Pitch drive device for a wind power or hydroelectric power station

摘要

A pitch drive device for a wind power or hydroelectric power station having a synchronous motor and a motor operation switchover unit for switching between a normal operation and emergency operation modes. To do so, the synchronous motor is operable in normal operation with three-phase AC and in emergency operation with DC. A method for operating a pitch drive device of this type is also disclosed.

主权项

1. Pitch drive device for a wind power or hydroelectric power station comprising:
a synchronous motor and a motor operation switchover unit for switching between normal operation and emergency operation, such that the synchronous motor is operable in normal operation using an AC supply and in emergency operation using a DC supply; the synchronous motor comprising a stator, a shaft and a rotating field generating device for generating a rotating field from the DC supply for a rotating stator magnetic field of the stator of the synchronous motor; the rotating field generating device being in electrical contact with the stator and the rotating field generating device is being a mechanical rotating field generating device that can be connected to the shaft of the synchronous motor; wherein the rotating field generating device comprising a DC transmission unit and a rotating field transmission unit; the DC transmission unit comprising two annular or circular DC slip-rings rotatable with the motor shaft and two fixed DC brush units; and the rotating field transmission unit comprising a multi-polar annular or circular rotatable commutation unit having commutator segments and a plurality of angularly offset and fixed rotating field brush units, where in emergency operation the direct current is transformed by the DC transmission unit and by the rotating field transmission unit to a rotating alternating current for supplying the stator.