1. Reduce the starting current impact: In some cases where the grid current impact needs to be limited, by applying weak magnetic field, the current impact of the motor when starting can be reduced, the impact on the grid and equipment can be reduced, and the stability of the electrical system can be protected.

2. Reduce the starting torque: For some applications that need to minimize the torque impact during the starting process, such as the scenario where the mechanical impact generated during the starting is small, the weak magnetic function can be used to gradually increase the torque, start smoothly, and protect the mechanical transmission system.

3. Reduce the starting power demand: The weak magnetic function can help reduce the power demand when the motor starts, especially for high-power motors or limited power supply conditions, which can reduce the impact on the grid and electrical equipment and improve the energy efficiency of the system.

4. Prevent overload protection from being triggered: In some cases, the motor may be restricted by the overload protection during starting. By applying weak magnetic field, the load of the motor during starting can be reduced, the triggering of overload protection can be avoided, and the safe operation of the motor and the system can be protected.