Automatic shifter for generator carbon brush assembly

Abstract

The invention discloses an automatic shifter for a generator carbon brush assembly, comprising a collector ring, carbon brushes and a conductive ring; the collector ring is electrically connected with the conductive ring through the carbon brushes, and the carbon brushes and the conductive ring are supported on the support shell; the automatic shifter is characterized in that a guide rail is arranged on the support shell, and brush handles is slidably disposed in the guide rail; one end of every brush handle is connected with a servo motor, and the other end of every brush handle is connected with the corresponding carbon brush; when rotating, the servo motor drives the brush handles to reciprocate, the brush handles drive the carbon brushes to come into no contact by leaving the collector ring or to come into connection by approaching the collector ring. Under control of a PLC (programmable logic controller), according to measured current of the brushes or measured temperatures of the carbon brushes, the quantity of the brushes in contact with the collector ring is automatically adjusted, and the carbon brush assembly is shifted side to side to contact or leave the collector ring so as to adjust the temperatures of the brushes; superheating of the carbon brushes can be effectively prevented, and safety hazards can be effectively eliminated; current density of the brushes can also be automatically adjusted, and a unit is imparted better safety and operational stability.

Description

technical field [0001] The invention belongs to the technical field of generators, and in particular relates to an automatic moving device for a generator carbon brush assembly that adjusts the distance between a conductive ring and a generator carbon brush, and then adjusts the friction force between the two to control the temperature of the carbon brush . Background technique [0002] During the operation of the generator set, due to the high-speed movement between the collector ring and the carbon brush assembly, the collector ring is in contact with the carbon brush in the carbon brush assembly, and friction will inevitably occur between the two, which will inevitably lead to The carbon brush is worn and the temperature of the carbon brush rises. When the brush holder of the engine unit is designed, the number of brush holders and carbon brushes is usually fixed. During the operation of the unit, the excitation current is not fixed. For example, the design value of the...

AI Technical Summary

Problems solved by technology

If the temperature of the brush is too high, it is usually due to the excessive current density passing through the carbon brush, resulting in heat generation; if the temperature of the carbon brush exceeds 95°C for a long time, the oxide film may be burned out, thereby deteriorating the contact between the brush and the collector ring characteristics, increase the coefficient of friction, increase the generation of frictional heat, significantly increase the wear of brushes and collector rings, and will inevitably reduce the service life of brushes and collector rings

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