Tesis sobre el tema "Zero speed sensorless control"
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Raute, Reiko. "Sensorless control of AC machines for low and zero speed operation without additional test signal injection". Thesis, University of Nottingham, 2009. http://eprints.nottingham.ac.uk/10930/.
Texto completoSevinc, Ata. "Speed sensorless control of induction motors". Thesis, University of Bristol, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364962.
Texto completoBudden, Alan Stephen. "Sensorless zero-speed position detection for brushless permanent magnet machines". Thesis, University of Bristol, 2006. http://hdl.handle.net/1983/05c6fe86-20a7-4a40-b39d-4f62d0c774a7.
Texto completoOzcelik, Eray. "Speed Sensorless Vector Control Of Induction Machine". Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/2/12606063/index.pdf.
Texto completos disadvantages, estimates the position of the rotor flux. Obtaining adequate torque control via FOC, speed loop is closed using conventional PI regulators. Speed feedback is necessary to complete control loop. Model Reference Adaptive System is studied as a speed estimator. Reactive power scheme is applied to MRAS algorithm to estimate rotor speed. In this study, the direct (rotor) flux oriented control system with flux and speed estimators is described and tested in real-time with the starter kit named TMS320F2812 eZdsp DSK and the Embedded Target for the TI C2000 DSP tool of Matlab
Zhang, Zaining. "Sensorless vector control for induction motors". Thesis, University of Sussex, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.340849.
Texto completoCilia, Joseph. "Sensorless speed and position control of induction motor drives". Thesis, University of Nottingham, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362888.
Texto completoKumara, I. N. Satya. "Speed sensorless field oriented control for induction motor drive". Thesis, University of Newcastle Upon Tyne, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.430695.
Texto completoRind, S. J. "Speed sensorless induction motor drive control for electric vehicles". Thesis, University of Liverpool, 2017. http://livrepository.liverpool.ac.uk/3008062/.
Texto completoComanescu, Mihai. "Flux and speed estimation techniques for sensorless control of induction motors". Connect to resource, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1116338965.
Texto completoTitle from first page of PDF file. Document formatted into pages; contains xv, 109 p.; also includes graphics. Includes bibliographical references (p. 106-109). Available online via OhioLINK's ETD Center
Bateman, Christopher John. "Sensorless control strategies for low-cost, high-speed electrical drive systems". Thesis, University of Newcastle Upon Tyne, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.607165.
Texto completoYang, Chao. "Speed Sensorless Control for Induction Motor Drives with AI-Based MRAS". Thesis, University of Newcastle Upon Tyne, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.525087.
Texto completoChretien, Ludovic. "POSITION SENSORLESS CONTROL OF NON-SALIENT PERMANENT MAGNET SYNCHRONOUS MACHINE". University of Akron / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=akron1145286531.
Texto completoJoukhadar, Abdulkader. "Quasi and fully sensorless speed control of indirect RFOC induction motor drives for low speed operation". Thesis, University of Aberdeen, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.401363.
Texto completoAkin, Bilal. "State Estimation Techniques For Speed Sensorless Field Oriented Control Of Induction Motors". Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/1055953/index.pdf.
Texto completothe steady-state and the transient-state of operations. Additionally, the measurement noise immunity of EKF is also investigated. Second, Unscented Kalman Filter (UKF), which is an updated version of EKF, is proposed as a state estimator for speed sensorless field oriented control of induction motors. UKF state update computations, different from EKF, are derivative free and they do not involve costly calculation of Jacobian matrices. Moreover, variance of each state is not assumed Gaussian, therefore a more realistic approach is provided by UKF. In this work, the superiority of UKF is shown in the state estimation of induction motor. Third, Model Reference Adaptive System is studied as a state estimator. Two different methods, back emf scheme and reactive power scheme, are applied to MRAS algorithm to estimate rotor speed. Finally, a flux estimator and an open-loop speed estimator combination is employed to observe stator-rotor fluxes, rotor-flux angle and rotor speed. In flux estimator, voltage model is assisted by current model via a closed-loop to compensate voltage model&rsquo
s disadvantages.
Ertugrul, Baris Tugrul. "Sensorless Vector Control Of Induction Motor Based On Flux And Speed Estimation". Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12610297/index.pdf.
Texto completoa kind of sensorless closed loop estimation technique- and Kalman filters is given. With the comparison of sensorless closed-loop speed estimation techniques, it has been attempted to identify their superiority and inferiority to each other by the use of simulation models and real-time experiments. In the experiments, the performance of the techniques developed and used in the thesis has been examined under extensively changing speed and load conditions. The real-time experiments have been carried out by the use of TI TMS320F2812 digital signal processor, XILINX XCS2S150E Field Programmable Gate Array (FPGA), control card and the motor drive card Furthermore, Matlab &ldquo
Embedded Target for the TI C2000 DSP&rdquo
and &ldquo
Code Composer Studio&rdquo
software tools have been used. The simulations and experiments conducted in the study have illustrated that it is possible to increase the performance at low speeds at the expense of increased computational burden on the processor. However, in order to control the motor at zero speed, high frequency signal implementation should be used as well as a different electronic hardware.
