Analyse et conception de moteurs synchrones chemisés à commutation électronique

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Reducing emissions and energy consumption of the building stock is a crucial element of Switzerland’s energy transition. A better understanding of the energy fluxes and heat emissions from buildings is therefore essential. This report draws on a bottom-up approach to urban building energy models (UBEMs) to define building archetypes relevant to the Swiss Lemanic context. Based on diverse spatial data sources and a methodical data processing workflow, a detailed set of input parameters for the STEBBS model i

In a large share of industrial process, heat demand is required as steam. One possibility for steam generation is to evaporate water against condensing refrigerant in a heat pump and compress it with a separate compressor to the desired final pressure. This work aims to demonstrate this process with a 70-kW butane (R600) heat pump and a small- scale centrifugal compressor for steam recompression. The high-temperature heat pump was built with a 6-cylinder reciprocating compressor, flat plate heat exchangers

One of the major advantages of soft grippers – the fact that they are soft - is also sometimes one of their limitations. While highly compliant materials allow these grippers to conform around and grasp objects, it also limits the amount of force that these actuators can support. Here, we present a compact, prehensile and soft gripper capable of varying its stiffness on demand, allowing not only grasping but also manipulation of objects. The gripper consists of fluidic chambers within a silicone structure a

The penetration of intermittent energies in the energy system engenders grid power peak issues for the operators. The cost to reinforce the grid increases the electricity prices leading to a situation where consumers pay for the prosumers' grid usage. This socioeconomic problem drives the research towards new and fair tariff structures that impose fees in proportion to the power exported to the grid. This project aims to model and optimise the electrical and thermal loads of a set of buildings in the city o

In a previous project [7], a heuristic control algorithm has been developed to find optimal management of the system including : Photovoltaic panels + Inverter + Grid Connection + House Loads + Heat Pump + Domestic Hot Water Tank + Domestic Hot Water demand on a household scale. The aim was to increase the photovoltaic selfconsumption while minimizing the operating expenditures. During this master thesis the optimal control algorithm has been completed and enhanced. Firstly, it has been extended to house he

Akribis Systems is a young company specialising in the design and manufacture of motors, stages, and precision systems used in many various environments. Akribis’ products range from standard linear and voice coil motors to fully customized stages, through rotary motors. To be able to further improve the quality of the products provided to its customers, Akribis is interested in studying the behaviour and the physical limits of various elements included in the design of Gantry stages.

This paper deals with a DC-segmentation of interconnected power systems which represents a relatively new and interesting approach that could be a potential solution for mitigation of the cascading outages effects. The DC-segmentation is defined as the use of DC links to split large AC grids into sets of smaller asynchronously operated AC segments. By implementing grid segmentation, it should be plausible to improve the controllability of power flows, to limit the propagation of disturbances, to reduce the

BACKGROUND: In the field of neuroscience microarray gene expression profiles on anatomically defined brain structures are being used increasingly to study both normal brain functions as well as pathological states. Fluorescent tracing techniques in brain tissue that identifies distinct neuronal populations can in combination with global gene expression profiling potentially increase the resolution and specificity of such studies to shed new light on neuronal functions at the cellular level. METHODOLOGY/PRIN

The devlopment of domestic heat pump systems is mainly based on the use of volumetric oil lubricated compressors. Following the implementation of economizer based rotary compressors, which represented a major improvement step, one major opportunity to improve both efficiency and heat rate, in particular for high temperature lift heat pumps, is to use two stage cycles. However the reliability of those can be strongly impaired by oil migration, resulting in oil level unbalance when using oil lubricated compre

This paper describes a linear motor optimization based on an analytical model. The studied motor, also called "ironless", consists of an iron core U shape with permanent magnets on each side, between which the coils can move. The glider which supports the coils is made of a non-ferromagnetic composite material, like epoxy. For this reason this type of motor has a small force density, but on the other hand this motor has a small moving mass, which allows high accelerations. The goal is to show that various o

The goal of this semester project is to create a thermal model of a electronic circuit board that will be used to control a Brushless DC motor for the project “Solar Impulse”. For this project, the finite element (FEM) software Ansys is used to build the model and to then apply the thermal loads. The software will calculate the temperature of the circuit board. The modeling using FEM is applied as it is not possible to make an analytical model for a complicated configuration like in this case.

It is possible to determine the types and values of stator and rotor errors in magnetic circuits in a synchronous machine by measuring the induced voltage (ui) for the terminals of measurement loops (2) which can capture an image of the induction in the measurement gap, then by treating said signals.

