Abstract: A phase-to-phase insulation partial discharge inspection apparatus includes: an impulse power supply (1) configured to apply an impulse voltage having a voltage rise time period tr which satisfies an expression “tr>(?coil·Vmax)/(PDIV)” to a rotary electric machine (2); a measurement section (12) configured to measure partial discharge which occurs when the impulse voltage is applied to the rotary electric machine (2); and a decision section (15) configured to determine that, when partial discharge is not measured by the measurement section (12), a phase-to-phase insulation performance is acceptable. In the expression, ?coil is a surge propagation time period of one coil of a rotary electric machine winding, PDIV a partial discharge inception voltage between winding turns, and Vmax a peak of a partial discharge testing voltage for the phase-to-phase insulation.

Abstract: A rotating machine includes a stator including a stator core having a plurality of slots arrayed in the circumferential direction, a plurality of conductors for stator winding wire inserted respectively into the slots, and slot liners comprising a sheet-shaped insulator surrounding the conductors for stator winding wire; and a rotor rotatably arranged concentrically with the stator. In the rotating machine the slots of which are filled with an electrically insulative resin, concavo-convex is formed on both the top and bottom surfaces of the slot liners.

Abstract: A delta sigma modulator includes a filter circuit including an integrator having an operational amplifier; a first addition circuit provided between an output section of the filter circuit and an input section of a quantizer, and including a first resistive element; and a second addition circuit including at least one of a first feedforward circuit including a second resistive element or a first feedback circuit configured to feed back, as an analog signal, a digital output signal having been quantized by the quantizer, to an input section of the quantizer, wherein at least one of the first addition circuit or the first feedback circuit includes a phase compensator.

Abstract: A rotating electric machine includes: a stator including a stator core, slots provided in the stator core at equal intervals along the circumferential direction, and coils placed in the stator slots and configured to generate a rotating magnetic field; and a rotor rotatably provided with a predetermined rotation gap between the stator core and the rotor, wherein the rotating electric machine further comprising a first varnish applied between the slots in the stator core and the coils for impregnation, and a second varnish applied directly onto enamel coating of the coils outside of the slots in the axial direction, the first varnish is a thermosetting varnish having a shear bond strength of a flat wire between the coils and the varnish is higher than that of the second varnish, and the second varnish is a thermosetting varnish having a glass transition temperature of approximately 104° C.

Abstract: Insulation inspection method for an inverter-driven rotary electric machine includes: a step of applying, to an insulation sample (2), first impulse voltage simulating a voltage which occurs between winding turns of a rotary electric machine upon application of an inverter surge voltage to measure the number of times Nt-t that an impulse voltage is applied until the insulation sample (2) suffers from insulation breakdown; a step of applying the first impulse voltage to the insulation sample(2) to measure an occurrence frequency npd of partial discharge which occurs per one time application; step of applying a second impulse voltage simulating the inverter surge voltage to a rotary electric machine (3) to measure a partial discharge occurrence frequency npd(motor) between the winding turns which occurs per one time application; and determining that an insulation performance of the rotary electric machine (3) is acceptable.

Abstract: With a rotating electric machine testing method for applying a test voltage to an armature winding of the rotating electric machine to thereby test insulation performance of the armature winding, in the case where a rated voltage of the armature winding of the rotating electric machine is E, and an insulation test voltage of an armature winding of a sine wave voltage drive rotating electric machine at the rated voltage E is E/?{square root over (3)} or E, a test voltage Vtest applied to an armature winding of the inverter drive rotating electric machine is set to Vtest=?·E/?{square root over (3)} or Vtest?=?·E, respectively, provided that ?(=tinv/tsin), if the insulation thicknesses of the sine wave drive rotating electric machine is tsin and of the inverter drive rotating electric machine is tinv, thereby conducting a test on any of the AC voltage-current characteristic, AC tan ?, and AC partial-discharge characteristics.

Abstract: A rotating electrical machine includes: a stator that includes a cylindrical stator core and a stator winding wire wound around the stator core; and a rotor disposed facing the stator via a gap; wherein at least one cooling medium path extending in a direction of a central axis of the stator core is provided in the stator; and the cooling medium path is inclined relative to the central axis of the stator core.

Abstract: The purpose of the invention is to provide an inverter-driven dynamo electric machine and system for the same having high reliability and high efficiency such that even in the case of inverter pulse voltages having high dv/dt, generation of shaft voltages and generation of shaft currents causing electric corrosion of a bearing with the generation of the shaft voltages are suppressed, thereby keeping the bearing free of electric corrosion. The purpose of the invention is achieved by the following method. That is, the purpose is achieved by an inverter-driven dynamo electric machine and system for the same including at least one machine support bearing which supports a shaft of a rotor, and one electric discharge bearing which discharges the voltage generated in the shaft of the rotor, wherein a bearing having a lower dielectric breakdown voltage between an inner ring and an outer ring than that of the machine support bearing is used as the electric discharge bearing.

Abstract: A rotating electric machine for an electric vehicle, installed in a vehicle and driven by an inverter power source, includes: a partial discharge measuring device that measures partial discharges occurring in insulated areas between windings, between phases and between the rotating electric machine and a ground.

