Explanation: Widely used motor/generators such as synchronous and induction machines belong to doubly excited systems, and many other practical applications require multiply excited magnetic systems. 3. In a doubly excited magnetic system with salient pole type stator and rotor, if the rotor is not allowed to move, then the equation for magnetic field stored energy in establishing the currents from zero to is and ir is __________
A. Wfld=1/2 is2Ls+1/2 ir2Lr
B. Wfld=1/2 is2Ls+Mrs is ir
C. Wfld=1/2 is2Ls+1/2 ir2Lr+Mrs is ir
D. Wfld=1/2 ir2Lr+Mrs is ir
Answer:A
Explanation: Widely used motor/generators such as synchronous and induction machines belong to doubly excited systems, and many other practical applications require multiply excited magnetic systems. 3. In a doubly excited magnetic system with salient pole type stator and rotor, if the rotor is not allowed to move, then the equation for magnetic field stored energy in establishing the currents from zero to is and ir is __________
A. Wfld=1/2 is2Ls+1/2 ir2Lr B. Wfld=1/2 is2Ls+Mrs is ir C. Wfld=1/2 is2Ls+1/2 ir2Lr+Mrs is ir D. Wfld=1/2 ir2Lr+Mrs is ir