A Practical Primer On Motor Drives (Part 13): Motor Drive Control Architectures And Algorithms

by Ken Johnson, Teledyne LeCroy, Chestnut Ridge, N.Y., How2Power Today, Feb 17 2017

Focus:
In this part, the discussion on VFD continues with an introduction to the popular VFD control architectures and algorithms. There are three primary methods for achieving variable-frequency motor control: scalar V/Hz, six-step commutation (also known as trapezoidal control), and vector control. The latter includes vector flux- (or field-) oriented (FOC) control and vector direct torque control (DTC). One may implement all of these methods in an open loop (few or no sensor feedback signals from the motor) or closed loop (significant sensor feedback required from the motor) with various algorithms. Each of these control methods is explained here.

What you’ll learn:

• How to understand the operation of the popular VFD control architectures and algorithms including scalar V/Hz, six-step commutation, vector flux- (or field-) oriented control and vector direct torque control

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