Chi, Song. "Position-sensorless control of permanent magnet synchronous machines over wide speed range". Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1186974583.
Texto completoSilva, César Armando. "Sensorless vector control of surface mounted permanent magnet machines without restriction of zero frequency". Thesis, University of Nottingham, 2003. http://eprints.nottingham.ac.uk/12435/.
Texto completoPern, Nan Jou. "CHARACTERIZATION OF ZERO MASS FLUX FLOW CONTROL FOR LOW SPEED AIRFOIL SEPARATION CONTROL". UKnowledge, 2008. http://uknowledge.uky.edu/gradschool_diss/577.
Texto completoErtek, Talip Murat. "Speed Estimation Techniques For Sensorless Vector Controlled Induction Motor Drive". Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606863/index.pdf.
Texto completoFaggion, Adriano. "Algorithms and Rotor Designs for the Position Estimation of PM Synchronous motors at Zero and Nonzero Speed". Doctoral thesis, Università degli studi di Padova, 2011. http://hdl.handle.net/11577/3427488.
Texto completoI convenzionali azionamenti elettrici per il controllo dei motori a Magneti Permanenti (PM) richiedo la conoscenza della posizione rotorica per poter applicare le trasformazioni dal sistema di riferimento stazionario a quello rotorico e viceversa. La posizione viene di norma determinata con un trasduttore di posizione che può essere un resolver, sonde ad effetto Hall o encoder. La presenza di questo trasduttore aumenta i costi, la grandezza e la complessità circuitale degli azionamenti e dei motori. Inoltre la loro manutenzione o sostituzione diventa difficoltosa in particolari applicazione, per es. pompe sommerse, macchine per l’eolico, ecc. L’eliminazione di questi trasduttori, quindi, risulta essere un gran vantaggio in termini di costi, affidabilità e riduzione della grandezza fisica del motore o anche dello stesso azionamento. E’ chiaro che questa eliminazione comporta che l’azionamento includa una tecnica alternativa in grado di stimare la posizione e la velocità rotoriche: questi azionamenti vengono definiti azionamenti sensorless. Negli ultimi anni la ricerca ha proposto diverse soluzioni di tipo sensorless che permettono la stima della posizione, diversificando per`o le tecniche per la regione di funzionamento in alta velocità da quelle in bassa velocità o a rotore fermo. Al giorno d’oggi, stimatori basati sulla ricostruzione del vettore di flusso o della fem (stimatori MRAS) vengono utilizzati per il primo caso, mentre nel secondo caso vengono utilizzati stimatori basati sulla iniezione di tensione ad alta frequenza. Mentre nel primo caso la tipologia di stimatore può essere applicata sia ai motori di tipo isotropi che con quelli anisotropi, la seconda tipologia di stimatore può essere applicata solo a motori anisotropi, visto che sfrutta la salienza magnetica per estrarre la posizione elettrica. Questa tesi verte appunto su queste due tipologie di stimatori, riassumendo in dettaglio i principali algoritmi utilizzati oggigiorno e implementandoli sia a livello simulativo che a livello sperimentale. Per una trattazione completa di questo argomento, vengono anche studiate le tre più comuni configurazioni rotoriche (a PM Interni, a PM a montaggio Superficiale ed Inset (incassati)) con una particolare attenzione verso quello che è il comportamento anisotropo o isotropo della macchina stessa e la possibilità di applicare uno o l’altro degli algoritmi sensorless descritti. Entrando in maggior dettaglio, per quanto riguarda lo stimatore MRAS, dopo una sua descrizione, viene presentato in una particolare applicazione che si riferisce ad un catamarano ibrido. Vengono quindi affrontate e discusse le problematiche legate alla strategia di partenza del motore tramite rampa di velocità, dell’aggancio sulla posizione stimata, dell’inversione di marcia. Inoltre viene studiata la sensitività dello stimatore che si dimostra dipendere dall’induttanza di statore e non dalla resistenza. Invece per quanto riguarda lo stimatore basato sull’iniezione di segnali ad alta frequenza è stato per prima cosa descritto sia nel caso con iniezione nel sistema di riferimento statorico sia in quello rotorico. Lo studio è stato effettuato con una formulazione di tipo generale, adattata poi per il tipo di iniezione di segnale effettuata. La trattazione tiene conto anche della induttanza differenziale mutua e questo ha permesso di ricavare un legame tra l’errore di stima la induttanza mutua stessa. Vengono presentati inoltre tre diversi schemi per l’estrazione della posizione elettrica: mediante regolatore PI, osservatore a due stati ed osservatore a tre stati. Dopo di che, lo stimatore con iniezione nel sistema di riferimento rotorico è stato testato sia in simulazione che su banco prova. La bontà dell’algoritmo di stima è stata provata su motori con due diverse configurazioni rotoriche: a PM Interni e di tipo