A rotating electric machine includes an armature and a field rotor. The field rotor includes magnetic pole teeth, an annular body portion, a bypass gap portion and permanent magnets. The magnetic pole teeth are arranged so that the polarities thereof alternate between N and S in a circumferential direction of the field rotor. The annular body portion connects the magnetic pole teeth at their root portions. The bypass gap portion is provided on an opposite side of the annular body portion to the magnetic pole teeth. The permanent magnets are provided in the annular body portion so as to be spaced from one another in the circumferential direction. The bypass gap portion includes first magnetic gaps each of which is formed adjacent to one of the permanent magnets. Each of the permanent magnets is arranged within an inter-pole angular range between one circumferentially-adjacent pair of the magnetic pole teeth.

A rotor includes at least one first permanent magnet and at least one second permanent magnet. The at least one first permanent magnet forms part of an outer peripheral surface of the rotor and is magnetized to have polar anisotropy. The at least one second permanent magnet is adjacent to the at least one first permanent magnet in a circumferential direction of the rotor and has lower magnetic force than magnetic force of the at least one first permanent magnet.

A motor includes a rotor having a rotation shaft, a rotor core fixed with respect to the rotation shaft, a magnet attached to the rotor core, and a bearing attached to the rotation shaft. The magnet constitutes a first magnetic pole, and a part of the rotor core constitutes a second magnetic pole. The motor also includes an annular stator surrounding the rotor from outside in a radial direction about a center axis of the rotation shaft, a bearing holding member holding the bearing, and a resin portion covering the stator and the bearing holding member.

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.

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.

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.

A multi-degree-of-freedom electromagnetic machine includes a spherical structure, a first coil, a second coil, a non-magnetic structure, and a Halbach array. The spherical structure has a first axis of symmetry, a second axis of symmetry, and a third axis of symmetry, and the first, second, and third axes of symmetry are disposed perpendicular to each other. The first coil is wound on the spherical structure about the first axis of symmetry, and the second coil is wound on the spherical structure about the second axis of symmetry. The non-magnetic structure is spaced apart from, and at least partially surrounds, the spherical structure. The Halbach array is mounted on the non-magnetic structure and includes N-magnets, where N is a multiple of 4. The spherical structure and non-magnetic structure are mounted to allow relative rotation between the non-magnetic structure and the spherical structure.

A multi-degree-of-freedom electromagnetic machine includes a spherical structure, a first coil, a second coil, a non-magnetic structure, and a Halbach array. The spherical structure has a first axis of symmetry, a second axis of symmetry, and a third axis of symmetry, and the first, second, and third axes of symmetry are disposed perpendicular to each other. The first coil is wound on the spherical structure about the first axis of symmetry, and the second coil is wound on the spherical structure about the second axis of symmetry. The non-magnetic structure is spaced apart from, and at least partially surrounds, the spherical structure. The Halbach array is mounted on the non-magnetic structure and includes N-magnets, where N is a multiple of 4. The spherical structure and non-magnetic structure are mounted to allow relative rotation between the non-magnetic structure and the spherical structure.

An apparatus for the conversion of energy has a rotatable rotor mounted within a stationary stator. The rotor has a main rotor portion and several rotor magnet assemblies mounted for radial, reciprocating lateral movement relative to the main rotor portion. Each rotor magnet assembly includes a movable arm and a rotor magnet mounted to the outermost end or outboard end of the arm. The stator includes a peripheral mount or housing and a series of stator magnets coupled to the peripheral housing. The stator magnets has the same polarity as the adjacent rotor magnet. The stator magnets and peripheral housing are arranged in a. somewhat spiral configuration between a first or starting end and a second or finishing end and has a space therebetween. The starting end is positioned distally from

An apparatus for the conversion of energy has a rotatable rotor mounted within a stationary stator. The rotor has a main rotor portion and several rotor magnet assemblies mounted for radial, reciprocating lateral movement relative to the main rotor portion. Each rotor magnet assembly includes a movable arm and a rotor magnet mounted to the outermost end or outboard end of the arm. The stator includes a peripheral mount or housing and a series of stator magnets coupled to the peripheral housing. The stator magnets has the same polarity as the adjacent rotor magnet. The stator magnets and peripheral housing are arranged in a. somewhat spiral configuration between a first or starting end and a second or finishing end and has a space therebetween. The starting end is positioned distally from