A5022677454- Electric Motor Design and Analysis
- Magnetic Bearings and Levitation Dynamics
- Sensorless Control of Electric Motors
- Magnetic Properties and Applications
- Multilevel Inverters and Converters
- Induction Heating and Inverter Technology
- Silicon Carbide Semiconductor Technologies
- Advanced DC-DC Converters
- Electric Power Systems and Control
- Magnesium Alloys: Properties and Applications
- Wireless Power Transfer Systems
- Engineering and Technology Innovations
- Heat Transfer and Optimization
- Congenital heart defects research
- Heat Transfer and Boiling Studies
Atlantic Environmental Research Center
2025
University of Nottingham
2017-2024
An important barrier to the adoption and acceptance of synchronous reluctance (SyR) machines in different applications lies their non-standardized design procedure. The conflicting requirements incurring at high speeds among electromagnetic torque structural thermal limitations can significantly influence machine performance, leading a real challenge. Analytical models used for purpose lack accuracy force designer heavily rely on finite element analysis (FEA), least during refinement stage....
Squirrel cage induction motor is the most widely adopted electrical machine in applications directly fed by main grid. The analysis, design, and optimization of this topology has been addressed a considerable amount literature over last century. Although its wide adoption, especially when carried out an automatic fashion, still presents significant challenges because accurate prediction performance requires time-consuming finite element analysis. This work proposes systematic approach to...
The design of synchronous reluctance machines with and without permanent magnets assistance constitutes a challenging engineering task due to the numerous variables performance indexes be considered. complexity increases even further when application requires high speed operation, consequent rotor structural constraints related effects on electromagnetic performance. Structured as two-parts companion papers, this work proposes comprehensive procedure able consider all non-linear aspects...
This paper presents a comprehensive comparative design exercise of Synchronous Reluctance (SyR) machines considering different soft magnetic materials and wide range speeds. First, general methodology able to consider all the consequences selecting is presented. In fact, non-linearities, rotor structural limitations rise both stator iron losses are considered. The adopted approach allows achieving optimal geometries balancing these competitive multi-physics aspects keeping constant cooling...
In many industrial applications the self-starting capability of electric motors is still an important requirement enabling to simplify drive architecture and increase system's reliability. The efficiency improvement this motor topology has been targeted by various national international regulatory authorities with ad-hoc policies. Indeed, a lower energy consumption leads twofold benefits reducing operational costs <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML"...
The rotor slot geometry of a squirrel cage induction motor plays the most important role in defining torque-speed characteristic when power supply is directly provided by main grid. In this article it shown how can be optimised to satisfy different electromechanical requirements, depending on specific applications. This work, second two companion papers, briefly recalls novel systematic approach, proposed Part I, perform optimization motors. Here, results achieved satisfying wide spectrum...
Nowadays, finite element analysis represents the most accurate tool to analyse electrical machines. However, time domain resolution of electromagnetic problem, in some cases, requires long simulation due induced nature currents. The computational burden increases when machine features a skewed layout on stator or rotor structures, since this 2D multi-slices approximated even full 3D model. In paper, general analytical method model devices is applied squirrel cage induction motor featuring...
The paper presents a comparative study among three methods which allow to estimate induction machines performance through finite element analysis. first two approaches evaluate the by means of non-linear circuital approach whose parameters are calculated specific set simulations. Those strategies differ each other on calculations performed for determination. third method is based voltage fed time step simulations carried out different operating points. Being latter most accurate, it...
Among the electro-mechanical devices transforming energy from electrical to mechanical, squirrel cage induction motor can be surely considered a workhorse of industry due its robustness, low cost, and good performance when directly fed by ac grid. Being most influencing topology in terms consumption, optimizing efficiency motors could lead great impact toward reduction human environmental footprint. The design aided finite element analysis presents significant challenges because an accurate...
Synchronous reluctance (Syn-Rel) machines with embedded permanent magnets (PMs) are research hotspots in variable speed motor drives due to their robust rotor structure and wide constant power range (CPSR). In this article, the potential of PM-assisted Syn-Rel machine be next generation heavy duty traction solution has been investigated, special attention put on one key geometric parameter, i.e., airgap length. Careful design optimization conducted based parametrization including length...
