CN210323331U - Magnetic material characteristic tester - Google Patents
Magnetic material characteristic tester Download PDFInfo
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- CN210323331U CN210323331U CN201920577534.9U CN201920577534U CN210323331U CN 210323331 U CN210323331 U CN 210323331U CN 201920577534 U CN201920577534 U CN 201920577534U CN 210323331 U CN210323331 U CN 210323331U
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Abstract
The utility model discloses a magnetic material characteristic tester, which comprises a heating device, a temperature controller, a heating current controller, a sinusoidal signal generator, an alternating voltage meter and an oscilloscope; an excitation wire and an induction wire are arranged in the heating device; one end of the excitation wire is connected with the sine signal generator, and the other end of the excitation wire is connected with an X-axis input port of the oscilloscope; one end of the induction line is grounded and is connected with the other end of the induction line through a capacitor, and the other end of the induction line is connected with a Y-axis input port of the oscilloscope through an amplifier. According to the tester provided by the utility model, the temperature detected by the temperature sensor is the temperature of the sample to be tested in the flat-head pipe, so as to ensure the accuracy of the temperature detection of the sample and eliminate the problem of temperature control hysteresis of the traditional radiant heating furnace; meanwhile, the magnetization curves of the magnetic materials at different temperatures and the change relation of the magnetic hysteresis loop with the frequency and the amplitude under different temperature conditions are realized; in addition, the Curie point of the magnetic material can be accurately measured.
Description
Technical Field
The utility model relates to a tester especially relates to a magnetic material characteristic test appearance, belongs to the experimental apparatus field.
Background
The ferromagnetic substance has strong magnetism after being magnetized, but the strong magnetism is related to temperature, and the ordered arrangement of magnetic domains can be influenced along with the temperature rise of the ferromagnetic substance and the thermal motion of the metal lattice. However, without reaching a certain temperature, the thermal motion is not sufficient to destroy the parallel alignment of the magnetic domains, at which point the average magnetic moment of any macroscopic region is still not zero, the substance is still magnetic, but the average magnetic moment decreases with increasing temperature. When the temperature reaches a certain value, due to the violent thermal motion of molecules, the magnetic domain is collapsed, the average magnetic moment is reduced to zero, the magnetism of the ferromagnetic substance is disappeared and converted into paramagnetic substance, a series of ferromagnetic properties (such as high magnetic conductivity, magnetostriction and the like) associated with the magnetic domain are completely disappeared, the hysteresis loop disappears and becomes a straight line, and the magnetic conductivity of the corresponding ferromagnetic substance is converted into the magnetic conductivity of the paramagnetic substance. The temperature corresponding to the disappearance of ferromagnetism is the curie temperature.
The traditional magnetic material Curie point is designed by adopting a radiation type heating furnace, namely, a magnetic ring sample to be measured is wound with excitation and induction lines and then is placed in an air tank of the radiation type heating furnace, and the temperature of the air tank is measured by a temperature sensor AD590 or other sensors additionally placed at the accessories of the sample to be measured. Because the thermal conductivity of the air is low, the temperature uniformity in the air furnace is poor, and because the thermal conductivity of the sample is different from that of the temperature sensor, the accuracy and repeatability of actual measured data are poor; in addition, because the air heat conductivity coefficient is low, the temperature control hysteresis is high, the balance fluctuation time of a certain temperature point is long, and the point-to-point test cannot be carried out.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems, the utility model aims to provide a magnetic material characteristic tester, a flat head pipe and a temperature sensor are equidistantly arranged at the left end and the right end of a heating rod, the temperature detected by the temperature sensor is the temperature of a sample to be tested in the flat head pipe, so as to ensure the accuracy of the temperature detection of the sample and eliminate the problem of temperature control hysteresis of the traditional radiant heating furnace; meanwhile, the magnetization curve of the magnetic material at different temperatures can be tested; testing the change relation of the hysteresis loop along with the frequency and the amplitude under different temperature conditions; in addition, the Curie point of the magnetic material can be accurately measured.
