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The magnitude of electromagnetic or interaction torque, in all rotating machines, is given by ____________

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The magnitude of electromagnetic or interaction torque, in all rotating machines, is given by ____________

(a) Te ∝ (stator field strength)sinδ

(b) Te ∝ (rotor field strength)sinδ

(c) Te ∝ (stator field strength)(rotor field strength)sinδ

(d) Te ∝ sinδ

This question was posed to me in exam.

My query is from Torque Production and Dynamic Equations topic in chapter Basic Concepts in Rotating Machines of Electrical Machines

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The correct choice is (c) Te ∝ (stator field strength)(rotor field strength)sinδ

The explanation: The tendency of two fields (stator field and rotor field), to align themselves in the same direction, is called interaction torque, and it also depends on the torque angle & delta;.

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