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A 220 V, 960 rpm, 20 A separately excited DC motor has armature resistance and inductance...

A 220 V, 960 rpm, 20 A separately excited DC motor has armature resistance and inductance of 1.2 ohms and 50 mH respectively. Motor is controlled by a single phase half controlled rectifier with source voltage of 230 V, 50Hz.
(a) Calculate no load speeds and speeds and developed torques on the boundary between continuous and discontinuous conduction for ą = 45°, 90° and 135°.
(b) Calculate and plot speed torque curve for ą = 45°.

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