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All Journal Mechatronics, Electrical Power, and Vehicular Technology IPTEK The Journal for Technology and Science Jurnal IPTEK Teknologi Indonesia Ketenagalistrikan dan Energi Terbarukan
Pudji Irasari
Research Center for Electrical Power and Mechatronics, Indonesian Institute of Sciences, Jl. Sangkuriang Komplek LIPI Gedung 20 Lantai 2 Bandung, 40135
Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Energy Industrial & Manufacturing Engineering Mechanical Engineering

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PENGARUH HARMONIK TERHADAP TEGANGAN KELUARAN PROTOTIP GENERATOR MAGNET PERMANEN KECEPATAN RENDAH Irasari, Pudji; Fitriana, -
Teknologi Indonesia Vol 32, No 1 (2009)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v32i1.49

Abstract

This paper discusses harmonic content in the generator prototype of 1035W, 220V, 3 phase, 333 rpm with the shifting of permanent magnet segment of 15,7 mm. Magnetomotive Force (MMF) caused by stator current is analyzed using Fourier series to obtain harmonics in load condition. Only induction voltage generated by permanent magnet that is taken into consideration of no-load harmonics. Harmonic spectrums are presented in the form of Total Harmonic Distortion (THD) versus. harmonic number. The influence of the highest THD spectrum to the waveform of output phase voltage is analyzed. Theoritical analyses and experimental measurement results of harmonic spectrums and output phase voltage waveform show the similar pattern. The difference of the output phase voltage peak is estimated due to the exceedingly low value of parameter Bm.
OPTIMASI KEMIRINGAN MAGNET PADA GENERATOR MAGNET PERMANEN KECEPATAN RENDAH FLUKS RADIAL Irasari, Pudji; Kasim, Muhammad; Fitriana, -
Teknologi Indonesia Vol 33, No 1 (2010)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v33i1.13

Abstract

Optimization of magnet skewing of 1 kW, 3 phase, 300 rpm permanent magnet generator has been conducted in this research. The optimization is carried out by simulating some position of the rotor magnet skewing (x). The defi nition of skewing in this experiment is the outer line of one pole that is appear due to the shifting of two magnet segments that forming the pole. The three skewing position that is analyzed are x1 = 16 mm, x2 = 21 mm, x3 = 25,6 mm. Those skewing positions result in different harmonic distortion (HD) and EMF voltage waveform. The experimental validation shows that the best characteristic is obtained at skewing of x = 21 mm with HD = 11.9% and has the most sinusoidal EMF voltage waveform.
POWER CURVE PREDICTION OF SMALL SCALE WIND TURBINE REFERRING TO THE GENERATOR CHARACTERISTIC Irasari, Pudji; Candra, Dodiek Ika
Teknologi Indonesia Vol 36, No 3 (2013)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v36i3.207

Abstract

This paper discusses power curve prediction of small scale wind turbine for a battery charger. The proposed prediction method does not require the data of wind speed but refers to the generator characteristic instead. The method is based on wind turbine power equation initiated with determining the value of Cp, then establishes the powerwind speed and shaft speedwind speed correlations. For simplicity, this method ignores aerodynamic factor of the system. The simulation result in the form of wind turbine power curve (power versus wind speed graph) is then compared with the characteristics of commercial wind turbine and demonstrates rational values of cut-in and cut-out wind speed.
Design and Analysis of the Prototype of Pico Hydro Scale Submersible Type Turbine-Generator for Flat Flow River Application Subekti, Ridwan Arief; Susatyo, Anjar; Irasari, Pudji
Teknologi Indonesia Vol 35, No 3 (2012)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v35i3.188

Abstract

This paper discusses the design and analysis of prototype of submersible type turbine-generator for fl at fl ow river application. 500 W pico hydro turbine with the net head of 1 m was used. The type of turbine used was ofPropeller type with the blade profi le shape of airfoil NACA 6412 and the runner blade number of 6 pieces. Turbine and generator was aligned on one shaft (direct coupled) so that the construction was simple. The generator usedwas of permanent magnet generator type of 500 W, 500 rpm, 1 phase, 50Hz, 220 V. The turbine-generator unit was then tested in one of Kebun Raya Cibodas channels. The test was conducted at varied heads and constant loadscomprised of 5 x 100 W lights. The test results presented in the form of head vs. speed and head vs. power graphs show that the system could only have effi ciency of 19.98%.
TECHNO-ECONOMIC COMPARATIVE STUDY OF VERY LOW HEAD HYDRO POWER: CASE STUDY IN BINTAR VILLAGE, NUNUKAN, EAST KALIMANTAN Subekti, Ridwan Arief; Irasari, Pudji
Teknologi Indonesia Vol 37, No 2 (2014)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (16.051 KB) | DOI: 10.14203/jti.v37i2.222