Inset. L’induttanze diretta, in quadratura e mutua sono state studiate in dettaglio con il supporto di simulazioni agli elementi finiti (FEM). Grazie a questo studio è possibile prevedere l’errore di stima che verrà poi confrontato con quello ottenuto dalle prove sperimentali. Come detto in precedenza lo stimatore ad iniezione di segnale può essere utilizzato solo con quei motori che presentano una salienza magnetica. Da questa categoria quindi sono esclusi i motori SPM che, salvo alcune eccezioni come l’Inset, sono isotropi. Si è quindi pensato a come indurre in questi motori un comportamento anisotropo solo alle alte frequenze, cioè alle frequenze del segnale iniettato per la stima. In questa tesi viene presentata questa nuova configurazione rotorica definita "Ringed-pole". Questa consiste nella realizzazione di una gabbia di rotore inserendo degli anelli di rame cortocircuitato attorno a ciascun magnete permanente. La soluzione permette di andare a modificare alle alte frequenze il comportamento magnetico dell'asse diretto, mantenendo invariato quello di quadratura. In questo modo si viene a creare un comportamento anisotropo appunto alle alte frequenze, mantenendo però il comportamento isotropo della macchina per le basse frequenze. Questa caratteristica permette quindi di sfruttare lo stimatore basato sull'iniezione di tensioni alle alte frequenze, per la stima di posizione anche nel caso di motori SPM isotropi. Sono state eseguite simulazioni FEM e prove sperimentali per validare l’idea di base e provare l'effettiva possibilità della stima di posizione. Un secondo contributo riguarda la presentazione di un nuovo stimatore basato sulle armoniche di corrente causate dalla modulazione PWM. L'idea di base consiste nel pensare che la modulazione PWM effettui una intrinseca iniezione di tensione ad alta frequenza, più precisamente alla frequenza di switching. Queste tensioni inducono delle armoniche di corrente alla stessa frequenza che contiene l'informazione sulla posizione elettrica. L'informazione può essere estratta mediante uno schema di stima simile a quello che viene utilizzato nella normale iniezione di tensione. E' stata quindi effettuata una trattazione matematica per ricavare le espressioni delle componenti di tensione e di correnti alla frequenza di switching. Sono state eseguite delle simulazioni preliminari per confermare la correttezza dell’idea di base.
Johansson, Andreas y Max Stigborg. "Analogue versus digital solution for motor control". Thesis, Tekniska Högskolan, Högskolan i Jönköping, JTH, Data- och elektroteknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-21574.
Texto completoSaab använder idag ett analogt system för att driva små motorer i deras flygfarkoster. Det analoga systemet använder en borstlös DC-motor och en resolver för styrning av motorn. Motorstyrning med system som är oberoende av givare är ett område som vuxit och fått ett ökat intresse det senaste decenniet. Saab överväger möjligheten att använda ett givarlöst digitalt system beroende på dess styrprestanda jämfört med deras analoga system. Eftersom det finns lite dokumentation om prestandan så är frågan som ska besvaras i denna rapport: Hur förhåller sig det givarlösa digitala systemet prestandamässigt jämfört med det existerande analoga systemet? Detta besvarades genom att leta upp ett komplett system på marknaden och sedan jämföra dess prestanda mot ett digitalt system som liknar det analoga systemet. Prestandamässigt så fungerar InstaSPIN som representerar det givarlösa systemet inte lika effektivt som EPOS2 som representerar systemet som använder givare. Nackdelarna med InstaSPIN är att den behöver en startsekvens, inte kan köra på lika låga hastigheter, har längre stigtid, insvängningstid och större rippel. Man bör undersöka mjukvaran innan nackdelarna används som en anledning till att inte använda ett givarlöst system. Speciellt startsekvensen bör undersökas eftersom det är IntaSPINs största svaghet jämfört mot EPOS2.
Okumus, Halil Ibrahim. "Improved direct torque control of induction machine drives". Thesis, University of Bristol, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364958.
Texto completoOkuma, Shigeru, Shinji Doki y Takumi Ohnuma. "Extended EMF Observer for Wide Speed Range Sensorless Control of Salient-pole Synchronous Motor Drives". IEEE, 2010. http://hdl.handle.net/2237/14475.
Texto completoBu, Jianrong. "High performance rotor position sensorless control of switched reluctance machines over a wide speed range /". The Ohio State University, 1998. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487949836205613.
Texto completoMaalouf, Haddad Amira. "Sensorless control of brushless synchronous starter generator including sandstill and low speed region for aircraft application". Thesis, Cachan, Ecole normale supérieure, 2011. http://www.theses.fr/2011DENS0008.
