Abstract: Rotating machine vibration monitoring process for detecting degradations within a rotating machine providing an output axle fitted with magnetic bearings, the magnetic bearings having at least a position sensor and at least a magnetic actuator, the process provides the following steps: 1) defining a set of excitations that does not destabilizes the rotating machine, 2) injecting the set of excitations in the rotating machine through the magnetic actuators and 3) measuring the response of the rotating machine checking whether the response verifies at least one predefined criterium, 4) if it is not the case, adjusting the properties of the set of excitations and resuming the process at the injection step, 5) if the response verifies the at least one criterium, determining at least one condition indicator based on the response measured, 6) determining if an alarm is to be triggered based on the condition indicator determined.

Abstract: A device for estimating the sensitivity of a position sensor for a magnetic bearing supporting a rotor, the sensor being capable of measuring the position of the rotor in relation to the magnetic bearing, the magnetic bearing including at least one shaft provided with at least two radially opposite coils. The device includes a control, a current-measuring component, a component for measuring the initial position of the rotor, a component for determining a variation in currents, a component for determining a movement of the rotor, and a component for determining the sensitivity of the sensor, configured to determine the sensitivity of the position sensor based on a movement setpoint and on the value of a movement of the rotor.

Abstract: The method for obtaining a temporal model of a magnetic bearing provides the generation of reference data representative of characteristics of the bearing. The method includes the production of the temporal model of the magnetic bearing from the reference data having temporal data.

Abstract: The present invention relates to a transmission belt providing a belt member, and at least one RFID tag attached to the belt member, the at least one RFID tag including an integrated circuit, and an antenna connected to the integrated circuit for transmitting a signal indicative of a state of the transmission belt. The signal indicative of the state of the transmission belt is determined on the basis of a current deflection of the antenna.

Abstract: A rotor for rotary electrical machine. The rotor providing a shaft and magnets supported by the shaft. The rotor further provides a protecting sleeve, extending around an outer surface of the magnets and being made at least partially of PEEK or epoxy resin.

Abstract: A method for estimating the temperature of a stator coil of a magnetic suspension bearing of a rotor that is connected by connection wires to circuits for servo-controlling the position of the rotor includes the following steps: measuring the electric voltage at the terminals of the connection wires of the stator coil; measuring the intensity of the current passing through the stator coil; estimating the electric resistance of the stator coil and of the connection wires on the basis of an adaptive filter, the measured electric voltage and the intensity of the measured current; and estimating the temperature of the coil on the basis of the value of the estimated resistance.

Abstract: A lamination stack for use in a rotating electrical machine includes a plurality of sheets of ferritic material. Each of the sheets has first and second sides that include asperities, and the asperities have a height of about two microns and a width of about two microns. A layer of electrically insulating material is provided between adjacent pairs of the ferritic sheets in the stack, and the asperities extend into the electrically insulating material.

Abstract: Condition monitoring device including a condition monitoring sensor configured to acquire vibration signals produced by the system and an integrated power supply having an energy harvester for providing power energy to the condition monitoring sensor and having an electromagnetic coil and a permanent magnet. The integrated power supply includes a system power switch between the energy harvester and the condition monitoring sensor and configured to be switched between at least a first high impedance position providing power energy of the energy harvester to the sensor and a second low impedance position where no power is transmitted to the sensor. Also, a system for restricting movement of the energy harvester configured to be connected across the electromagnetic coil in the low impedance passive position of the system power switch.

Abstract: System for controlling at least one active magnetic bearing equipping a rotating machine comprising a rotor and a stator, at least one means for measuring the radial positions of the rotor as a function of the signal from at least one position sensor, and at least two control loops of the active magnetic bearing as a function of the radial positions of the rotor, each control loop of the magnetic bearing being provided with at least one synchronous filter as a function of the rotation speed, and an extended Kalman filter for determining the rotation speed of the rotor with respect to the stator receiving as input, from position sensors, measurements of radial position of the rotor and as a function of measurements of radial position of the rotor performed over a predetermined time at zero rotor rotation speed.

Abstract: A sensor for operating in an environment subjected to corrosive gases or liquids under pressure, including a housing inside which are installed: a sensing portion, at least one wire electrically connected to the sensing portion, and a seal for sealing the connection between the sensing portion and the at least one wire, with at least one through-hole receiving a portion of the at least one wire. The sensor further including a compressor installed inside the housing, movable with respect to the housing and adapted to contact the seal in order to compress. The seal is made from a single material that is softer than the material constituting the housing. Upon displacement of the compressor, the seal is deformed until the creation of a compression force exerted by the seal onto the portion of the at least one wire, prevents any passage of corrosive gases or liquids between the seal therebetween.

Abstract: 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.

