SU1265667A1 - Device for stabilizing and measuring residual magnetization of permanent magnets - Google Patents

Abstract

The invention can be used to enhance the t-stabilization or calibration of permanent magnets. The purpose of the invention is to improve the accuracy of the calibration of permanent magnets and measurement. The device contains a mode switch 1, a master oscillator 2, keys 3 and 20, a magnetization converter 4, triggers 5 and 15, a measuring unit 6, a digital reading unit 8, a pulse counter 9, a controlled power supply 11, a current relay 13, a magnetic system 14, comparison unit 18, memory register 19 and delay element 21). To achieve this goal, a reversible converter 10, a magnetic converter 12, a generator of 16 counters (L pulses and a key 17 with the formation of new connections between the elements of the device. 2 Il.

Description

The invention relates to electrical measuring technology and can be used to improve the accuracy of stabilization or calibration of permanent magnets. Such calibration is necessary to bring up to a predetermined level and increase the stability of the residual magnetization of the permanent magnets used in precision instruments of measuring equipment and automation. It is accomplished by gradual partial demagnetization of pre-magnetized permanent magnets. During the calibration, magnets are also rejected, the initial (after magnetization) residual magnetization of which is lower than the magnetization of the control magnet. The aim of the invention is to improve the accuracy of the calibration of permanent magnets and the measurement. FIG. I shows the block diagram of the device; in fig. 2 - temporary. work diagrams, devices. The device (Fig. 1) contains a mode switch, serially connected to the master oscillator 2, the first switch key 3., and the magnetization converter 4, the first trigger 5 connected to the output of measuring unit 6, the second output of which is connected to a reversible counter 7 impulse coBi connected to the input of the digital reading unit 8, a pulse counter 9 connected in series and a digital-to-analog converter 10 (DAC), connected in series 1e controlled source And power supply, a converter 12, current relay 3 and a magnetic system at 14, Auto swarm trigger 15, consistent with the enumeration of the connections 16 reitepaTOp momenta and the third switch 17, audio unit 18 Comp connected via register 19 to the output memory 20 of the second switch, whose input is connected to the input element. cop 21 delays.

The switch 1 rezhimov the first output is connected to the second control

The INPUT of the first key 3 and the control input of the second key 20, and the second output with the controlled power source 11. Measuring unit 6

, its additional output is connected to the first trigger 5 directly, to the second trigger 15 through

At time t, keys 3 and 20. are closed, de-energizing the magnetization converter 4 and the measuring unit 6. In the coils of the magnetic system 14, a current pulse 1,, magnetizes the test specimen. At time ty, the output voltage is U, the current relay 13 is a reversible pulse counter 7 of pulses 672 delay 21, and to the input of the second key 20. The device operates as follows. The calibration or stabilization of permanent magnets is preceded by the measurement of the residual magnetization of the control sample and the recording of the measurement result in the memory register. To do this, at time t (Fig. 2), the Start signal through the mode switch 1 opens the first 3 and second 20 keys. Magnetization converter 4 and measuring unit 6 are powered from master oscillator 2. A measuring signal corresponding to the value of the residual magnetization of the test sample is fed to the input of measuring unit 6 and then to the direct count input of the reversible counter 7 pulses Ug. At time t, the current value of the voltage at the output of the pulse counter 7 reaches the voltage U. The measurement result is recorded on the digital readout unit 8. After the measurement is completed, the control signal is removed from the auxiliary output of the measuring unit B End of measurement Ug, through the second key 20 enters the control input of the memory register 19, recording the measurement result in the memory register corresponding to U. The output block of the comparison block U | g varies depending on the code values on it odes or conditionally stresses. When, g, U, g 0,; when and U (5, U, g 1. At the time t, level u occurs., In the register register record and U, the former time is greater than U | g (and 0) becomes equal to it, i.e., g 1. At this time, Ujg becomes equal to 1 and the second trigger 15 is blocked. At time tj, a pulse Uv arises from the output of delay element 21, which does not | Can flip the second trigger 15 to another steady state.

