Inverter action on reversing of thyratron motor control

A GREAT many of the mechanized operations carried on in the industrial field call for a reversal of the mechanism by its motive power which is commonly an electric motor. In nearly all cases this reversal must not impose a severe strain on the mechanism nor demand an excessive overload from the power lines. In many of these reversing drives, particularly where they are of a cyclic nature, the reversal time is lost time and must be kept to a minimum consistent with the rating of the motor. Many of these drives call for the flexibility of the d-c motor. The d-c motors are supplied commonly from either a d-c shop bus or a motor generator set. However, an increasing number of d-c-motor applications are using the thyratron-tube rectifier to give a wide range of control, including a fast and smooth reversal.