An AC drive is a device that is used to control the speed of an electrical motor, either an induction motor or a synchronous motor. AC drives are also known by various other names such as adjustable speed drives (ASD) or variable frequency drives (VFD) . Industrial machinery is often driven by electrical motors that have provisions for speed adjustment. Such motors are simply larger, more powerful versions of those driving familiar appliances such as food blenders or electric drills. These motors normally operate at a fixed speed.
If speed control is required, that controller is called a (variable speed) AC drive. AC drives are used in a wide variety of industrial applications.
If speed control is required, that controller is called a (variable speed) AC drive. AC drives are used in a wide variety of industrial applications.
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