Your Search Results

Use this resource - and many more! - in your textbook!

AcademicPub holds over eight million pieces of educational content for you to mix-and-match your way.

Experience the freedom of customizing your course pack with AcademicPub!
Not an educator but still interested in using this content? No problem! Visit our provider's page to contact the publisher and get permission directly.

High Rotational-Rate Rotor With High-Temperature Superconducting Bearings

By: Strasik, M.; Hull, J.R.; McIver, C.R.; McCrary, K.E.; Johnson, P.E.; Gonder, J.F.; Mittleider, J.A.;

2009 / IEEE


This item was taken from the IEEE Periodical ' High Rotational-Rate Rotor With High-Temperature Superconducting Bearings ' We present results of an experiment with a 15.4-mm-dia, 150-mm-long rotor that uses HTS bearings for levitation and rotates in vacuum at kHz rates. Bearing losses are presented as a function of rotor speed up to a frequency of f = 1681 Hz. For f > 80 Hz (bearing resonances are at 28 and 41 Hz), the rotational drag increases monotonically with frequency up to a maximum at ~274 Hz, then decreases monotonically with frequency. For f >160 Hz, the rotational deceleration may be well represented by the term B + A(f/f0)/[1+(f/f0)2], where B and A are constants and f0 is the frequency at the drag peak. The frequency dependent term may be interpreted as the circumferential inhomogeneity of the PM interacting with the flux-flow resistivity of the HTS. At higher speeds, the frequency-dependent term is governed by the skin depth and becomes proportional to 1/f1/2.