In order to realize the above purpose, the utility model discloses a technical scheme:
a magnetic material characteristic tester comprises a heating device, a temperature controller, a heating current controller, a sinusoidal signal generator, an alternating current voltmeter and an oscilloscope;
an excitation wire and an induction wire are arranged in the heating device; one end of the excitation wire is connected with the sinusoidal signal generator, and the other end of the excitation wire is connected with an X-axis input port of the oscilloscope; one end of the induction line is grounded, and the other end of the induction line is connected with a Y-axis input port of the oscilloscope through an amplifier; the front end of the amplifier is connected with the grounding end of the induction line through a capacitor;
the temperature controller and the heating current controller are both connected with a heating circuit in the heating device, the alternating current voltmeter is connected with an alternating current-direct current converter, and the alternating current-direct current converter is connected with the output end of the amplifier;
a flat head pipe, a heating furnace core, a heating rod and a temperature sensor are arranged in the heating device, and the heating rod is vertically inserted into the lower part of the heating furnace core; the flat-head pipe and the temperature sensor are vertically inserted into the upper part of the heating furnace core and are respectively arranged at the left end and the right end of the heating rod at equal intervals.
In the utility model, the heating device is used for heating the sample to be tested and providing the testing temperature; the temperature controller is used for controlling the on-off of the heating current so as to control the heating temperature; the heating current controller is used for controlling the magnitude of the heating current so as to control the heating rate; the sinusoidal signal generator is used for providing sinusoidal signals with different frequencies and amplitudes; the alternating-current voltmeter is used for measuring the induced electromotive force of the sample to be measured, so that the Curie point can be accurately measured when the oscillograph is used for observing a hysteresis loop of the magnetic material changing along with the temperature; the oscilloscope is used for measuring the waveform of the excitation signal and the waveform of the induced electromotive force.
The utility model discloses in, both ends about the heating rod are controlled in flat head pipe and the setting of temperature sensor equidistance, and the temperature that temperature sensor detected is the temperature of the intraductal sample that awaits measuring of flat head promptly to guarantee the accuracy that sample temperature detected, eliminated traditional radiant heating furnace control by temperature change hysteresis quality problem.
Further, the device also comprises a first resistor R1A second resistor R2And a sliding rheostat R3(ii) a The first resistor R1Are connected in series at the opposite ends of the induction line grounding end; the second resistor R2And a sliding rheostat R3Parallel connection, after parallel connection, one end is connected with the excitation wire, and the other end is grounded; the slide rheostat R3The sliding end of the oscilloscope is connected with an X-axis input port of the oscilloscope.
The utility model discloses in, first resistance R1The inductive electromotive force on the induction line is amplified by the integrating circuit and then is sent to the Y-axis input end of the oscilloscope; a second resistor R2For sampling the resistance, by adjusting the slide rheostat R3The size of the total parallel sampling resistor can be changed, the size of the exciting current can be changed, and the magnetic field intensity in the sample can be further changed.
The utility model discloses in, the ferromagnetism of sample is observed in two kinds of ways of accessible disappears, comes accurate test curie point.
(1) And judging whether the hysteresis loop of the sample disappears or not.
The ferromagnetic substance is characterized in that when it is magnetized by an external magnetic field, the relationship between the magnetic induction B and the magnetic field H is non-linear and not singular, and the magnetization condition is related to the previous magnetization history, i.e. the B-H curve is a closed curve called a hysteresis loop, as shown in fig. 6. When the ferromagnetism disappears, the corresponding hysteresis loop disappears (becomes a straight line). Therefore, the temperature corresponding to when the hysteresis loop disappears is measured as the curie temperature.
In order to obtain a hysteresis loop of the sample, a second resistor R for sampling can be connected in series with the excitation coil loop2. Since the magnetic field strength H in the sample is proportional to the current I passing through the excitation coil, the second resistor R2The voltage U across is also proportional to the current I, so the magnetic field strength H can be represented by U, which is fed into the X-axis of the oscilloscope.
Induced electromotive force is generated in the induction coil on the sample, known by the Faraday's law of electromagnetic induction,
the magnitude of the induced electromotive force is:
where k is a proportionality coefficient related to the number of turns and the cross-sectional area of the coil. Integrating formula 1 to obtain:
it can be seen that the magnetic induction B of the sample is proportional to the integral of the induced electromotive force on the induction coil. Thus, the electromotive force induced in the induction coil is passed through R1The C integrating circuit integrates and amplifies the signal and sends the signal to the Y axis of the oscilloscope, thus the magnetic hysteresis loop of the sample can be observed on the oscilloscope (the oscilloscope uses the X-Y working mode).
