(Solved):   Example on DC motor power flow A 240-V DC shunt motor draws 420 A when the output power is ...

 

Example on DC motor power flow A 240-V DC shunt motor draws 420 A when the output power is \( 92504 \mathrm{~W} \). The motor parameters are \( R_{A}=0.01252 \Omega \) and \( R_{r}=32 \Omega \). Determine (a) The copper losses (b) The rotational losses \( \rightarrow \) Prot (c) The motor efficiency \( >\eta=\frac{P_{0}}{P_{0}} \) [Ans : \( 3930 \mathrm{~W} ; 4365.85 \mathrm{~W} ; 91.8 \% \) ]