Papers by Author: Maciej Henzel

Abstract: The bearingless systems are a key technology in many power mechatronic applications. The topic of the paper reports the original, very relevant and very timely research. The methods of numerical and experimental testing of the bearingless induction motor, presented in the paper revised, are convergent with the directions of up-to-date research in this domain.

Abstract: The paper deals with analysis of bearingless electric motor with surface-mounted permanent magnets. This kind of electric motor eliminate disadvantages of conventional motors, e.g. overall efficiency, friction forces, heat abstraction. In paper are shown mathematical analysis of bearingless motor and experimental investigation results of them. There are shown results of analysis of magnetic flux density distribution in bearingless motor by finite element method, too. This kind of motor was elaborated and investigated in Military University of Technology.

Abstract: Passive magnetic bearing with Halbach array is presented in this paper. The array uses permanent magnets with radial and axial magnetization to augment the magnetic field on one side of the array and cancel it on the other side. The design of the bearing consists of ring-shaped magnets of 60x70 mm and 75x85 mm with different orientation of magnetization. The designed passive magnetic bearing has air gap of 2.5 mm, stiffness 129297 N/m and maximal value of load 200 N. The bearing ensures magnetic levitation and stabilization of rotor in a work point. The paper presents the design of the passive magnetic bearing as well as the experimental setup together with investigation results.

Abstract: Highly maneuverable aircraft has redundant electrohydraulic actuators that generate the forces to drive the aircraft control surfaces. Two problems are important in these actuators. First, during reconfiguration of the actuator channels the hydraulic system works in the full range of its parameters. It leads to strongly nonlinear models of the redundant servo. Second, the frequency bandwidth of elements, which are located in the feedback loop of the servo, should be as wide as possible. Therefore, it is necessary to choose proper control method for actuator, where the controller of control system adjusts the set point signal. The advanced control methods can ensure the new quality of the systems. The new, advanced methods can cope with such problem in practical applications. There are available: adaptive methods, predictive methods, etc. and first of all, the robust control methods. These methods are robust on external disturbance. The causes of disturbances are very different: the inaccuracy in the mathematical and simulation model, the change of the operation point, the weather and temperature conditions, etc. We have designed such models in the Matlab/Simulink environment and we divided the full actuator into small subsystems.