VFDs are developed to supply variable speed manage. They preserve the optimal speed needed for an application to improve production and save power. Low- and medium-voltage drives steadily accelerate and decelerate motors and pumps, assisting shield mechanical elements and extend their life, whilst decreasing inrush currents, which assists save power. VFDs are utilized inside a broad selection of industries and applications?aincluding HVAC, water and wastewater, and oil and gas.
VFDs are a critical component of motor speed control. They improve efficiency, reduce wear on mechanical components and improve system performance. Fundamentally, they are used to control the frequency and voltage supply to the motor and match the application’s speed requirements.
All VFDs are going to take 3 phase AC power and convert that 3 phase power to DC power inside the drive and pulse it out in a simulated AC wave form to the motor. The motor still thinks it has AC power but the DC power conversion now lets us control the speed of the motor without harming it. Now we are in control to save energy and money.
Variable frequency drives are widely used in many areas such as fan, pump, compressor, elevator, tower crane, CNC, paper making machine and more. There are many benefits of applying frequency inverter:
Saving energy: when your production don't need the motor to run at full speed, then you can use a variable frequency drive to adjust the motor running speed, so energy can be saved during the process.
Improving the control accuracy: in variable torque or tension control applications, the production needs variable toruqe or tension, such as paper-making industry, textile industry and etc. By using a frequency inverter, it can help users to control the torque or tension accurately according to the application requirements. Therefore, the production efficiency can be greatly reduced.
Reducing the maintenance cost of your equipments: when your production control system is without a frequency inverter, the motor will start instantly with large current which is harmful to your mechanical equipments. A frequency inverter which is developed with motor soft-start function can prevent this phenomena, so the equipment wear will be reduced and the equipment maintenance cost will be decreased also.
How much can you save using a VFD?
In these centrifugal pool pumps, (according to energy conservation experts) energy consumption is proportional to the cube of the flow rate. In plain English that means that even small reductions in speed and flow can result in significant energy savings. In pool applications, significant energy and cost savings can be achieved by reducing the operating speed when the filters are clean, or when the pool is experiencing off-peak loads.
How great are the savings?
A motor running at 50% of full speed capacity has a motor torque of 25% of full speed. In addition, electricity required to operate the motor at 50% of full speed is 12.5% of the amount of electricity required if the motor was running at 100% full speed capacity. Thus, reducing motor speed can significantly reduce the electrical energy consumption.
Plenty of applications which will save a lot of power by installing a VFD (Main, secondary air, exhaust/flue gas extractor fan, cooling pumps for certain, motors utilized for automatic adjustment of parameters). Anyway, in case from the plant/motor is utilized for energy balance regulation when the load is most likely to increase/decrease much more often, you are able to set up a VFD for saving energies. In case your plant is operating below nominal speed a lengthy time, the power saving using the motor is really a minor issue for you personally. The large loss will come from other points like electrical energy consumption, motor efficiency, upkeep and so on. Fitting a VFD for such motor won't assist as well a lot.
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