Abstract
In order to solve the problem of tension control in the actual unwinding process of the lithium battery diaphragm slitting machine, the dynamic model of diaphragm and slitting machine unwinding system is constructed in this paper based on the diaphragm deformation in the unwinding system during the sampling period, in view of the nonlinear system characteristics of the unwinding system and the unstable diaphragm tension caused by the uncertain interference and the inaccurate model in the unwinding process. Considering the unwinding system characteristics of multi-output and strong coupling between outputs, a multi-variable comprehensive sliding surface for balancing unwinding diaphragm tension and unwinding speed, and a sliding mode controller for controlling the diaphragm tension in unwinding process are designed. And the stability of the sliding surface and the controller is proved. The fault-tolerant improvement of the sliding mode controller is carried out for practical engineering application, and the differential tracking disturbance observer is proposed to quickly estimate and compensate the external disturbance of the system. Finally, the results of the comparative experiments verify the effectiveness of the proposed diaphragm tension control scheme.
Highlights
Lithium batteries play a significant role in the new energy field, and one of whose key inner components is the diaphragm
The quadratic term of the linear velocity and the timevarying R1(t) make the unwinding system a variableparameter nonlinear system, which increases the complexity of the diaphragm tension control
Where j3 is the gearing ratio between the motor shaft and master speed roll shaft, ω3 is the angular velocity of master speed roller, τ3 is the electromagnetic torque of master speed motor, b3 is the coefficient of friction in the master speed roll shaft, J3 is the inertia of all elements on the master speed roll that is converted to the master speed motor shaft, T3 is the diaphragm tension on the underside of the main speed roller, Md3 is the damping torque that is converted to the master speed motor shaft
Summary
Lithium batteries play a significant role in the new energy field, and one of whose key inner components is the diaphragm. C. Jiang et al.: Sliding Mode Compensation Control for Diaphragm Tension in Unwinding Process of LBDSM. In [16], an observer with friction and inertia compensation was presented, which enables sensorless measurement and control of web tension of web-winding systems. A disturbance observer based approach for web tension control of roll-to-roll processing was proposed in [17]. Reference [19] estimates the web tension that is considered to be disturbed by the disturbance observer, develops an iterative learning sliding mode controller. The experimental results show that the fault-tolerant sliding mode controller (FSMCDTDOC) with differential tracking disturbance observer compensation has good control performance on the diaphragm tension in the unwinding system. The quadratic term of the linear velocity and the timevarying R1(t) make the unwinding system a variableparameter nonlinear system, which increases the complexity of the diaphragm tension control
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