SU1476539A1 - Method and apparatus for demagnetization of permanent magnets of polarized switches - Google Patents

Abstract

The invention relates to electrical engineering and can be used to demagnetize the permanent magnets of electromagnetic polarized remote switches. The purpose of the invention is to increase the accuracy of demagnetization. The demagnetization method consists in supplying a polarizing switch increasing from zero to the maximum operating voltage during the moments between demagnetizing pulses, applying a predetermined voltage to the voltage comparison device and isolating the actuation moment, comparing it with the moment of equality of the voltages on the switch coil and the preset tension The switch contacts, which are sensors, are unlocked only at the moment when the rising polarized switch is rising from zero to the maximum operating voltage. When a predetermined trigger voltage is reached, the flow of increasing demagnetizing pulses into the demagnetizing coil is stopped. A device that implements the method includes a sawtooth voltage driver 1, an analyzer 2 that selects a command to stop the demagnetization process, a constant voltage driver 3 containing a stabilized calibrated source, a control unit 4, a progressive pulse driver 5 that uses phase control circuits the magnitude of the pulses, the demagnetization coil 6. The sawtooth shaper is connected to the switch 7 and to the analyzer 2. The analyzer 2 is connected to the constant shaper 3 april with a switch 7 and a control unit 4. The control unit 4 is connected to a progressive pulse shaper, which is connected to the degaussing coil 6. 2 sec. f-ly, 2 ill.

Description

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The invention relates to electrical engineering and can be used for the partial demagnetization of permanent magnets of electromagnetic polarized remote switches.

The purpose of the invention is to increase the accuracy of demagnetization.

FIG. 1 shows the graphs for

the dependencies of the feed and master nap

zheniy (a) and current (b) from time to time; in fig. 2 is a block diagram of an apparatus for carrying out the proposed method.

The method of demagnetizing the constant of the magnets of the polarized remote switches is that at the time of the absence of the demagnetizing impulse an increasing voltage from zero to the operating value is applied to the coils of the switch. When the switch is triggered, the voltage is fixed, which is compared with a predetermined value. If the trigger voltage is greater than a predetermined value, t a more powerful impulse comes into the degaussing coil. When triggered at a voltage equal to or less than the pre-set value, the demagnetization process is terminated. When applying a voltage increasing from zero to the operating value of a coil of a switch with a duration of 0.5, transients in the relay coil are minimized, which leads to a stabilization of the response voltage.

An apparatus for carrying out the method of demagnetizing permanent magnets of polarized switches (Fig. 2) includes a saw voltage generator 1, an analyzer 2, a constant voltage driver 3, a control unit 4, a progressive pulse shaper 5, and a demagnetizing coil 6.

The control unit 4 has three outputs that are connected to the sawtooth voltage driver 1, the first input of the analyzer 2 and the driver 5 of amplitudes of demagnetization pulses, moreover

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the second input of the analyzer, the other with the winding of the switch 7, the contacts of which are connected to the third input of the analyzer 2. The output of the constant-voltage driver 3 is connected to the fourth input of the analyzer 2, the output of which is connected to the control unit 4.

The device works as follows

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Under the influence of the control unit 4, the shaper 5 of amplifying demagnetization pulses creates in the demagnetizing coil 6 a series of pulses increasing in amplitude (power). In the intervals between the demagnetizing pulses from the sawtooth generator, signals are sent to the winding of the switch 7 and the analyzer. At the moment the switch 7 is triggered in the analyzer 2, the voltages are compared with the formers 1 and 3, respectively, of the sawtooth and predetermined voltages. Depending on the ratio of these voltages, from the analyzer 2, control is sent to control unit 4 to stop or continue demagnetization.

In the proposed method of demagnetization of permanent magnets of polarized switches, the method of comparing two quantities is used, the time moment of equality of two quantities is easily emitted with great accuracy, which allows to build an algorithm for the operation of an automated device that demagnetizes the magnets of polarized switches also with great accuracy.

Claims (2)

1. A method of demagnetizing the permanent magnets of polarized switches, which includes supplying the demagnetizing coil with increasing power during each pulse period, supplying a predetermined constant voltage of the polarized switch, characterized in that increase demagnetization accuracy, polarized to the coil the latter is connected to a demagnetizing 55 switch switch 6 which serves to build up the coil 6. Shaper 1 sawboode From zero to the maximum voltage, has two polarization triggers, one of which is connected to the switch between the demagnetizing pulses, the moment of tripping is fixed a polarized switch and compares the trigger voltage with a predetermined value at which the demagnetizing pulses are stopped. 2. A device for demagnetization of permanent magnets of polarized switches containing a constant voltage generator, a driver of amplitude-increasing demagnetization pulses, a control unit, a demagnetizing coil, and one output of the control unit is connected to the input of the amplifier-amplitude pulses, which amplify the amplitudes of the amplitudes of pulse amplitudes of the amplitudes of pulse amplitudes of the amplitudes of pulse amplitudes of the amplitudes of pulse amplitudes of the amplitudes of pulse amplitudes of the amplitudes of pulse amplifiers connected to A degaussing coil, characterized in that the sawtooth shaper and analyzer, which has three inputs and terminals for connecting the switch contacts, are additionally introduced; one of the inputs is connected to the output of the saw voltage shaper, the second one with the voltage driver, the third one with the second input of the control unit, the third output of the control unit is connected to the input of the sawtooth generator, which has terminals for connecting the switch coil, the output of the analyzer is nen to the input of the control unit.