Mitsubishi Electric Corporation

Ryuichi Takiguchi

Masatsugu Nakano

Yu Hirotani

Satoru Akutsu

Yuji Takizawa

Takanori Komatsu

Yoshihito Asao

Toshinori Tanaka

Morishige Minobe

Satoru Nakada

Shunta Kashima

Akira Hashimoto

Shinichi Yamaguchi

Tetsuya Kojima

Takashi Umeda

Toru Ogawa

Tetsuya Iwata

Hiroko Ueyama

Katsunori Oki

Shuhei Niikura

Kazumasa Ito

Satoshi Azuma

Isao Kezobo

Atsushi Sakaue

Yuji Nakahara

Hironori Tsuiki

Yusuke Morita

Satoru Hasegawa

Kodai Okazaki

Kosuke Nakano

Naohiro Motoishi

Kenta Motoyoshi

Eigo Totoki

Tomoya Uchimura

Shoji Ishikawa

Susumu Oshima

To obtain an electromagnetic actuator capable of improving a thrust force of a movable element. Provided is an electromagnetic actuator, including: a stator, which has a first surface at one end in an axial direction and a second surface at another end in the axial direction, and is made of a soft magnetic material having a tubular space formed in the axial direction; and a movable element, which is disposed in the tubular space, and is configured to move along the axial direction, wherein the stator includes: a coil; a core portion; and a protrusion portion, wherein the movable element includes a movable element core made of a soft magnetic material and a permanent magnet, and wherein at least one of a radially inner side and a radially outer side of the permanent magnet is covered by a movable element core.

Electromagnetic actuator and hydraulic pressure adjustment mechanism

Provided is a rotating electric machine, including: a stator including: an annular core back; and a plurality of teeth projecting in a radial direction from the core back and being arranged in a circumferential direction, the plurality of teeth having slots each formed between the plurality of teeth adjacent to each other in the circumferential direction; and a rotor including: an annular rotor core which is arranged coaxially with the stator through a magnetic gap; and a plurality of magnetic poles arranged on the rotor core in the circumferential direction, wherein the rotor core includes a plurality of segment cores formed by dividing the rotor core in the circumferential direction with at division surfaces, and wherein the number of segments of the rotor core is different from a divisor and a multiple of the greatest common divisor of the number of poles of the rotor and the number of slots.

Rotating electric machine

A permanent magnet synchronous machine includes a stator including a plurality of split core blocks that are continuously arranged in a rotation direction of a rotor. The plurality of split core blocks each includes: a permanent magnet; a pair of teeth arranged on both ends of the permanent magnet so as to sandwich the permanent magnet in the rotation direction; and connection teeth, which are provided on axial end portions of the pair of teeth sandwiching the permanent magnet, and are configured to connect the pair of teeth.

Permanent magnet synchronous machine and method for manufacturing permanent magnet synchronous machine stator

In a permanent magnet type concentrated winding motor, the number of magnetic poles is M, a stator Sr has an N number of teeth T around which coils are concentratedly wound and which are circumferentially arranged at equal intervals, M is equal to (18&#xb1;4)n and N is equal to 18n, an armature winding AW has an m number of parallel circuits, and a 1-phase circuit of the parallel circuits is configured to have a 6n/m number of coils connected in series with each other.

Permanent magnet type concentrated winding motor

An excitation winding is wound around each tooth of a detecting stator core. First output winding and second output winding are wound around mutually different teeth while avoiding winding of the output windings with the same phase around two teeth adjacent to each other in a circumferential direction. When the number of pole pairs of the excitation winding is M that is an integer equal to or greater than 1 and the number of salient poles of a detecting rotor is N that is an integer equal to or greater than 1, a spatial distribution of the number of turns in each of the first and second output winding is obtained by a function represented by a sine wave of a spatial order |M&#xb1;N|. An error spatial order &#x3b4; represented by |M&#x2212;|M&#xb1;N&#x2225; and an error spatial order &#x3b5; represented by |&#x3b4;&#x2212;M| are values other than 1 and 2.

Rotation angle detector, rotating electrical machine, and elevator hoisting machine

In a resolver, a detecting stator core includes a first detection winding group, a second detection winding group, and a plurality of excitation windings. The first detection winding group includes a plurality of first windings as detection windings. The second detection winding group includes, as detection windings, a plurality of second windings different from the first windings in the phase of the detection voltage. The excitation windings are each wound around one of teeth of the detecting stator core. Each first winding and each second winding are wound around different teeth from each other without being wound around the same tooth. The detection winding and the excitation winding that are wound around the same tooth are arranged so as to be separated from each other in a radial direction.

Resolver, rotating electrical machine, and elevator hoisting machine

A core segment linked body when opened out rectilinearly is configured: such that a distance between adjacent width reduced portions is greater than a width dimension of width expanded portions when adjacent core segments are in an expanded position, and the distance between the adjacent width reduced portions is less than the width dimension of the width expanded portions when the adjacent core segments are in a contracted position; and so as to satisfy (te&#x2212;tn)/&#x3c4;s'&#x3e;0, and 0&#x3c;(te&#x2212;tn)/te&#x2264;0.27, where &#x3c4;s&#x2032; is a distance between center lines of the adjacent magnetic pole teeth in the expanded position, te is a width dimension of tooth main portions, and tn is the width dimension of the width reduced portions.

