservation；
Step S6: cooling.
Wherein, in heating furnace install amorphous alloy iron core concrete operations are as follows: check connection electrical power control cabinet, furnace body,
Field ionization source control system and nitrogen control system are normally packed into amorphous alloy iron core afterwards.
As shown in figure 4, amorphous alloy iron core point 4 layers of progress shove charge on bracket from top to bottom, every layer is lined up 2 rows, every row
On include 4 amorphous alloy iron cores；Divide 4 layers of arrangement amorphous alloy iron core from top to bottom in heating furnace, efficiently use space,
Improve production efficiency.The amorphous alloy iron core in heating furnace is together in series with copper conductor, series system are as follows: with a copper conductor
With inverted u-shaped, by amorphous alloy that adjacent two arrange, totally 8 amorphous alloy iron cores are first together in series, then by 4 at lowest level
The both ends of copper conductor are together in series, and are attempted by the field ionization source in heating furnace.Series system in this way, when opening field
Power supply, each amorphous alloy iron core can uniformly be magnetized in all directions, can avoid reusing outrigger longitudinal direction and
Transverse magnetic field.
Copper conductor passes through from the center of each amorphous alloy iron core；Copper conductor is connected to field ionization source；Guarantee connecting
After field ionization source, each iron core can be magnetized；Copper conductor must not be contacted with amorphous alloy iron core, bracket and furnace wall, such as be connect
Touching can generate circulating current, burning apparatus.
The insertion temperature test probe in the amorphous alloy iron core for being located at eight vertex；The insertion position of temperature test probe
It is set in the middle part of iron core thickness, insertion depth is the half of amorphous alloy iron core height；Insertion position is insertion in the middle part of iron core thickness
Depth is the half of iron core height, can effectively measure core body temperature, avoids being not allowed because temperature measures, properties of product is caused to reach
Less than requiring.
The concrete operations to heat up for the first time are as follows: the fire door for closing heating furnace is filled with nitrogen into heating furnace, with 1.83 DEG C/min
Speed heat up.
Nitrogen can guarantee that iron core will not be oxidized in entire technical process, and iron core no-load loss is caused to increase； 1.83
DEG C/speed of min heats up, iron core inside and outside temperature can be effectively ensured and uniformly increase；Heating rate is very fast, will lead to iron core
Inside and outside temperature difference is excessive, eventually leads to iron core inside and outside iron core no-load loss and has big difference；Heating rate is slower, will lead to
A large amount of consumption of the energy, cause the waste of resource.
The concrete operations of balanced each amorphous alloy iron core temperature are as follows: detect an amorphous alloy iron core when being warming up to for the first time
Temperature open field ionization source and copper conductor be powered when reaching 220 DEG C, and stop heating and kept the temperature；It is monitored in insulating process
Mutual temperature difference≤5 DEG C of amorphous alloy iron core, soaking time 120min.
The voltage 0.3V of field ionization source, electric current 1300A-1800A；It is the magnetized excitation temperature of iron core when temperature reaches 220 DEG C
Degree, temperature is too low or excessively high will affect iron core magnetic efficiency；Stop heating, furnace body is kept the temperature, monitored iron core is made
Temperature is no more than 5 DEG C each other, and the time must not exceed 120 minutes；Guarantee that each iron core performance is consistent, if temperature difference is excessive,
It is excessive that final products performance difference will be will lead to.
The concrete operations of secondary temperature elevation are as follows: after each amorphous alloy iron core temperature equalization, with the speed of 2.00/min into
Row heating, until detecting that the temperature of an amorphous alloy iron core reaches 330 DEG C.
During secondary temperature elevation, heating rate is fast compared with the speed to heat up for the first time, can speed up core material molecular motion, has
It conducive to magnetized completion, improves efficiency, but the speed to heat up is not easy too fast, once going beyond the scope, then will lead to amorphous alloy
The noise of core increases, and influences performance.
Slowly heating and the concrete operations of incubation step are as follows: when the temperature for detecting an amorphous alloy iron core reaches 330
After DEG C, it will heat up speed and be reduced to 0.33 DEG C/min, the time is 90min~120min；Maximum temperature≤360 DEG C.
After secondary temperature elevation, heating rate is reduced rapidly compared to secondary temperature elevation speed, can be refined using slow heating
Core material molecules align guarantees the suppleness of core material, it is ensured that iron core has preferable anti-short circuit capability, slowly heats up
Speed once goes beyond the scope, then the noise of amorphous alloy iron core can be made to increase；If temperature temperature is more than 360 in insulating process
DEG C, iron core will become hard and brittle, and be unfavorable for later period assembly, and anti-short circuit capability is poor.
