| 摘要 |
PCT No. PCT/FR94/01303 Sec. 371 Date May 3, 1996 Sec. 102(e) Date May 3, 1996 PCT Filed Nov. 8, 1994 PCT Pub. No. WO95/13480 PCT Pub. Date May 18, 1995A device for mounting and driving a tubular spindle (10) has first and second axial-flux radial active magnetic bearings (60, 70) disposed respectively at a first end of the tube (10) and at a second end thereof. Each of the radial active magnetic bearings (60, 70), between which an electric motor (80) is interposed, includes a stator magnetic circuit made up of two subassemblies (61, 62; 71, 72) each of four axial-flux slot-free touching elements distributed around the tube (10). A mechanism is also provided for establishing a reduced pressure, of the order of a few hundreds of Pascals to a few thousands of Pascals, inside the spindle in the air gaps of the radial magnetic bearings (60, 70) and of the electric motor (80). |
