A dc series motor is driving a fan-type load. The armature and field resistances of the motor are 2 ? and 3 ?, respectively. When the terminal voltage of the motor is 200 V, the motor speed is 250 rpm and the armature current is 10 A. Assume that the motor operates at the linear region of the field-current characteristic. Calculate the terminal voltage needed to reduce the motor speed to 100 rpm. Also sketch the speed-torque characteristics and show all operating conditions.
What will be an ideal response?
b. For torque-speed characteristics of this motor, plot the
parameters of this problem.
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