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access icon openaccess Non-singular terminal sliding mode adaptive control of permanent magnet synchronous motor based on a disturbance observer

This is an open access article published by the IET under the Creative Commons Attribution-NonCommercial-NoDerivs License (http://creativecommons.org/licenses/by-nc-nd/3.0/)
Received 26/11/2018, Accepted 04/12/2018, Published 21/01/2019

This study proposes a non-singular terminal sliding mode adaptive control strategy based on a disturbance observer for a permanent magnet synchronous motor (PMSM) with multiple disturbances. Firstly, the multiple disturbances of the PMSM can be divided into two types including a load disturbance formulated by an exo-system, modelling error and circuit noise represented by a norm-bounded equivalent disturbance. Secondly, a disturbance observer is applied to estimate the load disturbance and its derivative. A non-singular terminal sliding mode controller based on the disturbance observer and an adaptive controller is designed to reject the modelled disturbance and compensate the norm-bounded disturbance. Then, the stability of the controlled system is proved by the Lyapunov method. Finally, simulation results of a PMSM control system are provided to verify the effectiveness.

Inspec keywords: control system synthesis; permanent magnet motors; Lyapunov methods; machine control; adaptive control; synchronous motors; stability; observers; variable structure systems

Other keywords: adaptive controller; disturbance observer; controlled system; PMSM control system; multiple disturbances; norm-bounded disturbance; nonsingular terminal sliding mode controller; permanent magnet synchronous motor; equivalent disturbance; modelled disturbance; nonsingular terminal sliding mode adaptive control strategy; load disturbance

Subjects: Stability in control theory; Synchronous machines; Nonlinear control systems; Multivariable control systems; Self-adjusting control systems; Control of electric power systems; Control system analysis and synthesis methods

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