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Variable frequency drives (VFDs) are common in most industrial motor applications, including pumping, compressing, blowing, conveying, extruding and mixing. When motors are started across the line on 60Hz utility power, efficient motor operation is limited to a very narrow window around the rated motor operating speed and torque values. Drives allow motors to operate at their optimal efficiency over a wide range of speeds, satisfying a wide range of varying torque requirements, while reducing motor stress and starting inrush current.

Learning Objectives

• Review the fundamentals of variable frequency drives and motor insulation reliability considerations, including reflected wave.
• Understand multi-level cascaded output medium-voltage drives.
• Learn about resonance and motor insulation reliability considerations and the need to reduce risk of insulation breakdown.

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