SU1527698A1 - Multimotor electric drive - Google Patents

Abstract

The invention relates to electrical engineering and can be used for electric drives of general industrial mechanisms. The aim of the invention is to increase reliability. The device contains two asynchronous electric motors 1, 2, three diodes 3 - 5, a contactor with three closing contacts 6 - 8. In the initial starting position of the beginning of the phases of the stator windings of electric motors 1 and 2 are connected to the mains and current is not flowing around, since their ends are not connected between themselves. When the contacts 6 - 8 are turned on, the ends of the phases of the stator windings of the electric motors 1, 2 are closed through diodes 3 - 5 and contacts 6 - 8, as a result, the windings flow around the alternating current and the electric motors are started. The switch to the braking mode of the electric motors is carried out by opening the contacts 6-8 of the contactor. In this case, three short-circuited circuits are formed, each of which consists of windings of one phase of electric motors 1, 2 and one of diodes 3 - 5. Due to the effect of EMF of electromagnetic induction a current of one direction flows through the three circuits, as a result, the electric drive brakes. 1 il.

Description

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This invention relates to electrical engineering and can be used in electric drives of general mechanical mechanisms.

The purpose of the invention is simplification.

The drawing shows a diagram of the drive.

Multi-motor electric drive, contains two three-phase asynchronous electric motors and 2, three diodes 3-5, a contactor with three closure terminals} 1 pins 6-8, one phase terminals of the stator windings of electric motors 1 and 2 are connected to common points with clamps 9-1 for connection to the phases of the power source, the other terminals of the phases of the static winding of the first electric motor 1 are connected respectively to the anodes of diodes 3-5, the cathodes of which are connected to the other phases of the stator winding of the second electric motor 2, between the cathodes of the first diode and 3 and the anode of the third diode 5 is connected to the first contact- ing contact 6. of the contactor, the contact 7 of the contactor is connected between the cathode of the second diode 4 and the anode of the first diode 3, and third is connected to the third diode of the third diode 4 closing contact 8 of the contactor.

The drive works as follows.

In the initial pre-start position, the beginning of the windings of the electric motors 1 and 2 are connected to the mains and are not flowing around the current, since their ends are not interconnected.

When the contacts 6-8 of the contactor are turned on, the ends of the windings of the electric motors 1 and 2 are closed through diodes 3-5 and the contacts 6-8 of the contactor, as a result of the windings of the motors they flow around the AC current and they start.

Current, for example, in the third and second phases of the first electric motor 1 flows through the circuit: phase C, third phase of the stator winding of the electric motor 1, diode 5, contact 8 of the contactor, second phase of the stator winding electr motor h 1, phase B, second phase of the stator motor winding 1, diode 4, contact 7, diode 3, contact 6, the third phase of the stator winding of the electric motor 1, phase C.

Switching motors into braking mode, the contacts 6-8 of the contactor open.

Three short-circuited circuits are formed: the third phase of the staton winding of the first electric motor 1, diode 5, the third phase of the stator winding of the second electric motor 2, a similar circuit with diode 4 takes place in the second phases and diode 3 in the first phases of the electric motors. The current of one direction flows through these three short-circuited circuits due to the presence of diodes 3-5 due to the action of EMF of electromagnetic induction, as a result of which the electromagnetic braking of electric motors is carried out.

Thus, the use of a contactor in the invention to connect the ends of the stator windings of electric motors to each other and to create short-circuited circuits significantly simplifies the design of the electric drive, increasing its reliability and efficiency.

Claims (1)

Invention Formula Multi-motor electric drive containing two three-phase asynchronous electric motors, three diodes, a contactor with three closing contacts, one terminals of the stator windings are phase-wise connected to common points, other terminals of the first and second phases of the stator winding of the first electric motor are connected to the anodes of the first and second diodes, respectively, another output of the first phase of the stator winding of the second motor is connected to another output of the third phase of the stator winding of the first motor through the first contact contact contact torus, about t - lichaschkay.s with the fact that, in order to simplify, the other conclusions of the third phases of the stator windings of the first and second electric motors are connected respectively to the anode and cathode of the third diode, the cathodes of the first and second diodes are connected to other conclusions of the first and second phases of the stator winding the second motor, respectively, the anode of the first diode through the second closing contact of the contactor is connected to the cathode of the second diode, the anode of which 51527698 through the third contacting and second motor, the contact controller is connected to the cathode by means of clamps to connect to the diode diode, common points of the power supply source of the directly connected stator windings first.