In order to be able to better predict the system response, an alternative topology is needed. One
example of an easier to tune topology is the P.I .V. controller shown in Fig.3. This controller basically
combines a position loop with a velocity loop. More specifically, the result of the position error multiplied
by Kp becomes a velocity correction command. The integral term, Ki now operates directly on the
velocity error instead of the position error as in the P.I .D. case and finally, the Kd term in the P.I .D.
position loop is replaced by a Kv term in the P.I .V. velocity loop. Note however, they have the same
units, Nm/ (rad/sec). Figure 3. Basic P.I .V. Servo Control Topology.