Wind power facility having activation circuit for a speed-limited and voltage-source-protective operation of a pitch-drive series-wound motor at generator torques

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.