| 摘要 |
<p>A lightweight system for adjusting the pitch of a plurality of variable pitch wind turbine blades comprises, a rotatable hub 15 on which the blades 10, 12 are mounted, an individual hydraulic actuator 28 mounted on the hub and connected to each blade for setting the blade at a preselected pitch and an electrical feedback device 70 providing a controller with a signal indicative of the actual pitch setting of the blades. The actuators are provided with hydraulic fluid by means of a transfer bearing while the feedback device is electrically connected to the controller through slip rings rotatable with the hub (Fig. 3 not shown). <IMAGE></p> |
