Abstract: A control system for a turbine blade, including: an operational control element for generating and outputting an operational control signal, the operational control signal for non-emergency operation of a motor for controlling pitch of the turbine blade; an emergency control element, separate from and different from the operational control element, for generating and outputting an emergency control signal for emergency operation of the motor; and, an output stage element for receiving the operational and emergency control signals and for selecting one of the operational or emergency control signals, and with a means for receiving power for operation of the motor and with a means for providing the received power to the motor according to the selected operational or emergency control signal.

Abstract: In a wind turbine/generator having a rotatable hub, at least one blade rotatably secured to the hub, a pitch control system for adjusting pitch of each blade, the pitch control system located within the rotatable hub, a stationary nacelle, and a slip ring assembly at a junction of an electrical circuit between the rotatable hub and the stationary nacelle, the slip ring assembly operatively arranged for transmission of electrical signals between equipment located within the rotating hub and equipment located within the stationary nacelle, an apparatus for grid loss ride-through for the pitch control system, comprising for example, operational amplifiers for sensing and monitoring power on the rotating side of the slip ring assembly, and, a contactor coil, for example, for supplying power to the pitch control system from a backup power source when the sensed power drops to a predetermined level.

Abstract: A control system for a turbine blade, including: an operational control element for generating and outputting an operational control signal, the operational control signal for non-emergency operation of a motor for controlling pitch of the turbine blade; an emergency control element, separate from and different from the operational control element, for generating and outputting an emergency control signal for emergency operation of the motor; and, an output stage element for receiving the operational and emergency control signals and for selecting one of the operational or emergency control signals, and with a means for receiving power for operation of the motor and with a means for providing the received power to the motor according to the selected operational or emergency control signal.