The following details are known about a 150 hp motor, 240 V, 500rpm, dc shunt motor. Nominal full load current: 500 A Insulationclass: H Weight: 3400 kg
Find
1.The total losses and efficiency at full load.
2.Calculate the approximate shunt filed exciting current if theshunt field causes 20% of the total losses.
3.Calculate the value of the armature resistance knowing that50% of the total losses at full load are due to armatureresistance.
4.With your calculated armature resistance, determine thecounter-emf.
5.Determine the torque of the motor at full load.
6.The supply voltage is decreased to 200 V, approximate thespeed at this supplied voltage.
