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Abstract Topic: Electromagnetic Methods

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Analysis of the Surface Distribution of Graphite Mineral Deposits in Metamorphic Rocks Using the Geoelectric Method in Kolaka District, Kolaka Regency
La Hamimu (a*), L.O Ngkoimani (b), S. Asfar (b), Jahidin (a), M.A Sam (a), A. Okto (b)

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Corresponding Author
Suryawan Asfar

Institutions
a) Geophysics Department, Halu Oleo University, Campus Bumi Thridharma Anduonohu, Kendari City, Phone (0401)3191929, Fax (0401)3190496
b) Geology Department, Halu Oleo University, Campus Bumi Thridharma Anduonohu, Kendari City, Phone (0401)3191929, Fax (0401)3190496

Abstract
Abstract. This research activity was conducted in Watuliandu Village, Kolaka District, Kolaka Regency. The purpose of this research activity is to determine the resistivity and subsurface distribution of graphite mineral deposits on metamorphic rocks using the resistivity method with a configuration of Wenner-Schlumberger. Data retrieval is done as many as 3 (three) line measurements. The results of this study show 2D subsurface cross-sections represented by variations in the resistivity values. Broadly speaking, in each track graphite minerals are found that are associated with schist rocks with resistivity range values of 18.3-114 Ωm.

Keywords
Watuliandu Village, Graphite, Geoelectrical Method, Wenner-schlumberger

Topic
Electromagnetic Methods

Link: https://ifory.id/abstract/aVyv8HXDRh9m


Application of Empirical Mode Decomposition (EMD) Filtering at Magnetotelluric Time-Series Data
Nugroho Syarif Setiawan[1], Amien Widodo[1], Wien Lestari[1], Firman Syaifuddin[1], Ahmad Zarkasyi[2], Dwa Desa Warnana[1] and Djuan Pandu Gya Nur Rochman[1]

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Corresponding Author
Nugroho Syarif Setiawan

Institutions
[1] Institut Teknologi Sepuluh Nopember
[2] Pusat Sumber Daya Mineral, Batubara dan panas Bumi

Abstract
Noise that recorded at magnetoelluric data acquisition make the recorded data quality not good enough so the information that obtained after data processing might be not correct or not suit with the subsurface condition. Several characters that we can see at the noisy magnetotelluric data are the spiky shaped and non-stationarity time-series curve. This non-stationarity character can-t be handled by Fourier Transformation process. In this research used Empirical Mode Decomposition (EMD) method in original of Huang as filtering method in order to overcome the non-stationarity. This method decomposed the signal into group of oscillation mode called Intrinsic Mode Decomposition (IMF). One of the best IMF chosen as the filtering result by spectrum analysis in frequency domain. From the filtering result obtained that the time-series curve getting smoother and the non-stationarity character compressed. From this research concluded that EMD filtering can be implemented at magnetotelluric data processing and can emphasized the effect caused by noise.

Keywords
Empirical Mode Decomposition (EMD), Intrinsic Mode Function (IMF), Magnetotelluric

Topic
Electromagnetic Methods

Link: https://ifory.id/abstract/HRYm2xhT6MnB


Detection Of Seepage Source Path Location In Selorejo Downstream Foothill Earth Dam Using GPR
Yoyok Adisetio Laksono (a*), Siti Zulaikah (a), Sutrisno (a), Zulkifli Yusop (b), Daeng Ahmad Suaidi (a), Abdulloh Fuad (a), Moch Bagas Setya Rahman (a), Qorny Faren Anggana (a)

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Corresponding Author
Yoyok Laksono

Institutions
a) Department of Physics, Universitas Negeri Malang
*yoyok.adisetio.fmipa[at]um.ac.id
b) Centre for Environmental Sustainability & Water Security (IPASA), Faculty of Civil Engineering, Universiti Teknologi Malaysia

