Technical Information
more than meets the eye



Understanding Variable Frequency Drives

The application of VFDs to AC induction motors is one of the fastest growing practices in the industry. Advances in technology over the past decade have allowed for Variable Frequency Drives to become a cost efficient way to reduce energy costs and increase system efficiencies.
All over the world, a range of industries are finding more and more ways to apply Variable Frequency Drives to their equipment. For many businesses, understanding this technology is undoubtedly complex and requires some understanding of both the products and the application to feel comfortable in making upgrades to their equipment.
At FW, we feel the best scenario is one where the user is comfortable with the technology, knows the product is specific to their needs, and is confident in the company and support services that will there for them whenever they need it.
FW has provided an overview and some technical information regarding below. Please do contact us if you require any further specific information or would like to find out more about how FW can help.


A.C. Motor Performance with Variable Frequency Drives (VFD)

There are many suppliers of VFDs who make variable frequency equipment. Many of them make only the controller, or ‘inverter’. Thus, most of the information regarding the controller’s performance is related only to the controller. Therefore, to evaluate the attributes of a variable frequency unit it is important to understand not only the controller but the effects that the controller imposes upon the A.C. induction motor.
In applications which experience significant fluctuations in load or demand, variable frequency operation will reduce motor energy costs. However, in order to optimise economy and reliability, matching a VFD to AC induction motors requires both the specific knowledge and technical skills for the application, and an in-depth understanding of applying this technology to AC motors.