An electric submersible pump (ESP) assembly. The ESP assembly comprises a centrifugal pump, an electric motor mechanically coupled by a drive shaft to the centrifugal pump, wherein the electric motor comprises a stator and a rotor, a bearing, wherein the bearing is disposed inside the electric motor, and a magnetic shield disposed in the electric motor between bearing and the rotor and stator.

A heart pump including a housing forming a cavity including at least one inlet and at least one outlet, an impeller provided within the cavity, the impeller including vanes for urging fluid from the inlet to the outlet upon rotation of the impeller, a drive that rotates the impeller within the cavity, a magnetic bearing including at least one bearing coil that controls an axial position of the impeller within the cavity and a controller. The controller includes an electronic processing device that monitors changes in a bearing indicator in response to a perturbation in blood flow, the bearing indicator being at least partially indicative of operation of the magnetic bearing and controls the drive to thereby selectively change a rotational speed of the impeller at least partially in accordance with changes in the bearing indicator.

A heart pump including a housing forming a cavity including at least one inlet and at least one outlet, an impeller provided within the cavity, the impeller including vanes for urging fluid from the inlet to the outlet upon rotation of the impeller, a drive that rotates the impeller within the cavity, a magnetic bearing including at least one bearing coil that controls an axial position of the impeller within the cavity and a controller. The controller includes an electronic processing device that monitors changes in a bearing indicator in response to a perturbation in blood flow, the bearing indicator being at least partially indicative of operation of the magnetic bearing and controls the drive to thereby selectively change a rotational speed of the impeller at least partially in accordance with changes in the bearing indicator.

An electric stator surrounds an electric rotor. A magnetic coupling is attached to an end of the electric rotor. The magnetic coupling is configured to transmit rotational force to or from a separate rotational device. A housing surrounds and isolates the electrical rotor, the electric stator, and a portion of the magnetic coupling, from a wellbore fluid. The housing is flooded with an incompressible fluid. A pressure within the housing is substantially the same or lower than a pressure within a wellbore environment.

A cross-flow fan includes a cylindrical impeller having an annularly designed first magnetically effective core disposed at a first end, an annularly designed second magnetically effective core disposed at a second end, a plurality of vanes arranged between the first magnetically effective core and the second magnetically effective core, a first stator, which is a bearing and drive stator, and which interacts with the first magnetically effective core as a first electromagnetic rotary drive, and a second stator, which is at least a bearing stator, and with which the second magnetically effective core is capable of being magnetically levitated without contact with respect to the second stator. The impeller is magnetically driven without contact by the first and the second stators and magnetically levitated without contact with respect to the first stator and the second stator.

A cross-flow fan includes a cylindrical impeller having an annularly designed first magnetically effective core disposed at a first end, an annularly designed second magnetically effective core disposed at a second end, a plurality of vanes arranged between the first magnetically effective core and the second magnetically effective core, a first stator, which is a bearing and drive stator, and which interacts with the first magnetically effective core as a first electromagnetic rotary drive, and a second stator, which is at least a bearing stator, and with which the second magnetically effective core is capable of being magnetically levitated without contact with respect to the second stator. The impeller is magnetically driven without contact by the first and the second stators and magnetically levitated without contact with respect to the first stator and the second stator.

A centrifugal fluid pump with a fully magnetically suspended rotor to improve blood compatibility when pumping blood is disclosed. The pump stabilizes radial displacements of a disc-like rotor with active control through separate electric motor and magnetic bearings to improve the pump's critical performances including device packaging size, system simplicity and reliability, stiffness and other dynamic performances of suspension, power efficiency, and others.

A centrifugal fluid pump with a fully magnetically suspended rotor to improve blood compatibility when pumping blood is disclosed. The pump stabilizes radial displacements of a disc-like rotor with active control through separate electric motor and magnetic bearings to improve the pump's critical performances including device packaging size, system simplicity and reliability, stiffness and other dynamic performances of suspension, power efficiency, and others.

A magnetic bearing contactlessly supporting a rotor by magnetic force includes: a bearing rotor member made of a magnetic material; and a bearing stator member arranged around bearing rotor member. The bearing stator member includes a core made of a magnetic material and a coil wound around the core. A longitudinal cross-sectional shape of the core has a first part extending in a first direction orthogonal to a direction opposed to the bearing rotor member and wound around with the coil, a pair of second parts extending from both end portions in the first direction of first part to the bearing rotor member side and subsequently extending in a direction approaching each other in the first direction, and a pair of third parts extending from respective distal end portions of the pair of second parts toward the bearing rotor member side. The bearing rotor member also includes a permanent magnet.

This disclosure relates to a refrigerant compressor including a magnetic bearing assembly, and more particularly, to insulation for use in connection with the magnetic bearing assembly. In some aspects, the techniques described herein relate to a refrigerant compressor including an electric motor configured to rotationally drive an impeller via a shaft, and a radial magnetic bearing assembly including a lamination stack coated with an epoxy material.