b) Two-quadrant DC motor drive uses a separately excited dc motor that has a torque constant of 1.2 Nm/A, an armature in

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B Two Quadrant Dc Motor Drive Uses A Separately Excited Dc Motor That Has A Torque Constant Of 1 2 Nm A An Armature In 1 (1.26 MiB) Viewed 20 times

b) Two-quadrant DC motor drive uses a separately excited dc motor that has a torque constant of 1.2 Nm/A, an armature inductance of 5 mH and an armature resistance of 0.5 2. Input DC voltage is 200 V and the switching frequency is 20 kHz. All components can be assumed ideal and speed fluctuations can be ignored. The motor runs in steady state at 1125 rpm, drawing a mean current of 8 A from the DC input. Armature current is continuous. Ignore rotational losses. (i) State the relationship between armature current and input DC current in terms of switching duty factor. (ii) Determine armature current and switching duty factor. (iii) Determine electromagnetic torque. (iv) Find peak to peak ripple in the armature current.