CN101788512B - Device and method for measuring heat effect of magnetic material in alternating magnetic field - Google Patents
Device and method for measuring heat effect of magnetic material in alternating magnetic field Download PDFInfo
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- CN101788512B CN101788512B CN2010101124164A CN201010112416A CN101788512B CN 101788512 B CN101788512 B CN 101788512B CN 2010101124164 A CN2010101124164 A CN 2010101124164A CN 201010112416 A CN201010112416 A CN 201010112416A CN 101788512 B CN101788512 B CN 101788512B
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Abstract
The invention relates to a device and a method for measuring heat effect of a magnetic material in an alternating magnetic field, wherein the device comprises an alternating magnetic field generation device, a thermostat and a temperature measuring element, and the method comprises the steps of: putting a sample to be measured in a sample cup filled with measuring medium, regulating the temperature of the measuring medium to a predetermined value, putting the sample cup into a thermostatic chamber, conducting alternating current after heat balance reaches balance, applying the alternating magnetic field, and determining heating power of the sample to be measured by using the temperature measuring element to monitor temperature change of the measuring medium in the sample cup at certain time interval. The measurement device and method have the characteristics of continuously adjustable intensity of the alternating magnetic field, adjustable alternating frequency and measurement temperature of the magnetic field and simple structure, have the advantages of simple and convenient operation, real and reliable measurement data, good repeatability and low running cost, and are significant to the screening of ice-covering-proof magnetic materials.
Description
Technical field
The invention belongs to the thermal effect field of measurement; Particularly a kind of device and method of measuring magnetic material thermal effect in alternating magnetic field; Can measure the thermal effect of magnetic material under the uniform temperature condition, in certain alternation magnetic field, be specially adapted to of the screening of the anti-icing of transmission pressure with magnetic material.
Background technology
The circuit icing is one of disaster of serious threat safe operation of power system.According to incompletely statistics; From in Dec, 1954 to 2006 year end; Various icing disasters take place the electrical network (comprising transmission line of electricity and transformer station) of 6 kilovolts and above electric pressure all over China has more than 1000, wherein 35 kilovolts and more than larger and cause that the icing disaster of electrical network catastrophic failure just has more than 86.Particularly at the beginning of 2008, the most serious freezing disaster since the meteorological record has appearred having in China's south most of areas and east, the Northwest, has caused havoc to electrical network, and direct economic loss is above 60,000,000,000, and indirect loss then reaches more than 300,000,000,000.Therefore, how to prevent that powerline ice-covering from having become an important topic that ensures safe operation of power system.
About the de-icing method of icing circuit, carried out extensive and deep research both at home and abroad, the de-icing method of multiple different mechanisms has successively appearred, and wherein, low curie point magnetic material ice-melting method has caused extensive concern with its excellent characteristic.Through selecting the lower magnetic material of Curie temperature for use, it is coated to the transmission pressure surface.When environment temperature is lower than the Curie temperature of magnetic material; Material is in ferrimagnetic state; Because the effect of alternating magnetic field, because of magnetic hysteresis loss, eddy current loss and residual loss produce thermal effect, this portion of energy loss is the required main energy source of ice-melt in the magnetic material.And when environment temperature was higher, magnetic material was in the paramagnetic attitude, and loss is given birth to heat and significantly reduced, thereby can reduce unnecessary energy loss.
For practical application, prevent mainly paying close attention to two indexs during icing is with the magnetic material process in selection, the one, the Curie temperature of magnetic material, another is the thermal effect of magnetic material in alternating magnetic field.The measurement of Curie temperature can utilize existing equipment to accomplish; Yet; The thermal effect of how to evaluate magnetic material in alternating magnetic field; At present still do not have unified method of testing and ready-made means of testing, therefore, this patent has proposed the measuring method and the device of a kind of magnetic material thermal effect in alternating magnetic field.
Summary of the invention
In order to overcome the defective that to measure magnetic material thermal effect in alternating magnetic field in the prior art; The present invention proposes a kind of device and method of measuring magnetic material thermal effect in alternating magnetic field based on temperature method; Through simulation transmission pressure surface alternating magnetic field and variation of ambient temperature; Measure the thermal value of magnetic material in certain alternation magnetic field, as the index of passing judgment on magnetic material ice-melt ability, with the screening of magnetic material foundation is provided for preventing icing with it.
