Identification of sensitive R-L parameters of a Multi-phase drive by a vector control

This paper focuses on an experimental method to determine the electric parameters of a seven-phase low-voltage multiphase drive. The drive is a belt driven starter-alternator for powerful cars with Hybrid Electrical Vehicles (HEV) functions. The resistive and inductive parameters are necessary to obtain the six characteristic time constants of the control modeling. Classical direct measurements lead to imprecise results because of very low values for the windings electric resistance (a few mΩ) and inductance (a few μH). Effects of the imprecision on the measurements are all the more important that time constants are obtained by a ratio of cyclic inductances by resistance, with cyclic inductances being a linear combination of seven measured inductances. The methodology for identification detailed in this paper is based on a stator current vector control, in a multi-reference frame. This methodology allows us to get directly these time constants. Numerous measurements allow the robustness of the method to be evaluatedThis work was supported by the French car supplier Valeoand the regional council of France Region-Nord-Pas-De-Calais

Comparison Between NEM and FEM in 2D Magnetostatics Using an Error Estimator

International audienceThis communication deals with a comparison between two methods of discretization: the well known finite element method and the natural element method that is a meshless method. An error estimator, based on the non-verification of the constitutive law, is used. This estimation has been applied to two examples: a device with permanent magnets and a variable reluctance machine

Modeling and Control of a 7-phase Claw-pole Starter-alternator for a Micro-hybrid Automotive Applications

International audienceThis paper deals with the modeling and the control of a new high power 12V Integrated Starter Alternator (ISA). This system is used to bring micro-hybrid functions to standard Internal Combustion Engine (ICE) vehicles. The drive is composed of a seven-phase synchronous claw-pole machine with separate excitation, supplied with a seven-leg Voltage Source Inverter (VSI) designed for low voltage and high current. The system is modeled in a generalized Concordia frame and a graphical description is used to highlight energetic properties of such a complex system. A control scheme is then deduced from this graphical description. Two controls are achieved in generator mode and compared: one is using the VSI in a square-wave mode, the other in a Pulse Width Modulation (PWM) mode. Experimental results are provided

Effet de la saturation magnétique sur la performance de la commande sensorless d'une MSAP à l'arrêt et en basse vitesse dans un contexte automobile

International audienc

Effet de la saturation magnétique sur la performance de la commande sensorless d'une MSAP à l'arrêt et en basse vitesse dans un contexte automobile

International audienc

Effet de la saturation magnétique sur la performance de la commande sensorless d'une MSAP à l'arret et en basse vitesse dans un contexte automobile

International audienceCe travail s’intéresse aux techniques d’estimationsans capteur mécanique (Sensorless) de la position et la vitessed’une Machine Synchrone à Aimants Permanents Internes(MSAPI) destinée à des applications de type véhicule électrique.Les techniques d’injection d’un signal haute fréquence en bassevitesse et à l’arrêt ont été développées. Ces techniques s’appuientsur l’anisotropie du circuit magnétique. En effet, la faisabilité et lesperformances de l’estimation dépendent fortement de la saillancede la machine, notamment dans les régions de fonctionnementsaturées. Ainsi, l’objectif de ce travail est d’abord d’explorerl’impact de la saturation magnétique sur la saillance de la machineet puis d’identifier, en conséquence, les zones de validité del’algorithme sensorless tout en prenant compte la stratégie decontrôle de courant adoptée

Combined in silico and in vitro approaches to identify P‐glycoprotein‐inhibiting pesticides

International audienceThe P-glycoprotein (P-gp) efflux pump plays a major role in xenobiotic detoxification. The inhibition of its activity by environmental contaminants remains however rather little characterised. The present study was designed to develop a combination of different approaches to identify P-gp inhibitors among a large number of pesticides using in silico and in vitro models. First, the prediction performance of four web tools was evaluated alone or in combination using a set of recently marketed drugs

Identification of a 7-phase claw-pole starter-alternator for a micro-hybrid automotive application

International audienceThis paper deals with the identification of a new high power starter-alternator system, using both: a Finite Element Method (FEM) modeling and an experimental vector control. The drive is composed of a synchronous 7-phase claw-pole machine supplied with a low voltage / high current Voltage Source Inverter (VSI). This structure needs specific approaches to plan its electrical and mechanical behaviors and to identify the parameters needed for control purpose. At first, a Finite Element Method (FEM) modeling of the machine is presented. It is used for the predetermination of the electromotive forces and of the torque. Experimental results are in good accordance with numerical results. In a second part, resistive and inductive parameters of the drive are determined by an original experimental approach that takes into account each component of the drive: the battery, the VSI and the machine