A 220V, 3hp, 1800rpm separately excited DC motor is controlled by a one-phase full-wave converter with an AC source of 230V at 60Hz Assume that full load efficiency of the motor is 88% and enough field inductance is added to ensure continuous current for any torque greater than 25% of rated torqueRa=15?
1 Determine the firing angle?to obtain the rated torque at 1200rpm
2 Compute the firing angle for the rated breaking torque at -1800rpm
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3 Find the firing angle corresponding to a torque of 35NÂ·mand speed of 480rpm, assuming continuous conduction