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APPARATUS FOR MONITORING THE ROTATIONAL SPEED IN A WIND ENERGY PLANT

  • US 20090193894A1
  • Filed: 03/18/2008
  • Published: 08/06/2009
  • Est. Priority Date: 02/05/2008
  • Status: Active Grant
First Claim
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1. An apparatus for monitoring the rotational speed in a wind energy plant, with a rotor shaft (14) which is driven by the rotor and runs out into a gear unit (16), and with a generator shaft (22), which connects an output shaft of the gear unit (16) with a generator/converter unit (24), characterised by a first rotational speed detection unit (26) on the rotor shaft (14) and a second rotational speed detection unit (8) on the generator shaft (22), wherein each rotational speed detection unit (26, 34) has at least two rotational speed sensors working independently from each other, an analysing unit (32) for the rotational speed, to which the measured signals (28, 30, 36, 38) of the rotational speed detection units (26, 34) are applied and which generates an error signal for a rotational overspeed when a certain maximum value for the rotational speed is exceeded.

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