the paper presents the optimization results for several electrical machines dedicated for powered electric wheel-chairs. The optimization, using the Hook-Jeeves algorithm, was employed based on a design approach which takes into consideration the road conditions. Also, through numerical simulations (based on finite element method), the analytical approach was validated. The optimization approac...

(40) Where zi is the charge number of species i in the solution. Mass transfer arises either from the differences in electrical or chemical potential or from the movement of a volume element of the solution. It can occur due to: • Migration which is the movement of a charged body due to an electric field, i.e., an electrical potential gradient. The flux density of a species i in the solution du...

Aalto University, P.O. Box 11000, FI-00076 Aalto www.aalto.fi Author Paavo Rasilo Name of the doctoral dissertation Finite-Element Modeling and Calorimetric Measurement of Core Losses in FrequencyConverter-Supplied Synchronous Machines Publisher School of Electrical Engineering Unit Department of Electrical Engineering Series Aalto University publication series DOCTORAL DISSERTATIONS 159/2012 F...

This paper presents a nonlinear circuit-coupled 2D finite element model for use in the dynamic simulation of electrical machines with multiple sets of windings, connected to an external electrical circuit, and with rotating parts. An inductance is introduced to account for the 3D end effects on phase inductance, due to the end windings and axial fringing field. The model is applied to the simul...

Nanowire networks have great potential in many industrial applications, including batteries, electrical circuits, solar cells, and sensors. In this paper we focus on a specific hydrogen gas nanosensor whose sensing element is a network of palladium nanowires. The nanosensor is modeled using a square, equilateral triangle, and hexagonal lattice. We provide the reliability behavior of this nanose...

This paper considers a new switched reluctance motor (SRM) structure aiming at high starting torque with low volume. For some applications such as EVs (Electrical Vehicles), the motor volume and starting torque is a critical point in its design. In many methods, reducing the motor volume causes reduction in starting torque and decreases the motor efficiency. Unlike conventional SRMs, the rotor ...

The electrical impedance behavior of gellan gum (GG), GG-carbon nanotube, and GG-carbon nanofiber hydrogel composites is reported. It is demonstrated that the impedance behavior of these gels can be modeled using a Warburg element in series with a resistor. Sonolysis (required to disperse the carbon fillers) does not affect GG hydrogel electrical conductivity (1.2 ± 0.1 mS/cm), but has a detrim...

The detailed study of electrical power systems is a key element of many curricula in Industrial Technology. A novel laboratory set-up has been designed and implemented at the University of Northern Iowa as an instructional resource for teaching electrical power system and renewable energy concepts. The set-up consists of a photo-voltaic solar-cell array, a mast mounted wind generator, lead-acid...

Electroencephalography (EEG) is used to obtain information about the electrical activity in the brain and is routinely used to diagnose neurological abnormalities. The inverse problem in EEG refers to the procedure of locating electrical sources in the brain from the extracranial electrical field measured on the scalp. The solution of the inverse problem requires the forward calculation of the ...

At present, the finite element method has been widely used in electrical engineering; value has an absolute advantage in the field of solving the problem of position in the electromagnetic boundary. From the perspective of historical development, for solving the electromagnetic boundary value problems, four kinds of methods are used namely; graphical method, simulation method, analytical method...