An AC motor drive is a frequency converter designed to control the speed and torque of an electric motor – typically 3-phase AC induction or 3-phase BLDC motors – using specifically developed control methods such as Variable-Frequency Drive (VFD) or Field-Oriented Control (FOC).
Variable Frequency Drive Working Principles
A variable frequency drive (VFD) consists of three main elements: an AC motor (usually a 3-phase induction motor), a drive controller and a user interface.
The AC motor
The AC drive controller
The AC drive interface
The advent of powerful semiconductor controllers has enabled a new class of industrial drives to be developed around AC electric motors, specifically using a variable-frequency drive (VFD). This has allowed many applications that previously required a DC motor with pulse width modulation for the accuracy to use more power-efficient three-phase AC induction motors instead. These can deliver significant energy savings across an industry, especially when combined with wireless sensing and control links as part of the Industrial Internet of Things (IIoT) delivers significant cost savings across the factory floor, while boosting productivity
AC drive block diagram
Power Management
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