Adopting the Topology Optimization in the Design of High-Speed Synchronous Reluctance Motors for Electric Vehicles

High driving efficiency remains challenging in autonomous electric vehicles, especially in small electric vehicle subtype. Here, we reported investigation of the structure and requirements of the drive system for those vehicles, while the motor-drive axle combined integrated driving scheme has been chosen. In the study, the power matching of drive motor as well as transmission ratio has been calculated based on the performance of the small electric vehicles, and the total gear ratio of 8.124 was determined. For better comprehensive performance and efficiency, the two-stage retarder has been designed, in which elements including high-speed shaft, low-speed shaft, gears, and differential have been examined to ensure their proof strength when the motor outputs reached the maximum torque. Notably, by utilizing topology optimization, Gear 4, the transmission unit with the heaviest weight percentage has been modified in a lightweight way, achieving a 41% reduction of the mass in emulation analysis and turned up to the target of optimization eventually.

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Getriebeakustik von Elektrofahrzeugen*/Gearbox acoustic for electric vehicles - Investigation of the effects of wobble, concentricity and pitch error in high-speed-applications

wt Werkstattstechnik online ◽

10.37544/1436-4980-2017-05-30 ◽

2017 ◽

Vol 107 (05) ◽

pp. 334-339

Author(s):

C. Prof. Brecher ◽

C. Löpenhaus ◽

M. Ahmad

Keyword(s):

Design Process ◽

Electric Vehicles ◽

High Speed ◽

Pitch Error ◽

Decisive Influence

Der Einfluss fertigungs- sowie montagebedingter Abweichungen über dem Umfang auf das Anregungsverhalten, zum Beispiel Teilungs- oder Rundlaufabweichungen, bleibt im Auslegungsprozess konventioneller Getriebe weitestgehend unberücksichtigt. Diese über den Umfang veränderliche Kontaktgeometrie hat einen enormen Einfluss auf die Anregung der Drehordnungen bei schnelllaufenden Getrieben in Elektrofahrzeugen. Die Wichtigkeit der Betrachtung dieser Abweichungen werden in einer Simulationsstudie untersucht.   The influence of manufacturing- and assembly-related deviations are largely ignored in the design process of the excitation behavior of conventional transmissions. Effects of the deviation of tooth contacts over one revolution have a decisive influence on the excitation of the rotational order in gearboxes of electric vehicles. This report investigates in simulation the effects of these deviations on the excitation behavior considering high-speed-application.

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Multi-Objective Topological Optimization of Support Frame for High-Speed and Heavy-Load Triangle Track Wheel Based on Analytic Hierarchy Process

Volume 3: 20th International Conference on Advanced Vehicle Technologies; 15th International Conference on Design Education ◽

10.1115/detc2018-85124 ◽

2018 ◽

Author(s):

Fenghe Wu ◽

Zhaohua Wang ◽

Yinxu Sun ◽

Yulin Yang ◽

Yongxin Li ◽

...

Keyword(s):

Topology Optimization ◽

High Speed ◽

Working Condition ◽

Average Frequency ◽

Frequency Method ◽

Analytic Hierarchy ◽

Heavy Load ◽

Multi Objective ◽

Support Frame ◽

Hierarchy Process

The high-speed, heavy-load and changeable triangle track wheel is a motion device that can carry out interchange between the track wheel and tire in an ordinary vehicle. The topology optimization for the support frame can reduce weight and improve the maneuverability of the vehicle. However, it is difficult to consider simultaneously its weight, stiffness and modal in the process of the structure optimization. Thus, a topology optimization method for multi-objective and multi-working-condition is proposed based on the AHP (analytic hierarchy process) and average frequency method. Firstly, considering the static multi-stiffness target and dynamic vibration frequency target, using the compromise programming method and average frequency method, the objective function of the multi-objective and multi-working-condition topology optimization is established. Then, based on the optimization target, design criteria and indexes, the lightweight hierarchical structure model of the support frame consisting of three levels and eight weight factors is established. Values of 8 weight coefficients of the multi-objective topology optimization are determined through solving the weight factor judgment matrix. Finally, considering the multi-working-condition, taking the minimum objective function of the static and dynamic characteristics as target, and the volume ratio is 50% as boundary, the mathematical model of the topology optimization is established. Simulation results show that the stiffness and strength of the support frame are improved respectively by 74.3% and 1.3% while its weight is reduced by 16.3%. This method also provides a new way to the lightweight design for other large, heavy and multi-condition equipment.

