SU64193A1 - Control device for multi motor driven - Google Patents

Description

For Controls of a multi-motor drive are known devices having a common starting device, connected between the current source and the starting tires. During the period of start-up, the individual electric motors are connected to the specified starting tires by the contactors, and upon the completion of the start-up they are automatically switched to the working tires. Also known are devices for feeding several DC motors to a common controlled mercury rectifier.

In this invention, the use of a multi-motor drive of the type indicated above as a general trigger for a controlled mercury rectifier is new.

The starter mercury rectifier replaces the Leonard generator in the device, in comparison with which it possesses a number of relays.

The proposed device is shown schematically in the drawing.

The motor is started by means of a separate starting mercury rectifier PV with control grids receiving n; it is supplied from the transformer T, which also supplies the main mercury rectifier GW. Its primary

winding transformer T measure disconnector P "VM oil switch is connected to the network of 3-6 square meters.

Before starting operation, the rectifier PV must be energized, for alternating current is applied to its anodes.

To start the corresponding motor D1 (Till), a 4K contactor is turned on, which connects the motor to the start-up buses PN and PRS. Following this, the contactors 1K, 2K are turned on and the PV rectifier is connected to the starting buses. The rectified voltage supplying these buses starts to automatically change from zero upwards. This is accomplished by shifting the grid voltage (from 90 °) with a phase regulator slowly driven by a servomotor (not shown in the diagram).

The voltage of the start-up rectifier PV increases to a value slightly higher than the voltage of the main rectifier HV.

In this case, the motor D) or D2 accelerates to a speed corresponding to this voltage. . At the moment when the voltage of the rectifier PV reaches the specified value., Dggtatel D (D: :) machine 1)

Switches with a 5K contactor to the RSH bus receiving voltage from the main GW rectifier. After the start of this engine, the servomotor begins to rotate in the opposite direction, driving the phase regulator to the initial position.

To ensure a smooth start of the engines — small power, they are shunted by ballast resistance B, which is switched on in a parallel way by means of an AC contactor. In this way, it is possible to start the motors not in the area of intermittent currents, where, as is well known, the mechanical characteristics n ±: f (M) acquire a serial character.

Engines at auxiliary (low) speed are provided by automatically setting the phase regulator to the appropriate position,

Depending on the mass driven by the engine, the speed of the start is determined by the latter, which is achieved by appropriately adjusting the speed of the servomotor, which causes the phase regulator to rotate in the circuit

mesh. start rectifier PV.

Subject invention

Claims (3)

1. A device for controlling a multi-motor drive using a common starting device connected between the current source and the starting tires, to which the individual 3 eKTipo motors are connected by means of contactors during the start-up period, after which the motors automatically switch to working areas, It is also true that a control mercury rectifier was used as a trigger device. 2. In the device according to claim 1, use a controlled mercury rectifier to power the working women. 3. In the device according to claim 1, the application is for controlling a luggled mercury rectifier - a phase regulator that is automatically returned via the servomotor to its initial starting position after the end of the start of the next electric motor. fS