DE1725890U - MOTOR PROTECTION DEVICE FOR ELECTRIC MOTORS FOR AUXILIARY OPERATIONS ON ELECTRIC VEHICLES. - Google Patents

Description

Theodor KIBPE- Elektrotechnische fabrik, Düsseldorf-Reisholz

Mptorschutzeinrichtung for electric motors for auxiliary operations on electric vehicles

The object of the innovation is a motor protection device for Electric motors for auxiliaries on electric vehicles. However, it is not limited to electric motors, but rather Can also be used for other electricity consumers with a gate part to avoid strong switch-on currents in the event of temporary to avoid short-term or long-term power interruptions, through which the switched-on consumers, in particular electric motors, can be damaged.

It is known that in particular in electrically operated rail vehicles, cranes or the like. When removing the Driving current or operating current from a contact wire or Conductor line short-term or long-term power interruptions occur. These power interruptions occur ζ.B, when driving over so-called section separators, by so-called. Stirrups dance or as a result of the sliding pantograph being pushed out from the contact wire or power supply line.

Well within an electrically operated rails or railless vehicle or a crane system often numerous auxiliary machines, e.g. converters, drives for

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Korapressoranlagen or the like. Provided that are switched on once by hand at the start of operation and then seibat be left. Now the external power supply is turned off temporarily interrupted the reasons mentioned above, so occur when the power supply is restarted for these power consumers, which usually have a very low internal resistance, very strong electricity, which the Multiples of the normal power consumption during the operation of these consumers. One has already through so-called Overcurrent switch or the like. Attempts to remedy this drawback remedy in order to prevent damage to consumers, in particular these auxiliary machinery. However then had to in each case after these auxiliary machine sets have automatically switched off which are switched on again by hand, which was often not only forgotten, but in each case an additional lätiglceit of the vehicle or crane driver claimed.

These parts of the known Schutzanosünungen are through the new protective device is eliminated and the loads are automatically switched on again without this a current overload occurs. The arrangement can be as follows be taken that in per se harmless very short-term Current interruptions the arrangement according to the invention does not respond and the electricity consumer is normal remains switched on.

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The new protective device consists of a main current exciter winding parallel to the armature winding or to the series circuit and armature winding of an electric motor arranged excitation winding of a switching relay, which are in series with a V / resistance is arranged, the switching contact of the relay parallel to one with the motor armature "or with the Serlensehaltung from main current exciter winding and armature winding of the electric motor arranged in series resistor is.

Here are the excitation winding of the control relay and the with Measure the resistance in series and the switching contact of the switching relay arranged so that this switching contact is closed when the motor is running normally and continuously short-circuits the resistor connected upstream of the electric motor.

In order to avoid having the new facility even with very responds to short-term, inherently harmless power interruptions, the switching relay can use one of the respective Be equipped with a switch-on or switch-off delay that corresponds to the operating conditions. This can be done, for example, by connecting them in parallel a capacitor for the excitation winding of the switching relay can be achieved.

The new facility can also be used to protect any Power consumers that have a low internal resistance when de-energized can be used with advantage.

The drawing shows an exemplary embodiment of the new protective device shown and their mode of action explained on it.

A lift switch, main current or compound motor may be connected to the annual wire line bgvv via a manually operated switch 10 and via a fuse 11. Conductor line 8 and to the return line, for example rail, IJräe or the like. Be connected. In series with the armature winding 1 hz \ s. A fixed resistor 6, which can be set once according to the operating conditions, is arranged along the armature winding and the main stroia exciter winding 2 of the electric motor. In parallel with this resistor 6 is the switching contact 5 of a switching relay, the excitation winding 2 of which is in series with a higher resistance 4. This series connection of the excitation winding 3 of the switching relay and the resistor 4 is parallel to the armature winding 1 or to the series connection of armature winding 1 and main excitation winding 2 of the electric motor.

If the contact 5 and when the manual switch 10 is closed, the current is suddenly closed again, so the electric motor receives its current following? / ege:

Contact wire 8 - fuse 11 - switch 10 resistor 6 - main current winding 2 - armature winding 1 - iürde 9.

The engine starts to run. This increases the anchor 1 generated counter-BMiC gradually and eventually reached a voltage value at which the excitation winding 3 over the

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Resistor 4 is so strongly excited that the switching relay 3 responds and its contact 5 soles against the action of a spring. The series resistor 6 is short-circuited and the electric motor receives its full operating current. The relay 3 holds itself so that the contact 5 is permanent remains closed.

binds a power interruption of shorter or longer Duration instead, the back EMF generated by the motor drops. As a result, the excitation of the winding 3 of the switching relay drops so that it may no longer be sufficient To keep contact 5 closed against the action of the peder, contact 5 opens. When reinserting the Power supply for the electric motor is therefore again the circuit already shown above, so the motor can start up again safely without a too strong current surge occurring.

In many cases, these power interruptions last, e.g. when driving over section separators or when dancing the iron or Like. Only a short time, so that the electric motor is still running and a zv? ar gradually decreasing G-egen EMF is still generated, which is still large enough when the power supply is re-established to prevent an excessive switch-on current surge. In this case, the hold relay 3 does not yet need to be closed works. If the voja motor generated counter SMK falls below a arbitrarily selectable measure, the relay would drop out immediately. Purposes of varying this time of absence

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parallel to! excitation winding J> AEEA Schaltrelaie a capacitor 7 can be arranged, an additional bond and the Aussohaltverisögerung Schaltralais is effected by ami. Instead of a capacitor, this can also be used. other delay means known per se, for example copper washers or the like, can be used. Retarders that are known per se can also be used for this purpose.

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Claims (5)

S ο h u t ζ a η s ρ r ti ο Ii e 1. Motor protection device for electric motors for auxiliaries on electric vehicles, characterized that parallel to the armature winding (l) or, to the series connection of the main current exciter winding (2) and armature winding (1) of the iülektrojaotors the exciter winding (3) A switching relay is arranged in None with a resistor (4), and the switching contact (5) of the relay is arranged parallel to a resistor (6) located in front of the electric motor. 2. Motoraclmtzeinrichtung according to claim 1, characterized in, that the contact (5) "with normal running of the Motor is closed. 3. Motor schutaeinrichtung according to claim 1 and 2, characterized marked »that the Öchaltrelais {'5) has a bin and switch-off delay. 4. Motorachutzeinrlchtung according to claim 1 to 3 »thereby characterized in that a capacitor (7) is arranged parallel to the excitation winding (3) of the switching relay. 5. Motor schuta device according to claim 1 to 4, characterized in that that they can control any electricity consumer serves.