An axial-flux generator for fluid turbines has a continuously variable generator that is constructed of a pair of rotors that move radially across a stator resulting in varying torque and varying power output. In one embodiment the rotors are normally held proximal to the center of a stator by spring tension. The stator is larger than the normally held position of the rotors. As the angular velocity of the rotors increases, the rotors move radially toward the perimeter of the stator, thus encountering a greater stator surface area providing increased torque, increased power generation and a higher-rated output speed when used with a fluid turbine.

An axial gap motor having a rotor and a stator core. A plurality of pressed powder teeth extends in a radial direction of the stator core and each has a trapezoidal shape in which a circumferential length of a pressed-powder-tooth-radial-direction-outer-end portion is larger than a circumferential length of a pressed-powder-tooth-radial-direction-inner-end portion. The rotor includes a plurality of field magnets, each configured such that a circumferential length of a magnet-radial-direction-inner-end portion is greater than or equal to a circumferential length of a magnet-radial-direction-outer-end portion. When the rotor and the stator core rotate relative to each other about a rotation axis, a part of the field magnets first overlaps with pressed-powder-tooth-radial-direction-inner portions of pressed powder teeth, and while the field magnets are located at a q-axis position with respect to the pressed powder teeth, adjacent ones of the field magnets individually overlap with one pressed powder tooth.

A passive magnetic bearing employs eddy currents in a copper core between neodymium annular magnets to support the copper core and an associated rotating shaft. The copper core has an annular flange that is coaxial with a hollow cylinder. The hollow cylinder supports a rotating shaft. An annular iron core is coaxial with and surrounds the annular flange. Annular neodymium magnets surround the upper and lower portions of the hollow cylinder. In some embodiments a touch-down bearing is made up of an upper and a lower bearing race that are spaced away from the upper surface and lower surface of the annular flange. The core rotates over the bearing race(s) until sufficient magnetic flux is generated to support the copper core and hence the shaft. Once spinning, a magnetic field is generated in the copper core.

A rotor of electric motor is described comprising: a disc with a major surface and a rotation axis (X), the major surface of the disc comprising a circular recess in which a circular band or ring of material is arranged, the material being capable of magnetizing itself under the action of a magnetizing magnetic field, and internally partitioned into areas electrically isolated from one another, a circular series of permanent magnets arranged about the rotation axis (X) and resting on the circular band, a grid fixed to the disc for maintaining the position of the magnets on the disc.

A rotor of electric motor is described comprising: a disc with a major surface and a rotation axis (X), the major surface of the disc comprising a circular recess in which a circular band or ring of material is arranged, the material being capable of magnetizing itself under the action of a magnetizing magnetic field, and internally partitioned into areas electrically isolated from one another, a circular series of permanent magnets arranged about the rotation axis (X) and resting on the circular band, a grid fixed to the disc for maintaining the position of the magnets on the disc.

One variation of a system for an electric motor includes a set of coil assemblies defining: an inner radial facet, an outer radial facet, a first axial facet, and a second axial facet opposite the first axial facet. Additionally, each coil assembly in the set of coil assemblies includes a receiving member arranged at the outer radial facet of the coil assembly. Furthermore, the system includes a rotor comprising a set of magnetic elements: encompassing the inner radial facet, the outer radial facet, the first axial facet, and the second axial facet of the set of coil assemblies; and defining a radial magnetic tunnel. The system also includes a housing: engaging the receiving member of each coil assembly, in the set of coil assemblies to couple the housing to the set of coil assemblies; and includes a shaft coupled to the set of magnetic elements.

Systems and methods relate to a vertical takeoff and landing (VTOL) platform that can include a stator and a rotor magnetically levitated by the stator. The rotor and stator can be annular, such that the rotor rotates about a rotational axis. The stator can include magnets that provide guidance, levitation, and drive forces to drive the rotor, as well as to control operation of rotor blades of the rotor that can be independently rotated to specific pitch angles to control at least one of lift, pitch, roll, or yaw of the VTOL platform. Various controllers can be used to enable independent and redundant control of components of the VTOL platform.

Electrical machines as provided herein can include a shaftless rotor with an annular array of permanent magnets; and a stator with an annular ferromagnetic core and a plurality of electromagnetic inductors about the ferromagnetic core. The stator is located adjacent to and substantially co-axial with the shaftless rotor; and a fluid thrust bearing located in an axially planar gap between the stator and the shaftless rotor.

An axial gap motor stator core includes a yoke portion made up of a metallic plate member or the like and including a lock portion and a tooth portion constituting a dust core including a lower surface which is a locking target to be locked on the lock portion. An axial gap motor stator core manufacturing method includes forming a yoke portion including a plurality of lock portions, which are projecting portions, by pressing, for example, a metallic plate member and fixing the tooth portion to the yoke portion by inserting the lock portions into the tooth portion.

An axial gap motor stator core includes a yoke portion made up of a metallic plate member or the like and including a lock portion and a tooth portion constituting a dust core including a lower surface which is a locking target to be locked on the lock portion. An axial gap motor stator core manufacturing method includes forming a yoke portion including a plurality of lock portions, which are projecting portions, by pressing, for example, a metallic plate member and fixing the tooth portion to the yoke portion by inserting the lock portions into the tooth portion.