Abstract:
A torque motor (8) comprises an armature (30) placed radially between a central bar (31) and an external ferromagnetic tubular portion (32). The central bar (31) comprises two portions of the same cylinder (33A, 33B) diametrically opposite each other and having substantially equal angular amplitudes below 180°, and separated by generally parallel longitudinal flats (34A, 34B). A radial permanent bar magnet (35) is incorporated in the central bar (31) between the cylinder portions (33A, 33B). The armature (30) has a winding (36) formed from longitudinal strands (36A) connected by transverse strands (36B) and arranged into bundles (F1, F2) within which all currents flow in the same direction at all times.
Abstract:
Un actionneur magnétique, tel qu'un palier magnétique, comprend une partie fixe (2) et une partie mobile (1). Ces parties sont ferromagnétiques et forment entre elles un entrefer (E) s'étendant parallèlement à une première direction prédéterminée. L'actionneur magnétique comprend en outre une paroi amagnétique (3) interposée dans l'entrefer; La paroi est par exemple celle d'une enceinte de confinement. L'actionneur magnétique est caractérisé en ce que l'une (2) des parties fixe et mobile comprend des doigts (25) pénétrant dans la paroi amagnétique, dirigés vers l'autre (1) des parties fixe et mobile.
Abstract:
A rotor (B) is centred with respect to a stator (A) by means of a magnetic bearing (10) active on an axis parallel to the reference axis (Z-Z), and two magnetic centring devices (20,30). An electromagnetic motor (40) controlling the movement of the rotor is arranged radially outside the bearing and axially between the centring devices. The stator has pairs of pole pieces (11',11";12',12") on either side of the axis, with magnets (13,14) magnetised radially in opposite directions between them. The rotor has two U-section pole pairs (15',15";16',16") on opposite sides of these with air gaps. Coils (17,18) are supplied from a radial centring servo circuit (19) connected to a position, velocity or acceleration sensor (19S).
Abstract:
Magnetic bearing for the active magnetic centring, in at least one axis, of a mobile body according to another body perpendicular to a reference axis (Z-Z) of a body (B,B',B'',BB) which can move with respect to another body (A, A',AA), comprising, on each side of a plane of symmetry perpendicular to the centring axis, and containing the reference axis, at least one permanent magnet (3,3';3-3') magnetised parallel to the reference axis; at least one coil (9,9') wound around a ferromagnetic core (4,4') directed parallel to the reference axis; the magnet (3,3') and the core (4,4') about which the coil (9,9') is wound are gripped between two ferromagnetic plates (1,2; 1',2'; 1-1',2-2') carried by the said other body, whilst the mobile body carries a polar ferromagnetic piece (6,6') adapted so as to turn back on themselves, via the said air gaps (7,8; 7',8'), the magnetic fluxes circulating in the ferromagnetic plates. … …
Abstract:
The bearing is used to centre, w.r.t an axis (X-X), a moving object (B, B') w.r.t an other object (A, A'). The bearing includes a permanent magnet (3,3') which is disposed parallel to a reference axis (Z-Z). A coil (9,9') is wound around a ferromagnetic core (4,4') carried by the second object. A ferromagnetic armature is formed by a part (6) mounted on the moving object and another part mounted on the other object. The two parts are adapted to enclosed the magnetic flux generated by the magnet and the coil across the gaps separating the two parts. The second part includes two parallel plates (1,2) which are perpendicular to the reference axis, and on which the core is fixed. The system is stabilised by a control circuit (12) linked to a position, speed or acceleration sensor of the moving ferromagnetic part.