Load balancing control system coaxially operating with dual-direct-current (DC) separately excited machine and control method thereof

Abstract

The invention provides a load balancing control system coaxially operating with a dual-direct-current (DC) separately excited machine and a control method thereof. The control system comprises a DC speed regulating device, excitation control units and a Hall current sensor; the control system detects the difference value between the armature current of a first motor and the armature current of a second motor by the Hall current sensor when the two motors are operated, and outputs a regulating signal corresponding to the difference value; the regulating signal is overlaid to a given mouth of the excitation control unit of the second motor so as to regulate the exciting current of the second motor, thus realizing automatic equalization of output power of the first and second motors; and if the armature current of the first motor is more than the armature current of the second motor, the regulating signal is a positive value, thus the exciting current of the second motor is increased; and conversely, the regulating signal is a negative value, thus the exciting current of the second motor is decreased.

Description

technical field [0001] The invention belongs to the technical field of motion control and computer automatic control of large equipment. Background technique [0002] Due to the limitation of DC motor capacity, manufacturing technology, volume, installation method and cost, some large-scale equipment often adopts the method of dual-motor or multi-motor coaxial drive, and the control mode of dual-machine coaxial drive is divided into "one-to-one" and " One-to-two" drive mode. [0003] The "one-to-one" drive control method is two DC separate excitation motors coaxial (rigid connection), equipped with two sets of DC speed regulating devices to control the two motors respectively, and two excitation control units to control their excitation currents respectively. The "master-slave" current control method is adopted between the two sets of DC speed regulating devices to automatically balance the loads of the two motors. Its disadvantage is that a set of DC speed regulating devi...

AI Technical Summary

Problems solved by technology

The parallel connection of the armature windings can adjust the speed of the motor from zero speed to the rated speed. However, due to the differences in the line impedance and the inherent characteristic parameters of the motor armature circuit, the armature currents of the two motors are different, which affects the two motors. The output of the motor, in severe cases, may apply the load of the equipment to a motor, causing the brushes or commutator of the DC motor to ignite, and damage the motor or the DC speed control device

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