Abstract
In industrial manufacturing system, there exists an urgent demand for dual-motor drive system running at the same speed. This paper adopts a parallel structure to design dual-permanent magnet synchronous motor (PMSM) system with a global fast terminal sliding mode control (GFTSMC) technique optimizing speed tracking performance of dual-PMSM servo system. For each PMSM system, a GFTSMC strategy is introduced. Compared with common sliding mode control strategy, this strategy avoids chattering phenomenon in that it does not contain switching terms. Also, it can make the output speed reach the reference value in finite time, along with a shorter convergence time and a better tracking precision. Since external disturbances may cause the speed difference between two motors, a speed synchronization controller is designed to enhance their synchronization by compensating error between speeds of two motors. Considering the complexity of control laws, S-function in MATLAB is adopted to design the GFTSMC. The validity and robustness of the hybrid scheme are verified by MATLAB simulations.
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