H - Electricity – 02 – K
Patent
H - Electricity
02
K
310/17
H02K 9/00 (2006.01) H02K 55/04 (2006.01)
Patent
CA 1079339
SUPERCONDUCTING DYNAMOELECTRIC MACHINE HAVING A LIQUID METAL SHIELD ABSTRACT OF THE DISCLOSURE A superconducting synchronous motor or generator which utilizes separate radiation and damper shields around a superconducting field winding on the machine rotor. The damper shield includes a pair of concentrically disposed cylinders held in radial spaced relationship with each other by pillar type structural members. A liquid metal fills the space between the concentric cylinders and as the rotor, including the cylinders, is accelerated to its operating speed, the liquid metal likewise will reach synchronous speed as a result of viscous drag between the liquid metal and the cylinder walls. During operation, the rotor shield- ing function is performed by the electrically conducting liquid metal moving at synchronous speed during steady state operation. Current generated in the liquid metal shields the superconducting field winding from alternating flux generated in the armature due to phase imbalance and har- monics. During fault conditions, such as a terminal short circuit, currents are generated in the liquid metal to shield the high armature demagnetizing flux from the super- conducting winding. These currents in the liquid metal react with the field flux in the air gap to produce body forces in the liquid metal which result in the motion of fluid particles. Forces moving in a radial direction would tend to establish a pressure gradient in the liquid metal, but since the liquid metal is free to move and the pressure gradient cannot be maintained, flow takes place in the space between cylinders to equalize the pressure in the annulus -1- which contains the liquid metal. The tangential body forces that applied an oscillating torque on prior art metallic dampers, will result in oscillating circumferential liquid metal flow. Since the liquid metal transmits forces only by- pressure and shear, large pressure gradients cannot be maintained in the annulus and the external forces on the containment cylinders tend to balance the internal pressure thus eliminating bending stresses encountered in the metal- lic shield. Also, since circumferential body forces can transmit shear only by viscous forces, the torque reaction is significantly reduced.
283251
LandOfFree
Superconducting dynamoelectric machine having a liquid... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Superconducting dynamoelectric machine having a liquid..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Superconducting dynamoelectric machine having a liquid... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-385242