EMF equation of DC GeneratorE = (ΦNPZ) / (60 * A)
where,
E = e.m.f induced in any parallel path in armature
Φ = flux per pole in weber
N = armature rotation in revolutions per minute (r.p.m)
P = No.of generator poles
Z = total number of armature conductors
A = No.of parallel paths in armature
The emf equation of signal phase transform
The residual flux will help the phenomenon of changing flux. So that emf generation takes place.
emf in volts
It is due to presence of form factor(Kf) in the emf equation of Alternators and transformers. Value of form factor is 1.11.
yes indused emf is also called motional emf. If an open coil is subjected to a variable magnetic field, at the ends of the coil a potential difference is induced which is called induced emf. If a coil is connected to an emf source and switched on, the rising current will produced an variable magnetic field which in turn produces an emf. It is called back emf.
EMF or electromotive force, i.e.Voltage, is generated when the magnets inside the alternator turn within the wire coil of the alternator.
The emf equation of signal phase transform
equation of ac machine
ediot
f=4.44fqm
Three things required to produce electromotive force (EMF) in an alternator are a magnetic field, a conductor, and relative motion between the magnetic field and the conductor.
The equation that best describes the induced emf due to the movement of a rod in a magnetic field is given by Faraday's Law of Electromagnetic Induction, which states that the induced emf () is equal to the rate of change of magnetic flux () through the loop formed by the rod. Mathematically, it can be expressed as -d/dt.
if a generator is overexcited it is producing a large amount of reactive power which requires an increase in the alternator emf. To produce this emf, the rotor currents must increase resulting in extreme ohmic rotor losses.
V=1.11KF.Kd.ZNA/60...........?
The residual flux will help the phenomenon of changing flux. So that emf generation takes place.
E1 = 4.44 f N1Øm (for primary)E2 = 4.44 f N2Øm (for secondary)
emf in volts