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.

A ball joint is disclosed containing a body of a joint, where there is inserted a pin having a longitudinal axis and including a first threaded end and a second spherical end which is rotatably arranged within a seat of the body and able to co-operate with a first spherical-cap-shaped element or shell inserted within a seat having a corresponding shape of a second spherical-cap-shaped element or shell cooperating with a covering element so as to close the spherical end of the pin within the body. The second spherical end of the pin and the first and second shells including pairs of recesses and ridges in the contact areas are suitable for reciprocally compenetrating, with the pairs of recesses and ridges being arranged at 90° to each other to allow the rotation of the pin along all axes in the space (X, Y, Z). An angular movement sensor integral with the body of the joint is provided, for co-operating with the second element or shell to detect the rotation of the pin around the axis containing the longitudinal axis of the pin.

A method of determining the center of loading of a rolling element includes providing a rolling element body and at least three load sensors. The sensors are each positioned within a bore of the rolling element body at a separate distance from a reference position. Load measurements are taken with each one of the sensors at various positions about the circumference of the bearing and the center of loading is calculated at each one of the positions to determine the variation in axial loading about the bearing circumference.

The present disclosure relates to an ultrasonic imaging apparatus that has a tolerance for easy assembly and reduces shaking and noise by reducing the tolerance after assembly. The ultrasonic imaging apparatus includes a main body, a probe connected to the main body to irradiate and receive ultrasonic waves and to transmit the ultrasonic signals to the main body, a control panel configured to control the main body or the probe, and a moving device configured to connect the control panel and the main body and to move the control panel with respect to the main body in the upward and downward directions, wherein the moving device includes a housing fixed to the main body, a moving member configured to be movable with respect to the housing in the upward and downward directions, and a regulating bearing installed in the housing and configured to assist the upward and downward movement of the moving member by coming into rolling contact with the moving member and to regulate a gap with the moving member.

A bearing configured to actively damp vibration of a shaft in a turbine. In one implementation, the bearing can include actuating members that move in a manner that changes properties of fluid, typically a thin film of lubricant, disposed in the bearing to facilitate rotation of the shaft. These changes effectively manipulate the stiffness and damping of the thin film according to a time periodicity that matches a parametric anti-resonance of the bearing. In turn, the resulting interaction of vibrating modes is favorable to damp vibration amplitudes at critical speeds.

The present invention resides in a sensorized roller of a roller bearing. The sensorized roller includes a roller bore that accommodates a measuring device for measuring deformation of the roller bore and electronics for processing a deformation signal from the measuring device and wirelessly transmitting the processed deformation signal to an external receiver. According to the invention, the measuring device and electronics are mounted in a rigid housing that is shaped to fit within the roller bore. A radially outer surface of the housing includes at least one aperture associated with the measuring device. Furthermore, the rigid housing is resiliently mounted to the roller bore via first and second sealing elements that enclose a radial gap between a radially inner surface of the roller bore and a radially outer surface of the housing.

A device monitors the operating temperature of at least one set of bearings in a plurality of sets of bearings. The at least one set of bearings is arranged between a shaft and a carrier. The carrier has at least one temperature sensor that senses the temperature of the at least one set of bearings and generates a signal representative of an operating temperature of the at least one set of bearings. The at least one temperature sensor is operatively electrically connected to at least one controller. The controller processes the signal from the temperature sensor, including determining the operating temperature of the respective at least one set of bearings and whether the operating temperature of the respective at least one set of bearings exceeds at least one threshold temperature. The controller memory holds a unique identifier associated with the at least one bearing set.

A sensor cap exchange tool device may include a support bolt; a support bracket that is fixed to a front end portion of the support bolt; a mover that has a second screw thread that is engaged with the first screw thread at of the support bracket; a tool guide that is rotatably engaged with the mover and that moves in the predetermined direction together with the mover according to a rotation of the mover and that has a tool insertion opening open in the predetermined direction; and a separation device and mounting device that are mounted in the tool guide and that moves with the tool guide according to a rotation of the mover and that comes in close contact with the sensor cap that is mounted in the wheel bearing assembly.

A bearing monitoring system for an air cycle machine includes a housing. Also included is a compressor disposed within the housing. Further included is a turbine disposed within the housing. Yet further included is an axial shaft operatively coupled to the compressor and the turbine, the axial shaft disposed within the housing and between a first plurality of bearings. Also included is a radial shaft extending from the axial shaft, the radial shaft disposed within the housing and between a second plurality of bearings. Further included is at least one sensor mounted to the housing and oriented to monitor deflection of the radial shaft.

A roller bearing includes an outer ring, an inner ring, at least one row of rollers arranged between the outer ring and the inner ring, and at least one optical fiber cable mounted to the outer ring or the inner ring, the optical fiber cable including at least one Bragg grating. The optical fiber cable is configured such that a signal in the optical fiber cable is usable to determine a preload or load on the roller bearing.