A monitoring device and a method for detecting mechanical torsional oscillations in a rotor shaft of a turbine-generator system. Specifically, the monitoring device and a method for detecting mechanical torsional oscillations in a turbine-generator system having a plurality of, such as two, three, four, five, six or more, turbines that are interconnected by means of a common turbine shaft.

A power tool system has a power tool including an electrical device, a power device for powering the electrical device, a position or target detection system for detecting a position of the power tool and/or the power device, a source-based transceiver for at least transmitting data corresponding to the position detected by the position detection system, and a data retrieval and/or process equipment for selectively receiving data from the source-based transceiver at a position around the power tool and/or a position remotely removed away from the power tool.

The present invention provides a rotating electric machine and a method of detecting electric discharge (a defect detection method for a rotating electric machine), which are able to early detect vibration sparking between a stator winding and a stator core. A rotating electric machine of the present invention comprises a cylindrical stator including a stator core and a stator winding, a rotor disposed inside the stator, at least one key bar disposed on an outer periphery of the stator core and extended in an axial direction of the stator, and at least one current detector disposed on the key bar and configured to measure a current flowing in the key bar.

The present disclosure provides a method for monitoring a rotor position sensor of a PSM machine having at least three phases operated by a field oriented control, where the electrical angle of the PSM machine may corresponds with a rotor position. A first calculation of the electrical angle of the PSM machine may be based on a measured mechanical rotor position and the pole-pair number of the PSM machine. A second calculation of the electrical angle of the PSM machine may be based on the phase of a phase current indicator and regulated target currents in the d,q-coordinate system. The method may include a comparison of the values of the respective electrical angles of the PSM machine determined by the first calculation and the second calculation.

In order to improve control of a long-stator linear motor, a first measured value is ascertained in a first measurement section and a second measured value is ascertained in a second measurement section, in each case along a transport path in a movement direction. The first measurement section overlaps, in the movement direction, the second measurement section in an overlap region, and the first measured value and the second measured value represent the same actual value of a physical quantity. An operating parameter of the long-stator linear motor determined based on a deviation occurring between the first measured value and the second measured value.

An abnormality determining apparatus for a motor driven mechanism includes circuitry. The circuitry is configured to acquire time-series data with respect to an input to and an output from a motor which drives the motor driven mechanism, detect data abnormality in the time-series data, and determine, based on the data abnormality, whether mechanical abnormality in the motor driven mechanism occurs.

An arrangement for monitoring the operation of a machine intended to be tracked by a real-time locating system comprises: a tag intended to be arranged on the machine, the tag being configured to generate a wireless tag signal allowing determination of a position of the tag; and at least one detector intended to be arranged on the machine, the at least one detector being configured to detect at least one characteristic of a magnetic field generated by the machine. Detection of the at least one characteristic is indicative of the machine being operative. The arrangement makes it possible to obtain a detailed understanding of how the machine is used in a cost-effective manner. A real-time locating system comprising such an arrangement and a method for monitoring the operation of a machine are also disclosed.

A system for detecting offset error in a power steering system is provided. The system includes a programmable high pass filter module configured to filter a final voltage command and generate a filtered final voltage command. The filtered final voltage command includes the sinusoidal component, a gain and phase compensation module configured to perform a gain compensation and a phase compensation on the filtered final voltage command to generate a compensated final voltage command. An error detection module is configured to determine an offset of the compensated final voltage command in a stator reference frame.

A rotating electric machine includes a stator and a rotor. An imaging device images a test target portion which is a part of the rotor, to generate image data of the test target portion, and transmits the generated image data to an image processing device. The image processing device generates strain change information representing change in the strain distribution in the test target portion by digital image correlation on the basis of the test image data generated by the imaging device. The state of the rotor is tested using the generated strain change information.

The present invention relates to switching element protection of a BLDC motor, such as used with a power tool. The present invention checks each switching element of a power stage individually for a short circuit when a trigger of the tool is actuated. Each switching element is turned ON for a period of time (such as 1-5 microseconds, for example), current flowing through the half-bridge or the full power stage is measured, and that switching element is turned OFF. When the current is greater than or equal to a threshold (such as 5 A, for example), the controller stops and indicates a fault condition. By testing each switching element in order, the controller is able to determine whether the shorted switching element is the opposite one in the half-bridge being tested.