DE300430C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

- JVe 300430 CLASS 21 c. GROUP

Remote control for several electric motors. Patented in the German Empire on September 10, 1915.

To use electric motors remotely in different directions of rotation to be able to switch only one contact wire, one uses relays, the z. B. at different voltage take different switch positions. One or the other The switch position then enables the motor to be switched on in one way or the other Direction of rotation ".

ίο With such relays can ge by a stationary control apparatus also a plurality of motors in different rotational ^direction: to be switched on, if it is provided a contact wire and a relay for each motor. With the present circuit, however, it is also possible to control several motors via the same contact wire.

In the figure, such a circuit is shown for two motors, but only one Power supply and a fixed control apparatus is necessary. The control relays work not directly on the contactors or the electromagnetically operated changeover switch, but they only serve to close the excitation circuit of other control relays, which in turn supply the contactors with electricity. .

The control relays should be referred to as first and second order (contactors). The first order control relays R ¹ are used to prepare the switching of one or the other motor, while the second order (R ² and R ^2a ) close the excitation circuit of the contactor for one or the other direction of rotation.

The first-order relay R ^{1 selected} is one which can assume two different positions depending on the voltage supplied to it from the stationary control apparatus. If a low voltage is supplied, armature 10 remains in the position shown so that armature 2 can only move upward until stop 9 strikes armature 10. At a higher voltage, however, the armature 10 is withdrawn and the armature 2 can move up to the highest position. Depending on the position assumed by the armature of the relay, one or the other of the second-order control relays (T? ² and R ^2a ) is now energized, which then switch on the contactor S ¹ or S ² for one or the other direction of rotation of the motor. Polarized relays are selected as second order relays (R ² or R ^2a ) , which assume different switching positions when the current direction changes. Of course, a relay of the latter type could also be used as a first-order relay and the first-order relay could also be used as a second-order relay. The essence of the control is that from the fixed control switch K , the first-order control relays are brought into certain switching positions by choosing the means mentioned or similar, or the excitation circuit of the second-order relay is closed, which then after taking the appropriate

Actuate one or the other contactor switch position and thereby switch the motor into switch on one or the other direction of rotation. It is important that the Optionally, the control process must be completed before the actual switching process for the Motor starts and that the control relay is switched off at the same time as the motor is switched on will.

ίο In the figure, the circuit for a motor is now drawn from the relay of the second order T? ² is operated, while relay R ^2a belongs to a zAveiten motor whose circuit is exactly the same and which is therefore not shown in order not to unnecessarily complicate the circuit diagram.

The stationary control switch is marked with K , from which current, different voltage and direction can be given via / or g according to F (contact wire) or G (rail). Instead of one control switch, two, one for each motor, can of course also be used. With the control switch, both motors can be started in one or the other direction of rotation and their speed can be regulated, directly on a scale, without the operator having to do any further manipulations as with a normal control switch.

Two roller linings H ¹ and H ^{2 are} provided. In the middle between the two, the two common resistors W ^x to W ³ and the contact fingers are drawn. The roller covering H ¹ is used for switching the motor M, while H ^{2 is} for the motor, not shown, which is controlled by relay T? ² "is switched off. H, h ¹ , h ² are. Auxiliary contacts, the purpose of which will be explained later.

The operation of the control is as follows: If the roller of the control apparatus K is turned to the right so that the contact fingers fall into the row of the covering H ¹ marked with O , then the switching process for the motor M is prepared. If the control roller is now moved further so that the row of contact fingers coincides with position 21, then flows from the "+ pole to g, auxiliary contact h ¹ , h, h ² to line G and from the pole via f,

W ¹ to W * after F current. The resistor W ¹ , which is dimensioned so that it throttles about 50 percent of the voltage, is short-circuited by the segments of the receipt H ¹ , so that from / ⁷ almost the full voltage through 6 through coil 1 and 11 of the relay R ¹ , Auxiliary contacts 16, 15, 14 to G flows. As a result, the lock 10 is withdrawn and the relay armature can assume its highest position, so that contact 3 comes into contact with contact finger 5.

It then becomes a circuit from G (+ -Pol)

14, coil 20, 5, 6 made according to F ( pole).

This is the contact 29 of the relay T? ² moved to the left or right, depending on whether the row of contact fingers is in position 21 or 25. Contact 29 comes into contact either with contact 30 or 31, which are connected to the excitation coils 7 and 8 of the contactors S ¹ and S ² , respectively.

If the armature of the relay R ² z. B. to the left at contact 30, current flows from F, contact 6, 5, contact 29, 30, coil 7 of contactor S ¹ , 14 to the right contact fingers of contactor S ² to G. Contactor S ¹ • (coil 7) starts.

The motor circuit is then established as follows. Current flows from F via the outer left contact finger of the contactor S ¹ , through the armature of the motor M and via the outer right contact ^{finger of the contactor Jv 1} to G. The field is on the one hand also on this outer right finger of the contactor S ¹ and on the other hand over the middle contact finger of the contactor S ¹ and the left outer contact finger of the contactor .S ² to F.

