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Toothed coupling machines and multi-air gap machines are interesting solutions for direct drive because of the high specific performances they can achieve.
The design of a linear electric machine with high-frequency alternative motion intended for the creation of the acoustic wave of a system of thermo-acoustic conversion.
The goal of this paper is to analyze and evaluate the eddy-current losses due to stator slotting in conductive and non-conductive retaining sleeves mounted on the rotor of a high-speed SMPMSM: 60kW, 10kRPM, designed for an aeronautical application. Roughly speaking, there are two groups of sleeves: composite sleeves (carbon-fiber or fiberglass+resin) and metallic sleeves (Inconel718, titanium, stainless...
This paper presents a comparative study of rotor eddy-current losses, due to stator slotting, in two types of sleeves (composite: carbon-fibre and metallic: Inconel718) mounted on the rotor of high-speed permanent magnet synchronous machine (60 kW, 10000 RPM), dedicated to an aeronautical application. Roughly speaking, there are two groups of sleeves used to increase the mechanical strength of magnets:...
This paper describes a part of a larger supervision system able to monitor the on-state voltage VCE and the junction temperature TJ of IGBT in operation. That system is associated to an ageing test bench stressing IGBT modules by power cycling. All along the ageing test, it is necessary to supervise VCE, always measured in the same conditions of junction temperature and collector current, in order...
These article deals with a special high performances, large extension, direct drive linear actuator for an aeronautical application. The purpose of this actuator is to remove the mechanical transmission, classically used, in order to increase the reliability. This actuator can reach very high performances in terms of mass and volume because of the multiplication of the number of airgaps. A particularity...
The increase of the performances of wind turbine systems passes through the removal of the speed-increasing gear which is generally located between the blades and the alternator and thus the direct drive of this last. In this article we will show that the association of a direct-driven synchronous motor with Vernier effect and a diode rectifier is possible and makes it possible to achieve interesting...
Electric actuators are replacing hydraulic actuators in the new aircrafts. A direct drive multi-airgap linear actuator has been designed and developed in order to replace a hydraulic actuator for a landing gear system application. The advantage of using a direct drive solution is to remove the mechanical transmission and consequently to increase the reliability. The experimental results show the high...
This paper presents a high torque mass ratio electromagnetic actuator which works with two differents coupling of the air gap magnetic field. The first one is a polar coupling as for the conventional synchronous machines and the secondth is tooth coupling as for the Vernier machines.
This paper presents an experimental chopper-inverter system which we use for most of our lab work in power electronics. The system is based on an IGBT three-phase voltage inverter and a FPGA control board. According to the configuration chosen by the user, this set can constitute a converter in a predefined list ranging from the simple non reversible buck converter up to the three-phase PWM power...
This paper presents interactive "apparent real time" simulation applications for the teaching of powers electronics. We present a study of of the following converters: buck converter, one, two and four quadrant chopper, boost converter, single-phase inverter, flyback converter, rectifier on capacitive load,... The following simulations VI (LabVIEW virtual instrument) could be useful for...
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