| $\dot s$ | ||||||||
| s | NL | NM | NS | Z | PS | PM | PL | |
| NL | -1 | -1 | -1 | -1 | -0.66 | -0.33 | 0 | |
| NM | -1 | -1 | -1 | -0.66 | -0.33 | 0 | 0.33 | |
| NS | -1 | -1 | -0.66 | -0.33 | 0 | 0.33 | 0.66 | |
| Z | -1 | -0.66 | -0.33 | 0 | 0.33 | 0.33 | 1 | |
| PS | -0.66 | -0.33 | 0 | 0.33 | 0.66 | 1 | 1 | |
| PM | -0.33 | 0 | 0.33 | 0.66 | 1 | 1 | 1 | |
| PL | 0 | 0.33 | 0.66 | 1 | 1 | 1 | 1 | |
This paper focuses on the dynamical analysis of the permanent magnet asynchronous motor with the aim of subsequently designing effective robust control laws for the indirect field-oriented control (IFOC) devices. We first perform some tasks which demonstrate the existence of chaos phenomenon in the IFOC using relevant indicators such as phase portraits, bifurcations diagrams and Lyapunov exponents. Chaotic signature and some striking transitions are revealed such as period-doubling, torus, period-adding and chaos when an accessible parameter of the IFOC motor is changed. More interestingly, a certain range of the parameter space corresponds to the transient chaos. This behavior was not reported previously and can be considered as an enriching contribution. Secondly, due to the great interest to reduce the upper bound of uncertainties and interference, conventional sliding mode control (SMC) has been abundantly investigated for fault-tolerant control (FTC) systems. However, this approach presents several drawbacks in terms of overshoot, less robustness, transient state error, large chattering and speed of convergence that limit its use for industrial applications. For these reasons, the integral sliding mode control (ISMC) and the fuzzy sliding mode control (FISMC) are proposed to keep the IFOC motor in the regular operation zone. The optimal feedback gains and a sufficient condition are proposed for the stability of the overall IFOC system is drawn based on the linear quadratic regulator (LQR) method. To highlight the effectiveness and applicability of the proposed control scheme, numerical simulation results are presented. This analysis allows us a great knowledge of engineers for interpreting the operation of the IFOC motor. To highlight the effectiveness and the applicability of the proposed control scheme, numerical simulations results are presented and clearly demonstrated the feasibility of these techniques.
| Citation: |
Table 1. Fuzzy rules extracted for the TS fuzzy logic system
| $\dot s$ | ||||||||
| s | NL | NM | NS | Z | PS | PM | PL | |
| NL | -1 | -1 | -1 | -1 | -0.66 | -0.33 | 0 | |
| NM | -1 | -1 | -1 | -0.66 | -0.33 | 0 | 0.33 | |
| NS | -1 | -1 | -0.66 | -0.33 | 0 | 0.33 | 0.66 | |
| Z | -1 | -0.66 | -0.33 | 0 | 0.33 | 0.33 | 1 | |
| PS | -0.66 | -0.33 | 0 | 0.33 | 0.66 | 1 | 1 | |
| PM | -0.33 | 0 | 0.33 | 0.66 | 1 | 1 | 1 | |
| PL | 0 | 0.33 | 0.66 | 1 | 1 | 1 | 1 | |
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Phase portraits of system (2) in the plane
Bifurcation diagram (a) and Lyapunov exponent (b)
Time evolution of the trajectory
Input membership functions of the fuzzy system
External disturbance
Histogram of external disturbance
State trajectories of the IFOC when the controller is deactivated; (a) the direct axis of the rotor flux, (b) quadrature axis component of the rotor flux, (c) rotor speed error, (d) quadratic axis stator current
Time evolution. (a) quadratic, (b) direct flux rotor, (c) speed of the rotor, (d) quadratic stator current under the ISMC
The evolution of the
Time evolution. (a) quadratic, (b) direct flux rotor, (c) speed of the rotor, (d) quadratic stator current under the FISMC
Fuzzy integral sliding mode controller
Performance index of the ISMC and FISMC
IAE of ISMC and FISMC