One of the object of the invention is to provide a kind of device of measuring magnetic material thermal effect in alternating magnetic field; Comprise alternating magnetic field generating means, thermostat and temperature element three parts; Be provided with the sample cup that is used for the splendid attire testing sample in the said thermostat, in the said sample cup measuring media be housed; Said alternating magnetic field generating means is opposite to the logical exchange current of testing sample in the thermostat and applies alternating magnetic field; Said temperature element extend in the thermostat, is used to monitor the temperature variation of measuring media.
1, alternating magnetic field generating means part:
Said alternating magnetic field generating means comprises alternating source, alternating current ammeter, rheostat and solenoid; A leading-out terminal of said alternating source is connected with alternating current ammeter and rheostat, is connected solenoid between another leading-out terminal of said alternating source and the rheostatic leading-out terminal.
Said alternation is surveyed the long hair generating apparatus and is adopted solenoid to carry out the magnetic field loading, specifically is divided into following two kinds:
(1) solenoid adopts long straight solenoid to add loaded magnetic field
The long straight solenoid dimensional parameters is as shown in Figure 1, adopt the enamel covered wire individual layer close around.Solenoid length and diameter ratio (hereinafter to be referred as length-diameter ratio) L/2r greater than 2 situation under, the axial magnetic field in the solenoid is uniformly in the certain limit of central area, can satisfy the measurement demand of difformity and size testing sample.
When adopting long straight solenoid magnetic field load mode; In order to reduce the influence of sample self demagnetizing field; Preferential adopt to have than the cylindrical testing sample of big L/D ratio and its preferably place the core of long straight solenoid axis; The length-diameter ratio L/D of special provision testing sample＞10, and in measuring process, keep the testing sample y direction parallel with the magnetic field of long straight solenoid.
(2) solenoid adopts endless solenoid to add loaded magnetic field
The endless solenoid dimensional parameters is as shown in Figure 2, adopt the enamel covered wire individual layer close around, preferably adopt annular testing sample, endless solenoid is evenly close on annular testing sample.Because annular testing sample magnetic circuit is closed, does not have the influence of demagnetizing field.For guaranteeing that magnetizing field is even along the testing sample radial distribution, the radial thickness that requires annulus is better more than more little with mean diameter, and the radial thickness h of preferred annular testing sample is not more than 1/6 with the ratio of mean diameter.
For above-mentioned two kinds of magnetic field load modes, alternating magnetic field intensity changes along with the change of exchange current intensity in the solenoid, can regulate alternating magnetic field intensity through regulating exchange current intensity, satisfies the needs that thermal effect is measured under the different magnetic field intensity.The frequency that alternating magnetic field changes depends on the frequency of exchange current, can change the magnetic field alternative frequency through changing the exchange current frequency, realizes that the measurement from the power frequency to the high frequency needs.Prevent icing for magnetic material for transmission pressure, the thermal effect under the special concern power frequency alternating magnetic field.
2, thermostat part:
Said thermostat comprises that inside is equipped with the constant temperature enclosure and the circulating device of sample cup, and said circulating device is connected with constant temperature enclosure.Said constant temperature enclosure comprises the main body that heat insulation layer constitutes; Outside at insulating layer is provided with the cooling duct; Said circulating device comprises circulatory mediator case and the ebullator that is loaded with circulatory mediator; Said circulatory mediator case is connected with the cooling duct of constant temperature enclosure through oral siphon and rising pipe, and said oral siphon is provided with ebullator.
In the said constant temperature enclosure sample cup is housed, can controls the temperature in the constant temperature enclosure through the temperature of circulatory mediator in the adjustment circulating device, provide and measure required temperature conditions, the constant temperature scope of constant temperature enclosure can change between 0 ℃ to 50 ℃.
When measuring, the liquid medium that at first specific heat of weighing certain mass is known is put into sample cup, and testing sample integral body is dipped in wherein; Put into constant temperature enclosure then together, treat that thermal equilibrium is stable, reach the requirement temperature after; Can apply alternating magnetic field, measure thermal effect.
The liquid medium that said here specific heat is known can be pure water, absolute ethyl alcohol, kerosene, castor-oil plant wet goods organic or inorganic liquid.