Rotary electric machine armature core and rotary electric machine

In a reference state of a rotation angle detector, plural first output coils include first output coils having the number of windings of Ai and Aj, plural second output coils include second output coils having the number of windings Bk and Bm. The rotation angle detector includes at least one configuration from among: a configuration in which the numbers of windings of the first and second output coils are the same numbers of windings as in the reference state, with the exception that the number of windings Ai is the number of windings Ai&#xb1;a or the number of windings Aj is the number of windings Aj&#xb1;a; and a configuration in which the number of windings Bk is the number of windings Bk&#xb1;b or the number of windings Bm is the number of windings Bm&#xb1;b.

Rotation angle detector, rotary electrical machine and elevator hoisting machine

In a core for a rotary electric machine, first end portions of back yoke portions are linked to second end portions of back yoke portions of adjacent core segments so as to be rotatable around pivot portions. Each of the core segments is configured by alternately laminating first core segment sheets and second core segment sheets. The pivot portions are constituted by interfitting protruding portions that are formed on the first core segment sheets. The core segments are displaceable relative to the adjacent core segments between a contracted position in which spacing between the magnetic pole tooth portions is contracted and an expanded position in which spacing between the magnetic pole tooth portions is expanded, when the core segment linked body is opened out rectilinearly.

Core for rotary electric machine

A permanent magnet motor includes: a stator including: a stator core in which teeth are respectively arranged circumferentially so as to protrude radially inward from an annular core back; an armature winding that is mounted to the stator core; and a frame that holds the stator core in an internally fitted state; and a rotor that includes a rotor core and permanent magnets, the armature winding being constituted by a plurality of coils that are respectively wound so as to be concentrated on the teeth, wherein: inner circumferential ends of adjacent teeth are connected together by a connecting portion; and 0.122&#x2266;(t2+t3)/r4&#x2266;0.202 is satisfied, where t2 is a thickness of the core back, t3 is a thickness of the frame, and r4 is an outside radius of the frame.

Permanent magnet motor and driving apparatus-integrated permanent magnet motor

R1&#x3e;R2&#x3e;R3 is satisfied, where R1 is a radius of curvature of a cylindrical surface that contacts circular arc-shaped curved surfaces arranged circumferentially, R2 is a radius of curvature of the circular arc-shaped curved surfaces, and R3 is a radius of curvature of an upper surface of permanent magnets, air gaps are formed on radially outer portions of two circumferential side portions of magnet housing apertures, surfaces that contact two circumferential side surfaces of the permanent magnets so as to be parallel to a radial direction are disposed on radially inner portions of the two circumferential end portions, and B2&#x3e;B1 is satisfied, where B1 is a thickness of a core portion of the rotor core between the circular arc-shaped curved surfaces and the magnet housing apertures at a magnetic pole center, and B2 is a thickness of a circumferential end portion of the core portion.

Embedded permanent magnet rotary electric machine

A permanent magnet motor in which electromagnetic excitation force of low spatial order is reduced, and influence of a magnetomotive force harmonic of a rotor and torque ripple is reduced. One set of armature windings receives current from a first inverter, and another set of armature windings receives current from a second inverter. Where a pole number of a rotor is M and the number of slots of a stator core is Q, M and Q satisfy M&#x3c;Q and a greatest common divisor of M and Q is equal to or greater than 3. In the rotor, the iron core is located beyond a radius intermediate the maximum outer radius and the minimum inner radius of the permanent magnets. A phase difference between three-phase currents from the first and second inverters is in a range of electrical angles of 20 to 40 degrees.

Permanent magnet motor

Provided is a permanent magnet motor that realizes reduction of both cogging torque and torque ripple, and also downsizing and weight reduction together with torque ripple reduction. When two sets of three-phase armature windings are defined such that a first armature winding-corresponds to Uphase, Vphase, and Wphase and a second armature winding-corresponds to Uphase, Vphase, and Wphase, Uphase is provided in both of any adjacent slots of a plurality of slots, or at least one of Uphase and Uphase is provided in one of any adjacent slots, Uphase, Vphase, and Wphase are shifted by an electric angle of 20&#xb0; to 40&#xb0; from Uphase, Vphase, and Wphase upon driving, and a slot opening width Ws of a stator iron coreis set to satisfy Ws/(2&#x3c0;Rs/Ns)&#x2266;0.15, where Rs is an inner radius of the stator iron core and Ns is a slot number of the stator iron core.

The present invention provides a brushless motor in which the voltage utilization ratio can be increased and the torque and output of the motor can thereby be increased, and also provides a drive method for a brushless motor. The brushless motor includes an armature constituted by an armature core having armature windings of a plurality of phases, and a field pole constituted by a field pole core having a plurality of permanent magnets. A voltage, in which at least a 5th order harmonic component is superimposed on a 1st order fundamental wave of a voltage under predetermined phase difference condition and amplitude condition in order to increase a 1st order fundamental wave peak of the applied voltage over an applied voltage peak, is applied to the armature windings.

Brushless motor, external AC voltage source, and electric power steering device

A coil is configured so that: N conductor wires of wave windings each divided at at least two positions in a circumferential direction are provided in one of a plurality of slots; within a unit of the divided wave windings in which conduction is made, the N conductor wires are connected in one of series and parallel to each other at division positions located at substantially the same circumferential position of conductor-wire end portions; division units of the divided wave windings are connected in series to each other, and a total number of series turns of the series-connected division units of the each phase is a predetermined number of series turns, which does not exceed an upper limit value of a terminal voltage of the rotary electric machine; and the series-connected division units of the each phase have the same total number of series turns.

Growing community of inventors

Chiyoda-ku, Japan

Ryuichi Takiguchi