Minimum distance of air gap
Friction and windage causes mechanical loss in DC machines.
All DC machines are works based on the principle of FARADAY'S LAW OF ELECTROMAGNETIC INDUCTION.
No
05 types of dc machines
machines
The Enterprise!!!!!!!!!!!!
Carbon brushes used in DC machines because carbon is soft material and it does not generate spikes when contact with commutator
a common magnetic flux crosses the air gab from stator to rotor cores causing in the production of north and south poles in the air gab between them
Electro Magnetic Field
because the dc motor will act as dc generator as same as dc generator acts as a dc motor .so it is called as dc machines.AnswerBecause generators and motors are machines, and operate on d.c.'A.C. machines' are generators, transformers, and motors which operate on a.c.
all the electrical machines can be run either as a motor or as a generator. but dc machines, A motor can be run as generator and vice versa with little modification
chata matha .