Texto completoAujourd'hui, l'aviation est en train de vivre des évolutions technologiques concernant surtout l'attribution de différentes fonctionnalités aux équipements électriques et ceci au détriment d'équipements hydrauliques et mécaniques assurant les mêmes fonctionnalités.Dans le cadre de l'avion plus électrique, le démarrage électrique sans capteurs mécaniques de la turbine de l'avion préoccupe les avionneurs de nos jours. Les problèmes introduits par ce capteur ont été identifiés : problèmes de coût et de poids, problèmes de fiabilité et d'intégration.Ce travail présente alors une commande sans capteurs pour la machine synchrone à trois étages à utiliser durant le démarrage électrique de l'avion. Ceci est réalisé avec trois méthodes de détection de la position selon la vitesse de rotation, basées sur :- l'injection d'un signal à haute fréquence- l'utilisation d'un filtre de Kalman étendu FKE- les fém. du PMG (Permanent Magnet Generator) La première méthode donne de bons résultats d'estimation depuis l'arrêt jusqu'à 8% de la vitesse nominale de la machine. Au-delà de cette vitesse, es valeurs des fém. du PMG deviennent assez élevées pour être utilisées dans l'estimation de la position. De bons résultats sont obtenus à moyenne et haute vitesse.Pour des questions de redondance, le FKE est aussi utilisé. Ainsi, la position estimée peut être fournie par l'un des deux algorithmes à moyenne et haute vitesse.L'implémentation de ces algorithmes est réalisée via une carte FPGA étant donné que celui-ci garantit un temps d'exécution. La rapidité de traitement garantit une estimation de la position quasi-instantanée et donc n'introduit pratiquement pas des retards dans l'estimation
Rashed, Mohamed El-Sayed. "Design and implementation of sensorless vector and direct torque control induction motor drives for low speed operation". Thesis, University of Aberdeen, 2002. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU602300.
Texto completoLi, Jingchuan. "Adaptive sliding mode observer and loss minimization for sensorless field orientation control of induction machine". Columbus, Ohio : Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1132428071.
Texto completoMorales, Caporal Roberto. "Encoderless predictive direct torque control of the synchronous reluctance machine at low and zero speed". Aachen Shaker, 2007. http://d-nb.info/988798077/04.
Texto completoSimsek, Gunay. "Sensorless Direct Field Oriented Control Of Induction Machine By Flux And Speed Estimation Using Model Reference Adaptive System". Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12604965/index.pdf.
Texto completoindirect and direct field oriented. The field to be oriented may be rotor, stator, or airgap flux-linkage. In the indirect field-oriented control, the slip estimation based on the measured or estimated rotor speed is required in order to compute the synchronous speed. There is no need for the flux estimation in such a system. For the direct field oriented case the synchronous speed is computed with the aid of a flux estimator. In DFO, the synchronous speed is iv computed from the ratio of dq-axes fluxes. With the combination of a flux estimator and an open-loop speed estimator one can observe stator-rotor fluxes, rotor-flux angle and rotor speed. In this study, the direct (rotor) flux oriented control system with flux and-open-loop speed estimators is described and tested in real-time with the Evaluation Module named TMS320LF21407 and the Embedded Target software named Vissim from Visual Solutions Company.
Chang, Chia-Ming y 張家銘. "An Adaptive Speed Sensorless Induction Motor Drive for Zero Stator Frequency Control and Simultaneous Estimation of Multi-Parameters". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/55950099210851801189.
Texto completo國立臺灣科技大學
電機工程系
98
This research proposes control methods to achieve the goal of very low speed and zero stator frequency operation for a speed sensorless vector-controlled induction motor drive. The speed estimation is first formulated using a full-order rotor flux observer and an adaptive speed estimator. It is further improved by a phase shift technique and by an injection of a low-frequency signal. Then a model reduction technique is proposed, which reduces the computational complexity of the control algorithms and is still applicable to zero stator frequency operation. Furthermore, this research proposes a new MRAS approach due to solve the problem of motor parameter sensitivity, the estimators for rotor speed, stator resistance, and rotor resistance can be simultaneously set up, which lead to a multi-input multi-output cross-coupled dynamic system. To achieve simultaneous estimation of the three estimators, a stability criterion is established and a systematic design procedure is proposed. Experimental results are divided into two phases, the first one is presented to show the validity of the proposed methods in such driving modes as zero stator frequency, reversible speed, and zero rotor speed control. Finally, the simultaneous estimation system of three estimators is further verified by experiments, which show that the proposed control strategy stabilizes the drive in both motoring and regenerating modes.
Lee, Che-Ming y 李哲銘. "Speed Sensorless Control of Induction Motor". Thesis, 1998. http://ndltd.ncl.edu.tw/handle/64791497222125832985.
Texto completo國立臺灣大學
電機工程學系
86
This dissertation presensts a new sensorless speed estimation method for induction motor, which replaces the feedback signal of conventional speed sensors. Using the proposed method, closed-loop speed control is accomplished without any speed measurement. The proposed method is based on an adaptive flux observer, in which a second-order Kalman filter is employed to modify the esitmated rotor flux using the actually measured stator currents. The modified rotor flux estimate is substituted into the speed estimation equation derived in the adaptive observer to improve the speed estimation results. In comparison with the reduced-order Kalman filter method, the proposed method reduces the computation complexity. Moreover, the proposed method improves the accuracy of speed estimation compared with the conventional adaptive observer, while maintaining the computational load moderate. In the experimental implementation, vector control and direct torque control are investigated to verify the effectiveness of the proposed speed and flux observer. With the proposed method, speed sensorless control of induction motor is achieved. Experimental results shwo that the proposed speed estimation scheme improves the accuracy of speed estimation compared with the conventional adaptive observer. The proposed method is proven to be an effective speed sensorless control strategy of induction motor with moderate computational load.
Li, Chun-Wei y 李俊緯. "Speed Sensorless Microp Controller Design for Home-use Treadmills Speed Control". Thesis, 2013. http://ndltd.ncl.edu.tw/handle/84512989925465797373.