When contactor .S ¹ starts, the connection to coil 8 of contactor JS " ^{2 is} interrupted via contacts 16, 17 so that it cannot open. The excitation circuit of relay R ^{1 is also} interrupted at middle auxiliary contact 16. The armature of Relay R ¹ therefore falls back into the rest position, and as a result, coil 20 of relay R ² is also de-energized due to the interruption of contacts 5, 6 and here switches off the excitation of coil 7.

The excitation coil 7 of the contactor S ¹ is, however, connected directly to the controller K via F, outer left contact finger of S ¹ , auxiliary contacts 18, 7, 14 at G. The contactor .9 ¹ switches off, therefore only when the control switch K is turned to the zero position.

But if the control switch K is turned so that the contact fingers are in position 25

stand, G will be at the pole, F at the

+ Pole placed, and the direction of the current in the coil 20 of the relay R ² is reversed.

As a result, the contact 29 of the relay R ^{2 is} pressed to contact 31 and coil 8 of the contactor S ² receives current, so that the motor starts in the opposite direction of rotation as described above. The switching process is detailed, as described above for contactor S ¹ , here for contactor S ² .

The motor M is thus switched on by contactor S ¹ or S ″ in one or the other direction of rotation, depending on whether the row of contact fingers is in position 21 or 25. By gradually switching off the resistors W ² , W ', it can then continue to rotate

The number of revolutions of the motor connected directly to the controller K can be regulated by the control roller up to the positions 24 and 28, respectively.

Is not intended to motor M, but the second (not shown) motor are turned on, the direction of rotation is determined by the switch position of the relay R ^2a, after the latter λνωτίε previously turned on by the relay ^R1, so the contact fingers row on the roller covering H ² must be provided. Here the resistor W ^{1 is} switched into the circuit when the switching movement is initiated, since the contact finger connected to the upper end of the resistor W ^{1 is} not in contact with the contact segments of the roller H ² in the positions 32 or 36, so that a current is approximately half the voltage to relay I? ^{1 is} sent.

The relay R ¹ can therefore not reach its highest position, but only so far until the stop 9 hits the lock 10. Then current flows from F, 6, 4, 12, 13,. Coil 20 ^{a of} the relay R ^2a according to G. As a result, depending on whether the row of contact fingers is brought to position 32 to 35 or 36 to 39, F ΐ3Ζλν. G placed on the + - or pole and, depending on the direction of the current, contact 29 "- placed on 30"'or 31 ".

Depending on the position of the contact 29 'is represented y ^a coil of the one or coil ^8a of the. Other contactor is turned on the rest, the circuit design. "Just as in the motor M.

In order to avoid that, when lifting of the armature 2 of the relay R ¹ and driving with full .Connect voltage (that is on the roller covering Ii ¹⁾ at the transition of the contact 3 via contact fingers 4, the relay R ^2a is responsive, the relay R ^2a is an inhibition On the other hand, this inconvenience can also be avoided by arranging an auxiliary contact on the armature 10 of the relay R ¹ , which opens the relevant excitation circuit before the contact finger 4 comes into contact with contact 3.

As can be seen from these explanations, one or the other motor can be switched on in any direction of rotation using only one line (if G is interpreted as a running rail) and the number of revolutions can be controlled at the same time according to a scale arranged on the control apparatus.

The meaning of the contacts h, H ¹ J h ² remains to be explained.

These auxiliary contacts sit on a special small AValze that interrupt the circuit to F or G when the control switch is turned from the switch positions of one motor (H ¹ ) to that of the other (H ² ), so that only from one or the other zero position can be switched off. This can e.g. B. achieved in that when switching from surface H ¹ to Ii ^2, the auxiliary roller is decoupled from the main roller by a stop and is only coupled again to the main roller in the two middle (o) positions. '

Claims (2)

Patent Claims: 1. Remote control for multiple electric motors under. Use of contactors, characterized in that the contactors (7,8) for each motor are influenced by two groups of control relays (R ¹ and R ² ) , of which each relay of the first group (R ¹ ) consists of a relay with two Switch positions of the relay armature and is supplied from a stationary main control switch (K) with current of different voltages for the two switch positions, while the relays of the other group (R ² ) are switched into an excitation circuit by the relays of the first group (R ¹ ), in which there is a determined by the position of the stationary Hauptsteuerschal- _go ters (K) .Stromrichtung, whereby they are automatically brought into a switching position which corresponds to the respectively set on the main control switch position, .and that after completion of the switching operation of the control relay (T ? ¹ and R ² ) the excitation circuit of the relevant contactor (7 or 8) is closed and at the same time that for the control relay un is broken. 2. Remote control for several reversible electric motors with contact roller covers for the motors to the extent of a common. Contact-. roller of the main control switch, characterized in that the transition from a zero position of one roller occupancy (H ² ) of a motor into the zero position of the roller occupancy · (H ¹ ) of another motor z. B. by means of auxiliary contacts closed shortly before the zero position (/ ?, h ¹ , h ² ) without current. 1 sheet of drawings.