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How should the air gap and the fringing effects be if the field form of a salient pole machine is rectangular?

How should the air gap and the fringing effects be if the field form of a salient pole machine is rectangular? Correct Answer air gap under the pole arc is constant, fringing effects are not considered

The field form of a salient pole machine is rectangular if the air gap under the pole arc is not constant. The field form of a salient pole machine is rectangular if the fringing effects are not considered.

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