A 4-pole 250-V, d.c. series motor has a wave-wound armature with 496 conductors. Calculate (a) the gross torque (b) the speed (b) the output torque and (d) the efficiency, if the motor current is 50 A...

A 4-pole 250-V, d.c. series motor has a wave-wound armature with 496 conductors. Calculate

(a) the gross torque (b) the speed

(b) the output torque and (d) the efficiency, if the motor current is 50 A

The value of flux per pole under these conditions is 22 mWb and the corresponding iron,

friction and windage losses total 810 W. Armature resistance = 0.19 Ω, field resistance = 0.14 Ω.

Aug 31, 2022

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