A5083962486- Electric Motor Design and Analysis
- Magnetic Bearings and Levitation Dynamics
- Induction Heating and Inverter Technology
- Magnetic Properties and Applications
- Advanced DC-DC Converters
- Silicon Carbide Semiconductor Technologies
- Multilevel Inverters and Converters
- Design Education and Practice
- Sensorless Control of Electric Motors
- Wireless Power Transfer Systems
- Prosthetics and Rehabilitation Robotics
- Real-time simulation and control systems
- Robotic Locomotion and Control
- Advanced Battery Technologies Research
- Refrigeration and Air Conditioning Technologies
- Mechanical Engineering and Vibrations Research
- Thermal Analysis in Power Transmission
- Muscle activation and electromyography studies
- Aerodynamics and Fluid Dynamics Research
- Vibration and Dynamic Analysis
- Electric and Hybrid Vehicle Technologies
- Heat Transfer and Optimization
- Turbomachinery Performance and Optimization
- Digital Storytelling and Education
- High voltage insulation and dielectric phenomena
University of Nottingham
2015-2024
Harvey Mudd College
2020-2022
Northumbria University
2012
Forest Trends
2002
In an electrical machine design, thermal management plays a key role in improving the performance and reducing size. End-windings are commonly identified as hot-spot. Hence, lowering predicting end-windings temperature crucial tasks of machines. This paper proposes investigates noninvasive but effective cooling method that aims for uniform machine's winding by implementing direct on its end-windings. Modeling experimental results show 25% hot-spot reduction particular application can be...
High-performance power conversion equipment is currently gaining an increasing interest for aircraft applications. In particular, isolated bidirectional dc/dc converters are often proposed modern distribution systems. A current-fed converter, named active-clamp active-bridge topology, identified as the most promising application, interfacing a 270-V dc network with 28-V network. comparison between selected topology and well-known dual-active-bridge has been carried out experimental prototype...
High performance and reliable electrical machines are often required in modern applications an appropriate thermal management allows to fulfil such demand. Thermal is crucial for improving performance, reducing size preserving the insulation lifetime of machines. From this prospective, a novel cooling method machine end-windings proposed present work. Its action focuses on end-windings, since they commonly identified as hot-spot. The effectiveness experimentally proved improvement, terms...
High performance power conversion equipment is currently gaining an increasing interest for aircraft applications. In particular, isolated bidirectional DC/DC converters are often proposed modern HVDC distribution systems. For such reason evaluation of several converter topology carried out considering the application, interfacing a 270V DC network with 28V network. A trade off has been three different topologies and experimental prototype manufactured selected architecture. Simulation...
This paper details a qualitative comparison between different types of electrical machine for hybrid electric vehicle traction applications. Targets set by the US Department Energy year 2020 are used as goals. Several this application will be discussed, focusing on benefits and challenges each when applied to these targets. Then machines compared based appropriate quality indices relative general performance characteristics. It is shown that interior permanent magnet most suited topology...
A close functional and structural integration of passive elements is required to improve the power density motor drives. Such power-dense drives are prerequisites in aerospace automotive applications. This article presents a permanent magnet with an integrated filter inductor, which not only eliminates inductor losses but also removes its associated weight volume. The uses motor's inherent magnetics order use it as inductance instead adopting external option, traditionally placed outside...
This paper presents considerations for the design of high performance, interior permanent magnet machines traction applications. These will be designed to reach FreedomCar 2020 targets set by US Department Energy year machines, considering both concentrated and distributed wound designs. The a trade-off study wide range motor designs with main focus on number rotor poles stator slots. results from this investigation are then used achieve an optimal in terms target requirements, as these...
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 paper presents design optimization of a short-term duty electrical machine for extreme environments high temperature and altitudes. For such environmental conditions above 80°C altitudes 30 km, thermal loading limits are critical consideration in machines, especially if power density efficiency to be achieved. The influence different material on the performance machines is investigated. Also, effect slot pole combinations studied used operating but with short duty. In research,...
Converter sizes are often dominated by passive magnetic components. Passive component in turn limited electromagnetic saturation and thermal limits. This paper covers two modifications to the air gaps of tape wound amorphous cores, made available advancement additive manufacturing with materials. These modifying width core at gap moving a different location core. The objective was reduce effect fringing flux, overcome issue high loss zone hot spot being generated gap, situated under...
