Fundamentals Of Electric Drives By Gk Dubey Solutions Page

Finding reliable solutions for Fundamentals of Electrical Drives " by G.K. Dubey

A separately excited DC motor has ( R_a = 0.5 \Omega ), ( K_\phi = 1.2 , V/rad/s ). It is fed from a class-A chopper operating at 500 Hz from a 200V DC source. The duty cycle (( \alpha )) is 0.6. If the load torque is 10 Nm, calculate the motor speed and the peak-to-peak ripple current. Fundamentals Of Electric Drives By Gk Dubey Solutions

Stator voltage control, V/f control, and rotor resistance control. The duty cycle (( \alpha )) is 0

The back EMF equation: ( V_a = E_b + I_a R_a ). We need ( I_a ). For steady state, motor torque ( T_e = K_\phi I_a = T_L ) (10 Nm). [ I_a = \frac{T_L}{K_\phi} = \frac{10}{1.2} = 8.333 , A ] The back EMF equation: ( V_a = E_b + I_a R_a )

Speed is 922 RPM, ripple current is 2.4A. A complete solution would then discuss whether the current is continuous (Is ( I_{min} = I_a - \Delta I/2 > 0 )? Yes, ( 8.33 - 1.2 > 0 )).