RU1798746C - Device for measurement of characteristics of magnetic materials - Google Patents

Abstract

SUMMARY OF THE INVENTION: A test sample is magnetized over a limit hysteresis loop. Signals proportional to the external field strength and magnetization of the sample are fed to the divider. A voltage proportional to the demagnetization coefficient of the sample is stored. The transmission coefficient of the link with the adjustable transmission coefficient is adjusted accordingly, and the recorder records the characteristic of the sample material. 3 ill.

Description

The invention relates to magnetic measurements and can be used to control the magnetic characteristics of magnetic materials on samples in an open magnetic circuit.

The aim of the invention is to increase the productivity of the test process by automating the process of adjusting the gear ratio of the link with an adjustable gear ratio.

Figure 1 is a block diagram of an apparatus for measuring the characteristics of magnetic materials; figure 2-section of the loop

hysteresis of the magnetic material from which the test sample is made, as the dependence of magnetization on the internal M (H) and external M (He) magnetic field strengths; Fig. 3 shows a portion of the hysteresis loop of the magnetic material from which the test sample is made, as the dependences of the magnetization induction B on the strength of the internal and external magnetic fields.

A device for measuring the characteristics of magnetic materials (figure 1) contains a magnetizing device (block) 1,

  ABOUT

to the output of which the magnetizing system 2 and the measuring transducer 3 of the external magnetic field strength are connected in series, the non-magnetization measuring transducer of the test sample 4, consisting of the measuring 5 and compensating 6 windings, an integrator 7 connected to the output of the magnetization measuring transducer, a recording device 8, an amplifier 9 connected to the output of the voltage measuring transducer 3, an adder 10, the first input of which is connected to the output of the amplifier 9, and the output is to the first input of the recording device 8, the second input of the latter is connected to the output of the integrator 7, link 11 with adjustable / coefficient / transmission., the output of which is connected to the second input of the adder 10i and the first input: to the output of the integrator 7. In addition, the device comprises a divider 12, a storage device (block) 13 and a voltage comparator 14 inside the test sample 4, moreover, p-er-. the output of the divider 12 is connected to the output of the amplifier 9, and the second to the output of the integrator 7, the first input of the storage device 13 is connected to the output of the voltage comparator 14, located on the surface of the test sample 4 in the region of its neutral cross section, and the link. 1.1 with an adjustable transmission coefficient is made in the form of a multiplier, to the second input of which a voltage is supplied from the output of the storage device 1.3, which is proportional to the desired transmission coefficient. ::

The device operates as follows. The test sample 4 is magnetized by the limit hysteresis loop under the action of an external magnetic field created by the magnetizing system 2 under the action of the current supplied from the output of the magnetizing device 1. Measuring information about the rate of change of the magnetization of the test sample 4 and the intensity of the weak magnetic field is fed to the inputs of the integrator 7 and amplifiers 9, respectively, from the measuring outputs ..; transducers of magnetization and external magnetic field strength. The first and second inputs of divider -12 are supplied with voltages proportional to the external magnetic field and magnetization of sample 4. The output signal of the divider 12, which is a quotient of the external magnetic field divided by H g. and magnetization M, is applied to the second input of the storage device 13. At the moment when the voltage inside the test sample 4 becomes equal to zero, the voltage comparator 14 provides a control signal. to the first input of the storage device 13 for storing the voltage supplied to the second input. It is proportional to the demagnetization coefficient of the given test sample 4, as a result of which, starting from this point in time, the transmission coefficient equal to the demagnetization coefficient of the test sample 4 is set at the link 11 with an adjustable transmission coefficient under the control of the memory device 13, and it implements the expression (1) . In turn, an adder 10 having transmission coefficients of 1 and -1, respectively, implements expression (2) at the first second inputs. Thus, the recording device captures the characteristic of the magnetic material M (H) from which the test sample is made.

The elements of the device for measuring the characteristics of magnetic materials can be performed, for example, as follows:

-magnetizing device 1 in the form of a source of pulsed magnetic alternating field;

- magnetizing system 2 in the form of a solenoid;

- an external magnetic field strength meter in the form of a shunt;

. magnetization measuring transducer, consisting of measuring 4 and compensating windings, similar to that described in the prototype;

..- an oscilloscope or a two-coordinate recorder could be used as a recording device;

-divider 12 and link 11 with adjustable transmission coefficient can be performed on integral multipliers x type K525PS1;

, / -memory device can be performed on the integrated circuit K1100SK2;

-13 comparator of tension inside the test sample can be performed on a ferromodulation converter. : The use of the inventive device for measuring the characteristics of magnetic materials in comparison with a device of a similar purpose (prototype) allows testing magnetic samples with higher productivity by automating the process of constructing a link with an adjustable transmission coefficient, ..

Claims (1)

The claims A device for measuring the characteristics of magnetic materials, comprising: a magnetizing unit; the output of which is connected in series with a magnetizing system and a voltage measuring transducer, a magnetization measuring transducer in the form of measuring and compensating windings, an integrator connected to the output of a magnetization measuring transducer, a recording device, an amplifier connected to the output of a voltage measuring transducer, an adder, a first input and the output of which is connected respectively to the output of the amplifier and to the first input of the recording device, the second input of which is connected to the integrator output, a link with an adjustable transmission coefficient, the output and the first input of which are connected to the second input of the adder and to the integrator output, respectively, characterized in that, in order to increase productivity, it is equipped with a divider , a storage unit and a voltage comparator, and the inputs of the divider are connected to the outputs of the amplifier and integrator, the inputs of the storage unit are connected to the outputs of the voltage switch and the divider, and but with adjustable transmission coefficient is made in the form of a multiplier, to the second input of which the output of the storage unit is connected.