Abstract
It is found the seepage at wall canal at downstream foothill in Selorejo dam. It is indication there is the water leakage from dam. To get better understanding the path of leakage water, some locations of dam have been scanned using 90 MHz GPR (Ground Penetrating Radar). The location of scanned have been done at three locations, i.e. at (1) the top, (2) two third and (3) the downstream foothill dam using profiling and common midpoint technique. At first all of location are scanned using profiling technique, if at some location the structure of soil doesn-t look clearly, the common midpoint technique is using. The methods of analysis are gain profile, bandpass filter, and average subtraction to see the radargram clearly and hodograph to show the structure of soil from radargram scanned by common midpoint technique. At the top of dam the pattern is heavily attenuated because the material at this location is dominated by clay. After applied using three methods processing in order to see the structure clearly, there are two location shows soil saturated by water. In this location the common midpoint is use to scan at 20 m and 44 m. From godograph processing at those locations it is found clay layer saturated by water started from between 4-6 meter depth. At the two third dam it is found two locations significantly show soil saturated by water even without processing. The one of pattern have 16 m wide and the other one is about 8 m. At downstream foothill there are scattered location having small patterns saturated by water. From above of data it concluded that there are two path of seepage started from the top dam. This path shows clearly at the two third highest dam and this path is unified along before downstream foothill location.

Keywords
Detection; GPR; Seepage path; Downstream foothill; earth dam; Selorejo

Topic
Electromagnetic Methods

Link: https://ifory.id/abstract/uBzGVFc4hetd


Embedded Coreless Generator Effect on Thrust and Power Consumption of Brushless Motor
Samsul Hidayat 1), Fatchur Rahman 2), I Wayan Dasna 3), Muladi 4), Nurul Hidayat 1), Nugroho Adi Pramono 1), Juarendra Ramadani 5), Choirun Nisa 5)

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Corresponding Author
Samsul Hidayat

Institutions
1) Jurusan Fisika FMIPA Universitas Negeri Malang
2) Jurusan Biologi FMIPA Universitas Negeri Malang
3) Jurusan Kimia FMIPA Universitas Negeri Malang
4) Jurusan Elektro FT Universitas Negeri Malang
5) Mahasiswa Jurusan Fisika FMIPA Universitas Negeri Malang

Abstract
Batteries energy are needed in UAV system. Li-Ion or Li-Po batteries are often used of UAV operations. The presence of additional energy is very useful for long time flying. UAV turns or stops suddenly will be helped if the brushless motor is equipped with a brake system. Coreless generators are known as generators that require low torque to be able to produce electrical energy. In this research, coreless generators are attached to brushless motors equipped with propellers. Motor with propellers are driven by ESC. The amount of power consumption, rotational speed, thrust, and energy generated by brushless are recorded. Also, the effect of generator coreless loading is varied to get data on brushless rotation speed. Energy batteries are needed in UAV flights. Li-Ion or Li-Po batteries are often the foundation of UAV operations. It will be an additional source for UAVs when flying UAVs get an energy supply. UAV turns or stops suddenly will be helped if the brushless motor is equipped with a brake system. Coreless generators are known as generators that require low torque to be able to produce electrical energy. Brushless generator applications can also be an energy source. In this research, coreless generators are attached to brushless motors equipped with propellers. Motor equipped propellers are rotated by means of ESC. The amount of power consumption, rotational speed, magnitude of thrust, and energy generated by brushless are recorded. Also, the effect of generator coreless loading is varied to get data on brushless motor slowdown.

Keywords
coreless generator, UAV

Topic
Electromagnetic Methods

Link: https://ifory.id/abstract/LMe4An3bNBZ8


IDENTIFICATION GEOTHERMAL SYSTEM BASED ON 1D,2D,3D INVERSION AND TDEM STATIC SHIFT CORRECTION STUDY CASE MT. ARJUNO WELIRANG, EAST JAVA.
Waindini Nur Fitri (a*), Wien Lestari (b), Mariyanto (b).

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Corresponding Author
Waindini Nur Fitri

Institutions
Teknik Geofisika, Fakultas Teknik Sipil, Lingkungan, dan Kebumian, Insitut Teknologi Sepuluh Nopember, Surabaya.

