Mitsubishi Electric Corporation

Ryogo Takahashi

Hiroki Aso

Takaya Shimokawa

Takanori Watanabe

Kazuma Nomoto

Kazuchika Tsuchida

Junichiro Oya

Hiroyuki Ishii

Mineo Yamamoto

Yuto Urabe

Tomoaki Oikawa

Naoki Tamura

Daisuke Morishita

An electric motor includes a rotor having 10×N (N is an integer equal to or larger than 1) magnetic poles and a stator including 9×N teeth. A center tooth includes a first main body and a first tooth end portion. A downstream-side tooth includes a second main body and a second tooth end portion. The electric motor satisfies TCR>TBR, where TCR is a maximum length of the first upstream-side portion in the first upstream-side radial direction of the first tooth end portion and TBR is a maximum length of the second upstream-side portion in the second upstream-side radial direction of the second tooth end portion.

Electric motor, fan, and air conditioner

A motor includes a rotor and a stator. In a plane orthogonal to an axis direction of the rotor, the motor satisfies W<W<Mand T<W<T×Twhere Mis a width of a surface of a permanent magnet, Wis a maximum width of a portion of an inner wall of a first magnet insertion hole in contact with the surface, Wis a minimum width from the first magnet insertion hole to a second magnet insertion hole, Tis a width of a first front end surface of a first tooth, and Tis a width from the first front end surface to a second front end surface of a second tooth.

Motor, fan, and air conditioner

A motor includes a rotor having a shaft, a rotor core, and a permanent magnet, and a stator surrounding the rotor. The permanent magnet forms a magnet magnetic pole, a part of the rotor core forms a virtual magnetic pole. The motor includes first and second bearings support the shaft, and further includes first and second bearing support portions. Of the first and second bearings, the first bearing is located on the load side. A distance Dfrom the center axis to the inner circumferential surface of the first bearing support portion, a distance Dfrom the center axis to the inner circumferential surface of the second bearing support portion, a distance dfrom the center axis to the outer circumferential surface of the first bearing, and a distance dfrom the center axis to the outer circumferential surface of the second bearing satisfy D−d<D−d

A motor includes a rotor having a rotation shaft and a bearing mounted to the rotation shaft, a stator surrounding the rotor, a heat dissipation member provided on one side of the rotor in an axial direction of the rotation shaft, and a resin portion covering the stator and at least a part of the heat dissipation member. The heat dissipation member has a first concave portion surrounding the bearing from an outer side in a radial direction about the rotation shaft, and a second concave portion famed on an inner side of the first concave portion in the radial direction.

Motor, fan, air conditioner, and manufacturing method of motor

A rotor includes a shaft made of a stainless steel, an annular rotor core surrounding the shaft from an outer side in a radial direction about a center axis of the shaft, a magnet attached to the rotor core, and a separating portion provided between the shaft and the rotor core and having electric insulation property. The magnet constitutes a first magnetic pole, and a part of the rotor core constitutes a second magnetic pole. The rotor core has an inner circumference facing the shaft and an outer circumference opposite to the inner circumference. A radius R1 of the shaft and a maximum distance R2 from the center axis to the outer circumference of the rotor core satisfy R1/R2≥0.20.

Rotor, motor, fan, air conditioner, and manufacturing method of rotor

A motor includes a rotor, a stator, a circuit board attached to the stator, a heat dissipation member disposed on a side of the circuit board opposite to the stator, and a resin portion covering the stator, the circuit board, and at least a part of the heat dissipation member.

A motor includes a rotor and a stator provided to surround the rotor. The rotor has a rotor core having a magnet insertion hole and a permanent magnet disposed in the magnet insertion hole and is rotatable about a rotation axis. The stator has a stator core with a tooth facing the rotor, and a coil wound around the tooth. The permanent magnet has a thickness thicker than or equal to 2.1 mm in a direction in which the permanent magnet faces the stator and is magnetized in a direction of the thickness. A minimum gap AG (mm) between the rotor and the stator, a winding number Nt of the coil around the tooth, an overcurrent threshold Ip (A) for a current flowing through the coil, and a lower limit Hct (kA/m) of a coercive force of the permanent magnet satisfy Hct≥0.4×(Ip×Nt/AG)+410.