The concrete operations of cooling step are as follows: nitrogen is closed, heating furnace door is opened, is cooled down with the speed of 1.3 DEG C/min,
To monitoring all amorphous alloy iron cores temperature≤200 DEG C after, close field ionization source, be further continued for being cooled to room temperature.
When iron core temperature is reduced to 200 DEG C, it is lower than magnetized excitation temperature, core material molecule will not occur again at this time
Change.In temperature-fall period, the speed of cooling be not easy it is too fast, otherwise will lead to amorphous alloy iron core noise increase.
Embodiment 3: the concrete operations to heat up for the first time are as follows: the fire door for closing heating furnace is filled with nitrogen into heating furnace, with
The speed of 1.46 DEG C/min heats up.
Nitrogen can guarantee that iron core will not be oxidized in entire technical process, and iron core no-load loss is caused to increase；With 1.46
DEG C/speed of min heats up, iron core inside and outside temperature can be effectively ensured and uniformly increase；Heating rate is slower, will lead to the energy
A large amount of consumption, cause the waste of resource.
The concrete operations of balanced each amorphous alloy iron core temperature are as follows: detect an amorphous alloy iron core when being warming up to for the first time
Temperature open field ionization source and copper conductor be powered when reaching 220 DEG C, and stop heating and kept the temperature；It is monitored in insulating process
Mutual temperature difference≤5 DEG C of amorphous alloy iron core, soaking time≤120min.
The voltage 0.3V of field ionization source, electric current 1300A-1800A；It is the magnetized excitation temperature of iron core when temperature reaches 220 DEG C
Degree, temperature is too low or excessively high will affect iron core magnetic efficiency；Stop heating, furnace body is kept the temperature, monitored iron core is made
Temperature is no more than 5 DEG C each other, and the time must not exceed 120 minutes；Guarantee that each iron core performance is consistent, if temperature difference is excessive,
It is excessive that final products performance difference will be will lead to.
The concrete operations of secondary temperature elevation are as follows: after each amorphous alloy iron core temperature equalization, with the speed of 1.83 DEG C/min
It heats up, until detecting that the temperature of an amorphous alloy iron core reaches 330 DEG C.
During secondary temperature elevation, heating rate is fast compared with the speed to heat up for the first time, can speed up core material molecular motion, has
It conducive to magnetized completion, improves efficiency, but the speed to heat up is not easy too fast, once going beyond the scope, then will lead to amorphous alloy
The noise of core increases, and influences performance.
Slowly heating and the concrete operations of incubation step are as follows: when the temperature for detecting an amorphous alloy iron core reaches 330
After DEG C, it will heat up speed and be reduced to 0.25 DEG C/min, the time is 90min~120min；Maximum temperature≤360 DEG C.
After secondary temperature elevation, heating rate is reduced rapidly compared to secondary temperature elevation speed, can be refined using slow heating
Core material molecules align guarantees the suppleness of core material, it is ensured that iron core has preferable anti-short circuit capability, slowly heats up
Speed once goes beyond the scope, then the noise of amorphous alloy iron core can be made to increase；If temperature temperature is more than 360 in insulating process
DEG C, iron core will become hard and brittle, and be unfavorable for later period assembly, and anti-short circuit capability is poor.
The concrete operations of cooling step are as follows: cooling step are as follows: close nitrogen, heating furnace door is opened, with the speed of 1.1 DEG C/min
Degree cool down, to monitoring all amorphous alloy iron cores temperature≤200 DEG C after, closing field ionization source, be further continued for being cooled to
Room temperature.
When iron core temperature is reduced to 200 DEG C, it is lower than magnetized excitation temperature, core material molecule will not occur again at this time
Change.In temperature-fall period, the speed of cooling be not easy it is too fast, otherwise will lead to amorphous alloy iron core noise increase.
Detect the no-load loss of amorphous alloy iron core and the concrete operations of exciting power are as follows: detecting electric current as 0.7A, examining
It surveys under conditions of voltage is 39V, testing result: no-load loss≤0.18w/kg when exciting power≤0.30VA/kg, can obtain
To the resistance to shorting amorphous alloy iron core completed to noise reduction, test noise is carried out finally by the condition that analogue transformer operates normally
Performance.
