A Text Book of Electrical Machines

3-phase air gap ampere amplidyne armature circuit armature conductors Armature copper loss armature current armature reaction armature resistance AT/pole Back e.m.f. booster braking Calculate coil side commutator segments compensating winding compound motor connected in series core critical resistance cross-magnetising D.C. machine D.C. motor D.C. shunt motor demagnetising divertor Ebla eddy current efficiency electrical Example external characteristic field circuit field winding full-load Hence hysteresis I₁ increase induced e.m.f. input current interpole line current load current load torque magnetic field magnetisation mechanical motor takes N₁ N₂ no-load Number of poles ohms respectively phase power factor rated Rdiv reactance Regenerative braking rheostat rotation separately excited series field resistance shown in Fig Shunt field current Shunt field resistance Solution speed Stray losses Supply voltage temperature rise terminal voltage thyristor torque transformer V₁ voltage drop Volts W₁ wattmeter Φι φια