GATE EE 2015 Set 1 — Question 44
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Electrical Machines → Inverters → Harmonics in Inverters
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Question
A 3-phase square wave (6-step) VSI feeds a 3-phase, 4 pole induction motor. The VSI line voltage has a dominant harmonic component. If the operating slip of the motor with respect to fundamental component voltage is , the slip of the motor with respect to harmonic component of voltage is ________.
Correct answer
1.16 to 1.22
Solution
1.For a 6-step VSI, the harmonic is backward rotating. Its synchronous speed is .
2.Rotor speed .
3.Slip with respect to harmonic: .
Wait, the standard formula for harmonic slip is . For (backward), .Continue learning with Success Tracker
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