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Prototype production and comparative analysis of high-speed flywheel energy storage systems during regenerative braking in hybrid and electric vehicles

Journal of Energy Storage ◽

10.1016/j.est.2021.103237 ◽

2021 ◽

Vol 43 ◽

pp. 103237

Author(s):

Koray Erhan ◽

Engin Özdemir

Keyword(s):

Comparative Analysis ◽

Energy Storage ◽

Electric Vehicles ◽

High Speed ◽

Storage Systems ◽

Regenerative Braking ◽

Flywheel Energy Storage ◽

Energy Storage Systems

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Study on Lightweight of the Engine Piston Based on Topology Optimization

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.201-203.1308 ◽

2011 ◽

Vol 201-203 ◽

pp. 1308-1311 ◽

Cited By ~ 2

Author(s):

Fa Rong Du ◽

Zhi Tao

Keyword(s):

Topology Optimization ◽

High Speed ◽

Gasoline Engine ◽

Optimization Method ◽

Variable Density ◽

Complex Stress ◽

Density Topology ◽

Before And After ◽

Calculation Results ◽

Hyper Works

The topology optimization and analysis were studied on the area of piston pin boss for a high-speed gasoline engine based on the variable density topology optimization method. Firstly, the model of the variable density topology optimization was founded. Then, the topology optimization and topology deconstruction on the piston pin boss were carried out by using Hyper Works. In this process, the minimum mass of piston was pursued as an objective function and the displacements of specified nodes on the piston skirt were made as constraints. Based on the topology optimization, the piston configuration of curved rod frame was designed. The complex stress of the piston before and after optimization was calculated respectively by ANSYS. The calculation results indicate that the piston mass can be lightened by 30% through optimizing under the same level of maximal stress, with satisfying the strength requirements. Therefore, the aim of piston lightweight is achieved, and there is no stress concentration in the area of the optimizing piston pin boss, which is propitious to the deformation compatibility of the piston pin boss.

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Electric Vehicle Improved by Three-Phase Asynchronous Cooled Motor

ASME 2013 7th International Conference on Energy Sustainability ◽

10.1115/es2013-18167 ◽

2013 ◽

Author(s):

Giuseppe Rattighieri ◽

Michele Trancossi ◽

Nicola Dorigo Salomon ◽

Dean Vucinic

Keyword(s):

Electric Vehicle ◽

Electric Vehicles ◽

High Speed ◽

Rotation Speed ◽

Reggio Emilia ◽

Heavy Load ◽

Power Train ◽

Electric Car ◽

Three Phase ◽

Cabin Interior

This paper presents the EVITA electric car. EVITA is the acronym of Electric Vehicle Improved by Three-phase Asynchronous cooled motor. It is a research project developed jointly by RGEngineering and University of Modena and Reggio Emilia. It aims to produce a novel electric power train with the capability of solving three fundamental problems of today commercial electric vehicles: 1. direct torque dependency of the rotation speed, and its reduction at high speed regimes; 2. electric motors performances reduction due to the overheating effects under heavy load conditions; 3. acclimatization of the car cabin interior in winter times.

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SPWM Fed Induction Motor Drive Performance Using SIMULINK

10.46610/joares.2021.v07i02.005 ◽

2021 ◽

Vol 7 (2) ◽

Author(s):

Singampalli Hema ◽

Singampalli Hema

Keyword(s):

Induction Motor ◽

Electric Vehicles ◽

High Speed ◽

Fossil Fuels ◽

Pulse Width Modulation ◽

Power Ratio ◽

Dc Motors ◽

Speed Range ◽

Single Phase Inverter ◽

Ac Induction Motor

In the former times, IC engines were used for transportation by most of the vehicles. But due to the depletion of fossil fuels day to day, the world is moving towards the Electric Vehicles (EVs) to overcome this problem. Electric Vehicles have higher efficiency and weight/power ratio. In general, DC motors were used in electric vehicles. The DC motors could not meet the requirements of customer needs because of its low speed range. In the recent studies, an AC Induction motor has several advantages over DC motors because of its robustness, high speed range, and efficiency and weight/power ratio. This paper presents the performance analysis of AC Induction motor when fed with the Single-Phase Inverter. The gate pulses are given by using Sinusoidal Pulse Width Modulation (SPWM) technique. The results are then compared with the performance of DC motor using MATLAB/SIMULINK.

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