A new method for compensating contactor servomechanisms

WHEN a servomechanism contains an on-off relay or contactor as a controlling device, it is called a contactor servomechanism. Among the great advantages of this type of servomechanism are its simplicity and low cost.1 One of the great disadvantages, however, is that it falls in the category of nonlinear systems. Unfortunately, the state of the art at present is such that these systems do not lend themselves to analysis as readily as do conventional linear ones. Fig. 1 shows a diagram of a typical contactor servomechanism. Fig. 2 shows the block diagram of this same system.