Losses mean energy losses, which cost money, and most people like to know how much a machine is going to cost to run.
The slip rings are the most important brush in DC machine.
Constant losses Those losses in a d.c. generator which remain constant at all loads are known as constant losses. The constant losses in a d.c. generator are: (a) iron losses (b) mechanical losses (c) shunt field losses
swinburne's test on dc shunt machine is to predetermine the efficiency of the dc machine , but it is not accurate it is just like estimation of efficiency of dc shunt machine when it is run as a motor and a generator............................
Laminations minimize eddy currents, or current flow across the iron parts. This is one method to minimze stray losses.
05 types of dc machines
The slip rings are the most important brush in DC machine.
The condition for maximum efficiency of a d.c. machine is that VARIABLE LOSSES must be equal to CONSTANT LOSSES i.e., variable losses = constant losses..
How to calculate iron losses in dc machine
in a dc machine core losses occur both in stator and rortor but stator core losses are negligible as compared to rotor core losses because in stator constant dc flux is given and the statot conductor is stationary so there are no eddy losses and as the flux is stationary there are no hysteresis loassses also but in rotor armature winding is placed so here alternating field is induced which cuts the rortating conductors of rotor thereby inducing eddy as well as hysteresis losses fo any more info. contact zombie
Constant losses Those losses in a d.c. generator which remain constant at all loads are known as constant losses. The constant losses in a d.c. generator are: (a) iron losses (b) mechanical losses (c) shunt field losses
What motor is NOT suitable for use as a DC machine?
swinburne's test on dc shunt machine is to predetermine the efficiency of the dc machine , but it is not accurate it is just like estimation of efficiency of dc shunt machine when it is run as a motor and a generator............................
it is a machine which operates on the dc power source.
Laminations minimize eddy currents, or current flow across the iron parts. This is one method to minimze stray losses.
05 types of dc machines
equation of ac machine
A DC generator is a DC machine that is driven by an external rotating force. It is constructed the same as a DC motor.