Abstract: A radial magnetic bearing assembly having an unsymmetrical stator. The assembly comprises fewer or smaller electromagnets, and thus capacity, in the two lower quadrants below the rotor in use, in comparison to the electromagnets, and thus capacity, in the two upper quadrants above the rotor in use. This creates space in the two lower quadrants that can advantageously be used to move for example instrumentation and cooling from other places of the assembly to make the bearing assembly compactor, and also to be able to put instrumentation and cooling where it is best needed, close to the rotor.

Abstract: The invention relates to a method of manufacturing a lamination stack used in a rotating electrical machine. The method includes providing naked sheets made of ferritic material; preparing both sides of each sheet so as to obtain a determined surface roughness; coating at least one side of each sheet with an chemically protective electrically insulating material; stacking the coated sheets; compressing the stack obtained; heating the compressed stack at a temperature above the melting temperature of the insulating material; and cooling down the compressed stack so as to form an integral lamination stack consisting of alternating sheets of ferritic material and layers of insulating material. The invention also relates to an electrical machine comprising such a lamination stack.

Abstract: A landing bearing assembly for a rotary machine having a stator assembly, a rotor assembly and a magnetic bearing. The landing bearing assembly having a stator landing portion integral with the stator assembly and a rotor landing portion integral with the rotor assembly. A first coating, which is an anti-wear and/or an anti-friction coating, is dispensed on at least one of the stator landing portion and the rotor landing portion. The invention also concerns such a rotary machine.

Abstract: A method of protecting ferromagnetic lamination stacks of a component of an electric machine, comprises the following steps: creating a component module by arranging a laminations stack of ferromagnetic sheets into a housing, (b) protecting locations of the component module where coating is unwanted, (c) inserting the component module into a hermetic chamber receiving an ionized gas, (d) polarizing the component module to submit a fixed electric potential to the component module, (e) depositing a thin layer of protective coating on the laminations stack of ferromagnetic sheets through a method of Plasma Enhanced Chemical Vapor Deposition (PECVD) at a temperature lower than 150° C., (f) monitoring the deposition homogeneity and deposition thickness of the thin layer of protective coating until desired thickness, and (g) rectifying the surface of the thin layer of protective coating to have a uniform protective layer.

Abstract: A landing bearing assembly for a rotary machine rotatable around a central axis and having a stator, a rotor with a shaft, a magnetic bearing, an auxiliary rolling bearing with two lateral faces, a landing sleeve facing, in normal operation of the rotary machine when the rotor is supported only by the magnetic bearing, the auxiliary rolling bearing at a nominal distance defined as the landing airgap El, the auxiliary rolling bearing coming into contact with the landing sleeve upon landing of the rotor in the event of a high shock. The assembly further provides a compliance ring with a nominal thickness Eo made from a material with a lower mechanical stiffness than the material constituting the other components of the landing bearing assembly to first absorb some energy of the shock by elastic deformation resulting in a reduction of its thickness.

Abstract: A balancing method for balancing at high speed a flexible rotor of a rotary machine, the rotary machine having a stator, and the rotor being supported in the stator by at least two radial magnetic bearings. The balancing method including a step of placing the rotor inside the stator, a step of performing at least one first run in order to identify amplitude and angular location of the unbalance in a first speed range below critical speed, a step of placing first balancing masses inside the rotor on predefined first balancing planes, a step of performing at least one second run in order to identify amplitude and angular location of the unbalance in a second speed range above critical speed, and a step of placing second balancing masses inside the rotor on predefined second balancing planes.

Abstract: A stator assembly having a housing and a stator that are concentric, the stator being mounted radially inside the housing is provided. This stator assembly includes fastening elements that are mounted between a radial inner surface of the housing and a radial outer surface of the stator and exert a radial fastening force on the housing and the stator.

Abstract: A thrust disc for a magnetic bearing, wherein the thrust disc comprises: a body, which is adapted to be mounted on a shaft and which has a first offset yield strength and a first magnetic permeability, and at least one flange which is fixed to the body in a position where it can interact with a thrust stator in order to form a magnetic bearing and which has a second offset yield strength and a second magnetic permeability; wherein the first offset yield strength is higher than the second offset yield strength; and wherein the first magnetic permeability is smaller than the second magnetic permeability. Additionally, the magnetic bearing can be equipped with such a thrust disc. An apparatus can be equipped with such a magnetic bearing.

Abstract: A rotary machine, comprising: a stator assembly and a rotor assembly centered on a central axis; a magnetic bearing; and an auxiliary bearing including a first ring held in the stator assembly and a second ring delimiting a gap radially to the central axis relative to the rotor. The second ring is not rotating around the central axis in a primary operation mode and is dragged in rotation around the central axis in a secondary operation mode. The rotary machine includes a monitoring system for detecting a transition from the primary operation mode to the secondary operation mode. The monitoring system comprises a target formed on the second ring and a sensor unit fixed relative to the stator assembly. A bearing and a method for manufacturing a rotary machine are additionally disclosed.