International Journal of Applied Electromagnetics and Mechanics - Volume 25, issue 1-4

Authors: Kozek, Martin | Lorenz, Andrea | Kampas, Philipp

Article Type: Research Article

Abstract: Detailed mathematical model of a DC servo drive is established and validated by measurements. Due to battery power supply, a pulse-width modulated (PWM) voltage signal, and a microcontroller with low sampling rate (typical for embedded systems) a comprehensive switched non-linear description results. Linear and sliding-mode controllers (SMC) are designed for the drive. Robustness with respect to parameter variations and measurement noise is investigated by simulation. In contrast to many other reports the linear …controller outperforms the SMC because of the given restrictions in control input and sampling time. Show more

Keywords: DC servo motor model, position control, pulse-width modulation, embedded system

DOI: 10.3233/JAE-2007-845

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 25, no. 1-4, pp. 521-527, 2007

Authors: Kozek, Martin | Hametner, Christoph

Article Type: Research Article

Abstract: A new method for identifying Hammerstein/Wiener models is proposed, where the non-linear characteristic is modelled by a piecewise linear function and the linear dynamic part is represented by a linear transfer function. The parameters of the overall model are estimated by recursive least-squares (RLS), therefore enabling the algorithm to be implemented on-line. Using appropriate validity functions the edges of the piecewise linear characteristic may be smoothed out in order to achieve a better fit. An adaptive …algorithm for optimal partitioning of the local linear models is also proposed on the basis of statistical analysis. Using the new approach an efficient and accurate model can be identified. Show more

Keywords: Hammerstein and Wiener model, recursive identification, nonlinear parameter estimation, prediction intervals

DOI: 10.3233/JAE-2007-860

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 25, no. 1-4, pp. 529-535, 2007

Authors: Hamida, Amel Hadri | Allag, Abdelkrim | Mimoune, Souri Mohamed | Srairi, Kamel | Zerouali, Sakina | Féliachi, Mouloud

Article Type: Research Article

Abstract: In this paper an adaptive nonlinear control strategy applied to a passively clamped two switch quasi resonant DC link converter is developed and simulated. First a nonlinear system modelling is derived with state variables of the input current and the output voltage by using power balance of the input and output. The system is linearized and decoupled, and then a state feedback law is obtained. For robust control to parameter perturbation, adaptive nonlinear control is introduced …to the system. The simulation is provided to verify the validity of the control algorithm. Show more

Keywords: Adaptive nonlinear control, quasi resonant DC link converter, feedback linearization, induction heating

DOI: 10.3233/JAE-2007-792

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 25, no. 1-4, pp. 537-542, 2007

Authors: Erkan, Kadir | Koseki, Takafumi

Article Type: Research Article

Abstract: A nonlinear fuzzy modelling and control strategy, having merits of linear control theory and TSK (Takagi-Sugeno-Kang) reasoning algorithm of fuzzy logic, is proposed for active vibration control systems under maglev actuation and the effectiveness of the approach verified via comparative experimental results.

Keywords: Active vibration control, fuzzy control, magnetic levitation, disturbance observer

DOI: 10.3233/JAE-2007-840

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 25, no. 1-4, pp. 543-548, 2007

Authors: Kashiwabara, Ken | Oshinoya, Yasuo | Ishibashi, Kazuhisa

Article Type: Research Article

Abstract: We have developed a noncontact guide system for a high-speed travelling elastic steel plate in which electromagnetic forces are given at the edges of the plate by actuators for position control of the plate. In position control of the endless plates, it is extremely difficult to determine the mass of the control target. We study how the suppressive effect of the sliding mode control theory gives robustness in mass variation. In applying the sliding mode control …theory, it is necessary to get quick response of the current control of the actuator in order to get the matching condition. With the help of the current feedback, the coil inductance of the actuators is forced to become almost zero. Show more

