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Section 13.5: Performance Equations cont.

E = Vt - RaIa (KVL) and E = k1nf so that …

n = (Vt - RaIa )/(k1f ) which is the so-called speed equation

If the field isn’t saturated, then f = kfIf so that …

n = (Vt - RaIa )/(kIf) where k = k1kf

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