A multiple radial gap BLPMDC/BLPMAC motor/generator suitable for direct drive wind or other fluid medium driven turbines or other rotary machine application. Each rotor and stator segment are housed in a fixture having an intermediate interior ramp angularly inclined at an angle of from about 10 to about 80 to cause the rotor/stator segments to interact at the axis of rotation of the fluid medium driven rotating machine at the same angle.

A water flow turbine arrangement for capturing energy from water flows is provided. The arrangement includes: a base member (212); a generally open support structure (210) mounted to the base and upstanding therefrom, the support structure including plural legs (216) joined by a cross brace at or adjacent their upper ends; an electrical generator (230) mounted to the base; and shaft mounted turbine blades (220) mounted for rotation generally within the space occupied by the legs about a turbine axis. The turbine shaft (222) is supported at its upper end by the cross brace and is coupled to the generator at its lower end by a magnetic torque transmitting coupling, allowing complete fluid sealing of the generator's housing.

A horizontal axis wind turbine which includes a plurality of blades that rotate at relatively low rpms and produce a high torque to rotate a generator is described. The wind turbine provides more power at low to moderate wind speeds than conventional wind turbines, produces more power at low wind speeds while still operating at high wind speeds, begins generating power at very low wind speeds, produces less noise, and reduces animal (e.g., bird and bat) collisions. The method determines the number of blades for the wind turbine based upon the desired rpm for the wind rotor and the generator configuration is based upon the estimated torque generated by the number of blades.

Methods, systems, and devices are disclosed for wave power generation. In one aspect, a wave power generator device includes a stator assembly and a rotor assembly encased within a tube frame. The stator assembly includes an array of inductor coils in a fixed position within a cavity of the tube frame and a plurality of bearings coupled to the tube frame. The rotor assembly includes a turbine rotor having a central hub and peripheral blades coupled to a high inertia annular flywheel that is moveably engaged with the bearings of the stator assembly, and an array of magnets arranged to be evenly spaced and of alternating axial polarity from one another extending from the annular flywheel into the cavity between the array of inductor coils, such that electric currents are produced based on magnetic field interaction of the magnets with the inductor coils during the rotation of the annular flywheel.

A turbine generator assembly for generating power from a fluid flow, the assembly comprising: a housing for directing fluid flow, a turbine generator having a longitudinal axis of extension, enclosed in said housing, said turbine generator comprising: a plurality of blades provided on a central rotational axis being parallel with the longitudinal axis, a rotor, and a stator arranged peripherally and annular to the rotor; at least one of the plurality of blades being provided in fixed arrangement with the rotor, and wherein the stator of the turbine generator comprises a plurality of segments each having a coil length parallel to the longitudinal axis of the turbine, and a radial coil thickness, wherein at least two stator segments have different coil lengths and/or thickness to each other.

A direct drive rotary generator formed of an elongate cylindrical series of stator annuli and a coaxial elongate cylindrical series of armature annuli and mounted for relative rotational movement around their common axis, the series of stator annuli interleaving the series of armature annuli, and either of the armature/stator annuli having a contiguous or substantially contiguous sequence of coils around its circumference, and the other of the armature/stator annuli having a corresponding sequence of permanent magnets of alternating polarity spaced around its circumference and at the same pitch as that of the coils, the arrangement being such that lines of magnetic flux passing across the air gap between one magnet carrying annulus to the next cut the turns of the coils of the corresponding interleaved coil carrying annulus, and thus induce in the coils electromagnetic forces as the armature is caused to rotate relative to the stator.

A magnetic cycloid gear assembly includes an outer magnet drum comprising a plurality of outer drum magnets having a first number of magnetic pole pairs. The assembly also includes a first inner magnet drum comprising a first plurality of inner drum magnets having a second number of magnetic pole pairs. The assembly also includes a second inner magnet drum comprising a second plurality of inner drum magnets having a third number of magnetic pole pairs. Each of the first and second inner drums has an inner magnet drum axis that is offset from an outer magnet drum axis. The assembly further includes a plurality of drive mechanisms, each mechanism being operatively coupled to each of the first and second inner drums. The plurality of drive mechanisms is configured to drive each of the first and second inner magnet drums to revolve in an eccentric manner about the outer drum axis.

An electrical generator (114) and a power electronics interface (115) for a direct-drive turbine (110). The turbine (110) may include a rotor (112) for transforming kinetic (from, e.g., wind, water, steam) into mechanical energy, the generator (114) for transforming the mechanical into electrical energy, and the power electronics interface (115) for conditioning the electrical energy for delivery to a power distribution grid (124). The interface (115) includes a three-phase single-stage boost inverter (120) for converting a lower DC voltage into a higher AC voltage, and which uses a synchronous reactance of the generator (114) as a DC-link inductance. The turbine (110) has neither the gearbox of indirect-drive designs nor the electrolytic capacitor bank of conventional direct-drive designs, while still allowing for a substantially smaller number of generator poles, resulting in reduced size, weight, complexity, and cost.

A wind power generator includes an air exhaust unit, a generating unit, a rectifier, and a storage battery. The air exhaust unit includes a fan, a wind guide disk, and a base. The fan is provided with a bearing which is connected with a primary gear. A driven gear is connected with a transmission bearing and meshes with the primary gear. The generating unit includes a stator including a plurality of magnetic poles, and a rotor surrounding the stator and provided with a plurality of magnets. The rotor is connected with the transmission bearing. After the fan is rotated, the bearing drives the primary gear which drives the driven gear which drives the transmission bearing which drives and rotates the rotor.

A wind turbine apparatus including: a blade portion a generator having a stator having a plurality of coils and a rotor having a plurality of magnets, the rotor being connected to the blade portion such that rotation of the blade portion and rotor generates a current within the coils.