Overview controlled brushless motor soft starter is starting resistance directly mounted on the motor shaft, use the centrifugal force generated by the rotation of the motor as a power to control the size of the starting resistance, to reduce motor starting current, to increase the starting torque, so that the winding achieve controlled brushless induction motor running device. It mainly consists of the chassis, starting fluid, moving plate, spring, terminal, safety valve, exhaust valve, etc.. The starter has a starting current, starting torque, automatically adapt to changes in the power supply and the load to protect the motor and so on. Widely used in metallurgy, machinery, petroleum, chemical, mining, building materials, paper, rubber, water plants, power plants and other industrial areas, ball mill, crusher, fan, water pump, beater, air compressors, rolling mill, hot mill, oxygen machines and other motor Transmission Equipment wound rotor induction motor starting. It can replace the motor winding slip rings, carbon brushes starting device. SUMMARIZE It is to install the starting resistance on rolling shaft of motor.using the centrifugal power as driving, control the starting resistance to reduce the starting current, increase torque, equipping the no brush self-controlled motor to winding asynchronous motor. It is composed of shell, starting liquid, moving magnetic boad, spring, connecting pillar, safety valve, exhausting valve etc. the starter has the advantage at small current, large starting torque, adjustable the change to power and load so as to, protecting the motor. it can be widely used to start the winding asynchronous motor in ball miller, crusheruser, blower fan, pump, beater, comprssor, crusher, defibrater, oxygenerator e