Cascade speed regulation refers to the speed regulation formed by the two-stage connection of DC motors attached outside the rotor, although it was later improved to replace DC motors with static power electronic converter devices and transformers, but the term cascade speed regulation is used.Three-phase asynchronous motorCascade speed regulation is to change the motor slip by adding adjustable additional potential into the rotor loop of a winding motor to achieve the purpose of speed regulation.

       becauseThree-phase asynchronous motorMost of the slip power is absorbed by the additional potential in the string, and additional devices are used to return the trapped slip power to the grid or convert it into energy for utilization. According to the absorption and utilization of slip power, cascade speed regulation can be divided into motor cascade speed regulation, mechanical cascade speed regulation and thyristor cascade speed regulation. Most thyristor cascade speed regulation is used. Its characteristics are: the slip loss in the process of speed regulation can be returned to the power grid or the production machinery, and the efficiency is high;

       This speed regulation mode is suitable for speed regulation range at rated speed70％－90％On the production machinery, when the speed regulating device fails, it can be switched to full speed operation to avoid stopping production; More suitable for fans, water pumps and rolling machines, mine elevator, extrusion machine.

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