High-speed heavy-load working condition variable-pressure mechanical braking method and large-megawatt wind motor mechanical braking system
A technology for mechanical braking and heavy-duty working conditions, which is applied in the control of machines/engines, wind turbines, and wind power generation. Small rigid impact, finer and smoother braking effect
Pending Publication Date: 2019-07-30
DALIAN JIAOTONG UNIVERSITY
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Problems solved by technology
If the friction reaction force f' of the brake is lower than the rated force F, the brake performance will be wasted and the braking time will be delayed; if the friction reaction force f' of the brake exceeds the rated force F, the stiffness or strength limit may be exceeded , damage the brake components and shorten the service life
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[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0034] The embodiment of the present invention discloses a variable pressure mechanical braking method under high-speed and heavy-load conditions, which includes the following steps:
[0035] S1. Judging the braking working condition by reading the rotational speed of the main shaft during braking. The braking working condition includes emerg...
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The invention provides a high-speed heavy-load working condition variable-pressure mechanical braking method capable of adjusting the braking pressure according to different working conditions and a large-megawatt wind motor mechanical braking system. The method comprises the steps that the braking working condition is judged by reading the rotating speed of a main shaft during braking, if the braking working condition is judged to be an emergency braking working condition, an electric adjusting valve is controlled to adjust the braking pressure, and a friction value transmitted by a pressuresensor is kept in a stable interval; and if the pressure value is judged to be a common working condition, the electric adjusting valve is controlled to adjust the braking pressure, and the friction value transmitted by the pressure sensor is kept to be gradually increased from zero until the speed of the high-speed main shaft becomes zero. The variable-pressure braking method provides an ideal braking torque and rotating speed change for braking, and more precise and more stable braking is achieved. By continuously adjusting the braking pressure in the braking process, the braking torque as high as possible can be output to realize rapid braking, and the braking pressure with the speed change rate as low as possible can be output so that the rigid impact on a whole transmission chain in the braking process can be reduced.
Description
technical field [0001] The invention relates to the technical field of braking, in particular to a variable-pressure mechanical braking method for high-speed and heavy-load working conditions with adjustable braking pressure according to different working conditions and a mechanical braking system for large megawatt wind turbines. Background technique [0002] The disc brake method of existing high-speed heavy-duty machines is generally that when the machine is braked, the brake uses air pressure, hydraulic pressure, spring force and other loading methods to provide a constant brake pressure P, and this pressure is applied to the brake. The moving plate makes it contact with the rotating brake disc to generate friction force f. If the friction torque is greater than the torque generated by the rotation of the machine load, the speed can be gradually reduced until the rotating parts stop completely. When the brake is working, it will be subjected to the reaction force f' of f...
Claims
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IPC IPC(8): F03D7/02F03D7/04
CPCF03D7/0248F03D7/04F05B2270/604Y02E10/72
Inventor 刘宇崔昊尹剑马付建张生芳沙智华杨大鹏
Owner DALIAN JIAOTONG UNIVERSITY