A propulsion system, comprising: a fan blade housing; a plurality of fan blades within the fan blade housing; one or more rows of permanent magnets, affixed to the outside of the fan blade housing; one or more fan blade bearings; one or more magnetic field generators affixed to the one or more fan blade bearings and corresponding to the one or more rows of permanent magnets, the magnetic field generators configured to cause the permanent magnets to be propelled forward in the same direction, thereby causing the fan blade housing to which they are attached, and the fan blades within, to spin.

A rotary electrical machine comprises: a mechanical motor/generator assembly, and optional electronics. The mechanical motor/generator assembly comprises: a core assembly, and an armature assembly. The core assembly comprises two magnet assemblies, which are positioned to define an air gap therebetween and produce time invariant magnetic fields in the air gap. The armature assembly comprises: an armature, and one or more conductors that are mounted to the armature and positioned in the air gap. Either the core assembly or the armature assembly may be mounted to a rotating element, while the other is mounted to a stationary element. During operation as a motor, electrical current flows in alternating directions in the one or more conductors, to produce torque on the armature and rotating element. During operation as a generator, electrical current is produced in the one or more conductors when torque is applied to the rotating element and the armature.

A motor includes: a first portion that includes a plurality of permanent magnets; and a second portion that includes a plurality of coils, wherein the first portion or the second portion is configured to be rotatable around a rotation axis, wherein the plurality of permanent magnets are circumferentially arranged about the rotation axis, and wherein the plurality of coils are arranged so as to face the plurality of permanent magnets in a direction along the rotation axis, and the motor further includes: a control unit that controls a rotational speed and an attitude of the rotating first portion or the rotating second portion by controlling currents that are applied to the plurality of coils.

A power feeding device includes: a generator, the generator including a stator fixed to a wheel and a cylindrical rotor that rotates around a rotation axis of the wheel; an inertial member that is fixed to the cylindrical rotor and maintains a constant attitude by its own weight; a circuit board that is fixed to the stator and is mounted with a power feeding circuit to supply an output of the generator to a load; and a circuit receiving space that is provided inside the cylindrical rotor and receives a whole of the circuit board or an element that is mounted on the circuit board and protrudes from the circuit board.

A propulsion system, comprising: a fan blade housing; a plurality of fan blades within the fan blade housing; one or more rows of permanent magnets, affixed to the outside of the fan blade housing; one or more fan blade bearings; one or more magnetic field generators affixed to the one or more fan blade bearings and corresponding to the one or more rows of permanent magnets, the magnetic field generators configured to cause the permanent magnets to be propelled forward in the same direction, thereby causing the fan blade housing to which they are attached, and the fan blades within, to spin.

The present invention provides a rotor comprising: a rotor core; a plurality of magnets disposed outside the rotor core; and a molding part disposed outside the plurality of magnets, wherein the rotor core includes a plurality of guide protrusions disposed between the plurality of magnets, and the distance from the center of the rotor core to the outer surface of the molding part passing across the center of one of the guide protrusions is shorter than the distance from the same to the outer surface of the molding part passing across the center of one of the plurality of magnets.

A radial flux synchronous machine includes a stator in a cylindrical shape provided with a plurality of magnetic poles, an inner rotor disposed radially inward of the stator and having an inner armature opposing the magnetic pole from radially inward, and an outer rotor disposed radially outward of the stator and having an outer armature opposing the magnetic pole (from radially outward.

A radial flux synchronous machine includes a stator in a cylindrical shape provided with a plurality of magnetic poles, an inner rotor disposed radially inward of the stator and having an inner armature opposing the magnetic pole from radially inward, and an outer rotor disposed radially outward of the stator and having an outer armature opposing the magnetic pole (from radially outward.

A rotor core has first and second magnet insertion holes along an outer circumference, and first and second slits along an inner circumference. The first and second slits have first and second facing portions facing each other. The first facing portion has a first inner end and a first outer end. The second facing portion has a second inner end and a second outer end. An inter-slit portion is provided between the first and second facing portions and is defined by a first straight line connecting the first and second inner ends and a second straight line connecting the first and second outer ends. In a radial direction of the rotor core, a minimum distance D1 from the inner circumference to the slits, a minimum width W1 of the slits, and a length W2 of the inter-slit portion satisfy at least one of D1<W1 and D1<W2.

An integrated starter-generator (ISG) system includes a flux-regulated permanent magnet machine (PMM), a wound-field synchronous machine, and a control coil controller. The flux-regulated PMM includes a stationary portion having a control coil and a plurality of permanent magnets, and a rotating portion that includes rotating armature windings. The wound-field synchronous machine includes a stationary portion that includes a main armature winding and a rotating portion that includes a main field winding that receives excitation from the flux-regulated PMM. The control coil controller controls current supplied to the control coil of the flux-regulated PMM to selectively control magnetic flux presented to the rotating armature windings.