Abstract

This paper discusses techno-economic comparative study of very low head hydro power (VLHHP) between the penstock and non-penstock systems. The selected location is river current in the Bintar Village, Nunukan, EastKalimantan. The technical analysis is performed to determine the generated potential power, the type of components used and the investment cost per kW needed. The economic analysis is then conducted by implementing IRR and NPV methods to find out whether the project is economically feasible to be executed. The technical analysis results exhibit that the generated power using penstock system is higher than that of using non-penstock system; that is, 5.70 kW. The power of non-penstock system of 3.336 kW could be attained by applying modular system comprised by 4 units of propeller turbines installed in parallel. The economic analysis shows that the penstock system requires higher investment cost that is Rp58,480,272 and both systems are not feasible to be realized since they have negative NPVs. It is, therefore, recommended to fund the project through grant.
ANALISIS PENGARUH RAPAT FLUKS CELAH UDARA TERHADAP KARAKTERISTIK GENERATOR MAGNET PERMANENT Kasim, Muhammad; Fitriana, Fitriana; Irasari, Pudji
Ketenagalistrikan dan Energi Terbarukan Vol 10, No 2 (2011): KETENAGALISTRIKAN DAN ENERGI TERBARUKAN
Publisher : P3TKEBTKE

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Unjuk kerja generator magnet permanen (GMP) dipengaruhi oleh beberapa hal, salah satunya adalah nilai rapat fluks celah udara (Bg) magnet permanen yang digunakan. Fluks celah udara merupakan mutual fluks yang dibangkitkan oleh magnet permanen dan lilitan dalam alur. Paper ini membahas pengaruh Bg terhadap karakteristik berbeban dan tanpa beban generator magnet permanen 3 kW, 3 fasa, 300 rpm. Nilai Bg yang di bandingkan adalah 0,38 T dan 0,5 T. Dengan metode analitik, jumlah lilitan per fasa dapat dihitung. Dari hasil perhitungan lilitan dapat diketahui besarnya tegangan yang dihasilkan pada kondisi tanpa beban dan daya yang dihasilkan pada kondisi berbeban. Hasil pengujian di laboratorimum menunjukkan bahwa Bg 0,38 T membangkitkan tegangan 400 volt dan daya 1989 watt pada 300 rpm. Sedangkan Bg 0,5 T membangkitkan tegangan 300 volt dan daya 1770 W pada 300 rpm. Pada putaran nominal hasil pengujian menunjukkan rugi panas yang terjadi untuk Bg 0,38 T mengalami kenaikan sekitar 18% dibandingkan dengan rugi panas pada Bg 0,5 T. Kenaikan rugi panas ini lebih besar dibandingkan dengan kenaikan daya yang mengalami kenaikan sebesar 10%. Nilai Bg menentukan besarnya nilai tegangan yang mempengaruhi besarnya daya yang dihasilkan GMP.
ANALISIS TORSI COGGING PADA PROTOTIP GENERATOR MAGNET PERMANEN 1KW/220V/300RPM Fitriana, Fitriana; Irasari, Pudji; Kasim, Muhammad
Ketenagalistrikan dan Energi Terbarukan Vol 9, No 2 (2010): KETENAGALISTRIKAN DAN ENERGI TERBARUKAN
Publisher : P3TKEBTKE

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Torsi cogging merupakan karakteristik melekat pada generator magnet permanen (GMP) yang disebabkan oleh geometri generator. Torsi cogging dapat mempengaruhi kemampuan start, menimbulkan bising dan vibrasi mekanik bila GMP dipasang pada turbin angin. Oleh karena itu torsi cogging GMP harus dibuat sekecil-kecilnya, salah satu caranya adalah dengan memiringkan magnet permanen. Dalam makalah ini simulasi torsi cogging dilakukan terhadap prototip GMP kapasitas 1 kW, 220V, 300 RPM dengan 3 kemiringan magnet. Generator dirancang dengan 18 kutub dan 2 magnet pada setiap kutubnya. Simulasi menggunakan metode variasi energi untuk mengetahui besarnya torsi cogging yang ditimbulkan akibat berputarnya magnet. Hasil simulasi menunjukkan bahwa torsi cogging dapat berkurang sampai nol saat magnet dimiringkan penuh yaitu sebesar satu kisar alurnya atau 8,6 mm. Hasil simulasi torsi cogging ini selanjutnya divalidasi dengan besaran torsi start pada metode pengujian GMP menggunakan lengan torsi. Kemiringan magnet terbaik dicapai saat lebar kutub 21 mm atau sudut kemiringan 3,88° (58% kisar alurnya) karena pada posisi ini dihasilkan torsi cogging dan torsi start paling kecil.
ANALYTICAL DESIGN METHOD OF 3 KW, 200 RPM PERMANENT MAGNET GENERATOR FOR RENEWABLE ENERGY POWER PLANT APPLICATIONS Irasari, Pudji; Alam, Hilman Syaeful; Kasim, Muhammad
Ketenagalistrikan dan Energi Terbarukan Vol 12, No 1 (2013): KETENAGALISTRIKAN DAN ENERGI TERBARUKAN
Publisher : P3TKEBTKE

