TRIAXIAL ACTIVE CONTROL TYPE MAGNETIC BEARING AND ROTARY MACHINE USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a triaxial active control type magnetic bearing device having good assembling property for allowing the insertion of a rotor into a stator after load connection or balance adjustment while suppressing the axial length of the rotor. SOLUTION: The unbalance of magnetic flux density is produced by the superimposition of radial magnetic fluxes Ψy, Ψxwhich are generated on the axes of the radial control stator 2 in the same direction by a radial winding 1, onto a bias magnetic flux Ψbwhich is radially generated by a permanent magnet 3, to generate radial-direction biaxial shaft supporting forces Fy, Fx, while the unbalance of magnetic flux density is produced by the superimposition of a thrust magnetic flux Ψzwhich is generated by a thrust winding 5 to change its direction from one annular portion 4b of the thrust control stator 4 to the cylindrical rotor 7 and the other annular portion 4b, onto a bias magnetic flux Ψbwhich is generated by a permanent magnet 3 to tend from the annular portions 4b, 4b toward the center of the annular rotor 7, to generate a thrusting-direction uniaxial shaft supporting force Fz. COPYRIGHT: (C)2011,JPO&INPIT