To use frequency variation to regulate the speed of navigation lock gate, reducing the gate crush due to improper position of the position limit switch and enabling the lock gate more stable in speeding up and down. 在船闸闸门调速中采用变频调速,减轻了闸门因限位开关位置不当等原因造成闸门碰撞,使闸门运行中加减速更加平稳。