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50 cycle air-gap ampere turns amps armature conductors armature reaction armature surface armature winding assumed brushes C.G.S. units coil groups coil sides commutator segments copper loss core section cross section current density D.C. machine demagnetizing Determine diameter direct axis dispersion coefficient eddy current electric loading equation Example field coil field winding flux density flux per pole following data refer full pitch induction motor interpole iron loss lap winding layer magnetic loading magnetizing reactance metre number of coils number of commutator number of conductors number of poles number of slots number of turns open circuit optimum value path phase core type pole per phase pole pitch quadrature axis ratio reactance resistance rotor machine salient pole machines short circuit shown in Fig sine wave slip ring slot pitch space factor specific permeance sq.cm stator core temperature rise torque total number vector diagram voltage volts watts wave winding width