3, temperature element:
This measurement mechanism is mainly measured thermal effect based on the ultimate principle of temperature method; The temperature rising that thermal conductance causes measuring media in the sample cup is given birth in the loss of testing sample in alternating magnetic field; Utilize temperature element to measure the interior at interval temperature variation of certain hour, can confirm the heating power of testing sample material.
Another object of the present invention is to provides the method for measuring magnetic material thermal effect in alternating magnetic field, comprises the steps:
A) testing sample is placed the sample cup that is loaded with measuring media; The temperature of measuring media is adjusted to predetermined value; Put into constant temperature enclosure then, simultaneously, the temperature of circulatory mediator is adjusted to predetermined value (predetermined value equates with predetermined value in " temperature of measuring media is adjusted to predetermined value " noted earlier) here; The ON cycle device, the inside and outside thermal equilibrium of the heat insulation layer of maintenance constant temperature enclosure;
B) treat thermal equilibrium reach stable after, open the logical exchange current of alternating source, solenoid applies alternating magnetic field, with Current Regulation to desired value;
C) utilize temperature element to monitor the temperature variation of measuring media in the at interval interior sample cup of certain hour, confirm the heating power of testing sample with this.
When said solenoid adopted long straight solenoid, the concrete computing method of measuring the testing sample heating power were following:
Testing sample, sample cup and measuring media are looked as a whole, then through type (1) can get thermal effect always and does
Wherein, m
Cup-sample cup quality, the g of unit, c
Cup-sample cup wall material specific heat, the J/g of unit ℃
m
Appearance-sample quality, the g of unit, c
Appearance-sample specific heat, the J/g of unit ℃
m
MediumThe quality of-measuring media, the g of unit, c
MediumThe specific heat of-measuring media, the J/g of unit ℃
T
0-system initial temperature, unit ℃, T-system finishing temperature, unit ℃
t
0-measure the start time, the s of unit, t-measures finish-time, the s of unit
For performance between the different magnetic materials is convenient to comparison, the unified unit mass heating power that adopts of regulation is called for short the substance calorific capacity, and through type (2) gets final product the heating power of testing sample divided by its quality
This is the substance calorific capacity of testing sample in certain alternation magnetic field.
When said solenoid adopted endless solenoid, the concrete computing method of measuring the testing sample heating power were following:
Sample cup, testing sample, toroid winding copper cash and measuring media are looked as a whole, then through type (3) can get thermal effect always and does
Wherein, m
Cup-sample cup quality, the g of unit, c
Cup-sample cup wall material specific heat, the J/g of unit ℃
m
Appearance-sample quality, the g of unit, c
Appearance-sample specific heat, the J/g of unit ℃
m
MediumThe quality of-measuring media, the g of unit, c
MediumThe specific heat of-measuring media, the J/g of unit ℃
m
CopperThe quality of the used copper cash of-toroid winding, g, c
CopperThe specific heat of-copper, the J/g of unit ℃
T
0-system initial temperature, unit ℃, T-system finishing temperature, unit ℃
t
0-measure the start time, the s of unit, t-measures finish-time, the s of unit
Make in (3) formula that the testing sample quality is zero, i.e. m
Appearance=0, the coil thermal effect of then can having leisure computing formula (4)
So the heating power that employing formula (5) obtains testing sample does
P
Appearance=P
Always-P
Coil(W) (5)
For performance between the different magnetic materials is convenient to comparison, the unified unit mass heating power that adopts of regulation is called for short the substance calorific capacity, and employing formula (6) gets final product the heating power of testing sample divided by its quality
This is the substance calorific capacity of testing sample in certain alternation magnetic field.
Said measuring media adopts pure water, absolute ethyl alcohol, kerosene, castor-oil plant wet goods organic or inorganic liquid.
The invention has the beneficial effects as follows: the present invention provides a kind of method and measurement mechanism of simple possible for estimating the anti-icing of transmission pressure with the thermal effect of magnetic material in alternating magnetic field, and it is adjustable continuously that this measurement mechanism and method have alternating magnetic field intensity, and the magnetic field alternative frequency is adjustable; Measure the adjustable and characteristic of simple structure of temperature; Operation is very easy, and measurement data is true and reliable, good reproducibility; Operating cost is low, and this is significant with the screening of magnetic material for anti-icing.