(2) By determining the curve of the magnetic induction as a function of temperature
General spontaneous magnetization MS(the average magnetic moment of any region) is called the spontaneous magnetization, and is very close to the saturation magnetization M (the magnetization when it does not change with an external magnetic field), and the spontaneous magnetization can be approximately replaced by the saturation magnetization, and the saturation magnetization can be based on the magnetic fieldThe Curie temperature is judged by changing the strength characteristic with the temperature. The experimental tester cannot directly measure M, but the electromagnetic theory knows that when the temperature of a ferromagnetic substance reaches Curie temperature, the change curve of M (T) is very similar to the curve of B (T), so that the Curie temperature can be deduced by measuring the curve of B (T) under the condition of low measurement precision requirement. That is, a curve of the induced potential varying with the temperature T is measured, and a tangent line is drawn at a position where the slope thereof is maximum, and an intersection point of the tangent line and an abscissa (temperature) is the curie temperature of the sample, as shown in fig. 7.
Further, the heating device comprises a sensing assembly and a heating assembly, wherein the sensing assembly is arranged at the upper end of the heating assembly; the sensing assembly is used for transferring heat and heating a sample to be detected in the sensing assembly.
The sensing assembly comprises a heat insulation sleeve, a flat head pipe, a sample testing cable and a sample placing part; the flat-head pipe is arranged at the lower end of the heat insulation sleeve, and a filler is filled in the flat-head pipe; the sample test cable penetrates through the heat insulation sleeve, the excitation wire and the induction wire are wound in the sample placing part, the output ends of the excitation wire and the induction wire are connected with the sample test cable, and the sample placing part is located at the bottom end of the plain-end pipe.
In the utility model, the heat insulation sleeve is used for heat insulation; the flat-head tube is used for isolating a sample to be detected from the heating device and simultaneously carrying out good heat transfer; the sample test cable is used for connecting external electrical elements; the sample placing part is used for placing a sample to be tested. The filler is filled in the flat-head tube and used for conducting heat, and the temperature of the sample to be measured is ensured to be consistent with the temperature of the heating furnace core in the heating assembly.
The heating assembly comprises an upper cover, a heating furnace core, a lower cover, a heating rod and a temperature sensor; the upper cover, the heating furnace core and the lower cover are sequentially arranged from top to bottom; the heating rod penetrates through the lower cover and is vertically inserted into the heating furnace core; the flat head pipe and the temperature sensor both penetrate through the upper cover and are vertically inserted into the heating furnace core; the heating rod is connected with the heating current controller, and the temperature sensor is connected with the temperature controller.
In the utility model, the upper cover is used for fixing the whole heating device and insulating heat; the heating furnace core is used for heating a sample to be measured; the lower cover is used for fixing the heating rod and the heating furnace core; the heating rod is internally provided with heating current for heating; the temperature sensor is used for detecting the temperature in the heating furnace core.
Furthermore, the sensing assembly further comprises a set screw, a screw hole communicated with the inner end is formed in the side wall of the heat insulation sleeve, and the set screw is inserted into the screw hole so as to fix the sample test cable in the heat insulation sleeve and prevent the sample test cable from moving up and down.
Furthermore, the flat-head tube is of a structure with an opening at the upper end and a closed lower end, the filler is magnesium oxide powder, the heat conductivity coefficient is good, and the temperature of the sample is ensured to be consistent with that of the heating furnace core; heat-conducting silicone grease is coated between the heating furnace core and the heating rod so as to facilitate heat conduction; the upper end of the flat head pipe is bonded to the lower end of the heat insulation sleeve through high-temperature-resistant glue.
Furthermore, a temperature switch is arranged on the side wall of the outer end of the heating furnace core and connected with the heating current controller. The utility model discloses in, temperature switch detects heating element's temperature, if temperature sensor or temperature controller cause the temperature uncontrollable when damaging, and when heating device high temperature, temperature switch can directly cut off heating power supply, plays the guard action.
