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Öğe Experimental investigation of input-output characteristics of a travelling-wave ultrasonic motor(Springer, 2008) Bekiroğlu, Erdal; Bal, GüngörSpeed, position and load characteristics of the ultrasonic motor is considerably influenced from the input characteristics such as driving frequency, magnitude and phase difference of phase voltages. Input and output characteristics of a traveling-wave ultrasonic motor have been investigated from the experimental point of view in the present study. For this aim, a half-bridge serial-resonance inverter based drive system has been designed and then implemented. The inverter is featured with pulse width modulation and pulse frequency modulation techniques. The frequency, amplitude and phase angle of two-phase sinusoidal output of the driver has been designed to be changed for the control purpose. Then the measuring circuits and tools have been set up to obtain required measurements. Input characteristics such as duty ratio of control signal-dc reference voltage, dc reference voltage-driving frequency and output characteristics such as driving frequency-rotor speed, driving frequency-feedback voltage, phase voltage-rotor speed are obtained from the experiments. Also load characteristics are studied with experiments. Afterwards these characteristics are discussed in details. This study gives a systematical experimental approach in order to demonstrate operating and control principles and characteristics of the travelling-wave ultrasonic motor.Öğe Fuzzy logic based DSP controlled servo position control for ultrasonic motor(Pergamon-Elsevier Science Ltd, 2004) Bal, Güngör; Bekiroğlu, Erdal; Demirbaş, Şevki; Çolak, İlhamiIn this paper, position control of an ultrasonic motor was implemented on the basis of fuzzy reasoning. A digitally controllable two phase serial resonant inverter was developed to drive the ultrasonic motor by using a TMS320F243 digital signal processor. The driving frequency was used as a control input in the position control loop. The position characteristics obtained from the proposed drive and control system were demonstrated and evaluated by experiments. The experimental results verify that the developed position control scheme is highly effective, reliable and applicable for the ultrasonic motor.Öğe A highly effective load adaptive servo drive system for speed control of travelling-wave ultrasonic motor(Ieee-Inst Electrical Electronics Engineers Inc, 2005) Bal, Güngör; Bekiroğlu, ErdalThis paper presents a highly effective load adaptive drive system to control the speed of a travelling-wave ultrasonic motor. The motor driver was built based on the two-phase high-frequency inverter using the. mechanical resonant frequency of the ultrasonic motor. To digitally control the drive system, a TMS320F243 digital signal processor was adapted to the driver. The developed system includes two feedback loops; speed control loop and feedback voltage-resonant frequency tracking loop. The driving frequency was used as a control input to control the motor. Direct pulse-width modulation (PWM) control was used to obtain the required driving frequency. The developed drive system was experimentally tested under several operating conditions. The obtained results demonstrated the effectiveness of the drive system for high performance drive applications.Öğe Implementation of indirect vector control to induction motor with zero current transition inverter(Ieee, 2009) Bal, Güngör; Öztürk, Nihat; Bekiroğlu, ErdalIn this study, the speed control of the vector controlled induction motor was implemented by using hard switching and soft switching inverters. A TMS320F243 digital signal processor was used to implement control algorithm during practical implementation. With the use of the vector control, complex structure of the controller is simplified, and dependence to variations of the motor parameters is reduced. In order to reduce switching losses arising mainly from hard switching method a soft switching method was designed and implemented. Switching signals of the auxiliary switches are independent from main switching signals in the proposed method. The method can be applied to the puls width modulation (PWM) inverter by setting up proper switching strategies.