The disclosure provides a magnetic suspension type quasi-zero stiffness electromagnetic vibration isolator with active negative stiffness. The disclosure relates to the technical field of vibration control. The disclosure can selectively realize passive negative stiffness and active negative stiffness by adjusting the control mode of a controller. By adopting an amplifying mechanism and DIESOLE type electromagnets, the bearing capacity of the vibration isolator is further increased, and the disclosure is suitable for the field of ultra-low frequency heavy load vibration reduction and isolation. The displacement state of a negative stiffness mechanism can be measured in real time according to a sensor, and by means of cooperation of the controller and a driver, active negative stiffness is realized, real-time linear negative stiffness is realized, the multi-stable phenomenon is avoided, and complex dynamic phenomena such as jumping during working of the vibration isolator are prevented. The active negative stiffness is realized, the current passing through the system can be adjusted according to different working conditions, and the system has strong self-adaptive ability, can be applied to vibration-isolated objects of different quality, and can adapt to different working environments.

A suspension device includes a damper. The damper includes: a ball screw; a ball screw nut screwed with the ball screw; a bearing that rotatably supports a nut unit (nut assembly) provided with the ball screw nut; and a housing that houses the bearing inside. A part between the housing and the bearing in an axial direction is provided with an elastic body.

An electrical machine (1) comprising: a rotatable drive shaft having a rotational axis (15); a rotor assembly (2) connected to the drive shaft, the rotor assembly 2 arranged to generate a static rotor magnetic field; a primary stator assembly (4), comprising a plurality of stator coils (5a, 5b) arranged to generate a rotating stator magnetic field for interacting with the static rotor magnetic field of the rotor assembly (2) such as to rotate the rotor assembly (2) along the rotational axis (15), and a secondary stator assembly (7) arranged to generate a static stator magnetic field; wherein the electrical machine (1) comprises a magnetic torsion spring (9) formed by the interaction of the static stator magnetic field with the static rotor magnetic field.

A tool includes a device including a housing and a rotor, the rotor to rotate about a longitudinal axis, and an axial gap generator including a stator assembly positioned adjacent to the rotor. The axial gap generator generates a voltage signal as a function of a gap spacing between the stator assembly and the rotor, the gap spacing being parallel to the longitudinal axis.

The present application discloses a component having a movably mounted component element of a projection exposure apparatus and in particular a movement limiting apparatus, and a method for limiting the movement of movable component elements of a component of a projection exposure apparatus.

A shock absorber comprising a generally tubular body defining a working chamber. A piston is slidable in the working chamber and separates a compression chamber from a rebound chamber of the working chamber. The working chamber contains damping fluid. The shock absorber comprises an electric generator fitted thereto. The generator comprises a turbine rotatably coupled to at least one magnet and coils adjacent the magnet. The shock absorber comprising a turbine flow path between the compression chamber and the rebound chamber, the turbine being supported for rotation in the turbine flow path driven to rotate by flow of damping fluid. Preferably the turbine flow path comprises a compression flow path and a rebound flow path and a turbine chamber, the compression flow path providing for flow of damping fluid from the compression chamber though the turbine chamber to the rebound chamber. One way valves are positioned in the compression and rebound flow paths so that flow only occurs in a respective flow path during compression and rebound of the piston. Movement of said damping fluid though either of said compression flow path or said rebound flow path causes the turbine to rotate in only one rotary direction to thereby generate an electric current in said at least one coil.

A resonator having a support and a seismic mass. Movement means include a first electromagnetic assembly comprising a first electric coil that is not electrically powered. An actuator is connected to a processor unit, the processor unit electrically powering the actuator with adjustable electrical power. A resilient member is interposed between said seismic mass and said support.

A swivel device with rotation damping, adapted to rotationally couple a hoist cable to a hoist hook, the device including: a first disc fixedly mounted on a central axle and adapted to be operationally coupled to a distal end of the cable by a non-rotating coupling; a second disc rotationally mounted on the central axle and spaced apart from the first disc, the second disc adapted to be operationally coupled to the hoist hook by a non-rotating coupling; a first set of magnets mounted on the first disc; and a second set of magnets mounted on the second disc, magnetic fields of the first set of magnets interacting with magnetic fields of the second set of magnets to damp rotation of the second disc about the central axle.

A vehicle powertrain proactive damping system includes a plurality of proactive damping structures mounted on a powertrain structure with each proactive damping structure includes a magneto rheological elastomer (MRE). An electromagnet is associated with each proactive damping structure. A control unit includes a processor circuit. A sensor obtains vibration data regarding the powertrain structure. A LIDAR sensor is mounted on the vehicle and is electrically connected with the control unit. The LIDAR sensor provides data to the control unit indicative of upcoming road surface conditions to be experienced by the vehicle. Based on data from at the sensor and the LIDAR sensor, the processor circuit is constructed and arranged to control voltage to the electromagnets to selectively adjust a rigidity of the associated proactive damping structure so as to control vibrational effects on the powertrain structure.

An active vibration controller includes: a housing; a first magnetic member installed on the side of the housing having a toric shape; a movable member including a second magnetic member that is substantially coaxial with the first magnetic member and disposed inside the toric shape of the first magnetic member; an exciting coil that generates a magnetic field in accordance with an intensity of a current supplied thereto; and a magnetic viscoelastic elastomer that has a magnetic viscoelastic property varying in accordance with a magnitude of the magnetic field from the exciting coil between the first and second tip portions, and connects the first magnetic core to the second magnetic core. The magnetic viscoelastic elastomer has a region having a non-magnetic property between the first and the second magnetic cores.