The small ultrasonic motor used to move the lens for automatic focusing with a camera (see Section 24.3.3, Mechtronics W

[answerhappygod]

The small
ultrasonic motor used to move the lens for automatic focusing with
a camera (see Section 24.3.3, Mechtronics Wiliam
Bolton) drives the ring with so little inertia
that the transfer function relating angular position with input
signal is represented by
1c s , where c is the constant
of proportionality relating the frictional torque and angular
velocity. If the motor is to be controlled by a closed-loop system
with unity feedback, what type of behaviour can be expected if
proportional control is used?