SU760005A1 - Device for measuring and monitoring permanent magnet parameters - Google Patents

Description

The invention relates to the field of magnetic measurements and is intended for automatic measurement and monitoring of magnetic parameters of permanent magnets.

A device for measuring magnetic induction is known, which contains a Hall sensor, a source for powering a Hall sensor, a recording device. The zero voltage level at the output of the Hall sensor, installed in this device with the help of balancing resistors, is maintained when the external conditions change by the automatic control system [1].

However, in the known device, the influence on the reliability of measurements of only the resistive component of the residual voltage is eliminated. Hall sensor.

The closest to the present invention is a device for measuring and monitoring the parameters of permanent magnets, which contains an electromagnet, a Hall sensor located in the electromagnet gap, a power source, a voltage-code converter, and register 2

This unit, unit setup, adder and memory register [2].

However, the reliability of control of magnets using this device is not always sufficiently high, which is associated with the influence on the error of control of the residual parameters of the elements of the device, namely the residual voltages of the Hall sensor, the residual magnetic flux of the electromagnet and the noise voltage.

The purpose of the invention is to improve the accuracy of measurement and control by reducing the influence of the residual parameters of the elements of the device.

This goal is achieved by the fact that a device for measuring and monitoring parameters of permanent magnets, containing an electromagnet, a Hall sensor located in an electromagnet gap, a stabilized source for powering a Hall sensor, a voltage-code converter, an output unit connected to the output of a Hall sensor, a recording unit, a block of settings , adder, one input of which is connected to the output of voltage converter 760005

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the output code with the inputs of the registering block and the settings block, and the memory register, whose information input is connected to the converter output voltage code, the output to the second input of the adder, the reset input to the control output of the voltage code converter, provided with a threshold element the input of which is connected to the output of the Hall sensor, and the direct and inverse outputs to the synchronizing inputs of the memory register and the adder, respectively.

The drawing shows a block diagram of the device.

A device for measuring and monitoring the parameters of permanent magnets contains an electromagnet 1, in the gap of which Hall sensor 2 is located, a stabilized source 3 for powering a Hall sensor, a voltage-code converter 4, an adder 5, the output of which is connected to the inputs of a registering unit 6 and a unit 7 of installations, threshold element 8, the input of which is connected to the output of the Hall sensor. Direct 9 and inverse 10 outputs of the threshold element 8 are connected to the clock inputs of the adder 5 and the memory register 11. The output of the inverter 4 is connected to the inputs of the adder 5. and register 11. From the output of the converter 4, the code goes to the adder 5 or to the register 11, depending on which of the synchronizing inputs of the adder of the memory register has a resolving potential at a given time. The control output of the inverter 4 voltage code is connected to the reset output of the register 11.

The device works as follows.

In the absence of a controlled magnet in the working gap of the electromagnet G is the voltage at the Hall contacts of the Hall sensor 2? proportional to the sum of all residual parameters of the elements of the device, the converter 4 continuously converts into a digital code. This code enters the register 11, since its synchronizing input has a resolving potential, which is supplied from the direct output 9 of the threshold element 8. In the adder 5, the code does not enter, because its synchronizing input contains the inhibitory potential from the inverse output 10 of the threshold element 8 At the end of each coding cycle at the control output of the converter 4, a signal is generated, which arrives at the reset input of register 11, which is used to set the memory register to its initial state. Then a new coding cycle begins by the converter 4 of the output voltage of the Hall sensor 2, i.e. The code-voltage converter operates in a periodic start mode.

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When moving the electromagnet 1 of the monitored magnet into the working gap and magnetizing it, the voltage at the output of Hall sensor 2 increases in absolute value, and the threshold element 8 is activated and the potential levels at its outputs 9 and 10 are reversed. proportional to the sum of the values of the parameter of the monitored magnet and the residual parameters of the device elements of the device is converted by the converter 4 into a code that is fed to one of the inputs of the adder 5.

To the second input of the adder 5, the output of the memory register is fed to the result code of the last before placing the controlled magnet into the working gap of the electromagnet measuring the total residual signal. The synchronizing input of the adder 5 now has a resolving potential. Therefore, in the adder 5, the codes that exist at its inputs are subtracted, taking into account their signs. During the control of the reset register magnet, 11 ns occurs, since this reset is possible only if there is a resolving potential on the synchronizing input of the register. Thus, at the output of the adder 5, the code proportional to the value of the monitored parameter is free from the influence of the residual parameters of the elements of the device. This code is fed to the recording unit 6 and the setting unit 7.

In block 7 of the settings, the values of the settings of the magnetic parameters are set in digital form. When the device is operated in block 7, the code at the output of the adder is compared with the set values, and a “Fit” or “Marriage” signal is produced to sort the magnet based on the comparison result.

After "removing the controlled magnet from the working gap of the electromagnet 1, the voltage at the output of the Hall sensor 2 decreases, the threshold element 8 returns to its original state. The inhibitory potential appears at the synchronization input of the adder 5, and the enabling potential appears at the synchronization input of the register 11. The device starts again work in the mode of continuous measurement of the residual parameters of its elements. It should be noted that the correction of measurement and control results occurs without slowing down I device, in the intervals between the control of the magnets.

Improving the reliability of measurement and control allows you to improve the quality of the magnets, which are controlled by the magnetic field created by them.

Eliminating manual zero adjustment in the device simplifies operation

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device and helps to reduce the subjective errors in the measurement and control of magnets.

Claims (1)

Claim A device for measuring and monitoring the parameters of permanent magnets containing an electromagnet, a Hall sensor located in an electromagnet gap, a stabilized source for powering a Hall sensor, a voltage-code converter, an output connected to the output of a Hall sensor, a recording unit, a setting block, an adder, one input of which connected to the output of the voltage-code converter, and the output to the inputs of the registering unit and the setting block, and a memory register whose input is connected to the output of the voltage-code converter, output g with $ vtopyalyu open the input of the adder, the reset input - with the control output of the converter voltage-code, which differs in that, in order to improve the measurement accuracy 5 and control by reducing the influence of the residual parameters of the elements of the device, it is equipped with a threshold element, the input of which is connected to the output of the Hall sensor, and the direct and inverse outputs with synchronizing U inputs respectively register memory and adder.