scholarly journals Optimization and Analysis of a High Power Density and Fault Tolerant Starter–Generator for Aircraft Application

Energies ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 113
Author(s):  
Bo Wang ◽  
Gaurang Vakil ◽  
Ye Liu ◽  
Tao Yang ◽  
Zhuoran Zhang ◽  
...  
Keyword(s):  
Fault Tolerance ◽  
Permanent Magnet ◽  
Power Density ◽  
High Power ◽  
High Efficiency ◽  
Great Effort ◽  
High Power Density ◽  
Element Analysis ◽  
Starter Generator ◽  
Aircraft Application

Permanent magnet synchronous machines provide many dramatic electromagnetic performances such as high efficiency and high power density, which make them more competitive in aircraft electrification, whereas, designing a permanent magnet starter–generator (PMSG), with given consideration to fault tolerance (FT), is a significant challenge and requires great effort. In this paper, a comprehensive FT PMSG design process is proposed which is applied to power systems of turboprops. Firstly, potential slot/pole combinations were selected based on winding factor, harmonic losses and manufacture issues. Then, pursuing high power density, a multiple objective optimization process was carried out to comprehensively rank performances. To meet a fault tolerance target, electrical, magnetic and thermal isolation topologies were investigated and compared, among which 18 slot/12 pole with dual three-phase was selected as the optimal one, with a power density of 7.9 kW/kg. Finally, a finite element analysis verified the performance in normal and post-fault scenarios. The candidate machine has merits concerning high power density and post-fault performance.

scholarly journals Modelling and analysis of vienna rectifier for more electric aircraft applications using wide band-gap materials

2021 ◽  
Vol 2120 (1) ◽  
pp. 012027
Author(s):  
Ling Jin Loong ◽  
Chockalingam Aravind Vaithilingam ◽  
Gowthamraj Rajendran ◽  
Venkatkumar Muneeswaran
Keyword(s):  
Power Density ◽  
High Power ◽  
High Efficiency ◽  
Wide Band ◽  
Wide Bandgap ◽  
High Power Density ◽  
Vienna Rectifier ◽  
Electric Aircraft ◽  
Aircraft Application ◽  
More Electric Aircraft

Abstract This paper presents a comprehensive study on the switching effects of wide bandgap devices and the importance of power electronics in an aircraft application. Silicon (Si), silicon carbide (SiC), and gallium nitride (GaN) are wide bandgap devices that act as a power electronic switch in the AC-DC converter for More Electric Aircraft (MEA) applications. Therefore, it is important to observe their converting efficiency to identify the most suitable wide bandgap device among three devices for AC-DC converters in aircraft applications to provide high efficiency and high-power density. In this study, the characteristics of Si, SIC, and GaN devices are simulated using PSIM software. Also, this paper presents the performance of the Vienna rectifier for aircraft application. The Vienna rectifier using Si, SiC, and GaN devices are simulated using PSIM software for aircraft application. GaN with Vienna rectifier provides better performance than Si and SiC devices for aircraft applications among the three devices. It gives high efficiency, high power density, low input current THD to meet IEEE-519 standard, and high-power factor at mains.

The Analyse of High-Power Density and High-Efficiency PMSM

2012 ◽  
Vol 516-517 ◽  
pp. 1651-1654
Author(s):  
Bing Yi Zhang ◽  
Sen Wang ◽  
Gui Hong Feng
Keyword(s):  
Optimal Design ◽  
Permanent Magnet ◽  
Power Density ◽  
High Power ◽  
High Efficiency ◽  
Permanent Magnet Synchronous Motor ◽  
Design Strategy ◽  
Synchronous Motor ◽  
Air Gap ◽  
High Power Density

This paper attempts to present an optimal design strategy and characteristics of high-power permanent magnet synchronous motor(PMSM). The structures of rotor lamination, calculation of Air-gap Length, how temperature influences the performance of the motor and the calculation of Xad、Xaq under the equivalent direct axis are presented.

