Axial-Flux Motor System Efficiency in a Solar Powered Vehicle

2005 ◽  
Author(s):  
Scott Hammack ◽  
Dale Schinstock
Keyword(s):  
Motor System ◽  
High Efficiency ◽  
Mechanical Energy ◽  
Electrical Energy ◽  
Air Gap ◽  
System Efficiency ◽  
Direct Drive ◽  
Axial Flux ◽  
Solar Powered ◽  
Motor Operation

This paper presents a study of maximizing motor system efficiency for a solar powered vehicle by providing guidelines for the setup and operation of the motor system. It describes the vehicle, the motor system, and the dynamometer used for testing. Solar racecars use the axial flux motor described in the work because of its high efficiency, direct drive feature, and lead screw driven variable air gap. We present efficiency test results at a range of operating points. Motor operation in drive and regeneration modes is covered. During regeneration mode testing, the axial flux motor system converts mechanical energy provided by the dynamometer to electrical energy. In drive mode, the dynamometer absorbs the mechanical energy produced by the axial flux motor. The parameters varied in studying motor efficiency are battery voltage, speed, torque, and air gap size. Regeneration efficiency as influenced by back EMF is discussed. Guidelines for motor operation are developed. For example, guidelines for setting the motor air gap as a function of speed are given. The users of solar powered vehicles can employ these guidelines to setup and operate the motor more efficiently through improved regenerative energy capture and decreased drive losses. Application of the guidelines may be extended to other electric and hybrid vehicles, thus improving automotive energy efficiency.

scholarly journals The Use Of Microturbines as an Energy Converter For Motor Transport

2019 ◽  
Vol 8 (10) ◽  
pp. 2700-2703
Keyword(s):  
Fuel Consumption ◽  
High Speed ◽  
Internal Combustion Engines ◽  
High Efficiency ◽  
Mechanical Energy ◽  
Electrical Energy ◽  
Motor Vehicles ◽  
Turbine Engine ◽  
Range Extender ◽  
Traction Motors

At this stage of the development of vehicles with a combined power plant, one of the areas of development is the study of the introduction of a low-power gas turbine engine, the so-called microturbine, as a converter of thermal energy into mechanical. This solution has numerous positive aspects related to its fuel consumption, small dimensions, high efficiency, as well as a number of performance indicators. In this case, the vehicle is also equipped with a high-speed generator with the goal of converting the mechanical energy of the microturbine into electrical energy. This ensures the microturbine operation in a given range on the characteristic of optimal fuel consumption. The article contains an analysis of the use of microturbine generators in vehicles; some constructive solutions are considered as well. An overview of vehicles with microturbine generators and their comparison with traditional internal combustion engines is given. The movement of the vehicle is carried out by one or several traction motors. More than ten developments of motor vehicles using the microturbine as an additional source of energy for vehicles with traction electric drive are already known in the world, including MiTRE (Microturbine Range Extender). Among such vehicles, one can name the Trolza "Ecobus" buses, Delta Hypercar supercar, Isuzu NPR trucks, Mack Truck, Kenworth.

scholarly journals A REVIEW OF DUAL-MOTOR SYSTEM AND METHODS FOR CHARGING BATTERIES OF AN E-VEHICLE

2021 ◽  
pp. 124-126
Author(s):  
Lokesh M. Giripunje ◽  
Vipul Kumar Singh ◽  
Govind Suryakant Kendre
Keyword(s):  
Motor System ◽  
Mechanical Energy ◽  
Electrical Energy ◽  
Electrical Signals ◽  
Electric Cars ◽  
Charging System

The use of electric cars has the potential to reduce transportation-related pollution. Their adoption has been hampered by the lack of and/or high cost of charging facilities. As a result, small on-board chargers are often used as the main charging system in cars. We know that batteries can be charged in two ways: conductive and inductive. Here we are proposing a dual motor based charging. We know that when we power a motor with electricity, the electrical energy is converted into mechanical energy and vice versa. Here we are using rear motors for the movement of our car. This movement is used by front motors for producing electrical signals again

scholarly journals Rancang Bangun Modul Pembelajaran Bengkel Listrik (Designing Electric Workshop Learning Modules)

