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| This paper proposes a novel continuous non-singular terminal sliding mode (NTSM) control scheme for permanent-magnet synchronous motor (PMSM) speed system with unknown load torque. Utilizing the concept of relative degree, a continuous NTSM control method is proposed and applied to the decomposed speed and current double closed-loop vector control system, which features of finite-time convergence property proved by the comparison with the commonly used super-twist algorithm and second-order NTSM method. Meanwhile, a Luenberger observer is designed to estimate the unknown load torque. Simulation results shows that the proposed control scheme possesses the advantages of fast transient responses, no over-shoot and resistance to load disturbances.????? |
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| Keywords:Permanent-magnet synchronous motor, non-singular terminal sliding mode, finite-time convergence, chattering????? |
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