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Implementation of sliding mode controller for linear synchronous motors based on direct thrust control theory

Implementation of sliding mode controller for linear synchronous motors based on direct thrust control theory

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Permanent magnet linear synchronous motors (PMLSMs) are a type of linear synchronous motors that are widely used in motor control applications. However, in PMLSMs, the accuracy of position control is easily affected by variations in its parameters and load disturbances. In this study, the implementation of a direct thrust control (DTC) method by using a modified integrator for flux estimation is proposed. The proposed algorithm can be used to obtain accurate flux magnitudes and phase angles of the controlled motors. The sliding mode control (SMC) method is a well-established control method used in non-linear systems because of its robustness. The authors use DTC along with SMC to construct a motor control system. The advantage of the proposed approach is that the control system behaviour can be tracked easily. The authors conducted simulations and experimental studies, and the results obtained agreed well.

Inspec keywords: position control; nonlinear control systems; variable structure systems; linear synchronous motors; machine control; robust control

Other keywords: direct thrust control theory; flux estimation; permanent magnet linear synchronous motors; nonlinear systems; position control; linear synchronous motors; sliding mode controller

Subjects: Linear machines; Multivariable control systems; Nonlinear control systems; Stability in control theory; Control of electric power systems; Synchronous machines; Spatial variables control

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