A variable frequency drive (VFD) is a device that adjusts the frequency and voltage that goes into an electric inverter-duty motor. This controls the motor’s speed, torque, and overall efficiency, which can extend the motor’s life and reduce energy costs.
Here, we’ll look at the advantages of adding a VFD to motorized applications, how VFDs work, some common examples of their use, and how Gainesville Industrial Electric Co. (GIE) can help you select the right device for your application.
The Benefits of Integration
Using a VFD-motor integration offers numerous benefits such as:
- Reduced energy consumption.
- Controlled ramp-up of voltage for softer starts and stops.
- Less mechanical stress on the motor and connected equipment.
- Increased motor service life.
- Improved automation and control.
- Motor speed and torque control.
Energy savings
Automation
Wear reduction
How VFDs Work With Motors
VFDs control an AC induction or synchronous motor’s speed, torque, and direction. They adjust frequency and voltage that go into the motor, starting it up before accelerating it to a specific speed setting. They also control deceleration and, in some models, braking. This smooths out the motor’s output so the equipment it powers will start and stop less abruptly, which results in lower mechanical stress.
A VFD takes the AC motor’s fixed voltage and frequency and converts it to DC via a rectifier bridge. From there, the VFD filters the DC voltage before converting it back into AC at the designated frequency.
Generally, VFDs control motors with pulse width modulation (PWM), determining the precise current and voltage the load receives from the power source. The result is improved device control and reduced energy consumption by either switching the load entirely on or off.
Choosing Inverter-Duty Motors
While general-purpose motors have historically been the go-to for many applications, a more recent development is the inverter-duty motor. Inverter-duty motors are designed to withstand a VFD’s increased voltage spikes while running at slow operating speeds to mitigate the risk of overheating. This further protects bearings and insulation, supplementing cooling systems.
However, motors for VFDs require shaft grounding to prevent damage to bearings by providing unwanted currents with a safe and direct path.
At GIE, we offer reliable HD Hyundai electric motors that can help you get the most from these devices.
GIE Motor and Drive Expertise
The team at Gainesville Industrial Electric Co. has expertise in matching motors with compatible VFD solutions. We can provide guidance for motor and VFD selection based on the details of your application, including choosing the most appropriate enclosure.
We also have industry knowledge to help you select solutions for HVAC, conveyor belts, pumps, and more. We stock numerous Hyundai inverter-duty motors, and provide fast shipping and comprehensive technical support to our customers across the Southeastern U.S.
Browse our complete electric motors catalog to explore the options, or request a quote for your application.
Application and Industry Use Cases
VFD-motor systems have uses across a range of industries for many applications, including systems within water treatment, manufacturing, and HVAC applications.
Some typical load types in these use cases include centrifugal pumps, conveyors, blowers, and industrial fans.
It’s important to keep these considerations in mind when selecting a VFD-motor pairing:
- Motor compatibility.
- Heat dissipation requirements.
- Electrical and power supply needs.
- VFD specifications and ratings.
- Configuration and installation.
Water
HVAC
Industrial
Agriculture
Ready to Pair Your Motor With the Right Drive?
Need a reliable VFD-motor system for your application? GEI has the resources and knowledge to help you choose the best combination of motor and VFD to optimize energy efficiency.
Browse electric motors from our selection today or request a quote for a custom solution.