Dan-Cristian Popa

Improved design of a linear transverse flux reluctance motor

The paper deals with a new type of the reluctant linear transverse flux machine. Different possibilities to improve the basic structures performance are outlined. The improved machine structure is compared with that of the initial one by means of FEM-based numerical magnetic field analysis. The flux densities in the two types of machines and their static characteristics (tangential and normal forces vs. displacement) are compared. The laboratory model of the improved machine is also given in the paper.

Compact Double-Sided Modular Linear Motor for Narrow Industrial Applications

Linear drive technologies are steadily expanded in various applications, especially in industry, where high precision electrical direct drive systems are required. In this paper a double-sided variant of a novel direct driven modular permanent magnet linear motor is presented. Its characteristics are computed by means of 3D FEM magnetic field analysis. An interesting industrial application in which it can be used is also presented

Fault tolerant permanent magnet machines used in automobile applications

The paper deals with the fault tolerant analysis of several permanent magnet synchronous machines (PMSM) used in hybrid automobiles. There will be treated 3 distinctive elements: the electrical traction, the starter/generator and the steering system. By means of numerical analysis and through experiments, three different types of PMSM and their drives will be verified, while the fault tolerant concept is employed and verified.

On the Usefulness of Simulation in Designing a Permanent Magnet Modular Surface Motor for Advanced Mechatronic Systems

The design of advanced mechatronic systems involves the integrated design of the mechanical system, of the actuator assuring the precise movements inside the system and of its control unit. In order to make proper choices early in the design stage, innovative tools are required to model and simulate both the entire physical system and each subsystem which are composing the mechatronic device. The usefulness of simulation techniques will be demonstrated through the design and building-up of a permanent magnet modular surface motor, which can assure very precise planar movement in the framework of any mechatronic system

Tubular transverse flux variable reluctance motor in modular construction

A new topology of modular tubular motor is presented. It is a variable reluctance transverse flux machine with no permanent magnets. Firstly its construction is detailed. Some elements of the developed design algorithm are given, too. A sample machine was sized. It was analyzed by means of numeric field computations. The paper also contains a study concerning the influence of several parameters on the behavior of the machine. Finally, some possible applications are discussed.

Study of a high-speed motorization for electric vehicle based on PMSM, IM and VRSM

The paper presents the study of a high speed motorization dedicated for electric vehicle (EV). Three types of electrical machines are analyzed: permanent magnet synchronous machine (PMSM), induction machine (IM) and variable synchronous reluctance machine (VRSM). They are studied from the electromagnetic point of view, with closer look on the power density, energetic performances and torque wave (this last parameter being critical while controlling the transients on the EVs motorization). Mechanical aspects will be also treated, since they are influencing the losses and since the presence of centrifugal forces could irreversibly affect the structure of the motors. The best suited variant is constructed and preliminary information on the prototype is given.

Optimized Design of a Novel Modular Tubular Transverse Flux Reluctance Machine

This paper presents a new type of tubular electrical machine with a modular construction. The structure of the machine, concerning its construction, is discussed in the first part of the paper. A semi-analytical method based on the magnetic equivalent circuit calculation is used in order to obtain the flux densities in different parts of the iron core of the machine. A Gauss elimination procedure is applied to the system of linear equations resulted from the magnetic equivalent circuit, in order to express the flux in the air gap. The problem of optimization of the traction force is analyzed. The maximization of the function is handled with the Nonlinear Conjugate Gradient method and verified with a Gauss Newton algorithm. An application of the presented theory shows the usefulness of this approach. The results provided by the optimization method applied on a designed tubular machine illustrate its advantages. A numerical analysis performed on both a designed and then optimized structure confirmed the results obtained in the optimization process.

A survey on green energy harvesting applications using linear electric generators

This paper presents a comprehensive survey of the energy harvesting concept in the current social and technological context, with the intent to draw attention to linear generators, in different topologies, as competitive candidates in green energy conversion microsystems. The emerging technologies of energy scavenging are discussed, examining both the environmental sources and a selection of applications based on this concept; consequently, an insight report of appropriate linear generators based on this concept is done, outlining aspects regarding their design methodology and modeling. The portability of the harvesting system, with some implemented applications, is also a subject of concern that is taken into account in this review, intended to highlight the main advantages and disadvantages of these scavenging techniques and to validate the challenges of using linear generators in this scope.

Theoretical and Experimental Study of a Modular Tubular Transverse Flux Reluctance Machine

There is an impetuous need for easy-to-build electrical machines with high specific thrust for various applications. The paper deals with a new modular variable reluctance tubular machine. It is a transverse flux machine without permanent magnets. Its construction is detailed and the novelty of the proposed structure is emphasized. A sample machine is analyzed by analytical and numerical means. The results of the analyses are validated by testing a laboratory model of the motor.

Design of induction motor for electric power-assisted steering systems

This paper presents a perspective regarding the design concepts of a small induction machine used for electrical steering systems. The particularity of this view is given by the fact that besides the output imposed parameters the geometrical dimensions are subject to major constraints. In these conditions there are some theoretical aspects that limit from the start the design choices that can be made. After approaching the design from the theoretical point of view, a numerical analysis which validates the choices made in that stage is done. A comparison between possible solutions gives a better view on the possible use of the induction machine for this kind of application.