Motor Homework Solutions Problem 1: Statement: Which type(s)of electric motor would you specify To drive a load with large inertia. b. To minimize variation of speed with load variation. To maintain accurate constant speed regardless of load variations. Solution: See Mathcad file P0216. a Motors with high starting torque are suited to drive large inertia loads.Those with this characteristic series-wound,compound-wound,and shunt-wound DC motors,and capacitor-start AC motors. b. Motors with flat torque-speed curves(in the operating range)will minimize variation of speed with load variation.Those with this characteristic include shunt-wound DC motors,and synchronous and capacitor-start AC motors. Speed-controlled DC motors will maintain accurate constant speed regardless of load variations. Problem 2: Refer to the AC motor performance curve in the following figure. a)What type of motor is the curve likely to represent? b)If the motor is a six-pole type,rated at 0.75 hp,how much torque can it exert at the rated load? c)How much torque can the motor develop to start a load? d What is the breakdown torque for the motor? 100 80 60 40 20 0 0 100 200 300 400 Torque (percentage of full-load torque)Motor Homework Solutions Problem 1: Problem 2: Refer to the AC motor performance curve in the following figure. a) What type of motor is the curve likely to represent? b) If the motor is a six-pole type, rated at 0.75 hp, how much torque can it exert at the rated load? c) How much torque can the motor develop to start a load? d) What is the breakdown torque for the motor?