Soft starting device of extra large motor

The utility model provides a soft starting device of an extra large motor, which belongs to the technical field of electromechanical control. The soft starting device solves the problem that in the prior art, when the short-circuit capacity of a low voltage power network of the extra large motor is small or under the condition that the generator capacity is less than 1.5 times the motor capacity, the motor cannot be smoothly started. The soft starting device of the extra large motor comprises a frequency converter which controls the rotation speed and the torque of the motor, a contactor, a fuse, a reactor and a controller which realizes power frequency synchronous switch. The input end of the controller is connected with a touch screen which is used for motor parameter manual input. The output end of the controller is connected with the frequency converter. The frequency converter is connected with the motor. The soft starting device of the extra large motor can automatically adjust the output frequency and