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The magneto-motive force (MMF) required for the stator teeth in an electric machine (such as an induction motor or generator) can be determined based on the magnetic field strength (H) necessary to induce a certain flux density (B) in the teeth material, considering the teeth’s cross-sectional area and length. However, the MMF formula for stator teeth specifically depends on magnetic circuit principles and is influenced by the design and material properties of the machine.
The general formula to calculate MMF ((F)) for any part of the magnetic circuit, including stator teeth, is given by:
[ F = H times l ]
Where:
– ( F ) = MMF (in Ampere-turns, At)
– ( H ) = Magnetic field strength (in A/m), which can be obtained from the material’s B-H curve for the desired level of magnetic flux density ( B )
– ( l ) = Length of the magnetic path under consideration (in meters), which, for stator teeth, would be the length of the teeth
In practice, determining ( H ) for the stator teeth means consulting the B-H curve (also known as the magnetization curve) for the specific material used in the stator teeth. This curve shows the relationship between the magnetic flux density ( B ) (in Teslas, T) and the magnetic field strength ( H ) (in A/m). Given a desired flux density
Answer: c
Explanation: First the mmf per meter of stator slots is calculated by its equation. Then the length of the flux path in rotor core is obtained and the product of both gives the stator teeth mmf value.