2019 ◽  
Vol 3 (1) ◽  
pp. 1
Author(s):  
Sonong Sonong ◽  
Herman Nauwir ◽  
Muhammad Ruswandi Djalal
Keyword(s):  
Induction Motor ◽  
Electric Motor ◽  
Motor Performance ◽  
Mechanical Energy ◽  
Electrical Energy ◽  
Electric Machine ◽  
Protection System ◽  
Electric Motors ◽  
Learning Modules ◽  
Motor Operation

Electric motor is an electric machine that has a function as a converter of electrical energy into mechanical energy. Electric motors are widely used as movers because they are better in terms of technical and economical, but have disadvantages such as large initial currents so that they cannot last long, to overcome this can be used Y-utan star starting method both manually and automatically created in a panel box. In the operation and manufacture of a protection system for a 3 phase induction motor, some supporting equipment can be arranged in a panel box so that motor performance can be maximized. The results of this tool design are in the form of a panel box in which there are three types of circuits, namely: 3 phase induction motor operation circuit with the starting Y-∆ automatically, reversing the direction of 3 phase induction motor rotation, and 3 phase induction motor operation in two places. Where the series is equipped with a protection system and can be operated manually and automatically.

scholarly journals Electromagnetic Loss Analysis of a Linear Motor System Designed for a Free-Piston Engine Generator

Electronics ◽  
2020 ◽  
Vol 9 (4) ◽  
pp. 621 ◽  
Author(s):  
Yunqin Hu ◽  
Zhaoping Xu ◽  
Lijie Yang ◽  
Liang Liu
Keyword(s):  
Motor System ◽  
Pulse Width Modulation ◽  
High Efficiency ◽  
Electrical Energy ◽  
Element Model ◽  
Energy Conversion Efficiency ◽  
Linear Motor ◽  
Piston Engine ◽  
Free Piston ◽  
Free Piston Engine

A free-piston engine generator is a new type of power generating device, which has the advantages of high efficiency and simple structure. In this paper, a linear motor system composed of a moving-coil linear motor with axial magnetized magnets and a H-bridge pulse-width modulation (PWM) rectifier is designed for portable free-piston engine generators. Based on the finite-element model of the motor and physical model of the rectifier, the combined electromagnetic model is presented and then validated by the prototype-tested results. The electromagnetic processes of the linear motor system are simulated. The electromagnetic losses during the standard working cycle are analyzed. Under the rated reciprocating frequency of 50 Hz and the rated reciprocating stroke of 36 mm, the mechanical-to-electrical energy conversion efficiency of 86.3% can be obtained by the linear motor system, which meets the requirement of portable free-piston engine generators.

scholarly journals Effect of Slot Opening Width on the Air-Gap Magnetic Field of a Direct Drive Permanent Magnet Motor

2019 ◽  
Vol 9 (21) ◽  
pp. 4649
Author(s):  
Yaofei Han ◽  
Shaofeng Chen ◽  
Caixia Gao ◽  
Mengzhen Gao ◽  
Jikai Si ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Finite Element ◽  
Permanent Magnet ◽  
High Efficiency ◽  
Air Gap ◽  
Direct Drive ◽  
Permanent Magnet Motor ◽  
Slot Opening ◽  
Air Gap Magnetic Field ◽  
Opening Width

The direct drive permanent magnet motor (DDPMM) is a promising candidate for applications because of its high efficiency, high power density, and low maintenance costs. This study focused on the effect of slot opening width on the air-gap magnetic field of a DDPMM. An exact analytical model based on Fourier analysis was established to calculate the air-gap magnetic field. The analytical general solution of the air-gap magnetic field shows that the slot opening greatly affects the air-gap magnetic field distribution when the amount of the permanent magnet is constant. Then, the air-gap magnetic fields of the DDPMM with closed and open slots were compared at different positions. Furthermore, several finite-element models of motors composed of different numbers of unit motor were established based on the different slot opening widths to study the effect of slot opening width on the air-gap magnetic field. The results obtained using the finite element method verify that the slot opening width greatly affects the air-gap magnetic field.

scholarly journals Coupling Supercapacitors and Aeroacoustic Energy Harvesting for Autonomous Wireless Sensing in Aeronautics Applications

