In a rotating electromechanical machine, the torque developed depends on
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Answer & Explanation
Correct AnswerB. Stator field, rotor field strengths and torque angle.
Quick Explanation
Electromagnetic torque in a rotating machine is obtained from the change of magnetic coenergy with mechanical position at constant current, or equivalently from interaction of magnetic fields. Therefore it depends on electrical excitation and the position-dependent magnetic coupling/inductance described by option B.
Formula / Key Relation
Te=(∂W′field/∂θ) at constant current
Detailed Explanation
Correct Answer
B — Stator field, rotor field strengths and torque angle.
Concept and Reasoning
Electromagnetic torque in a rotating machine is obtained from the change of magnetic coenergy with mechanical position at constant current, or equivalently from interaction of magnetic fields. Therefore it depends on electrical excitation and the position-dependent magnetic coupling/inductance described by option B.
Calculation / Key Relation
Te=(∂W′field/∂θ) at constant current
Exam Takeaway
Torque comes from position-dependent magnetic coenergy.
Common Mistake
Do not treat torque as depending only on speed; speed is not the fundamental energy-conversion variable in this relation.
Quick Trick
Torque comes from position-dependent magnetic coenergy.
Common Mistake
Do not treat torque as depending only on speed; speed is not the fundamental energy-conversion variable in this relation.
Exam Tip
Torque comes from position-dependent magnetic coenergy.
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