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Designing the proper part-salient, part-consequent winding

  • August 2001
  • Number of views: 3861
  • Article rating: 5.0

Chuck Yung
EASA Technical Support Specialist

Sometimes when redesigning a motor, the desired speed requires more poles than are possible for the number of stator slots. Or, a motor arrives in the service center with a nameplate speed that does not seem to be compatible with the number of stator slots (e.g.,18 poles with 36 slots). In both cases, the answer may be a part-salient, part-consequent winding.

To understand how this winding works, let’s compare it to ‘normal’ winding designs. One winder’s trick for verifying the integrity of a connection diagram is to trace through each phase and “arrow-diagram” the groups. For a salient- pole winding, the polarities alternate with each physical group (Figure 1). With a consequent- pole connection, all the arrows point the same direction (Figure 2).

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