Question: A motor control system for a computer disk drive must reduce the effect of disturbances and parameter variations, as well as reduce the steady-state error.

A motor control system for a computer disk drive must reduce the effect of disturbances and parameter variations, as well as reduce the steady-state error. We want to have no steady-state error for the head-positioning control system.

(a) What type number is required? (How many integrations?)

(b) If the input is a ramp signal, and we want to achieve a zero steady-state error, what type number is required?

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