scholarly journals A Free-Standing Electromagnetic Energy Harvester for Condition Monitoring in Smart Grid

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Hao Wang ◽  
Guangyu Shi ◽  
Congzheng Han
Keyword(s):  
Magnetic Flux ◽  
Smart Grid ◽  
Power Density ◽  
Condition Monitoring ◽  
Open Circuit ◽  
Electromagnetic Energy ◽  
Soft Magnetic Materials ◽  
Magnetic Flux Density ◽  
Free Standing ◽  
Zn Ferrite

Wireless energy harvesting is an effective way to power condition monitoring sensors which are the basis of smart grid. In this paper, a new free-standing I-shaped core is designed to scavenge electromagnetic energy from large alternating current. An I-shaped core can guide more magnetic flux by adding a pair of magnetic flux collector plates at both ends of the rod core. It weakens the core demagnetization field and enables more energy to be collected. Since a magnetic field line can be bent with high-permeability soft magnetic materials, a highly efficient grid-shaped coil is proposed. Compared with the I-shaped coil, its weight is lighter and power density is higher. A Mn-Zn ferrite with high relative permeability and ultralow conductivity can effectively reduce eddy current loss, which proves to be the most suitable material. The measured open circuit voltage agrees well with the theoretical value. The experimental results show that the output power can reach 4.5 mW when the I-shaped coil is placed in a magnetic flux density of 6.5 μTrms. The power density is 7.28 μW/cm3. Therefore, the proposed design can be very effective for supplying condition monitoring sensors.

scholarly journals 2-D Analytical Model for Predicting Magnetic Flux Distribution in Slotless Single-sided Axial Flux Permanent-Magnet Synchronous Machines

2019 ◽  
Vol 11 (2) ◽  
pp. 97-105
Author(s):  
A. Ghaffari
Keyword(s):  
Magnetic Flux ◽  
Permanent Magnet ◽  
Flux Density ◽  
Analytical Model ◽  
Permanent Magnets ◽  
Open Circuit ◽  
Synchronous Machines ◽  
Magnetic Flux Density ◽  
Permanent Magnet Synchronous Machines ◽  
Axial Flux

This paper estimates the magnetic flux density components in the slotless single-sided axial flux permanent-magnet synchronous machines (SAFPMSMs). For this purpose, a 2-D analytical model based on the sub-domain method is utilized in which the cross-section of the presented machine is divided into the seven sub-regions such as stator side exterior, stator, winding, air-gap, permanent-magnets (PMs), mover and mover side exterior. Based on the Maxwell equations, the related partial differential equations (PDEs) of magnetic flux density components are formed in each sub-region which are identified as the essential step for obtaining the machines quantities. According to the superposition theorem, two separate steps are implemented for calculating the magnetic flux density components. In the first step, open circuit analysis includes various type of magnetization patterns, i.e. parallel, ideal Halbach, 2-segment Halbach and bar magnet in shifting direction is investigated and armature currents are zero and in the second step PMs are inactive and the magnetic flux density components are originated due to only armature reaction. Eventually, 2-D finite element method (FEM) is determined to confirm the accuracy of the presented analytical approach and an acceptable agreement between the analytical and FEM models can be observed.

scholarly journals New compensation ferrometer design

2018 ◽  
Vol 69 (6) ◽  
pp. 411-414
Author(s):  
Aleš Havránek ◽  
Ivan Zemánek
Keyword(s):  
Magnetic Flux ◽  
Full Advantage ◽  
Magnetic Materials ◽  
Flux Density ◽  
Soft Magnetic Materials ◽  
Magnetic Flux Density ◽  
Soft Magnetic ◽  
Magnetomotive Force ◽  
Ac Magnetization ◽  
Force Compensation

Abstract The compensation ferrometer is an instrument for the measurement of open specimen soft magnetic materials parameters at AC magnetization based on the magnetomotive force compensation method. New magnetizing process regulator that controls voltage induced in measuring winding (magnetic flux density waveform) and the voltage induced across Rogowski-Chattock potentiometer (compensation) was developed recently. This paper deals with a new compensation ferrometer design that allows taking the full advantage of the new regulator. New ferrometer based on STEMlab platform improves precision and speed of the measurement.

