Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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 R1 in the radial direction from the axis to an outer circumference of the core-surrounding portion and a minimum distance R2 in the radial direction from the axis to an outer circumference of the stator core satisfy R1?1.15×R2.

Abstract: 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<L2.

Abstract: 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.

Abstract: 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.

Abstract: 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 R1 in the radial direction from the axis to an outer circumference of the core-surrounding portion and a minimum distance R2 in the radial direction from the axis to an outer circumference of the stator core satisfy R1?1.15×R2.

Abstract: 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.

Abstract: A rotor includes a shaft, 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 formed of a nonmagnetic body. 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. The separating portion has an outer circumference in contact with the inner circumference of the rotor core. A radius R1 of the shaft, a minimum distance R2 from the center axis to the outer circumference of the separating portion, and a maximum distance R3 from the center axis to the outer circumference of the rotor core satisfy (R2?R1)/(R3?R2)?0.41.

Abstract: 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.

Abstract: 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<L2.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.