Kabushiki Kaisha Yaskawa Denki

Motomichi Ohto

Takeo Suzuki

Yuji Arinaga

Toru Shikayama

Masanobu Kakihara

Shogo Makino

Haruki Yahara

Yukio Tsutsui

Yosuke Shirozu

Kenichi Hirata

Yasuhiro Miyamoto

Jiro Muraoka

Hideaki Ike

Masahiko Tanabe

Takefumi Kabashima

Ryuichiro Tominaga

Shinichi Nishi

Kazutoshi Imai

Sadayuki Sato

Mitsunori Kamo

Hiroshi Koga

Atsushi Kawahara

Masahiro Touchi

Hiroki Takamura

Sohji Murakami

Yuta Matsunami

Misaki Shiiya

Souji Murakami

Hirotoshi Hayakawa

Hirofumi Inokuchi

A motor control system includes a motor and a motor control circuitry. The motor includes a rotation axis and a bearing rotatably supporting the rotation axis. The motor control circuitry is configured to control the motor. The motor control circuitry includes a driving time adding circuit configured to add up a driving time of the motor to obtain an accumulated driving time of the motor, a remaining lifetime calculation circuit configured to calculate a remaining lifetime of the bearing based on a lifetime of the bearing and the accumulated driving time, and a warning outputting circuit configured to output warning information when the remaining lifetime is equal to or less than a threshold.

Motor control system, motor control apparatus, and bearing lifetime diagnosis method

A rotating electrical machine includes a frame, and a stator core fixed to an inner peripheral surface of the frame and including a plurality of split cores disposed in a peripheral direction. Each of the plurality of split cores includes a groove disposed along an axial direction on a central position in the peripheral direction on an outer peripheral surface of the split core, and a first protrusion disposed on a bottom of the groove and protruding outward in a radial direction.

Rotating electrical machine and producing method of rotating electrical machine

A rotating electrical machine includes a plurality of core pieces forming a stator core. Each of the core pieces includes contact surfaces on one side end and another side end in a peripheral direction, a tapered protrusion on the contact surface of the one side end, the protrusion including first inclined surfaces outside and inside, and a recess on the contact surface of the other side end, the recess including second inclined surfaces contacting the first inclined surfaces outside and inside to receive the protrusion of adjacent core piece. A cross-sectional shape of the protrusion is a shape such that, inside a circle centered on a first end portion with a distance being a radius between a second end portion located on an opposite side of the first end portion and the first end portion, at least a part of the first inclined surfaces contact the second inclined surfaces.

A rotary electric machine is provided, which includes a rotor core, a plurality of permanent magnets embedded in the rotor core, and a stator core arranged so as to oppose to the rotor core. The plurality of permanent magnets include a pair of first permanent magnets. The pair of first permanent magnets are arranged so that first magnetic poles thereof having the same polarity oppose to each other and are separated from each other on both sides of a magnetic path of d-axis by a predetermined distance. The rotor core includes gaps formed within the magnetic path of the d-axis.

Rotary electric machine and rotor

A linear motor includes a stator and an armature that faces the stator with a gap therebetween. The stator has an elongated shape extending so as to cross a direction in which the stator faces the armature, and includes a plurality of salient poles that are arranged along a longitudinal direction of the stator and protrude toward the armature. The armature includes an armature core including a tooth that protrudes toward the stator, an armature winding wound around the tooth, a plurality of permanent magnets disposed on an end side of the tooth so as to be arranged along the longitudinal direction of the stator, and a magnetic-field sensor that detects a magnetic field which is generated by the plurality of permanent magnets and which passes through the plurality of salient poles.

Linear motor

A rotating electrical machine includes a rotor core, a stator core, and at least one permanent magnet. The rotor core has an inner circumference portion and an outer circumference portion. The stator core is opposed to the outer circumference portion of the rotor core. The at least one permanent magnet radially extends inside the rotor core. The at least one permanent magnet has an incremental circumferential width in a direction from the inner circumference portion to the outer circumference portion of the rotor core.