Description of drawings
Fig. 1 is the long straight solenoid structural representation;
Fig. 2 is that annular testing sample and endless solenoid are wrapped in the structural representation on the annular testing sample;
Fig. 3 is proving installation synoptic diagram of the present invention (long straight solenoid extra show);
Fig. 4 is proving installation synoptic diagram of the present invention (endless solenoid extra show);
Wherein, 1-alternating source, 2-alternating current ammeter, 3-rheostat, 4-long straight solenoid; The 5-circulatory mediator, the cylindrical testing sample of 6-, 7-measuring media, 8-sample cup, 9-sample bowl cover; The 10-heat insulation layer, 11-temperature element, 12-circulatory mediator case, 13-ebullator, 14-cooling duct; The 15-oral siphon, 16-rising pipe, 17-endless solenoid, 18-annular testing sample.
Embodiment
Below in conjunction with accompanying drawing measurement mechanism of the present invention and measuring method are done further detailed explanation.
As shown in Figure 3, the testing sample in this example adopts cylindrical testing sample 6, and solenoid adopts long straight solenoid 4.
This routine said measurement mechanism mainly is made up of alternating magnetic field generating means, thermostat and temperature element 11.The alternating magnetic field generation systems comprises AC power 1, alternating current ammeter 2, rheostat 3 and long straight solenoid 4; AC power 1 connects 220V voltage; A leading-out terminal of AC power 1 is connected with alternating current ammeter 2 and rheostat 3 in turn; Be connected with long straight solenoid 4 between another leading-out terminal of alternating source 1 and the leading-out terminal of rheostat 3; Around outside around constant temperature enclosure, alternating current ammeter 2 is used for the current conditions of Real Time Observation device to long straight solenoid uniformly, and rheostat 3 is used for changing the strength of current of circuit; Constant temperature system comprises constant temperature enclosure and circulating device, and constant temperature enclosure comprises the main body that is made up of heat insulation layer 10 (for example isocyanurate foam), and the outside of heat insulation layer is provided with cooling duct 14; Circulating device comprises the circulatory mediator case 12 and ebullator 13 that is loaded with circulatory mediator; Circulatory mediator case 12 is connected through the bottom inlet of oral siphon 15 with cooling duct 14; Circulatory mediator case 12 is connected with the top water delivering orifice of cooling duct 14 through rising pipe 16, and oral siphon 15 is provided with ebullator 13.Cylindrical testing sample 6 places the sample cup 8 that measuring media 7 is housed, and sample cup 8 is provided with sample bowl cover 9 and seals, and then the sample cup integral body of good seal is put into the constant temperature enclosure that is made up of heat insulation layer 10; Temperature element 11 adopts two; One of two temperature elements inserts in sample cup 8 and the cooling duct 14 respectively, the other end is exposed in the air, and two temperature elements are respectively applied for the temperature of circulatory mediator 5 in temperature and the cooling duct of measuring media 7 in the measuring samples cup; Temperature element 11 can adopt microthermometer or temperature sensor and Displaying Meter thereof, and measuring media 7 can adopt pure water, absolute ethyl alcohol, kerosene, castor-oil plant wet goods organic or inorganic liquid, and circulatory mediator 5 can adopt liquid such as water, liquefied ammonia or liquid nitrogen.
The concrete grammar of measuring is:
When measuring; At first the known measuring media 7 of specific heat of weighing certain mass (specifically amount so that testing sample integral body is dipped in wherein be advisable) is put into sample cup 8; And cylindrical testing sample 6 integral body are dipped in wherein; Adjustment measuring media 7 temperature are to predetermined value earlier, and integral body is put into constant temperature enclosure thermal equilibrium then.Meanwhile, the temperature of circulatory mediator 5 is adjusted to predetermined value (predetermined value equates with predetermined value in " temperature of measuring media is adjusted to predetermined value " noted earlier) here, the ON cycle device keeps the heat insulation layer internal and external temperature of constant temperature enclosure balanced.After treating that thermal equilibrium reaches steady state (SS), open AC power 1, long straight solenoid 4 produces alternating magnetic field, and the alternating magnetic field requirement of strength that applies as required arrives desired value with Current Regulation.The temperature rising that thermal conductance causes measuring media in the sample cup 8 is given birth in the loss of testing sample 6 in alternating magnetic field, utilizes temperature element 11 to measure the interior at interval temperature variation of certain hours, can confirm the heating power of testing sample 6.
