A state-of-the art servodrive for electric pitch systems was on display at WINDPOWER 2010 in the Moog booth. The PITCHmaster II was developed for the harsh conditions prevailing in rotor hubs. It operates reliably at constant internal switch gear cabinet temperatures ranging from -22°F to 158°F.
The design features several advantages, such as a capability to withstand high mechanical loads in the rotating hub. An external connection is facilitated by means of an integrated diode for EPU and dc link circuit decoupling. No need for shielded cables for the EPU because its connection is included in the EMC concept. Accurate EPU voltage measurements reduce the number of additional components in the switchgear cabinet, thus reducing installation time and increasing reliability. An integrated acceleration sensor supplies information on rotor speed, rotor position, and vibrations. This data can be used for condition monitoring equipment. An inherently earth-fault proof brake driver allows regulating holding brakes to EPU voltage level, thus reducing the number of relevant switching devices in the switchgear cabinet. The motor software also supports control of synchronous, asynchronous, or dc motors.
Lastly, the PITCHmaster II was optimized to increase its reliable operation in harsh environments. This reduces the number of maintenance intervals which leads to higher wind turbine availability.
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