SU1277329A1 - Reversible d.c.electric motor - Google Patents

Abstract

The invention relates to electrical engineering and can be used in machine control systems of rolling mills. The improvement of energy and mass-dimensional parameters is ensured by the fact that the reversible controlled rectifier 4 is made on two switched-on counter-controlled bridges and its output is connected to the core of the electric motor 1. The inputs of the uncontrolled rectifier 6 are connected to the second terminals of the trans-Q secondary windings formator 3. Depending on the value of S (L

Description

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Signs of the EMF of the electric motor 1, the controlled rectifier 4 in the steady-state mode remains working in the rectifying mode or, as a result, the invention relates to electrical engineering and can be used in DC electric drives of metal-cutting machines, rolling mills, hoisting-and-transport machines and other automated objects national households. The aim of the invention is to improve the energy and weight and size characteristics of the electric drive. The drawing shows the circuit diagram of the device. The device contains an electric motor 1 with a serial winding 2 of the excitation, a transformer 3, the primary windings of which are connected to an AC power source, a reversible controlled rectifier 4, whose inputs are connected to the first terminals of the secondary windings of the transformer 3, a choke 5 connected to the circuit core of motor I, and uncontrolled rectifier 6, to the output of which the excitation winding 2 is connected in series. The reversible controlled rectifier 4 is implemented on two switched anti-parallel controlled motors and to its output is connected the core of the electric motor 1, and the inputs of the uncontrolled center of the switches 6 are connected to the second terminals of the secondary windings of the transformer 3. The drawing also shows the sensor 7 and a setting device 8 of the rotational speed of the electric motor 1 connected to the inputs of the speed regulator 9, the output of which and the output of the current sensor 10 of the electric motor 1 are connected to the inputs of the current regulator 11, the output of the latter is connected to the input of the system 12 by it field-phase control of a reversible controlled rectifier 4. The device operates as follows.

Claims (1)

The effect of the current sensor output signal is switched to an inverter mode with current regulation during deceleration. 1 il. In the absence of a mismatch between the actual and a predetermined voltage rate at the output of the controlled voltage of the capacitor 4 is absent. When an error signal is detected, the controlled rectifier 4 goes into the rectifying mode and is the source of the main current and the motor excitation current equal to it. Next, the motor is excited, which is characterized by an increase in the current of the electric motor 1, the controlled rectifier 4, the excitation winding 2 and the simultaneous decrease in voltage due to an increase in the output signal of the current sensor 10 at the output of the controlled rectifier 4 until will reach a steady-state value and will not meet the required motor torque at a steady-state speed corresponding to the set one. Depending on the magnitude of the motor and the EMF sign of the motor, the controlled rectifier in the steady-state mode remains working in the rectifying mode (motor mode of the electric motor) or due to the output signal of the current sensor i switches to the inverter mode (generator braking of the electric motor with energy recovery) with current regulation in the process of braking. The drive can be made in single-phase version. Claims of the invention A reversible DC electric drive comprising a motor with a series of excitation windings, a transformer whose primary windings are connected to an AC power source, a reversible controlled bucket, the inputs of which are connected to the first terminals of 12773294 ladies secondary windings of the transformer, pour, reversible controlled rectifier throttle included in the tangled circuit is made on two included electric motor, and uncontrollable counter-parallel-controlled motor, to the output of which is under-and to its output is connected circuit A coil is connected to a motor winding, and non-excitation inputs, a different controllable rectifier, are connected. By the fact that, in order to improve the energy to the second conclusions of the secondary windings chesky and mass-dimensional display-transformer.