Because long straight solenoid 4 places constant temperature enclosure outside, long straight solenoid 4 self-heatings are recycled medium and take away, and therefore, the temperature variation in the sample cup is only given birth to heat by the sample own loss and caused that measured value is the actual heating power of sample, and concrete computing method are following:
Testing sample, sample cup and measuring media are looked as a whole, then through type (1) can get thermal effect always and does
Wherein, m
Cup-sample cup quality, the g of unit, c
Cup-sample cup wall material specific heat, the J/g of unit ℃
m
Appearance-sample quality, the g of unit, c
Appearance-sample specific heat, the J/g of unit ℃
m
MediumThe quality of-measuring media, the g of unit, c
MediumThe specific heat of-measuring media, the J/g of unit ℃
T
0-system initial temperature, unit ℃, T-system finishing temperature, unit ℃
t
0-measure the start time, the s of unit, t-measures finish-time, the s of unit
For performance between the different magnetic materials is convenient to comparison, the unified unit mass heating power that adopts of regulation is called for short the substance calorific capacity, and through type (2) gets final product the heating power of testing sample divided by its quality
This is the substance calorific capacity of testing sample in certain alternation magnetic field.
As shown in Figure 4, the testing sample in this example adopts annular testing sample 18, and solenoid adopts endless solenoid 17.
This routine said measurement mechanism mainly is made up of alternating magnetic field generating means, thermostat and temperature element 11.The alternating magnetic field generation systems comprises AC power 1, alternating current ammeter 2, rheostat 3 and endless solenoid 17; AC power 1 connects 220V voltage; 1 one leading-out terminals of AC power are connected with alternating current ammeter 2 and rheostat 3 in turn; The two ends of the endless solenoid 17 on annular testing sample 18 skins link to each other with another leading-out terminal of alternating source 1 and the leading-out terminal of rheostat 3 respectively; Alternating current ammeter 2 is used for the current conditions of Real Time Observation device, and rheostat 3 is used for changing the strength of current of circuit; Constant temperature system comprises constant temperature enclosure and circulating device, and constant temperature enclosure comprises the main body that is made up of heat insulation layer 10 (for example isocyanurate foam), and the outside of heat insulation layer is provided with cooling duct 14; Circulating device comprises the circulatory mediator case 12 and ebullator 13 that is loaded with circulatory mediator; Circulatory mediator case 12 is connected through the bottom inlet of oral siphon 15 with cooling duct 14; Circulatory mediator case 12 is connected with the top water delivering orifice of cooling duct 14 through rising pipe 16, and oral siphon 15 is provided with ebullator 13.The annular testing sample 18 that is wound with endless solenoid 17 places the sample cup 8 that measuring media 7 is housed, and sample cup 8 is provided with sample bowl cover 9 and seals, and then the sample cup integral body of good seal is put into the constant temperature enclosure that is made up of heat insulation layer 10; Temperature element 11 adopts two; One of two temperature elements inserts in sample cup 8 and the cooling duct 14 respectively, the other end is exposed in the air, and two temperature elements are respectively applied for the temperature of circulatory mediator 5 in temperature and the cooling duct of measuring media 7 in the measuring samples cup; Temperature element 11 can adopt microthermometer or temperature sensor and Displaying Meter thereof, and measuring media 7 can adopt pure water, absolute ethyl alcohol, kerosene, castor-oil plant wet goods organic or inorganic liquid, and circulatory mediator 5 can adopt liquid such as water, liquefied ammonia or liquid nitrogen.
The concrete grammar of measuring is:
When measuring, at first the known measuring media 7 of specific heat of weighing certain mass (specifically amount so that testing sample integral body is dipped in wherein be advisable) is put into sample cup 8, and adjustment measuring media 7 temperature are to predetermined value earlier, and integral body is put into constant temperature enclosure thermal equilibrium then.Meanwhile, the temperature of circulatory mediator 5 is adjusted to predetermined value (predetermined value equates with predetermined value in " temperature of measuring media is adjusted to predetermined value " noted earlier) here, the ON cycle device keeps the heat insulation layer internal and external temperature of constant temperature enclosure balanced.After treating that thermal equilibrium reaches steady state (SS), open AC power 1, endless solenoid 17 produces alternating magnetic field, and the alternating magnetic field requirement of strength standardsizing rheostat that applies as required is adjusted to desired value with strength of current.Because loss is given birth to hot, the temperature of measuring media rises in the sample cup 8, utilizes temperature element 11 to measure the interior at interval temperature variation of certain hour.
