The three-phase AC self-regulating speed motor do not use high-power electron device, has non exterior additional speed-regulating equipment and does not bring pollution.
三相交流自调速电动机不使用大功率电子器件，也没有外部附加的调速设备，不产生污染电网的谐波。
2
This invention provides a set of self-powered mechanical device, an auto-regulating movable weir-plate, a back-flushing buffer and lift-pull valve.