Radu Martis

Synchronous reluctance motors for small electric traction vehicle

The paper present the analysis of the performances of an electrical machine used for small power automotive application. The electrical machine under study in this paper is a small flux synchronous reluctance machine (SynRM) with 4 poles and 24 slots. The analysis of studied machine will be carried out both analytically and numerically in SPEED program and Flux (2D and skewed solver).

Design and analysis of slot-pole combination for synchronous reluctance machine with concentrated windings for automotive applications

Synchronous Reluctance Machines (SyncRM), began to draw a lot of attention in last decade and presently receives a great deal of interest, since the cost of active materials is much lower than for a Permanent Magnet Synchronous Machine. For automotive applications a high torque and power density, low torque ripple and a wide speed range is required. The synchronous reluctance machine is still under development and intensive investigation is being carried out. This paper presents the influence of stator and rotor pole number combinations with a stator configuration which for cost reduction purposes uses only concentrate windings.

Coupled electric — Thermal model for SR-drives

In automotive applications detailed multi-domain modeling and testing at component and sub-component level is necessary to improve the understanding and design capabilities for higher performances and lower costs. New and faster tools are required to reduce the development and testing time and effort for electrical actuated automotive sub-systems. The paper presents a thermal model to simulate and evaluate the behavior of a Switched Reluctance Motor (SRM) at sub-system level under specific automotive testing scenarios. The model is created in a multi-domain simulation environment (AMESim©) that can be coupled to other commercially or open source available physics-based tools, for a more accurate evaluation.

Comparative analysis of rare earth-less electrical machines for 48V automotive cooling fan applications

This paper brings into attention two types of rare earth-less electrical machines designed to be used for an automotive cooling fan (CF) application. A low-power induction machine and a variable reluctance synchronous machine will be analyzed based on the requirements of a 48V/850W CF. Specific design issues requiring attention when designing these two motors for such an applications will be pointed out. The analysis is done via numerical means and it is focused on obtaining the most important electro-mechanical quantities. Based on these analyses a side-by-side comparison between two motors is performed and some conclusions will be made in the final part of the paper.

Common and normal mode currents in PMSM PWM drives

The paper approaches the high-frequency equivalent circuit of permanent magnet synchronous machines (PMSM) with different pole number, and its response to PWM-based supplying current. The model is implemented in MATLAB-Simulink, and the phase currents, as well as the common and normal mode currents are analyzed.

Multiphysics design, analysis and optimisation platform of PMSM for automotive applications

The present paper describes a CAD platform that combines analytical design, numerical electromagnetic and vibro-acoustic analysis of Permanent Magnet Synchronous Machines for automotive drives systems with a large range of rated power. For dynamic validation and transient behavior two control strategy were taken in consideration (speed and torque control).

Vibro-acoustic behavior vs. conductive interferences in PMSM drives

In this paper, a simplified high frequency model of the Permanent Magnet Synchronous Motor (PMSM) as well as the motor drive were developed and analyzed using Simulink. The currents in the normal and common mode paths were extracted and compared with the analytical results. A Finite Element Analysis (FEA) was performed on two PMSM with different topologies in order to obtain the radial forces on the stator teeth. The results were analyzed in order to try to establish a link between said forces and the high-frequency emissions that are present in the system.

Permanent Magnet Synchronous machines for small energy-efficient applications

From aerospace to automotive, and from telecommunications to medical devices, high reliability and performance driving systems are required [2]. The present paper aims the design and analysis of Permanent Magnet Synchronous Machines (PMSM) with external rotor topology for direct-driven compact centrifugal pump systems. The whole CAD process, using both analytical and numerical methods is described. Two PM polarization patterns are considered and the performances of the machines are compared.

Analysis of maximum torque per ampere control strategy for variable reluctance synchronous machines for traction applications

Nowadays there is a serious trend to design electrical machines for propulsion units as cheep as possible. Machines that lack the permanent magnets having performances close to those that embed permanents magnets represent now the main interest in this field. Such a machine is the variable reluctance synchronous machine. Being derived from the family of synchronous machines is field oriented controlled. In the present paper one particular such machine is presented in detail designed for automotive applications. An analytical model is also presented used later to implement the maximum torque per ampere control, considering this strategy as being the one suitable for such applications. The simulation program is built in Matlab Simulink presented together with the control strategy and the results. The model of the machine takes into account both saturation and iron losses.