A series motor has a 230 V supply and draws 108 A when running at 551 rpm. The armature resistance is 0.12 Ω and the resistance of the series field winding is 0.04 Ω. For 108 A, consider the flux per pole to be 0.022 Wb and for 46 A, consider it to be 0.017 Wb.
(a) Calculate the emf generated when the current is 108 A.
(b) Knowing that E α n* Φ , calculate the new emf generated and the new speed when the motor operates at 46 A.
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