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2016 International Conference on Electrical Systems for Aircraft, Railway, Ship Propulsion and Road Vehicles & International Transportation Electrification Conference (ESARS-ITEC)
Spring stiffness is the key parameter of an active suspension consisting of an actuator and a mechanical spring. The effects of the spring stiffness on suspension performances are investigated comprehensively. A novel multi-objective optimization technique of the spring stiffness in automotive active suspension systems is developed in this study. The novel optimization objective is proposed as the...
In electrical drive applications based on induction machines, such as the propulsion drive of an electric vehicle, the rotor currents cannot be measured, so it needs to be estimated. This paper describes the rotor currents estimation through reduced order estimator known as Kalman filter to apply a speed-sensorless control of dual three-phase induction machines by applying a current inner loop based...
The TeDP concept has been presented as a possible solution to reduce aircraft emissions despite the continuing trend for increased air traffic. However, much of the benefit of this concept hinges on the reliable transfer of electrical power from the generators to the electrical motor driven propulsors. Protection and fault management of the electrical transmission and distribution network is crucial...
The layout of power modules is one of the key points in power module design, especially for high power densities, where couplings are increased. Stray inductances cause various problems in switching devices and should be minimized at an early design stage to avoid later required countermeasures and redesign after the device prototype has been built. In this paper, using Ansys® Q3D® Extractor, electromagnetic...
Powertrain design is all about finding compromises between the different components. This is a multidisciplinary task that requires a good knowledge of the factors driving the cost and size of the components and how they interact with each other. For the exposed reason, this work firstly presents a methodology to estimate the size and cost of power electronics converters, electrical machines and mechanical...
All Electric Ships (AESs) are becoming a standard for what it concerns large ships with large power requirements (for both propulsion and onboard loads). At present, the design of shipboard complex power system (namely the IPS — Integrated Power System) is done through a well-proven process, relying on historical data and trial-and-error procedures developed in nearly 30 years of design experience...
The Ohio State University Buckeye Current is a student team formed in 2010 to provide practical experience in designing and building electric motorcycles, and to compete in national and international races. The mission of the team is to teach students about electric vehicles, promote electric vehicle events, and give students an engaging educational work environment through real-world experiences...
The most recent GreenTeam race car, the E0711-7, has been designed and built to set a new level of high performance race cars made by GreenTeam. This paper investigates the E0711-7's high performance powertrain design process, powertrain structure and the unique oil-cooled battery pack. Experimental results from test bench measurements and race data have been reported to illustrate the powertrain...
In this paper, an electric naval propulsion system based with a Doubly Fed Induction Machine and two Voltage Source Inverters is proposed. So, in this propeller motor architecture the DFIM is fed by Stator and Rotor Voltage Source Inverters (VSIs). To produce more efficient and environmentally-friendly ships, a certain number of new concepts have been developed. So, the main idea of this study is...
It makes no doubt in most people's mind that future transportation will become more and more electrical. However the penetration rate of electrification will greatly depend not only on the performance of the system — autonomy being one of the most critical aspects — but also on cost and system reliability. In this paper, a novel system approach for driving 3 phase inverters power stages will be presented...
An electric vehicle (EV) energy management system concept is proposed in this work. Its goal is to prevent power outage in residences and delivery/receive energy to/from the utility grid, in case of local grid disturbances. Unlike the vehicle-to-home (V2H) systems known in the literature, the power system does not require structural changes in a typical home EV battery charging system. Such system...
Currently, lithium batteries are characterized by higher energy density but they require an accurate charge and discharge profile to increase its lifetime, and it is not easily to be obtained feeding urban railway systems. On the other hand, supercapacitors are powerful components, which can deliver very high power pulse for both traction and braking phases. The hybridization of these energy storage...
This paper presents an analytical modelling approach for Switched Reluctance Machines (SRMs) with a wide saturation range. There are many existing analytical modelling approaches in literature that give good accuracy, however most do not consider modelling accuracy in the deeply saturated region of operation. The proposed modelling method is suitable for SRMs operating under the entire saturation...
The paper presents the design and measurements for very high frequency, low power, inductive DC-DC converters (100 MHz, 3.3V input voltage, 350mW output power). A 3-stage cascode power stage in 40nm CMOS technology is demonstrated at high switching frequency but satisfying efficiency. Particularly it is shown that 2.5D heterogeneous integration brings significant benefits to cut losses thanks to a...
The maximum transmissible electrical power concept is applied to different electrical railway systems. Different problems arise depending on whether the electrical system is using DC or AC system. A DC example illustrates how the power line loadability can be assessed. Afterwards, the definition is extended to AC system to take into account the effect of the reactive power. Finally, an AC use case...
This paper deals with rare-earth-free permanent magnet traction machine design for C-segment electric vehicle (EV). Four different ferrite permanent magnet synchronous machine topologies having different magnets arrangement and pole-pair number, selected for their high potential, are presented and compared thanks to a computationally efficient finite-element based analysis tool that was developed...
This paper focuses on the methodology to apply the Dynamic Programming (DP) to the optimal operation control of trains with onboard Lithium-ion batteries in order to accumulate knowledge of energy-efficient driving technique. In this methodology, the energy-efficient driving control is formulated as an optimal control problem with two-point boundary conditions. We propose the model to consider the...
This paper presents an evaluation of the performance improvements of using hybrid IGBT modules; Silicon (Si) IGBT and Silicon Carbide (SiC) Diode, in an 225kW dc-dc converter for an electrical storage based light rail vehicle (tramway). First an experimental characterization of the conventional and hybrid IGBT modules is carried out. Second, based in this characterization, the power loss reduction...
This literature review presents a summary of recent research about PM-less machines for electrical vehicles. Recently, IPM machines has proven to be very popular among electrical vehicle manufacturers. However, the neodymium permanent magnets being used are expensive and have a risk of rocketing the production cost of a machine if the price increases more. With this in mind, five PM-less machine topologies...
In order to democratize electric vehicles, automakers have to give a solution to reduce the total cost of ownership and bring it better than thermal vehicles one. This paper presents results of works on costs improvement of a 3.5t light-duty commercial electric vehicle. TCO (Total Cost of Ownership) were separated into investment costs and operating costs. The batteries of an electric vehicle were...
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