Question

i. The speed of a separately excited dc motor is controlled by a one-phase full-wave converter. The field circuit is also controlled by a full-wave converter, see V supply) Vs pk-150V Ra-0.310 L Rf 152O E-63V α. 1-35A Figure 3 The AC supply voltage to the armature and field converters is one-phase, 150Vpeak, 50Hz. The armature resistance Ra-0.31Ω, the field circuit resistance Rf-152Ω, and the motor voltage constant is Kv-1.3V/A. The armature current corresponding to the load demand la-35A The inductances of the armature and field circuits are large enough to make the armature and field currents continuous and ripple-free. Consider the firing angle of the field converter f-60. The motor is coupled to a load via a gear box having gear ratio Gr 1.4, the inertia of the load is Ji- 40kg.m2 With ii. Calculate the armature voltage firing angle aa in order to achieve a back emf Ea- 63V [7 marks] [3 marks] [5 marks] [6 marks] [4 marks] 111, Determine the value of the field current If iv. Find the reflected inertia the motor is subjected to V. Calculate the angular velocity ωL of the load vi. Find the torque td delivered by the motor

Answer 1

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2 っ0.99 1 -3 Scanned with CamScanner