SU1033998A1 - Device for permanent magnet residual magnetization stabilizing and measurement - Google Patents

Abstract

A DEVICE FOR STABILIZATION AND MEASURING THE RESIDUAL MAGNETICITY OF PERMANENT MAGNETS containing an incompletely closed magnetic system, a master oscillator, the output of which through a first key is connected to the magnetization converter and the digital balancing converter, the second input of which is connected to the transducer body and its body and the balance body and the balance body and the balancing device, the second balance of the balance and the balance , trigger, output, associated with the first control input of the first key, the second control input of which is associated with the first output of the switch: Aims and with the control input of the second key, the signal input associated with the second output of the digital balancing system and with the first trigger input, from which, in order to improve the speed and accuracy of calibration of permanent magnets, it is entered sequentially switched on generator of shots, controlled frequency divider, third key, source of unipolar pulses and current relay, the first output of which is connected with the magnetic system, the second with the second trigger input, and four series connected in series key and time relay, the output of which is connected to the second input of the third key, serially connected memory register and arithmetic logic unit, the second input connected to the output of the digital balance system and the first input of the memory register, the second input of which is connected to the output of the second key , the control input of the fourth key is connected with the upper output of the arithmetic logic unit, the second output connected to the control input. The control frequency divider, | The control input of the source of single-pole 51p-i S0. 00 pulses is connected to the second output of the mode switch, and the signal I input of the fourth key is connected to the second second, to the digital system / and balancing. 00

Description

The invention relates to electrical measuring equipment and can be used to bring up to a predetermined level and to increase the stability of the residual magnetization of permanent magnets / used in precision measuring equipment and automation devices. V. A device for determining the characteristics of magnetic materials is known, in which it is possible to calibrate and stabilize permanent magnets by partially demagnetizing pre-magnetized magnets in the field of an electromagnet fed with a constant or alternating current. In these devices, the magnets are placed in the air gap of the electromagnet and they carry out as far as cycles of partial demagnetization by successively increasing the amplitudes of the demagnetizing field. - After each cycle, the residual magnetization is measured, gradually approaching the specified level C13. However, the accuracy of calibration and its rapid response due to the manual control of the demagnetizing field are insufficient. It is known. A device comprising an incompletely closed magnetic circuit, a master oscillator, the output of which is connected to the magnetization transducer through the first key, and a digital equilibration system, the input of which is connected to the output of the magnetization transformer, and the output to the digital readout unit, trigger, output connected to the first : the control input of the first key, the second control input of which is associated with the first output of the mode selector and with the control 1sadym input of the second key, its signal input of the same with torym output digital system equilibration and the first input of the flip-flop 2. However, the calibration speed and accuracy of its resulting from application of low frequency alternating ggvremagnichivayuschego floor and constant slew rate nstvom its amplitude insufficient. The purpose of the invention is to increase the speed and accuracy of calibration of permanent magnets. This goal is achieved in that a device for stabilizing and measuring the residual magnetism of permanent magnets, contains an incompletely closed magnetic system A with a back generator, the output of which through the first key is connected to a magnetization converter and a digital balance system, the second input of which is connected to the output of the converter the magnetization and the output to the digital readout block, the trigger, the output connected to the first control input of the first key, the second control input of which is connected to the first output of the mode switch and with the control input of the second key, the signal input connected to the second output of the digital balancing system, and with the first trigger input, sequentially connected pulse generator, controlled frequency divider, third key, source of single-pole pulses. Current a relay, the first output of which is connected to the magnetic system, and the second from the second. Pb1M trigger input, as well as a sequence; the fourth key and the time relay, whose output is connected to the second input of the third key, connected in series to the memory register and the arithmetic logic unit, are repeated by the input connected to the digital balance output and to the first input of the register , the second input of which is connected with the output of the second key, the control input of the fourth is connected with the first output of the arithmetic logic unit, the second output connected to the control input of the controlled A frequency switch that controls the input source of the unipolar pulses is associated with the output of the mode switch, and the signal input of the fourth key with the output of the digital balancing system. . The drawing shows the block diagram of the device. ; The device contains a mode switch 1 that sets the generator 2, the first key 3, the magnetization converter 4, the trigger 5, the digital balancing system b, the digital reading unit 7, the second key 8, the arithmetic logic unit 9, the fourth key 10, the time relay 11., pulse generator 12, controlled frequency divider IJ, third key 14, source of 15 unipolar pulses, current relay 16, magnetic system 17, memory register 18. The device works in the following way. Permanent magnets are calibrated or stabilized in two cycles. In the first cycle, the residual magnetization of the control sample is measured, and the measurement result and the memory register are recorded. For this, the Start 3 signal opens the first 3 and second 8 keys via the mode switch 1. The magnetization converter 4 and the digital balancing system are crammed from the master oscillator 2. The measuring signal corresponding to the value of oC of the exact condition of the control sample is provided with an iTa input of the digital balance system 6 and the measurement; by her. The measurement result is recorded on the digital reading unit 7. After the measurement is completed, the control signal is removed from the additional output of the digital balancing system. The end of measurement, which through the open second key 8 is fed to the control input of the memory register 18. At this time, recording is performed. measurement result of the residual magnetization of the control sample in the memory register 18. In the second cycle, the mode of calibration or stabilization of permanent magnets occurs. For this, the test sample is placed in the gap of the magnetic system and is automatically magnetized with subsequent demagnetization to a predetermined level of residual magnetization. Ra: The bot device in this case is performed in the following manner. : The Start signal through the mode switch 1 closes the first AND second keys and starts the source of the 15 unipolar signals. In this case, a magnetizing current pulse arises in the magnetic system 17. As the current s decreases, the coils of the magnetic system to zero by a signal from the current relay 16 overturn, the trigger 5 to the position at which the first key 3 opens. Through the open first key 3 magnetization converter 4 and the digital balance balancing system. From the 2T master oscillator, the digital balance balancing system measures and records the residual magnetization value on the digital reading unit 7. In the process of measurement, the arithmetic logic unit 9 compares the reference encoded signal from the memory register 18 with the current encoded signal from the digital equalization system. The difference encoded signal is fed to the controlled frequency divider 13, adjusting it. Moreover, with the maximum difference between the current and reference magnetization values of the control, the first frequency divider 13 is set to the position corresponding to the minimum frequency division. If the current and reference values of magnetization do not coincide with the signal from the arithmetic logic unit 9 at the end of the measurement, the fourth key 10 opens. Signal The end of measurement from the digital system b balances: on time 11, which opens: third for a specified time the third key 14. At the same time, the Signigip End measure 1033998 neither the trigger 5 is transferred to the second state, in which 9ac | The first key 3 and the de-energizer with the converter 4 are magnetized by KoCiM and the digital system is equal to the impulse. The pulses from the generator 12 are pulsed: with a tracking frequency determined by the controlled divider 13 Frequencies, through the open third key 14 | pulses that form the demagnetization of the current impulse in the magnetic system 17. Moreover, the magnitude a 1 1 of the magnitude of the demagnetizing pulse depends on the pulse frequency at the input of the source 15 of the same-field p-. yngtulsov. When the current pulse has been formed, the third key 14 is closed, the current in the magnetic system 17 drops to zero. At this moment, the signal from the current relay 16 triggers 5 seconds and is transferred to the state, the first key 3 is opened with the breaker key, and the magnetization converter 4 and the digital balancing system are energized. Again, the residual wiredness measurement takes place, the current and reference sigals are compared in the arithmetic logic unit 9, the corresponding setting of the controlled frequency divider 13 and the next demagnetization cycle. At each subsequent cycle, the magnitude of the current in the magnetic system 17 increases once the magnitude increases, and the speed of its increase increases as the current and reference magnitudes decrease, due to a decrease in the pulse frequency at the output of the controlled frequency divider 13, which allows the most accurate bending test specimen. The process of partial demagnetization of the test sample with a subsequent measurement of the residual magnetization will continue. as long as the current value of the magnetization is equal to its reference value. In this case, the output of the arif "b-. There is no signal in logical logic unit 9, which opens the fourth key 10 and the signal at the end of measurement cannot start the time relay to form the next demagnetizing current pulse in the magnetic system. This completes the calibration process of the test sample and the digital reading unit 7 fixes the last value of the residual magnetization. Iskopol | ivanie new speed control unit, the increase in amplitude: demagnetizing pulses advantageously distinguishes the proposed device for stabilizing and measuring the residual magnetization of permanent magnets

