Minebea Company, Limited

Minebea Kabushiki-kaisha (minebea Co., Ltd.)

Minebea Kabushiki-kaisha

Minebera Co., Ltd.

Mineba Ceo., Ltd.

Sakae Fujitani

Yuzuru Suzuki

Naoyuki Harada

Kunitake Matsushita

Masaki Kagawa

Kenichi Makino

Yoshiyuki Aono

Taketoshi Ohyashiki

Seiichi Matsuura

Haruyoshi Hino

Masaaki Inagaki

Takashi Ishii

Kazuo Muramatsu

Hideki Sakiyama

Hiroshi Sano

Takayuki Yamawaki

Masato Hata

Taichi Nishio

Masahisa Ezuka

Hitoshi Takahashi

Hitoshi Uchida

Naomi Inoue

Nobuyuki Sueyoshi

Hiroki Akaoka

Hiroichi Shibata

Hirohito Nakamata

Hiroto Nakamata

Masanao Okuda

Junichiro Fukazawa

Masahisa Etsuka

A drive controller of an instrument controls a stepping motor to rotate a pointer of the instrument attached to a rotation shaft of the stepping motor, the pointer rotatable between a zero scale position and a maximum scale position. The drive controller controls the stepping motor to perform a sweeping operation in which the pointer is swung from the zero scale position to the maximum scale position and returned back to the zero scale position, wherein the drive controller controls the stepping motor, during the sweeping operation, to accelerate to a predetermined speed by outputting a rated torque signal to the stepping motor and controls the stepping motor to rotate at the predetermined speed by outputting a decreased torque signal to the stepping motor, the decreased torque signal being lower than the rated torque signal.

Drive controller of instrument

An electromagnetic actuator with high performance such as high speed and high resolution is inexpensively provided with solutions to problems associated with power supply and leakage flux, which have been involved in the structure of a moving coil type and have been shortcomings of a VCM type actuator. A composite electromagnetic actuator apparatus employs the foregoing electromagnetic actuator. The electromagnetic actuator is equipped with a stationary assembly that includes two coils disposed coaxially with each other inside a hollow stator yoke composed of a soft magnetic material, and a movable assembly composed of a movable magnet unit and a movable yoke unit both disposed inside the coils with a very small clearance therefrom so as to be movable in the axial direction, wherein the movable assembly travels in the axial direction by the interaction between a magnetic field generated by the movable magnet unit and a current passing through the coils.

Electromagnetic actuator and composite electromagnetic actuator apparatus

The disclosure describes a DC motor including a rotor unit arranged within the motor body and has a cylindrical field magnet fixed to an outer surface of a holder. The holder has a rotating shaft press-fitted through the center, and the cylindrical field magnet has the S and the N poles alternately around a circumference. There is a stator unit which is circumferentially arranged around the rotor unit, that is made of a plurality of stator yokes that are arranged so that they oppose the field magnet through a small gap. Each of the stator yokes is formed by circumferentially stacking a large number of thin plates, each consisting of a salient pole, and a number of coil units, each formed by winding a magnet wire on a bobbin, and mounting the bobbins on the stator yokes. In the described arrangement, each of the S and N poles has a plurality of stages formed in an axial direction and shifted from each other in the circumferential direction by a predetermined shift amount with respect to the field magnet.

DC motor

In order to reduce cost through reduction in material cost and improvement of productivity, in a linear type actuator comprising: a stator unit having coils consisting of wound magnet wires and housed inside stator sub-assemblies and pole teeth arranged on the inner circumference thereof; a rotor unit having a field magnet arranged on the outer circumference thereof and rotatably disposed so as to oppose the pole teeth with a given gap; an output shaft attached to a center portion of the rotor unit and movable in the axial direction thereof; and converting means provided on the innermost diametral circumferential surface of the rotor unit and adapted to convert rotary motion of the rotor unit into linear motion of the output shaft, the converting means is made of a material different from that of the rotor unit.

Linear type actuator

An electric rotary machine includes a stator comprising: a stator ring; a plurality of discrete salient poles each comprising a bobbin with guide grooves and a pole tooth with a groove, disposed inside the stator ring, and fixed by a molding resin injected inside the stator ring; and a positioning ring having protrusions at its outer circumference and engaging with the discrete salient poles such that the protrusions are each fitted into the groove of the pole tooth.

Electric rotary machine having positioning ring for securing salient poles in place

An electric rotary machine comprises: a cylindrical pole tooth ring provided with a plurality of slits; and a plurality of salient poles each including a pole tooth. The salient poles are each positioned and fixed such that the pole tooth is fitted into the slit, which, by means of openings formed on the pole tooth ring along and close to the side wall of the slit, is adapted to be elastically deformed when receiving the pole tooth fitted thereinto.

Electric rotary machine with armature of discrete salient pole structure

The stator assembly of a PM stepping motor having a two-phase structure in which two stators arranged along the circumferential direction in such a manner that respective pole teeth are intermeshed together are combined back to back so as to phase-shift the respective pole teeth in the two stators at an electrical angle of 90&deg;. The field rotor magnet is so arranged as to face the respective pole teeth at a small distance, and is magnetized on its circumferential surface along the circumferential direction with a plurality of alternating N- and S-poles having a preset width not matching the pole tooth pitch of each stator.

