Abstract: An apparatus and a method for determining the viscosity of a fluid includes an electrical rotary drive (2) with a stator (3), which has a stator winding (4), and with a rotational body (5) which can rotate in the fluid (1). The rotational body (5) is designed as a rotor (5) of the rotary drive (2) and is magnetically journalled in a contact-free manner with respect to the stator (3).

Abstract: A gas forwarding apparatus for respiration and narcosis devices including a radial compressor and a drive apparatus which produces a magnetic rotary field, with the radial compressor including a housing within which a compressor wheel and a rotor which is connected thereto are arranged, with the drive apparatus being arranged outside the housing and with the drive apparatus and the rotor being designed to be mutually matched and arranged in such a manner that the rotor can be driven by the drive apparatus.

Abstract: In the method for the determination of the pressure (p) in and/or of the through-flow (Q) of a liquid through a pump having at least one magnetic bearing for the axial journaling of the pump rotor (1), axial forces act on the rotor (1) of the pump during operation. The axial forces which act on the rotor are utilised for the determination of the pressure (p) and/or of the through-flow (Q).

Abstract: The method for the holding in flotation of a substance such as a tissue part in a bioreactor (61) is characterized in that the substance (73) is acted upon with a fluid; and in that the flow of the fluid acts counter to gravity in such a manner that the substance (73) is held in flotation. The bioreactor (61) with a container (62) for a substance (73) which is to be acted upon with fluid comprises a first flow chamber (66a) to which a flowing fluid can be supplied, with the first flow chamber (66a) being designed in such a manner that the fluid which flows upwardly therein has a lower speed with increasing height.

Abstract: An electromagnetic rotary drive, designed as bearingless motor, is proposed which comprises a magnetically journalled rotor (3) and a stator (2) which comprises a drive winding for producing a magnetic rotary drive field which produces a torque on the rotor (3), and a control winding for producing a magnetic rotary control field by means of which the position of the rotor (3) with respect to the stator (2) can be regulated, with the stator (2) having exactly six stator teeth (21).

Abstract: The magnetic stirring apparatus (1p ) comprises an agitator (1a), at least one permanent magnet (1d, 1e) and a float body (1f), which are connected to one another.

Abstract: The invention relates to an apparatus and a method for determining the viscosity (&eegr;) of a fluid (1). The apparatus includes an electrical rotary drive (2) with a stator (3), which has a stator winding (4), and with a rotational body (5) which can rotate in the fluid (1). The rotational body (5) is designed as a rotor (5) of the rotary drive (2) and is magnetically journalled in a contact-free manner with respect to the stator (3).

Abstract: In a process chamber (1), in which various processing steps in the manufacture of semiconductors can be carried out, there is arranged a rotationally drivable rotary head (3) which serves as a holder for a substantially disc-shaped object to be processed (W), e.g. for a wafer. Furthermore, at least one applicator (50, 51, 52, 53) is provided in the process chamber (1) for the provision of a medium which acts on the object to be processed (W). Means (4) are arranged radially around the rotary head (3) for the journalling and for the driving of the rotary head (3).

Abstract: A clamping apparatus for clamping off a hose in a fluid system for biological liquids, in particular blood, which has a movably arranged closing member having a closing piece for clamping off the hose, having permanent magnetic holding device which is arranged and designed in such a manner that it can hold the closing member against a force in two different stable equilibrium positions, namely an open position and a closed position, without it being necessary to supply energy to the permanent magnetic holding device for the holding in the respective equilibrium position, and having actuation means in order to move the closed member out of the open position into the closing position.

Abstract: An electromagnetic rotary drive, designed as bearingless motor, is proposed which comprises a magnetically journalled rotor (3) and a stator (2) which comprises a drive winding for producing a magnetic rotary drive field which produces a torque on the rotor (3), and a control winding for producing a magnetic rotary control field by means of which the position of the rotor (3) with respect to the stator (2) can be regulated, with the stator (2) having exactly six stator teeth (21).

Abstract: A radial, active magnetic bearing apparatus comprising at least three electromagnets which are distributedly arranged is excited by a three-phase rotary current controller.

Abstract: The method for the holding of a substance such as a tissue part in suspension in a bioreactor (61) is characterized in that the substance (73) is acted upon with a fluid; and in that the flow of the fluid acts counter to gravity in such a manner that the substance (73) is held in suspension. The bioreactor (61) with a container (62) for a substance (73) which is to be acted upon with fluid comprises a first flow chamber (66a) to which a flowing fluid can be supplied, with the first flow chamber (66a) being designed in such a manner that the fluid which flows upwardly therein has a lower speed with increasing height.