The article presents a fully automated identification method for the determination of the sub-subtransient, subtransient and transient characteristic parameters of large synchronous machines. The software allows for an identification of the parameters based on the measurements of the terminal currents during a three-phase short-circuit as defined in the international standards. Based on the identified parameters the equivalent circuit diagram (ecd) is established and it can be used as model of the synchrono

The choice of the drive composition is an obligatory stage in designing a product including electric drives. The large variety of the elements composing the electric drive (electronics, driving and kinematic chain) leads to a quasi-unlimited number of possible alternatives. Models and programs make it possible for the engineer to calculate independently the elements of a given composition, but the choice of the composition often remains subjective. We make the assumption that it is possible to automate the

Developing a research autonomous plane for flying in a laboratory space is a challenge that forces one to understand the specific aerodynamic, power and construction constraints. In order to obtain a very slow flight while maintaining a high maneuverability, ultra-light structures and adequate components are required. In this paper we analyze the wing, propeller and motor characteristics and propose a methodology to optimize the motor/gear/propeller system. The C4 model plane (50g, 1.5m/s) demonstrates the

Pyrochlore free Pb(Mg1/3Nb2/3)O-3 (PMN) thin films were prepared from alkoxide-based solution precursors. The influence of different seeding layers and chemical solution on the microstructures is shown. Dielectric, electrostrictive, and piezoelectric properties of the films were characterized in detail. Films show relaxor-like behavior, but with dielectric permittivity which is low (around 4000 at peak) compared to bulk ceramics and single crystals. Several parameters which might be responsible for this low

The brushless DC motors are normally built with rotor mounted PMs, which create the necessary back EMF voltage to produce a mechanical power. The shape of this back-EMF voltage is very important compared to the phase voltage supply one. Indeed, the electromechanical power is obtained by the product of the back-EMF and the phase current. Two possibilities are normally used to make the choice of the electronic supply. If the back-EMF is trapezoidal, the supply will be "block" (120 degrees, two-phase one mode)

The present paper presents an automatic approach for the determination of the parameters of laminated salient-pole synchronous machines, based on 2D finite element method (FEM). Calculations using FEM are performed in rotation (sudden three-phase short-circuit) and at standstill, for different positions of the rotor and for different frequencies. A comparison between results obtained by both methods is presented. of different algorithms. A further step would be to take into account saturation effects, and t

The capacities of performance improvements of low and mid-size heat pumps are studied in this project. For the new buildings market, the components of the heat pump match already well the requirements for high performance and monovalent heating. Minor improvements are to be expected on inverter driven compressors and on the integration of the domestic water in the heat pump cycle. This study is focused on the retrofit market (replacement of existing oil burners). For this case the existing air-water heat pu

Several years ago it has been demonstrated experimentally and verified theoretically that Vuilleumier heat pump systems (a combination of a Stirling engine with a Stirling heat pump) can be supercharged periodically by means of an attached resonance tube, thus enhancing the pressure variation and the power density of such units. These investigations have been continued in the present study, where it has been shown that the supercharging stabilises the movement of the free pistons. High performance rates can

Analyse et conception de moteurs synchrones chemisés à commutation électronique

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Building archetypes definition and parameters derivation for modelling building energy fluxes in Canton of Vaud and Geneva

Experimental results from a 70 kW steam-generating butane heat pump using off-the-shelf components

A variable stiffness soft gripper with integrated ion-drag pump

Impact of regulations on the optimal design, operation and costs of a PV installation with energy storage and heating system

Heuristic optimal control of a heat pump to increase the self-consumption of photovoltaic electricity

Study and optimisation of a linear drive system

Assessment of HVDC grid segmentation for reducing the risk of cascading outages and blackouts

Gene expression profiling of two distinct neuronal populations in the rodent spinal cord

Theoretical Design of a High Speed, Oil Free Radial Compressor for Domestic Heat Pumps

Linear motor optimization using an analytical model

Solar Impulse – Thermal simulation of the electronic circuit board

Method and device for treating signals for detection of stator and rotor errors in magnetic circuits in a synchronous machine

Fully automated parameter identification for synchronous machines

Contribution à l'optimisation des entraînements électriques

Toward Indoor Flying Robots

Electromechanical properties and self-polarization in relaxor Pb(Mg1/3Nb2/3)O-3 thin films

Modification of brushless DC motor back-EMF shape-application to noise reduction

Automatic determination of laminated salient-pole synchronous machines parameters based on the finite element method.

Pompe à chaleur biétagée à haute performance. Phase 2: Dégivrage par énergie à basse exergie

Stirling–Wärmetransformator für die Beheizung von kleinen und mittleren Wohnbauten.