SU743154A1 - Device for control of reciprocal motion electromagnetic machine - Google Patents

Description

(54) DEVICE FOR CONTROLLING ELECTROMAGNETIC RETURN-MOTOR-TRAFFIC MOVEMENT The invention relates to electrical engineering and can be used in the mining industry for creating powerful electromagnetic impact machines, for building pile breaking, development of frozen soils, etc. Two-loop electromagnetic machines of reciprocating motion are known, which contain electro-magnets, power thyristors, end position sensors, ferromagnetic measles, guide tube 1. The disadvantage of such machines is that with increasing machine power the size of electromagnets and their operation time increase, leads to their rapid heating. The closest to the described invention by its technical essence and the achieved result is a device for controlling a multi-stage reciprocating machine, which contains position sensors, electromagnets, mounted on a guide tube, in which a movable ferromagnetic measles is located. The switching of the motion of the core in different directions is carried out using triggers, a matching device and a pulse shaper opening the power thyristors 2. The disadvantage of this device is its complexity due to the large number of nodes entering it, the difficulty of matching them during operation and lack of reliability. The purpose of the invention is to increase the reliability of the device. This goal is achieved by the fact that two transformers, each of which has n-1 secondary windings with diodes included in them, are introduced into a device for controlling an electromagnetic machine of reciprocating motion with n electromagnets. The primary windings of the transformers include diode bridges with thyristors in the diagonal, the control circuits of which are connected to the secondary windings of the end position sensors containing the diodes. Each of the secondary windings of these transformers, with the exception of one, the first transformer, is connected in parallel with the corresponding secondary winding of the second transformer.

All secondary windings are connected to inserted capacitors in the power thyristor control circuits. The switching thyristor control circuits are connected to the windings of the intermediate position sensors containing the diodes of the secondary sensors JJ. For locking the power iris, connected in series to the windings of the electromagnets, capacitors are connected to their anodes.

Figure 1 schematically shows the device; FIG. 2 is a block diagram, devices where the solid lines show the connections when the core moves in one direction, and the dotted lines in the other; Figure 3 is a circuit diagram in principle.

The device for controlling the electromagnetic machine of the reciprocating motion consists of five strong electromagnets 1J (, 2,3, ..., p), end sensors 2 and 3 positions and intermediate sensors 4 and 5 positions. The secondary windings of the sensors of -2, 3, 4 and 5 positions include diodes b. The movement of the ferromagnetic core 7 in the non-magnetic pipe 8 in both directions is provided by means of end sensors 2 and 3 positions and intermediate sensors 4 and 5 positions. Anchor 7 interacts with working tool 9. Thyristors

10 installed in the diagonal x bridges

11 and 12, the loads of which are the primary windings of transformers

13 and 14. Diodes 15 are included in the secondary windings of transformers 13 and 14. In the control circuits of power thyristors 16; there are chains, each of which is a series-connected capacitors 17 ;, and thyristors 18i. To the anodes of the power thyristors 16; switching capacitors I9i, magnetic field energy quenching circuits consisting of series-connected resistors 201 and diodes 21 are connected, connected in parallel with the windings of power electromagnets 1. Diodes 22 are connected between electromagnets li and power thyristors 1 bi. The entire device is powered by rectifier 23.

The device works as follows. in a way.

For example, ferromagnetic measles 7 is saddled in the right extreme position (Fig. 1). At the same time, it closes the magnetic cores of the end sensor 2 of the position and the intermediate sensor 5 of the position. A control signal taken from one of the secondary sources of the end sensor 2 of the position (Fig. 2) is supplied through diode 6 to the control circuit of the thyristor 10, which is unlocked, and current flows through the primary winding of the transformer 13. The capacitors 17 through the diodes 15 are charged: before the amplitude voltage arising on the secondary

transformer windings 13. At the same time, the control signal taken from the other secondary winding of the same end sensor 2 of the position is supplied to the thyristor control circuit I8i, the latter is unlocked, and the capacitor, discharging through the control circuit of the power thyristor 16n-i, opens it. Through the opening power thyristor 1bp, the winding of the electromagnet Ift-i is connected to the rectifier 23 and a current begins to flow through it. Simultaneously, the rectifier coil 19n .-, 2 is charged through the rectifier 23. Diodes 22 t prevent the discharge of capacitors 19t through the windings of electromagnets. Ferromagnetic ANCHOR 7 begins to be drawn in by the Itt-i electromagnet. As the core 7 is drawn in, its front part emerges from the electromagnet, and closes the magnetic conductors of the following along the core 7 intermediate sensors 4 and 5 of the position, located between the electromagnets 1 c and 1 p-g (Fig. 1), which leads to unlocking the power thyristor 16p-g. , and, therefore, to the connection of the winding of the electromagnet ln-g. g rectifier 23. At the same time, the power thyristor of 16 P- / discharge current of the switching capacitor 19p-d is locked. The closure of the magnetic circuit of the intermediate sensor 5 of the position does not lead to the re-activation of the power thyristor 1bp-), because the capacitor 17 ;, is discharged by the control signal of the end sensor 2 of the position, as a result, a normal mode of operation of the electromagnetic reciprocating machine is provided. As far as the motion and the core 7, the process proceeds similarly. When the korore 7 reaches the leftmost position, it closes the magnetic conductor of the other end sensor 3 of the position. In this case, a state appears in the device similar to that which the end sensor 2 of the position 2 closes. After this, measles 7 begins to move in the opposite direction.

This device simplifies the control circuit of the electromagnetic machine of reciprocating motion, ensures reliable coordination of the device nodes during operation, which increases the reliability of its operation.

Claims (2)

1.Nosovets A.V. Analysis of power supply circuits and control of electromagnetic hammers with forced switching of thyristors. Sat Research of electric power pulse systems, Siberian Branch of the Academy of Sciences of the USSR. Neither. Mining, Novosibirsk, 1974, p. 17-26. 2.Sboev V.M. and Laskov A.A. The control system of a four-section electro-magnetic reciprocating machine. Materials of the All-Union Conference on the Problem of Power Pulse Systems, Part 1, Electric Power Pulse Systems, Novosibirsk, 1969, p. 890 94. and Sh