ABSTRACT
There are a number of ways to define performance, such as servo bandwidth, accuracy, regulation, etc. Percent regulation, for machine servo drives, can be defined as how much the controlled variable of a servo will reduce as load is applied to the servo. As such, percent regulation is usually applied to type 0 velocity regulators to describe how well the output velocity will be maintained as load is applied to the output of the drive. Percent regulation is often given as the equation
Percent regulation ¼ no load speed full load speed full load speed
A general block diagram for a DC servo drive with a position loop is shown in Figure 1. Using block diagram algebra the servo drive block diagram can be redrawn for speed as the controlled variable with the load torque as an input, shown in Figure 2.