Abstract: A sensor arrangement in an electromagnetic rotary drive which is designed as a bearing-free motor with a magnetically journalled, permanent magnetic rotor (1) and a stator (2), the sensor arrangement serving for the determination of the direction of the rotor magnetization and/or of the axial position of the rotor (1), comprises at least two sensors (S1, S2, S3) for the determination of a magnetic flux. The two sensors (S1, S2, S3) are arranged in such a manner with respect to the rotor (1) that partial fluxes of that magnetic field which the stray field of the permanent magnetic rotor (1) produces can be determined with them. Furthermore, a method for the determination of the direction of the rotor magnetization is proposed.

Abstract: The gas forwarding apparatus (1) for respiration and narcosis devices comprises a radial compressor (3) and a drive apparatus (2) which produces a magnetic rotary field, with the radial compressor (3) comprising a housing (3a) within which a compressor wheel (3b) and a rotor (3c) which is connected thereto are arranged, with the drive apparatus (2) being arranged outside the housing (3a) and with the drive apparatus (2) and the rotor (3c) being designed to be mutually matched and arranged in such a manner that the rotor (3c) can be driven by the drive apparatus (2).

Abstract: A magnetic bearing apparatus for the journalling of a body (3), in particular of a rotor (3), comprises a stator (2) with a control winding (22) having at least three loops (22a, 22b, 22c) for the production of a magnetic control field by means of which the position of the body (3) relative to the stator (2) can be regulated, with each loop (22a, 22b, 22c) belonging to a different electrical phase, and a control device (4) which in a first operating mode supplies each loop (22a, 22b, 22c) with in each case a phase current (Ia, Ib, Ic) or in each case a phase voltage (Ua, Ub, Uc) as a control parameter. Means are provided in order to regulate the control parameter for each loop (22a, 22b, 22c) independently of the control parameter for the other loops (22a, 22b, 22c) as well as a monitoring unit (5) which can switch the bearing apparatus into a second operating mode in which a reduced number of phases, which is at least two, produces the magnetic control field.

Abstract: A clamping apparatus is proposed for clamping off a hose in a fluid system for biological liquids, in particular blood, which comprises a movably arranged closing member (3) having a closing piece (31, 31′) for clamping off the hose (10), comprising a permanent magnetic holding device (2) which is arranged and designed in such a manner that it can hold the closing member (3) against a force in two different stable equilibrium positions, namely an open position and a closing position, without it being necessary to supply energy to the permanent magnetic holding device (2) for the holding in the respective equilibrium position, and comprising actuation means (4; 4a, 4b; 33; 33) in order to move the closing member (3) out of the open position into the closing position.

Abstract: A permanent magnetically excited electrical rotary drive for a blood pump is proposed, comprising a permanent magnetic rotor and a stator, said stator comprising a drive winding having at least two loops for the production of a magnetic drive field which produces a torque on the rotor, with each loop belonging to a different electrical phase, furthermore comprising a setting device which supplies each loop in each case with a phase current or in each case with a phase voltage as a setting parameter, with the setting device comprising a separate power amplifier for each loop so that the setting parameter for each loop can be regulated independently of the setting parameter for the other loops.

Abstract: A centrifugal pump for delivering a fluid has a pump housing that comprises a first and a second inlet as well as a first and a second outlet for the fluid, a magnetically mounted impeller located inside pump housing, said impeller being rotatable around a rotation axis, and comprising a magnetically active rotor in the shape of a disk or ring, as well as two sets of vanes, with one set of vanes being provided on each of the two axial boundary surfaces of rotor. The two outlets are offset with respect to one another in the axial direction.

Abstract: A sensor arrangement in an electromagnetic rotary drive which is designed as a bearing-free motor with a magnetically journalled, permanent magnetic rotor (1) and a stator (2), said sensor arrangement serving for the determination of the direction of the rotor magnetisation and/or of the axial position of the rotor (1), comprises at least two sensors (S1, S2, S3) for the determination of a magnetic flux. The two sensors (S1, S2, S3) are arranged in such a manner with respect to the rotor (1) that partial fluxes of that magnetic field which the stray field of the permanent magnetic rotor (1) produces can be determined with them. Furthermore, a method for the determination of the direction of the rotor magnetisation is proposed.

Abstract: A magnetically journalled rotational arrangement comprises a bearing stator and a rotor, with the bearing stator being magnetically coupled to the rotor and producing a magnetic journalling of the rotor. The bearing stator is rotatably journalled. Furthermore, a rotary drive which is associated with the bearing stator is provided, with a rotation of the bearing stator producing a rotation of the rotor via the magnetic coupling of the stator to the rotor.