Question

For a tachometer, if a(t) is the rotor displacement, e(t) is the output voltage and K is the tachometer constant, then the transfer function is given by:

(a) Ks^2

(b) K/s

(c) Ks

(d) K

The question was posed to me in final exam.

My question is from Differential Equations of Physical Systems and Dynamics of Robotic Mechanisms topic in portion Mathematical Models of Physical Systems of Control Systems

Answer 1

Right choice is (c) Ks

To explain: e(t)=Kw

  E(s)=Ksa(s)

  E(s)/a(s)=Ks.