What's the white thing next to the motor? What's the role?

Shangyu Dongxing is good at reducing motor, which should be a metallurgical lifting motor, hydraulic brake at the back end and ZSY series reducer at the front end. Metallurgical and hoisting motors are externally connected with starting resistors, so that the motors can start smoothly. Therefore, the starting resistor in this box is outside the rotor winding.