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

This paper discusses the analytical design method of 3 kW, 200 rpm radial flux permanent magnet generator (PMG) for renewable energy power plant applications. The proposed design method is conducted in two stages, i.e. initiation and validation stages. In the initiation stage, some of the parameters should be specified with values, such as output power, specific magnetic loading, rotation, etc. Results of this stage are detail dimensions of the stator and rotor, which then serve as a reference to recalculate the flux density (entering validation phase). With the new value of specific magnetic loading, all related parameters should also be recalculated, such as the number and diameter of the turns. Furthermore, design is validated by testing the prototype of generator using water resistance load. The test results show that it produces 3043.64 W of power and 253.51 V of voltage at 200 rpm. Compared to the analytical calculation, the power is 0.86% lower and the voltage is 12.45% higher. These results illustrate that the design has been performed properly since the targeted output power can be achieved at the desired speed. Paper ini membahas metoda perancangan analitik generator magnet permanent fluks radial 3 kW, 200 rpm untuk aplikasi pembangkit listrik energi terbarukan. Metoda perancangan yang diusulkan dilakukan dalam dua tahap, yaitu tahap inisiasi dan tahap validasi. Dalam tahap inisiasi, beberapa parameter nilainya harus ditentukan, seperti daya keluaran, specific magnetic loading, putaran, dll. Hasil akhir tahap ini berupa dimensi detil stator dan rotor yang kemudian dijadikan sebagai acuan untuk menghitung kembali specific magnetic loading (memasuki tahap validasi). Dengan nilai specific magnetic loading yang baru, parameter lain yang terkait harus dihitung kembali, seperti jumlah dan diameter lilitan. Selanjutnya, desain divalidasi dengan menguji prototipe generator menggunakan beban tahanan air. Hasil pengujian menunjukkan bahwa generator membangkitkan daya 3043.64 W dan tegangan 253.51 V pada 200 rpm. Jika dibandingan dengan hasil perhitungan, daya eksperimen lebih kecil 0.86% sedangkan tegangannya, lebih besar 12.45%. Hasil tersebut menunjukkan bahwa metoda desain yang diusulkan telah dilakukan dengan teliti karena target daya keluaran dapat dicapai pada putaran yang diinginkan.
Load characteristic analysis of a double-side internal coreless stator axial flux PMG Wirtayasa, Ketut; Irasari, Pudji; Kasim, Muhammad; Widiyanto, Puji; Hikmawan, Muhammad Fathul
Journal of Mechatronics, Electrical Power and Vehicular Technology Vol 10, No 1 (2019)
Publisher : Research Centre for Electrical Power and Mechatronics, Indonesian Istitutes of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2867.192 KB) | DOI: 10.14203/j.mev.2019.v10.17-23

Abstract

The main issue of using a permanent magnet in electric machines is the presence of cogging torque. Several methods have been introduced to eliminate it, one of which is by employing a coreless stator. In this paper, the load characteristic analysis of the double-side internal coreless stator axial flux permanent magnet generator with the specification of 1 kW, 220 V, 50 Hz, 300 rpm and 1 phase is discussed. The purpose is to learn the effect of the load to the generator performance, particularly the output power, efficiency and voltage regulation. The design and analysis are conducted analytically and numerically with two types of simulated loads, pure resistive and resistive-inductive in series. Each type of load provides power factor 1 and 0.85 respectively. The simulation results show that when loaded with resistive load, the generator gives a better performance at the output power (1,241 W) and efficiency (91 %), whereas a better voltage regulator (5.86 %) is achieved when it is loaded with impedance. Since the difference in the value of each parameter being compared is relatively small, it can be concluded that the generator represents good performance in both loads.
Analisis Getaran pada Generator Magnet Permanen 1kW Hasil Rancang Bangun Pusat Penelitian Tenaga Listrik dan Mekatronik Irasari, Pudji; Nugraha, Aditya Sukma; Kasim, Muhammad
Journal of Mechatronics, Electrical Power and Vehicular Technology Vol 1, No 1 (2010)
Publisher : Research Centre for Electrical Power and Mechatronics, Indonesian Istitutes of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (283.048 KB) | DOI: 10.14203/j.mev.2010.v1.19-26

Abstract

Vibration in a generator is an important factor in detail of design. To know the behavior of the vibration, a test is performed using vibratiometer. The aim in writing this paper is to obtain reference classification of vibration that can be viewed on a standard IEC 34-14 and DIN EN 60034-14. In this paper the results of testing, the value of velocity and acceleration, will be measured analytically so asto create value that can be used to compare the value of the test results with the value from 34-14 IEC and DIN EN 60034-14 standards. 
Co-Authors A.A. Ketut Agung Cahyawan W Anwar Muqorobin Dodiek Ika Candra Dyah Kusuma Dewi Fitriana, - Hikmawan, Muhammad Fathul Hilman Syaeful A Syaeful A Hilman Syaeful Alam Muhammad Kasim Puji Widiyanto, Puji Ridwan Arief Subekti Sukma Aditya Susatyo, Anjar Wirtayasa, Ketut Yoga Yuniadi