PERCENT REGULATION 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 À full load speed full load speed.