SU116793A1 - The method of starting an asynchronous short-circuited electric motor and device for implementing this method - Google Patents

Description

With the known methods of starting an asynchronous short-circuited electric motor, it consumes considerable power, powered by a generator of limited power, the voltage across the terminals of the generator fluctuates sharply, and in a number of cases the self-skipping of the electric motor occurs.

The proposed method is more perfect, since it allows to eliminate the indicated disadvantages.

This is achieved by the fact that, in series with the stator winding of the electric motor, static capacitors are switched on, whose capacity decreases as the motor accelerates according to a certain law.

To implement this method, a device is proposed comprising a centrifugal regulator connected to an electric motor shaft and controlling a switch of a battery of static capacitors.

FIG. 1, 2, 3, 4 schematic diagrams of a device for starting an asynchronous electric motor according to the proposed method.

Consistently with the stator winding of the motor / included static capacitors 2, the capacity of which decreases as acceleration ..,

Switching the individual sections of a battery of capacitors; there is a matter with a switch 3, which can be controlled by a centrifugal regulator 4 (Fig. D) connected to the motor shaft.

When the engine is accelerated, the loosely mounted bushing of the regulator 4 moves along its axis. therefore, the driver 5 under the action of the spring 6 turns the contact plates of the switch 3 clockwise. As a result, as the engine accelerates, the capacitance of the static capacitors 2 decreases. By appropriate selection of these capacitances, it is possible to ensure the maintenance of a constant voltage at the terminals of the generator 7 and the absence of self-skipping of the engine.

Instead of cent | k) begnigo regulator mountains; a tachogenerator can be applied (V (Fig. 2). In an atom, when the engine is driven, the voltage on the tachogenerator benches (increases, which leads to an increase in the force of the electromagnet .9 1 When the engine is fitted, the spring / O returns the switch to the original position.

A current transformer /// included in one of the phases of the motor / and the power switch 12 (Fig. 3) can be used as a measuring unit for controlling the switch L. When used for this purpose, Hohenerg1to1) and instead of a solenoid switch you can use a relay-collision equipment (rel / switchgear. -Y), with which you can close the capacitors 2 in separate phases of the engine (Fig. 4).

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Claims (5)

1. A method of starting an asynchronous (short-circuited electric motor when it is powered from a limited power generator, characterized in that, in order to stabilize the voltage on the geyator terminal, to eliminate the self-wrench electrode and to limit the power it consumes, the static capacitors, the capacity of which as the motor accelerates is reduced according to a certain law. 2. A device for carrying out the method according to claim 1, comprising a centrifugal regulator coupled to the motor shaft and controlling a switch of a battery of static capacitors. 3. A device change according to claim I. And, characterized in that instead of a centrifugal regulator, a tachogenerator is applied, the voltage of which is applied to the coil of the solenoid switch of the battery of static capacitors. 4. The device change according to claim 2, distinguished by the fact that E1, a centrifugal regulator, has a current transformer included in one of the phases of the electric beater and connected to the coil of the solenoid switch by its secondary winding. 5.Video change of the device according to claim 3, so that in order to change the capacitance of the capacitors connected to the electric motor, instead of the solenoid switch, the relay-contactor equipment is used .. Priority on PP. ) -3 items of the invention - March 11, 1957, according to paragraphs 4 and 5 -31 of August 1957. at g Oh oh / “O 3 e