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.
The electromotive force (EMF) equation of a synchronous reluctance motor can be expressed as ( E = 4.44 \times f \times \Phi \times T ), where ( E ) is the induced EMF, ( f ) is the frequency of the supply voltage, ( \Phi ) is the magnetic flux per pole, and ( T ) is the number of turns per phase winding. In synchronous reluctance motors, the EMF is generated due to the rotor's reluctance variation in the magnetic field, rather than traditional winding-induced EMF, which is typical in other motor types. The motor operates at synchronous speed determined by the supply frequency and number of poles, contributing to its efficiency and performance characteristics.
It is due to presence of form factor(Kf) in the emf equation of Alternators and transformers. Value of form factor is 1.11.
emf in volts
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
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.
f=4.44fqm
To rearrange the electromotive force (emf) equation into a form suitable for plotting a straight graph, you typically isolate the dependent variable on one side. For example, if the equation is of the form ( E = IR + r ) (where ( E ) is emf, ( I ) is current, ( R ) is resistance, and ( r ) is internal resistance), you can rearrange it to ( I = \frac{E - r}{R} ). By plotting current ( I ) on the y-axis and the emf ( E ) on the x-axis, the slope of the resulting line will relate to the internal resistance and the resistance of the circuit.
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)