Surface effect of energy storage motor
This paper presents an analytical method for calculating rotor stresses of high-speed surface-mounted permanent magnet synchronous motors (SPMSMs) with segmented …
Rotor Stress Analysis of High-Speed Surface-Mounted ...
This paper presents an analytical method for calculating rotor stresses of high-speed surface-mounted permanent magnet synchronous motors (SPMSMs) with segmented …
Improved energy conversion efficiency of the ultrasonic motor with ...
Purpose This paper aims to investigate the effect of frictional materials and surface texture on the energy conversion efficiency and the mechanical output performance of the ultrasonic motor (USM). Design/methodology/approach A newly designed testing system was set up to measure the mechanical output performance of the USM. The influence of different …
Numerical analysis of a flywheel energy storage system for low …
FESS is gaining popularity lately due to its distinctive benefits, which include a long life cycle, high power density, minimal environmental impact and instantaneous high power density [6].Flywheel Kinetic Energy Recovery System (KERS) is a form of a mechanical hybrid system in which kinetic energy is stored in a spinning flywheel, this technology is being trialled …
Tuning the Surface Chemistry of MXene to Improve …
1 Introduction. Since their discovery in 2011, 2D transition metal carbides or carbonitrides (MXenes) [1, 2] became a focal point of nanomaterials, notably for electrochemical energy storage. [3-6] The general …
Surface Effects
In dealing with surface effects, it is customary to introduce a property known as the surface tension, σ, which is the force per unit length, and thus has the unit of J/m 2 (force/length ≡ N/m; N: J/m). The surface tension opposes expansion of a surface. Thus, in order for a surface to expand, work must be done against this opposing force.
Energy management control strategies for energy storage …
This article delivers a comprehensive overview of electric vehicle architectures, energy storage systems, and motor traction power. Subsequently, it emphasizes different charge equalization …
Efficiency analysis of underground pumped storage hydropower plants
Menendez et al. [26] already developed a 3D numerical model to investigate the effect of reservoir pressure on energy generation (turbine mode) in UPSH plants. For the present investigation, the model has been modified to analyze the operation in pumping mode in order to evaluate the effect of reservoir pressure on energy consumption.
Recent advancement in energy storage technologies and their ...
They also intend to effect the potential advancements in storage of energy by advancing energy sources. ... Multilayered structures may increase energy storage - Surface treatments are important for fine-tuning capacitance properties ... electrical to mechanical energy is converted with the help of an energy source such as a motor or generator ...
Efficiency surface of the air motor | Download Scientific Diagram
As an important part of a micro-compressed air energy storage system, the scroll expander directly affects the efficiency of the whole energy storage system. The effects of resistance on the ...
Comprehensive review of energy storage systems technologies, …
Super-capacitor energy storage, battery energy storage, and flywheel energy storage have the advantages of strong climbing ability, flexible power output, fast response …
Multi-Objective Optimal Design of High-Speed Surface-Mounted …
This paper presents a multi-objective optimized design for a 75 kW, 24 000 r/min high-speed surface-mounted permanent magnet synchronous motor (SMPSM) for a …
Dynamic characteristics analysis of energy storage flywheel motor …
The air-gap eccentricity of motor rotor is a common fault of flywheel energy storage devices. Consequently, this paper takes a high-power energy storage flywheel rotor system as the research object, aiming to thoroughly study the flywheel rotor''s dynamic response characteristics when the induction motor rotor has initial static eccentricity. Firstly, the formula …
Effects of functionalization on energy storage properties and …
Paraffin-based nanocomposites are widely used in the energy, microelectronics and aerospace industry as thermal energy storage materials due to their outstanding thermophysical properties. This paper investigates the effects of functionalization on thermal properties of graphene/n-octadecane nanocomposite during phase transition by using non …
Energy storage in the 21st century: A comprehensive review on …
Energy storage devices such as electrochemical capacitors, fuel cells, and batteries efficiently transform chemical energy into electrical energy. ... a reversible charge storage mechanism at the surface, and a higher power density. ... Significant effect of pore sizes on energy storage in nanoporous carbon supercapacitors. Chem. Eur. J., 24 ...
Role of MXene surface terminations in electrochemical energy storage…
Furthermore, terminations also affect energy storage properties. First-principles calculations have been used to analyze the mechanisms and predict the energy storage properties of MXenes on the atomic scale. ... The −O and −S terminations on the surface affect the density of states near the Fermi level, resulting in degraded capacitance. 4 ...
Surface modification of cathode materials for energy storage …
Supercapacitors are emerging as promising energy storage devices and the improvement in energy density, rate capability, and cycle life is important factors for the advancement in supercapacitor technology [183]. Usually, the surface of the active material plays an important role in the capacitance, while the bottom part contributes to the fast ...
Surface science methodology reveals relaxation and failure …
Long cycle life and high safety are required for energy storage devices (ESDs) in their large-scale applications. ... Surface effect of electrodes revealed by operando surface science methodology ...
Design and Analysis of Basic Model of High-speed Surface
This paper presents a design method of the basic model of high-speed surface-mounted permanent magnet synchronous motor (SPMSM) comprehensively considering the …
Electromagnetic design of high-speed permanent magnet synchronous motor ...
Upadhyay P, Mohan N. Design and FE analysis of surface mounted permanent magnet motor/generator for high-speed modular flywheel energy storage systems[C]//2009 IEEE Energy Conversion Congress and ...