This article proposes a modular approachto the power sharing control of permanent magnet synchronous bearingless machine. The selected machine topology features winding layout with phases distributed into nonoverlapping three phase groups, solution whose twofold aim is to increase fault tolerance and allow for radial force generation. subwindings are supplied by standard three-phase inverter, leading system architecture. A throughout explanation methodology used develop algorithm presented...
The insertion of permanent magnets (PMs) within the rotor slots Synchronous Reluctance Machines (SyRM) is most common design strategy used to increase significantly their performance. In this paper it shown how a magnet assisted synchronous reluctance machine (PMaSyRM) can be optimized satisfy all electromagnetic and structural constraints arising as maximum operating speed increases. This done considering variety PMs material. work, second two companion papers, briefly recalls novel...
A general middle complexity model of electromagnetic devices is applied to a cage induction motor. Such modelling approach has been simplified and adapted in order pursue fair representation the electrical machine. Particular attention was given rotor cage, proposing exploiting symmetry itself. comparative analysis vs results provided by finite element also presented for validation purposes aiming assess accuracy proposed method.
Low torque ripple of electrical machines is an important requirement for many different applications. The causes fluctuations in squirrel cage asynchronous induction motors might be a challenging task due to the complex phenomena raised by whole set rotor bars. This paper proposes accurate analysis contributions distinguishing time-varying, synchronous and components. investigation performed adopting general analytical approach based on circuital modelling technique electromagnetic devices....
This paper presents a comprehensive comparison between squirrel cage induction motors optimally designed with single and double cages for direct main-fed applications. The effect of adopting open closed rotor slot geometry is also deeply investigated. design-based makes use an innovative fast accurate performance evaluation method embedded into automatic design procedure to optimize different geometries. aim this work quantify the advantages drawbacks structures in terms starting rated same...
The push towards the concept of More Electric Aircraft (MEA) and Engine (MEE) has introduced new challenges in electric machines design. In fact, eventual integration starter/generator directly into engine envelope would allow to remove any accessory gearbox, leading a potential improvement overall reliability efficiency system with consequent reduction environmental impact. However, an machine within turbo-fan requires completely design approach, since conventional materials cannot...
Line-Start Permanent Magnet Motors are a valid alternative to conventional three-phase induction motors and wound-field synchronous machines for fixed-speed applications direct fed by the grid, targeting superior efficiency high reliability. A general analytical-numerical approach is presented model SPM type rotors with embedded squirrel cage, aiming permit completing both preliminary design an effective assessment of starting synchronisation capabilities. As case study, 8 MW @ 3000 rpm...
Synchronous Homopolar Generators represent an attractive solution for the future of power generation in propulsive systems based on hybrid turbo-electric drivetrains. In fact they feature both a fully controllable excitation, similar to wound-field synchronous machines, and very robust rotor like switched reluctance machines. The above features make this machine topology promising alternative also PM generators, even when DC buses have be supplied via diode rectifiers. preliminary...
The drivetrains of large transportation systems, such as aircraft or ships, are evolving towards hybrid turbo-electric solutions with DC primary power distribution, aiming to reduce the related greenhouse gas emissions. Synchronous Homopolar Generators (SHGs) equipped front-end diode rectifiers a promising technology for on-board generation units. Following work presented in previous publications, design 2 kW@6000 rpm concept demonstrator is here refined by means 3D-FE analysis, considering...
Typically, electrical machines feature rotor and stator winding configurations core structures which comply with both simplicity cost requirements. Such constraints limit the design search space degrees of freedom, thus leading to exploit implement only standard symmetrical layouts therefore represent by far most common choice. In this paper, potential adopting non-symmetrical windings geometries in is discussed. The perceived benefits are first detailed then proven applying concepts two...
In this paper, a general approach to control multi-sector and multi-three-phase bearingless motors is proposed considering winding layouts with different number of sectors. Both performance efficiency are investigated for each design solution particular emphasis on the rotor losses during operation. The effect sectors eddy current in permanent magnets analyzed current-sheet methodology order reduce computational burden analysis. This used first time field its validation carried out by means...
In recent years, synchronous reluctance (Syn-Rel) machines are research hotspots in variable speed motor drives due to their robust rotor structure and wide constant power range (CPSR). More practically, when kVA limitation is considered, embedded permanent magnets (PMs) have been widely adopted Syn-Rel rotors further increase density as well factor. this paper, the authors investigated potential of PM-assisted machine be next generation electrical propulsion topology for automotive...