Centering and safety device for rotors supported without contact
Patent 4629261 Issued on December 16, 1986. Estimated Expiration Date: 
February 4, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
February 4, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2785023 3556425 3759588 3779136 Bearing structure Damping restraining bearing for supercritically operation rotors Electronically controlled positioner for pneumatic actuators Safety device for motor pump group Electrohydraulic, two-stage, proportional displacement valve Patent #: 4545409 Inventors
AssigneeApplicationNo. 06/698235 filed on 02/04/1985US Classes:310/90.5, Magnetic bearing251/30.01, Electrically actuated pilot valve310/90, Bearing or air-gap adjustment or bearing lubrication384/102, Backup384/448, Sensor or inspection features; liquid metal or shipping protection features; bearing member integral with seal91/361Electrical input and feedback signal means (459)ExaminersPrimary: Skudy, R.Attorney, Agent or FirmInternational ClassesF16C 35/073 (20060101)F16C 39/00 (20060101) F16C 39/06 (20060101) F16C 35/04 (20060101) F16C 19/52 (20060101) F16C 19/00 (20060101) Foreign Application Priority Data1981-10-22 DEAbstractA safety and centering device for rotors suspended in contactless magnetic bearings, which provides almost instantaneous centering support for the rotor if the bearing magnets loose power. In a preferred embodiment, the rotor shaft has a collar with a conical friction surface, and a sleeve controlled by an electro magnet with counter-acting springs and also having a conical friction surface. In case of power failure the springs force the two surfaces together and provide centering support for the rotor. In another embodiment having a vertical rotor, the bearing magnets lift the rotor with the friction collar out of engagement with the matching stationary friction surface when the rotor is operating; but if the rotor bearings become de-energized the rotor drops with the collar falling into engagement with the matching friction surface. | |
