There are three control modes of wound motor + reducer. The first control mode is wound motor series frequency sensitive resistance or water resistance; The second control mode is winding motor with metal resistance; The third control mode is winding motor cascade speed regulation.

The first control mode has no speed regulation function, and the motor can not be started frequently. It is generally used on the ultrafine vertical mill with the length of more than 500m and the motor can not be started frequently.

The second control mode has no speed regulation function, but the motor can be started frequently. With SCR power brake, it is a common driving mode for the downward transport of ultrafine vertical mill.

The third control mode has the function of speed regulation, which can be used as closed-loop control. It is generally used in large-scale ultrafine vertical mill with the length of more than 1000m and the function of speed regulation is required.