US 9,812,922 B2
Active magnetic bearing comprising means for damping the radial motion of a shaft of a rotary machine
Alfred Permuy, Rueil-Malmaison (FR)
Assigned to GE ENERGY POWER CONVERSION TECHNOLOGY LTD, (GB)
Filed by GE Energy Power Conversion Technology Ltd., Rugby Warwickshire (GB)
Filed on Oct. 30, 2013, as Appl. No. 14/66,960.
Claims priority of application No. 12 60419 (FR), filed on Oct. 31, 2012.
Prior Publication US 2014/0117801 A1, May 1, 2014
Int. Cl. H02K 7/09 (2006.01); F16F 15/03 (2006.01); F16C 32/04 (2006.01)
CPC H02K 7/09 (2013.01) [F16C 32/048 (2013.01); F16C 32/0457 (2013.01); F16F 15/03 (2013.01)] 13 Claims
OG exemplary drawing
 
1. An active magnetic bearing comprising:
a plurality of electromagnetic actuators, each of the electromagnetic actuators receiving an input current and being able to exert a radial force on a shaft of a rotary machine, with respect to the rotation axis of the shaft, the shaft configured to be held without contact between the electromagnetic actuators and to undergo radial motion when in rotation; and
supply means configured to supply the input current to each of the electromagnetic actuators, the supply means comprises a control means configured to control the input current of each of the electromagnetic actuators according to the position of the shaft with respect to the electromagnetic actuators, wherein the supply means comprises a damping means configured to dampen the radial motion of the shafts
each of the electromagnetic actuators comprising an excitation coil having an input terminal and an output terminal the damping means being configured to connect between the input terminal and the output terminal of each of the excitation coils;
the control means comprising a plurality of control members, each of the control members being connected between the input terminal and the output terminal of one of the excitation coils; and
the damping means comprising at least one passive filter of the band-pass type, wherein the at least one passive filter is connected between one of the control members and the excitation coil connected to the control member, and wherein the at least one passive filter is connected in parallel with the excitation coil and comprises a passive energy-dissipation component.