With increased need for high power density, efficiency and temperature capabilities in aerospace automotive applications, integrated motor drives (IMD) offers a potential solution. However, close physical integration of the converter machine may also lead to an increase components temperature. This requires careful mechanical, structural thermal analysis; design IMD system. study reviews existing technologies their effects on The electronics position system its respective management concepts...

This paper proposes a novel solid rotor topology for an interior permanent magnet (IPM) machine, adopted in this case aircraft starter-generator design. The key challenge the design is to satisfy two operating conditions that are high torque at start and speed cruise. Conventional IPM topologies highly capable of extended field weakening found be limited due structural constraints associated with material. To adopt concept high-speed operation, it proposed constructed from semimagnetic...

This experimental study investigates the effect of blade phase angle on noise attenuation in two adjacent, electronically synchronized propellers. Acoustic measurements were performed an aeroacoustic wind tunnel with a distributed electric propulsion system that involved adjustment relative angles 2-bladed propellers between Δψ = 0° and 90°. Ranges advance ratios (J 0–0.73) investigated at fixed propeller rotation speed 5000 rpm. The investigation explored impact directivity frequency...

This paper investigates the effect of two soft magnetic materials on a high-speed machine design, namely, 6.5% silicon steel and cobalt-iron alloy. The design parameters performance as an aircraft starter-generator is analyzed. material properties which include B-H characteristics losses are obtained at different frequencies under experiment used to predict accurately. In investigation presented in this paper, it shown that machines designed with high core flux density has lower weight than...

An often-overlooked aspect during the development process of electrical machines is validity and accuracy machine material properties being used at design stage. Designers usually consider data provided by supplier, which are measured on in an unprocessed state. However, fact that machining processes required to produce finished product (e.g., stator core) can permanently vary very often neglected. This paper, therefore, deals with investigates effects such have overall performance. To do...

Electric and hybrid-electric aircraft propulsion are rapidly revolutionising mobility technologies. Air travel has become a major focus point with respect to reducing greenhouse gas emissions. The electrification of components can bring several benefits such as reduced mass, environmental impact, fuel consumption, increased reliability quicker failure resolution. Propulsion, actuation power generation the three key areas in more electric technologies, due increasing demand for power-dense,...

Non-oriented electrical steel (NOES) laminations are commonly used to manufacture the rotor and stator core of electric machines. To achieve high machine efficiencies, it is desirable for these NOES be able a saturation magnetisation whilst incurring minimal losses. It known that inappropriate machining could cause significant deterioration in their magnetic properties. However, mechanisms by which influences this less understood. This study investigates after four nonconventional methods:...

This study aims to identify the optimal combination of process variables for laser powder bed fusion (LPBF) electric motor (EM) cores using Fe–50Ni alloy. A thorough analysis mechanical and magnetic properties, with a focus on its dynamic performance within 50–500 Hz frequency range, is presented. Optimized parameters yielded relative densities above 99%. In as-built condition, high hardness (twice that conventionally processed alloy) ductility (>30% at rupture) were achieved. The samples...

This paper proposes and investigates an innovative methodology that can have a significant impact on the market potential of wound field, small-medium size synchronous generators (SGs). The technique proposed here is aimed at removing need for traditional stator skewing so commonly used in SGs to achieve acceptable values voltage total harmonic distortion. To do this, nonstandard damper cage configuration comprises modulation bars' positioning. An off-the-shelf, 400-kVA generator as...

In this article, the qualitative theoretical derivation, together with finite element analysis and experimental studies are presented to investigate unbalanced magnetic pull (UMP) as well rotor vibration characteristics. Differently from previous studies, study focuses on UMP/vibration not only under normal conventional radial eccentricity conditions but also for three‐dimensional (3D) hybrid static air‐gap (SAGE) cases which composed of both SAGE axial SAGE. The detailed UMP expressions...

For a continuous mode of operation, insulating material in an electrical machine is subject to constant thermal, electrical, mechanical and environmental stresses where thermal stress major cause gradual insulation deterioration, which leads ultimate winding failure. To guarantee satisfactory lifetime, machines are designed operate temperatures well below their class, results oversized design. Standard methods for lifetime evaluation based on accelerated aging tests that require several...

This paper presents a comparative design study on Permanent Magnet (PM) rotor topologies for high speed aircraft starter-generators. The application requirements associated with the starter and generator operation is highlighted. Different concepts are investigated whilst keeping both stator diameter consistent. In addition, core material, electrical magnetic constraints thermal structural limitations also kept consistent as basis comparison of different in this study. performance optimal...

