220 V, 1200 rpm, 16 A separately excited motor is controlled by a l-phase fully controlled rectifier with an AC source voltage of 230 V, 50 Hz. Enough filter inductance  is added to ensure continuous conduction for any torque greater than 50 percent of rated  torque, Ra. = 4 Ω and have La= 30 mH. Calculate motor torques for the firing angle  α=120° and speed =-800 rpm

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