If power supply connected with magnetic field winding of DC Machine and rotor of the machine is turned by an external source of mechanical power, then a voltage will be induced in conductor of rotor, this voltage will be rectified in DC output by using machine's commutator, a magnetic field will produce around it which will disturb the original magnetic field from the poles this distortion of flux in DC machine is called Armature Reaction
. It causes two serious problems.
Among their topics are the principle of a direct current generator, armature reaction
, parallel operations of direct current generators, the performance of direct current machines, commutation, applications, and stepper motor.
By analyzing the efficiency plot of a single phase transformer we can estimate losses in transformer due to winding resistance and armature reaction. Graph obtained by direct loading method is shown in Figure 5 below.
This graph is also measure of voltage drop across terminal of transformer due to copper losses in winding and armature reaction.
IPMSM's interior permanent magnets in rotor are a favorite for vehicular applications due to their mechanical integrity and stronger armature reaction. IPMSM cross section can be seen in Fig.
Armature reaction flux phasor ([[psi].sub.a]) is defined below:
Radial and tangential components of the flux density due to PM, rotor DC excitation current and armature reaction current acting together (on-load condition) are given in Figs.
With these results, we can analyze the armature reaction and the DC excitation current effects in the demagnetization risk of the magnets.
Several details of the analytical model will be given when evaluating the armature reaction effect.
The advantage of the proposed lumped equivalent circuit is due to the fact that it takes into consideration the armature reaction effect.
Armature reaction will cause a distortion of the distribution of the magnetic field in the air gap of the PM generator.
The d-axis component of armature reaction by the direction of permanent magnet axis will affect the strength of the primary magnetic field in the air gap (Fig.