DE202366C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

There are circuits for electrically operated points and other adjusting devices known, in which the motor after completion of the actuating movement and shutdown of the Operating current is short-circuited in itself, so that he, acting as a dynamo, a him generates self-braking electricity and quickly comes to a standstill. Remains this Short-circuit received while the motor is at a standstill, it prevents an unintentional The motor can start up due to external currents that accidentally enter the motor line.

On the other hand, circuits are known through which after the motor movement has ended the occurrence of the short circuit is made recognizable by a monitoring sign or by releasing a block will; however, these devices are such

procure that when this monitoring symbol occurs, the motor is short-circuited is canceled again, and also a monitoring of the Switch end positions not available due to a quiescent current. So the only choice was the permanent protection of the stationary motor against the influence of external currents and to bring about the monitoring of the turnout end positions by a quiescent current, or monitor the occurrence of the short circuit that only causes the motor to brake and to forego the first two effects.

The subject of the invention is a circuit which carries out the three named processes brings about.

Fig. Ι shows the arrangement in one of the two rest positions. Five contacts u ¹ , u ² , e, b ¹ and b ² are arranged in the interlocking. The contacts u ¹ and u ² are operated by the setting lever s. At the same time, contacts b ¹ , b ² and e are folded over, but contacts b ¹ and e are moved back in a manner known per se by attracting the armature of monitoring magnet k ¹ , while contact δ ² by attracting the armature of a newly inserted magnet ä ^{2 is covered} by low resistance. On the switch drives two contacts α ¹ , β ² are arranged in a known manner, one of which is always turned over immediately after the start of the actuating movement by the Mortor or the parts moved by him (in the drawing by the rail t) to the line for to connect the retrieval of the switch from the intermediate layers. The second contact is also switched in a known manner after the end of the actuating movement by the rail t , so that the circuit for resetting the switch is made available and the monitoring current is switched on.

The motor is provided in a known manner with two field magnet windings w ¹ , w ² , one for each direction of rotation. The contact b ¹ makes the connection with one end pole of the

Power source ζ, i.e. for the high- ^{voltage current, but contact 5 2} only switches on part of the battery z, i.e. the low-voltage current. Otherwise, the circuit is shown in the figure.

To make the overview easier, the lines in FIG. 1 are represented in different ways differentiated. The faint lines mean the unused,

ίο the weakly dashed those of the weak Monitoring current flowing through, the strong 'dash-dotted lines for the short circuit of the Motor lines.

So it flows in the rest position according to Fig. Ι

the weak monitoring current from the current source ζ through the switch b ^% , u ¹ , the line 1, the switch ä ¹ , the line 3, the monitoring magnet k ^{1 back} to the current source ζ . At the same time, a short circuit of the motor is brought about by the circuit: motor m, switch α ² , line 2, switch w ² , auxiliary magnet k ² , switch e, line r, motor m. The magnet k ¹ has attracted its armature, as a sign that the switch has reached its end position, and the motor m is in the short circuit.

Fig. 2 shows the state after turning the locking lever s, the switch u ^1, u ^2, e, δ ^1, δ ² moves, characterized k the monitoring magnet ¹ withdraws his current and the armature of both magnets k ¹ and k ² stands out. The strongly drawn out lines are used to identify the lines through which the actuating current flows.

The actuating current thus takes the path: current source z, switch δ ¹ , u ¹ , line 2, switch α ² , winding w ² , armature m, line r, current source z.

Immediately after the start of the motor movement, the switch a ¹ is thrown in the known manner, thereby securing the turning back of the switch from every intermediate position. Otherwise nothing changes in the circuits.

At the end of the movement, as shown in FIG. 3, switch a ^{2 is also turned over} by the motor. The actuating current then no longer flows through the motor m, but rather through the strongly dashed lines through the monitoring magnet k ¹ . The circuit is readily apparent from the figure. The magnet k ¹ now attracts its armature and thereby converts the contacts δ ¹ and e (Fig. 4). Instead of switching on the weak monitoring current, as in an older system, the short-circuit circuit (heavily dash-dotted) for the motor closes through contact e , and since it continues to run by virtue of its persistence, i.e. generates current, and into the circuit of the Auxiliary magnet k ^{2 is} switched on, it immediately attracts its armature and thereby puts the contact δ ² back. As a result, however, the weak monitoring current (current source z, switch δ ² , u ¹ ,, line 2, switch a ² , line 3, monitoring magnet k ¹ , current source z) is closed without the short-circuit circuit being canceled (FIG. 5). The second idle state is hereby reached. The monitoring current can only occur if the short-circuit circuit is in order, since the flow of this current determines the effect of the magnet k ² and thereby the closing of the contact b ² .

