Electrical Geeks

The d.c. generators have following characteristics in general, 1) Magnetization characteristics 2) Load characteristics 1.Magnetization Characteristics        This characteristics is the graph of generated no load voltage E against the field current I f , when speed of, generator is maintained constant. As it is plotted without load with open output terminals it is also called No load characteristics or Open circuit characteristics.        E o V s I f  is magnetization characteristics        Where  E o = No load induced e.m.f.        But for generator,        E = (ΦPNZ) / (60A) . . .     E α   Φ                 with (PNZ) / (60A)  constant . . .     E  α   I f     ...

dc motor     Introduction: A motor is a device which converts an electrical energy into the mechanical energy . The energy conversion process is exactly opposite to that involved in a d.c. generator. In a generator the input mechanical energy is supplied by a prim mover while in a d.c. motor, input electrical energy is supplied by a d.c. supply. The construction of a d.c. machine is same whether it is a motor or a generator. Principle of Operation of a D.C. Motor : The principle of operation of a d.c. motor can be stated in a single statement as 'when a current carrying conductor is placed in a magnetic field' it experiences a mechanical force'. In a practical d.c. motor, field winding produces a required magnetic field while armature conductors play a role of a current carrying conductors and hence armature conductors experience a force. As a conductors are placed in the slots which are in the periphery, the individual force experienced by ...