SU36513A1 - Device for starting electric motors - Google Patents

Description

It is known to use one rheostat for starting several engines. In this case, the engines do not start simultaneously.

In the inventive device according to the invention, the engine switches are connected in parallel to the starting resistor, each with an additional switch or contacts, by means of which the motor is connected to the resistor only during the start-up period.

On the accompanying drawing shows a diagram of the device according to the invention. . The M-1, ... / I-5 engines, which are powered from the common network 1, are connected to a common starting resistor 9, divided into sections 1-6, with the help of switches with contacts 1-VII. The connection takes place using the contact handle 7 with contact 8, which slides along the I-Vil contacts when the handle 7 is moved.

On the handle 7, the sector 6 is reinforced with an insulating material, with which, when the handle 7 is moved, contacts 12 and 13 are closed, of which contact 13 is connected through contacts 14 and 15 to the engine engine.

The excitation coils 5 of the engine are one imomtsom.m attached to the line through

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knife switch a, with the other end connected to the line through the axis 3 of the handle 7 and through the other knife of the same switch.

When the switch is turned on, the current, the passage through the excitation coils 5, magnetizes them, however, the motor will not rotate, because the core circuit is interrupted in contacts 12-13.

When the handle 7 is installed on pin 1, sector 6 closes contacts 12-13 so that the motor core circuit is closed to resistance 9. At the same time, part of the current will pass through the excitation coils 5, the other part will pass from the line through contact 2, axis 3 to pin 8-i. through resistance 9, contacts 10-11, closed by sector 3, contacts 12-13, through the measles of the engine into the line.

The engine will begin to rotate. As the handle moves toward pin VII, resistance 9 will be removed from the engine circuit; at the same time, sector 6, having passed the proper angle, will release the contacts 12-13, which are open.

Thus, the pus rheostat 3 will turn off from the heat, ;; viatel. However, the power is supplied to the crust of the nuts, since it will be carried out through the starting handle 7, pin 8

which will now be connected with contact 14.I

The start of another engine is carried out with - as described; the starting resistor is the same resistance 9. The engine is stopped by turning the handle 7 in the opposite direction. In so doing, the rheostat 9 is inserted into the engine circuit.

The subject matter of the invention.

. A device for starting electric motors, in which a sectioned starting rheostat is used, characterized in that, in order to use the same rheostat for non-simultaneous & start of a number of engines, the starting switch of each individual engine connected to the resistor in parallel with the other switches motors, equipped with a driven part of an additional switch (or including contacts) 12, 13, located: -1 m in the chain of the corresponding engine and serves to connect the engine to to starting resistance only for the time of movement of part 7 on starting contacts.

2. With the device according to claim 1, use in the starting resistor the backup resistance sections to replace damaged sections.

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