Abstract
Mount Arjuno-Welirang is located on East Java province and stratovolcano with a height that is 3,339 m (10,955 ft) for Arjuno and 3.156 m for Welirang. Mountain (Mt) Arjuno Welirang geothermal system is a volcanic geothermal system. Magnetotelluric (MT) is the most commonly used method of geothermal exploration due to its deep penetration and sensitivity to conductive zone. Magnetotelluric method measures 103 point MT in the geothermal system field on the South of Mt Arjuno Welirang. And also TDEM acquisition measures 103 point to static shift correction. In this research, 1D inversion used Occam Inversion, meanwhile 2D and 3D inversion used Non Linear Conjugate Gradien (NLCG) Algorithm. The processing step of magnetotelluric are consist of time domain convertion to frequency domain, crosspower selection, smoothing data, static shift correction, 1D, 2D, 3D Inversion, and interpretation of inversion model. 3D model inversion consist of 3D with TDEM static shift correction. Based on the results comparisons of magnetotelluric 1D,2D,and 3D data inversion modeling, the conceptual model can delineate the altered rocks, clay cap, reservoir rocks, and fault structures that can support and give recommendation prospect area of Mt. Arjuno Welirang.

Keywords
Arjuno Welirang, Magnetotelluric, TDEM, Alteration, Inversion, Occam, Non Linear Conjugate Gradien (NLCG) Algorithm.

Topic
Electromagnetic Methods

Link: https://ifory.id/abstract/yFpBCnK9hQEA


IDENTIFICATION OF GEOLOGICAL STRUCTURE ACTIVE FAULT IN SOUTH OF EAST JAVA USING MAGNETOTELLURIC METHODS
Silvia Veronica, Wien Lestari, Mariyanto Mariyanto

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Corresponding Author
Silvia Veronica

Institutions
Department of Geophysical Engineering
Faculty of Civil, Environmental, and Geo Engineering
Institut Teknology Sepuluh Nopember
ITS Keputih, Sukolilo, Surabaya 60111

Abstract
The southern of Jawa Timur, Indonesia, is an area which relatively near the subduction zone and passed by a series of active volcanoes. The existence of subduction zone triggered tectonic activities which can cause the appearance of fault structure. Based on data released by Meteorological, Climatological and Geophysical Agency (BMKG) during the last 10 years showed the high intensity of earthquakes in Jawa Timur, particularly in Pacitan and Jember regions. This study aim to determine geometry and position of the fault along the southern of Jawa Timur based on the distribution of subsurface resistivity value as a result of the magnetotelluric method. Magnetotelluric method measured natural electric and magnetic field on the surface. The acquisition data were consist of 12 magnetotelluric measurement points using Metronix instrument. The two-dimensional resistivity model showed 2 (two) low resistivity zones over Pacitan and Jember area that indicated as an active fault with the trend relatively north east-south west with the dip were tend to the west.

Keywords
Fault, Magnetotelluric, Southern of Jawa Timur, Indonesia

Topic
Electromagnetic Methods

Link: https://ifory.id/abstract/MGP7VbC9H3qY


Identification of Impermeable Core Condition of Lahor Dam Based On Material Type and Water Pore Pressure Using Georadar Method.
Yoyok Adi Laksono (a*). Siti Zulaikah (b). Moch Bagas Setya Rahman (b)

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Corresponding Author
Mochammad Bagas Setya Rahman

Institutions
a) Physics Department, Faculty of Mathematics and Science, State University of Malang Jalan Semarang 5, Malang, East Java 65145, Indonesia.
*yoyok.adisetio.fmipa[at]um.ac.id

b) Advance Material and Mineral Laboratory, Faculty of Mathematics and Science, State University of Malang, Malang, 65115, Indonesia

Abstract
Lahor Dam is located in Karangkates Village, Sumber Pucung District, Malang Regency serves as an alternative connecting road between Malang regency and Blitar regency. Lahor Dam also functions as an area irrigation system and hydroelectric power plant. Of the 18 piezometer units in the impermeable core of the Lahor dam and there is only one active piezometer unit. This caused the water table surveillance in the impermeable layer of the Lahor dam to be disrupted. The purpose of this study was to determine the location of the water table using the georadar method in the impermeable core of the Lahor dam so that it can determine the type of material contained in it as well as the value of pore pressure from upstream to downstream of the dam. The georadar method is one method in geophysics that uses the principle of electromagnetic waves propagation. This research was carried out by scanning 7 tracks at the top of the dam from the south end to the north end and vice versa. The results of the data obtained are interpreted using Geoscan32 software to determine the location of the water table used to determine the type of material based on the calculation of the propagation speed of electromagnetic waves. The water pore pressure value is obtained by calculating the hydrostatic pressure where the water table is located on the piezometer location. Based on the results of analysis and interpretation of the data, it was found that the type of material in the impermeable of the Lahor dam is clay soil. The condition of the impermeable core of the Lahor dam is monitored safely, which can be seen from the decrease in the pore pressure value of the water from upstream to downstream of the dam.

