Patent ID: 8044528

Claim:
An apparatus comprising: a wind power facility comprising: an activation circuit for a speed-limited and voltage-source-protective operation, at one or more generator torques, of a pitch-drive series-wound motor comprising an armature winding and an exciter winding that are connectable separately from one another; a load resistor, which is switched essentially in series to the exciter winding and parallel to the armature winding, so that it ensures a minimum exciter current in motor operation, the load resistor being connected using a first terminal contact to a first terminal contact of the exciter winding and using a second terminal contact to a second terminal contact of the armature winding; and a voltage source, comprising a battery or accumulator; and wherein the first terminal contact of the armature winding is connected via a first power converter component to the first terminal contact of the exciter winding and to the first terminal contact of the load resistor, and wherein the first terminal contact of the armature winding is connected via a second power converter component to the second terminal contact of the exciter winding, and wherein the first power converter component is configured to transmit in motor operation and block in generator operation, and wherein the second power converter component is configured to transmit in generator operation and block in motor operation, and wherein the voltage source is switched between the second terminal contact of the exciter winding and a second terminal contact of the armature winding.