Keywords: Travelling elastic steel plates, noncontact guide, electromagnet, sliding mode control theory

DOI: 10.3233/JAE-2007-882

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 25, no. 1-4, pp. 549-552, 2007

Authors: Tada, Kiyokazu | Torii, Susumu

Article Type: Research Article

Abstract: The magnetic levitation system does not hurt thin steel plate. The system for conveyance is constructed by a lot of electromagnets and gap sensors. Because of these many sensors, expense and space are required. Therefore, the introduction of sensorless control with observer is significant. The sensorless system is not always stable when the coil resistance changes slightly by room temperature change. This study examines the design method of voltage-controlled and current-controlled observer for constructing a robust …sensorless system. This paper describes the experiment with the model of voltage-controlled observer. Then, the availability of the model is evaluated by the experiment. Show more

Keywords: Magnetic levitation, thin steel plate, sensorless, observer

DOI: 10.3233/JAE-2007-883

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 25, no. 1-4, pp. 553-558, 2007

Authors: Nagaya, Kosuke | Saito, Masato | Kobayashi, Kazuya | Murakami, Iwanori

Article Type: Research Article

Abstract: A simple and stable flywheel system with high temperature superconducting levitation is presented that needs no control for levitation. The drive system consists of eight-poles cylindrical permanent magnet and eight cylindrical coils, in which magnetic forces in the direction perpendicular to the shaft axis are cancelled. Hence, vibration force due to the driving is zero in this system. A coil-type electromagnetic damper is also presented which works in the magnetic field of levitation permanent magnet. The …dampers lie at both ends of the shaft. Using this system, a control like the sensorless control can be performed by using coils only. The control method has been presented and analytical expressions are also obtained for vibrations of the shaft. To validate the analysis, experimental tests have been carried out. Show more

Keywords: Superconductor, levitation, flywheel, vibration control, damper, motor

DOI: 10.3233/JAE-2007-896

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 25, no. 1-4, pp. 559-564, 2007

Authors: Zerouali, Sakina | Allag, Abdelkrim | Mimoune, Souri Mohamed | Srairi, Kamel | Hamida, Amel Hadri | Féliachi, Mouloud

Article Type: Research Article

Abstract: An extended Kalman filter and a discrete time adaptive linear quadratic regulator for uninterruptible power supplies are presented. On the control strategy design, the gains are determined by minimizing a cost function which reduces the tracking error and the control signal. An extended Kalman filter identifies and estimates the plant parameters and the unmeasured state variables respectively at different load conditions.

Keywords: UPS systems, adaptive control, extended Kalman filter, non-linear loads

DOI: 10.3233/JAE-2007-791

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 25, no. 1-4, pp. 565-569, 2007

Authors: Luo, Yun | Higa, Masaru | Okuyama, Takeshi | Takagi, Toshiyuki

Article Type: Research Article

Abstract: The authors propose a novel concept for less invasive hemostatic forceps. The proposed hemostatic forceps employ superelastic shape memory alloys that enable one to maintain the clamping pressure within a safe range. In this paper, the basic design of these hemostatic forceps is described. The validity of the concept is demonstrated by experimental results using a prototype.

Keywords: Shape memory alloy, superelasticity, atraumatic hemostatic forceps, less invasiveness

DOI: 10.3233/JAE-2007-748

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 25, no. 1-4, pp. 571-576, 2007

Authors: Kim, Ki-Chan | Ju Lee, Ki-Chan

Article Type: Research Article

Abstract: The ventilation hole in the core of the inverter driven induction motor with high power, small size and light weight, should be designed for improving cooling capacity. In this paper, the analysis method by FEM in designing ventilation holes is presented by considering the magnetic saturation effect due to ventilation holes.

Keywords: Effect on the inverter control, traction motor for railway, variation of the input voltage, ventilation hole design

DOI: 10.3233/JAE-2007-793

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 25, no. 1-4, pp. 577-581, 2007