This paper details the design process of a high performance electrical machine with objective achieving US Department Energy FreedomCar 2020 targets, namely meeting speed efficiency requirement without sacrificing elsewhere. The targets are detailed, short discussion challenges involved. All feasible topologies considered, and qualitatively compared in order to identify best candidate topologies. A set potential technologies evaluated establish primary geometry specifications, such as slot...
Power densities and power supply components have improved such that the major obstacle in using DC-DC converters is effectively removing heat from these devices. This paper shows practical theoretical removal issues through conduction, natural convection forced air convection. Thermal resistance its applications are discussed. derating how it applies to converter also
Recently, the synchronous reluctance machine limits have been pushed toward meeting requirements of traction applications. A skilled electromagnetic architecture a with help permanent magnets can push power density and speed range to that applications, however, mechanical integrity rotor still be in question. application means large diameter high rotational speed, two criteria makes challenging design, particular, mechanically. In this paper, multi-physics design steps assisted motor for...
High power density and high torque are the fundamental requirements for electric machines used in traction application. The former is obtained by potentially increasing speed of machine while latter using energy rare earth magnets. Ferrite magnets explored as a viable alternative to which relatively expensive geographically concentrated. paper intended bring out current trend vehicles (EVs) with due focus on permanent magnet assisted synchronous reluctance (PM-SynRel) machine. PM-SynRel...
Double-Stator-Single-Rotor (DSSR) surface-mounted Permanent Magnet Synchronous Generators (PMSG) have less active weight in contrast to the traditional direct drive high-power generators used offshore wind turbines. But due insertion of an extra stator a DSSR PMSG, cogging torque becomes more prominent, as it is produced interaction rotor magnets with slots and teeth stator. Therefore, there imperative need explore most effective methods diminish PMSG. This paper investigates different...
With the increased necessity of a high power density and efficient system in aerospace marine industries, integrated motor drives provide an excellent solution modern era. Therefore, close structural functional integration passive components has become prerequisite task to make compact overall system. This article reviews existing with technologies. To start, design aspect traditional filter inductors, using area product approach, is discussed. Subsequently, layouts inductors are presented....
Computational Fluid Dynamics (CFD) was used to carry out a fluid flow and thermal investigation of high power dense traction machine for electric commercial vehicle. One the features design considered is Length/Diameter (L/D) ratio; this can represent further challenge when performing design; indeed heat dissipation from stator core an issue. The aim work identify effective cooling configuration capable enhancing maintaining operating temperature whole within allowable limits. In paper CFD...
Environmental concerns and energy efficiency have been driving the transportation innovation in past decades. In this framework, hybrid city transport has receiving attention of industry. The challenges for application are required high-power density, lower maintenance cost high-temperature environment due to integration with internal combustion engine. A multiport converter is proposed realise requirements automotive industry achieve greater performance driveline electrification. platform...
Synopsis We develop a model of latch-mediated spring actuated (LaMSA) systems relevant to comparative biomechanics and bioinspired design. The contains five components: two motors (muscles), spring, latch, load mass. One motor loads the store elastic energy second subsequently removes which releases causes movement freely available software accompany model, provides an extensible framework for simulating LaMSA systems. Output from simulation includes information loading release phases...
Electrical machines with high torque density are required for traction application. Availability of bonded magnets complex shapes and magnetization pattern can significantly extend the design space electrical machines. This paper introduces a hybrid flux barriers to improve permanent magnet assisted synchronous reluctance (PM -SynRel) machine using ferrite magnets. The is found along entire range speed compared conventional barriers. barrier achieves similar performance that curved...
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...
We develop a model of latch-mediated spring actuated (LaMSA) systems relevant to comparative biomechanics and bioinspired design. The contains five components: two motors (muscles), spring, latch, load mass. One motor loads the store elastic energy second subsequently removes which releases causes movement open-source software accompany model, provides an extensible framework for simulating LaMSA systems. Output from simulation includes information loading release phases motion, can be used...
High performance electric machines are critical for heavy-duty vehicles (HDEV) to enable transportation electrification, where there is a significant gap between the traditional internal combustion engines and electrical machine technology. Winding topologies in design of machines, developments which widely reported other applications such as automotives, but rarely studied HDEV applications. This paper will provide detailed review assess both used novel winding characteristics HDEV. Using...