If a device go is to be connected to this circuit through which the monitoring magnet k ^{1 is} short-circuited during the actuating movement so that an incorrect monitoring signal is not emitted by external currents, the device can be made to close this too Short-circuit circuit is monitored.

As FIGS. 6 to 10 show, instead of the switches u ¹ , u ² three u ¹ to u ³ and instead of the two switches a ¹ , a ² two pairs of switches a ¹ , a ^z and α ² , α ⁴ are arranged. In the rest position according to FIG. 6, the weakly dashed monitoring current flows through the monitoring magnet k ¹ . This takes the following course, in that it branches in part on two parallel paths: current source z, switch δ ² , u ¹ , line i, switch a ¹ , line 3, magnet k ¹

Line 4, switch a ^l

Switch u ³ , e, magnet k ² , switch u ² , line 2, switch α ² , motor m

Line r, power source z. At the same time, the following short-circuit circuit for the motor is closed (denoted by dash-dotted lines): motor m, switch a ² , line 2, switch u ² , auxiliary magnet k ² , switch e, u ^s , line 4, switch α ⁴ , motor m If the control lever s is thrown, the monitoring current is interrupted, and the control current indicated by strong lines in FIG. 7 flows through the motor.

Simultaneously, the short circuit identified by weak dash-dotted lines is closed for the ÜberwachungsmagnetenÄ ^1: Magnet k ^1, u ^z switch, e, r line switch β ^4, line 4, magnet k. ¹

At the beginning of the movement, the pair of switches a ¹ , a ^z , ζήτα conclusions, the pair of switches β ² , β ^{4 is turned over} by the motor. The current indicated by strongly dashed lines in FIG. 8 then flows which causes the magnet h ¹

^

lets his anchor tighten. As a result, the contacts b ¹ , e are turned over (Fig. 9), the battery current stops, and the short-circuit circuit for the braking current of the motor is formed (heavily dash-dotted): Motor m, switch a ¹ , line 1, switch w ² , Auxiliary magnet A ² , switch e, u ³ , line 3, switch a ³ , motor m. The magnet k ² attracts its armature, puts the contact δ ² around (FIG. 10), and it

The monitoring current now flows (weak dashed lines), while the short-circuit circuit also flows of the motor (strongly dash-dotted) is closed.

When the braking current in Fig. 9 occurs

has come and has switched on the monitoring current, the proof is provided that the line 3 and the contact a ³ , which are formed when the switch is subsequently reset, i.e. when the symmetry of FIG.

• The end position of the parts for the short-circuit of the monitoring magnet are in an operational state, because the braking current (Fig. 9) must also have this line 3 and this contact a ³

flow through. The monitoring current from FIG. 10 (weak dashed lines) would not suffice for this control because, as was explained with reference to the symmetry position according to FIG. 6, a parallel path is also available to it in addition to the line 3. The braking current in FIG. 9 also monitors the control line 1 which comes into effect during the subsequent resetting and its contact a ¹ (symmetry to FIG. 7), which are also not monitored by the monitoring current in FIG. 10 for the reason just given.

If you want to make this monitoring permanent, you can use the auxiliary magnet k ² with correspondingly low resistance as a monitoring magnet, because part of the monitoring current (Fig.

10) flows continuously via switch u ³ , e, magnet k ² , switch m ² , line 1, switch a ¹ and motor m .

Instead of having the switching on of the braking or short-circuit circuit (FIG. 9) caused by the switch e operated by the monitoring magnet _ k ¹ , a special motor-controlled contact a ^s (FIG. 11) can be arranged on the switch mechanism itself for this purpose is connected to the film magnet k ² by a special line 5. 11 shows how, in one rest position, the monitoring current indicated by a weak dashed line flows through the magnet k ¹ and the braking circuit of the motor m, indicated by a dotted line and containing the hoof magnet k ² , is closed. If the lever s is thrown, the motor m receives current through switch b ¹ , u ¹ , line 2, switch a ² and winding w ² , and at the same time as switch a ¹ becomes switch a ⁵ through the rail t of the motor at the beginning of the movement so that it is in the contact-free central position, in which it remains open, just like switch e in FIGS. 2 and 3, until it is further thrown at the end of the movement simultaneously with switch a ^{% and thereby} the connection of the line 5 restores.

Claims (1)

Patent claim: Circuit for electrically operated turnouts with closed-circuit current monitoring and with a device for short-circuiting the motor in the rest positions, characterized by an electromagnet (k ² ) which is excited by the braking or short-circuit current of the motor fm) occurring after the changeover is complete and by the Attracting its armature switches on the continuous weak monitoring current. For this purpose 2 sheets of drawings.