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What Is a VFD or AC Drive? From AutomationDirect
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Have you ever wondered how automation-based industries achieve variable speed control and maximize energy efficiency for their AC motors? They accomplish this with variable frequency drives (VFDs) or AC Drives. Check out this video to learn more about VFDs and the options we carry at AutomationDirect.com!
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Have you ever wondered how automation-based industries achieve variable speed control and maximize energy efficiency for their AC motors? They accomplish this with variable frequency drives (VFDs) or AC drives. So what exactly is a VFD? A VFD rectifies AC line voltage to DC, stores it, and then inverts it back to a controllable AC waveform. They’re best used where speed control is desired and energy efficiency is crucial. Slowing a motor speed by just 25% can provide up to 50% in total energy savings! A VFD controls an AC motor’s speed and torque by adjusting the input frequency and voltage to 3-phase AC induction, permanent magnet, or synchronous motors. They also provide overload protection, start/stop control, change of direction, and adjustable acceleration/deceleration making them a requirement for modern motor control applications! A VFD provides selectable control modes to modulate the voltage, frequency, and other electrical characteristics of the motor. The most common control methods are Voltz per Hertz and sensorless vector control. Volts per Hertz is the most common control method because it uses normal induction motors and can operate basic applications with minimal change to drive parameters. Sensorless vector control yields a much higher performance using known or measured characteristics like efficiency, slip and power factor, and motor speed or position feedback. This mode is typically used when high torque and high precision stable operation is required from low speeds up to the base speed of the motor. Lastly, full vector control requires speed feedback from the motor and provides the most accurate control, including full torque at zero speed. VFDs are sized based on amperage, energy savings, power quality, torque requirements and functionality. At AutomationDirect, we carry VFDs from many different brands including Durapulse, Ironhorse, and WEG. From 1/2hp to 300hp, 120V to 600V, Wet or outdoor environments, Simple vs advanced control schemes; no matter your needs and budget, we’ve got you covered. With so many different product options, how do you know which is right for your application? We have comprehensive manuals and selection guides, as well as free downloadable white papers and eBooks to learn all about these topics. We also have free tech support, so if you have questions after purchase, we are here to help! For more information on the VFDs and accessories we carry, visit us today at AutomationDirect.com! Click here to learn more about our VFD selections! Click here to see more videos.
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