Thk Co., Ltd.

Tdk Corporation

Akihiro Unno

Yuki Hayashi

Yuki Tanaka

Yusuke Asano

Tomofumi Ohashi

Katsunori Kogure

Toshiyuki Aso

Kei Tanabe

Yuki Nomura

Toshiro Tojo

Saiki Shigemori

Masashi Takahashi

Atsushi Matsuda

Kenichi Tochi

Takashi Aoyagi

Hiroshi Kaneshige

Kazuo Shoda

Ayako Miyajima

Tomoyuki Aida

Yoshinobu Takayanagi

Kazuto Homma

Hirofumi Suzuki

Taro Miyamoto

Kazuhiro Tani

Hirofumi Natori

Yuki Asazuma

Disclosed herein is a switching power supply circuit that includes a switching circuit having an input node connected to an input power supply terminal and an output node connected to an output power supply terminal through an output switch, a feedback circuit configured to feed back information based on a voltage appearing at the output node to the switching circuit, and an activation circuit configured to turn ON the output switch after an elapse of a predetermined time after a voltage appearing at the output node exceeds a predetermined value. The switching circuit is configured to adjust a level of a voltage appearing at the output node based on the information to a predetermined level. The feedback circuit includes an adjustment mechanism configured to adjust a relation between a voltage appearing at the output node and the information.

Switching power supply circuit and switching power supply system having the same

An electromagnetic induction power generator includes a magnetic core attachable to a power transmission/distribution line, a power generating coil wound around the magnetic core, and a switching power supply circuit that converts AC appearing at both ends of the power generating coil into DC. The switching power supply circuit stops its switching operation based on a DC voltage level. The stop of the switching operation increases reactive power, allowing a stable power generating operation, i.e., a stable supply of active power irrespective of the amount of current flowing through the power transmission/distribution line. In addition, the amount of the reactive power can be finely adjusted based on the length of a period during which the switching operation is stopped, allowing a finer control of the reactive power.

Electromagnetic induction power generator

A lifespan diagnosis device for a motion guidance device including: a stress calculating means which calculates stresses during movement for each of virtual segments, the stresses during movement being stresses that occur in each segment during a movement of the moving member; a counting means which counts, for each of the segments, on the basis of the amount of displacement, the number of occurrences of the stresses during movement which repetitively occur with waving during a movement of the moving member along the track; and a diagnostic means which calculates, for each of the segments, a lifespan exhaustion ratio on the basis of magnitudes of the stresses during movement and the number of occurrences of the stresses during movement, and which diagnoses the lifespan of the motion guidance device on the basis of the calculated lifespan exhaustion ratios of the respective segments.

Lifespan diagnosis device, method, non-transitory storage medium, and system for motion guidance device

A machining control system for machining of a workpiece movably supported by a motion guidance device having a track member which extends along a longitudinal direction and a moving member which is arranged so as to oppose the track member via a rolling element being rollably arranged inside a rolling groove and which is relatively movable along the longitudinal direction of the track member, the machining control system including: an acquisition unit which acquires prescribed machining information related to a load applied to the motion guidance device when machining of the workpiece is performed by the machining device; and an output unit which generates machining correction information for correcting a prescribed control parameter for machining of the workpiece by the machining device on the basis of the prescribed machining information acquired by the acquisition unit and which outputs the generated machining correction information to a side of the machining device.

Machining control system and motion guidance device

A magnetic sensor suppressing bias magnetic field effects includes a magnetic detecting unit including first to fourth magneto-resistive elements to which a first magnetic field to be detected is applied, a differential amplifier into which the output voltage of the magnetic detecting unit is input, a first magnetic field generating conductor which, by a first feedback current output by the differential amplifier, applies to the magnetic detecting unit a second magnetic field to cancel the first magnetic field detected by the magnetic detecting unit, a bias magnetic field detector which detects a bias magnetic field applied to the magnetic detecting unit and outputs a second feedback current corresponding to the bias magnetic field, and a second magnetic field generating conductor which, by the second negative feedback current, applies to the magnetic detecting unit a correcting magnetic field to cancel the bias magnetic field detected by the magnetic detecting unit.

Magnetic sensor

An object of the present invention is to provide a magnetic sensor that can reduce influences of a disturbance magnetic field while ensuring high detection sensitivity. The magnetic sensor includes a sensor chiphaving an element formation surfaceS on which magnetic detection elements MR, MRare formed, a first magnetic memberplaced on the element formation surfaceS and having a first height Has a height from the element formation surfaceS, and a second magnetic memberlocated on an opposite side of the magnetic detection elements MR, MRto the first magnetic memberand having a second height Hlower than the first height H. According to the present invention, because the height Hof the second magnetic memberis lower than that of the first magnetic member, a detection magnetic field attracted to the second magnetic membercan be reduced while a disturbance magnetic field is shielded by the second magnetic member. Accordingly, influences of the disturbance magnetic field can be reduced while high detection sensitivity is ensured.

