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Transcript
1. DC shunt motor:
 For dc shunt motor, the flux ø is constant.
∴ N ∝ (V - Ia Ra)
…..(10)
2. DC series motor:
 For dc series motor Ifield = Ia. Therefore
N ∝ (V - Ia Ra - Is Rs) / Ia …….(11)
where Eb = V - Ia Ra - Is Rs