SU1372406A1 - Touch-free switch - Google Patents

Abstract

The invention relates to the field of electrical engineering and can be used to control the position of various mechanisms. The purpose of the invention is to increase the sensitivity and the expansion of the field of application. The contactless switch consists of a movable core I and magnetically modulated sensors (MD) 2 and 3, on the middle rods 4 of which windings 6 sub-magnetizing are located, output windings 7 and additional windings 8. Output signals are removed from the windings 8 of both MD. When measles 1 is outside the zone of interaction with the MD, the output signals taken from the windings B are equal to each other. When installing the core over one of the MD, the output signal taken from this MD is minimal, and the signal taken from the second MD is maximum. 2 Il. with (L

Description

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The invention relates to electrical engineering and is intended to control the position of various production mechanisms.

The aim of the invention is to increase the sensitivity of a contactless switch and expand its range of application.

Fig, 1 shows a switch, a longitudinal section; Fig. 2 is a circuit for switching the windings of a switch.

The contactless switch consists of a movable core 1 and two sensors 2 and 3. Each sensor is an Ш-shaped magnetic core with a middle rod 4 and extreme rods 5. A bias magnetic winding 6 is placed on the middle rod 4, the Middle rod 4 is designed as a locking W-shaped core, the window of which contains a magnetically sensitive element made in the form of output winding 7, and additional output winding 8, Winding 7 and 8 are included according to, In each sensor the magnetic circuit for winding 6 is open, and for winding current 7 and 8 are closed, windings 7 of sensors 2 and 3 are connected in series with each other, Additional output winding of sensor 2 via a rectifying bridge 9 is connected in series with the magnetizing winding 6 of sensor 3, and additional winding 8 of sensor 3 through a rectifying bridge 9 - in series with the magnetizing winding 6 of the sensor 2, t, e, the windings 8 are the power sources of the magnetizing windings, to the trip switch of the sub

dits alternating voltage,

Output from the signals and ,,, „and and“ „are filmed

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current 8 of both sensors. Output and

B1

can be removed from the same poles of the rectifying bridges 9, the magnetic and electrical parameters of sensors 3 and 2 are the same.

The switch works as follows.

When the measles 1 associated with the moving object is outside the zone of interaction with the sensors, when power is supplied to the voltage device on the windings 7 of sensors 2 and 3 are equal, therefore the magnetizing windings 6 of sensors 2 and 3 flow around the same current. Since the magnetic circuits in the sensors for the windings 6 are open, the bias

62

middle rods 4 with windings 7 and 8 equally occur due to scattering currents. Due to the identity of the parameters of sensors 2 and 3, the output voltages Ug ,, and, and ,,, taken from the windings 8 are equal to each other, and the output voltage taken from the positive terminals of the connectors 9 is zero,

When the core is moved to the left and installed above sensor 2, the magnetic circuit for winding 6 closes through the pin I, the constant magnetic flux of winding 6 increases, as a result of which the magnetization of windings 7 and 8 in sensor 2 increases. The inductance of the winding 7 of the sensor 2 reduces

c, therefore, the voltage across it also decreases, and the voltage across the winding 7 of sensor 3 increases. The voltage on the winding 8 of the sensor 2 decreases, and on the winding 8 of the sensor 3 increases, which leads to an increase in the current of the winding 6 of the sensor 2 and a decrease in the current of the winding 6 of the sensor 3, m, e, additional biasing of the sensor 2 and weakening the biasing of the sensor 3, V As a result, the inductance of the windings 7 and 8 of the sensor 2 decreases, and the voltage across the windings 7 and 8 of the sensor 3 increases. This leads to an increase in the winding current in the sensor 2 and an increase in the magnetization of the windings 7 and 8 of the sensor 2, a decrease in the bias current of the winding 6 of the sensor 3, and a decrease in the voltage on the windings 7 and 8 of the sensor.3. This happens before the steady state occurs when the inductance windings 7 and 8 of sensor 2 are close to zero. Voltage

five

0

five

and

64 1

on the sensor 2 is minimal (almost zero), and the voltage U j, on the sensor 3 is maximum, the maximum constant voltage U g, of a certain polarity, must appear at the output of the same poles of the rectifying bridges.

Thus, from the moment of installation of the corona over sensor 2 until the moment of corroding from it, the voltage is minimal (close to zero), and the voltage and jbi 7 is maximum, the maximum value is also the voltage Ug ,,,

After the movement of the core 1 from the sensor 2, the voltages on the windings 8 are aligned with each other, and the voltage

and

1i, removable from the poles of the rectifier

Claims (1)

Claim 30 Non-contact switch containing a movable armature designed to communicate with a controlled object, a magnetomodulation sensor containing magnetically sensitive elements, a ΠΙ-shaped magnetic circuit, on the middle shaft of which is located a constant magnetoresistance source, made in the form of a magnetization winding, characterized in that, in order to increase sensitivity and expansion of the scope, it is equipped with a second. magneto-modulation sensor, identical to the first, and two rectifier bridges, each of these nitomodulation sensors are equipped with additional AC windings, the middle core of each magnetomodulation sensor is made in the form of a closed 111-shaped core, magnetically sensitive elements are made in the form of AC output windings and additional AC windings of the magnetomodulation sensor are placed one at a time in the middle rod window of the corresponding magnetomodulation sensor, indicated additional AC winding of each magnetomodulation sensor is connected with the magnetization winding of another magnetomodulating sensor through one of the rectifier bridges, the alternating current output windings of each of the magnetomodulating sensors are connected in series, the terminals of the alternating current windings and the rectifier bridge poles of the same name are used to take output signals.