A 0.5-hp, 120-V, 2-pole, 70% efficient PM motor utilizes samarium-based permanent magnets. Its ideal no-load speed is 1000 rpm, and armature resistance is 1.5 Q. The pole length and the average radius of the motor are 55 mm and 45 mm, respectively. Determine the operating line of the motor if all the losses except the copper loss are negligible. Consider the motor constant to be 80. A 100-V, 2-pole, PM dc motor with Alnico magnets drives a load of 0.25 hpat an efficiency of 72%. When the motor operates at no load, its speed is 1000 rpm. The pole length and the average radius of the magnets are 65 mm and 55 mm, respectively, and the resistance of the armature circuit is 1.2 R. Determine the operating line of the motor. The demagnetization characteristic of the Alnico magnet is given. K, is 65

A 0.5-hp, 120-V, 2-pole, 70% efficient PM motor utilizes samarium-based permanent magnets. Its ideal no-load speed is 1000 rpm, and armature resistance is 1.5 Q. The pole length and the average radius of the motor are 55 mm and 45 mm, respectively. Determine the operating line of the motor if all the losses except the copper loss are negligible. Consider the motor constant to be 80. A 100-V, 2-pole, PM dc motor with Alnico magnets drives a load of 0.25 hpat an efficiency of 72%. When the motor operates at no load, its speed is 1000 rpm. The pole length and the average radius of the magnets are 65 mm and 55 mm, respectively, and the resistance of the armature circuit is 1.2 R. Determine the operating line of the motor. The demagnetization characteristic of the Alnico magnet is given. K, is 65