Jean-Pierre Masson

Synthesis and Coordination of the New Chiral Tridentate O,N,O Ligand 2,6-Bis[(1S,2S,5R)-(−)-menthyl]pyridine to Molybdenum(VI) and Vanadium(V) Oxo Complexes: Crystal Structures of [(2,6-Bis{(−)-menthyl}pyridine)MoO2] and [(2,6-Bis{(−)-menthyl}pyridine)VO]2(μ-O)

The novel tridentate chiral ligand 2,6-bis{(−)-menthyl}pyridine (1), was readily prepared from the reaction of 2,6-dilithiopyridine with (−)-menthone. Reaction of 1 with VO(OiPr)3 and [MoO2(acac)2] resulted in the formation of the new metal-oxo complexes [VO(ONO)]2(μ-O) (2) and [MoO2(ONO)] (3) [ONO = (1− 2 H)]. Both metal-oxo compounds 2 and 3 have demonstrated the ability to catalyze the asymmetric oxidation of prochiral olefins with tBuOOH as the oxidant. The compounds 1−3 have been fully characterized by 1H, 13C and 51V (where appropriate) NMR spectroscopy, mass spectrometry, microanalysis and IR spectroscopy. Furthermore, the molecular structures of 2 and 3 have been determined by single-crystal X-ray diffraction.

The magnetic field diffusion equation including dynamic hysteresis: a linear formulation of the problem

The introduction of accurate material modeling such as hysteresis phenomenon in numerical field calculation leads to numerical problems induced by the nonlinear properties of the initial system. We focus on the solution of the magnetic field diffusion equation, which contains such problems. This paper presents a new formulation of the diffusion equation including dynamic hysteresis. The resulting formulation leads to a linear system to solve. A numerical implementation of the problem and an experimental validation are also presented.

Introducing dynamic behavior of magnetic materials into a model of a switched reluctance motor drive

Dynamic hysteretic effects of magnetic materials are usually neglected in actuators modeling. In order to take into account these effects, we coupled a two-dimensional finite-element (FE) model in an original way with a magnetic equivalent circuit by using dynamic hysteretic flux tubes (DHFT). As an example of an application, we present the model of an ultrafast switched reluctance motor, in which the control of the power converter is of major importance, and where iron losses can reach critical values.

Modeling of a non-linear conductive magnetic circuit. 1. Definition and experimental validation of an equivalent problem

Dynamic representation model of a magnetic circuit including effects of hysteresis and transients is described. This dynamic modelling is worthwhile regarding time spent on different calculations and it requires only two parameters for the entire simulation. An experimental validation is presented on industrial cases.