Implementation of a new flux rotor based on model reference adaptive system for sensorless direct torque control modified for induction motor

Introduction. In order to realize an efficient speed control of induction motor, speed sensors, such as encoder, resolver or tachometer may be utilized. However, some problems appear such as, need of shaft extension, which decreases the mechanical robustness of the drive, reduce the reliability, and increase in cost. Purpose. In order to eliminate of speed sensors without losing. Several solutions to solve this problem have been suggested. Based on the motor fundamental excitation model, high frequency signal injection methods. The necessity of external hardware for signal injection and the adverse influence of injecting signal on the motor performance do not constitute an advantage for this technique. Fundamental model-based strategies method using instantaneous values of stator voltages and currents to estimate the rotor speed has been investigate. Several other methods have been proposed, such as model reference adaptive system, sliding mode observers, Luenberger observer and Kalman filter. The novelty of the proposed work consists in presenting a model reference adaptive system based speed estimator for sensorless direct torque control modified for induction motor drive. The model reference adaptive system is formed with flux rotor and the estimated stator current vector. Methods. The reference model utilizes measured current vector. On the other hand, the adjustable model uses the estimated stator current vector. The current is estimated through the solution of machine state equations. Practical value. The merits of the proposed estimator are demonstrated experimentally through a test-rig realized via the dSPACE DS1104 card in various operating conditions. The experimental results show the efficiency of the proposed speed estimation technique. Experimental results show the effectiveness of the proposed speed estimation method at nominal speed regions and speed reversal, and good results with respect to measurement speed estimation errors obtained.Вступ. Щоб реалізувати ефективне керування швидкістю асинхронного двигуна, можна використовувати датчики швидкості, такі як енкодер, резольвер або тахометр. Однак виникають деякі проблеми, такі як необхідність подовження валу, що знижує механічну міцність приводу, знижує надійність та збільшує вартість. Мета. Для усунення датчиків швидкості без втрати. Було запропоновано кілька рішень на вирішення цієї проблеми. На основі моделі основного порушення двигуна використовуються методи подачі високочастотного сигналу. Необхідність зовнішнього обладнання для подачі сигналу та несприятливий вплив подачі сигналу на роботу двигуна не є перевагою цього методу. Досліджено метод стратегій на основі фундаментальних моделей з використанням миттєвих значень напруг та струмів статора для оцінки швидкості обертання ротора. Було запропоновано кілька інших методів, таких як еталонна адаптивна система моделі, спостерігачі режиму ковзання, спостерігач Люенбергера і фільтр Калмана. Новизна запропонованої роботи полягає у поданні модельної еталонної адаптивної системи оцінки швидкості прямого бездатчикового управління моментом, модифікованої для асинхронного електроприводу. Еталонна адаптивна система моделі формується з магнітним потоком ротора та оціненим вектором струму статора. Методи. Еталонна модель використовує вимірюваний вектор струму. З іншого боку, модель, що регулюється, використовує передбачуваний вектор струму статора. Струм оцінюється шляхом вирішення рівнянь стану машини. Практична цінність. Переваги запропонованого оцінювача продемонстровані експериментально на тестовій установці, реалізованій на платі dSPACE DS1104 у різних умовах експлуатації. Експериментальні результати свідчать про ефективність запропонованої методики оцінки швидкості. Експериментальні результати показують ефективність запропонованого методу оцінки швидкості в областях номінальних швидкостей та реверсивних швидкостей, а також хороші результати щодо отриманих похибок оцінки швидкості вимірювання

Pengaruh Struktur Modal Dan Profitabilitas Terhadap Harga Saham (Studi Pada Perusahaan Asuransi Yang Terdaftar Di Bursa Efek Indonesia Tahun 2012-2015)

The objective of this research was to determine the effect simultaneously, partialy and dominanty of Capital Structure and Profitability on Stock Price in Insurance company listed on the Indonesia Stock Exchange Year 2012-2015. The population of this research is insurance companies listed in Indonesia Stock Exchange Year 2012-2015. From those compаnies, there аre 10 compаnies which considered аs the sаmple of this reseаrch. The dаtа collection wаs conduted in Gаllery of Indonesiа Stock Exchаnge in form of finаnciаl reports of eаch compаny. The technique of the dаtа аnаlysis used is multiple lineаr regression. Bаsed on the result of this reseаrch, the reseаrcher concluded thаt the cаpitаl structure which represented by DER (X1), DАR (X2) аnd profitаbility represented by ROE (X3), EPS (X4) simultаneously hаs significаnt effect on stock price (Y). DER (X1) pаrtiаlly hаs negаtive effect on stock price (Y). DАR (X2) аnd EPS (X4) pаrtiаlly hаs positive effect on stock price (Y).ROE (X3) pаrtiаlly hаs no effect on stock price (Y). EPS (X4) is а vаriаble thаt hаs dominаnt effect on stock price (Y)

Pengaruh Bi Rate, Fed Rate, Dan Kurs Rupiah Terhadap Indeks Harga Saham Gabungan (Ihsg) (Studi Pada Bursa Efek Indonesia Periode 2008-2015)

