SU957312A1 - Method of checking pulse relay with magnetic reed relay memory - Google Patents

Description

(54) METHOD FOR CONTROLLING PULSE RELAYS WITH MAGNETIC MEMORY ON HERMONES

one

The invention relates to electromagnetic switching technology and can be used to control the characteristics of impulse relays with magnetic memory on reed switches (ferrides) in the course of their development and production.

Known methods for controlling ferrides include exciting their windings (windings) with control current pulses of various amplitudes and durations and registering the contact closure process. These methods show the magnetically moving force values of ferrides determined for a number of control current pulse tj values , In this case, the choice of t values (for example, 50 µs, 2 ms, direct current) was made without taking into account the dynamics of contact triggering. In particular, from the following data according to these methods, it blows that the magnitude of the MDS response of the ferrides decreases with increasing 20 and 2.

However, in the area of pulse durations, control current currents close to the time tj before the first contact impact when the MDS triggers, the tripping may increase with increasing pulse duration. The neglect of the dynamics of contact operation during monitoring leads to a lack of objectivity in determining the characteristics and, consequently, the selection of the operating current of the relay control. In addition, the known control methods do not make it possible to predict the vibration impact resistance of the contact system in the memory mode without the use of special means.

The purpose of the invention is to increase the reliability of determining the characteristics of pulsed relays with magnetic memory on reed switches, as well as expanding the functionality of the method.

This goal is achieved by the fact that when the relay is monitored, the duration of the control current pulses is set close to the time t, before the first collision of the reed switch contacts when triggered.

For a more objective assessment of the MDS, the number of its values is determined by setting the duration of the control current pulse each time so that it falls within the interval (0.7 + t)), where t) is the time until the first contact of the reed switch contacts is triggered found during the previous measurement, and taking the initial value tj to take the time until the first contact impact, determined with a control current pulse duration greater than i and MDS windings equal to the MDS of the relay corresponding to this pulse duration, and then finding nym values m actuation MDS MDS determined maximum. In addition, setting the duration of the control current pulses in the interval (l ± 0.3) t), but not longer than the time of the beginning of the contact bounce after the first impact, according to the time and nature of the contact vibration at the time of operation, is judged from the vibration impact resistance of the contact system of the relay memorizing. When the durations of the control current pulses are approximately equal to the time before the first impact of the contacts when they are triggered, the latter collide, have the maximum kinetic energy acquired under the action of the MDS winding, and the electromagnetic force generated by the residual magnetic flux of the memory element counteracts their vibration. . Therefore, controlling the duration of the control current pulses when monitoring the relay in accordance with the time of the first contact collision when it triggers improves the accuracy of determining the MDS response, the contact vibration time, etc. of the relay characteristics, and also predicts the vibration resistance of the contact system of the relay in the memory mode. FIG. 1 shows a block diagram of an apparatus for implementing the method; in fig. 2- dependences of the vibration time of contacts tj; Ha FIG. 3 - static electromagnetic Fg and mechanically opposed FH characteristics of the relay. The control method is carried out as follows. The control winding 1, enclosing the memory element 2, is driven by control current pulses from the pulse generator 3, which makes it possible to adjust the duration and amplitude of the pulses. At the same time, the device 4, for example, a two-arm oscilloscope synchronized with generator 3, controls the current in the winding 1 and the current in the reed switch circuit 5 containing the power source 6. According to the current in the reed switch circuit, the closed and open state of its contacts is fixed, the time of contact vibration is measured and its nature is observed. To control a particular parameter of the relay, the time until the first contact of the contacts tj is measured and the duration of the pulses of the control current is set at the appropriate interval depending on t. So, to determine the maximum MDS response from the duration of control current pulses t, which is observed in the interval 0.7 t, first, the relay MDS and its corresponding time t are determined at a value of t, for example, exceeding the total contact time (t, -ftj). Then the pulse duration tj is set in the interval (0.7-1) of the value of t found during the previous measurement, and the corresponding value of the MDS is determined, while fixing the new value of t, which depends on both the winding MDS and 1 „t,) and on the duration of the control pulse. Correction at each subsequent measurement of the value of t, find a number of MDS values of the relay, which determine its maximum. The existence of such a maximum is confirmed by the course of the curves (Fig. 2), which show the dependence of the vibration time tB of the contacts of a pulse relay with magnetic memory on reels of type CEM-2 on the duration of control current pulses t at two MDS windings. curve 7 is for 1.17 Iwc (4i, and curve 8 is for I-WK 1.67. p, where the .n is the MDS value of response, determined at and t, + tp. As you can see, curve 7 has a gap in the interval 1 c from 120 to 150 MKS (for 1 1.17 Iw & po and 1 1 tj, the value of tj is 150 µs). In this interval of tn values after the first collision, the contacts diverge and do not close again (the time of vibrating is infinite, the memory function This is not performed), which indicates an increase in this area of the MDS trigger, i.e. the minimum MDS at which the memory function starts to perform. With large current values control (curve 8), if the parameters of the memory element of the relay are selected correctly, the vibration time is finite for all values of i. From the graphs in Fig. 2 it can also be seen that at t ≈ approximately equal to t, the contact time t a pronounced maximum, which is due to the fact that the contacts collide with the maximum kinetic energy imparted by the electromagnetic force generated by the control winding, while their vibration is counteracted by the smaller force created by the residual magnetic flux of the memory element. Thus, with pulse durations 1 m m (l ± 0.3) t | but not large for the time of the start of contact rebound after the first hitting rhenium, conditions are created for the contact system similar to the effects of mechanical shock and vibration loads in the memory mode. Therefore, while observing the indicated ratios between tn and t, in terms of duration and nature (decay rate, number of observed bounces, ratios between the durations of the closed and open states of the contacts, etc.). contact vibrations at the time of actuation, one can judge the vibro-shock resistance of the contact system in the memory mode. Thus, analysis of curve 7 (Fig. 2) shows 4fo with an MDS winding IWK 1.17 Ic | .iiH any duration of control pulses the memory element of the relay does not provide storage of the memory (closed contact state), if the value of contact bounce under exposure to mechanical loads is commensurate with the magnitude of the rebound obtained at t 120-150 ISS.

