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A new speed sensorless control system for an induction motor with predictive current controller is presented. An adaptive observer system with high robustness against parameters variation is used for the control approach. The new observer computes a back EMF correctly even at zero speed and zero frequency. The current predictive controller is improved by utilizing the new observer system for different...
A Direct Stator Flux and Torque Control (DSFTC) scheme for asymmetrical six-phase induction motor drives is discussed in this paper. The induction machine has two sets of stator three-phase windings spatially shifted by 30 electrical degrees with isolated neutral points. The proposed control strategy is very simple and it is based on Proportional Integral (PI) regulators implemented in the stator...
A Space Vector based PWM scheme for 4-level inverter is proposed. 4-level inversion is achieved by connecting two 2-level inverters in open-end winding configuration. The individual inverters are fed with asymmetric DC link voltages. The proposed scheme does not use sector identification method to find the sub hexagon, which encloses the tip of the reference space vector. During 3-level operation,...
This article presents speed controlling for single phase induction motor. Principally, 9-level, diode-clamp inverter used to control voltages per frequency is widely used because of its high efficiency to control the motor. In this article, ARM7 model ADU7024 is used as microcontroller to generate eight pulse signals and send to the output voltage amplifier by co-connecting to the modulation module...
The linear induction motor (LIM) drives using conventional direct thrust control (DTC) schemes have drawbacks of large thrust ripples in low speed range and so on. In this paper, the thrust ripples of the DTC-based LEVI drives are theoretically analyzed. A novel switching scheme using synthesized voltage vector and magnitude modulation method is proposed to replace the conventional switching table...
This paper presents a simple overmodulation strategy to achieve high torque capability for a wide speed range using a hybrid DTC scheme. The hybrid DTC drive incorporates both DTC-hysteresis and Direct Self Control (DSC) operations. In the proposed method, the control of circular flux locus is changed to the hexagonal when the motor operates under acceleration condition. By controlling the locus flux...
This paper deals with energy optimal control of induction motor dives. When motor operate at given steady-state operation point, the optimum control efficiency is acquired by seeking the different voltage-frequency ratio so that the active power absorbed by the motor is minimization, that is improve operational efficiency and achieve the purpose of energy saving. But the minimum active power also...
Among all control methods for induction motor drives, Direct Torque Control (DTC) seems to be particularly interesting being independent of machine rotor parameters and requiring no speed or position sensors. The DTC scheme is characterized by the absence of PI regulators, coordinate transformations, current regulators and PWM signals generators. In spite of its simplicity, DTC allows a good torque...
This paper presents a simple speed control method of an asymmetrical parameter type two-phase induction motor drive using a three-leg voltage source inverter (VSI). The two-phase induction motor is adapted from an existing single-phase induction motor resulting in impedance unbalance between main and auxiliary windings. Thus in order to improve the performance it needs an unbalanced phase supply....
Variable voltage and frequency supply to a.c drives is invariably obtained from a three-phase voltage source inverter. A number of Pulse width modulation (PWM) schemes are used to obtain variable voltage and frequency supply. The most widely used PWM schemes for three-phase voltage source inverters are carrier-based sinusoidal PWM and space vector PWM (SVPWM). There is an increasing trend of using...
This paper presents implementation of space vector pulse width modulation (SVPWM) technique for three phase voltage source inverter (VSI) using field programmable gate array (FPGA). Variable voltage and frequency supply to ac drives is invariably obtained from a three phase voltage source inverter. A number of pulse width modulation scheme is used to obtain variable voltage and frequency supply. The...
In this paper, an application of the fuzzy logic scheme for direct torque fuzzy control (DTFC) of an Induction Motor (IM) AC drive is proposed. The proposed DTFC is based on fuzzy logic technique switching table is described and compared with conventional direct torque control (DTC). The comparison with DTC shows that the use of the DTFC reduces the torque, stator flux, and current ripples. The proposed...
This paper describes the implementation of multirate sampling technique for 3-level carrier space vector pulse width modulation based direct torque control (CSVPWM DTC) of induction motor (IM) drive with an objective to reduce the electromagnetic torque ripple for medium to high power applications. The benefit of the proposed multirate technique for 3-level CSVPWM DTC based IM drive; it gives lower...
In this paper a high performance advanced discontinuous PWM (ADPWM) algorithm for direct torque controlled (DTC) induction motor drive is proposed. The proposed ADPWM method uses a special category of DPWM sequences (0121 and 7212), because of which the performance of the drive improves in terms of the inverter switching losses. Also, significant reduction in line current distortion during high speed...
This paper discusses the performance of a single-phase induction motor drive under nominal load in a closed-loop vector-controlled system. The control strategy to be applied is known as indirect field oriented control. Single-phase induction motor when operating as two-phase motor has its dynamic performance increased. With the use of a standard three-phase voltage-source inverter, space vector pulse...
This paper presents the experimental test results of the independent drive characteristics of two three-phase induction motors (IMs) fed by a five-leg inverter (FLI). To drive two motors independently, the system connected one motor to one three-phase voltage source inverter (three-VSI) is generally used and is required two three-VSIs. Therefore, twelve and ten-switching devices are necessary in the...
Several works have been reported in the literature on multilevel inverters topologies, control techniques and applications. However, there are few works that actually discuss or evaluate the performance of induction motor drives associated to three-phase multilevel inverter. This paper presents then a comparison study for a cascaded H-bridge multilevel DTC induction motor drive. In this case, symmetrical...
In this paper, a space vector pulse width modulation (SVPWM) scheme for open-end winding induction motor based, 3-level inverter is presented. 3-level inversion is achieved with dual 2-level inverters feeding an open-end winding induction motor drive. The proposed PWM signal generation does not use any sector identification. It does not use look- up tables for generating the switching vectors for...
This paper presents the application of a sensorless direct torque control (DTC) for an induction motor, using an improved H-Bridge multilevel inverter with 27-Levels. The inverter topology reduces the power sources from nine to only four active sources and three ultracapacitors. The power sources are unidirectional and non-redundant; scaled in power of three to optimize the number of voltage levels...
Three-level neutral-point-clamped (NPC) inverters are very appropriate for high-power adjustable-speed drive applications. Direct torque control is characterized by the merits of fast response, simple structure and strong robustness to motor parameters variations. This paper presents a 3-level inverter-fed direct torque controlled (DTC) induction motor (IM) drive based on optimized switching table...
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