Calculate additional series resistance required to reduce

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Reference no: EM13293346

a four pole, series motor runs at 900rev/min when taking 30A from a 230V supply. the total resistance ofthe armature and the series field is 0.8Ω. Calculate the additional series resistance required to reduce the speed to 500rev/min if the torque developed is:
i) constant?
ii) proportional to speed?
iii) proportional to the square of the speed.
(Assume the magnetic circuits is unsaturated.)

Reference no: EM13293346

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