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The aim of this paper is to present the structure of a new flux switching synchronous machine with hybrid excitation. This machine uses the flux switching principle where all the active parts are located on the stator. The rotor is only a salient passive rotor and can be robust and made with a low cost technology. This new machine can be supplied with electricity by means of a traditional three phase voltage converter or can be associated with a diode rectifier. The hybrid excitation is an association of permanent magnets and a wound exciter.

This paper presents a general and accurate approach to determine the no-load flux of field-excited flux-switching (FE-FS) machines. These structures are inherently difficult to model due to their doubly-slotted air-gap. This analytical approach is based on MMF-permeance theory. The analytical model developed is extensively compared to field distribution obtained with 2D Finite Element (2D FE) Simulations. The good agreement observed between analytical model and 2D FE results emphasizes the interest of this general approach regarding the computation time. Hence, this analytical approach is suitable for optimization process in presizing loop. Furthermore, based on the field model, classical electromagnetic performances can be derived, such as flux-linkage and back-electromotive force (back-EMF) and also, unbalanced magnetic force. Once again, FE results validate the analytical prediction, allowing investigations on several stator-rotor combinations, or optimization of the back-EMF.Index Terms-Analytical model, magnetic field, switched flux, flux-switching, slotting effect, air-gap permeance, modified magnetomotive force.Hoang Emmanuel was born in Antibes, France, in 1966. He received the "agrégation" in electrical engineering in 1990 and the Ph.D. degree from the Ecole Normale Supérieure de Cachan in 1995. Since 1990, he has worked with the electrical machine team in the SATIE laboratory. His research interests include the modeling of the iron losses in SRMs and the design, modeling, optimization, and control of novel topologies of PM machines. De la Barrière Olivier

SUMMARYThis paper presents a design procedure of a flux-switch synchronous machine for an aircraft oil breather application. This work is part of a European project called 'Power Optimised Aircraft'. The aim of this project is to replace some mechanical equipment by electromechanical devices to improve performance and reduce power consumption. The structure under study was developed at SATIE laboratory and it is based on the flux-switch principle. The permanent magnets are located in the stator, and the rotor is entirely passive. The study described in this paper is limited to the electromagnetic design.

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This paper presents a new topology of Hybrid Excited Flux-Switching Machine (HE FSM) with excitation coils located in stator slots (or inner DC windings). After describing the three phase structure to be investigated, the working principle is discussed and main electromagnetic performances are simulated by Finite Element (FE) Analysis. It is demonstrated that the airgap field can be easily controlled which is interesting for variablespeed applications. Finally, a prototype having 12 stator poles and different rotor teeth number (10 or 14) was built. Experiments were performed validating FE simulations and the operation principle. Finally, the thermal behavior of the prototype machine is investigated through experiments. It is shown that up to 12000rpm, the thermal stabilization is achieved, making this topology an excellent candidate for high-speed applications.Index Terms-Brushless machine, finite element analysis, hybrid excited, flux-switching.

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This paper presents a description and operating principle of different hybrid excitation synchronous machines. Four prototype machines of different power rating (3 kW and 15 kW) have been studied. These machines combine two flux sources: permanent magnets, located in the rotor, and field coils, located in the stator. Thanks to this particular configuration the air gap flux can be easily controlled, without any risk of magnets demagnetisation. Tests are performed on the prototype machines to asses their flux weakening capability. Three of prototype machines are modular and can be assembled to have a homopolar or a bipolar configuration. These two configurations are compared using experimental measurements. The advantages and drawbacks of each configuration are described.