Further, the material of heat insulating sleeve is black POM plastics, the material of frustum pipe is stainless steel, the material of upper cover is polytetrafluoroethylene, the material of heating furnace core is copper, the material of lower cover is phenolic aldehyde, the heating rod is nichrome heating pipe.
Further, the temperature sensor is a PT100 platinum resistance temperature sensor, and the temperature controller is a PID temperature controller. In the utility model, because the sample to be measured and the PT100 platinum resistance temperature sensor have good heat conductivity coefficient with the heating furnace core of the copper block, the temperature of the sample to be measured is the temperature indicated by the PT100 platinum resistance temperature sensor; by adopting a PID temperature controller, the temperature control resolution reaches 0.1 ℃, the accuracy of temperature measurement and temperature control is ensured, a closed-loop temperature control system can be constructed, and the measurement of the magnetic characteristics of samples to be measured at different temperature points is realized, namely, point-to-point test is carried out, such as the temperature characteristics of the samples to be measured at a certain temperature point of 30 ℃, 50 ℃ or 60 ℃.
Further, a heat radiation fan is arranged at the outer end of the heating device. The heat radiation fan can discharge hot air of the heating device after being electrified, so that heat is radiated to the heating part, the heating device has a heat radiation function, an experiment can be continuously carried out, and the problem of low natural heat radiation efficiency is solved.
Further, the multifunctional desk lamp further comprises an operation panel, and an operation key and an indicator lamp are arranged on the operation panel. In the utility model, the operation keys comprise a heating opening control switch, a heat dissipation control switch, a heating current adjusting key, a sine wave signal output frequency adjusting key, a sine wave signal output amplitude adjusting key and the like; the indicator lamps comprise heating indicator lamps, heat dissipation indicator lamps and the like; a series of operation keys and indicator lamps are arranged, so that an experimenter can conveniently operate the tester.
The utility model has the advantages that:
the utility model provides a magnetic material characteristic tester, which adopts an alternating current voltmeter to measure the induced electromotive force of a sample to be tested, so that when an oscilloscope is used to observe a hysteresis loop of a magnetic material changing along with temperature, the Curie point is accurately measured; the temperature controller can control the temperature of the heating device, so that the tester can research the magnetization curves of the magnetic materials at different temperatures; the frequency and amplitude output by the sine signal generator are continuously adjustable, and the magnetic material hysteresis loop can be used for researching the change relation of the magnetic material hysteresis loop along with the frequency and the amplitude under different temperature conditions.
The utility model provides a magnetic material characteristic tester, heating device in the tester, flat head pipe and temperature sensor equidistance set up both ends about the heating rod, and the temperature that temperature sensor detected is the temperature of the intraductal sample that awaits measuring of flat head promptly to guarantee the accuracy that sample temperature detected, eliminated traditional radiant heating furnace control by temperature change hysteresis quality problem, improved curie point measuring accuracy.
Drawings
FIG. 1 is a schematic view of the present invention;
fig. 2 is a schematic view of the heating device of the present invention;
fig. 3 is a cross-sectional view of the sensing assembly of the present invention;
fig. 4 is a cross-sectional view of the heating assembly of the present invention;
fig. 5 is a cross-sectional view of the heating device of the present invention;
FIG. 6 is a schematic diagram of a hysteresis loop;
FIG. 7 is a graph of induced electromotive force versus temperature;
in the figure: 1. a heating device; 11. an excitation wire; 12. an induction line; 13. a capacitor; 14. an amplifier; 15. an AC-DC converter; 16. a first resistor R1(ii) a 17. A second resistor R2(ii) a 18. Sliding rheostat R3(ii) a 110. A sensing component; 111. a heat insulating sleeve; 112. a plain end tube; 113. a sample test cable; 114. a sample placement section; 115. tightening the screw; 120. a heating assembly; 121. an upper cover; 122. heating the furnace core; 123. a lower cover; 124. a heating rod; 125. a temperature sensor; 126. a temperature switch; 2. a temperature controller; 3. a heating current controller; 4. a sinusoidal signal generator; 5. an alternating current voltmeter; 6. an oscilloscope.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be further explained with reference to the accompanying drawings. In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
A magnetic material characteristic tester is shown in figures 1-5 and comprises a heating device 1, a temperature controller 2, a heating current controller 3, a sine signal generator 4, an alternating voltage meter 5 and an oscilloscope 6;
a driving wire 11 and an induction wire 12 are arranged in the heating device 1; one end of an excitation wire 11 is connected with the sine signal generator 4, and the other end of the excitation wire is connected with an X-axis input port of the oscilloscope 6; one end of the induction wire 12 is grounded, and the other end is connected with a Y-axis input port of the oscilloscope 6 through an amplifier 14; the front end of the amplifier 14 is connected with the grounding end of the induction line 12 through the capacitor 13; the excitation coil 11 is a sample after being wound, and the induction coil 12 is an induction coil after being wound.
