<p class="R-AbstractKeywords"><span lang="EN-US">Bearingless synchronous machine (BSM) is an electrical machine which rotor is suspended by electromagnetic forces (not ball bearings). It allows achieving ultra-high rotation speed and significantly extending area of electric drive application. Nowadays there are different variants of the machines with the structural design and the searching of optimal solution is going on.</span></p><p class="R-AbstractKeywords"><span lang="EN-US"> The basic calculation parameters of bearingless machines are radial forces that can withstand the rotor from external load and torque produced on the shaft. This article describes the theoretical results based on a computer model that produces the finite element method and experimental study of the BSM prototype.</span></p>
In this article, one type of bearingless electrical machine, a synchronous reluctance bearingless machine (SRBM), is considered. A simplified analytical description of the static characteristics of the SRBM nodule has been derived. A control law for the suspension current phase has been proposed. The validity of the derived equations was verified by numerical calculations by the finite element method. The radial electromagnetic forces of the module are described by linear dependences on the magnitude of the suspension currents and the displacement of the rotor in the corresponding radial direction. The dependence of the forces on the displacement in the perpendicular direction is simplified. The analytical model displays high accuracy of calculations in the operating ranges of the currents and displacements. The principal component of the SRBM torque is a square-law function of the drive current magnitude. The error of the torque prediction according to the analytical model was 1.8% with the rotor in the central position and no current in the suspension winding within the entire range of the current values at any torque angles. The graphs presented in the article show the impact of the suspension current and the rotor displacement on the torque. The control law proposed for the suspension current phase is a linear function of the rotation angle of the rotor, the radial displacement direction, and the torque angle of the synchronous machine drive. The proportionality ratio between the torque angle and the suspension current phase has been determined approximately. The error of calculation at different rotor displacements has been assessed and plotted.Keywords: synchronous reluctance bearingless machine, mathematical model of control object, direction and magnitude of radial force
The article is devoted to the application of neural network methods and genetic algorithms in solving problems of controlling an electric drive of an active magnetic suspension. The method of rolling moment for eliminating an imbalance is considered. The scheme of the neural network controller and the curves of the transients in the open single-mass electromechanical system and in the system c of the neurocontrollers are presented.
Active magnetic bearing is the electromechanical device allowing to suspend the rotor of the electric machine. Friction is eliminated and high speed of rotation can be achieved. However, the parameters of the electromechanical system may change during operation. Adaptive control system allows to maintain stability under varying parameters.
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