Öğe Investigation of switching losses for sinusoidal PWM zero current switching inverter and resonant link inverter(Ieee, 2009) Bal, Güngör; Öztürk, Nihat; Bekiroğlu, ErdalIn this study, simulations of two methods used for minimizing the switching losses occur in DC/AC inverters with PWM that is used extensively because of its high power density, fast response and control facility were carried out. First method which can be applied easily is the resonant link inverter. The other one is the resonant transition zero current switching inverter, which employs two auxiliary switches and LC resonance tank to assist switching transitions. In the study, sinusoidal PWM was used for gate signal. Switching signals are generally produced in consequence of comparing the carrier and reference signals. These Inverters do not require any modification on conventional sinusoidal PWM scheme. Both inverters were simulated based on ORCAD's actual device models. They were operated under the same conditions and the switching losses were analyzed. The results obtained show that the efficiency of the inverter with zero current transition method is considerably higher.Öğe Microcontroller based digitally controlled ultrasonic motor drive system(Springer, 2008) Bal, Güngör; Bekiroğlu, Erdal; Bayındır, Ramazan; Uzel, HasanPiezoelectric driven ultrasonic motors have been attracted as considerable actuators for the servo speed and position applications in recent years. These motors have important features and advantages to be preferred in the special movement applications. Ultrasonic motors have different operating principles and different drive and control systems than the electromagnetic motors. In this study, microcontroller based digitally controlled drive system has been proposed for a travelling-wave ultrasonic motor. Drive system includes power circuit, interface electronics circuits and microcontroller parts. Power circuit is combined from half-bridge serial-resonance inverter to provide highfrequency two-phase voltages. Interface circuits include gate drive, direction control, opto-coupler and filter circuits. Microcontroller is programmed to generate required digital control signals for overall control of the motor. Related to the reference speed, the microcontroller generates control signal resulting proper driving frequency. Consequently, the actual motor speed tracks the reference speed precisely. The speed feedback is taken from optical encoder and transmitted to the controller as digital speed and position signals. The developed drive system has been tested experimentally. The obtained results show the effectiveness and reliability of the proposed system. The microcontroller based drive system can be applied easily and successfully to the ultrasonic motor.Öğe A PWM technique for DSP controlled ultrasonic motor drive system(Taylor & Francis Inc, 2005) Bal, Güngör; Bekiroğlu, ErdalIn this study, a PWM technique is presented for digital signal processor controlled drive system of travelling-wave ultrasonic motor. The drive system is high-frequency two-phase serial-resonant inverter using mechanical resonant frequency of the ultrasonic motor. A TMS320F243 digital signal processor was used to control ultrasonic motor drive system. PWM signal was generated and then applied to the low pass filter to produce reference DC voltage level for speed control of ultrasonic motor. The driving frequency was selected as control input in the speed and position control loops. Experimental results show that the proposed drive and control system gives superior steady-state and transient performances in the speed and position control of ultrasonic motor.Öğe Yürüyen dalga tip ultrasonik motor denetimi ve bilgisayarla izlenmesi(2006) Bal, Güngör; Bekiroğlu, Erdal; Bayındır, Ramazan; Görgün, AlperBu çalışmada yürüyen dalga tip ultrasonik motorun hız denetimi mikrödenetleyici ile gerçekleştirilmiş ve bilgisayar ekranında görsel hale getirilmiştir. Motoru sürmek için sayısal olarak kontrol edilebilen bir sürme sistemi geliştirilmiştir. Hız bilgisi motor miline bağlı 500 darbe/devirlik artımsal devir algılayıcı ile elde edilmiştir. Gerilim ve faz farkı büyüklüklerini okumak amacıyla yüksek frekansta işlem yapabilen bir dönüştürücü devresi tasarlanmıştır. Bilgisayar ile sürücü devre arasındaki bağlantı ve iletişimi sağlamak ve işlenen verilerin değerlendirmesini yapmak amacıyla PIC 16F877 tip bir mikrödenetleyici kullanılmıştır. Bilgisayar ile görsel bir denetim ve izleme özelliği sağlamak amacıyla Visual Basic 6.0 programı ile birara yüz geliştirilmiştir. Motorun yük ve çalışma koşulları değişimlerindeki tepkisi deneysel olarak incelenmiş, gerçek hız değerleri ile sistemden elde edilen tahmini değerler karşılaştırılmıştır. Bu çalışma ile motorun bilgisayarla otomasyonu gerçekleştirilerek esnek denetim sağlanmıştır. Çalışma bu özelliği ile eğitim amaçlı olarak kullanılabilme avantajına sahiptir. Sunulan denetim sisteminin yürüyen dalga tip ultrasonik motorun hız denetiminde ve izlenmesinde etkin sonuçlar verdiği deneysel verilerle orsaya konmuştur.
