A control method for a pitch motor brake

Abstract

The invention discloses a variable-pitch motor brake control method. The method includes the steps that 1, the temperature value of the environment where a target variable-pitch motor brake is located is detected in real time; if the detected temperature value of the environment is lower than the preset temperature value, when the target variable-pitch motor brake is in the band-type brake state, whether the brake performance of the current target variable-pitch motor brake works normally or abnormally is judged; and if it is judged that the brake performance works abnormally, the step 2 is executed; and 2, a variable-pitch motor is controlled to conduct forward rotating and reverse rotating according to the designated speed in a circulating manner so as to control the target variable-pitch motor brake, and the target variable-pitch motor brake exits control when the brake performance returns to the normal state. The variable-pitch motor brake control method has the beneficial effects that the control achievement method is simple, the required cost is low, the brake can be suitable for the low-temperature environment, and the reliability of the brake performance is high.

Description

Technical field [0001] The invention relates to the technical field of pitch system control, in particular to a control method of a pitch motor brake. Background technique [0002] At present, megawatt-level wind turbines have formed large-scale market applications, and the pitch systems using pitch motors and integrated brakes account for most of the proportion. The brake integrated in the pitch motor is mainly used to provide braking torque for the blades to be fixed at the pitch angle with the least force when the wind turbine is stopped. If the braking performance of the brake fails, it cannot provide the fixed blade position. Sufficient braking torque will cause the mega wind turbine to fail to stop, and cause the wind turbine to withstand extremely harmful loads and collapse. [0003] In order to effectively reduce the wear caused by frequent braking, in the pitch system of the pitch motor with integrated brake, the gap between the inner wall of the bearing outer ring and th...

AI Technical Summary

Problems solved by technology

Because the pitch motor will generate heat when it is working, and the temperature will be very high under the necessary overload conditions, so the grease selected for the brake must meet the relatively high temperature conditions. After a certain temperature, it will almost solidify, and its viscosity is extremely high, thus affecting the normal movement of the needle roller in the bearing of the one-way brake to reach the braking position, reducing the braking performance of the one-way brake at low temperature, and may even cause the brake to fail completely in severe cases

Therefore, in the current pitch system, the pitch motor brake has poor adaptability in low temperature environment, and the braking performance reliability of the brake is low. It is easy to cause the megawatt wind turbine to bear the load when it stops, and affect the safety of the megawatt wind turbine. shutdown

[0004] At present, among the areas suitable for installing megawatt-scale wind turbines, quite a few of them will experience low or even extremely low temperatures in winter, and conventional lubricating greases can only be used in a certain temperature range. It completely covers a wide range of low temperature and high temperature. If a lubricating oil with a wide temperature range is developed for the brake alone, the research and development is difficult, and the cost of research and development and procurement is very high. Adaptability problem to improve brake reliability performance method

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