Abstract
This paper proposed a non-contact tension testing device using magnetic levitation technology. To guarantee the alignment of the top and bottom tension forces, the magnetic characteristics of three shapes of floators were investigated via electromagnetic analysis, and it was decided to choose a special conical floator according to the electromagnetic analysis results. Also, the number of the coil turns, the dimensions of the EMs and fixtures were minimized while ensuring sufficient magnetic force. Furthermore, a mathematic model was built for the device and an active disturbance rejection control strategy was proposed based on the mathematic model. Moreover, control simulations were performed to verify the feasibility of the control strategy. Ultimately, the control simulation results demonstrated that the control strategy had the ability of mismatch tolerance and allow the device withstand the disturbances caused by the tension force.
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