Motor that suppresses demagnetization of permanent magnet, fan, and air conditioner

A rotating machine includes: an electric motor that includes a stator and a rotor that is rotatable relative to the stator; a rotary member to be rotated that is provided on the shaft; and a fastening member made of magnetic material and provided to fasten the rotary member to a shaft. The rotor includes: a rotor core made of magnetic material; a plurality of permanent magnets attached to the rotor core such that the permanent magnets are spaced from each other in a circumferential direction and magnetic poles of the permanent magnets that face an outer peripheral side of the rotor core in a radius direction of the rotor core have the same magnetic polarity; and the shaft. The shaft is made of magnetic material, provided to extend through a central part of the rotor core in an axial direction of the rotor core, and magnetized by part of magnetic fluxes generated from the permanent magnets.

Rotating machine, outdoor unit of air conditioning apparatus, and air conditioning apparatus

A stator includes a first core that includes a first tooth extending in a first radial direction and a first core back extending in a circumferential direction and a second core that includes a second tooth extending in a second radial direction and a second core back extending in the circumferential direction. The first core back includes a depression formed with at least a first face and a second face in an outer peripheral surface of the first core back and a connection part facing the second core back. The stator satisfies θ1<θ2, where θ1 represents an angle between the first face and the first radial direction and θ2 represents an angle between the second face and the first radial direction.

Stator, motor, fan, air conditioner, and method for manufacturing stator

An electric motor includes a rotor, a stator assembly, and a plurality of heat dissipation members fixed to the stator assembly and to release heat of the stator assembly.

Electric motor, air conditioner, and method for producing electric motor

A motor includes an annular stator core having a plurality of core segments connected via connecting portions in a circumferential direction about an axis, a cover portion covering the stator core and having a core-surrounding portion surrounding the stator core from an outer side in a radial direction about the axis, and a rotor having a rotor core provided on an inner side of the stator core in the radial direction and a magnet attached to the rotor core. The magnet forms a first magnetic pole, and a part of the rotor core forms a second magnetic pole. A minimum distance Rin the radial direction from the axis to an outer circumference of the core-surrounding portion and a minimum distance Rin the radial direction from the axis to an outer circumference of the stator core satisfy R&#x2265;1.15&#xd7;R

A rotor includes a rotor core. A permanent magnet constitutes a first magnetic pole, and a part of the rotor core constitutes a second magnetic pole. In the second magnetic pole, a plurality of slits is symmetrically formed with respect to a magnetic pole center line connecting a pole center of the second magnetic pole and the center axis. On one side of the magnetic pole center line in a circumferential direction about the center axis, the plurality of slits has a first slit closest to the magnetic pole center line and a second slit adjacent to the first slit in the circumferential direction. A minimum distance L1 from the first slit to the outer circumference of the rotor core and a minimum distance L2 from the second slit to the outer circumference of the rotor core satisfy L1&#x3c;L2.

Rotor, motor, fan, and air conditioner

A motor includes a rotor having a rotation shaft, a rotor core attached to the rotation shaft, and a rotor magnet embedded in the rotor core, a stator disposed on an outer side of the rotor in a radial direction about a central axis of the rotation shaft and surrounding the rotor, a board disposed on one side of the stator in a direction of the central axis, and a microcomputer mounted on the board. The microcomputer is disposed on an outer side of the rotor magnet in the radial direction.

Motor with a board having microcomputer and drive circuit, and air conditioning apparatus having the motor

A rotor includes: a shaft; a rotor core having an annular shape and surrounding the shaft from outside in a radial direction about a center axis line of the shaft so as to leave a space therebetween; a magnet embedded in the rotor core; and a connecting portion disposed between the shaft and the rotor core and formed of a nonmagnetic material.

Rotor, motor, fan, and air conditioning apparatus

An electric motor includes a stator assembly, a rotor provided inside the stator assembly, and a heat sink to radiate heat from the stator assembly. The heat sink includes a base portion, and a heat radiating portion formed integrally with the base portion.

Growing community of inventors

Tokyo, Japan

Ryogo Takahashi