Induction Machine Control for a Wide Range of Drive Requirements

Abstract

In this paper, a method for induction machine (IM) torque/speed tracking control derived from the 3-D non-holonomic integrator including drift terms is proposed. The proposition builds on a previous result derived in the form of a single loop non-linear state controller providing implicit rotor flux linkage vector tracking. This concept was appropriate only for piecewise constant references and assured minimal norm of the stator current vector during steady-states. The extended proposition introduces a second control loop for the rotor flux linkage vector magnitude that can be either constant, programmed, or optimized to achieve either maximum torque per amp ratio or high dynamic response. It should be emphasized that the same structure of the controller can be used either for torque control or for speed control. Additionally, it turns out that the proposed controller can be easily adapted to meet different objectives posed on the drive system. The introduced control concept assures stability of the closed loop system and significantly improves tracking performance for bounded but arbitrary torque/speed references. Moreover, the singularity problem near zero rotor flux linkage vector length is easily avoided. The presented analyses include nonlinear effects due to magnetic saturation. The overall IM control scheme includes cascaded high-gain current controllers based on measured electrical and mechanical quantities together with a rotor flux linkage vector estimator. Simulation and experimental results illustrate the main characteristics of the proposed control.

Dynamic Energy Efficient Control of Induction Machines Using Anticipative Flux Templates

“…The figure displays the solution to the optimization problem with the given parameters. In conventional approaches such as [15][16][17]21], the optimization interval is chosen in such a way that the torque step occurs at the beginning of the optimization interval, that is at time t = 0. In contrast, the main idea of this paper is to modify the optimization interval such that the torque step occurs later in the optimization interval at time t > 0.…”

“…A simple suboptimal online method based on the steady state solution was discussed in [16,17]. An alternative solution based on a filtered flux linkage setpoint in the transient regime was discussed in [18].…”

Frequency Converter as Node for Edge Computing of Big Data, Related to Drive Efficiency, in Industrial Internet of Things

“…), • settings and operating modes of frequency converters (depending on the user experience and the characteristics of the required operating parameters of the drive, such as: starting and braking ramps, operating modes, current limits, brake parameter settings etc.). The most energy-consuming stages in the operation of electric drives are transients in the phases of start-up, braking and dynamic changes of the external load [8][9][10]. The build-up of magnetic fields and the reverse electromotive force (or the reverse electromotive force itself) during the drive start-up introduces transients into the electrical system.…”

Model Predictive Base Direct Speed Control of Induction Motor Drive—Continuous and Finite Set Approaches

“…One of the most popular is an induction motor (IM). This is because of multiple reasons [1][2][3][4][5]. They are cheap in manufacturing and services, and IMs are very robust under different operational and environmental factors.…”