Aisin Aw Co., Ltd.

Toyota Jidosha Kabushiki Kaisha

Aisin Corporation

Denso Corporation

Hideaki Kimura

Tooru Kuroyanagi

Satoshi Koide

Takamitsu Sugimoto

Tsuyoshi Niwa

Shingo Hashimoto

Kiyotaka Koga

Susumu Kato

Hiroaki Urano

Junichi Yokota

Shigeru Maeda

Takeshi Yokoyama

Hideaki Miyake

Yuki Kosaka

Yoshiyuki Kawasaki

Yoichi Miyoshi

Keishi Matsumoto

Junichi Sugawara

Masahiko Sakao

Nobuyuki Asaoka

Hideyuki Satou

In an insulation inspection method for detecting creeping discharge that occurs in a coil in an armature, a predetermined impulse voltage is applied to the coil, and an electrical current value of a current that flows to a current detector that is connected to the coil is detected. The detected electrical current value is analyzed to acquire a relationship between a frequency and an electrical current value spectrum in the detected electrical current value. Based on the acquired relationship, a total sum of electrical current value spectrum areas in a high-frequency band is calculated as a high-frequency spectrum area. The high-frequency band differs from a predetermined low-frequency band in which partial discharge that occurs in a portion of a thin coating of the wire configuring the coil can be detected. Based on a magnitude of the calculated high-frequency spectrum area, creeping discharge that occurs in the coil is detected.

Insulation inspection method and insulation inspection apparatus

A method for manufacturing an armature () includes: a coil disposing step involving using a thermally expandable resin (Q) that expands by application of heat, and disposing a coil () in a core () such that the thermally expandable resin (Q) before expansion is disposed between a slot-housed portion () and an inner surface of a slot (); a resin disposing step involving, before or after the coil disposing step, using a thermally melting resin (P) that melts by application of heat, and disposing the thermally melting resin (P) before melting such that the thermally melting resin (P) comes into contact with coil end portions (); and a heating step involving, after the coil disposing step and the resin disposing step, heating, expanding, and then curing the thermally expandable resin (Q), and heating, melting, and then curing the thermally melting resin (P).

Armature manufacturing method and armature

Provided is a diagnostic device for a coil including a voltage application unit applying an impulse voltage to the coil; a response voltage detection unit detecting a response voltage from the coil with respect to the impulse voltage; an index calculation unit calculating a determination index indicating an electrical feature of the coil based on the response voltage; and a determination unit determining whether there is an abnormality in a target coil to be diagnosed by comparing the determination index of a reference coil that is the coil that is normal and the determination index of the target coil. At least one of a zero cross point at which the response voltage intersects with a reference voltage and a peak voltage on a positive side and a negative side of the response voltage is used as the determination index, in addition to a circuit constant of the coil.

Diagnostic device for coil and diagnosis method for coil

A stator for a rotating electrical machine, the stator including a tubular core having a plurality of slots; and a coil mounted in the core, wherein the coil includes a plurality of conductor wires aligned in the slots, each of the conductor wires has ends projecting beyond the slot, a pair of the ends are bonded together to form a bonded end, a plurality of the bonded ends are arranged next to each other in a circumferential direction of the core and are arranged in a radial pattern so as to extend in a radial direction of the core, and a cap is formed by molding using a resin material having electrical insulation properties so that the cap integrally covers adjacent ones of the plurality of bonded ends.

Stator for rotating electrical machine

A stator heating apparatus that includes a support that supports a stator in which a stator coil is mounted to a stator core and that is driven by a rotary to rotate the stator; a first heater that includes an induction coil inserted into a cavity portion provided at an axial center of the stator core of the stator supported by the support to be disposed to heat the stator through induction heating, the first heater heating the stator from a radially inner side of the stator; and a second heater that includes a hot-air outlet port that blows hot air toward an outer surface of a coil end portion of the stator supported by the support to heat the stator using the hot air, the second heater heating the stator from a side of the outer surface of the coil end portion, wherein the stator is heated by the first heater and the second heater.

Stator heating apparatus and stator heating method

A varnish impregnation apparatus that includes a support that supports a stator, in which the stator coil is mounted to the stator core, with an axial direction of the stator directed in a horizontal direction while grasping a radially outer side of the stator, and that is rotationally driven by a rotary device to rotate the stator; a varnish dropping device that drops the varnish toward a coil end portion of the stator which is rotated while being supported by the support; and a heater disposed in a cavity portion provided at an axial center of the stator core of the stator supported by the support to heat the stator from a radially inner side of the stator.