The temperature controller 2 and the heating current controller 3 are both connected with a heating circuit in the heating device 1, the alternating current voltmeter 5 is connected with an alternating current-direct current converter 15, and the alternating current-direct current converter 15 is connected with the output end of the amplifier 14;
the heating device 1 is internally provided with a flat head pipe 112, a heating furnace core 122, a heating rod 124 and a temperature sensor 125, wherein the heating rod 124 is vertically inserted into the lower part of the heating furnace core 122; the flat head tube 112 and the temperature sensor 125 are vertically inserted into the upper portion of the heating furnace core 122 and are respectively disposed at the left and right ends of the heating rod 124 at equal intervals.
In this embodiment, the temperature controller 2 is an XMTF818 temperature controller; the heating current controller 3 adopts a heating current controller of OP07 and a matching circuit; the sine signal generator 4 is an ICL8038CCPD model sine signal generator; the alternating-current voltmeter 5 is a three-position and half-2V alternating-current voltmeter; the oscilloscope 6 is a common laboratory 20MHz analog oscilloscope or a digital oscilloscope; the amplifier 14 is a TL082 type amplifier; the AC-DC converter 15 is an AD637JD type AC-DC converter; the heating circuit is a conventional heating circuit.
As the optimization scheme of the utility model, still include first resistance R 116. A second resistor R 217 and sliding rheostat R 318；
A first resistor R 116 are connected in series at opposite ends of the ground of the sensing line 12; a second resistor R 217 and sliding rheostat R 318 are connected in parallel, one end of the parallel connection is connected with the excitation wire 11, and the other end is grounded; sliding rheostat R3The sliding end of 18 is connected with the X-axis input port of the oscilloscope 6.
As an optimized scheme of the present invention, the heating device 1 includes a sensing component 110 and a heating component 120, the sensing component 110 is installed at the upper end of the heating component 120;
the sensing assembly 110 includes an insulating sleeve 111, a flattened tube 112, a sample testing cable 113, and a sample placement portion 114; a flat head pipe 112 is arranged at the lower end of the heat insulation sleeve 111, and the filler is filled in the flat head pipe 112; the sample test cable 113 passes through the heat insulation sleeve 111, the excitation wire 11 and the induction wire 12 are wound in the sample placing part 114, the output ends of the excitation wire 11 and the induction wire 12 are both connected with the sample test cable 113, and the sample placing part 114 is positioned at the bottom end of the flat-head pipe 112;
the heating assembly 120 includes an upper cover 121, a heating furnace core 122, a lower cover 123, a heating rod 124 and a temperature sensor 125; the upper cover 121, the heating furnace core 122 and the lower cover 123 are arranged from top to bottom in sequence; the heating rod 124 is vertically inserted into the heating core 122 through the lower cap 123; the flat head pipe 112 and the temperature sensor 125 both penetrate through the upper cover 121 and are vertically inserted into the heating furnace core 122; the heating rod 124 is connected to the heating current controller 3, and the temperature sensor 125 is connected to the temperature controller 2.
As the utility model discloses an optimization scheme, sensing component 110 still includes holding screw 115, is equipped with the inner screw hole of intercommunication on the lateral wall of radiation shield 111, and holding screw 115 inserts in the screw hole.
As an optimized scheme of the utility model, the plain end pipe 112 is a structure with an opening at the upper end and a closed lower end, and the filling agent is magnesia powder; heat-conducting silicone grease is coated between the heating furnace core 122 and the heating rod 124; the upper end of the flat pipe 112 is bonded to the lower end of the heat insulation sleeve 111 through high temperature resistant glue.
