In a doubly excited magnetic system of salient pole type stator and rotor, the reluctance torque is present only when _____________
A. both stator and rotor currents are acting
B. stator current is acting alone
C. rotor current is acting alone
D. any of the stator or rotor currents acting alone
Answer:A
In a doubly excited magnetic system of salient pole type stator and rotor, the reluctance torque is present only when _____________
A. both stator and rotor currents are acting B. stator current is acting alone C. rotor current is acting alone D. any of the stator or rotor currents acting alone
Explanation: Equation for magnetic torque is Te=1/2is2dLs/dθr+1/2ir2dLr/dθr+isirdMsr/dθr , if ir=0, Te=1/2is2dLs/dθr and if is=0, then Te= 1/2ir2dLr/dθr, and these equations for torque are called reluctance torques. 7. Which component of torque in the following equation is called the electromagnetic torque of electromagnetic energy conversion device?