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Calculate the minimum value of the active power in the cylindrical rotor synchronous machine? (Eb represents armature emf, Vt represents terminal voltage, δ represents rotor angle, X represents reactance)

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Calculate the minimum value of the active power in the cylindrical rotor synchronous machine? (Eb represents armature emf, Vt represents terminal voltage, δ represents rotor angle, X represents reactance)

(a) Eb×Vt×sinδ÷X

(b) 0

(c) Eb2×Vt×sinδ÷X

(d) Eb×Vt÷X

This question was posed to me by my school principal while I was bunking the class.

My doubt stems from Induction Motors topic in portion Speed Control of Direct Current Motors & Induction Motors of Electric Drives

1 Answer

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The correct choice is (b) 0

Explanation: The real power in the cylindrical rotor machine is Eb×Vt×sinδ÷X. It is inversely proportional to the reactance. The stability of the machine is decided by the maximum power transfer capability. Its minimum value occurs for delta=0°.

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