Permanent magnet stepping motor having pole teeth misaligned by an electrical angle

The present invention provides a rotor magnet with a claw pole type of actuator of a single phase structure and a magnetization method of the rotor magnet, in which detent and dynamic torques are sufficiently ensured, an angle range of rotational operation is wide, the cost is inexpensive and the characteristics are stable. In the actuator of such structure, the rotor magnet is rotatably arranged through a fine space inside an armature coil, wherein the rotor magnet comprises a single cylindrical type of magnet having a distribution pattern of a magnetic flux in which the magnetic pole peak position of at least one of the N and S poles is shifted stepwise in the axial direction thereof.

Actuator

An inexpensive, small, high-efficiency actuator having a single-phase claw pole structure permits easy assembly or winding and enables a rotor to act in a fixed direction by detent torque even in a deenergization mode. The actuator includes a stator yoke composed of a pair of substantially circular toroidal planar yokes formed of a soft magnetic material, polar teeth which axially protrude from inner peripheral edges of the respective planar yokes and which are disposed so that they face each other, extending in a circumferential direction, and a stator yoke that has a cylindrical ring provided on outer peripheral edges of the planar yokes; an armature being constituted by installing a coil formed by winding a magnet wire in a coil receiving section shaped like an annular recess formed by the planar yokes, the polar teeth, and the cylindrical ring of the stator yoke; and a stator assembly which has flanges with bearings provided on both end surfaces of the armature and in which a rotor provided with a magnet for a magnetic field composed of a permanent magnet being installed such that it faces the polar teeth of the stator with minute gaps provided therebetween; wherein the number of the polar tooth equals the number N of rotor magnetic poles (N is 2 or 4).

Actuator with number of stator teeth equal to number of rotor poles

An electric rotary machine comprises a cylindrical pole tooth ring and a plurality of salient poles each including a pole tooth. The salient poles are each positioned and fixed such the pole tooth makes firm contact with the pole tooth ring by means of each of a plurality of mechanisms, which are arrayed circumferentially on the pole tooth ring, and which each comprise bend-ups adapted to be elastically deformed when the pole tooth is fitted into the mechanism.

A terminal of a motor is provided, in which a connection between a coil and an external circuit can be carried out securely and with a good workability, while saving material resources and enhancing safety relating to environmental pollution. A terminal ( ) consists integrally of a magnet wire binding section ( ) to connect to a magnet wire ( ) of a coil ( ), an external connection section ( ) to connect to an external circuit and a support base section ( ) to press-fit into a terminal block ( ) of a bobbin ( ) and hold the terminal ( ), and the magnet wire ( ) is plasma welded for connection through to the external connection section ( ) (terminal ). The connection of the terminal is carried out by welding (plasma welding), thus the end of the magnet wire of a motor ( ) is connected without using solder containing lead. As a result, since lead is not used, material resources can be saved and safety relating to the environmental pollution can be enhanced. Since the support base section ( ) press-fits into a hole of the terminal block ( ) of the bobbin ( ), a direction and position of the terminal ( ) are settled to thereby increase the stability.

Terminal structure of a motor

Electromagnetic conversion efficiency of an electric rotary machine is enhanced and reduction of leakage flux due to magnetic discontinuity can be realized without providing holes for positioning and fixing salient poles in a stator ring. Outer appearance and decency of the electric rotary machine as a product are also improved by not allowing lower ends of salient poles of an armature assembly to be exposed on an outer surface of the electric rotary machine. For this purpose a radial gap type electric rotary machine comprises a field magnetic pole consisting of a permanent magnet which is supported rotatably and an armature assembly consisting of a plurality of divided salient poles which oppose the field magnetic pole with a small air gap therebetween and are radially arranged with respect to a rotation axis. The armature assembly includes a first ring made of a soft magnetic member for receiving the plurality of salient poles and a second ring made of a soft magnet member for receiving the first ring.

Electric rotary machine

The present invention provides, at low cost, a stator structure of a high-performance motor, which gives off lower temperature rise, strives for a more highly efficient magnetic circuit, and achieves lower power consumption at highspeed rotation, while at the same time striving to achieve a stable rotor position by preventing rotor float at highspeed rotation. In a highspeed motor comprising a stator including a stator yoke made of a soft magnetic material and coils composed of magnet wires wound on salient poles of the stator yoke; A rotor including a field magnet includes a permanent magnet so as to face the salient poles of the stator by way of an air gap and a shaft as the center of rotation in the center thereof; and a base plate having a housing which has two bearings for rotatably holding the rotor in the center of the stator, improvement being that the stator yoke is constituted by winding a soft magnetic steel sheet.

Stator structure of highspeed motor

The present invention provides, in a single phase-structure actuator, a rotor magnet structure having characteristics wherein detent torque is fully assured, and there is also a large rotation angle range. In a single phase-structure claw pole-type actuator,which constitutes an armature,constituted from stator yokes,which constitute a pair of donut-shaped flat yokes,comprising a Soft-Magnetic material, and pole tooth,which protrude in the axial direction from the inner rim of these flat yokes, and extend in the circumferential direction, and a cylindrical ring,which extends in the same direction as the pole tooth,on the outer rim of a yoke, and from a coil,which is formed by winding an insulating wire, and which is provided in a toroidal concave coil holder portion, which is formed from the flat yokes, pole tooth, and cylindrical ring of the stator yoke, and, in a stator assembly, having bearings,equipped flanges,at both end faces of this stator, causes a rotor,which is equipped with a field magnet comprising a permanent magnet rotor (hereinafter referred to as &ldquo;rotor magnet&rdquo; to face the pole tooth of this stator by way of a minute gap, the rotor magnet,is a cylindrical shape, and a plurality of magnets are connected in the axial direction, and the magnetic poles of each magnet are mutually shifted in the circumferential direction.

Growing community of inventors

Shizuoka-ken, Japan

Sakae Fujitani