BEARING CONDITION MONITORING APPARATUS AND CONTROL TECHNIQUE
Publication Date: 2014-Mar-28
The IP.com Prior Art Database
The present invention proposes a technique to monitor and control pitch or yaw bearing condition in a wind turbine. The invention includes the technique with two concepts to measure deflection of the bearing outer and inner ring. One concept includes design of a sealing device to monitor pitch or yaw bearing condition.
The present invention relates generally to a wind turbine and more particularly to a technique for monitoring and control bearing condition of the wind turbine.
Multiple issues of wind turbines bearing failure have been reported. Root cause analysis (RCA) for all such failures indicates that the damage and truncation of cage or raceway are likely to be at location with highest load.
A conventional technique includes a technique to load a device on bearing rings to detect deformation of the bearing and measure a blade load.
Another conventional technique includes a technique and apparatus for wind turbine rotor load control based on shaft radial displacement.
One other conventional technique includes drill holes on bearing ring to locate sensors and axial displacements of the bearing ring to reflect wear of the rolling bearing.
Yet another conventional technique includes displacement sensor fixed on outer ring, which are arranged at a position, shifted by 90 degrees to detect radial displacement.
However, the conventional techniques are designed only for bearing redesign, cage material selection and load analysis, among others. The conventional techniques do not provide pre-warning and protection of the bearing.
It would be desirable to have an efficient technique to provide warning and protection for bearing failure in the wind turbine.
BRIEF DESCRIPTION OF THE DRAWING
Figure 1 depicts signal harness build in pressure or load sensor in the bearing sealing.
Figure 2 depicts proximity sensor to detect relative distance L1 between the inner and outer rings.
Figure 3 depicts control logic for the workflow.
The present invention proposes a technique to monitor and control pitch or yaw bearing condition in a wind turbine. The invention includes the technique with two concepts to measure deflection of the bearing outer and inner ring. One concept includes a design of a sealing device to monitor the pitch or yaw bearing condition. A sensor is applied on the pitch or yaw bearing sealing to detect deflection between an inner and outer ring of the pitch or yaw bearing. The sealing device gives out a warning signal when deflection of the bearing inner and outer ring exceeds setting limitation of the sealing. The design of the sealing device avoids bearing failure due to high load or stress. High load or stress is mainly due to displacement between inner and outer rings.
Another concept detects relative displacement between bearing inner and outer ring directly. Advanced Loads Control (ALC) sensor is located on the outer ring to detect gap distance between the outer and inner ring. Therefore, monitoring distance change between the outer and inner ring indicates load change inside the bearing.
The first concept allows build in pressure or load sensor in a bearing-sealing root. This is mainly due to displacement between bearing inner and outer ring which results...