As the optimization scheme of the utility model, the side wall of the outer end of the heating furnace core 122 is provided with the temperature switch 126, and the temperature switch 126 is connected with the heating current controller 3. In this embodiment, the temperature switch 126 is a JUC-31F temperature switch, and is normally closed at 115 ℃.
As the optimization scheme of the utility model, the material of radiation shield 111 is black POM plastics, and the material of plain end pipe 112 is 304 stainless steel, and the material of upper cover 121 is polytetrafluoroethylene, and the material of heating furnace core 122 is copper, and the material of lower cover 123 is phenolic aldehyde, and heating rod 124 is the nichrome heating pipe.
As the optimization scheme of the utility model, temperature sensor 125 is PT100 platinum resistance temperature sensor, and temperature controller 2 is PID temperature controller.
As the optimization scheme of the utility model, 1 outer end of heating device is provided with radiator fan.
As the utility model discloses an optimization scheme still includes operating panel, last operation button and the pilot lamp of being provided with of operating panel.
For better understanding of the present invention, the following description is made for the present invention in a complete description:
placing a sample to be tested: firstly, winding a to-be-detected circular ring sample with a driving wire 11 and a sensing wire 12, then placing the circular ring sample in a plain end tube 112 filled with magnesia powder (namely a sample placing part 114 in the figure), and then exposing the leading-out ends of four output wires of the driving wire 11 and the sensing wire 12 outside the upper port of the plain end tube 112; secondly, gluing the upper port of the plain end pipe 112 to avoid the leakage of the filled magnesia powder; then, a four-core cable (a sample test cable 113 in the figure) is inserted into the heat insulation sleeve 111, four wires of the four-core cable are respectively welded with four wires of the leading-out ends of the excitation wires and the induction wires one by using ferroelectric, finally, the upper end of the flat-head tube 112 is bonded to the lower end of the heat insulation sleeve 111 by using high-temperature-resistant glue, a part of the four-core cable is pulled out to the outer end and then the set screw 115 is screwed, and the set screw 115 prevents the welding point from being torn off. After the four-core cable is led out of the heating device, two lines connected with the excitation line 11 are respectively connected with the sine signal generator 4 and the parallel resistor (a second resistor R)217 and sliding rheostat R318) (ii) a Two wires connected to the induction wire 12, one connected to the first resistor R1One connected to ground and to capacitor 13.
When heating, current is introduced into the heating rod 124, the magnitude of the current is adjusted by the heating current controller 3, and the heating rate is adjusted; the heating rod 124 generates heat to heat the heating furnace core 122, the heating furnace core 122 transfers the heat to the flat head tube 112, the magnesia powder in the flat head tube 112 transfers the heat to the sample to be measured of the sample placing part 114, so that the sample to be measured is heated, and the temperature of the sample to be measured rises; at the same time, the PT100 platinum resistance temperature sensor 125 at the other end of the heating core 122 is also heated, and the temperature rises. Because the sample to be measured and the PT100 platinum resistance temperature sensor have good heat conductivity coefficient with the heating furnace core 122 of the copper block, and the distances from the sample to be measured and the PT100 platinum resistance temperature sensor to the heating furnace core 122 are equal, the temperature of the sample to be measured is the temperature indicated by the PT100 platinum resistance temperature sensor 125.
In the utility model, the PT100 platinum resistance temperature sensor 125 is connected with the temperature controller 2 for controlling the temperature in the heating device, if the temperature is not the required temperature, the temperature controller 2 controls the temperature in the heating device by controlling the on-off of the heating current; the heating current controller 3 controls the heating rate by controlling the magnitude of the heating current. The heating current controller 3 is connected with the temperature switch 126, if the temperature sensor 125 or the temperature controller 2 is damaged to cause uncontrollable temperature, the temperature of the heating device 1 is too high, and after the temperature exceeds 115 ℃, the temperature switch 26 can directly cut off the heating power supply to play a role in protection.
In the utility model, a hysteresis loop of a sample to be measured changing along with temperature can be observed by an oscilloscope, and the Curie point of a magnetic material can be accurately measured; the induced electromotive force of a sample to be measured at different temperatures can be measured through an alternating current voltmeter, and the Curie point of the magnetic material can be measured.