Keywords
Dam, Water Pore Pressure, Soils, Impermeable Core, Ground Penetrating Radar, Geoscan32.

Topic
Electromagnetic Methods

Link: https://ifory.id/abstract/hYTPpfJUdBD9


Lahor Dam Inspection Using Georadar
Moch Bagas Setya Rahman (a), Yoyok Adisetio Laksono (a*), Siti Zulaikah (a), Daeng Ahmad Suaidi (a), Abdulloh Fuad (a)

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Corresponding Author
Yoyok Laksono

Institutions
(a)Department of Physics, Universitas Negeri Malang
*yoyok.adisetio.fmipa[at]um.ac.id

Abstract
One way to determine the condition of a dam is to compare the pore-water pressure upstream to downstream. If the upstream porewater pressure is higher than downstream, the dam is in good condition. The pore-water pressure at the dam is obtained from the piezometer that is planted inside the dam. If the piezometer is damaged, the condition of the dam core is unknown. This happened at the Lahor dam where of the 9 piezometers, only one was functioning. The porewater pressure of the piezometer is determined by the height of the water column above it so that if the water level is known in the dam core, the porewater pressure will be known. To find out the water table, georadar can be used using a B-scan survey technique along the Lahor dam. The radargram is then processed to obtain the type of material by finding the wave velocity with reference to the water level at the upstream of the dam. The location of the Water table is obtained from reflections due to anomalous material differences. From the results of surface water level analysis in upstream and downstream it can be concluded that the lahor dam is still in good condition.

Keywords
inspection, dam, Lahor, georadar

Topic
Electromagnetic Methods

Link: https://ifory.id/abstract/UHeuMpL6JEqY


Magnetocapacitive of FC/Mn2O3/ATiO3 (A=Ba,Ca,Sr) for Supercapacitor Electrode
Suci Elya Intan Suryani (a), Nabella Sholeha (a), Thathit Suprayogi (a), Ahmad Taufiq (a, b), Nandang Mufti (a, b), Markus Diantoro (a*, b)

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Corresponding Author
Suci Elya Intan Suryani

Institutions
a) Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Jl. Semarang 5 Malang 65145, Indonesia

b) Centre of Advanced Materials for Renewable Energy, Universitas Negeri Malang, Jl. Semarang 5 Malang 65145, Indonesia

* markusdiantoro.fmipa[at]um.ac.id

Abstract
The effort of searching for a new stable oxide electrode for supercapacitor is extensively performed. For the conventional capacitor, the capacitive storage could be strongly depend on high dielectric materials. Besides the high capacity, the release rate is one of the crucial issue for supercapacitor. For the latest case, we should improve a total conductivity of introduce other ionic materials in the system. The high ferroelectric materials of perovskite ATiO3 could candidate for high capacitive materials by introducing FC (Functionalized Carbon) with FC stands for enhancing the conductivity and dielectric constant of composite. The new known common supercapacitor materials of FC (Graphene, Acetylene Carbon Black), Mn2O3, and ATiO3 could be a good candidate for high energy density supercapacitor. The new integrated thermoelectric-supercapacitor device lately introduced due to the implementation of thermoelectric under magnetic field. ATiO3 has been synthesized using conventional solid-state reaction with intermediate calcination. The composite FC/Mn2O3/ATiO3 with ethanol adhesive has been fabricated using conventional die pressed. The capacitance as a function of magnetic field was characterized using DC capacitance meter under various magnetic field generated by double coil magnetic generator.

