GATE EE 2019 Set 1 — Question 20
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Electrical Machines → Three-Phase Induction Machines → Slip & Equivalent Circuit
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Question
The parameter of an equivalent circuit of a three-phase induction motor affected by reducing the rms value of the supply voltage at the rated frequency is
Correct answer
(C) magnetizing reactance
Solution
The magnetizing reactance of an induction motor is given by . The magnetizing inductance is proportional to the slope of the magnetization curve ( curve). Since flux , reducing the supply voltage at rated frequency reduces the flux density . This change in flux density moves the operating point on the magnetization curve, thereby changing the magnetizing reactance due to saturation effects. Other parameters like resistances and leakage reactances are typically assumed to be constant with respect to voltage.
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