Ea (V) MAGNETIZATION CURVE 225 220 V series DC motor has an armature resistance of 0.04 Q. The motor always draw 4 A from its source. The armature reaction causes 10% flux lost. Magnetization curve of the iron core is given for 1200 rpm motor speed, and it is linear between 0 and 4 A. (Magnetization curve does not consider the effect of armature reaction.) 200 machine speed is 1000 rpm a. Calculate the induced voltage, adjusted field resistance, rotor copper losses, stator copper losses and induced torque for the given speed of the motor. b. The mechanical load decreases %10 Find the new induced voltage and speed. If 6.0 - Ir (A) 1.0 2.0 3.0 4.0 5.0 Field Current it is possible, how can we restore the previous speed value in a? c. For secure operation of series DC motors, what is the most critical point that engineers consider according to the torque-speed characteristic? Induced voltage