An electric motor system includes a rotary shaft having an axis line displaceable relative to a rotation center, a magnetic bearing for supporting the rotary shaft, a permanent magnet mounted on the rotary shaft and having a plurality of magnetic poles arranged in a circumferential direction around the axis line of the rotary shaft, three detection elements arranged in the circumferential direction around the rotation center for detecting a magnetic flux generated from the permanent magnet, and a coordinate detection section for determining coordinates of the axis line of the rotary shaft based on output values of two detection elements selected out of the three detection elements in accordance with a rotation angle of the rotary shaft.

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.

An active radial magnetic bearing assembly for a rotating machine. The active radial magnetic bearing assembly may include a housing comprising a center axis, a stator coupled to the housing, a rotor, a first target, a second target, and a plurality of sensors. At least a portion of the rotor may be configured to rotate about the center axis within the stator. The first target may be a portion of a rotor outer surface and the second target may be coupled to or formed by the rotor. The plurality of sensors may be coupled to the stator and adjacent a stator inner surface. Each sensor of the plurality of sensors may detect at least one of a radial position and an axial position of the rotor via the first target or the second target.

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.

Multi-dimensional magnetic levitation and translation systems include at least one electromagnets located on each of three perpendicular axes. The at least three electromagnets are operated using a control system to apply a nonphysical force on objects contained within the magnetic field. An object is able to be levitated within the system in spite of any variable acceleration the system experiences due to the environment. The multi-dimensional magnetic levitation system is able to linearly translate an object within its volume of control.

A magnetic bearing is disclosed. A group of permanent magnets are physically attached to a group of piezoelectric actuators which push them toward or pull them away from a second group of permanent magnets when the piezoelectric actuators are electrically activated. A control unit energizes the piezoelectric actuators to provide a dynamic magnetic bearing. The second group of permanent magnets may also be pushed and pulled with a second group of piezoelectric actuators. Alternate configurations using electromagnets are also disclosed.

A novel configuration for the groups of electromagnets which maximizes efficiency in a piezoelectrically actuated magnetic bearing is also disclosed.

An electric motor system includes a rotary shaft having an axis line displaceable relative to a rotation center, a magnetic bearing for supporting the rotary shaft, a permanent magnet mounted on the rotary shaft and having a plurality of magnetic poles arranged in a circumferential direction around the axis line of the rotary shaft, three detection elements arranged in the circumferential direction around the rotation center for detecting a magnetic flux generated from the permanent magnet, and a coordinate detection section for determining coordinates of the axis line of the rotary shaft based on output values of two detection elements selected out of the three detection elements in accordance with a rotation angle of the rotary shaft.

A magnetic bearing is provided. The magnetic according to the present disclosure includes: a stator core disposed to surround a central axis; a plurality of bobbins coupled to the stator core; a coil wound around the bobbin; and a positioning member coupled to the plurality of bobbins and determining positions of the plurality of bobbins, and the positioning member has a circular shape centered on a central point.

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.

A turbine generator contains a turbine part and a generator part. The turbine contains a turbine wheel. A sealing arrangement is arranged between the turbine wheel and the generator part, the sealing effect of which varies during operation. The generator part further has a generator shaft, which is supported by an axial bearing configured as a magnetic bearing with two coils axially spaced apart from each other. A bearing ring is arranged between these coils with an axial distance from the coils. To ensure a safe operation, a setpoint value for the axial distance is varied to change the sealing effect of the sealing arrangement. Alternatively or additionally, it is provided that when a current threshold of a coil current is exceeded, a control signal is emitted to control the flow of the medium or the rotational speed.