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A windpower system includes a support and a turbine having a shaft rotatively mounted to the support. The turbine has variable pitch blades whose pitch is controlled by the differential motion of a rotary control shaft coaxial with the turbine shaft and the turbine shaft itself so that the blade pit

A windpower system includes a support and a turbine having a shaft rotatively mounted to the support. The turbine has variable pitch blades whose pitch is controlled by the differential motion of a rotary control shaft coaxial with the turbine shaft and the turbine shaft itself so that the blade pitch can be varied by a stationary motor without requiring any slip rings or other such wear-prone couplings. In the event of a power failure, rotary motion of the control shaft is prevented so that the turbine blades are feathered solely due to the force developed by the rotating turbine. Also, if the turbine is used to generate electrical power, an induction generator coupled to the turbine shaft is employed whose shaft speed is indicative of generator output power. Accordingly, generator speed is monitored and used to control the pitch of the turbine blades so as to maintain generator output power at the maximum value when wind speed is below the machine\s rated wind speed, and no more than rated output power when wind speed exceeds rated wind speed.

대표청구항 ▼

A windpower system comprising A. a support, B. a turbine shaft rotatively mounted to the support, C. a turbine having variable pitch blades rotatively mounted to a hub connected to one end of the turbine shaft, D. an induction generator coupled to the turbine shaft and for producing rated output pow

A windpower system comprising A. a support, B. a turbine shaft rotatively mounted to the support, C. a turbine having variable pitch blades rotatively mounted to a hub connected to one end of the turbine shaft, D. an induction generator coupled to the turbine shaft and for producing rated output power, the speed of said generator being indicative of the output power from the generator, E. means for monitoring the speed of the generator and producing a signal indicative of said speed, F. a control shaft rotatively mounted to the support, G. means for moving the pitch angle of the blades in response to the relative rotation of the control shaft and the turbine shaft, H. means for varying said relative rotation in response to changes in the torque developed by the turbine shaft, I. monitoring means for controlling rotation of the control shaft so that the generator produces maximum output power when wind speed is below the machine\s rated wind speed, and no more than rated output power when wind speed exceeds rated wind speed, J. a brake acting between the support and the control shaft so that by engaging the brake, the blades can be moved to their fully feathered position solely by the torque developed by the rotating turbine, K. means responsive to the total angular displacement from a reference position of the control shaft relative to the turbine shaft for indicating when the blades are in the featured position, a start-up position, the full-power position and a so-called scram position between the latter two positions, and L. control means operative in response to the indicating means for engaging the brake to move the blades to their fully feathered position when they have moved from their full-power position to said scram position if wind speed is so high that rated generator power is sustained even with the turbine feathered back to the scram angle.