If the stator winding of a synchronized machine, which consists of many coils that are basically connected as a series
circuit, is not connected to a load then the resulting emf from all the coils is the open circuit emf of
the phase winding. Closing the circuit on to a load causes a steady state current to flow in the stator
coils. Each coil creates a flux and their total flux opposes the field flux from the rotor. The resulting
flux in the air gap is reduced. The emf corresponding to the air-gap flux drives the stator current
through the leakage reactance and conductor resistance of the stator coils. The voltage dropped across
this winding impedance is small in relation to the air-gap voltage. Deducting this voltage drop from
the air-gap voltage gives the terminal voltage of the loaded generator. In the circumstance described
thus far the reduction in air-gap flux is called armature reaction and the resulting flux is much smaller
than its value when the stator is open circuit. Restoring air gap and terminal voltage requires the
field current to be increased, which is the necessary function of the automatic voltage regulator and
the exciter.
When the rotor pole axis coincides with the axis of the stator coils the magnetic circuit
seen by the stator has minimum reluctance. The reactance corresponding to the armature reaction
in this rotor position is called the 'direct axis synchronous reactance Xsd '. If the stator winding
leakage reactance, Xa, is deducted from Xsd the resulting reactance is called the 'direct axis
reactance Xd '.
A similar situation occurs when the rotor pole axis is at right angles to the axis of the stator
coils. Here the magnetic reluctance is at its maximum value due to the widest part of the air gap facing
the stator coils. The complete reactance in this position is called the 'quadrature axis synchronous
reactance Xsq '. Deducting Xa results in the 'quadrature axis reactance Xq '.
An impedance triangle has resistance (always positive) in the x axis and reactance (at a right angle to resistance) in the y axis. The line that completes this triangle (the hypotenuse) is the absolute value of the impedance.
d-q a direct (magnet pole) and quadrature (90deg out of phase electrically) axis. This is identical to surface permanent magnet machine (SPM).
The reciprocal of reactance is susceptance, expressed in siemens.
for inductor, reactance XL = 2*pi* f *L, if frequency doubles then reactance increase. But for capacitor, reactance Xc = 1/(2*pi*f*C). In this case if frequency doubles the reactance decrease.
The unit of measurement for inductive reactance (XL) is the ohm.
Kamal Koshal has written: 'Direct and quadrature-axis synchronous reactance measurement'
Quadrature axis of a magnetomotive force is defined as that component of MMF that is directed along an axis in quadrature with the axis of the field poles. Quadrature axis of a magnetomotive force is defined as that component of MMF that is directed along an axis in quadrature with the axis of the field poles.
An impedance triangle has resistance (always positive) in the x axis and reactance (at a right angle to resistance) in the y axis. The line that completes this triangle (the hypotenuse) is the absolute value of the impedance.
It has several meanings, none of which have anything to do with computer programming. In mathematics, a Quadrature is a numerical integration.
d-q a direct (magnet pole) and quadrature (90deg out of phase electrically) axis. This is identical to surface permanent magnet machine (SPM).
Inductive reactance, as well as capacitive reactance, is measured in ohms.
Inductive reactance.
Quadrature phase occurs when two periodic waveforms have a phase difference of 1/4 of their output period.
you can finde integral with 4 gauss quadrature in book for meshfree writed by G.R.Liu after one chaper there is a program .in that is program that use gauss-quadrature for integral with fortran. excuse me for my bad writing.
The reciprocal of reactance is susceptance, expressed in siemens.
The symbol for inductive reactance is XL.
A. H. Stroud has written: 'Gaussian quadrature formulas' -- subject(s): Gaussian quadrature formulas, Mathematics, Tables