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Permanent magnet track linear motor drives are used in numerous industrial manufacturing processes covering a wide range of material handling and conveyor applications. A traditional solution is a permanent magnet linear motor (PMLM) in which the stationary part consists of permanent magnets and the moving part of the armature. To further reduce the initial costs of such a permanent magnet track linear...
This paper studies an online nonparametric identification method that is based on a time-frequency representation of signals using Kalman filter. The method utilizes swept excitation signal by synchronizing the Kalman filter to the frequency of the excitation signal generator and updating the filter gains on a sample-by-sample basis. Four different closed loop identification configuration are studied...
Tooth belt drives with directly connected permanent magnet servo motors are mechanically very flexible systems, and the resonances of the system change significantly as function of cart position and load. This paper addresses issues in identification of a linear tooth belt-drive with limited stroke. Particular attention is paid to detecting the changes in the system dynamics. This is achieved by using...
Usage of a magnetic circuit model as part of a dynamic simulation model of a non-salient permanent-magnet linear synchronous motor drive is investigated. The complete dynamic system model includes position control, motor magnetic circuit and mechanical models. A dynamic motion profile is simulated to demonstrate the dynamical capability of the simulation method proposed. To validate the simulation...
A sensorless positioning method for a non-salient permanent magnet linear synchronous motor is presented in this paper. The control method combines an open-loop current angle rotation method to the back-EMF estimator method. The open-loop current angle rotation method is used at low velocities and the back-EMF method at higher velocities. The position accuracy is defined by the open-loop current angle...
Mathematical modeling as well as design of proper process controllers for web handling systems requires knowledge of the system dynamics or observations from an actual system. The dynamic behaviour of a web handling system is defined by the interactions between a flexible web, rollers and electric drives. In this paper, offline-identification of a web transport subsystem is considered. The identification...
Tension and conveyance in web-handling machines should be controlled accurately to ensure high product quality. Unlike typical web handling applications, the motions in discontinuous web transport process are typically fast, and thus, dynamically more demanding. Conveying the web in a discontinuous way brings new performance requirements for position and tension control. In this paper, a simple control...
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