A global sliding-mode control (GSMC) scheme with input constraint is presented in this article. The scheme offers a measure to weigh the contribution between GSMC and the nominal dynamics so that the chattering level and the maximal control effort can be reduced based on an on-line tuning of the weight on GSMC. A moving sliding function is adopted on the control design, the input can thus be confined within a predefined boundary during transient period, while a robust performance can be guaranteed in the steady state. The efficacy of this scheme is further validated via implementation on a linear variable reluctance motor (LVRM) servo system. Both simulation and experimental studies further demonstrate its feasibility and effectiveness.