2016 ◽  
Vol 3 (4) ◽  
Author(s):  
Romain Monthéard ◽  
Marise Bafleur ◽  
Vincent Boitier ◽  
Xavier Dollat ◽  
Nicolas Nolhier ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
High Efficiency ◽  
Mechanical Energy ◽  
Electrical Energy ◽  
Wireless Sensor Node ◽  
Interface Circuit ◽  
Aeroacoustic Noise ◽  
Ac Power ◽  
Self Powered ◽  
First Time

AbstractThis paper reports for the first time the experimental demonstration of a wireless sensor node only powered by an aeroacoustic energy-harvesting device, meant to be installed on an aircraft outside skin. Aeroacoustic noise is generated on purpose to serve as a means of converting mechanical energy from high velocity airflow into electrical energy. Results related to the physical characterization of the energy conversion process are presented. The proposed aeroacoustic transducer prototype, consisting in a rectangular cavity fitted with a piezoelectric membrane, is shown to deliver up to 2 mW AC power under Mach 0.5 airflow. Optimized power management electronics has been designed to interface with the transducer, including a self-powered Synchronized Switch Harvesting on Inductor (SSHI) interface circuit and an efficient buck-boost DC/DC converter. The design of micropower auxiliary circuits adds functionality while preserving high efficiency. This circuit stores energy in supercapacitors and is able to deliver a net output DC power close to 1 mW. A fully autonomous system has been implemented and tested, successfully demonstrating aeroacoustic power generation by supplying a battery-free wireless datalogger in conditions representative of an actual flight.

Reduction of structural vibrations with the piezoelectric stacks ring

2020 ◽  
Vol 64 (1-4) ◽  
pp. 729-736
Author(s):  
Jincheng He ◽  
Xing Tan ◽  
Wang Tao ◽  
Xinhai Wu ◽  
Huan He ◽  
...  
Keyword(s):  
Vibration Control ◽  
Mechanical Energy ◽  
Electrical Energy ◽  
Structural Vibrations ◽  
Rotor Systems ◽  
Fea Model ◽  
Piezoelectric Stacks ◽  
Shunt Damping ◽  
Reduction Effect ◽  
Euler Bernoulli Beam

It is known that piezoelectric material shunted with external circuits can convert mechanical energy to electrical energy, which is so called piezoelectric shunt damping technology. In this paper, a piezoelectric stacks ring (PSR) is designed for vibration control of beams and rotor systems. A relative simple electromechanical model of an Euler Bernoulli beam supported by two piezoelectric stacks shunted with resonant RL circuits is established. The equation of motion of such simplified system has been derived using Hamilton’s principle. A more realistic FEA model is developed. The numerical analysis is carried out using COMSOL® and the simulation results show a significant reduction of vibration amplitude at the specific natural frequencies. Using finite element method, the influence of circuit parameters on lateral vibration control is discussed. A preliminary experiment of a prototype PSR verifies the PSR’s vibration reduction effect.

Vector field path following of a full-wing solar-powered Unmanned Aerial Vehicle (UAV) landing based on Dubins path: a lesson from multiple landing failures

2021 ◽  
pp. 1-30
Author(s):  
A. Guo ◽  
Z. Zhou ◽  
R. Wang ◽  
X. Zhao ◽  
X. Zhu
Keyword(s):  
Vector Field ◽  
Path Following ◽  
Endurance Performance ◽  
Electrical Energy ◽  
Lateral Control ◽  
Special Configuration ◽  
Straight Line ◽  
Lateral Distance ◽  
Solar Powered ◽  
Line Path

Abstract The full-wing solar-powered UAV has a large aspect ratio, special configuration, and excellent aerodynamic performance. This UAV converts solar energy into electrical energy for level flight and storage to improve endurance performance. The UAV only uses a differential throttle for lateral control, and the insufficient control capability during crosswind landing results in a large lateral distance bias and leads to multiple landing failures. This paper analyzes 11 landing failures and finds that a large lateral distance bias at the beginning of the approach and the coupling of base and differential throttle control is the main reason for multiple landing failures. To improve the landing performance, a heading angle-based vector field (VF) method is applied to the straight-line and orbit paths following and two novel 3D Dubins landing paths are proposed to reduce the initial lateral control bias. The results show that the straight-line path simulation exhibits similar phenomenon with the practical failure; the single helical path has the highest lateral control accuracy; the left-arc to left-arc (L-L) path avoids the saturation of the differential throttle; and both paths effectively improve the probability of successful landing.

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