In a substrate stage, when a Y coarse movement stage moves in the Y-axis direction, an X coarse movement stage, a weight cancellation device, and an X guide move integrally in the Y-axis direction with the Y coarse movement stage, and when the X coarse movement stage moves in the X-axis direction on the Y coarse movement stage, the weight cancellation device move on the X guide in the X-axis direction integrally with the X coarse movement stage. Because the X guide is provided extending in the X-axis direction while covering the movement range of the weight cancellation device in the X-axis direction, the weight cancellation device is constantly supported by the X guide, regardless of its position. Accordingly, a substrate can be guided along the XY plane with good accuracy.

Systems and methods relate to a vertical takeoff and landing (VTOL) platform that can include a stator and a rotor magnetically levitated by the stator. The rotor and stator can be annular, such that the rotor rotates about a rotational axis. The stator can include magnets that provide guidance, levitation, and drive forces to drive the rotor, as well as to control operation of rotor blades of the rotor that can be independently rotated to specific pitch angles to control at least one of lift, pitch, roll, or yaw of the VTOL platform. Various controllers can be used to enable independent and redundant control of components of the VTOL platform.

A flywheel system comprises a flywheel rotor comprising a rotor disc and a rotor shaft and has a longitudinal axis extending centrally through the rotor disc and the rotor shaft. The system further comprises a journal assembly configured to facilitate rotation of the flywheel rotor. The journal assembly comprises a sleeve having an aperture extending therethrough from a first end to a second, opposite end, a rod at least partially disposed within the aperture of the sleeve, and a nut coupled to a portion of the rod. The rod has a length greater than the sleeve such that a portion the rod extends axially beyond the first end of the sleeve. A method of forming the flywheel comprises coupling the rod to the rotor shaft and pulling the second end of the rod to tension the rod. The nut maintains the tension in the rod when coupled thereto.

In a substrate stage, when a Y coarse movement stage moves in the Y-axis direction, an X coarse movement stage, a weight cancellation device, and an X guide move integrally in the Y-axis direction with the Y coarse movement stage, and when the X coarse movement stage moves in the X-axis direction on the Y coarse movement stage, the weight cancellation device move on the X guide in the X-axis direction integrally with the X coarse movement stage. Because the X guide is provided extending in the X-axis direction while covering the movement range of the weight cancellation device in the X-axis direction, the weight cancellation device is constantly supported by the X guide, regardless of its position. Accordingly, a substrate can be guided along the XY plane with good accuracy.

In a substrate stage, when a Y coarse movement stage moves in the Y-axis direction, an X coarse movement stage, a weight cancellation device, and an X guide move integrally in the Y-axis direction with the Y coarse movement stage, and when the X coarse movement stage moves in the X-axis direction on the Y coarse movement stage, the weight cancellation device move on the X guide in the X-axis direction integrally with the X coarse movement stage. Because the X guide is provided extending in the X-axis direction while covering the movement range of the weight cancellation device in the X-axis direction, the weight cancellation device is constantly supported by the X guide, regardless of its position. Accordingly, a substrate can be guided along the XY plane with good accuracy.

A compressor having a compressor housing, a compressor rotor mounted in the compressor housing, which includes a shaft and moving blades forming multiple compressor stages. Between two compressor stages a magnetic bearing and a safety bearing are arranged, which, as split bearings, are each mounted on the shaft designed as one-piece shaft.

The present disclosure relates to a bicycle hub, and more particularly, to a levitating bicycle hub coupling structure using a magnet in the internal contact structure in order to upgrade the levitating non-contact type structure to reduce friction and enable the position of a hub inner shaft member for transmitting the load of a user to an inner bearing part and the like to be changed to an upper or lower preset position, and fixes the same at a changed position so as to offset the load applied to the shaft member by the repulsive force of the magnets, such that the load is not applied to the bearing parts positioned at both sides of the shaft member or is significantly reduced so as to improve rolling performance, and thus riding of the bicycle becomes smoother and easier; or has first and second internal magnet parts formed at the outer peripheries of both sides of the housing rotating by being connected to bicycle wheels, and has first and second external magnet parts corresponding to the first and second internal magnet parts so as to generate repulsive force, such that when the user gets on the bicycle, an eccentric load transmitted to the shaft member through a bicycle frame is supported by the repulsive force, thereby enabling the prevention of load being applied to the bearing parts.

A hydrodynamic or liquid metal or bearing structure for an x-ray tube and associated process for operating the bearing structure is provided that includes a bearing shaft rotatably disposed in a bearing housing or sleeve. Adjacent but separated by a gap from the portion of the sleeve enclosing the thrust flange is located an electromagnet. The electromagnet can be selectively operated in order to exert a magnetic force upon a permanent magnet disposed within the sleeve on the opposite side of the gap. The force exerted on the permanent magnet in the sleeve causes the sleeve to move axially along the shaft, such that the sleeve can engage one side of the thrust flange, landing the sleeve against the thrust bearing/surface to greatly reduce the wear on the sleeve as the sleeve rotation slows.

A hydrodynamic or liquid metal or bearing structure for an x-ray tube and associated process for operating the bearing structure is provided that includes a bearing shaft rotatably disposed in a bearing housing or sleeve. Adjacent but separated by a gap from the portion of the sleeve enclosing the thrust flange is located an electromagnet. The electromagnet can be selectively operated in order to exert a magnetic force upon a permanent magnet disposed within the sleeve on the opposite side of the gap. The force exerted on the permanent magnet in the sleeve causes the sleeve to move axially along the shaft, such that the sleeve can engage one side of the thrust flange, landing the sleeve against the thrust bearing/surface to greatly reduce the wear on the sleeve as the sleeve rotation slows.

In rotating machine having a vertically oriented rotating shaft, a static magnetic force is used to simulate rotor weight and create the desired bearing preload. By installing a magnet the gravity based preload on the shaft journal bearings of a horizontal machine can be simulated for a vertical shaft. This can increase rotor stability, reduce the machine's vulnerability to hydraulically induced imbalance forces and give a more smooth transition through various shaft speeds.