Magnetic sensor and magnetic-field detection device including the same

A coil unit connection structure is provided which can integrate locations connected to a power cable into one side in an arrangement direction of a plurality of coil units. In a coil unit connection structure that electrically connects a plurality of coil units, each of the coil units includes a coil and a return wire. A plurality of the coils of the plurality of coil units is electrically connected to each other. A plurality of the return wires of the plurality of coil units is electrically connected to each other. A terminal unit is provided which includes a connecting wire that electrically connects the coil and the return wire of the coil unit at the terminal end.

Coil unit connection structure

To suitably set a control gain in feedback control while suppressing an increase in apparatus size. A workpiece transport control system includes: one or a plurality of motion guidance devices; a table on which a workpiece is to be placed; an actuator which imparts a driving force to the table; a control unit which performs transport control by feedback control; and a calculation unit which calculates a transport load applied from the workpiece to a moving member of each of the one or a plurality of motion guidance devices, wherein a control gain related to the feedback control in the transport control is adjusted on the basis of the transport load in each of the one or a plurality of motion guidance devices.

Workpiece transport control system and motion guidance device

In a management system which manages user equipment installed in a prescribed space managed by a user, the user equipment including a plurality of motion guidance devices each including a track member, a moving member, and a plurality of displacement sensors which detect displacements of the moving member in a prescribed number of displacement directions in the moving member, on the basis of lifespan-related information corresponding to each of the plurality of motion guidance devices, a lifespan exhaustion ratio of each motion guidance device is calculated and, on the basis of the calculated lifespan exhaustion ratio, replacement object devices to be replaced within a prescribed period which constitute a part of or all of the plurality of motion guidance devices are determined. In addition, a user is notified of a replacement timing at which all of the determined replacement object devices in the user equipment are to be replaced.

Management system and motion guidance device

In a piezoelectric element, a piezoelectric film, a first electrode film provided on one surface of the piezoelectric film, and a second electrode film provided on the other surface of the piezoelectric film form a layered structure, an outer contour of the first electrode film and an outer contour of the second electrode film are positioned outside an outer contour of the piezoelectric film as viewed in a layering direction, an organic resin film is in contact with the piezoelectric film, and generation of noise is suppressed.

Angular velocity sensor

A rotary moto actuator with a base, a table, a statorand a rotorof a rotary motorand a first memberand a second memberof a guide mechanismthat have a plurality of base segments, a plurality of table segments, a plurality of stator segments, a plurality of rotor segments, a plurality of first member segmentsand a plurality of second member segments, respectively, which all arranged circumferentially around a center line C. The stator segmentsare connected to the base segments, to which the first member segmentsare connected. The rotor segmentsare connected to the table segments, to which the second member segmentsare connected.

Rotary motor actuator and horizontal axis wind turbine

A drive guide device capable of effectively releasing heat produced by a mover. The drive guide device has a movement unitmoved by a linear motor while being guided by a rail. The movement unithas the moverto which electricity is conducted to produce a magnetic field, a tableplaced on the moveron the opposite side of a baseto which the railis fixed, a heat sinkhaving heat radiation fins for releasing heat produced by the moverand placed between the moverand the table, and a heat transmission route for transmitting heat, which cannot be released by the heat sink, to the table. The tableis made from a material having a low thermal expansion coefficient.

Drive guide apparatus

A distributed-arrangement linear motor in which stators are arranged in a distributed manner and a method of controlling the distributed-arrangement linear motor are provided. The linear motoris a linear motor in which a stator and a movable member are relatively movable, wherein the stator and the movable member respectively have periodic structures in which plural kinds of poles of the stator and the movable member () () which magnetically act each other and arranged periodically subsequently in an order according to the arrangement in a direction of the relative motion therebetween; a plurality of stators are arranged in a distributed manner in the direction of the relative motion; a distance D, Dbetween adjacent stators is not more than a length Lmv of the movable member; the pole of the stator is formed of a coil; and a current control unit that controls current to be supplied to the coil based on the distance between the stators is provided.

Distributed-arrangement linear motor and control method of distributed-arrangement linear motor

A linear motor is provided with a stator, a slider disposed to be movable relatively with respect to the stator with a gap, and a non-magnetic plate mounted to either one of the stator and the slider so as to define the gap between the stator and the slider.

Linear motor having a slidable element

Provided is a linear actuator unit that includes: a guide shaft formed of a magnetic body that is formed into a tubular shape while having a hollow portion therein, and has one linear opening portion formed thereon along an axial direction thereof; a slide member capable of reciprocating motion freely along the guide shaft; a magnet rod supported at both ends thereof in the hollow portion of the guide shaft; a forcer arranged on a periphery of the magnet rod in the hollow portion of the guide shaft, constitutes a linear motor together with the magnet rod, and is joined to the slide member while interposing the opening portion of the guide shaft therebetween; and a rod correction plate that is formed of a magnetic body, and juts out from the slide member forward and backward in a movement direction thereof so as to close the opening portion of the guide shaft.

Growing community of inventors

Tokyo, Japan

Akihiro Unno