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Midwest Blog




Variable Frequency Drive
Wednesday, December 5, 2018

Variable frequency drives (VFDs) are motor controllers that are used to drive electric motors by altering the voltage and frequency supplied to them. Variable speed drives, adjustable speed drives, adjustable frequency drives, AC drives and inverters are other names used for variable frequency drives.

Frequency has a direct relation with the speed of the motor or its RPMs. The higher the frequency, the higher the speed of the motor will be. If a motor is used in an application which doesn’t require it to operate at maximum speed, a VFD can decrease the voltage and frequency to meet its requirements. As the speed requirements of the application change, the VFD will simply turn down or up the speed of the motor to meet its requirements. In this post, we’ll explain why a VFD should be used.

1. Reduces Energy Consumption and Costs

If you are running a specific application that doesn’t need the motor to operate at maximum speed, you can reduce energy consumption by operating the motor using a VFD. With the help of a VFD, you can operate the motor-driven application as per its specific requirements. You can control the motor’s speed and reduce the energy consumption. No other control mechanism can help you accomplish this.

In industry, electric motor applications consume over 65 percent of the total power. Optimizing motor controlling systems by using variable frequency drives can reduce consumption of energy in facilities by 70 percent. Furthermore, using VFDs improves quality of production and reduces the cost of production.

2. Increase Production

When you operate the motors at most efficient speeds for the applications, mistakes will be less likely to occur. On belts and conveyors, you’ll be able to eliminate jerks allowing greater through put. Thus, production will increase which will earn your business higher revenues.

3. Reduce Maintenance and Extend the Life of Equipment

When you control your equipments through variable frequency drives, they’ll experience less downtime because of maintenance and will last much longer. As variable frequency drives allow better control of a motor’s voltage and frequency, they will provide better protection from issues like thermal overloads, overvoltage, under voltage etc.

When a load is started with an adequate VFD, the motor or the load itself won’t be subject to shock at the start-up. It will start in a smooth manner thereby eliminating gear, bearing and belt wear. It’s also a great way to eliminate or reduce water hammer as you can have smooth accelerate cycles and deceleration cycles.

If you are looking for top quality variable frequency drivers, you can find them at Midwest Equipment. We offer VFDs from ¼ to 3 horsepower. Check out our product catalogue and let us know if you need additional assistance.


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