Used and surplus VFDs for sale. MRO Exchange stocks a continuously updated inventory of variable frequency drives available for immediate purchase and fast nationwide shipping.
Variable frequency drives, commonly called VFDs, are electronic controllers that regulate the speed and torque of AC electric motors by varying the frequency and voltage of the power supplied to the motor. They are used across virtually every sector of industrial manufacturing, from controlling pump and fan speeds in process applications to managing conveyor systems, compressors, and machine tool spindles. A VFD reduces energy consumption, extends motor life, and gives operators precise control over motor speed without mechanical intervention.
MRO Exchange carries surplus and used VFDs from leading industrial manufacturers. Our inventory includes drives across a wide range of horsepower ratings, input voltages, and enclosure types suitable for both standalone motor control and integrated automation systems. Sourcing a surplus VFD is a practical and cost-effective alternative to new, particularly for replacement applications where the drive rating and communication requirements are already defined by the existing installation.
Who buys used VFDs? Maintenance and reliability technicians replacing a failed drive to restore production quickly. Facilities engineers reducing capital spend on motor control upgrades across aging equipment. Machine builders and systems integrators sourcing drives for new installations at below-distributor pricing. Plant electricians sourcing a direct replacement for a discontinued drive model no longer available through standard channels.
Frequently asked questions about surplus VFDs:
What is a VFD used for? A variable frequency drive controls the speed of an AC motor by adjusting the frequency and voltage of its power supply. Common applications include pumps, fans, compressors, conveyors, and machine tool axes where variable speed control improves efficiency, reduces wear, or is required by the process.
Are used VFDs reliable? Yes, when sourced from a seller who provides accurate condition grading and complete model documentation. MRO Exchange lists the manufacturer, model number, and condition for every VFD in our inventory so buyers can verify compatibility before purchasing.
How do I select the correct VFD for my application? Match the drive to your motor's horsepower or kW rating, input voltage, and output frequency requirements. Also confirm communication protocol compatibility if the drive will be integrated into a PLC or automation system. When in doubt, reference your motor nameplate data and existing control documentation.
Does MRO Exchange carry discontinued VFD models? Yes. Discontinued and hard-to-find variable frequency drives are a regular part of our surplus inventory. If you are looking for a specific model not currently listed, contact us directly.
What is the difference between a VFD and a servo drive? A VFD controls standard AC induction motors and is typically used for variable speed applications where precise positioning is not required. A servo drive controls servo motors in closed-loop systems where precise position, speed, and torque control are critical. The two are not interchangeable.
Every VFD listed on MRO Exchange ships nationwide from our facility in Illinois. Whether you are a maintenance technician replacing a failed unit, a facilities engineer managing motor control costs, or a systems integrator sourcing drives for a new installation, MRO Exchange is your source for surplus variable frequency drives at prices well below new distributor cost.
