Publications by Douglas Martins Araujo

Novel Generalised Notch Filter for Harmonic Vibration Suppression in Magnetic Bearing Systems

Yves Perriard, Leopoldo Rossini, Guzmán Borque Gallego, Douglas Martins Araujo

Magnetic bearings represent an important alternative to conventional ball bearings for applications that require very low noise and vibrations. The absence of contact and friction between rotor and stator parts, combined with the use of active vibration co ...

2021

Efficiency Optimisation of Slotless Magnetic Bearing Machines

Yves Perriard, Leopoldo Rossini, Guzmán Borque Gallego, Douglas Martins Araujo

Efficiency is one of the key performance indexes in the design of electric motors. When considering fully active magnetic bearing machines, this aspect gain further relevance due to the necessity of actively controlling all the remaining degrees of freedom ...

2021

Magnetic and Mechanical 3-D Modelling of a 15 T Large Aperture Dipole Magnet

Pierluigi Bruzzone, Douglas Martins Araujo, Luca Bottura

In 2018, two structures have been proposed with the goal of replacing the magnetEDIPOthat stopped operating in 2016. These two solutions were designed to generate a field of 15 T on an aperture of 100 x 150 mm2 at 4.2 K by using Nb 3Sn superconducting Ruth ...

IEEE Institute of Electrical and Electronics Engineers2020

Design of Compact Bearingless Disc Drive Systems

Yves Perriard, Douglas Martins Araujo, Juan Patricio Tomás Peralta Fierro

Inflating costs and emerging applications are spawning interests toward smaller and faster electric drives. The challenges of miniaturization make magnetic bearings more appealing, as they provide intrinsic high-speed capability and need virtually zero-mai ...

2020

Novel Optimized Shape and Topology for Slotless Windings in BLDC Machines

Yves Perriard, Adrien Jean-Michel Thabuis, Guillaume Paul-André Burnand, Douglas Martins Araujo

Slotless windings are commonly used in small size high-speed electrical brushless dc machines. Unlike slotted windings, forced to follow the direction of slots, slotless windings can be freely arranged in the airgap. This represents several opportunities f ...

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC2020

On-line micro-vibration measurement method for Lorentz-type magnetic-bearing space actuators

Yves Perriard, Leopoldo Rossini, Guzmán Borque Gallego, Douglas Martins Araujo

A novel, cost-effective, real-time and on-line method for measuring the generated micro-vibrations and iden- tifying the forces in a magnetic bearing space actuator is proposed. For its validation, an actively-controlled electrodynamic (Lorentz-type) magne ...

2019

Current Control Strategy for Dynamic Winding Reconfiguration of Slotless Brushless DC Motors

Yves Perriard, Florian Louis Copt, Douglas Martins Araujo

Depending on the winding configuration, the intrinsic characteristic of a motor differs. By reconfiguring the winding, it becomes possible to increase the torque–speed limitation of a motor. Current proposed methodologies for dynamically reconfiguring the ...

2019

Magnetic Bearing Reaction Wheel Micro-vibration Signature Prediction

Yves Perriard, Leopoldo Rossini, Guzmán Borque Gallego, Douglas Martins Araujo

This article presents an analytical micro-vibration model for magnetic bearing reaction wheels (MBRWs) based on a rotordynamics model combined with the active control loop. This model is validated employing a fullyactive Lorentz-type MBRW demonstrator and ...

2019

Magnetic and Mechanical Design of a 15 T Large Aperture Dipole Magnet for Cable Testing

Pierluigi Bruzzone, Douglas Martins Araujo, Luca Bottura

2019

Micro-vibration identification in active magnetic bearing systems

Yves Perriard, Leopoldo Rossini, Douglas Martins Araujo

2019

General Sensorless Method with Parameter Identification and Double Kalman Filter Applied to a Bistable Fast Linear Switched Reluctance Actuator for Textile Machine

Yves Perriard, Douglas Martins Araujo, Faguy Tamwo Simo

This paper provides a general sensorless method to control the position of a linear actuator. After a review of the solutions used so far, this new method is applied to identify keys passing through a linear actuator used in an industrial textile machine. ...

INST ELECTRICAL ENGINEERS JAPAN2019

Force and Torque Model of Ironless Passive Magnetic Bearing Structures

Yves Perriard, Leopoldo Rossini, Guzmán Borque Gallego, Douglas Martins Araujo

This article presents the development and validation of a three-dimensional force and torque semi-analytical model for ironless permanent magnet structures. This method relies on the definition of the magnetic flux density generated by permanent magnets in ...

IEEE2019

Passive, Active and Loss Tradeoffs in High-Speed Bearingless Motors

Yves Perriard, Douglas Martins Araujo

Material costs and novel applications have directed research interests towards miniaturized, faster rotatory electric drives. The challenges of miniaturization have made magnetic bearings more attractive, which are naturally suited for high speeds and virt ...

2018

Force Analysis of a Slotless Lorentz-Type Active Magnetic Bearing Actuator

Yves Perriard, Leopoldo Rossini, Guzmán Borque Gallego, Douglas Martins Araujo

This article presents the analysis of the three-dimensional forces applied by a slotless Lorentz-type fully-active magnetic bearing actuator. An analytical model is presented for defining the forces applied by every radial and axial bearing of the actuator ...

2018

Optimization of shape and topology for slotless windings in BLDC machines

Yves Perriard, Guillaume Paul-André Burnand, Douglas Martins Araujo

Slotless windings are commonly used in small size high-speed electrical brushless DC machines. Unlike slotted windings, forced to follow slots direction, slotless windings can be freely arranged in the airgap. This represents several opportunities for opti ...

2018

Speed and Stability Limits for High-Speed Bearingless Disc Drives

Yves Perriard, Douglas Martins Araujo, Juan Patricio Tomás Peralta Fierro

Increasing material costs and emerging applications have steered research trends towards compacter and therefore faster drives. The arising challenges of miniaturization have made contactless magnetic levitation increasingly attractive, which offer practic ...

IEEE2018

Electrical machines winding

Yves Perriard, Guillaume Paul-André Burnand, Douglas Martins Araujo

2018

Very-High-Speed Permanent Magnet Motors: Mechanical Rotor Stresses Analytical Model

Yves Perriard, Guillaume Paul-André Burnand, Douglas Martins Araujo

In the context of the development of a 500’000 rpm miniaturized permanent magnet motor, a 3D analytical model for the assessment of mechanical stresses is presented. The significant mechanical stresses and thermal constraints encountered at such speeds are ...

2017

Sensorless Method with Parameter Identification Applied to a Bistable Fast Linear Switched Reluctance Actuator for Textile Machine

Yves Perriard, Douglas Martins Araujo, Faguy Tamwo Simo

This paper provides a sensorless method to control the position of keys passing through a linear actuator used in an industrial textile machine. The presented method describes how to find out the position of the key using two cascading discrete Kalman filt ...

2017

Modeling, Design, and Manufacturing of Microfabricated Coils With High Inductance Density

Yves Perriard, Florian Louis Copt, Yoan René Cyrille Civet, Jasha Poliakine, Douglas Martins Araujo

This paper addresses the design and manufacturing of small scale square planar coils with inductance densities ranging from 2 to 19 miH.mm-2. The design strategy is based on both analytic formulas and finite element method (FEM). Two different manufacturin ...

Institute of Electrical and Electronics Engineers2017