As shown in the figure below, this is a speed regulation method for DC separately excited motor. a) What is the speed regulation method? (score:2); b) What are the characteristics for this speed regulation method? (score:4)
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A separately-excited dc motor in Figure 2 with Ra = 5 ̐ and La = 300 mH, is to speed controlled using class-A dc chopper. The dc supply Vd = 100 V. Ignoring the effects of armature inductance La; i. Draw the speed torque characteristics for the motor for duty cycle of both 1 and 0.5, given the motor constant Ke ̕ = 0.7 (V/rpm). ii. Find the speed of the motor (̑) at a torque of 5 Nm applied on the motor shaft when the duty cycle used is 0.5.
Adi S.
Madhur L.
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