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A variable autotransformer is a single-coil transformer in which two portions of the same coil are used as the primary and the secondary. Variable autotransformers are used for the same purposes as regular transformers, but handle lower voltages.n the autotransformer, a primary voltage is connected from the bottom to a specific winding known as a âtap,â and a secondary voltage is connected from the bottom to a separate winding.
A Variable Frequency Drive is a motor control device that protects and controls the speed of AC induction motors. From the VFD basics theory, we know a VFD can control the speed of the motor during the start and stop cycle, as well as throughout the running cycle by outputting adjustable frequency.It also refers to as Variable Speed Drives (VSD), Adjustable Speed drive (ASD) and frequency inverter.ariable frequency drives are widely used to control the speed of ... Variable frequency drive in HVAC ... Variable frequency drives (VFD) have been used for HVAC systems in buildings for more than 40 years.