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A rotary machine has the following parameters: ???=0.03? ??? =0.12? ??? =0.06????? ?? =2.5Ω ?? =3Ω The coils are connected in parallel and the rotor is in the ? = 90° position At time t = 0, the windings are connected to a 30Vdc voltage source and the
The switch in the circuit of Fig. P 7.55 has been in position a for a long time. At t- 0 the switch is moved to position b. Calculate (a) the initial voltage on the capacitor; (b) the final voltage on the capacitor; (c) the time constant (in microseconds) for t > 0; and (d) the length of time (in microseconds) required for the capacitor voltage to reach zero after the switch is moved to position b.