Cryogenic magnetic bearing. Final report, 1 November 1985-1 May 1991

Technical Report · Tue Dec 01 00:00:00 EST 1992

OSTI ID:6327984

Andrus, J; Kendig, J; Kroeger, J

Magnetic suspension provides an alternative to rolling-element bearings for some precision gimbal applications. The Cryogenic Magnetic Bearing program includes studies of magnetic suspension for a gimbal bearing requiring long life (greater than 7 years); low runout (less than 5 microrads bore-sight error due to runout); and low, uniform drag torque. Additionally, the bearing is to operate is an oscillating mode, from room-ambient (300 deg K) to liquid nitrogen (77 deg K) temperatures at ambient pressure and in a hard vacuum (10 (exp-6) torr). Two magnetic suspension alternatives were studied: an all-active approach using electromagnets to control all five bearing degrees-of-freedom and a Passive-Radial Active-Axial (PRAA) approach using passive magnetics to stabilize four of the five bearing degrees-of-freedom and an electromagnet to control the fifth. The all-active approach provides a lower weight, better-accuracy bearing system than the PRAA system, but requires more quiescent operating power and is electrically more complex. The PRAA was selected for hardware study to produce a simple, low-power magnetic system.

• Research Organization: Honeywell, Inc., Glendale, AZ (United States). Satellite Systems Operations
• OSTI ID: 6327984
• Report Number(s): AD-A-264716/2/XAB; S-71-1180-1.0-1; CNN: F33615-86-C-5015
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
42 ENGINEERING
MAGNETIC BEARINGS
CRYOGENICS
PERFORMANCE TESTING
DEGREES OF FREEDOM
ELECTROMAGNETS
HIGH VACUUM
LOW PRESSURE
PRESSURE DEPENDENCE
SERVICE LIFE
STABILIZATION
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0065-0273 K
TORQUE
BEARINGS
ELECTRICAL EQUIPMENT
EQUIPMENT
LIFETIME
MAGNETS
TEMPERATURE RANGE
TESTING
661210* - Cryogenics- (1992-)
420200 - Engineering- Facilities
Equipment
& Techniques