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Question

The full load torque angle of a synchronous motor at rated voltage and frequency is 30electrical. The stator resistance is negligible. The torque angle if load torque and terminal voltage are kept constant and excitation and frequency are increased by 10% is _____elec.degrees.
  1. 33.36

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Solution

The correct option is A 33.36
Pm=VtEfXdsinδ=VtEfXdsin30

Tm=VtEfωsXdsin30

Tm=Vt×1.1Ef1.1ωs×1.1Xdsinδ=VtEfωsXdsin30

sin δ=1.1 sin30o

δ=sin1(0.55)

δ=33.36o

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