Load magnetic approach for endless solenoid 17, the temperature variation that is monitored is generated heat by testing sample loss heating and solenoid loss and is caused jointly, i.e. P
Always=P
Appearance+ P
SolenoidTherefore, when the thermal effect of calculation sample, must deduct the influence of solenoid self-heating.During concrete operations, can adopt the ceases to be busy circle that has the same size size with testing sample, measure its heating power under same test condition, in total heating power, its deduction got final product then, concrete computing method are following:
Sample cup, testing sample, toroid winding copper cash and measuring media are looked as a whole, then through type (3) can get thermal effect always and does
Wherein, m
Cup-sample cup quality, the g of unit, c
Cup-sample cup wall material specific heat, the J/g of unit ℃
m
Appearance-sample quality, the g of unit, c
Appearance-sample specific heat, the J/g of unit ℃
m
MediumThe quality of-measuring media, the g of unit, c
MediumThe specific heat of-measuring media, the J/g of unit ℃
m
CopperThe quality of the used copper cash of-toroid winding, g, c
CopperThe specific heat of-copper, the J/g of unit ℃
T
0-system initial temperature, unit ℃, T-system finishing temperature, unit ℃
t
0-measure the start time, the s of unit, t-measures finish-time, and the s of unit makes that the testing sample quality is zero in (3) formula, i.e. m
Appearance=0, the coil thermal effect of then can having leisure computing formula (4)
So the heating power that employing formula (5) obtains testing sample does
P
Appearance=P
Always-P
Coil(W) (5)
For performance between the different magnetic materials is convenient to comparison, the unified unit mass heating power that adopts of regulation is called for short the substance calorific capacity, and employing formula (6) gets final product the heating power of testing sample divided by its quality
This is the substance calorific capacity of testing sample in certain alternation magnetic field.
Should be noted that at last: above embodiment is only in order to technical scheme of the present invention to be described but not to its restriction; Although the present invention has been carried out detailed explanation with reference to the foregoing description; Under the those of ordinary skill in field be to be understood that: still can specific embodiments of the invention make amendment or be equal to replacement; And do not break away from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (10)
1. device of measuring magnetic material thermal effect in alternating magnetic field; It is characterized in that: this device comprises alternating magnetic field generating means, thermostat and temperature element; Be provided with the sample cup that is used for the splendid attire testing sample in the said thermostat, in the said sample cup measuring media be housed; The testing sample that said alternating magnetic field generating means is opposite in the thermostat applies alternating magnetic field; Said temperature element extend in the sample cup in the thermostat, is used to monitor the temperature variation of measuring media;
Said thermostat comprises that inside is equipped with the constant temperature enclosure and the circulating device of sample cup, and said circulating device is connected with constant temperature enclosure;
Said constant temperature enclosure comprises the main body that heat insulation layer constitutes; Outside at insulating layer is provided with the cooling duct; Said circulating device comprises circulatory mediator case and the ebullator that is loaded with circulatory mediator; Said circulatory mediator case is connected with the cooling duct of constant temperature enclosure through oral siphon and rising pipe, and said oral siphon is provided with ebullator.
2. measurement mechanism as claimed in claim 1; It is characterized in that: said alternating magnetic field generating means comprises alternating source, alternating current ammeter, rheostat and solenoid; A leading-out terminal of said alternating source is connected with alternating current ammeter and rheostat, is connected solenoid between another leading-out terminal of said alternating source and the rheostatic leading-out terminal.
3. measurement mechanism as claimed in claim 2; It is characterized in that: when said solenoid is long straight solenoid; Said testing sample is cylindrical, and cylindrical testing sample places the centre of long straight solenoid axis and its y direction parallel with the magnetic field of long straight solenoid.
4. measurement mechanism as claimed in claim 3 is characterized in that: the length-to-diameter of said long straight solenoid is greater than 2, and the length-to-diameter of said cylindrical testing sample is greater than 10.
5. measurement mechanism as claimed in claim 2 is characterized in that: when said solenoid is an endless solenoid, said testing sample is an annular, and endless solenoid is evenly close on annular testing sample.
6. measurement mechanism as claimed in claim 5 is characterized in that: the radial thickness of said annular testing sample is not more than 1/6 with the ratio of mean diameter.