Texto completo國立高雄應用科技大學
電機工程系博碩士班
101
The thesis proposes the design of speed control by using a simple microprocessor. Our design does not have either a speed sensor or the relevant circuit, which is often used to detect the speed of motors. The microprocessor merely measures the voltages of the motor terminals as well as the motor current and is then able to estimate the speed of the permanent magnet DC brushed motor based on the mathematical model of motors. This greatly reduces the cost and space required. Microchip PIC16F1827 is used as the central processing unit. The main control approach is based on a bang-bang control algorithm. It adjusts the duty cycle of PWM (Pulse Width Modulation) in order to maintain and stabilize the required speed of treadmills. The system also keeps monitoring on exceptions due to improper usage or any accidents for safety. At the end, the thesis implements a PIC-based sensorless speed regulation control unit and connects it to a treadmill and justify its feasibility.
Kuo, Ei-Lang y 郭益郎. "Speed Sensorless Vector Control of Induction Motor Driver". Thesis, 2000. http://ndltd.ncl.edu.tw/handle/58682933314356013189.
Texto completo淡江大學
機械工程學系
88
The objective of this thesis is to develop a sensorless speed estimator for induction motor drives. From the state equations of the induction motor, we derive the estimation algorithm of which inputs include stator currents and voltages, and rotor flux. In order to reduce the hardware burden, only currents of two phases are measured by using hardware sensors, while the voltages and rotor flux are determined by using software estimates. For the voltage estimation, we utilize the PWM switching states that are created by a DSPC240 controller. On the other hand, a voltage model observer is used for the rotor-flux observation. Because of the insignificant variation of parameters in high frequencies, the voltage model is usually applied in high-speed operation. For the situation of low-speed operation, we propose a compensation method for the flux command. Therefore the zero-crossover speed will be quite smoothly. There are many advantages to measure currents, voltages, and rotor flues by using estimates. We can filter out the external noise by the software estimates and increase the robustness of the system. Furthermore, the omission of the hardware sensor will simplify the system mechanism and reduce the cost price. With the estimated rotor speed, we can form a closed-loop velocity control system that will provide larger torque outputs in low-speed operation than those by a pure V/F control. We develop the servo-controller by using TI DSPC240 to implement the sensorless speed control algorithm. The control command is sent to a power drive made by ITRI, which would regular the motion of an 1-HP induction motor. Experimental results show that the proposed estimates can efficaciously provide the rotor speed in various operational situations.
Chuang, Chao-Chin y 莊朝欽. "PSoC-based Sensorless Speed Control Design for Treadmill". Thesis, 2013. http://ndltd.ncl.edu.tw/handle/59288611259062937580.
Texto completo國立高雄應用科技大學
電機工程系博碩士班
101
The thesis mainly focuses on the implementation of a sensorless motor control design for a treadmill. In order to control the speed of the treadmill in a stable fashion, the design estimates how fast the PMDC motor turns by combining the measurements of the current flowing through the motor and motor terminal voltages. To estimate the best membership function of the speed calculation equation and accurately approximate the speed, the estimator is based on fuzzy modeling and the least squares analysis. The controller also implements a fuzzy PID loop to control the speed of the PMDC brushed motor to effectively regulate the speed of the treadmill. At the end, the results of design and experiments are realized by programming a PSOC micro-controller to prove its validity.
Hsu, Chih-Hung y 徐誌鴻. "Control of Speed Sensorless Permanent-Magnet Synchronous Generators". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/18253491669391151773.
Texto completo國立臺灣科技大學
電機工程系
98
This thesis presents the control of speed sensorless permanent-magnet synchronous generators. In this system a novel ac-dc-ac power converters is proposed to convert three-phase electrical power generated by wind with varying-voltage and varying-frequency to that of single-phase with constant-voltage and constant-frequency. In ac-dc power converter, the mathematical model of three-phase rectifier built under rotating-frame and synchronous frame phase-locked loop is used to estimate rotor position. This requires no rotor position detector and thus increases the reliability of the system. Wind power generation system with maximum power tracking control perturbation and observation method is proposed to observe the changes in generator output power and make adjustments to current orders for the next duty cycle. A single-phase dc-ac power converter using unipolar switching method with low switching loss is designed to reduce the output current harmonics and increase conversion efficiency. As mentioned above, the realized system can be operated in parallel with the power grid by voltage and current control models. The high-performance and low-cost digital signal processor DSP,TMS320F2808 is used to control the power converter. When generator runs at 90rpm, a prototype of 465W power conversion system is developed for grid-connection. The single-phase grid-connected operation yields the output voltage of 220V, 60Hz. Besides, the experimental data show that the efficiency of the whole system reaches 86.11% with current harmonic distortion of 13.77%. This generator can maintain a stable output voltage to provide a single-phase DC-AC power converter and grid-connected operation when speed is running between 10m/s to 12m/s. Experimental results are shown to verify the feasibility of the proposed scheme.
Lai, Chang-Tien y 賴昶典. "EKF-based Speed-sensorless Control of Induction Motor". Thesis, 2018. http://ndltd.ncl.edu.tw/handle/ern997.