51033998

About the indicated prototype, since its accuracy will increase, the accuracy of the calibration speed and the reduction of permanent magnets will increase the range of measurement. As a result, impregnated sizes of post-3Tot o will be increased;

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Claims (1)

DEVICE FOR STABILIZING AND MEASURING THE RESIDUAL MAGNETIZATION OF PERMANENT MAGNETS, containing an incompletely closed magnetic system; a master oscillator, the output of which is connected via the first key to a magnetization converter and a digital balancing system, the second input of which is connected to the digital output of the magnetization converter, and the output is , a trigger, with an output connected to the first control input of the first key, the second control input of which is connected to the first output of the mode switch and the control input of the second key, the signal input connected to the second output of the digital balancing system and the first trigger input, which means that in order to increase the speed and accuracy of the calibration of permanent magnets, a pulse generator, a controlled frequency divider, is introduced into it, the third key, the source of unipolar pulses and a current relay, the first output of which is connected to the magnetic system, the second with the second trigger input, as well as the fourth key and relay in series The output, whose output is connected to the second input of the third key, is connected in series to the memory register and the arithmetic logic unit, the second input is connected to the output of the digital balancing system and to the first input of the memory register, the second input of which is connected to the output of the second key, the control input of the fourth key is connected to the first output of the arithmetic logic unit, the second output connected to the control input of the controlled frequency divider, the control input of the unipolar pulse source is connected to the second the output of the mode switch, and the signal input of the fourth key with the second output of the digital balancing system. ФО ФО (с ζ © 00 1 1033998