GATE EE 2015 Set 1 — Question 54
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Electrical Machines → Inverters → Harmonics in Inverters
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Question
A 3-phase 50 Hz 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 0.04, the slip of the motor with respect to harmonic component of voltage is ___________.
Correct answer
1.16 to 1.22
Solution
The synchronous speed for the fundamental component is . Given a slip , the rotor speed is . In a 6-step VSI, the harmonic has a negative phase sequence (it rotates in the opposite direction to the fundamental), so its synchronous speed is . The slip with respect to the harmonic is .
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