Computer Aided Design of New Type PMSM Based on ISAD

2014 ◽  
Vol 1044-1045 ◽  
pp. 914-917
Author(s):  
Hao Ming Zhang ◽  
Ying Hai Wang ◽  
Lian Soon Peh
Keyword(s):  
Magnetic Flux ◽  
Flux Density ◽  
Power Density ◽  
Computer Aided Design ◽  
Magnetic Flux Density ◽  
Element Analysis ◽  
High Efficient ◽  
New Type ◽  
Sinusoidal Magnetic Field ◽  
Aided Design

Integrated starter alternator damper (ISAD) system requires motor: high-efficient, high-power density, low-ripple torque. Halbach motor is a new type of PMSM: unique permanent magnet structure makes motor have a sinusoidal magnetic field, can increase magnetic flux density of air gap and decrease magnetic flux density of rotor, which could enhance the power density and efficiency of motor as well as reduce its size. Software of Halbach motor design is given, also with the finite element analysis software with ANSYS language. Experiment proves the advantage of Halbach motor in ISAD system.

Mn-Zn Ferrite TP4K Material with Low Power Loss at High Temperature

2013 ◽  
Vol 320 ◽  
pp. 119-122
Author(s):  
Bing Bing Xing ◽  
Min Nie ◽  
Qiang Zhang ◽  
Yin Chuan Li
Keyword(s):  
High Temperature ◽  
Magnetic Flux ◽  
Low Power ◽  
Flux Density ◽  
Power Loss ◽  
Room Temperature ◽  
Magnetic Flux Density ◽  
High Saturation ◽  
Zn Ferrite

The Mn-Zn ferrite TP4K material was prepared by traditional oxide method, which has high saturation magnetic flux density and low power loss at high temperature. The Bs of the TP4K material is 535mT at room temperature, 430mT at 100°C, 350mT at 140°C; At temperature T=140°C, the power loss is lower than 340 kW/m3, which was measured under the frequency f=100kHz, the magnetization B=200mT.

Research on expanding the range of reproduction of magnetic flux density of the DC field of the state primary standard GET12-2011

2020 ◽  
pp. 3-7
Author(s):  
Vladlen Ya. Shifrin ◽  
Denis I. Belyakov ◽  
Alexander E. Shilov ◽  
Denis D. Kosenko
Keyword(s):  
Magnetic Flux ◽  
Magnetic Induction ◽  
Frequency Conversion ◽  
Magnetic Measurements ◽  
Primary Standard ◽  
Uncertainty Budget ◽  
The State ◽  
State Primary Standard ◽  
Magnetic Flux Density ◽  
Constant Field

The results of works aimed at increasing the level of uniformity of measurements of the magnetic induction of a constant field – the basic value in the field of magnetic measurements. A set of equipment for reproducing a unit of magnetic induction of a constant field in the range of 1–25 mT was created and described. The inclusion of this complex in the State primary standard of units of magnetic induction, magnetic flux, magnetic moment and magnetic induction gradient GET 12-2011 will ensure the reproduction and direct transmission of the unit of permanent magnetic induction in the ranges of not only weak (10–3–1 mT), but medium (1–25 mT) and strong (0.025–1 T) magnetic fields. A quantum cesium magnetometer based on the resolved structure of cesium atoms was created to transmit the unit of magnetic induction to the region of medium fields. The procedure for calculating the frequency conversion coefficients to magnetic induction of the created quantum cesium magnetometer is described. The uncertainty budget for reproducing a unit of magnetic induction of a constant field using the created complex is estimated.

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