Daniel Fodorean

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.

Design and Optimization of a Switched Reluctance Motor Driving a Compressor for a PEM Fuel-Cell System for Automotive Applications

This paper describes the design of a high-speed three-phase switched reluctance machine to drive a compressor for the air management of a fuel-cell system for automotive applications. The machine geometry is optimized by means of a finite-element method coupled to a genetic algorithm. The performance of the optimized machine is evaluated, taking into account the iron and air-friction losses. Some theoretical and numerical results are sustained by the measured ones in the same operating conditions.

Analysis of Fault-Tolerant Multiphase Power Converter for a Nine-Phase Permanent Magnet Synchronous Machine

The use of electrical drives and machines with very high number of phases is not a common topic of researchers, because of the control difficulties and the important number of switches needed to assure the operation in faulty conditions. The advantage of using a high number of legs/phases provides smooth mechanical performances (i.e., reduced torque ripples), without increasing the number of poles (this last approach, is usually applied for fractional-slot machines, increases frequency, and consequently the iron loss). The authors are proposing a nine-phase drive to supply a permanent magnet synchronous machine. A prototype of nine-phase drive machine is constructed. Its capability to operate in faulty conditions will be evaluated by numerical computation and tests. It will be proved that the proposed solution can operated even in the most severe faulted conditions (78% of the drive machine being faulted).

Study on a simplified converter topology for fault tolerant motor drives

Some of the recent research activities in the area of electrical machines and drives for critical applications (such as aerospace, defence, medical, nuclear power plants, etc.) are focused on looking for various special motor and converter topologies. Nowadays by the help of recent technological advances and developments in the area of power electronics and motor control the fault tolerant electrical machine and drive concept is at a level where it begun to be feasible to be used in practice [1]. Therefore any new results could be of real interest for all the specialists working in these fields. In the paper a simplified power converter topology is proposed for a nine-phase fault-tolerant permanent magnet synchronous machine. By coupled Flux 2D and Simulink transient simulations the behaviour of the drive system under different winding fault conditions is studied. It is proved that using the simplified converter topology near the same torque development capability of the machine in faulty states can be assured. Short discussion on making the converter also fault-tolerant is included in the paper, too.

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.

Multimodel Optimization Based on the Response Surface of the Reduced FEM Simulation Model With Application to a PMSM

This paper presents an analytical method for improving the optimal design of electromagnetic devices obtained analytically. This method extracts the significant parameters by using the gradient of difference between the outputs of the analytical model and those obtained with a finite-element method. These parameters are then employed to build a response surface in a reduced dimension space by using the moving least square method. To assess its viability, we compared our method to another recent approach in the optimal design of a permanent-magnet synchronous motor. The results show our methods superiority in terms of improvement of the solution and approximation of the real objective function .

Motorization for an Electric Scooter by Using Permanent-Magnet Machines Optimized Based on a Hybrid Metaheuristic Algorithm

This paper deals with the proposition of a permanent-magnet (PM) machine used to motorize an electric scooter. Several electrical machine configurations are discussed, and the best solution is chosen. The power density and the energetic performances of the chosen machine (with a fractional-slot configuration) are improved using a hybrid optimization algorithm, which combines simulated annealing (SA) and particle swarm optimization (PSO) techniques. The obtained results are numerically and experimentally validated to prove that the proposed solution suites the scooter application.

FOC and DTC Techniques for Controlling a Double Excited Synchronous Machine

The double excited synchronous machine (DESM) which was designed, analyzed and constructed by the authors should offer an improved efficiency while speed is increased beyond the rated one, and the goal of this paper is to prove it. By using two control techniques, field oriented control (FOC) and direct torque control (DTC) the advantages of the studied prototype are revealed through numerical analysis (by using Matlab/Simulink and Flux2D software). Finally, the tests come to support the performances obtained by numerical calculation.

Study of a High-Speed Motorization With Improved Performances Dedicated for an Electric Vehicle

This paper presents the study of an entirely electromagnetic traction system to be used for electric vehicle (EV) application. To have a reduced mass and compact system, the electric motor will work at 40500 r/min. Usually, the high-speed electrical machines are rather used for ventilation or compressor systems, with low dynamics. The high variation of the load torque in EV application demands the best possible mechanical/energetic performances. The traction system proposed here is composed by a high-speed permanent magnet motor linked to a magnetic gear. This paper will present the technology of the entirely electromagnetic traction chain and its energetic and mechanical performances. The results are validated numerically through finite-element analysis.

Comparison of the main types of fault-tolerant electrical drives used in vehicle applications

A comparative study of several fault-tolerant electrical drives is presented in this paper. As the application is concerned, the authorspsila attention was oriented towards the vehicle transportation. Thus, the main electrical drives under study are: the induction, the switched reluctance and the permanent magnet synchronous machine, respectively. The present work will explore the aforementioned drivespsila capabilities in terms of fault-tolerant operation. The authors present a substantial study for the fault-tolerant issue in electrical drives by using finite element method (FEM). During this numerical analysis many phenomenon will be emphasized and, coming together with some tests, final conclusions will be depicted.