Abstract: A malfunction detection device provided with an acquisition unit, a cutout unit, a feature extraction unit, a learning unit, and a deviation degree computation unit. The acquisition unit is configured to acquire device data. The cutout unit is configured to cut out data from the acquired device data based on predetermined conditions. The feature extraction unit is configured to extract a feature vector from the cut-out device data. The learning unit is configured to analyze the extracted feature vector. The learning unit is configured to generate a model of the feature vector based on analysis results. The deviation degree computation unit is configured to compute a degree of deviation between a feature vector of newly acquired device data and the model of the feature vector.

Abstract: A power conversion apparatus comprises a bidirectional conversion circuit that enables first conversion converting DC to AC and second conversion converting AC to DC and a filter circuit that is provided on an AC side of the bidirectional conversion circuit and that includes a capacitor. A control unit is provided for performing control such that the bidirectional conversion circuit makes the first conversion during the former stage of each half cycle of AC voltage, and such that the bidirectional conversion circuit makes the second conversion during the latter stage of each half cycle of AC voltage. The control unit performs control such that AC current of an opposite polarity to that of the AC voltage flows to the AC side during the former stage and AC current of the same polarity as that of the AC voltage flows to the AC side during the latter stage.

Abstract: A power factor correcting device that controls switching of a converter that converts AC voltage inputted via a circuit with a capacitor through which reactive current flows into DC voltage calculates the magnitude of the reactive current based on the magnitude of the AC voltage inputted to the converter and the capacitance of the capacitor and corrects a power factor including the circuit, calculates a target value for a phase delay of the AC current with respect to the AC voltage based on the calculated magnitude and the magnitude of the AC current inputted to the converter or the magnitude of the DC power outputted from the converter, and calculates an operation amount for delaying the phase of the switching based on the calculated target value.

Abstract: A power conversion apparatus comprises a bidirectional conversion circuit that enables first conversion converting DC to AC and second conversion converting AC to DC and a filter circuit that is provided on an AC side of the bidirectional conversion circuit and that includes a capacitor. A control unit is provided for performing control such that the bidirectional conversion circuit makes the first conversion during the former stage of each half cycle of AC voltage, and performing control such that the bidirectional conversion circuit makes the second conversion during the latter stage of each half cycle of AC voltage. The control unit performs control such that AC current of an opposite polarity to that of the AC voltage flows to an AC side of the bidirectional conversion circuit during the former stage and performs control such that AC current of the same polarity as that of the AC voltage flows to the AC side of the bidirectional conversion circuit during the latter stage.

Abstract: A power factor correcting device that controls switching of a converter that converts AC voltage inputted via a circuit with a capacitor through which reactive current flows into DC voltage calculates the magnitude of the reactive current based on the magnitude of the AC voltage inputted to the converter and the capacitance of the capacitor and corrects a power factor including the circuit, calculates a target value for a phase delay of the AC current with respect to the AC voltage based on the calculated magnitude and the magnitude of the AC current inputted to the converter or the magnitude of the DC power outputted from the converter, and calculates an operation amount for delaying the phase of the switching based on the calculated target value.

Abstract: Segment coils arranged as aligned in slot portions of an annular core each include a straight portion and a pair of coil end portions, and have a tip end of the coil end portion of the pair of coil end portions as a tip end portion for joint including a joint surface for joint to another segment coil. The tip end portion for joint has the joint surface in parallel to a radial direction of the annular core when viewed in an axial direction of the annular core.

Abstract: Each of segment coils arranged as aligned in a slot of a stator core includes a coil central portion accommodated in the slot and two coil end portions protruding outward. The coil end portion of the two coil end portions includes a pair of coil pieces formed by inclining a coil at different angles toward the coil central portion with a vertex lying therebetween. Any one of the pair of coil pieces includes in a region in the vicinity of the vertex, a recessed step portion formed from two sides in non-parallel to and at an angle with respect to an end surface of the stator core.

Abstract: A superconducting coil and a rotating device, the performances of which are improved, and a superconducting coil manufacturing method are provided. A superconducting coil 10 is a saddle-shaped superconducting coil formed by winding a superconducting wire so as to form a race-track-like shape. The superconducting coil includes a curved portion 10b and a straight portion 10a connected to the curved portion 10b. In the curved portion 10b, an upper edge 10c is positioned closer to an inner peripheral side than a lower edge 10d is, and in the straight portion 10a, the upper edge 10c is positioned closer to an outer peripheral side than the lower edge 10d is.