Keywords
magnetocapacitive, capacitance, FC-Mn2O3-ATiO3, magnetic field, supercapacitor

Topic
Electromagnetic Methods

Link: https://ifory.id/abstract/ykfUZaDHwLMx


Temperature Effect on Crystal Structure and Optical Properties of Zinc Oxide
Nurul Hidayat1,a), Sunaryono1), Ahmad Taufiq1), Rosy Eko Saputro1), Kusnunnahari1), Laemthong Chuenchom2)

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Corresponding Author
Nurul Hidayat

Institutions
1) Department of Physics, Faculty of Mathemtics and Natural Sciences, Universitas Negeri Malang, Jl. Semarang 5 Malang, 65145, Indonesia
2) Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Prince of Songkla University, Hat-Yai, Songkhla 90112, Thailand

a) corresponding authors email: nurul.hidayat.fmipa[at]um.ac.id

Abstract
Zinc oxide has always been one of the most important materials for advanced applications, even with different shapes and sizes. In this present study, we report the crystal formation and optical characteristics of zinc oxide materials. A sol-gel technique at ambient condition was chosen to fabricate the zinc oxide from zinc acetate precursor. In case of low purity of zinc oxide phase formation, heat treatment may solve the problem. We observed that the heating temperature enables the reduction of impurities and therefore enhace the properties of the produced zinc oxide. The optical properties discussed in this study are absorbace, energy gap, refractive index, and optical conductance.

Keywords
Heat Treament, Crystal Structure, Optical Properties

Topic
Electromagnetic Methods

Link: https://ifory.id/abstract/AWdfT4FtEak3


Two Dimensional Magnetotelluric Inversion Using Sparse Direct Solver in Transverse Electric (TE) Mode
Tiffany Tjong1, a) , Lisa Yihaa- Roodhiyah1 , Nurhasan1 , Doddy Sutarno1

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Corresponding Author
Tiffany Tjong

Institutions
1Electromagnetic Induction Lab., Physics of Complex System Div., Faculty off Mathematics and Natural Sciences, Institut Teknologi Bandung, Indonesia

Abstract
We implemented sparse directs solver in our TE-mode magnetotelluric inversion program. The two dimensional inversion program was built using edge finite element modelling. The use of edge finite element could improve the accuracy of magnetotelluric modelling. However, solving the sparse linear system of edge finte element is very time consuming and this would affect the time required to solve the inversion problem. Using the sparse direct solver to solve the linear system in edge element modelling could make the inversion faster and more efficient.

Keywords
magnetotelluric, inversion

Topic
Electromagnetic Methods

Link: https://ifory.id/abstract/XCnMyvhrT7mj


Two-Dimensional (2-D) Modeling of Magnetotelluric Field Data (Papandayan Field Data) Using Edge Finite-Element Method
Lisa- Yihaa Roodhiyah (a*), Tiffany Tjong (a), Nurhasan (a), D Sutarno (a)

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Corresponding Author
Lisa Yihaa Roodhiyah

Institutions
(a) Electromagnetic Induction Lab., Physics of Complex System Div., Faculty of Mathematics and Natrural Sciences, Bandung Institute of Technology, Jalan Ganesha 10, Bandung 40132, Indonesia
*lisa_yihaa[at]s.itb.ac.id

Abstract
Edge finite element (vector finite element) which is solved using sparse direct solver (PARDISO) has been used in this paper to model 2-D magnetotelluric field data (Papandayan field data). The site sounding of the field data which is used on this modeling are 10 site soundings. The focus of this paper is on the using 2-D magnetoteluric modeling scheme which is developed to model field data. First, the generating mesh to the field data and choosing the appropriate model are reviewed. Normalize coordinate to get the zero point before the meshing step is important so that the sensitivity matrices did not contain big amount of number which computationally can cause error in calculating matrices. Prior information needed to define the appropriate model. Second, the accuracy of the modeling result (apparent resistivity and phase) is compared to field data. In the end, it has shown that the modeling result has a good agreement with the field data which shows that there are divided by three areas with different resistivity. In the shallow depth (<1500 m) are dominated with low resistivity (around 5 Ωm). Next, the resistivity increases within the depth in 1500m until 3200m which are 150 Ωm until 300 Ωm. Then, finally the resistivity decreased in the deep depth (>3200 m) which around 3 Ωm.