Texto completo國立臺灣科技大學
機械工程系
106
AC motor have become popular in the industries globally due to the booming of vector control. Among them, induction motors(IM) have a wide range of applications because of its sturdiness and durability. To reduce the expenses and to open more possibilities on its application speed-sensorless control is preferred. However, in applying speed-sensorless control efficiently an observer is needed. The noise immunity and real time estimation ability of Extended Kalman filter(EKF)-based observer lead to a popular application in field of speed-sensorless control. This thesis utilize EKF based estimator and FOC as the controller in order to completed the speed-sensorless control. The experimental results show that the FOC has good control performance, and can maintain the zero steady error and the RMSE within 6 rpm under the designed operating conditions of constant speed variable loading and variable speed constant loading. The convergence efficiency of the estimator is acceptable. The convergence time of speed and load in 1.5 seconds, the Maximum of the steady state error is also less than 0.1%. The control performance of EKF-based speed-sensorless control works well. The Maximum of steady state error of the speed is less than 1.5% and the RMSE within 30 rpm. Due to the estimator delay and the maximum overshoot of the controller, the estimation of the rotational speed change and the control performance are not so well.
Wang, Hong-Ru y 王洪儒. "SHAFT SENSORLESS SPEED CONTROL OF PERMANENT MAGNET SYNCHRONOUS MOTORS". Thesis, 1996. http://ndltd.ncl.edu.tw/handle/79281001509739992462.
Texto completoChang, Ying-De y 張英德. "Intelligent Control of High-Speed Sensorless DC Brushless Motor". Thesis, 2006. http://ndltd.ncl.edu.tw/handle/91660712395754464813.
Texto completo國立交通大學
電機與控制工程系所
95
In this thesis, the fuzzy logic controller (FLC) for sensorless brushless dc (BLDC) motor was proposed to synchronize the rotors with the stator windings commutation sequence to obtain the optimum efficiency of motor. There are two modules proposed in the speed control of BLDC motor, i.e. command and regulating modules. Command module is to find and issue commutation period and PWM duty cycle to the BLDC motor for desired speed. The regulating module is designed as a FLC and is used to regulate the speed of BLDC motor subject to disturbances, such as loading effect. Two resistances are adopted to detect the back-EMF signal on the unexcited phase instead of using the expensive Hall sensors. The regulating module can accurately and quickly regulate the PWM duty cycle by fuzzy reasoning which makes the BLDC motor rotate smoothly at desired rotational speed even if there is an external disturbance. In order to reduce the computational load of real-time FLC for the microcontroller C8051F330, we can perform the FLC computation off-line to cover nearly all cases. These data will be recorded and organized as a Look-Up Table (LUT). The regulating module is designed by FLC yield the better results than that without regulating module, and the regulating module via P controller.
Lin, Yih-Neng y 林意能. "Parameter Measurement and Speed Estimation for Sensorless Vector Control". Thesis, 1998. http://ndltd.ncl.edu.tw/handle/51508273740126972368.
Texto completo國立臺灣大學
電機工程學系研究所
86
This dissertation presents the automatic parameter measurement and adaptive reduced-order flux observer for sensorless field-oriented controller(FOC) of a n inverter-driven induction motor(IM) to effectively improve the controller pe rformance.In order to improve the preset parameters of the sensorless FOC, a novel approach of automatic IM parameter measurement is presented. Before sta rt-up, the inverter drive automatically performs the dc test, the no-load test (including iron loss under various frequencies), and the locked-rotor test for the driven IM. The only measured values are input current signals. No addit ional hardware is required in this approach. Finally, the test data are then computed to get the IM parameters and the field current commands under various frequencies for FOC.In order to improve the performance of sensorless FOC, a n adaptive reduced-order flux observer is presented. In comparison with the a daptive full-order flux observer, the proposed method consumes less computatio nal time and illustrates better speed performance. The proportional gain of t he proposed observer can be utilized for wide speed range control. Simulatio n and experimental results both show the effectiveness, correctness and accura cy of the proposed methods. An integrated study of the proposed methods has b een tested on a 3-hp inverter-driven IM system.
Lin, Ting-Jhou y 林庭州. "Sensorless Speed Control for Surface Permanent Magnet Synchronous Motor". Thesis, 2018. http://ndltd.ncl.edu.tw/handle/39b5nc.
Texto completo國立臺北科技大學
電機工程系電力電子產業碩士專班
106
The sensorless control strategies for PMSM drives mainly include high frequency (HF) injection and position observer based on motor model. The information of rotor position depends on the inductance difference between q axis and d axis for low speed. Due to the saliency ratio of SPM is relatively small, it’s hard to estimate the rotor position by the characteristics of inductance. A sensorless speed control is proposed in this thesis. The phenomenon of current rise caused by the saturation of inductance, when the rotor magnet is approaching to the stator coil, is utilized as the detection basis at standstill. To identify the state of the six current vectors and their magnitudes under 180 degree conduction, thereby the rotor position is estimated at standstill. Then, the 120 degree commutation is applied for low speed operation. The magnetic saturation occurs when the rotor magnet is close to the excitation stator windings, therefore the open phase winding will yields an electromotive force due to the change of magnetic flux. The current commutation of six-switches is according to detect the open phase voltage within six switch states. Finally, a DSP-based(TMS320F28035) motor drive is built to verify the effectiveness of the proposed strategy with a 350W/6000rpm SPM.
