Advantages: excellent soft starting performance, linear controllable speed curve when starting, linear controllable speed curve when stopping, good electric braking performance, stepless speed change, excellent controllable performance, closed-loop control, high reliability.Disadvantages: the price is very expensive, electric control equipment covers a large area, the current single power is more than 400KW, no explosion-proof type, can not be used in coal mines.Based on the above analysis of the advantages and disadvantages of various driving devices of vertical roller mill, when selecting the driving device of vertical roller mill, we can make the best choice according to the site, production and other specific conditions.