Yawing mechanism for wind driven generator, yawing control system and control method

Abstract

The invention relates to a yawing mechanism for a wind driven generator, a yawing control system adopting the yawing mechanism and a control method of the yawing mechanism, wherein the yawing mechanism of the wind driven generator comprises a pedestal and a four-point-contact ball bearing, wherein the pedestal is connected with a generator assembly, and three bulged lateral plates are arranged onthe outer lateral wall of the pedestal; a pretightening-pressure regulating device is fixed below each lateral plate; the other end of a yawing motor is fixed to a speed reducer, and the output shaftof the speed reducer is connected with a friction wheel; and the bottom end surface of the pedestal is fixed to the inner ring of the four-point-contact ball bearing, the outer ring of the four-point-contact ball bearing is connected with the top of a tower frame, and the friction wheel contacts the outer ring of the four-point-contact ball bearing. Compared with the prior art, relative to the common gear driving form of the yawing mechanism, because a friction-wheel driving form is adopted, the invention has the advantages of simple structural shape and convenient processing and has the characteristics of steady working process and small impact.

Description

technical field [0001] The invention relates to a yaw mechanism of a wind power generator, a yaw control system using the yaw mechanism, and a control method of the yaw system. Background technique [0002] At present, there are two types of yaw mechanisms commonly used in wind turbines: motor drive and hydraulic drive. For the motor-driven yaw mechanism, its structure is simple and reliable, and it can make full use of the limited space to realize decentralized arrangement. Usually, three motors are used to drive three driving gears respectively, and the inner or outer circle of the four-point contact ball bearing is made The gear is used to complete the yaw action through the meshing transmission of the driving gear and the gear on the four-point contact ball bearing. The disadvantage is that due to the large size of the four-point contact ball bearing, it is difficult to process the tooth profile. At the same time, the impact of the gear meshing transmission is relativel...

AI Technical Summary

Problems solved by technology

The disadvantage is that due to the large size of the four-point contact ball bearing, it is difficult to process the tooth profile. At the same time, the impact of the gear meshing transmission is relatively large. If the manufacturing or installation is not good, the gear teeth will be partially broken when the local load is too large. and other phenomena

The hydraulic drive mode has a large variable pitch force, but the hydraulic transmission system is complex, non-linear, and leaking.

At the same time, the current control method of the yaw system often adopts PID control. Due to the complexity of the wind power generation system, the establishment of the system model is very difficult, and the yaw system cannot be accurately controlled.

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