Enhancement of dielectric breakdown strength and energy storage …
So, it suggestes that the enhancement of α b of the epoxy flattened PTFE film is attributed to the interface effect. As the pits on PTFE surface are filled with epoxy, the surface of the films becomes smooth and less charges accumulate at the interfaces between film surface and electrodes. ... Energy storage performance of the films at high ...
Overview of the motor-generator rotor cooling system in a …
Motor-generators (MGs) for converting electric energy into kinetic energy are the key components of flywheel energy storage systems (FESSs). However, the compact diameters, high-power design features of MGs, and vacuum operating settings of FESSs cause the MG rotor''s temperature to increase, leading typical cooling water jackets to fail in ...
Structural effects of asymmetric magnet shape on performance of …
This study proposes a novel surface permanent magnet synchronous motor (N-SPMSM) structure, which features asymmetric magnets attached to the rotor surface.
Rotor Stress Analysis of High-Speed Surface-Mounted ...
High-speed permanent magnet motors are widely used in centrifugal compressors, flywheel energy storage, and other fields. The rotors are subjected to huge centrifugal force when they rotate at high speed, the surface-mounted permanent magnet rotors with retaining sleeves are usually used to ensure the safety of the permanent magnets (PMs) …
Design and Optimization of a High Performance Yokeless and
In this paper, a 50 kW stator yokeless modular axial flux motor with strong overload capacity, wide operating speed range and high operating efficiency is designed for …
Surface amending effect of N-doped carbon-embedded NiO films …
However, to apply NiO films to practical EC energy-storage applications, a low CE value (20–40 cm 2 /C), slow switching speeds (8–15 s), and low specific capacitance (<180 F/g) remain as key factors to be addressed [16], [17].To overcome these limitations, it is important to facilitate the electrochemical activity and electrical conductivity of NiO films, as doing so will …
Best practices for electric motor storage—Protecting your investment
Good, readily-available records are essential for any motor storage program. One method is to attach a card like that in Figure 1 to each motor to document the storage dates, maintenance procedures completed, and the results of all …
Renewable Energy
A asc is the surface area of ASC. T 0 is the environmental temperature. m is the mass of air in the ASC. u is the specific internal energy of air. In Eq. ... The thermodynamic effect of thermal energy storage on compressed air energy storage system. Renewable Energy, 50 (2013), pp. 227-235.
Energy Storage Devices (Supercapacitors and Batteries)
Basically an ideal energy storage device must show a high level of energy with significant power density but in general compromise needs to be made in between the two and the device which provides the maximum energy at the most power discharge rates are acknowledged as better in terms of its electrical performance. ... Also the surface ...
Analysis of compression/expansion stage on compressed air energy ...
Compressed Air Energy Storage (CAES) technology has risen as a promising approach to effectively store renewable energy. ... and optimizations of the proposed combined cold and power system with integrated advanced adiabatic compressed air energy storage and double-effect compression-absorption refrigeration. Energy 283, 128474. doi:10. ...
Extraordinary pseudocapacitive energy storage triggered by …
Pseudocapacitive materials could enable high-performance electrochemical supercapacitors, but their practical capacitance and power density remain low. Here the authors show that in situ phase ...
Efficient energy conversion mechanism and energy storage
a 3D structure of RF-TENG-6.b RMS current, voltage, and power under different resistances.c Comparison of charging effects. Insets (i) and (ii) depict the circuit diagram and voltage curve of RF ...
Surface effect of electrodes revealed by operando surface …
Methodology Reveals Surface Effect in Charge Storage Electrodes") ... surface effect and surface science methodology in energy storage systems. More information: Chao Wang et al, Operando surface ...
Tuning the Surface Chemistry of MXene to Improve Energy Storage ...
1 Introduction. Since their discovery in 2011, 2D transition metal carbides or carbonitrides (MXenes) [1, 2] became a focal point of nanomaterials, notably for electrochemical energy storage. [3-6] The general formula of MXene is M n +1 X n T x (n = 1−3), where M represents an early transition metal, X is carbon and/or nitrogen, and T x stands for the …
(PDF) Operando surface science methodology reveals …
Surface and interface play critical roles in energy storage devices, calling for operando characterization techniques to probe the electrified surfaces/interfaces.
Electromagnetic Design of High-Power and High …
In this paper, for the application of a flywheel energy storage system, low-loss design and optimization of high-speed motor under multiple constraints are carried out to reduce the steady-state power consumption of …
Effects of dielectric thickness on energy storage properties of surface ...
The results matched the model of Forlani and Minnaja well, with regard to the volume effects. Because of their low-cost, easily fabrication, lead-free, enhanced breakdown strength and improved discharge energy density, surface modified BaTiO 3 multilayer ceramic capacitors can provide realistic solutions for high power energy storage applications.
Design and Analysis of a Unique Energy Storage Flywheel …
The flywheel energy storage system (FESS) [1] is a complex electromechanical device for storing and transferring mechanical energy to/from a flywheel (FW) rotor by an integrated motor/generator ...
Supercapacitors: The Innovation of Energy Storage
In addition to the accelerated development of standard and novel types of rechargeable batteries, for electricity storage purposes, more and more attention has recently been paid to supercapacitors as a qualitatively new type of capacitor. A large number of teams and laboratories around the world are working on the development of supercapacitors, while …
Power and Energy for the Lunar Surface
o Lunar/Mars surface systems (~ 2 kW to ≤ 10 kW modules) o Urban Air Mobility (120 kW to > 20 MW) Energy Storage • High specific energy (W·hr/kg) Regenerative Fuel Cells (RFC) to store and release both electrical & thermal energy o RFC specific energy 320 to 650 W·hr/kg depending on mission energy