The testing result of embodiment 1-3 and comparative example is as shown in the table.
Although reference be made herein to invention has been described for multiple explanatory embodiments of the invention, however, it is to be understood that
Those skilled in the art can be designed that a lot of other modification and implementations, these modifications and implementations will fall in this Shen
It please be within disclosed scope and spirit.It more specifically, within the scope of the present disclosure and claims, can be to master
The building block and/or layout for inscribing composite configuration carry out a variety of variations and modifications.In addition to what is carried out to building block and/or layout
Outside modification and improvement, to those skilled in the art, other purposes also be will be apparent.
Claims (10)
1. a kind of resistance to shorting amorphous alloy transformer core noise-reduction method, which is characterized in that include following steps:
Step 1: selecting the amorphous alloy monolithic with a thickness of 0.020mm~0.30mm, prepare amorphous alloy iron core；
Step 2: magnetic-field heat treatment is carried out to amorphous alloy iron core；
Step 3: removal amorphous alloy iron core residual stress；
Step 4: detecting the no-load loss and exciting power of amorphous alloy.
2. a kind of resistance to shorting amorphous alloy transformer core noise-reduction method according to claim 1, which is characterized in that described
Step 2 includes following steps:
Step S1: amorphous alloy iron core is installed in heating furnace；
Step S2: first heating；
Step S3: balanced each amorphous alloy iron core temperature；
Step S4: secondary temperature elevation；
Step S5: slowly heating and heat preservation；
Step S6: cooling.
3. a kind of resistance to shorting amorphous alloy transformer core noise-reduction method according to claim 2, which is characterized in that described
In step S1, the mounting means of amorphous alloy iron core in heating furnace are as follows: be divided into N layers of installation from top to bottom；Every layer is equipped with M row
Amorphous alloy iron core；It include L amorphous alloy iron core on every row；Described N, M, L are even number.
4. a kind of resistance to shorting amorphous alloy transformer core noise-reduction method according to claim 3, which is characterized in that described
Step S1 further include: the amorphous alloy iron core in heating furnace is together in series with copper conductor；The copper conductor is from each amorphous
It is passed through at the center of alloy-iron core；The copper conductor is connected to field ionization source.
5. a kind of resistance to shorting amorphous alloy transformer core noise-reduction method according to claim 3, which is characterized in that described
Step S1 further include: the insertion temperature test probe in the amorphous alloy iron core for being located at vertex.
6. a kind of resistance to shorting amorphous alloy transformer core noise-reduction method according to claim 2, which is characterized in that described
The step of heating up for the first time in step S2 are as follows: the fire door for closing heating furnace is filled with nitrogen into heating furnace, with 1.46 DEG C/min~
The speed of 1.83 DEG C/min heats up.
7. a kind of resistance to shorting amorphous alloy transformer core noise-reduction method according to claim 4, it is characterised in that；It is described
In step S3 the step of balanced each amorphous alloy iron core temperature are as follows: when being warming up to the temperature for detecting an amorphous alloy iron core for the first time
It when degree reaches 220 DEG C, opens field ionization source and the copper conductor is powered, and stop heating and kept the temperature；Make to supervise in insulating process
Mutual temperature difference≤5 DEG C of each amorphous alloy iron core surveyed, soaking time≤120min.
8. a kind of resistance to shorting amorphous alloy transformer core noise-reduction method according to claim 2, it is characterised in that: described
In step S4 the step of secondary temperature elevation are as follows: after each amorphous alloy iron core temperature equalization, with 1.83 DEG C/min~2.00/min
Speed heat up, until detect that the temperature of an amorphous alloy iron core reaches 330 DEG C.
9. a kind of resistance to shorting amorphous alloy transformer core noise-reduction method according to claim 2, it is characterised in that: described
The step of slowly heating up and keep the temperature in step S5 are as follows: after the temperature for detecting an amorphous alloy iron core reaches 330 DEG C, will rise
Warm speed is reduced to 0.25 DEG C/min, and the heating-up time is 90min~120min；Maximum temperature≤360 DEG C.
10. a kind of resistance to shorting amorphous alloy transformer core noise-reduction method according to claim 6, it is characterised in that: institute
State the step of cooling down in step S6 are as follows: close nitrogen, open heating furnace door, with the progress of 1.1 DEG C/min~1.3 DEG C/min speed
Cooling, to monitoring all amorphous alloy iron cores temperature≤200 DEG C after, closing field ionization source, be further continued for being cooled to room temperature.
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