Introduction to Testing of Armature
Later than an armature is wound and the leads are connected to the commutator, a test have to be carry out. By this test, defects might be revealed that might have take place during winding. The general defects in armature windings are grounding, open in the coil, shorts in the coils, and reversal in the coil connection. These types of defects can be located by dissimilar test procedures.
Armature winding resistance test:
The armature coils' resistance measured through using a low range ohmmeter and preferably along with the Kelvin Bridge. Resistance among the consecutive segments in the case of simplex winding (for wave and multiplex windings at a distance of commutator itch Yc) is computed.
The below diagram depicts a simple arrangement to compute the resistance among the successive commutator segments. As displayed in this diagram, a cotton tape along with a counterweight is passed around the commutator to hold the connecting leads to the segments.
Measurement of resistance is completed in all the coils through changing the position of the connecting leads to successive commutator segments. The resistance measured should be similar in every coil. Lower resistance depicts short in turns, when a higher resistance depicts higher numbers of turn or open in the coil.
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