Keywords
field data, magnetotelluric modeling, two-dimensional modeling, vector finite element, edge finite element, sparse direct solver

Topic
Electromagnetic Methods

Link: https://ifory.id/abstract/mZEfc4p8qvdX


USING GEORADAR AS A DAM POREWATER PRESSURE MEASUREMENT: CASE STUDY OF SUTAMI DAM
Yoyok Adisetio Laksono (a*), Siti Zulaikah (a), Sutrisno (a), Zulkifli Yusop (b), Moch Bagas Setya Rahman (a), Qorny Faren Anggana (a)

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Corresponding Author
Yoyok Laksono

Institutions
a) Department of Physics, Universitas Negeri Malang
* yoyok.adisetio.fmipa[at]um.ac.id
b) Centre for Environmental Sustainability & Water Security (IPASA), Faculty of Civil Engineering, Universiti Teknologi Malaysia

Abstract
The piezometer is generally used as a porewater pressure gauge at the core of the dam. Piezometer is placed in the upstream and downstream where if the upstream porewater pressure is higher than the downstream, the dam is in good condition. The piezometer that is planted in the dam can be damaged and the replacement is not possible to be done because it is embedded deep in the core of the dam. Because the piezometer basically measures the height of the water table to the piezometer so that if the height of the water table in the core of the dam is known, so the value of the pressure in the dam is known also. One way to find out the water level is to measure it by using georadar. The purpose of this study was to determine the feasibility of georadar to finding the porewater presure. As a case study, this study was conducted at the Sutami dam which still has a functioning piezometer. Measurements are made by B-scan at the location above the piezometer in the middle of the dam. The Radargram from the GPR is then analyzed in two steps, namely (1) determining the type of core material of the dam, and (2) calculating the pore pressure based on the water level and comparing the result with actual value from piezometer. The result shows that georadar can be used as a substitute for piezometers to measure porewater presure.

Keywords
georadar, porewater presure, dam, Sutami dam

Topic
Electromagnetic Methods

Link: https://ifory.id/abstract/HR4we8L9QFrm


Wireless Brushless Motor Current Consumption Measurement Based on Ferrite Magnetic Flux Concentrator and Bluetooth HC-05 with Android Smart Phone Display
Samsul Hidayat 1), Fatchur Rahman 2), I Wayan Dasna 3), Muladi 4), Nurul Hidayat 1), Nugroho Adi Pramono 1), Juarendra Ramadani 5), Choirun Nisa 5)

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Corresponding Author
Samsul Hidayat

Institutions
1) Jurusan Fisika FMIPA Universitas Negeri Malang
2) Jurusan Biologi FMIPA Universitas Negeri Malang
3) Jurusan Kimia FMIPA Universitas Negeri Malang
4) Jurusan Elektro FT Universitas Negeri Malang
5) Mahasiswa Jurusan Fisika FMIPA Universitas Negeri Malang

Abstract
The Unmanned Aerial Vehicles (UAV) technologies are growing rapidly. This is supported by sensor, control, and actuator technology. The development of UAV technology strongly supports for surveys, exploration, real-time monitoring territory, and so on. Multirotor UAVs is use brushless motors as a driver for moving. Brushless motor controlled by ESC. ESC receives DC power to be converted into commutative DC to drive brushless motors. ESC actually also senses the position of brushless motor rotors in determining their command. Battery energy efficiency, critical, the remaining flight time are important thing of UAVs. For this reason, the purpose of this research is to create a device that can be used for consumption monitoring of wireless brushless motor with Android smart phone devices. The steps taken are the design of android smart phone software / applications and design of current sensors with the hall effect phenomenon. The large magnetic field in the current of the wire is directly proportional to the large current through the conductor, and inversely proportional to the square of the distance. The magnetic field can cause concentrations of electrons to certain sides of each conductor plate. This phenomenon can cause a potential difference in the conductor plate and is often called the hall effect. Magnitic flux is continued by the permeability of the material exposed to magnetic flux. By providing iron core material, or ferrite ring, magnetic flux will accumulate on the ferrite ring. The hall sensor inserted at the space of the ferrite ring will be more rich in magnetic flux. This is used for measuring current without breaking the conductor. The hall of the voltage value are transmitted with the HC-05 bluetooth module to the Android smart phone for displaying..

Keywords
wireless, current sensor, bluetooth

Topic
Electromagnetic Methods

Link: https://ifory.id/abstract/HkgFyXeb2Mw6


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