| Back Emf |
Website Links For Force |
Information AboutBack Emf |
| CATEGORIES ABOUT COUNTER-ELECTROMOTIVE FORCE | |
| electromagnetism | |
|
In a generator using a rotating armature and, in the presence of a Magnetic Flux , the conductors cut the magnetic field lines as they rotate. The changing field strength produces a voltage in the coil; the motor is acting like a generator.. ( Faraday's Law Of Induction .) This voltage opposes the original applied voltage; therefore, it is called "''counter-electromotive force''". (by Lenz's Law .) With a lower overall voltage across the armature, the current flowing into the motor coils is reduced. "Nuclear Power Fundamentals Training Manuals". DC Generators, Counter-Electromotive Force (CEMF), DC Equipment Terminology, Electrical Science Volume 2. If it is assumed that a motor is 100% efficient with no friction or Windage losses, the speed of the armature will increase until the back electromotive force is equal to the applied electromotive force, i.e. there will be no net electromotive force, no current flow and hence, no net force. The armature will spin at a constant rate, of its own accord. REFERENCES |
|
|