A 150-kW, 600-V, 600 r/min dc series-wound railway motor has a combined field and armature resistance (including
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A 150-kW, 600-V, 600 r/min dc series-wound railway motor has a combined field and armature resistance (including brushes) of 0.125?. The full-load current at rated voltage and speed is 250 A. The magnetization curve at 400r/min is as follows. Determine the internal starting torque when the starting current is limited to 460 A. Assume the armature reaction to be equivalent to a demagnetizing mmf which varies as the square of the current.
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First find the demagnetizing mmf At rated load Ea V IaRtot 600250 x 0125 ...View the full answer
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