Q4: a DC motor is driven off a step-up chopper supplied by 70-V DC source. The motor has ko=1.2 Nm/A, La=40 µH, and Ra=0

[answerhappygod]

Q4 A Dc Motor Is Driven Off A Step Up Chopper Supplied By 70 V Dc Source The Motor Has Ko 1 2 Nm A La 40 Uh And Ra 0 1 (168.62 KiB) Viewed 9 times

Q4: a DC motor is driven off a step-up chopper supplied by 70-V DC source. The motor has ko=1.2 Nm/A, La=40 µH, and Ra=0.15 0. Q4a) [8 marks] Calculate the minimum switching frequency to ensure continuous-mode operation as little an armature current as 20 A, at 573 rpm. Show your work and list final results in Table 11. Q4b) [11 marks] Calculate the torque and a maximum and minimum input currents if the duty cycle of the step-up chopper is adjusted to 0.25 at 573 rpm and the frequency calculated in part (a). Show your work and list final results in Table 12. Table 12 TN.m Imax (A) Table 11 F, Hz Imin (A)