Find the initial and final values of the armature current

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Reference no: EM131115023

A 7.5-hp, 250-V, 1800-r/min shunt motor, having a full-load line current of 26 A, is started with a four-point starter. The resistance of the armature circuit, including the inter pole winding, is 0.48 Ω; and the resistance of the shunt-field circuit, including the field rheostat, is 350 Ω. The resistances of the steps in the starting resistor are 2.24, 1.47, 0.95, 0.62, 0.40, and 0.26 Ω, in the order in which they are successively cut out. When the armature current is dropped to its rated value, the starting box is switched to the next point, thus eliminating a step in the starting resistance. Neglecting field-current changes, armature reaction, and armature inductance, find the initial and final values of the armature current and speed corresponding to each step.

Reference no: EM131115023

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