K. Biro

Novel Permanent Magnet Tubular Linear Generator for Wave Energy Converters

Clean and sustainable alternative energy is becoming attractive as oil costs rise and the negative side effects of traditional energy systems begin to become apparent. One often overlooked, but still rapidly growing alternative is wave power. There are fascinating new designs for harnessing the tremendous power of the waves. Hence any contribution in this field could be of real interest for numerous specialists. In the paper a novel modular permanent magnet tubular linear generator is proposed and analyzed by means of numeric field computations. It was designed for wave power take off systems to be placed in the Black Sea near the Romanian coasts.

Multi-Phase Synchronous Motor Solution for Steering Applications

This paper presents the analysis of a six-phase permanent magnet synchronous machine (PMSM6) dedicated for electrical power steering system applications. The motor design is brie∞y described, as well as the construction of the studied motor. The study is validated by flnite element method and via experimental results. Some simulated results prove the machines capability to work even in faulty conditions. The operation of the machine was evaluated in generator and motor operation. In motor operation, the PMSM6 was fed based on scalar control.

Design and testing of a four-sided permanent magnet linear generator prototype

In the perspective of the fossil fuels deposits depletion new energy resources must be developed; amongst them the renewable energy sector seems to be able to provide a long term solution. Besides the already popular wind, solar or thermal energies, the ocean energy sector offers a virtually infinite energy potential; many solutions for harvesting and converting this energy into usable form are under investigation, most of them using complex mechanical or hydraulic systems to convert the slow, linear movement specific to waves into rotational movement, compatible with the classical electric generators. Our focus is on systems using linear electric generators, offering higher efficiency and reliability, the present paper presenting the stages covered to choosing, designing, building and testing a linear generator.

Simulation of Wind Turbine Driven Autonomous Squirrel Cage Induction Generators

Due to increased emphasis on renewable resources, the development of suitable isolated power generators driven by energy sources such as wind, small hydro-electric, biogas, etc. have recently assumed greater significance. The capacitor self-excited squirrel cage induction generator has emerged as a suitable candidate of isolated electrical power sources. In this paper such a system is studied both by means of laboratory tests and by simulation.

On the dynamic model of a doubly-salient permanent-magnet motor

An analytical model has been developed allowing the dynamic performance prediction of a new doubly-salient permanent-magnet (DSPM) motor. The configuration and the operation mode are briefly explained, and the need for a dynamic model is justified. Nonlinear magnetic circuit analysis and finite element calculations are employed for determining the winding inductance and flux linkage. The developed nonlinear description of the DSPM motor dynamics is a basis for a future work on the energy-optimized control of adjustable-speed drives using DSPM motors.

Analysis of material influence on the performance of the dual-rotor Permanent Magnet Induction Machine

A novel type of machine, the Permanent Magnet Induction Machine, is currently in the process of development. The objective of this paper is to analyze the influence of different materials on the performance of the PMIM. At the same time it provides a meaningful comparison between this type of machine and the classical Permanent Magnet Synchronous Machine (PMSM) with surface mounted PMs, which represents its major alternative in terms of high efficiency and high torque density. The comparison consists of the effects the magnet material (ferrite or rare earth magnets) has on both machines, as well as the influence of the rotor bar material (Aluminum or Copper) for the PMIM, considering an identical stator frame and winding configuration. This article will demonstrate that the PMIM can substantially improve machine torque density and efficiency in comparison to the PMSM.

Comparative analysis of the claw-pole rotor dimensions influence on the performances of a claw -pole generator for wind applications

In small ratings, direct-driven wind power applications multiple permanent magnet generators have become very attractive. Connected directly to the turbine axis, this type of electrical machine contributes to low price energy (the energy loss is diminished through the conversion, the turbine performance is increased) and to the reduction of the noise - this would be a very important aspect in case the turbine is placed nearby the localities. The present paper approached the magnetic field analysis of a claw pole permanent magnet rotor topology for a synchronous machine, suitable for small wind power application, by means of the 3D finite elements method.

Investigation on the thermal behavior of the dual-rotor Permanent Magnet Induction Machine

The present paper proposes an investigation of the thermal phenomena caused by Joule losses and iron losses in a novel electric machine, the dual-rotor Permanent Magnet Induction Machine (PMIM). Empirical dimensionless formulations for the computation of convection heat transfer coefficients in each region of the machine are employed together with 3D FEM computation to predict temperature distribution. The analysis of the thermal behavior is equally as important as its electromagnetic design because improper heat transfer design of electrical machines can lead to material damage. The presence of the permanent magnets makes this study essential as it is required to verify that the temperature of demagnetization is not reached.

Design of six-phase synchronous and induction machines for EPS

This present paper will approach the design and analysis of two six-phase electrical machines, a synchronous permanent magnet and a squirrel cage induction motors, for electrical power steering systems. Finite element method will be used in order to analyze, in a comparative manner, the performances of the two electrical machines.

Performance assessment of an integrated starter alternator for hybrid electric vehicles

Hybrid electric vehicles are a viable alternative to full electric vehicles until more efficient and cost effective batteries or fuel cells are developed. The mild hybrid vehicle is a step in the transition of mass produced cars to full hybridization. At the heart of the mild hybrid is the integrated starter alternator (ISA) unit. This paper presents hybrid electric vehicle architectures with an emphasis on the ISA hybrid architecture. The operation modes of an ISA system and the constraints for an electric machine acting as an ISA are detailed. Finally a model for a ISA hybrid vehicle, developed in AMESim is presented and the results of a simulated drive cycle are presented.