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Unformatted text preview: current that opposes ia, known as the back electromotive force (emf) which is proportional to the motor speed. vb(t) = Kb d m(t) . 7 dt Where the constant Kb = Kt in a consistent set of units. In the frequency domain these two fundamental effects are expressed as follows: Tm(s) = Kt Ia(s) . . 8 Vb(s) = Kb s m(s) . . 9 Applying KVL we obtain,...
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- Fall '09
- ........., 2L