This paper presents the steady-state analysis of a high power step-up DC-DC converter based three-phase dual active bridge (3DAB) for use as medium voltage (MV) collector offshore wind farms. An optimization procedure high-power frequency transformer is explained and moreover, design an optimal control phase shift angle verified through simulation. The comparisons with two scenarios are presented: 4MW converters conversion from low dc (LVDC) turbine output terminal to 40kV MVDC grid proposed...

This paper presents a comprehensive study on the variation laws of electromagnetic torque (EMT) under static air-gap eccentricity (SAGE) conditions in synchronous generators. Different from other studies, this focuses not only impact radial SAGE, but also effect axial and hybrid EMT fluctuation characteristics, i.e., we actually 3D rotor eccentricity. The theoretical analysis model is first set up to influence SAGE magnetomotive force (MFD) EMT. Then, finite element calculation experimental...

This article shares with the aerospace community a case study of turboprop mild hybridization using recently developed integrated drive system in University Nottingham, U.K., within ACHIEVE project under EU H2020 CleanSky 2 program (project No. 737814). The enables green taxiing aircraft while on ground its engine OFF and as an electrical generator when is air. entire designed to be able integrate power auxiliary gearbox (PAGB) aircraft. Some key features include high-speed permanent magnet...

Maximizing the power density as well efficiency are two of main critical aspects for engineers who designing electrical machines aerospace applications. Iron losses have a significant impact on total machine efficiency, thermal state and, eventually, final design. This becomes especially high-frequency machines. Thereby selection optimal stator material which allows minimizing weight and iron is very important. paper focuses comparison cobalt-iron alloy high-grade non-oriented silicon steel...

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 a novel approach to integrate the output filter inductor in permanent magnet synchronous motor (PMSM) drive system. The integrated is based on utilizing magnetics as inductance instead of introducing separate inductor. Thus, eliminating added losses and associated weight volume. vector controlled model, taking modulation switching effect account, has been developed using MATLAB/Simulink tool for proposed currents obtained from model are then injected into Finite Element...

With the development of electrification aircrafts, demand for electrical power is growing. In order to reconcile growing and lightweight requirement high density permanent magnet starter-generator (PMSG) systems are considered as a competitive solution. By analyzing requirements (SG) reviewing state-of-the-art fault tolerant (FT) machines, topology feasibility FT machines in safety-critical aerospace evaluated. As mature compromise candidates, dual three-phase tolerance varied slot/pole...

Permanent magnet synchronous machines provide many dramatic electromagnetic performances such as high efficiency and power density, which make them more competitive in aircraft electrification, whereas, designing a permanent starter–generator (PMSG), with given consideration to fault tolerance (FT), is significant challenge requires great effort. In this paper, comprehensive FT PMSG design process proposed applied systems of turboprops. Firstly, potential slot/pole combinations were selected...

Estimating the lifetime of enameled wires using conventional/standard test method requires a significant amount time that can endure up to thousands testing hours, which could considerably delay time-to-market new product. This paper presents approach estimates insulation wire, employed in electrical machines, curve fitting models whose computation is rapid and accurate. Three fit are adopted predict resistance double-coated magnet wire samples, with respect their aging time. The samples'...

This paper presents parametric design studies of the on-board Electrical Power System (EPS) for a distributed hybrid aircraft propulsion.The work methodology that has been adopted to develop physics-based models EPS components comprise electrical machines, power electronic converters, batteries, solid state circuit breakers and cables.The model is sizing tool can be used evaluate mass dimensions its main components.In addition, it determines thermal performance over six key flight stages...

Abstract To achieve the goals of substantial improvements in efficiency and emissions set by Flightpath 2050, fundamentally different concepts are required. As one most promising solutions, electrification aircraft primary propulsion is currently a prime focus research development. Unconventional sub-systems, mainly electrical power system, associated thermal management system transmission provide variety options for integration existing systems. Different combinations gas turbine...

Safety and reliability of electrical actuators are essential for success all electric more aircrafts (MEA). Torque limiters improve the electromechanical (EMA) by restricting amount force experienced actuator drive train components. If transmitted torque in shaft exceeds a limit, it gives way controlled manner. This protects from potential failure jamming. In this paper, different types existing investigated their suitability aerospace EMA application further integration within motor. They...