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Pitch variation control device for the blades of a turbomachine rotor and method of operating the device

  • US 5,595,474 A
  • Filed: 04/04/1996
  • Issued: 01/21/1997
  • Est. Priority Date: 11/10/1993
  • Status: Expired due to Fees
First Claim
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1. A pitch variation control device for blades of a turbomachine having a rotor wherein said blades are mounted on a disc rotated by a shaft of the turbomachine and each of said blades has a longitudinal axis and a root by which said blade is pivotable about its longitudinal axis, said control device comprising:

  • actuating means for changing the pitch of said blades and locking means for locking said roots of said blades, said actuating means including an electric motor having a stationary stator winding and a rotor which is secured to said turbomachine shaft and has no electrical connection to the stator,a toothed wheel which is rigidly secured to said rotor of said electric motor, and pinion sectors rigidly secured to said roots of said blades and meshing with said toothed wheel, said locking means including an electromechanical actuator which is rigidly secured to said turbomachine shaft, and a rotary transformer electrically powering said actuator.

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