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The formula for magnetomotive force (MMF) across an air gap in a magnetic circuit is given as:
[MMF = H times l]
Where:
– (MMF) is the magnetomotive force, typically measured in Amperes (A),
– (H) is the magnetic field strength in the air gap, measured in Amperes per meter (A/m),
– and (l) is the length of the air gap, measured in meters (m).
The MMF can also be directly related to the number of turns (N) and the current (I) in the coil that’s creating the magnetic field, using the formula:
[MMF = N times I]
This formula provides a straightforward way to calculate the MMF for a given electrical coil and current, particularly relevant in the design and analysis of electrical machines and magnetic circuits.