DE1064600B - Magnet system for shooters - Google Patents

Description

The invention relates to a magnet system for contactors and similar remotely controllable, electromagnetic operated switching devices. In practice it is sometimes desirable that even with a temporary If there is no mains voltage, the contactors remain switched on so that when they come back the voltage does not mean that an entire control system has to be restarted first. So there is, for example Systems in which, in the event of a short circuit, the main switch is extinguished of the arc opens the circuit and then closes it again immediately.

The known contactors, in which the excitation winding of the magnet system is connected to the mains, open at Power failure automatically selects the circuit to be switched by you and speak after the return of the Tension no longer on. It has already been proposed to use time switches, auxiliary generators or the like Provide aids that temporarily keep the contactors in the switched-on state. These switching aids however, they are expensive and require an additional number of control lines.

It is also known to build so-called remanence contactors. The mode of action of this contactor is the following: The excitation winding of the switching magnet is obtained from an alternating current network via a rectifier briefly excited. The laminated core is magnetized by this DC excitation. This magnetization is retained so that the switching magnet remains in the on position. Turning this off Contactor happens with the help of an alternating current of lower amperage. This low alternating current causes demagnetization of the laminated core and thus a drop in the switching magnet. Such Contactors are in themselves suitable, as are the devices they connect to the mains in the event of a power failure on the mains to keep, however, they are for use in control equipment and the like, in which the contactors be switched on and off repeatedly and, if necessary, in rapid switching sequence, cannot be used because Each time the contactor is switched off, an AC circuit with a high level of resistance is switched on necessary. In addition, the expense of rectifiers etc. does not always appear justified.

It is also known to use polarized relays and the like simultaneously with permanent magnets and excitation windings equip. This achieves a high level of responsiveness.

The magnet system according to the invention is characterized by a permanent magnet, the is arranged and dimensioned on one of the magnet parts of the electromagnet so that if the Excitation voltage for the electromagnet of the armature magnetic system for contactors

Applicant:

Siemens-Schuckertwerke
Corporation,
Berlin and Erlangen,
ίο Erlangen, Werner-von-Siemens-Str. 50

Otto Müller, Amberg,
has been named as the inventor

is held in the attracted position, but that the force of the permanent magnet when the armature is lifted not enough to attract the armature, and that electrically effective, the excitation winding extraneous means, which are dependent on the mains voltage, are provided for eliminating the permanent magnets generated holding force as long as the mains voltage is present.

So-called blocking windings are advantageously used as electrically effective means which are not part of the field winding used, which displace or prevent the magnetic flux of the permanent magnet from the pole surfaces. These blocking windings are connected to the network. This means that the switching device with the Magnet system according to the invention works like a normal contactor when mains voltage is present, because the effect of the permanent magnet is constantly canceled by the blocking winding connected to the network. If, on the other hand, the mains voltage fails, the blocking winding is also not energized at the same time When the excitation winding is de-energized, the contactor remains switched on due to the permanent magnet Position.

The invention is illustrated using an exemplary embodiment which is shown schematically in the drawing explained and the mode of operation described.

In the figure, a magnet system is shown in section, which consists essentially of the Core 1, the armature 2 and the excitation winding 3 consists. The magnet system has three poles. The middle pole of the core is longitudinally slotted, and a permanent magnet 4 is arranged above the yoke, which magnetizes the two magnetic parts against each other, whereby the magnetic flux when the armature is attracted The armature closes over the corresponding pole faces so that it adheres to the core.

909 610/301

Claims (3)

The core is constricted between its yoke and the receiving part for the permanent magnet. At this point the core is penetrated by a blocking winding 5-6. If current flows through the blocking winding 5-6 , saturation of the laminated core occurs in the area of the constrictions, which causes the magnetic flux of the permanent magnet 4 to be pushed away from the pole faces, it is forced through the air gap above the constriction. This ensures that the magnetic nut of the permanent magnet cannot act as a holding force on the pole faces. If the blocking winding 5-6 is permanently connected to the mains via a series resistor, in contrast to the control voltage, the switching magnet works completely normally when the mains voltage is present, which is also the control voltage, i.e. when the excitation winding is switched on, the switching magnet is ^{attracted, while in the event of L T interruption} the excitation line the solenoid drops. If, on the other hand, the mains voltage fails when the magnet is attracted, the blocking winding 5-6 is de-energized at the same time as the excitation winding 3 , the magnetic flux of the permanent magnet 4 via the pole faces of the magnet is released, the magnet remains in the switched-on state. When the mains voltage returns, the switching state that was assumed before the mains voltage failure is automatically restored. A magnetic shunt can also be arranged for the permanent magnet 4. Patent claims! ! .Magnet system for contactors and similar remotely controllable, electromagnetically operated switching devices, characterized by a permanent magnet attached to one of the magnetic parts of the Electromagnet is arranged and dimensioned so that when the excitation voltage for the Electromagnet the armature is held in the attracted position, but that when lifted Armature the force of the permanent magnet is insufficient to attract the armature, and that electrically effective means, which are external to the field winding and which are dependent on the mains voltage, are provided are to eliminate the holding force generated by the permanent magnet as long as the Mains voltage is available. 2. Magnet system according to claim 1, characterized in that at least one blocking winding (5-6) is provided which keeps the magnetic flux of the permanent magnet (4) from the pole faces. 3. Magnet system according to claim 1 and 2 with three magnet legs, characterized in that that the core is divided into two parts that an air gap is created along the central leg that the Permanent magnet (4) is arranged at the level of the yoke and that the longitudinally slotted leg is provided with a blocking winding between the excitation coil and the permanent magnet. Considered publications:
German patent specifications No. 874 330, 724 326,
961; U.S. Patent No. 2,441,984;
French Patent No. 1,041,523;
German patent application ρ 12135 VIIIb / 21 c D
(announced on November 8, 1951). 1 sheet of drawings © 909 610/301 8.