Abstract
The paper is concerned with designing an effective controller for a linear tubular homopolar (LT-H) motor type. The construction and operation of the LT-H motor are first described in detail. Then, the motor model is represented in the direct-quadrature (d-q) axes in order to facilitate the design of the control loops. The designed control system consists of two main loops: the current control loop and velocity adaptation loop. The determination of the regulator’s gains is accomplished through deriving and analyzing the transfer functions of the loops. To enhance the system’s robustness, a robust variable estimator is designed to observe the velocity and stator resistance. Different performance evaluation tests are performed using MATLAB/Simulink software to validate the controller’s robustness for variable-speed operation and load force changes as well. The obtained results reveal the appropriate dynamics of the motor thanks to the well-designed control system.
Highlights
The invention of linear motors dates back to about a century ago, about 50 years after the advent of rotating machines; their development and use were not very widespread due to difficulties with their construction techniques at that time
The control of a linear tubular homopolar (LT-H) motor type is rare in the literature, and to investigate more about this type, the current paper introduces a detailed analysis for the control-system design of the LT-H motor type
In order to test the effectivity of the designed sensorless control scheme, the tests were carried out in different manners using MATLAB/Simulink
Summary
The invention of linear motors dates back to about a century ago, about 50 years after the advent of rotating machines; their development and use were not very widespread due to difficulties with their construction techniques at that time. With technology improvements since the end of the 1970s (especially in high-speed-rail transport systems) has interest in the linear motor and its use increased [1,2]. A second aspect that makes it particular is the presence of an air gap, which in some types reaches considerable dimensions, and precludes or prevents the possibility of obtaining high values of efficiency [3]. Another peculiarity is represented by the presence of an attractive or repulsive force that manifests itself in a direction perpendicular to the direction of the motion, which
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