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Magnetic bearing apparatus

  • US 5,530,306 A
  • Filed: 04/14/1994
  • Issued: 06/25/1996
  • Est. Priority Date: 04/14/1993
  • Status: Expired due to Term
First Claim
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1. A magnetic bearing apparatus comprising:

  • first and second radial magnetic bearings each including a plurality of electromagnets for exerting magnetic attraction forces produced by said electromagnets on a rotating member having an axis of rotation along a horizontal direction in two positions spaced apart from each other in an axial direction of said rotating member and respectively supporting said rotating member in a radial direction with clearances with said rotating member;

    first and second position detecting means for respectively detecting positions in the radial direction of said rotating member in the two positions in the axial direction of said rotating member; and

    a control device for adjusting said magnetic attraction forces respectively produced by said electromagnets in said first and second radial magnetic bearings based upon output signals of said first and second position detecting means to hold said rotating member in a predetermined position in the radial direction,said control device comprising;

    magnetic attraction force calculating means for calculating said magnetic attraction force produced by each of said radial magnetic bearings based upon said output signal of each of said position detecting means, a value of a control current supplied to said electromagnets in said radial magnetic bearings, and an attraction force coefficient of said electromagnets in said radial magnetic bearings, andcenter of gravity position calculating means for calculating a position of a center of gravity of said rotating member based upon comparison of said calculated magnetic attraction forces produced by both of said radial magnetic bearings, andmeans or adjusting said magnetic attraction forces based upon output signals of said first and second position detecting means and said calculated position of said center of gravity of said rotating member.

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