The purpose of this study to examine the effect of BI Rate, FED Rate, and Kurs Rupiah simultaneously, partially, and dominant variabels affect on Composite Stock Price Index by using multiple linier regression analysis. This study uses data monthly of January 2008 to December 2015 with 96 sample of data time series for each independent and dependet variabel. Simoultan analysis shows BI Rate, FED Rate, and Kurs Rupiah significantly affect Composite Stock Price Index. Partial analysis shows: first, BI Rate affect negative on Composite Stock Price Index; second, FED Rate does not affect Composite Stock Price Index; third, Kurs Rupiah affect negative on Composite Stock Price Index. Variables dominant affect on Composite Stock Price is variable Kurs Rupiah. The finding in this study idicate the diversity information about changes in FED Rate so that investors tend to be confident on the self evaluation to decide on stock investing

Efektivitas Penerimaan Pajak Restoran Dalam Meningkatkan Pendapatan Asli Daerah (Pad) (Studi Pada Dinas Pendapatan Asli Daerah Kabupaten Kediri)

Local Revenue (PAD) is the income earned and collected by local regulations in accordance with the legislation. Tax restaurant became one of the sectors which have great potential in contributing to regional revenue in Kediri. This study aims to determine the effectiveness of the restaurant tax revenue and tax revenue restaurants effectiveness in improving the regional revenue. This research use descriptive research. The research location is Revenue Service Kediri. Results of the study was the rate of tax effectiveness restaurants in Kediri, show results very effective. The average level of effectiveness of Kediri Regency restaurant tax revenue in 2008-2012 was 145.73%. Restaurant tax contribution to PAD Kediri Regency in 2008-2012 in 2008-2012, respectively for 1.48%, 0.37%, 0.55%, 1.14%, 1.27% with an average of 0.96%. The conclusion that can be obtained from this study showed that the rate of the tax effectiveness of the restaurant is quite high. But the restaurant tax contribution to regional revenue still lacking. It is necessary for the role of government and stakeholders to explore the potential for a sizeable return on the restaurant tax

Evaluasi Sistem Pengendalian Intern Atas Sistem Akuntansi Penjualan Dan Penerimaan Kas (Studi Pada PT. Astra International, Tbk – Auto 2000 Malang, Sutoyo)

Internal control system is the essential element in a company . A system of internal control having the function which is to secure their wealth company .To this research the evaluation a system of internal contorl system focused in an accounting system sales and cash acceptance on PT .Astra International , Tbk - AUTO 2000 Malang Sutoyo .AUTO 2000 Malang Sutoyo having some kind of sales likes car selling in cash , car sales by leasing services , spare parts selling in cash, and spare parts seliing in credit .Many a kind of sales in the company caused a needen in system of internal control to meet the needs of their wealth security company .This research aims to evaluate a control system to the company that focuses on the sales activity and acceptance of the company cash .Evaluation aimed to analyze a deficiency and an excess of the implementation of the internal control company

Analisis Rasio Keuangan Dan Metode Economic Value Added (Eva) Untuk Menilai Kinerja Keuangan Perusahaan (Studi Kasus Pada PT. Astra Otoparts, Tbk Dan PT. Gajah Tunggal, Tbk Yang Terdaftar Di Bursa Efek Indonesia Periode 2013-2015)

This study was conducted to determine the financial performance of PT. Astra Otoparts, Tbk and PT. Gajah Tunggal, Tbk listed on Indonesia Stock Exchange during 2013-2015 period by using financial ratio analysis and Economic Value Added (EVA) method. Moreover to know the difference in financial performance between the two companies by using a Difference Test between the analysis of financial ratios and the method of Economic Value Added (EVА). This type of reseаrch is descriptive reseаrch with quаntitаtive аpproаch. The object of reseаrch tаken is two аutomotive compаnies from аll аutomotive compаnies listed in BEI аs reseаrch sаmple, thаt is PT. Аstrа Otopаrts, Tbk аnd PT. Gаjаh Tunggаl, Tbk. Sources of dаtа in this study using secondаry dаtа sources obtаined directly from the Corner of Indonesiа Stock Exchаnge Fаculty of Economics University Brаwijаyа. The results of this study indicаte thаt bаsed on the results of finаnciаl rаtio аnаlysis in eаch rаtio contаined shows the finаnciаl performаnce of PT. Аstrа Otopаrts, Tbk is better thаn PT. Gаjаh Tunggаl, Tbk. Bаsed on the cаlculаtion method of Economic Vаlue Аdded (EVА) seen finаnciаl performаnce of PT. Gаjаh Tunggаl, Tbk better thаn PT. Аstrа Otopаrts, Tbk becаuse it shows positive аnd higher EVА vаlue

Evaluasi Penerapan Pernyataan Standart Akuntansi Keuangan (PSAK) No.102 Tentang Pembiayaan Murabahah (Studi Pada PT. Bank Mandiri Syraih Cabang Malang)

This study aims to understand the Murabahah in the company in order to fit your Statement of Accounting Standards (SFAS) 102 for regulations DSN MUI recommends that Islamic banks should be adjusted with SFAS 102. The object of this research is PT. Bank Mandiri Syariah Branch Malang with the type of research used is descriptive study, the data was obtained through primary data. Results from this study showed that Murabahah still found no compliance with the Statement of Accounting stadart (SFAS) 102. Suggestions that BSM set all activities in accordance with Statement of Financial Accounting Standards SFAS 102 and comply with all regulations set forth