Direct drive type volume control variable-pitch system of wind-driven generator

The invention provides a direct drive type volume control variable-pitch system of a wind-driven generator which relates to the technical field of a blower variable-pitch system in order to solve the technical problems that the feathering response speed is ensured and the cost is reduced at the same time. The variable-pitch system comprises an energy storage loop and a pitch blade pump control loop, wherein the energy storage loop comprises a liquid-control safety valve, an energy storage pump motor, an energy storage pump, an oil storage accumulator, a high-pressure accumulator and a quick closing magnetic valve; the pitch blade pump control loop comprises a servomotor, a variable-pitch oil cylinder, a two-way pump and five liquid-control one-way valves; the variable-pitch oil cylinder is used for driving the pitch variation of pitch blades of the wind-driven generator, and the servomotor is used for controlling the operation of the variable-pitch oil cylinder by the two-way pump, thereby controlling the nor