The present invention provides a magnetic-hydraulic double-suspension bearing experiment table. In the experiment table, four blind holes are uniformly processed on left and right side surfaces of the two radial stators for magnetic-hydraulic double-suspension bearing; four countersunk through holes are uniformly processed on left side surfaces of the left supporting part of the fixed bracket and the right supporting part of the fixed bracket, and the radial stators for magnetic-hydraulic double-suspension bearing are fixedly connected to the upper end of the left supporting part of the fixed bracket by countersunk screws. In addition, the two radial stators for magnetic-hydraulic double-suspension bearing are processed with stops to ensure that the two radial stators for magnetic-hydraulic double-suspension bearing are concentric with the left supporting part of the fixed bracket and the right supporting part of the fixed bracket.

A system for controlling shaft displacement within a support structure, the system having a rotatable shaft, at least one bearing supporting the shaft, the at least one bearing having an inner race rotatable along with the shaft and an outer race circumferentially surrounding the inner race, an electromagnet assembly positioned about the shaft along a longitudinal axis thereof, and a controller that detects a radial motion of the shaft and determines a corrective force to reduce the radial motion of, or a parameter related to, the shaft, the controller commanding the electromagnet assembly to generate the corrective force to act on the shaft, the electromagnet assembly having a plurality of phases spaced circumferentially about the shaft, the controller commanding different phases of the electromagnet assembly to generate the corrective force so that a vector of the corrective force rotates about the longitudinal axis of the shaft.

In an aerodynamic bearing, an outer peripheral surface of a shaft and an inner peripheral surface of a sleeve face each other in a radial direction. The sleeve includes a through hole penetrating the sleeve in the radial direction. A space on a radially inner side of the sleeve communicates with an external space of a motor through the through hole. A stationary portion includes a wall portion radially overlapping the through hole with a gap interposed therebetween on a radially outer side of the through hole.

In an electric motor, a magnetic bearing generates an electromagnetic force between multiple permanent magnets and a coil and rotatably supports an other side of a rotation shaft in an axis line direction. The rotation shaft is configured to be capable of being inclined with a rotation center line using a bearing side of the rotation shaft as a fulcrum. An electronic control device controls a current that flows to the coil such that an axis line of the rotation shaft approaches the rotation center line due to a supporting force which is the electromagnetic force between the multiple permanent magnets and the coil. Accordingly, the rotation shaft is rotatably supported to be freely rotatable by a magnetic bearing and the bearing.

An integrated journal bearing (IJB) includes a shaft extending in an axial direction, a housing through which the shaft extends in the axial direction, the housing surrounding the shaft in a radial direction, an active magnetic bearing (AMB) arranged within the housing and surrounding the shaft in the radial direction, and at least a first fluid film journal bearing (JB) arranged within the housing and surrounding the shaft in the radial direction. The first JB is axially adjacent to the AMB such that first JB and the AMB do not share a common radial clearance, while both are commonly flooded with oil. A controller in signal communication with the AMB can be variously configured to supply current thereto to operate the AMB by controlling a magnetic force generated thereby.

A gas dynamic pressure bearing includes a shaft centered on a central axis extending in an up-down direction, and a sleeve that faces at least a portion of the shaft in a radial direction. The portion in which the sleeve and the shaft face each other in the radial direction includes a first dynamic pressure portion at each of both ends in the axial direction, and a second dynamic pressure portion between the first dynamic pressure portions. In the first dynamic pressure portion, one of the sleeve and the shaft includes dynamic pressure grooves arranged in a circumferential direction. A sum of center angles of groove widths of the dynamic pressure grooves in a cross-section cut along a plane orthogonal to the central axis is about 144 or more and about 216 or less.

A propulsion system for a motor vehicle includes a casing having first and second housing portions cooperating with one another to define a cavity. The propulsion system further includes an electric motor disposed within the cavity. A support mechanism is attached to at least one of the first and second housing portions. The support mechanism includes a first side that faces the first housing portion and a second side that faces the second housing portion and is disposed within the cavity. Bearing seats are formed in the first housing portion, the second housing portion, and the second side of the support mechanism. Bearings are engaged with an associated one of the bearing seats and are configured to rotatably support the input member, the layshaft, and the output member in a fixed-free bearing arrangement. The first side of the support mechanism is free of the bearing seats and the bearings.

A controller performs, in a first mode, a first operation for controlling composite electromagnetic force of electromagnets such that a target member moves within a predetermined moving range, and a second operation for acquiring temperature drift correlation information indicative of a correlation between a reference value and an input-output characteristic of a position sensor, based on the reference value and the input-output characteristic of the position sensor in the first operation. The controller performs, in a second mode, a third operation for controlling the composite electromagnetic force of the electromagnets according to a signal level of a detection signal from the position sensor, and a fourth operation for compensating the input-output characteristic of the position sensor in the third operation, based on the temperature drift correlation information and the reference value in the third operation.

A rotating-side magnet has a tubular shape extending in an axial direction and has different magnetic poles in the axial direction. A fixed-side magnet has a tubular shape extending in the axial direction, opposes the rotating-side magnet with a gap in the radial direction, and has magnetic poles radially different from the magnetic poles of the rotating-side magnet. Fixed-side auxiliary members each of which is made of a ferromagnetic material are provided at both axial ends of the fixed-side magnet.

A gas dynamic bearing includes a shaft extending along a central axis extending vertically, and a sleeve with a hole opening at least at one end of the sleeve in an axial direction, at least a portion of the shaft housed inside the hole. The sleeve includes dynamic pressure grooves in an inner peripheral surface of the hole. The shaft includes a core portion, and a protective portion that is disposed on an outer peripheral surface of the core portion and that includes at least a portion facing the inner peripheral surface of the hole in a radial direction. The protective portion includes a first protective portion and a second protective portion. The first protective portion is at least above or below the second protective portion in the axial direction, and includes at least a portion with a thickness in the radial direction more than a thickness of the second protective portion in the radial direction.