A dc, separately excited motor is driving an elevator. At a load torque of 300 Nm, the motor speed is 100 rpm. The motor terminal voltage is 210 V, and the field constant K? is 3 Vs.
a. If the terminal voltage is reversed and reduced to 90 V, calculate the steady-
state speed of the motor.
b. Calculate the terminal voltage required to block (stop) the rotor.
c. Sketch the speed torque characteristics and show all operating conditions
c. For (a), refer to Figure 9.29. For (b), but assume that the characteristics are linear.
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