Research of Halbach Array’s Influence on Permanent Magnet Synchronous Motor’s Performance

2014 ◽  
Vol 651-653 ◽  
pp. 808-811
Author(s):  
Hao Ming Zhang ◽  
Hong Li ◽  
Lian Soon Peh
Keyword(s):  
Permanent Magnet ◽  
Power Density ◽  
High Speed ◽  
High Efficiency ◽  
Air Gap ◽  
High Power Density ◽  
Permanent Magnet Motor ◽  
Element Analysis ◽  
Halbach Array ◽  
New Type

The present motors are required to high speed, high efficiency, high power density but low pulsating torque. Traditonal rare-earth permanent magnet motor shows its defect; Halbach Array is a new type of permanent magnet structure: magnet field presents unilateral with the sinusoidal distribution. The structure makes the magnetic density of motor’s air gap larger relatively while the magnetic density of rotor’s yoke smaller. And it can help to reduce the motor’s pulsating torque and its size, as well as to raise the power density of motor. The result of finite element analysis based on ANSYS shows that the above structure is able to decrease the mass of motor, to widen the width of air gap and obviously to improve the multi properties of motors.

scholarly journals Quantitative Comparisons of Six-Phase Outer-Rotor Permanent-Magnet Brushless Machines for Electric Vehicles

Energies ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 2141 ◽  
Author(s):  
Yuqing Yao ◽  
Chunhua Liu ◽  
Christopher H.T. Lee
Keyword(s):  
Permanent Magnet ◽  
Power Density ◽  
Electric Vehicles ◽  
High Power ◽  
High Efficiency ◽  
Torque Ripple ◽  
High Power Density ◽  
Torque Density ◽  
Outer Rotor ◽  
High Torque

Multiphase machines have some distinct merits, including the high power density, high torque density, high efficiency and low torque ripple, etc. which can be beneficial for many industrial applications. This paper presents four different types of six-phase outer-rotor permanent-magnet (PM) brushless machines for electric vehicles (EVs), which include the inserted PM (IPM) type, surface PM (SPM) type, PM flux-switching (PMFS) type, and PM vernier (PMV) type. First, the design criteria and operation principle are compared and discussed. Then, their key characteristics are addressed and analyzed by using the finite element method (FEM). The results show that the PMV type is quite suitable for the direct-drive application for EVs with its high torque density and efficiency. Also, the IPM type is suitable for the indirect-drive application for EVs with its high power density and efficiency.

scholarly journals Optimized design of a high-power-density PM-assisted synchronous reluctance machine with ferrite magnets for electric vehicles

2017 ◽  
Vol 66 (2) ◽  
pp. 279-293 ◽  
Author(s):  
Xiping Liu ◽  
Ya Li ◽  
Zhangqi Liu ◽  
Tao Ling ◽  
Zhenhua Luo
Keyword(s):  
Power Density ◽  
High Power ◽  
High Efficiency ◽  
Torque Ripple ◽  
Optimized Design ◽  
High Power Density ◽  
Element Analysis ◽  
Synchronous Reluctance Machine ◽  
Torque Density ◽  
Reluctance Machine

AbstractThis paper proposes a permanent magnet (PM)-assisted synchronous reluctance machine (PMASynRM) using ferrite magnets with the same power density as rareearth PM synchronous motors employed in Toyota Prius 2010. A suitable rotor structure for high torque density and high power density is discussed with respect to the demagnetization of ferrite magnets, mechanical strength and torque ripple. Some electromagnetic characteristics including torque, output power, loss and efficiency are calculated by 2-D finite element analysis (FEA). The analysis results show that a high power density and high efficiency of PMASynRM are obtained by using ferrite magnets.

scholarly journals Near-field thermophotovoltaics for efficient heat to electricity conversion at high power density

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Rohith Mittapally ◽  
Byungjun Lee ◽  
Linxiao Zhu ◽  
Amin Reihani ◽  
Ju Won Lim ◽  
...  
Keyword(s):  
Power Density ◽  
High Power ◽  
High Efficiency ◽  
Near Field ◽  
Electrical Power ◽  
Photovoltaic Cells ◽  
High Power Density ◽  
Pv Cell ◽  
Electrical Power Output ◽  
Power Densities

AbstractThermophotovoltaic approaches that take advantage of near-field evanescent modes are being actively explored due to their potential for high-power density and high-efficiency energy conversion. However, progress towards functional near-field thermophotovoltaic devices has been limited by challenges in creating thermally robust planar emitters and photovoltaic cells designed for near-field thermal radiation. Here, we demonstrate record power densities of ~5 kW/m2 at an efficiency of 6.8%, where the efficiency of the system is defined as the ratio of the electrical power output of the PV cell to the radiative heat transfer from the emitter to the PV cell. This was accomplished by developing novel emitter devices that can sustain temperatures as high as 1270 K and positioning them into the near-field (<100 nm) of custom-fabricated InGaAs-based thin film photovoltaic cells. In addition to demonstrating efficient heat-to-electricity conversion at high power density, we report the performance of thermophotovoltaic devices across a range of emitter temperatures (~800 K–1270 K) and gap sizes (70 nm–7 µm). The methods and insights achieved in this work represent a critical step towards understanding the fundamental principles of harvesting thermal energy in the near-field.

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