The Variable frequency Speed regulation Three phase Asynchronous Motors (VSD) are special three-phase asynchronous motors powered by variable-frequency speed-regulating devices. The system composed of these motors and the variable-frequency devices can achieve stepless speed regulation, thereby achieving the goals of energy conservation and automated control.

The VSD series motors feature a squirrel-cage structure and use special Class B and Class C anti-corona enameled wires. This effectively prevents inter-turn short-circuits in the windings caused by the peak voltage generated by the frequency converter, ensuring more reliable operation and convenient maintenance. The motors are equipped with independent axial-flow fans to ensure good cooling performance at different rotational speeds.