Electric Machine Daily Quiz #5

main field on armature field

armature field on main field

delayed commutation on main field

ideal commutation on main field

leading pole tips in dc machine

trailinging pole tips in dc machine

leading pole tips in dc generator, trailing pole tips in dc motor 

leading pole tips in dc motor, trailing pole tips in dc generator

MNA into direction of rotation for dc motor

GNA into direction of rotation for dc motor

MNA into direction of rotation for dc gen

GNA into direction of rotation for dc gen

Sparking stops due to better commutation

More output power due to less armature reaction

Less output emf in generators and More speed in Motors

A, B

A, C

Qe = Qm /2

Qm = Qe /2

Qe= P x Qm /2

Qm = Px Qe /2

commencing poles

commutating poles

catastrophic poles

none

Same as of upcoming/ succeeding main pole 

Same as of upcoming/ succeeding main pole for motor

Same as of upcoming/ succeeding main pole for generator

Same as of precceeding main pole