Ioan-Adrian Viorel

A Double Excited Synchronous Machine for Direct Drive Application—Design and Prototype Tests

This paper presents the analytical, numerical, and experimental results obtained with a double excited synchronous machine (DESM) prototype designed and constructed for an electric vehicle traction system. To obtain a wide speed range, the flux-weakening technique is implemented. Analytical design, 2-D finite element method (FEM) analysis, thermal analysis, and prototype construction of the DESM are discussed, and the performances are assessed with experimental data.

Study on fault tolerant switched reluctance machines

The papers goal is to compare a usual switched reluctance machine and a fault tolerant variant of it. By coupled Flux 2D and Simulink transient simulations the behaviour of the fault tolerant drive system under different winding fault conditions were studied. It was proved that using the proposed machine structure and converter topology same torque capability of the machine in faulty states as in healthy conditions can be assured. A short discussion on fault-tolerant converters is included in the paper, too.

Speed-thrust control of a double sided linear switched reluctance motor (DSL-SRM)

The speed and thrust control strategy for a double sided linear switched reluctance motor (DSL-SRM) is elaborated in the paper, based on a simplified analytical model. The strategy is defined for different motor phase supply conditions and the dynamic characteristics are calculated via computer simulation for a sample motor, in order to sustain the theoretical results.

Switched reluctance motor analytical models, comparative analysis

Two categories of analytical models developed for switched reluctance motor (SRM) are discussed in the paper. The models are based on motor geometry data and respectively on finite element method (FEM) analysis results. For an existing and tested sample SRM the flux linkage and the torque characteristics were calculated via all considered models and the results were compared with the FEM analysis based calculated characteristics. Finally the merits and the weak points of each model were evinced.

On the Single-Sided Transverse Flux Machine Design

The transverse flux (TF) machine has an excellent torque-to-volume ratio in comparison to conventional machines. For this reason, the TF machine is well suited for direct drive systems. The electromagnetic design procedure of a TF machine consists of two main parts. In the first part of this article the main dimensions, parameters, and performance are estimated. In the second part, the magnetic circuit is optimized and the steady-state characteristics are computed by using a three-dimensional finite element method (3D-FEM) analysis. In this article, a comprehensive coverage of the first part of a TF machine design procedure is given, taking into account the already reported results and the existing experience. The sizing equation is obtained and the estimation procedure is applied in an example, resulting in a fully designed TF machine. The present work can serve as a guideline for a TF machine designer who wants to have a first machine estimation.

Transverse flux tubular switched reluctance motor

A transverse flux tubular switched reluctance motor of a particular construction is presented. The traction force equations are obtained based on two simplified models and a sizing designing procedure for the motor is developed. A two dimensions finite element method (2D-FEM) analysis is performed in order to check the analytically calculated performance and a sample motor is designed and analyzed.

On The Possibility To Use A Hybrid Synchronous Machine As An Integrated Starter-Generator

The hybrid and mild hybrid cars require high performance integrated starter-generators (ISG). Several electrical machines were designed and used as ISGs up today. A hybrid synchronous machine (HSM) to be employed for such purpose is proposed in this paper. The HSM has the excitation field produced both by permanent magnets and auxiliary excitation winding. Three construction variants of the HSM were studied comparatively. A prototype was designed, constructed and tested. The background of the HSM, operating as a generator is discussed, too. All the obtained results, by tests or by computer simulations, emphasise that HSM could be an excellent ISG for a hybrid car.

A simple analytical model of a permanent magnet transverse flux motor with a particular disk rotor

In this paper a simplified analytical model, useful in a sizing-designing algorithm, is developed for a transverse flux motor with a modified double-sided stator and a permanent magnet (PM) disk rotor. The performances are calculated analytically using magnetic equivalent circuits for aligned and unaligned rotor position and checked against the ones obtained via three dimensions (3D) finite element method (FEM) analysis. The results yielded by both methods show a good agreement.

Design of a permanent magnet flux-switching machine

In this paper a typical structure of a permanent magnet flux-switching machine (PMFSM) with 12 stator poles and 10 rotor poles is considered. The PMFSM design procedure is based on a specific analytical algorithm, which is validated by the results obtained via a two dimensions finite element method (2D-FEM). Also an optimal design procedure, based on Hooke-Jeeves method, applied to a permanent magnet flux-switching machine is implemented. Different objective functions, as maximum torque density and maximum efficiency were considered.

On the designing procedure of a permanent magnet transverse flux generator (PMTFG) with specific topology

The permanent magnet transverse flux (PMTF) machine operates at low speed and is capable of producing power densities larger than the ones produced by conventional machines. The PMTF machine has the advantage of modularity, since each phase is an independent module. Due to these features, a PMTF machine can be an excellent option for low and medium power, low speed gearless generators. In this paper a sizing-designing algorithm is developed and, for a sample generator, with a quite simple structure the performances are calculated and checked against that obtained via 3D finite element method (FEM) analysis. A set of TF motors were designed and their performances were compared to evince the features and the break points of the PMTF machine proposed.