SHUMING, LIU y 劉書銘. "Brushless DC Motor Sensorless Speed Control with Back-EMF Detection". Thesis, 2011. http://ndltd.ncl.edu.tw/handle/2ey7w4.
Texto completo國立臺灣科技大學
電機工程系
99
This thesis aims to implement the sensorless speed control system for brushless direct current (BLDC) motor with the Field Programmable Gate Array (FPGA) chip. It could determine the position of rotor according to the information of back electro motive force (back-EMF) without Hall sensor. This system use the analog to digital converter (ADC) to detect the back-EMF zero crossing points, then commute the motor. But the estimation for zero crossing points would be easily interfered by noise signals.The interference with noise could be reduced with some suitable decision rules.So this system could detect the zero crossing points correctly. And let the motor spins smoothly.
Chung, Tao-Hung y 鍾道宏. "An Implementation of Induction Motor DSP Speed Sensorless Control System". Thesis, 2003. http://ndltd.ncl.edu.tw/handle/95024374979361171223.
Texto completo國立臺灣大學
電機工程學研究所
91
In this thesis, a DSP speed sensorless vector control system of three-phase induction motor is the principal implementation. The author adopts the direct vector control for an induction motor drive system. The rotor flux is estimated by a modified voltage model observer. A close loop control system is constructed by a speed observer which estimates the rotor speed. In the case of a PWM modulation method, the space vector modulation is well utilized in the speed sensorless vector control system and makes the lower harmonic losses with respect to SPWM. To evaluate the performance of the control system, simulations were carried out using the MATLAB/SIMULINK software package in addition. The full system is implemented with the TI TMS320F2407A EVM board, peripheral circuits and assembly language programming. The proposal of this thesis which links the hardware, simulation results and the experiment results were presented.
Wang, Sheng-Yao y 王聖堯. "DSP-based Sensorless Speed Control for Permanent Magnet Synchronous Motor". Thesis, 2005. http://ndltd.ncl.edu.tw/handle/27712072137443576480.
Texto completo南台科技大學
電機工程系
93
This main research of this thesis is to develop an intelligent sensorless speed controller for permanent magnet synchronous motor (PMSM) using the TI-TMS320F2812 DSP. In sensorless technique, a sliding mode observer and a low-pass filter is utilized to estimates the back-EMF of the PMSM, then the magnetic angle and rotor speed of the motor is obtained using the estimated back-EMF value. These estimated values are feedback for vector control in the current loop and for speed control in the speed loop. To increase the performance of the speed controller, an adaptive fuzzy controller consisted by a fuzzy controller, a reference model and adjustable mechanism is applied and the rules of the fuzzy controller can be updated in real time by adjustable mechanism. Combined the sensorless technique and adaptive control technique into the speed controller of the PMSM drives, and the performance can be improved, the cost can be reduced and the reliability can be increased. The DSP chip used in the thesis has the complete motor peripheral which includes 12 channels of PWM output, 2 set of QEP input, 12 channels 12-bit A/D converter and 56 bits GPIO, and, therefore it is very suitable for develop a fully digital AC motor drives which need to perform the functions of the intelligent controller, coordinate transformation, SVPWM output, QEP detection, vector control and magnetic angle estimating method. At last, an experimental system, based on TI TMS320F2812 DSK board, is set up and some experimental results are proven the correctness and validity of the proposed control algorithm.
Fu, Ping-Yuan. "Sensorless Speed Tracking Control for Permanent Magnet Synchronous Motor Systems". 2008. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0020-1808200813224200.
Texto completoFu, Ping-Yuan y 傅秉元. "Sensorless Speed Tracking Control for Permanent Magnet Synchronous Motor Systems". Thesis, 2008. http://ndltd.ncl.edu.tw/handle/38672442297761298751.
Texto completo國立暨南國際大學
電機工程學系
96
At present, lots of permanent magnet synchronous motors (PMSM) are commonly utilized in modern industries. Synchronous AC motors could be simply classified as PMSM and brushless DC motors according to sinusoidal or trapezoidal flux distribution, respectively. The advantages of a PMSM include superior high power density, large torque to inertia ratio and high efficiency, so it has been widely employed for many industrial drives. The vector control scheme can decouple the system dynamics of PMSM on various reference frames and it can apply current feedback control to track the reference rotor velocity. First of all, the nonlinear control design of PMSM systems is considered, and the proposed methodology incorporates the sliding mode algorithm to track the rotor speed. In addition, the nonlinear speed tracking controller is developed for a PMSM system based on adaptive sliding mode approach to cope with system uncertainties. So far, these nonlinear control designs are attained with the assumption of measurable rotor speed. In general, the PMSM speed tracking design requires the measurement of angular velocity to achieve control goals, but most PMSM systems do not have speed measurement devices. Therefore, the nonlinear backstepping controller with observer, which is employed to estimate the unmeasurable angular velocity, is proposed to achieve speed tracking control. Furthermore, if the system cannot have velocity observer and system parameters are unknown, the sensorless speed tracking control design without observer is developed for a PMSM system based on adaptive backstepping design scheme. As a result, the excellent performance of the nonlinear controller design scheme can be illustrated through comparative simulations applied to a PMSM.
