DE586883C - Arrangement for feeding single-phase collector rail motors - Google Patents

Description

GERMAN EMPIRE

ISSUED ON OCTOBER 26, 1933

REICH PATENT OFFICE

PATENT LETTERING

CLASS 201 GROUP

2olS 292.

Patented in the German Empire on January 24, 1930

The invention relates to a particularly useful one Arrangement for the supply and regulation of single-phase collector motors. To regulate the speed of these motors, a voltage is required that is between

1. see a maximum value and a minimum value, which, however, still deviates considerably from the zero value, are continuously regulated can. A regulation down to zero, however, is usually not necessary because the single-phase traction motor already absorb a considerable voltage when starting is able to without losing the starting current exceeds the permissible limit.

In order to supply the motor with the described, finely adjustable voltage, you could either use a step transformer with a lot of steps or

-. also a single-phase rotary transformer .in

ao series connection with an ordinary transformer. These arrangements .fall but very large, and their price is in proportion to the price of the single-phase railway engine a very high one.

In itself it is already known about one Single-phase transformer thereby producing a controllable secondary voltage · that on an additional magnetic leakage path is provided for the transformer and that In addition, auxiliary windings that can be regulated via resistors are arranged, whose current is a Displacement of the magnetic flux generated by the primary winding from the secondary winding brings about in the scattering path.

The invention now consists in the use of such a known per se, of A three-legged transformer fed by a single-phase network for feeding single-phase collector rail motors with an adjustable voltage. There is one on one leg 4 ″ of this transformer Winding that is connected to adjustable resistors, while the secondary winding of the transformer on the other two legs (expediently to the same * 5 Divide) is distributed and its primary winding on one of these two other legs is housed. The use of the transformer described brings just for Single-phase railway motors have considerable advantages, especially over the known ones Arrangements. First of all, there is the advantage described above that the transformer meets the operating requirements of the single-phase locomotive engine adapts particularly well. Another very important advantage consists in the fact that the transformer is quite normal in terms of its structure Has the design of a three-legged transformer and is accordingly particularly insensitive against the vibrations that constantly occur on locomotives.

*) From the patent seeker. Has been indicated as the inventor:

Dipl.-Ing. Jaroslav Kozisek in Berlin-Charlottenburg,

This advantage, especially compared to the recently used, also applies to the supply Thrust transformers proposed by single-phase railway motors come to light, in which it is known Iron cores are shifted against each other and slide together with the active iron sheets.

Another advantage is that in the windings carrying the motor current at all

to no switchings are made while the previously known locomotive transformers have extensive and expensive switching devices in this regard. The regulating device to the.

In contrast, iS ohmic resistance is considerable Easier and cheaper, since you have electricity and voltage on the for in particular the regulation can bring favorable step values, while in the known arrangement are determined by the conditions on the engine.

The drawing illustrates a circuit of the three-legged transformer. 6 is a single-phase railway motor which is fed via the three-leg transformer from the two lines 7 of the railway network. The primary winding ι is accommodated on the middle leg of the three-leg transformer, the secondary windings 2 and 3 on the middle and right leg and the auxiliary winding 4, the current of which can be regulated by means of the ohmic resistors 5, on the left leg. The primary winding of the transformer creates a magnetic flux that closes over the other two legs. The auxiliary winding 4 now serves to displace this magnetic flux by forming a short-circuit current from the limb of the auxiliary winding onto the limb with the winding 3. Accordingly, the secondary windings 2 * and 3 of the transformer are then permeated by a larger flux, and their voltage increases.

When starting the auxiliary winding 4 is open, so that that of the primary winding The flux generated is distributed half over the right and left thighs and accordingly a relatively low voltage is induced in the secondary winding. In order to increase and regulate this voltage, the ohmic resistance 5 is gradually increased switched on, if necessary up to a short circuit in winding 4. In this case the flux generated by the primary winding 1 closes almost completely over the right Leg, and the voltage delivered by the secondary winding reaches its maximum.

Claims (1)

Claim: The use of a known per se, fed by a single-phase network Three-limb transformer, on one limb of which there is a winding, which is connected to adjustable resistors, while the secondary winding of the transformer is distributed to the other two legs (expediently in equal parts) and its primary winding is housed on one of these two other legs, for the supply of single-phase collector rail motors with an adjustable voltage. 1 sheet of drawings