Abstract: Based on lots of maintenance workload on scraper conveyor in coal mine, and it couldnDt work long hours in the low speed mode, the paper proposed th e application of technology and scheme of inverter in scraper conveyor. Through the detection of motor current of scraper conveyor, the paper realized the dynamic pow er balance, reduced the damage probability of the motor, the chain and scraper, analyzed the change process of the current and speed when scraper chain broken, and designed the protection function of frequency converter. Through the site test of No.52303 coal face in Shendong Daliuta Coal Mine, inverter which had the functions of low speed and heavy load start, broken chain protection, low maintenance and others, which had the advantages of high efficiency, energy saving, high stability, and so on.