Abstract: Two T filters, one of which includes two resistive elements and one capacitive element and the other of which includes two capacitive elements and one resistive element, are inserted in a negative-feedback section of an operational amplifier, and a resistive element and a capacitive element are connected between each of intermediate nodes and a signal input terminal. A resistive element and a capacitive element which are connected to each other in parallel are connected between the signal input terminal and an inverting input terminal of the operational amplifier. With this configuration, overall admittances where elements connected to the corresponding intermediate nodes are in parallel connection are equal to each other.

Abstract: In a rotating electrical machine, a conductive foil or conductive rubber is applied to the surface of insulation layer of a conductor series connection area or to the surface of insulation layer of a turn conductor of coils of rotating electrical machine winding, waveforms of grounding voltages of the individual turn conductor portions are measured through the medium of an electrostatic capacitance of the insulation layer of coil conductor series connection area or through the medium of the insulation layer of coil turn conductor, and a partial discharge is measured while measuring a voltage developing in the coil or across a winding turn in the coil from a difference between the waveforms of grounding voltages.

Abstract: A rotating electric machine includes: a stator in which a stator coil is mounted to a plurality of slots formed on a stator core; and a rotor that is rotatably disposed inside the stator. A slot groove, having a predetermined depth and a predetermined width from an end face of the stator core and forming a space between the stator coil and the stator core, is formed around each of the plurality of slots. The stator coil includes a straight-shaped straight section which is inserted into the slot and is provided with an insulating material, and a coil end section which extends outside of the slot and is bent at a same height as the end face of the stator core.

Abstract: An integrator is provided which can reduce a disturbance in the current waveform of a current DA converter in order to improve the SNR of a ?? modulator, for example. The integrator includes an operational amplifier, and feedback paths provided in parallel between the output terminal and inverting input terminal of the operational amplifier. In one of the feedback paths, an integrating capacitor and at least one resistor are connected in series. In the other feedback path, a second integrating capacitor whose capacitance value is smaller than that of the integrating capacitor is provided.

Abstract: An insulation diagnosis method according to the present invention includes: measurement step through which a signal generated at a diagnosis target device is measured; detection step through which a frequency or a frequency band manifesting a maximum amplitude signal strength is detected from the signal having been measured through the measurement step; and identification step through which an insulation defect type pertaining to an insulation defect having occurred in the diagnosis target device is identified based upon the frequency or the frequency band manifesting the maximum amplitude signal strength having been detected through the detection step.

Abstract: Partial discharge occurring in a continuously operated electric machine is monitored all the time. Even when the electric machine is mounted in mobility equipment, the partial discharge is monitored all the time.

Abstract: A motor comprises a rotor having a permanent magnet, a stator core having a stator coil and a frame for accommodating therein the rotor and the stator core. The stator coil has a shape of a concentrated winding being fitted and wound to a tooth of an one-slot core as one slot per one phase in the stator core and has a molded high thermal conductivity resin for covering the stator coil. Both end faces of the stator coil are respectively provided with insulating and heat-transfer layers which are constituted by a part of the molded high thermal conductivity resin, and each of the electric insulating and heat-transfer layers is put in contact with the frame.

Abstract: A rotating electrical machine includes: a stator that includes a cylindrical stator core and a stator winding wire wound around the stator core; and a rotor disposed facing the stator via a gap; wherein at least one cooling medium path extending in a direction of a central axis of the stator core is provided in the stator; and the cooling medium path is inclined relative to the central axis of the stator core.

Abstract: The power distribution unit for a rotary electric machine includes a connecting ring unit that connects stator coils of the same phase. The connecting ring unit includes at least one linear conductor integrally formed in a ring-like shape, and the connecting ring unit includes a terminal section integrally formed in the linear conductor. The terminal section is constituted by a hole through which a wiring end of the stator coil is inserted and a protrusion formed in a direction of the hole to which the wiring end of the stator coil is connected. Also disclosed are a rotary electric machine includes the power distribution unit and a method for assembling a rotary electric machine.

Abstract: There is provided a receiving device including: a receiving unit that receives a packet stream; an oscillator; a measuring unit that performs a measuring operation; an acquiring unit that reads the newest time stamp read from the packet stream received by the receiving unit and the newest measurement value measured by the measuring unit with a predetermined period, from a point of time when the packet stream starts to be received; a calculating unit that calculates an accumulation value of the time stamps and the measurement values acquired by the acquiring unit; a comparing unit that compares a difference between the accumulation value of the time stamps and the accumulation value of the measurement values calculated by the calculating unit, and a value corresponding to a network jitter; and a frequency control unit that controls the oscillation frequency of the oscillator based on the comparison result by the comparing unit.

Abstract: The stator includes a plurality of concentrated winding coils disposed coupled into an annular form through yokes, and a plurality of conductors that couple the coil ends of the concentrated winding coils to each other in a multi-phase connection fashion. Conductors for a U-phase, a V-phase, a W-phase, and neutral points P are each formed of a plurality of holes for inserting therethrough coil ends and are substantially circular with different diameters, and are disposed on the same plane. A connection plate provided with a wall is inserted between the conductors and the concentrated winding coils. A rotating machine includes the above-mentioned stator and a rotor that is rotatable within the stator.

Abstract: The axial piston pump is provided with two annular seals mounted in the housing and sealingly engaging the piston to define a sealing fluid zone therebetween. An annular ring is provided between the seals to control the flow of sealing fluid through the fluid zone. This ring includes an internal helical flush duct for guiding the sealing fluid helically about the piston from one end of the ring to the other end of the ring.