| 摘要 |
Arrangement to detect a rotational-speed of a blade higher than a predetermined speed.
According to the invention an arrangement is used to determine whether the rotational-speed of a blade (BL), which rotates around an axis, is higher than a predetermined speed. A transmit-unit (TU2) is located at the rotating blade (BL), while a receive-unit (TU1) is located at the rotating hub (HB) of the blade (BL). The transmit-unit (TU2) and the receive-unit (TU1) are connected by a transmission-system, which is used to transmit a signal (OS2) from the transmit-unit (TU2) to the receive-unit (TU1). A detection-unit (IR) is located at the blade, which is used to detect a centrifugal or centripetal force acting on the blade because of its rotation. The detection-unit (IR) is built to interrupt the transmission of the signal (OS2), if the detected force exceeds a predetermined value. The receive-unit (TU1) comprises a control-unit (CU), which detects a rotational-speed (ROS) of the blade higher than a predetermined speed (BL) by detecting that the transmission of the signal has been interrupted (OS2).
The transmission-system is built as an optical-transmission system, which transmits an optical-signal (OS2) from the transmit-unit (TU2) to the receive-unit (TU1) for the detection. |
