Dcmachine

Electric Machine ,[object Object],[object Object],[object Object],[object Object]

Electric Machine ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Electric Machine ,[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],DC Machines Stator Rotor + V f - I f I f I f N  f 2 S

Electric Machine ,[object Object],[object Object]

[object Object],DC Machines Rotor N  f 2 S Armature Winding x x x x x x x x

Magnetic Flux in DC machines  f /2 rotor stator I f S N V f + - . . . . . . x x x x x x Armature Winding I f  a

[object Object],DC Machines  f

[object Object],Orthogonality of Magnetic Fields in DC Machines B I L F Magnetic field due to field winding Magnetic field due to armature winding 90 o

[object Object],DC Machines l f f T e T e = x f l

[object Object],[object Object],[object Object],DC Machines

Transducer with stator and rotor windings

Equivalent circuit for separately excited DC motors SEPARATELY EXCITED DC MOTORS

Electric Machine ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Electric Machine ,[object Object],[object Object],[object Object]

Equivalent circuit for separately excited DC generators SEPARATELY EXCITED DC GENERATORS

DC Machines Energy stored in inductor is stored in the magnetic field within the coil The mutual inductance between the armature and field windings ,[object Object]

DC Machines ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],using and Steady state relationship between the angular velocity end electromagnetic torque

DC Machines ,[object Object],Where L ff = field self-inductance L aa = armature self-inductance L af = mutual inductance between the field and rotating armature coils

DC Machines - Shunt Connected ,[object Object]

DC Machines - Shunt Connected ,[object Object],Where L ff = field self-inductance L fa = mutual inductance between the field and rotating armature coils e a = induced voltage in the armature coils (also called counter or back emf )

DC Machines - Shunt Connected ,[object Object],mmf field mmf armature + -

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