The variable frequency drive (VFD) is the most effective motor controller in the industry today. Modern VDFs are affordable and reliable, have flexibility of control, and offer significant electrical savings through greatly reduced electric bills.
VFDs provide soft-start capabilities which decrease electrical stresses and line voltage sags which are associated with full voltage motor start-ups, especially when driving high-inertia loads. We recommend the variable speed drive to all customers as they provide the optimum performance in terms of extraction, operating cost and purchase cost.