7. the method with the described measurement device magnetic material of claim 1 thermal effect in alternating magnetic field is characterized in that: comprise the steps:
A) testing sample is placed the sample cup that is loaded with measuring media, the temperature of measuring media is adjusted to predetermined value, put into constant temperature enclosure then; Simultaneously; The temperature of circulatory mediator is adjusted to predetermined value, ON cycle device, the inside and outside thermal equilibrium of the heat insulation layer of maintenance constant temperature enclosure;
B) treat thermal equilibrium reach stable after, open the logical exchange current of alternating source, solenoid applies alternating magnetic field, with Current Regulation to desired value;
C) utilize temperature element to monitor the temperature variation of measuring media in the at interval interior sample cup of certain hour, confirm the heating power of testing sample with this.
8. measuring method as claimed in claim 7 is characterized in that: when said solenoid adopted long straight solenoid, the concrete computing method of measuring the testing sample heating power were following:
Testing sample, sample cup and measuring media are looked as a whole, then through type (1) can get thermal effect always and does
Wherein, m
Cup-sample cup quality, the g of unit, c
Cup-sample cup wall material specific heat, the J/g of unit ℃
m
Appearance-sample quality, the g of unit, c
Appearance-sample specific heat, the J/g of unit ℃
m
MediumThe quality of-measuring media, the g of unit, c
MediumThe specific heat of-measuring media, the J/g of unit ℃
T
0-system initial temperature, unit ℃, T-system finishing temperature, unit ℃
t
0-measure the start time, the s of unit, t-measures finish-time, the s of unit
For performance between the different magnetic materials is convenient to comparison, the unified unit mass heating power that adopts of regulation is called for short the substance calorific capacity, and through type (2) gets final product the heating power of testing sample divided by its quality
This is the substance calorific capacity of testing sample in certain alternation magnetic field.
9. measuring method as claimed in claim 7 is characterized in that: when said solenoid adopted endless solenoid, the concrete computing method of measuring the testing sample heating power were following:
Sample cup, testing sample, toroid winding copper cash and measuring media are looked as a whole, then through type (3) can get thermal effect always and does
Wherein, m
Cup-sample cup quality, the g of unit, c
Cup-sample cup wall material specific heat, the J/g of unit ℃
m
Appearance-sample quality, the g of unit, c
Appearance-sample specific heat, the J/g of unit ℃
m
MediumThe quality of-measuring media, the g of unit, c
MediumThe specific heat of-measuring media, the J/g of unit ℃
m
CopperThe quality of the used copper cash of-toroid winding, g, c
CopperThe specific heat of-copper, the J/g of unit ℃
T
0-system initial temperature, unit ℃, T-system finishing temperature, unit ℃
t
0-measure the start time, the s of unit, t-measures finish-time, the s of unit
Make in (3) formula that the testing sample quality is zero, i.e. m
Appearance=0, the coil thermal effect of then can having leisure computing formula (4)
So the heating power that employing formula (5) obtains testing sample does
P
Appearance=P
Always-P
Coil(W) (5)
For performance between the different magnetic materials is convenient to comparison, the unified unit mass heating power that adopts of regulation is called for short the substance calorific capacity, and employing formula (6) gets final product the heating power of testing sample divided by its quality
This is the substance calorific capacity of testing sample in certain alternation magnetic field.
10. measuring method as claimed in claim 7 is characterized in that: said measuring media adopts organic or inorganic liquid, and said organic or inorganic liquid is pure water, absolute ethyl alcohol, kerosene or castor oil.
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| CN106442619B (en) * | 2016-10-31 | 2023-03-21 | 华南理工大学 | Double-channel room-temperature magnetocaloric effect direct measuring instrument and method |
| CN108267700A (en) * | 2017-01-04 | 2018-07-10 | 天津三环乐喜新材料有限公司 | A kind of detecting system and its detection method of the anti-demagnetization capability of permanent magnet |
| CN110940850A (en) * | 2019-12-13 | 2020-03-31 | 永固集团股份有限公司 | On-line monitoring method and system for electric power fitting power and storage medium |
| CN112684388B (en) * | 2020-12-10 | 2021-10-15 | 大连理工大学 | Method for measuring medium-high frequency alternating magnetic field intensity based on eddy current effect |
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