Varnish impregnation apparatus and varnish impregnation method

A stator coil heating apparatus and a stator coil heating method that are capable of effectively preventing a core from thermal deformation particularly caused due to a magnetic flux generated by a coil head, without the problem of heating temperature variation, and also shortening a time for the process of heating a stator coil, are provided. A stator coil heating apparatus A to heat a stator coil L wound around a circular core F, comprises: induction heating coil headsandthat heat the circular coil L by generating an inductive effect acting from outside in the thickness direction of the core F, against circular winding coil bases La and Lb that are sticking out of end faces Fa and Fb of the core F in the thickness direction thereof; and shieldsandthat block a magnetic flux generated by the coil headsand, out of the end faces Fa and Fb of the core F in the thickness direction thereof.

Stator coil heating apparatus and stator coil heating method

A stator manufacturing method which manufactures an insulated conductor coil and mounts this coil to the core, the insulated conductor coil being formed by deforming an insulated conductor into a shape having rectilinear in-slot conductor sections and coil end sections having bent sections, the conductor having an enamel layer formed on the outer periphery thereof and also having an extruded resin coating layer formed on the outer periphery of the enamel layer, comprises: a first step of forming the conductor coil by deforming the conductor to form the bent sections while the coating layer of the conductor is in a non-crystalline resin state; a second step of heating the extruded resin coating layer of the conductor coil to change into a crystalline resin state to a temperature higher than or equal to the glass transition temperature; and a third step of mounting the conductor coil to the core.

Stator manufacturing method and stator

In a method of heating a stator, a first induction coil is disposed near one of the coil ends of the stator, and a second induction coil is disposed near the other, and the first induction coil and the second induction coil are electrically energized, whereby the induction-heating of the stator is performed as a pre-heating step prior to the resin molding step of the coil ends. According to this method, a first movement unit for moving the first induction coil and a second movement unit for moving the second induction coil are provided, the first induction coil is moved by the first movement unit and the second induction coil is moved by the second movement unit for induction-heating of the stator.

Process of measuring the temperature of coil end part and the stator core

A rotary electric machine-manufacturing apparatus utilized to implement a process of infiltrating varnish into wire-wound coils of a rotary electric machine, and of curing the varnish, an apparatus includes a rotatorsupporting a work S attached with the wire-wound coils Sc and rotating the work; and a high-frequency power supply device supplying electric power to the wire-wound coils. It is thus possible to support and heat up the work without having devices that surround the work S, thereby positioning a varnish dropping-infiltrating deviceappropriately. Further, there is no need to change a stage as conventional heat-up processes with an oven or a hot blast-circulating furnace did, and an entire process from pre-drying to curing can be implemented at a single stage.

Rotary electric machine-manufacturing apparatus and method of manufacturing the same

In an insulation coated conductor inspection method for inspecting an electrical insulation characteristic of an insulation coated conductor in a coil formed by winding the insulation coated conductor, the coil is disposed in a test container, an internal pressure of the test container is reduced, an electrodes are provided so as to face the coil with a gap therebetween, an alternating-current voltage is applied between the electrodes and the coil, a generation frequency of a discharge that is generated between the coil and the electrodes upon application of the alternating-current voltage is measured, and the coil is determined to be a non-defective product having a superior electrical insulation property when the generation frequency of the discharge is higher than a reference generation frequency and determined to be a defective product having a defective electrical insulation property when the generation frequency of the discharge is lower than the reference generation frequency. A predetermined range is preferably set as a range in which a discharge charge amount is no greater than 100,000 (pc).

Insulation coated conductor inspection method and inspection apparatus

A varnish impregnation state determination method for determining a varnish impregnation state of a core assembly that is formed by disposing a coil inside a slot of a motor core and impregnating the coil and an interior of the slot with a varnish, including applying an alternating current voltage between the motor core and the coil to determine tan &#x3b4; that serves as a dielectric dissipation factor; and determining that the varnish impregnation state of the core assembly is normal when a value of the tan &#x3b4; is equal to or smaller than a predetermined non-defective article reference value.

Method for judging a status of varnish impregnation

An insulating paper piece for electric motors, capable of improving both electrical insulation between a coil and a stator core and electrical insulation between ends of coils of different phases without adversely affecting ease of coil insertion or the space taken up for the coil. A single insulating paper piece for electric motors contains at least two slot cell portions arranged in two slots of the stator core in which portions of one single pole coil are to be inserted, with two phase insulation portions arranged to connect respective ends of the two slot cell portions to form loops and disposed to face directly against coil ends of the single pole coil. The phase insulation portions comprise overlapping widthwise portions extended from both ends so that when a plurality of the insulating paper pieces for electric motors are mounted on the stator core, the respective overlapping portions of the adjacent insulating paper pieces overlap one another.

Growing community of inventors

Okazaki, Japan

Hideaki Kimura