Abstract: Each of segment coils arranged as aligned in a slot of a stator core includes a coil central portion accommodated in the slot and two coil end portions protruding outward. The coil end portion of the two coil end portions includes a pair of coil pieces formed by inclining a coil at different angles toward the coil central portion with a vertex lying therebetween. Any one of the pair of coil pieces includes in a region in the vicinity of the vertex, a recessed step portion formed from two sides in non-parallel to and at an angle with respect to an end surface of the stator core.

Abstract: A segment coil capable of achieving effective prevention of magnetic flux leakage or eddy current and enhancing efficiency of a motor is provided. Segment coils in stator of a rotating electric machine including an annular core and rectangular wire coils in a plurality of layers, which are attached on an innermost circumferential side in a direction of radius of a slot formed in an inner circumferential portion of the annular core and are opposed to a rotor, are each constituted of a plurality of divided wires as divided in a circumferential direction of the annular core. The plurality of divided wires are integrally joined in coil end portions extending from the slot.

Abstract: Segment coils arranged as aligned in slot portions of an annular core each include a straight portion and a pair of coil end portions, and have a tip end of the coil end portion of the pair of coil end portions as a tip end portion for joint including a joint surface for joint to another segment coil. The tip end portion for joint has the joint surface in parallel to a radial direction of the annular core when viewed in an axial direction of the annular core.

Abstract: A superconducting coil and a rotating device, the performances of which are improved, and a superconducting coil manufacturing method are provided. A superconducting coil 10 is a saddle-shaped superconducting coil formed by winding a superconducting wire so as to form a race-track-like shape. The superconducting coil includes a curved portion 10b and a straight portion 10a connected to the curved portion 10b. In the curved portion 10b, an upper edge 10c is positioned closer to an inner peripheral side than a lower edge 10d is, and in the straight portion 10a, the upper edge 10c is positioned closer to an outer peripheral side than the lower edge 10d is.

Abstract: There is provided a power conversion device having no limitation on a voltage on each of an input side and an output side, being compact, and involving a low loss. The power conversion device is characterized by including: a rectifying unit 10 that rectifies an alternating current; a voltage step-up/step-down unit 20 that includes an element 23 for correcting a power factor, and that steps up or down a DC voltage from the rectifying unit; a central capacitor 15 that is charged by the DC voltage and discharges the voltage to an output section at a rear stage; a first front-stage switching element 11 and a second front-stage switching element 12 serially arranged between the voltage step-up/step-down unit and the central capacitor; a first rear-stage switching element 16 and a second rear-stage switching element 17 serially arranged between the central capacitor and the output section; and a control unit that controls the foregoing constituents.

Abstract: A direct current relay includes a plurality of contact pairs, and a plurality of magnets (5). Each of the plurality of contact pairs is configured having contacts (21, 22, 31) with contact regions (21a, 22a, 31a) disposed to allow opening and closure with respect to each other. The plurality of contact pairs are disposed such that the plurality of magnets (5) are disposed on one straight line, and the contact pairs are located between the magnets (5) on a line identical to the straight line. Each of the plurality of magnets (5) is provided to distort an arc generated between contacts (21, 22, 23, 31) on an occasion of relay cut off in a direction crossing the straight line. Even if a backward current flows, arcs will not interfere with each other, allowing extinguishing in a short time.

Abstract: A direct current relay includes a plurality of contact pairs, and a plurality of magnets (5). Each of the plurality of contact pairs is configured having contacts (21, 22, 31) with contact regions (21a, 22a, 31a) disposed to allow opening and closure with respect to each other. The plurality of contact pairs are disposed such that the plurality of magnets (5) are disposed on one straight line, and the contact pairs are located between the magnets (5) on a line identical to the straight line. Each of the plurality of magnets (5) is provided to distort an arc generated between contacts (21, 22, 23, 31) on an occasion of relay cut off in a direction crossing the straight line. Even if a backward current flows, arcs will not interfere with each other, allowing extinguishing in a short time.