Variable frequency drives are also known as variable speed drives, VFD's, inverters, adjustable frequency drives, motor controllers, AC drives and microdrives.
Variable frequency drives (VFD's) adjust your motor speed to closely match output requirements, typically resulting in energy savings of 10 to 50 percent.
Variable frequency drives save energy. One way they do this is by reducing motor speed as demand decreases.
Are you looking for a drive to run your three phase motor on single phase power? Our TECO EV/JNEV Series is our most popular single phase input AC drive. This is the ideal drive for hobbyists because it is low cost, readily available from stock and easy to use!
If you require a NEMA 1, general purpose drive then we would recommend our AC Tech Lenze SMVector series. Loaded with features yet still competitive, we can ship from stock today!
Are you working on an HVAC application?
Marshall Wolf Automation carries a full offering of variable frequency drives tailored for the HVAC market. We also have in-house tech support available to help you choose the best drive.
Do you need your variable frequency AC drive installed in an enclosure? We can do that too! We carry the popular Saginaw line of industrial enclosures and can add other components as well.
You can also take a look at this spreadsheet - we list our popular AC drives as well as the properly sized enclosure to go with it!
Marshall Wolf Automation also specializes in the NEMA 3R market for drive panel enclosures and pump panels.
Take a look at NEMA 3R applications we have already solved!
Frequently Asked Questions Regarding Variable Frequency Drives:
Can I use a single phase motor with your variable speed drives?
No. All variable frequency drives work with 3 phase motors only. Single phase drives will operate on single phase power, however, the output is still 3-phase and will require a 3-phase motor.
How do I choose the proper size variable frequency drive (VFD)?
For most applications you want a variable frequency drive that has an output rating that equals or exceeds the nameplate current rating of the motor. If you base your selection on the motor horsepower rating you might get a VFD that is too small. For severe or unique applications please contact our in-house technical department.
How will using a variable frequency drive (VFD) save me money?
If you have an AC motor drive application that does not need to always run at full speed then you can reduce energy costs by controlling the motor with a variable frequency drive. VFD's allow you to match the speed of the motor to the requirements of your process. Basically variable speed drives allow you to consume less energy when your load requirements are less than full speed. Ideal in HVAC applications.
Variable speed drives also gradually ramp the motor up to operating speed which avoids abruptly starting the motor. This will reduce the stress on the motor and extend the life of the driven equipment and motor.