What are the differences between a variable frequency drive (VFD) and a variable speed drive (VSD)?

A variable frequency drive (VFD) refers to AC drives only and a variable speed drive (VSD) refers to either AC Drives or DC Drives. VFDs vary the speed of an AC motor by varying the frequency to the motor. VSDs referring to DC motors vary the speed by varying the voltage to the motor.

Why not order one of our FREE Guides to Variable Speed Drives? A quick and easy guide for engineers on VSDs, set up and best practice. Follow this link.

Similar FAQs

Variable Speed Drives

Is the ABB ACS800 obsolete?

The ACS800 product types concerned are in the Classic phase since 1.7. 2017, according to the ABB life cycle model.

Read article
Variable Speed Drives

What are the Common faults on the ACS580 and how do I fix them?

As a highly popular drive, the ABB ACS580 can be found in many industrial settings, but what are its most

Read article
Variable Speed Drives

What Application is an ABB ACS580 Suitable for?

What Application is an ABB ACS580 Suitable for? The ABB ACS580 is a variable speed drive designed for a wide

Read article
Variable Speed Drives

What are the Common Faults with an ABB ACH580 and How can I Fix them?

The ABB ACH580 series is widely used for its reliability and efficiency.  However, like any complex electronic system, these drives

Read article