SU37182A1 - Asynchronous Motor Synchronization Device - Google Patents

Description

The present invention relates to devices for synchronizing an asynchronous motor, the rotor winding of which is switched by a switch from a starting resistor to a direct current source with switching on by means of a special device of the two phases in parallel.

The drawing shows a schematic diagram of the proposed device.

For the parallel connection of two phases of the rotor, two of the three contact rings are used, short-circuited by a device designed to simultaneously lift the contact brushes from these rings. In the third ring, the brushes do not lift and must remain sliding along the ring with a constant fit. In order to maintain a good sliding contact on the ring and to prevent wear of the brush, it is necessary to make copper-graphite.

DC power windings of the rotor will be produced from an unauthorized source, i.e., from specially installed dynamos for both individual and group power supply, as well as from dynamos that run on the same shaft with a synchronous motor, such as -generators working in the tram network.

The process of switching on the supply wires itself is performed as follows. One pole of the feed wire, for example, the negative one, is rigidly connected to the stator housing of the induction motor itself (the zero point of the starting resistor must have good contact with the motor housing). The other, in our case-positive pole, is connected to one of the contacts of a single-pole knife switch of the switch, the other contact of which is connected to the starting resistor in the phase that is intended for the contact ring of the rotor with permanently adjacent brushes. The mean contact from the knife of the switch-switch is connected to the constantly adjacent brushes of the slip ring of the rotor winding, which operates without a closing segment.

During an asynchronous engine start-up, the knife of the switch-switch is in the state of connection with the contact of the starting rheostat, and when receiving normal engine speed, the knife of the switch is switched to the contact of the dynamo pole (positive), where the corresponding DC voltage should be generated.

After this generation, it is possible to transfer the rotor lever to turn the second circuit with two rings with segments (this operation can be performed earlier, as soon as the starting rheostat is brought to the zero position -

there will be no consequences from this). The rotor is supplied with a direct current during synchronous operation of the motor through the following circuit: plus, switch knob, set to position 2, ring a, rotor winding, closing two rotor phases in parallel, slip rings b, c, closed; a device electrically connected through the motor housing to the other pole of the DC source.

The subject matter of the invention.

Asynchronous motor synchronizing device DL, winding: rotor

which, using a switch, reconnects from a starting resistor to a direct current source with the inclusion of two phases in parallel, characterized in that two of three contact rings are used for parallel connection of two phases of the rotor, short-circuited with these devices, simultaneously rings: ii electrically connected through an engine casing to one pole of a DC source, the other pole of which is connected via a switch to the third rotor ring, equipped with by fixed brush.