The YD series variable pole multi speed three-phase asynchronous motor is a type of three-phase asynchronous motor that achieves speed conversion by changing the number of magnetic poles in the stator winding. It belongs to a single winding variable pole multi speed motor (which achieves multi speed through different wiring methods of a set of windings). Its characteristics are simple structure, reliable operation, convenient speed regulation, and can operate at multiple speeds to meet the speed requirements of different working conditions. Widely used in departments such as machine tools, mining, metallurgy, textiles, printing and dyeing.