A control system and a method arranged for redundant supply of power to active magnetic bearings adapted for support of a shaft or rotor in a rotating machine. The control system comprises at least two control modules which are supplied external power. The control modules are connectable to a base module comprising a first set of power and sensor signal pathways which can be switched in to provide contact between a first control module and the active magnetic bearings, and a second set of power and sensor signal pathways which can be switched in to provide contact between a second control module and the active magnetic bearings. Each control module comprises a switching mechanism which is controllable for connecting the control modules one at a time to the active magnetic bearings via the first set or via the second set of power and sensor signal pathways.

The invention relates to a bearing assembly having a back-up bearing (2), which has an outer ring (4) arranged in a housing construction (12) in a flexible manner. The flexibility has angle-dependent extreme values, namely at least one minimum and at least one maximum. According to the invention, this bearing assembly is characterized in that, within 360° with respect to the circumference of the outer ring (4), there are more than two angles at which there is at least one local extreme value of the flexibility of the outer ring (4).

A rotor spinning machine has a multiple number of work stations arranged side by side in the longitudinal direction of the rotor spinning machine between two front-side ends of the rotor spinning machine, each of which work stations has a multiple number of work elements for the production and winding of a yarn. The work elements comprise at least one feed device, one severing device, one spinning rotor along with one winding device. Furthermore, the rotor spinning machine has a suction device for producing a negative spinning pressure at the work stations. The suction device includes at least two separate negative pressure sources, whereas one negative pressure source is arranged on each of the two front-side ends of the rotor spinning machine, and whereas each of the negative pressure sources is connected to a separate negative pressure channel that extends in the longitudinal direction of the rotor spinning machine only over a part of the work stations, It is provided that the suction device includes at least two separate negative pressure sources, whereas at least one negative pressure source is arranged on each of the two front-side ends of the rotor spinning machine, and whereas each of the two negative pressure sources is connected to a separate negative pressure channel that extends in the longitudinal direction of the rotor spinning machine only over a part of the work stations. Thereby, each work station has an individual drive, in particular a single electric drive, for the spinning rotor.

A bearing arrangement includes a shaft, at least one contact bearing and at least one non-contact bearing and a controller. The controller is configured to control a magnitude of a restoring force applied to the shaft by the non-contact bearing in accordance with a sensed parameter such that a stiffness of the shaft is modified such that one or more resonance frequencies of the shaft are moved away from one or more external forcing frequencies.

A power consumption control device includes: a voltage detection circuit configured to detect whether an input power supply of a magnetic levitation system to be controlled is turned off; and a comparison unit configured to detect an operating parameter of a motor of the magnetic levitation system during an operation of the motor as a generator, and compare the operating parameter with a set parameter to obtain a comparison result; a motor controller of the magnetic levitation system controls the motor of the magnetic levitation system to operate as the generator in a case that the input power supply is turned off, a bearing controller of the magnetic levitation system adjusts a magnitude of a bearing bias current of the magnetic levitation system according to the comparison result, to control a power consumption of a magnetic levitation bearing of the magnetic levitation system within a set range.

An electronic magnetic bearing fault-tolerant drive module includes a first plurality of switching elements and a second plurality of switching elements. At least one winding is interposed between the first plurality of switching elements and the second plurality of switching elements. The first and second switching elements are configured to selectively operate in a first mode and a second mode to generate an electromagnetic field. The electronic magnetic bearing fault-tolerant drive module is configured to detect one or more electrical faults including an open-circuit fault of at least one of the first and second switching elements.

A bearing arrangement (100) for a spinning rotor shaft (200) of an open-end spinning device, a spinning rotor shaft (200) for such a bearing arrangement (100) and a spinning rotor drive device comprising such a bearing arrangement (100) and such a spinning rotor shaft (200). The bearing arrangement (100) comprises at least one active magnetic radial bearing (110) for the spinning rotor shaft (200) which can be influenced by means of an electronic control system (300). The bearing arrangement is characterized in that the bearing arrangement (100) comprises an active magnetic axial bearing (130) for the spinning rotor shaft (200) which can be influenced by means of the or another electronic control system (300).

A system for storing electrical energy generated by an external energy source that includes a ring for storing kinetic energy of rotation, an assembly a control system, and at least two motors/generators. The assembly includes a plurality of independent supports, each releasably attachable to a levitation electromagnet such that pole faces of the levitation electromagnet oppose a top protruding surface of a levitation rail of the ring and each releasably attachable to a centering electromagnet such that pole faces of the centering electromagnet oppose a surface of the centering rail of the ring. The control system supplies current to each levitation electromagnet to generate vertical forces to levitate and vertically stabilize the ring and to each centering electromagnet to generate radial forces to center and horizontally stabilize the ring. At least two of motor/generators electromagnetically engage a reaction rail of the ring and impose a reversible torque on the ring to enable bi-directional transfer of electrical energy from the energy source to the ring in the form of kinetic energy of rotation of the ring, and subsequent recovery of electrical energy from the kinetic energy of rotation of the ring.

An assembly includes a rotating shaft supported with respect to a stationary housing by at least one active magnetic bearing presenting a mean radial air gap and at least one auxiliary bearing having first and second coaxially arranged annular surfaces is provided. One of the first and second coaxially arranged annular surfaces defines a clearance (E2) with one of the stationary housing and the rotating shaft, the clearance (E2) being less than the mean radial air gap and the other of the first and second coaxially arranged annular surfaces being integral with the other one of the stationary housing and the rotating shaft. The auxiliary bearing provides a first ball bearing and a second ball bearing having a misalignment with respect to each other in order to increase the starting torque.

One embodiment describes a rotary machine system, which includes a stator with a first tooth, a second tooth, a third tooth, and a fourth tooth; a first electromagnet that includes a first electromagnet wire wrapped around the second tooth and the third tooth and that generates a first magnetic field to attract a drive shaft; a first integrated position sensor, which includes a first sensor wire that carries a first current wrapped around the first tooth and the second tooth; a second integrated sensor, which includes a second sensor wire that carries a second current wrapped around the third tooth and the fourth tooth; and a controller that determines current position of the drive shaft based at least on change of inductance of the first sensor wire and the second sensor wire, and that instructs the first electromagnet to adjust magnitude of the first magnetic field based at least in part on the current position.