Rotating electrical machine

An actuator in accordance with an embodiment includes at least one linear motor, a partition member and a fan. The linear motor is configured to linearly move a shaft serving as a movable member. The partition member is provided close to the shaft and configured to partition a space defined between the shaft and a control board for controlling the linear motor. Further, the fan is arranged on the side of the shaft with respect to the partition member and configured to flow an air existing in a partitioned space on the side of the shaft.

Actuator and actuator cooling method

A linear motor includes a field including main-magnetic-pole permanent magnets magnetized in a direction of a generation magnetic field, and sub-magnetic-pole permanent magnets magnetized in a direction different from the direction of magnetic poles of the main-magnetic-pole permanent magnets, portions of the main-magnetic-pole permanent magnets located at a magnetic-field generation side being replaced with soft magnetic materials; and an armature including an armature core having teeth and armature coils wound around the armature cores. The linear motor satisfies &#x3bb;&#x3c;&#x3c4;, where &#x3bb; is a pitch of the magnetic poles of the field, and &#x3c4; is a pitch of the teeth.

This invention provides a rotating electrical machine including a rotor that has an even number of first permanent magnets aligned in a circumferential direction of the rotor, second permanent magnets of a number equal to that of the first permanent magnets, provided respectively between the stator and circumferential ends of the first permanent magnets adjacent to each other in the circumferential direction, and core pieces of a number equal to that of the first permanent magnets, provided respectively between the second permanent magnets adjacent to each other in the circumferential direction.

A linear motor armature includes a plurality of armature core blocks that are linearly connected to each other, each armature core block being formed of a stack of a plurality of armature cores that are substantially I-shaped, each armature core block including teeth portions around which armature coils are wound, the teeth portions being provided in two end portions of the armature core block in a longitudinal direction of the armature core block, and a step portion extending in a direction perpendicular to the longitudinal direction of the armature core block, the step portion being provided at a center of the armature core block and having a width larger than a width of the teeth portions, wherein an attachment hole for fixing each of the plurality of armature core blocks to an external armature attachment plate is formed in each of two side portions of the step portion.

Linear motor armature and linear motor

Provided is a magnetic encoder device capable of detecting a rotating angle of an actuator having a cavity structure. The magnetic encoder device includes a ring-shaped rotating body, a ring-shaped permanent magnetwhich is inscribed in and fixed to an inner circumferential side of the ring-shaped rotating bodyand magnetized in a direction perpendicular to a center axis of the rotating body, and a fixed bodywhich is disposed on an inner circumferential side of the permanent magnetthrough an air gap and has a circular circumference and a cavity, and a magnetic field detecting elementdisposed on an outer circumferential side of the fixed bodythrough the permanent magnetand the air gap.

Magnetic encoder device and actuator

A permanent magnet synchronous linear motor comprising a field yoke ( ) having a plurality of permanent magnets ( ) the polarity of which is alternated and which are arranged linearly and an armature ( ) facing the array of the permanent magnets ( ) through a magnetic air gap, wherein the armature ( ) comprises an armature core ( ) having main teeth ( ) and slots ( ), an armature winding ( ) wound in the slots of the armature core ( ), and auxiliary teeth ( ) provided at both the ends of the armature core ( ). The distance &tgr; between the centers of the auxiliary teeth ( ) and the pitch &tgr; of the field poles satisfy a relation &tgr; &equals;(2 &minus;1)&times;&tgr; /2 (n is a positive integer) and the length O of the auxiliary teeth ( ) is in a relation of O<Hd<Ht where Hd is the length of the auxiliary teeth ( ) in the direction orthogonal to the array of permanent magnets and Ht is the length of the main teeth ( ) in the direction orthogonal to the array of permanent magnets. Thus a high performance permanent magnet synchronous linear motor having reduced cogging thrust can be provided.

Growing community of inventors

Kitakyushu, Japan

Motomichi Ohto