DE672713C - Arrangement fed with single-phase alternating current, in particular for switching mechanisms or switching machines of alternating current vehicles - Google Patents

Description

Arrangement fed with single-phase alternating current, especially for switching mechanisms or switching machines of AC vehicles for driving the switching mechanism or the control machine in single-phase AC traction vehicles has been used up to now DC motors used almost universally. To the existing alternating current directly To be able to exploit, it has already been proposed to single-phase main-trailing motors use. Vehicles operated from a single-phase network are also already Three-phase induction motors have been used.

To such a three-phase induction motor from a single-phase network To be able to feed from, it would be possible with the help of phase shifting means to apply a more or less pronounced rotating field. Such an arrangement however, it would be useless for the present purpose as it does not allow reversal. The direction of the right-hand rotating field is namely with single-phase alternating current operated induction motors essentially by the direction of rotation of the rotor set, while that generated with the help of phase shifting means, from the outside The rotating field that is pressed on only determines the approach direction, one that is already approximately synchronous running: however, the motor is generally unable to reverse. It is already one with single-phase alternating current fed drive arrangement became known in which between Motor and mains a phase splitter formed from an idling three-phase motor is laid. Since a rotating field is imposed on the motor from the outside, that is The torque can also be determined during the run by swapping two connecting lines in a simple manner a change of direction takes place.

Frequent and rapid reversal of the via the phase splitter to enable powered three-phase induction motor and one of load and To achieve voltage fluctuations approximately independent speed of the same, will the phase splitter according to the invention is provided with a large flywheel. To this Way it is avoided with certainty that large current surges occur when reversing and as a result of the reaction on the phase splitter, the latter changes its direction of rotation.

The phase splitter can be started either by starting or by means of phase shifting means, for example capacitors or ohmic resistors, take place. The use of capacitors has the advantage that you can use them does not need to switch off after booting.

In the figure, an embodiment of the invention is shown. With z the single-phase network is referred to, to which the from a three-phase short-circuit armature motor existing phase splitter 2 is connected. Two of its phase ends are immediate on the single-phase network z, while the third phase end via a capacitor 6 again is connected to one of the network conductors. On the shaft of the rotor 3 is a flywheel 7 applied. With the reference characters q., 5 is that of a three-phase induction motor existing drive motor. The reversal is done by swapping two Phase connections that are made in a simple manner by the changeover switch 8 can.

The invention can also be used with the same advantage, when it comes to running at an almost constant speed, from one To be able to frequently and quickly reverse drive motors fed by a single-phase network. .

Claims (1)

PATENT CLAIM; Arrangement fed with single-phase alternating current, in particular for switchgear or switchgear of AC vehicles, where between the three-phase induction motor used as the drive motor and the mains on an idling three-phase motor formed phase splitter is placed, thereby characterized in that this phase splitter is equipped with a large flywheel is.