Chuck Yung
EASA Technical Support Specialist

When an armature is rewound, there is always a slim chance that it may be connected incorrectly. If two coil leads are switched, or if the error results in an armature where each coil closes on itself, normal tests will detect the problem. The trouble arises when the misconnection results in a uniform winding. When that happens, the result may be—in effect—an accidental redesign for a different voltage.

The number of parallel circuits in an armature winding can be changed simply by shifting the top lead position. As with a 3-phase winding, doubling the circuits halves the design voltage. If a wave-wound armature is rewound with the same data but connected lap simplex, or if a lap simplex armature is connected lap duplex, the circuits have been doubled. The same is true of a wave simplex armature reconnected wave duplex.

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