Abstract
The adequate control of stator currents is a fundamental requirement for several high-performance induction motor (IM) control schemes. In this context, classical linear controllers remain widely employed due to their simplicity and success in industrial applications. However, the models and methods commonly used for control design lack valuable information, which is fundamental to guarantee robustness and high performance. Following this line, the design and existence of linear fixed controllers is examined using individual channel analysis and design. The studies presented here aim to establish guidelines for the design of simple (time invariant, low order, stable, minimum phase, and decentralized) yet robust and high-performance linear controllers. Such characteristics ease the implementation task and are well suited for engineering applications, making the resulting controllers a good alternative for the stator current control required for high-performance IM schemes such as field-oriented, passivity-based, and intelligent control. Illustrative examples are presented to demonstrate the analysis and controller design of an IM, with results validated in a real-time experimental platform. It is shown that it is possible to completely decouple the stator current subsystem without the use of additional decoupling elements.
Highlights
I NDUCTION motors (IMs) have been historically recognized as the workhorse of the industry
The most successful field-oriented control (FOC) schemes aim to modify the behavior of an IM so that it resembles a dc motor, where the rotor flux and the torque are separately manipulated as they are naturally driven by different physical currents
It should be noted that the proposed individual channel analysis and design (ICAD) controller has been implemented without back-electromotive force (EMF) compensation
Summary
I NDUCTION motors (IMs) have been historically recognized as the workhorse of the industry. Their employment as actuators provides the preferred choice for a number of industrial and research applications. Field-oriented control (FOC) has been the most popular [1]. The most successful FOC schemes aim to modify the behavior of an IM so that it resembles a dc motor, where the rotor flux and the torque are separately manipulated as they are naturally driven by different physical currents (i.e., field and armature). Since IMs do not share such a physical construction, the decoupling of the rotor flux and the torque is achieved by introducing nonlinear control elements that generate virtual flux- and torque-producing currents [1]–[3]
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