BLADE PITCH CONTROL
First Claim
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1. A method of controlling blade pitch angle using a primary and a secondary electrical control system, the method comprising the steps of:
- a. Comparing a demanded and a measured blade pitch angle and calculating any difference therebetween,b. in the primary electrical control system, where there is a difference, applying a torque to a blade pitch regulator to reduce the magnitude of the difference to zero, andc. in the secondary electrical control system, where the difference is greater than a pre-determined threshold, applying a torque to a blade pitch regulator to reduce the magnitude of the difference to the pre-determined threshold.
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Abstract
A method of controlling blade pitch angle, comprising the steps of:
- comparing demanded and measured blade pitch angle and calculating any difference therebetween,
- in a primary electrical control system, where there is a difference, applying torque to a blade pitch regulator to reduce the magnitude of the difference to zero, and
- in a secondary electrical control system, where the difference is greater than a pre-determined threshold, applying torque to a blade pitch regulator to reduce the magnitude of the difference to the threshold.
Also an electrical system of blade pitch angle control for a set of blades comprising: primary and secondary electrical control systems, means for comparing demanded and measured blade pitch angle and calculating any difference therebetween, a look-up function having the difference as its input and outputting a required torque, and a torque regulator to apply the required torque to the set of blades.
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Citations
14 Claims
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1. A method of controlling blade pitch angle using a primary and a secondary electrical control system, the method comprising the steps of:
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a. Comparing a demanded and a measured blade pitch angle and calculating any difference therebetween, b. in the primary electrical control system, where there is a difference, applying a torque to a blade pitch regulator to reduce the magnitude of the difference to zero, and c. in the secondary electrical control system, where the difference is greater than a pre-determined threshold, applying a torque to a blade pitch regulator to reduce the magnitude of the difference to the pre-determined threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An electrical system of blade pitch angle control for a set of blades, the system comprising:
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a. a primary electrical control system including a primary look-up function means, b. a secondary electrical control system including a secondary look-up function means, c. means for comparing a demanded and a measured blade pitch angle and calculating any difference therebetween, the means coupled to the primary and secondary electrical control systems, d. the primary look-up function means having the difference as its input and outputting a required torque, e. the secondary look-up function means having the difference as its input and outputting a required torque, the output being zero below an input threshold, and f. a torque regulator coupled to the primary and secondary electrical control systems to apply the required torque to the set of blades. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification