A thrust magnetic bearing includes a stator having a coil that produces a magnetic flux, and a rotor. The magnetic flux supports the rotor in a non-contact manner. The stator has main and auxiliary stator magnetic pole surfaces. The rotor has main and auxiliary rotor magnetic pole surfaces. The main and auxiliary rotor magnetic pole surfaces face the main and auxiliary stator magnetic pole surfaces. The auxiliary stator magnetic pole surface includes at least one first stator surface and at least one second stator surface, alternately arranged. The auxiliary rotor magnetic pole surface includes at least one first rotor surface, and at least one second rotor surface, alternately arranged. Nr≥1 and Nt≥2, with Nr representing a number of pairs of the first stator and rotor surfaces facing each other, and Nt representing a number of pairs of the second stator and rotor surfaces facing each other.

In certain embodiments, apparatus for self-aligning elements of coupled platforms includes a radially repulsive magnetic bearing. The radially repulsive magnetic bearing includes a first axially polarized magnet and a second axially polarized magnet that is concentrically disposed around the first axially polarized magnet and radially repulsive to the first axially polarized magnet. The radially repulsive magnetic bearing is configured to align a first element of a first platform with a second element of a second platform when the first and second platforms are coupled together.

A thrust magnetic bearing includes a stator having a coil that produces a magnetic flux, and a rotor. The magnetic flux supports the rotor in a non-contact manner. The stator has main and auxiliary stator magnetic pole surfaces. The rotor has main and auxiliary rotor magnetic pole surfaces. The main and auxiliary rotor magnetic pole surfaces face the main and auxiliary stator magnetic pole surfaces. The auxiliary stator magnetic pole surface includes at least one first stator surface and at least one second stator surface, alternately arranged. The auxiliary rotor magnetic pole surface includes at least one first rotor surface, and at least one second rotor surface, alternately arranged. Nr≥1 and Nt≥2, with Nr representing a number of pairs of the first stator and rotor surfaces facing each other, and Nt representing a number of pairs of the second stator and rotor surfaces facing each other.

A downhole-type system includes a rotatable shaft; a sensor that can sense an axial position of the shaft and generate a first signal corresponding to the axial position of the shaft; a controller coupled to the sensor, in which the controller can receive the first signal generated by the sensor, determine an amount of axial force to apply to the shaft to maintain a target axial position of the shaft, and transmit a second signal corresponding to the determined amount of axial force; and multiple magnetic thrust bearings coupled to the shaft and the controller, in which each magnetic thrust bearing can receive the second signal from the controller and modify a load, corresponding to the second signal, on the shaft to maintain the target axial position of the shaft.

A sealed induction motor for a chiller assembly is provided. The induction motor includes a stator, a rotor, and a shaft with a first end and a second end. The rotor and the shaft are configured to rotate relative to the stator. The induction motor further includes a first magnetic bearing assembly located proximate the first end of the shaft and a second magnetic bearing assembly located proximate the second end of the shaft. The first and the second magnetic bearing assemblies are configured to support the shaft. The shaft is coupled to a centrifugal compressor using a direct drive connection.

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.

The present invention discloses a magnetic bearing of a stator permanent magnet motor with magnetic pole bypasses and a bias force adjusting method thereof, and belongs to the technical field of power generation, power transformation or power distribution. A typical magnetic field loop formed by permanent magnets extending out of stator sections, radial magnetic conduction bridges, circumferential magnetic conduction bridges, magnetic collecting shoes, radial/axial working air gaps and magnetic conduction blocks of radial/axial magnetic field closed main loops is used for designing the magnetic pole bypasses, so as to achieve the distribution of the magnetic field energy with multiple paths and controllable magnetic field strength of the permanent magnets in the stator permanent magnet motor. The present invention further provides a bias magnetic circuit structure. The number of magnetic poles and the magnetic field strength of a bias magnetic field are adjusted by selecting the materials of connecting sections between magnetic collecting blocks and the volume embedded in adjacent magnetic collecting blocks, so as to adjust the bias force of the magnetic pole, the space at an end of a motor winding is used to the greatest extent, the axial length of a magnetic suspension bearing motor system is reduced, the dynamic performance of a rotor is improved, and the objectives of high compactness and high integration level of “a magnetic suspension bearing and a permanent magnet motor system” are achieved.

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 system for compensating for the stresses applied to a bearing that rotatably supports a rotor shaft of a rotating machine relative to a stator of the machine. The system provides at least one sensor for measuring an input signal positioned on an element of the bearing, a module for acquiring the input signal configured to convert the input signal into a value of the deformation applied to the rolling bearing, a module for determining a compensation signal as a function of the deformation value, and an amplifier module configured to control a magnetic actuator rotatably supporting the shaft of the rotor and including at least one electromagnet, the amplifier module being configured to convert the compensation signal into a voltage signal transmitted to the electromagnet of the magnetic actuator, the magnetic actuator being configured to exert a force on the rotor shaft as a function of the voltage signal.

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.