Furthermore, the designed system is characterized by easy manufacturing and maintenance, high speed response, low cost, and does not need to program steps as compared to other systems based on Microcontroller and digital signal processor (DSP) units. Moreover, the proposed controller able to control the value of load voltage to frequency ratio, which plays a major parameter in the function of IM speed control. The proposed electronic system has ability to control the output frequency with flexible setting of lower limit to less than 1 Hz and to higher frequency limits to 55 Hz. The load power is also controlled by a novel design to produce a suitable SPWM pulse. The MOSFETs inverter switching is controlled using Sampled Sinusoidal Pulse Width Modulation (SPWM) techniques with V/F method based on Voltage Controlled Oscillator (VCO).
This paper presents an electronic design based on general purpose discrete components for speed control of a single phase induction motor drive. The experimental and simulation results show the effectiveness of the proposed AFSMC based IM drive at different operating conditions. The proposed AFSMC based IM drive is implemented in real-time using DSP board TI TMS320F28335. Moreover, an adaptive law is implemented to estimate the unknown bound of uncertainty which is obtained in the sense of Lyapunov stability theorem to minimize the control effort.
The applied fuzzy controller acts like saturation function with a nonlinear slope inside thin boundary layer near sliding surface to guarantee the stability of the system. To improve control performances, a fuzzy system is assigned as reaching control part of the fuzzy sliding-mode so that it eliminates the chattering completely despite uncertainties in the system.
In general, the boundary layer approach leads to trade-off between control performances and chattering elimination. This paper presents an adaptive fuzzy sliding-mode controller (AFSMC) based on boundary layer approach for speed controller of an indirect filed-oriented control (IFOC) of induction motor (IM) drive.
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