In the utility model, the frequency and amplitude output by the sine signal generator are continuously adjustable, and the magnetic material hysteresis loop can be used for researching the change relation of the magnetic material hysteresis loop along with the frequency and amplitude under different temperature conditions; the temperature of the sample to be tested can be adjusted, so that the tester can research the magnetization curve of the magnetic material at different temperatures.
Specifically, the curie temperature of the material can be tested by the following two methods.
1. The curie temperature was measured by measuring the temperature at which the hysteresis loop disappeared.
(1) The sample to be tested is placed in the heating device and connected with various electric appliance experimental instruments of the tester.
(2) The sine wave signal frequency of the sine signal generator 4 is adjusted to be about 10KHz, and the signal amplitude is properly adjusted; the oscilloscope is set to be in an X-Y working mode, and the magnetic field intensity is adjusted, so that a hysteresis loop appears on the oscilloscope.
(3) Setting the temperature value of the temperature controller 2 at 85 ℃, and starting a temperature switch 126; the heating current controller 3 is adjusted to enable the temperature displayed by the temperature controller 2 to slowly rise (the heating current value is reasonably adjusted according to the room temperature, so that the temperature rise lag of the sample and the data recording difficulty caused by overlarge heating current are avoided).
(4) With the temperature rise of the heating apparatus 1, attention is paid to observing the change condition of the hysteresis loop on the oscilloscope 6, and the temperature value displayed when the hysteresis loop becomes an approximate straight line is recorded, that is, the curie point temperature (attention is paid to the temperature range corresponding to the rapid change of the induced electromotive force) is measured and is included in the table.
(5) And adjusting the heating current to zero, setting the temperature control value of the temperature controller to be lower than the room temperature, turning off the temperature switch, and turning on the cooling fan to cool the heating device.
2. Measuring the relation of induced electromotive force with temperature
(1) Setting the temperature switch according to the Curie temperature value measured in method 1, the setting being such that T is measured in method 1CThe value is higher by about 2 ℃.
(2) And (3) turning off the cooling fan, turning on a temperature switch, adjusting the proper heating current, starting the heating device to heat, and recording the change relation of the induced electromotive force value measured by the alternating-current voltmeter 5 along with the temperature of the heating device. (the temperature is measured from 40 ℃ until the temperature is constant; when the induced electromotive force changes rapidly, the temperature interval is small, otherwise, the temperature interval is large.)
(3) Drawing an epsilon-T curve, drawing a tangent at the position with the maximum slope, and taking the intersection point of the tangent and the abscissa (temperature) as the Curie temperature Tc of the sample.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A magnetic material characteristic tester is characterized in that: comprises a heating device (1), a temperature controller (2), a heating current controller (3), a sine signal generator (4), an alternating current voltmeter (5) and an oscilloscope (6);
a driving coil (11) and an induction coil (12) are arranged in the heating device (1); one end of the excitation wire (11) is connected with the sinusoidal signal generator (4), and the other end of the excitation wire is connected with an X-axis input port of the oscilloscope (6); one end of the induction line (12) is grounded, and the other end of the induction line is connected with a Y-axis input port of the oscilloscope (6) through an amplifier (14); the front end of the amplifier (14) is connected with the grounding end of the induction line (12) through a capacitor (13);
the temperature controller (2) and the heating current controller (3) are both connected with a heating circuit in the heating device (1), the alternating current voltmeter (5) is connected with an alternating current-direct current converter (15), and the alternating current-direct current converter (15) is connected with the output end of the amplifier (14);
a flat head pipe (112), a heating furnace core (122), a heating rod (124) and a temperature sensor (125) are arranged in the heating device (1), and the heating rod (124) is vertically inserted into the lower part of the heating furnace core (122); the flat-head pipe (112) and the temperature sensor (125) are both vertically inserted into the upper part of the heating furnace core (122), and are respectively arranged at the left end and the right end of the heating rod (124) at equal intervals.
2. A magnetic material property tester as claimed in claim 1, wherein: also includes a first resistor R1(16) A second resistor R2(17) And a sliding rheostat R3(18)；
The first resistor R1(16) The opposite ends are connected in series with the grounding end of the induction line (12); the second resistor R2(17) And a sliding rheostat R3(18) Parallel connection, after parallel connection, one end is connected with the excitation wire (11), and the other end is grounded; the slide rheostat R3(18) The sliding end of the oscilloscope (6) is connected with an X-axis input port of the oscilloscope.
