Chuck Yung
EASA Senior Technical Support Specialist

Air gap is the physical gap between a rotor and stator core in an AC machine, or between the armature and fields / interpoles in a DC machine. The role of the air gap is not as simple as it appears.

Topics discussed in this article include:

• Important principles (magnetic force and the amount of current to drive flux through air)
• Air gap in AC machines
• Air gap in DC machines

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