CHEN, LIU DE y 陳侶德. "Sensorless Speed Control of Transverse Flux Linear Switched Reluctance Machine". Thesis, 1996. http://ndltd.ncl.edu.tw/handle/14825998040682470683.
Texto completo國立中山大學
電機工程研究所
84
This thesis will provide a sensorless like position measurement scheme applied onto a transverse flux linear switched reluctance machine system. A simple and compact closed-loop scheme will be developed to handle the system position and speed estimation tasks. It is understood that except those operating regions which are designed for machine starting and breaking, the entire linear machine system will be generally operated in a smooth speed condition. Consequently, with the installation of minimized number of position sensors and the implementation of some sophisticated estimation algorithms, the machine system behavior can then be identified. From the system verification results, it is believed that the objective of developing an economical and fast position estimation scheme, suitable for long distance transportation system using linear machine, has been achieved.
WANG, TING-WEI y 王廷瑋. "Sensorless Speed Control of PMSM Using Low-Frequency Signal Injection". Thesis, 2018. http://ndltd.ncl.edu.tw/handle/xyv5p3.
Texto completo國立中正大學
機械工程系研究所
106
This thesis mainly builds up the permanent magnet synchronous motor sensorless vector control technology. The permanent magnet synchronous motor can be divided into two types: surface-mounted and interior-mounted. Because of the saliency of motor, we have to choose different sensorless control technology for different types of motors. In this thesis, surface-mounted permanent magnet synchronous motor is used for DSP controlled target. In low speed command situation, we utilize low-frequency signal injection (LFSI) method for surface-mounted permanent magnet synchronous motor to perform sensorless control. Because of the back EMF of the motor, this method can only be used in low speed command situation. In high speed command situation, we use model reference adaptive control system (MRAS), which is self-adaptive sensorless control technology and it performs well in high speed command situation. For the stability when changing sensorless control technology for different speed commands, we adjust the control parameters to improve the dynamic response. We use MATLAB Simulink to identify the result, and use TMS320F28379 digital signal processor (DSP) motion control card to carry out the sensorless motor control.
Fu, Tianjun. "Speed-sensorless torque control of induction motors for hybrid electric vehicles". Thesis, 2005. http://spectrum.library.concordia.ca/8686/1/MR10263.pdf.
Texto completoWu, Hsin-Ta y 吳欣達. "Sliding mode estimator design for sensorless BLDC motor in speed control". Thesis, 2005. http://ndltd.ncl.edu.tw/handle/ugdcg5.
Texto completo國立交通大學
電機與控制工程系所
93
Owing to the high power density and high efficiency, BLDC motors have been used in various applications, such as the computer peripheral machines, household appliances, industrial machines and public transit systems. In general, the information of the motor’s position is required in controlling the BLDC motor. However, some drawbacks exist. For instance, the motor size and cost will be raised and the position censor will be influenced by the motor temperature inside. Therefore, recent investigators have paid more and more attention to sensorless MLDC motors, which can be operated without any position sensors. A 3-phase BLDC axial-flux wheel motor is used in this thesis. It is a low speed and high torque direct-drive motor. The goal is to design the sliding mode estimator for sensorless BLDC motor in speed control. The motor’s model is established by Matlab®�{Simulink® at the beginning. Next, the sliding mode estimator is designed and added upon the speed feedback control. Finally, the hardware experiment is set up to verify the method proposed in this thesis. The whole design process will be proposed in detail in this thesis.
Lai, Chiu-Ming y 賴秋名. "The Speed Control of Sensorless Brushless DC Motor Using Fuzzy Controller". Thesis, 2009. http://ndltd.ncl.edu.tw/handle/u4n53h.
Texto completo崑山科技大學
電機工程研究所
97
This thesis proposes the fuzzy controller to the speed control of sensorless brushless DC Motor (BLDC) based on digital signal controller dsPIC30F4011. The BLDC mainly uses inverter to substitute for carbon brush and commutator. Under the incentives of both energy and environmental protection, BLDC will substitute for DC motor and will become the drive component of high-efficiently environment-friendly product. In general, the BLDC can be divided into sensor drive and sensorless drive techniques. The sensor drive technique uses Hall sensors to detect rotor position, which can be successfully started up whenever motor is static or operated at low speed condition. But due to the installation of Hall sensors, the motor size is large and the cost is increased. The sensorless drive technique employs back electromotive force (BEMF) signals to detect rotor position, which can improve the disadvantages of sensor drive technique. To carry out the close-loop speed control, this thesis applies fuzzy theory to design a controller which can accommodate the response of load variation. Fuzzy controller can make a good control whenever the system is nonlinear or its mathematical model is unknown. Therefore, the fuzzy controller is widely used in the industrial circles. To verify the feasibility of the proposed method, this thesis employs three-phase brushless DC motor (1.5Hp) to fulfill the experiments. The proposed method utilizes start-up experiment to validate the feasibility of BEMF method. Then the fuzzy controller is employed to verify the control performance under different speed commands with load variation.