Adaptive sliding mode modular permanent magnet synchronous machine efficiency optimal cooperative control based on improved ring coupling

Large-scale mechanical equipment frequently use modular motor technology to reduce power redundancy. In multi-module motors, improved efficiency and precise synchronous control are essential for energy conservation and system stability. In this paper, we propose an adaptive sliding mode modular permanent magnet synchronous machine (MPMSM) efficiency optimal cooperative control based on improved ring coupling. An efficiency optimal control (EOC) is established to determine the efficiency optimization instruction. A multi-module adaptive sliding mode control (ASMC) cooperative control based on improved ring coupling is developed to achieve precise synchronous control. An improved ring coupling control aims to establish the ring coupling relationship between modules while introducing error compensation to mitigate synchronization errors resulting from module coupling. An ASMC with an adaptive reaching law is designed to address the issues of friction, parameter variations, and load disturbances in single-module operation, therefore significantly improving speed tracking accuracy by real-time adjustments of the reaching law gain. Subsequently, the integration of EOC with cooperative control can autonomously regulate the number of operational modules to improve efficiency while significantly reducing synchronization error. Simulation and experimental findings indicate that the proposed technique markedly improves operational efficiency, realizing a 4.28 % improvement under light load conditions. In comparison to other approaches under different conditions, the control system demonstrates superiority in robustness, synchronization error suppression, and dynamic convergence speed. This research provides a novel control technique for achieving high efficiency and precision in the synchronous control of MPMSM.