The operation of the pulse relay at 1.17 1 ls1xpp is shown in FIG. 3, which shows the dependence of the electromagnetic force on the size of the gap between the contacts with the control winding turned on - curve 9, the dependence of the electromagnetic force created by the memory element when the control winding is turned off - curve 10 and the mechanical countercurrent characteristic of the reed switch - curve 11. When the winding is excited, operation of the relay, i.e., the change in the gap from the initial bNDO of the final & k, since for all values of the gap the electromagnetic force (curve 9) is greater than the mechanical opposing sludges, and under the action of the difference of these forces are accelerating contacts, acquiring kinetic energy supply. After the control winding is turned off, the electromagnetic force of interaction of the contacts is determined by curve 10: In this case, the gap between the contacts as a result of their rebound exceeds the value 6i, where the electromagnetic characteristic (curve 10) intersects with the mechanical countercurrent (curve 11), which begins to prevail, causing a further discrepancy contacts. The contact system of the relay behaves in the same way with an incorrectly chosen memory element or with an insufficient amplitude of the control pulse and the memory mode as a result of the action of mechanical loads. The stock of the kinetic energy of the contacts during their collision can be adjusted by changing the pulse duration tn within the interval.

The use of the proposed method makes it possible to increase the reliability of the operation of the magnetic memory on the reed switches in a wide range of control pulse durations due to a more objective selection of the operating control current. Besides

Moreover, the method makes it possible without the use of special equipment when testing the relay, including in mass production, to predict the vibration impact resistance of the contact system in the memory mode.

Claims (3)

Invention Formula . A method of controlling impulse relays with magnetic memory on reed switches, consisting in exciting the windings (windings) of a relay with control current pulses of various amplitudes and registering the contact closure process, characterized in that, in order to increase the reliability of determining the characteristics of the relay and extend the functionality of the method, the duration the control current pulses are set close to the time i before the first impact of the reed switch contacts when triggered. 2. A method according to claim I, characterized in that a number of relay switching MDS values is determined, each time setting the control current pulse duration to be approximately (0.7 + l) ti, where tj is the time until the first contact of the reed switch contacts is triggered determined at the previous measurement, and the initial value t, takes the time until the first contact impact, determined when the control current pulse duration is greater than t,, MDS windings equal to the MDS of the relay corresponding to this pulse width, and then from the found values of M On actuation determined maximum MDS. 3. The method according to claim 1, characterized in that, in order to predict the vibration resistance of the contact system of the relay in the memory mode, the duration of the control current pulses is set approximately in the interval (1 ± 0.3) t ,, but not more than the time of the start of contact rebound after the first impact, both in time and the nature of the vibration of the contacts at the time of operation, judges the vibration resistance of the contact system of the relay in the memory mode. Sources of information taken into account in the examination 1.Dikovsky Ya. M., Kapralov I. I. Magnetically controlled contacts. M., “Energie, 1970, p. 132-134. 2.Denisov A.G. and others. Ferrides. M., "Informelectro, 1972, p. 21. rL at m8 f -Sh / -t111g cf / fffffff ffff ff (corner / fug. 2 / ABOUT (7 / (Pt / 3.J