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As we have seen, it still difficult to include EMC in the classical reliablity process. This explains why, that until now, the two domains where not really linked. But it's a necessity to merge the two tasks, because in both cases, the customer impact and its gravity are the common inputs in the risk level computation.
♦ Testing alone is not able to establish EM reliability ♦ an established and essential tool, but not sufficient ♦ tests need to be better understood and used ♦ Modelling and simulation ♦ benefits in design, specification, better targeted testing ♦ in use, but major technical and operational challenges ♦ like testing, too many states for comprehensive evaluation ♦ EMC is a functional safety issue ♦...
This paper deals with reliability of motor drive systems. It focuses on the switching power converter which is the weakest drive part. It investigates a new architecture which provides intrinsic redundancy. The method used in this fault switch detection and diagnosis is based on a sliding mode observer. The original aspect of this new approach is that the observer influences the control algorithm...
This paper studies a torque estimation model for induction machines. The model requires different machine parameters as input. Since the input parameters are deduced from measurements burdened with inaccuracy, it is necessary to take into account uncertainty in the input of the model. On that account the distribution and the interdependence of the input parameters is determined. A sufficient data...
This paper deals with fault tolerant multiphase electrical drives. The quality of the torque of vector-controlled Permanent Magnet (PM) Synchronous Machine supplied by a multi-leg Voltage Source Inverter (VSI) is examined in normal operation and when one or two phases are open-circuited. It is then deduced that a seven-phase machine is a good compromise allowing high torque-to-volume density and easy...
Electromagnetic systems depend upon the integrity of electrical connections. An intermittent speed sensor connection is shown to generate a false speed signal that may allow an automobile speed control system to engage at low speed and cause a sudden acceleration. Preventive measures are discussed. The current approach to controlling uncommanded sudden accelerations seems to rely upon the driver braking...
The aim of this paper is to present a fault detection and isolation procedure on a three phase inverter feeding an induction machine drive. The main goal of this classification is to help the supervising team for the monitoring and also for the maintenance. The monitoring increases the reliability of the drive and the accurate isolation reduces the time to repair and therefore reduces the maintenance...
The goal of this paper is to design a high performance speed controller for a PMSM drive. The controller is passivity based using the energy shaping technique namely Interconnection and Damping Assignment. Under some assumptions, a linear controller is derived associated to a non linear observer to estimate the load torque which is unknown. The important point developed in this paper is the proof...
A study on the characterization of small cracks by using eddy current testing (ECT) signal is presented. The significant parameters of the ECT data are selected using principal component analysis according to two approaches. The ECT signal inversion is then achieved using a parametric model trained with synthetic data obtained with a fast numerical simulation tool. The characterization procedure is...
The paper presents methodology of designing the converter for energy transfer from small wind power plant to common grid. The design considers the opposed requirements of minimum power loss, maximum operation reliability and minimum capital cost of the system. The solution consists in suitable aggregating the separate requirements in one generalised optimisation criterion as well as in using twoexponential...
This paper deals with the fault tolerant control of a four-legged inverter/rectifier included in a full-stand alone generator dedicated to aircraft power supply. The controller proposed here is based on a predictive strategy allowing to keep an invariable architecture supervised by a fault detection subsystem. Finally, it is validated by simulations.
To insure interoperability of the transeuropean trains, new transmission systems (GSMR, Eurobalise) are developed in order to permit communications between trains and control centres. These systems have to be available and safe from an electromagnetic point of view, but the normalized methods to characterize electromagnetic noise in railway environment are not convenient for these applications. This...
To simulate electric transmission lines with skin effect, an existing reduced order differential model of skin effect is numerically optimized. This model corresponds to a simple equivalent electric circuit in the form of a ladder, consisting of frequency independent electric elements. The accuracy of the model is improved by optimization of model parameters with an algorithm for system identification...
This paper describes a control system that has been designed to handle sensor faults and therefore could be considered as fault-tolerant control one. The fault tolerant controller is based on the output of the speed sensor and two speed observers. The first one is a suboptimal Kalman filter based on the state model of the machine. The second one is based on the estimation of the frequency of one “rotor...
The paper presents the possibilities to evaluate the health of an electrical machine by analyzing its electromagnetic emissions. Different piece of information can be detected according to the frequency range. First of all, a monitoring system sensitive to the degradation of the turn-to-turn insulation quality of the stator winding is presented; it is based on High Frequency emissions. The second...
The numerous qualities of squirrel cage Induction Machines (IM) enchance their use in industry. HOwever, various faults can occur, such as stator short-circuits and rotor failures. In the present paper, the effects of the rotor failures, such as broken rotor bars, are studied experimentally in function of the type of induction mtoor feeding and the load. The diagnosis technique, which is used, is...
The present work deals with the use of 3D analytical transformations in order to establish geometry and vector transformations models for eddy current problems in 3D nondestructive testing systems. The interest of such a transformation is the generation of electromagnetic field for cylindrical problem from only the field distribution known in simpler 3D (x-y-z) geometry. The transformation technique...
In order to avoid a complete degradation of an Induction Motor (IM) and to direct the maintenance task, the detection and location of an early fault is of great concern.
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