is reset to O and flips the trigger 5 to another state. In this case, the residual magnetization of the calibrated magnet is measured. At time t and U | g 0. At time t, the measurement ends. At time to, trigger 15 is transferred to

about

the opposite state, opening the key 17, since U | g 0. At the output of the key 17, there are pulses U., which are fed to the counting input of the counter 7 and the input of the counter 9 pulses, Output voltage of the DAC

increases and UY decreases. In the 5

and,

time point t, and U, g 1, whereupon the trigger 15 returns to its initial state, locking the key 17 and the controlled power source 11

At this moment, a controlled power source I1 is started, creating a current pulse 1 in the coils of the magnetic system 14 (whose amplitude is determined by a counter of 9 pulses, a DAC 10 and a magnetic converter 12. At time i, a pulse occurs: and, which starts the device measurement of the residual magnetization of the magnet to be calibrated At time t, 2, the measurement is completed. At time t, the formation of a new current pulse begins. At the moment a new current impulse is generated in the coils of the magnetic system. UNT t, g there is a new measurement of residual magnetization at the time t | j:. Measurement ends and all the work of the entire device, as UysUo and

and,. Tilting trigger 15 does not occur.

invention formula

; A device for stabilizing and measuring the residual magnetization of permanent magnets containing an incompletely closed magnetic system connected to a current relay, controlling a power source connected in series by a master oscillator and the first key whose code

connected to the magnetization transducer and the measuring unit, the first trigger, the output connected to the first control input of the first key, mode switch, the first output connected to the second control input of the first key and the control input of the second key, its input connected to the first output measuring unit and one of the inputs of the first trigger, the second input of which is connected to the first output of the current relay and the installation input in O of the reversible pulse counter, the comparison unit, the first input of which connects with the input of the digital reading unit, with the output of the reversible pulse counter and through the memory register with the second input of the comparison unit, the second input of the memory register connected to the output of the second key, and the output of the magnetization converter with the second input of the measuring unit, characterized in that , in order to improve the accuracy of the calibration of permanent magnets and measurement, it additionally introduced a series-connected counting pulse generator, a third key, a pulse counter, a digital-to-analog converter, and a magnet A second converter, as well as a serially connected delay element and a second trigger, the output of the third key is connected to the reverse account input of a reversible pulse counter, the direct account input of which is connected to the second output of the measuring unit; the output | of the magnetic converter is connected: to the current relay input, and the input of the magnetic converter to a controllable power supply, with its first control input connected to the second output of the mode switch, and the second control input with a control input The third key and the output of the second trigger, the second input of which is connected to the output of the comparison unit, and the input of the delay element to the first output of the measuring unit.

Claims (1)

Claim An apparatus for stabilizing and iz ₄₅ * measurements were residual magnetization of the permanent magnets, comprising a fully closed magnetic system connected to a current relay .upravlyaemy power supply _post-50 sequence coupled master oscillator and the first switch, the output of which magnetizations and measuring, unit, the first trigger, the output connected to the first control input of the first .key, mode switch, the first output connected to the second control input of the first key and the control input of the second key, its input ohm connected to the first output of the measuring unit and one of the inputs of the first trigger, the second input of which is connected to the first output of the current relay and the input of setting to ”0 a reverse pulse counter, a comparison unit, the first input of which is connected to the input of the digital reading unit, with the output of the reversible counter pulses and through the memory register - with the second input of the comparison unit, the second input of the memory register is connected to the output of the second key, and the output of the magnetization converter - with the second input of the measuring unit, distinguishing I mean, in order to increase the accuracy of the calibration of permanent magnets and measurement, a counted pulse generator, a third key, a pulse counter, a digital-analog converter and a magnetic converter, as well as a delay element and a second trigger are connected in series, the output of the third key is connected to the input of the countdown of the reversible pulse counter, the input of the direct count of which is connected to the second output of the measuring unit, the output '[magnetic conversion spruce is connected [to the input of the current relay, and the input of the magnetic converter is connected to a controlled power source, with its first control input connected to the second output of the mode switch, and the second control input is connected to the control input of the third key and the output of the second trigger, the second input of which is connected to the output block comparison, and the input of the delay element with the first output of the measuring unit.