3. A magnetic material property tester as claimed in claim 2, wherein: the heating device (1) comprises a sensing component (110) and a heating component (120), wherein the sensing component (110) is arranged at the upper end of the heating component (120);
the sensing assembly (110) comprises a heat insulating sleeve (111), a flat head pipe (112), a sample testing cable (113) and a sample placing part (114); the flat head pipe (112) is arranged at the lower end of the heat insulation sleeve (111), and the filler is filled in the flat head pipe (112); the sample test cable (113) penetrates through the heat insulation sleeve (111), the excitation wire (11) and the induction wire (12) are wound in the sample placing part (114), the output ends of the excitation wire (11) and the induction wire (12) are connected with the sample test cable (113), and the sample placing part (114) is positioned at the bottom end of the flat-head pipe (112);
the heating assembly (120) comprises an upper cover (121), a heating furnace core (122), a lower cover (123), a heating rod (124) and a temperature sensor (125); the upper cover (121), the heating furnace core (122) and the lower cover (123) are sequentially arranged from top to bottom; the heating rod (124) is vertically inserted into the heating furnace core (122) through the lower cover (123); the flat head pipe (112) and the temperature sensor (125) both penetrate through the upper cover (121) and are vertically inserted into the heating furnace core (122); the heating rod (124) is connected with the heating current controller (3), and the temperature sensor (125) is connected with the temperature controller (2).
4. A magnetic material property tester as claimed in claim 3, wherein: the sensing assembly (110) further comprises a set screw (115), a screw hole communicated with the inner end is formed in the side wall of the heat insulation sleeve (111), and the set screw (115) is inserted into the screw hole.
5. A magnetic material property tester as claimed in claim 3, wherein: the plain end pipe (112) is of a structure with an opening at the upper end and a closed lower end, and the filler is magnesium oxide powder; heat-conducting silicone grease is coated between the heating furnace core (122) and the heating rod (124); the upper end of the flat head pipe (112) is bonded to the lower end of the heat insulation sleeve (111) through high-temperature-resistant glue.
6. A magnetic material property tester as claimed in claim 3, wherein: and a temperature switch (126) is arranged on the side wall of the outer end of the heating furnace core (122), and the temperature switch (126) is connected with the heating current controller (3).
7. A magnetic material property tester as claimed in claim 3, wherein: the material of heat insulating sleeve (111) is black POM plastics, the material of flat-end pipe (112) is 304 stainless steel, the material of upper cover (121) is polytetrafluoroethylene, the material of heating furnace core (122) is copper, the material of lower cover (123) is phenol-formaldehyde, heating rod (124) are nichrome heating pipe.
8. A magnetic material property tester as claimed in claim 3, wherein: the temperature sensor (125) is a PT100 platinum resistor temperature sensor, and the temperature controller (2) is a PID temperature controller.
9. A magnetic material property tester as claimed in claim 3, wherein: and a heat radiation fan is arranged at the outer end of the heating device (1).
10. A magnetic material property tester as claimed in claim 3, wherein: still include operating panel, operating panel is last to be provided with operation button and pilot lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920577534.9U CN210323331U (en) | 2019-04-25 | 2019-04-25 | Magnetic material characteristic tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920577534.9U CN210323331U (en) | 2019-04-25 | 2019-04-25 | Magnetic material characteristic tester |
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| Publication Number | Publication Date |
|---|---|
| CN210323331U true CN210323331U (en) | 2020-04-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920577534.9U Expired - Fee Related CN210323331U (en) | 2019-04-25 | 2019-04-25 | Magnetic material characteristic tester |
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| CN (1) | CN210323331U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112326714A (en) * | 2020-10-28 | 2021-02-05 | 北京北冶功能材料有限公司 | Device and method for measuring Curie temperature of magnetic material |
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2019
- 2019-04-25 CN CN201920577534.9U patent/CN210323331U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112326714A (en) * | 2020-10-28 | 2021-02-05 | 北京北冶功能材料有限公司 | Device and method for measuring Curie temperature of magnetic material |
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