A drive device comprises at least one tubular linear motor (M1; M1; M2) which has a cylindrical armature (20; 120) and a tubular stator (10) with a cylindrical magnetic yoke (11) and a through-hole (13) coaxial with the magnetic yoke (11). Electric drive coils (12; 112) are arranged in the magnetic yoke (11). The armature (20; 120) has a non-magnetic armature tube (21) in which permanent magnets (23) are arranged. The armature (20; 120) extends coaxially through the through-hole (13) and is mounted so as to be movable in its longitudinal direction relative to the stator (10). The drive device comprises linear ball bearings (15; 115), and the armature (20; 120) of the tubular linear motor (M1; M1; M2) is mounted in the linear ball bearings (15; 115).

A rolling bearing is provided which includes an inner ring; an outer ring; rolling elements disposed in the bearing space; a cage rollably retaining the rolling elements; and a seal member made of a resin. The seal member includes a support frame, a plurality of window holes, and a filter closing the window holes. Lubricating oil flows through the bearing space to lubricate the interior of the rolling bearing. The cage is made of a magnetic material, and has a pulse ring integrally formed at an end of the cage. The rolling bearing further includes a magnetic rotation sensor mounted to the seal member so as to be capable of being opposed to any of recesses and protrusions of the pulse ring.

A magnetic bearing assembly (20) comprises a first magnet assembly (34) for generating a first quadrupole magnetic field in a first plane and a second magnet assembly (36) for generating a second quadrupole magnetic field in a second plane. The second plane is arranged parallel to the first plane. The quadrupole magnetic fields exhibit in each case in the planes magnetic field axes arranged at an angle to one another between four poles. A longitudinal axis (A) is defined at right angles hereto by the centres of the quadrupole magnetic fields. At least one diamagnetic element (44) is arranged on the longitudinal axis (A). The first and second magnet assemblies (34, 36) are arranged relative to one another in such a way that the first and the second quadrupole magnetic fields are rotated towards one another about the longitudinal axis (A) by an angular amount which is not a whole-number multiple of 90. Such a bearing arrangement can be used in particular in a magnetic levitation assembly (10) with a lifting assembly (26).

A magnetic bearing assembly (20) comprises a first magnet assembly (34) for generating a first quadrupole magnetic field in a first plane and a second magnet assembly (36) for generating a second quadrupole magnetic field in a second plane. The second plane is arranged parallel to the first plane. The quadrupole magnetic fields exhibit in each case in the planes magnetic field axes arranged at an angle to one another between four poles. A longitudinal axis (A) is defined at right angles hereto by the centres of the quadrupole magnetic fields. At least one diamagnetic element (44) is arranged on the longitudinal axis (A). The first and second magnet assemblies (34, 36) are arranged relative to one another in such a way that the first and the second quadrupole magnetic fields are rotated towards one another about the longitudinal axis (A) by an angular amount which is not a whole-number multiple of 90. Such a bearing arrangement can be used in particular in a magnetic levitation assembly (10) with a lifting assembly (26).

A rolling bearing is provided which includes an inner ring; an outer ring; rolling elements disposed in the bearing space; a cage rollably retaining the rolling elements; and a seal member made of a resin. The seal member includes a support frame, a plurality of window holes, and a filter closing the window holes. Lubricating oil flows through the bearing space to lubricate the interior of the rolling bearing. The cage is made of a magnetic material, and has a pulse ring integrally formed at an end of the cage. The rolling bearing further includes a magnetic rotation sensor mounted to the seal member so as to be capable of being opposed to any of recesses and protrusions of the pulse ring.

Provided are a tape guide roller and tape drive having a guide roller having magnets and bushings to stabilize a roller barrel for a tape medium. The tape guide roller has a roller barrel extending around a vertical axis. The tape medium passes across the roller barrel to guide the tape medium on a tape path. A plurality of magnets positioned with respect to the vertical axis provide an axial force to stabilize the tape guide roller axially.

In one embodiment, a ball joint comprises a base that includes a first surface that defines a hemispherical chamber and an electromagnet located internal to the base. The ball joint further comprises an armature plate fastened to the first surface of the housing and defining an aperture that extends through the armature plate towards the hemispherical chamber. The ball joint further comprises a shaft that extends through the aperture of the armature plate and has a rounded end that engages the hemispherical chamber of the housing. Powering the electromagnet draws the armature plate towards the first surface to provide compressive force to the shaft and prevents movement of the shaft.

Provided are a tape guide roller and tape drive having a guide roller having magnets and bushings to stabilize a roller barrel for a tape medium. The tape guide roller has a roller barrel extending around a vertical axis. The tape medium passes across the roller barrel to guide the tape medium on a tape path. A plurality of magnets positioned with respect to the vertical axis provide an axial force to stabilize the tape guide roller axially.

A magnetic bearing assembly (20) comprises a first magnet assembly (34) for generating a first quadrupole magnetic field in a first plane and a second magnet assembly (36) for generating a second quadrupole magnetic field in a second plane. The second plane is arranged parallel to the first plane. The quadrupole magnetic fields exhibit in each case in the planes magnetic field axes arranged at an angle to one another between four poles. A longitudinal axis (A) is defined at right angles hereto by the centres of the quadrupole magnetic fields. At least one diamagnetic element (44) is arranged on the longitudinal axis (A). The first and second magnet assemblies (34, 36) are arranged relative to one another in such a way that the first and the second quadrupole magnetic fields are rotated towards one another about the longitudinal axis (A) by an angular amount which is not a whole-number multiple of 90. Such a bearing arrangement can be used in particular in a magnetic levitation assembly (10) with a lifting assembly (26).

Disclosed is a ball bearing including an inner ring and an outer ring spaced apart from each other, each being rotatable, a cage part including a first cage and a second cage rotatably installed between the inner ring and the outer ring, and having ball receiving part formed along circumferential direction, ball installed in the ball receiving part, and rotating with the cage part as at least one of the inner ring and the outer ring rotates, and magnet which provides a magnetic force to the ball, wherein the first cage has a first seating part which is formed between the ball receiving parts, and on which one side of the magnet is placed, and the second cage has a second seating part which is connected to the first seating part, and on which the other side of the magnet is placed.