What is a Variable Frequency Drive?
How does a VFD Work?
- Do you have ac motors in your facility?
- Do these motors need a variable output?
- Do you use mechanical means to vary the output?
If you anwsered yes to these questions, you need to install variable frequency drives on these ac motors.
If you are not using VFD’s you are wasting energy and throwing money out the window.
Many utilities are now offering rebates for the installation of VFD’s or retro-fitting existing equipment with variable frequency drives. Contact your local utility or search VFD rebate or go to the DSIRE website, a comprehensive source of information on state, local, utility and federal incentives and policies that promote renewable energy and energy efficiency.
Joliet Technologies has partnered with Electrical Solutions Network (ESN), in our effects to promote energy efficiency through the use of variable speed drives.
What is a VFD?
By: Dave Polka
You can divide the world of electronic motor drives into two categories: AC and DC. A motor drive controls the speed, torque, direction and resulting horsepower of a motor. A DC drive typically controls a shunt wound DC motor, which has separate armature and field circuits. AC drives control AC induction motors, and-like their DC counterparts-control speed, torque, and horsepower.
Application As An Example
Let’s take a brief look at a drive application. In Fig. 1, you can see a simple application with a fixed speed fan using a motor starter. You could replace the 3-phase motor starter with Variable Frequency Drive (VFD) to operate the fan at variable speed. Since you can operate the fan at any speed below its maximum, you can vary airflow by controlling the motor speed instead of the air outlet damper.