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The operation of multiphase machines in open-phase fault conditions is always associated with undesirable ripples in torque and power, even in steady state conditions. In the literature, several methods have been proposed to reduce these oscillations considering a fixed-fault situation without taking into account the transient behavior during the modification. In this way, this paper deals with the...
The aim of this work is to propose an efficient vector control for power losses optimisation of a squirrel cage six-phase induction generator (SC6PIG). This method, suitable for variable speed wind energy conversion system (WECS), allows the increase of the generator efficiency whatever the power operating points. This efficient control method is based on Field Oriented Control (FOC) associated to...
This paper presents a Finite Element Analysis (FEA) of a 24kW six-phase Axial Flux Permanent Magnet Synchronous Machine (6AFPMSM) and its validation through experimental tests for fault tolerant generation purposes. The presented topology contains a high pole number and is suited for wind turbines applications in direct-drive or hybrid one-step geared systems. Simulations with Finite Element Method...
The use of multiphase machines can increase the reliability of the system since there are still three healthy phases even in faulted mode. Nevertheless, the controllers have to be updated when a fault occurs. In this way, a general control scheme is proposed in such a way to remove the electromagnetic power oscillations for a six-phase induction generator (6PIG) in healthy and up to three opened-phases...
Energy production or critical applications need fault tolerant operation. Six-phase induction machine (SC6PIG) increases the reliability by allowing the loss of up to 3 phases. Associated with a relevant novel control able to adapt itself to the new configuration, operation can keep on under fault. A novel strategy of control is here proposed with sensorless control. This strategy nonetheless focus...
This paper deals with speed control of a squirrel cage six-phase induction machine (SC6PIM) in phase opening occurrences. A decoupled model of induction machine with unbalanced structure is given to analyze the phase opening operation of the SC6PIM. In order to reduce torque oscillations created in phase opening events, a fault-tolerant operation method by using indirect rotor field oriented control...
This study presents field oriented control of a squirrel cage six-phase induction generator (SC6PIG) when a phase fault is detected in order to minimize output power oscillations during phase opening. An unbalanced structure of squirrel cage six-phase induction machine (SC6PIM) has been modeled to analyze healthy and faulty conditions of the machine. According to the unbalanced structure of the machine,...
This paper presents a new approach to the sensorless speed control of six-phase induction machine (6PIM). The new technique uses an Adaptive Neural Fuzzy Inference Systems (ANFIS) as a rotor speed estimator to avoid using mechanical sensor. This makes the reference model free of pure integration and less sensitive to stator resistance variations. The ANFIS has been trained offline to estimate the...
In this paper, a fuzzy PI (FPI) controller tuned using genetic algorithms (GA) is proposed for position control of six-phase induction motor (6PIM). The performance and the robustness of the control system are tested for healthy and several faulted operational modes and rotor inertia variations. The FPI controller presents many advantages such as satisfactory control performance under a wide range...
This paper deals with a new transformation and fusion of digital input patterns used to train and test feed-forward neural network for a wound rotor three-phase induction machine winding short-circuits classification. Used input/output data have been binary coded in order to reduce the computation complexity. A new procedure, namely addition and mean of the set of same rank, has been handled to fuse...
This paper presents a new approach to the sensorless position control of six-phase induction machine (6PIM). A fuzzy-PI (FPI) system has been employed to estimate the rotor position and avoid using mechanical sensor. Also, high-accuracy positioning of a 6PIM rotor can be obtained using such FPI system in model control loops. The input-output scale factors of all FPI systems are tuned using genetic...
In this paper, a fuzzy PI (FPI) controller is proposed for position control of six-phase induction motor (6PIM). The fuzzy controller is tuned by using the genetic algorithm so that a high performance of the overall system's response can be achieved. The performance and the robustness of the control system are tested for fully loaded and widely load inertia variations. The proposed scheme is compared...
In this paper, a new fault tolerant direct torque control (DTC) algorithm for six phase induction machines (6PIM) is introduced. The machine presents two sets of three phase windings spatially shifted by 60 electrical degrees. The aim of the proposed approach consists in computing an average stator voltage vector in order to control the mean values of the stator flux and the electromagnetic torque...
The aim of this paper is to analyze theoretically and experimentally the stator current of a three phase induction machine and load torque signals in a hoisting winch system, in order to show how they are influenced by the wire rope faulty condition. When the wire rope is subjected to axial and torsional loads, the outer strands can separate from the core in permanent way and make the rope useless...
The aim of this paper is to develop a doubly-fed induction machine (DFIM) model suitable for the simulation of this machine in the healthy mode and faulty mode. Indeed, the developed model allows the simulation of the inter-turn short circuit in the stator or the rotor of the machine in any system with control circuits and/or connections to the grid by means of power electronics converters. The circuit-oriented...
In this paper, sliding mode control (SMC) is applied to regulate the dq axis currents of a 6 phase induction machine (6PIM). This strategy presents a good alternative in power electronics for electrical drives because of its dynamic properties and its high robustness. The design of the sliding mode control law, defined from the healthy mode model, is based on the linear feedback with switched gains...
In this paper, a new direct torque control (DTC) algorithm for six phase induction machines (6PIM) will be introduced. The machine has two sets of three phase windings spatially shifted by 60 electrical degrees. This approach is based on deriving the voltage vectors in a synchronous frame rotating with the stator flux. It leads to a fixed switching frequency and low torque ripples. Simulation and...
The main goal of increasing the number of phases in an induction machine is to ensure its performance in all the operating modes such as normal, disturbed and faulted settings. The faulted mode of a Six Phase Induction Motor (SPIM) denotes that the SPIM is working with one or more missing phases. This situation leads to high torque ripples and bad tracking behaviour. A suitable robust control law...
This paper presents the design and application of the fuzzy logic and the sliding mode controls associated with field oriented control in order to obtain a high precision positioning of a six phases induction machine (6PIM). The two techniques are first presented. Then, to validate experimentally the efficiency of the two methods, an advanced test bed is used.
The aim of this paper is to analyze experimentally the stray flux spectrum of a three phase induction machine in an electromechanical system, in order to show how it is influenced by the gearbox behavior. The mechanical monitoring in the electromechanical systems has been mainly studied using vibration signals. Recently, some works have been performed in order to monitor the mechanical part by using...
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