Variable Frequency Drive (VFD) is being used to drive a 6-pole AC induction moto

Question

Variable Frequency Drive (VFD) is being used to drive a 6-pole AC induction motor. Determine the frequency that is required to drive the AC Induction motor with the synchronous speed ns. Please show work and select right answer option.

Problem 15: A variable Frequency Drive (vFD) is being used to drive a 6-Pole AC Induction motor. Determine the frequency that is required to drive the AC Induction motor with the synchronous speed ns. (Hint: What is the Sy speed of an AC nchronous Induction Machine?) Induction Motor 480 V RMS VFD M Synchronous Speed 3 Phase 700 RPM 60 Hz D. 30 Hz A. 40 Hz E. 50 Hz B. 45 Hz C. 35 Hz

Explanation / Answer

we know that synchronous speed of induction motor Ns = 120 * f / P

given Ns = 700

poles P = 6

therefore frequency = ( P * Ns ) / 120 = 6 * 700 / 120 = 35 HZ

option C is correct

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