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Question: a 220v 1500 rpm de motor has fullload armature current...

Question details

A 220V, 1500 rpm de motor has full-load armature current of 30 A. It is proposed to design a starter which restricts the maximum armature current during starting to 60 A. For design purposes, the minimum current during starting is to be restricted to 30 A, the series resistance in the armature circuit being cut in steps whenever the current falls to 30 A. Assuming that the armature resistance of the dc motor is 0.5Ω calculate the maximum series resistance used in the starter and the amount of resistance cut during each of the first two steps.

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