The invention provides a generator suited for drilling equipment, such as oil and gas applications. A turbine can drive the permanent-magnet, synchronous generator. The generator uses axial flux topology for a stator and a rotor. The design permits a wide airgap between the stator and rotor, so fluid and debris from drilling operations can flow through the generator relatively unobstructed, and the fluid flow can provide a power source to rotate the turbine coupled to the rotor to generate electrical power. The airgap can accommodate non-magnetic sealing plates to provide additional protection to the generator components. The rotor includes a Halbach magnet array of permanent magnets, producing high-intensity magnetic flux in an axial direction. The Halbach magnet array avoids any necessity for the conventional rotor back-iron to return the flux. The proposed generator is intended to generate electric power for drilling equipment, permitting the elimination of costly batteries.

It is provided a method of controlling a generator to reduce a harmonic torque ripple, the method including: measuring a first value of an acceleration using a first accelerometer mounted at a first position of the generator; measuring a second value of an acceleration using a second accelerometer mounted at a second position of the generator; deriving a vibration signal based on a combination of the first value and the second value of the acceleration; deriving, based on the vibration signal, an amplitude and a phase of a reference harmonic current; injecting a current into the generator based on the reference harmonic current.

Provided is a method for cooling an electric generator including the steps of: monitoring the temperature of the end winding and of the magnet through said first and second temperature sensors, if the temperatures of the end winding and/or of the magnet rises and reaches a first upper limit, operating the plurality of cooling fans for providing a first cooling power to the electric generator, if, while the first cooling power is provided, the temperature of the magnet reaches the second maximum acceptable temperature and the temperature of the end winding is lower than the first maximum acceptable temperature, operating the plurality of cooling fans for providing a second cooling power to the electric generator, the second cooling power being lower than the first cooling power.

Provided is a magnet structure (MS) which includes a plurality of permanent magnets (2) fixed onto a baseplate (1), and a cover structure (3) for covering the plurality of permanent magnets (2). The cover structure (3) includes a plurality of covers (3a) that is formed of a non-magnetic material and covers the plurality of permanent magnets (2). A relative position between the plurality of covers (3a) is fixed, and there is a gap (G) between the neighboring covers (3a).

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.

A forced-air battery charging system for a vehicle having an engine compartment includes a turbine assembly having a casing and a plurality of blades, the casing being positioned forwardly in the engine compartment for operably receiving ambient air as the vehicle travels forwardly and having an outlet expelling the ambient air. The plurality of blades are situated in the casing between the inlet and the outlet and are operable to rotate about an axis when impacted by the received ambient air in a direction askew to the axis. An electricity generator is operatively coupled to the plurality of blades. The system includes an air duct having walls that define a channel having proximal and distal ends, the proximal end being open and in communication with the casing outlet, the distal end being open through which the ambient air exits under the vehicle after passing through the air duct proximal end.

A vertical axis wind turbine assembly is described. Embodiments of the vertical axis wind turbine assembly can include a main support structure, a turbine blade sub-assembly, a wind directional panel sub-assembly, and a generator. Wind directional panels can be spaced radially about a plurality of turbine blades. Of note, adjacent wind directional panels can form a plurality of wind tunnels directing wind towards the plurality of turbine blades. The turbine blades can be coupled to an axle that is also coupled to the generator.

An eduction industrial power system is provided. The system includes one or more vertical-axis wind turbine power plants. Wind is accelerated through a multi-floor eductor of the power plant. Each floor of the eductor is configured with a constricted portion designed to increase the air speed through the eductor, such that low speed winds enter the eductor and much higher speed winds exit it. A plurality of rotor-blade assemblies disposed in the constricted portion of each floor of the multi-floor eductor are mounted to, and rotate, a shared vertical-axis rotor shaft to generate electricity, via a generator. The electricity generated can be stored, used or channeled to an electrical grid, as desired.

A turbine comprises a shaft (20), a mass (10) eccentrically mounted for rotation about shaft (20), having its center of gravity at a distance from the shaft (20) and a motion base (15). Motion base (15)rigidly supports the shaft (20), and is configured for moving the shaft (20) in any direction of at least two degrees of movement freedom, except for heave.

A floating vessel-turbine (120),encloses entirely the eccentrically rotating mass (10) and the motion base (15). The turbine converts ocean wave energy into useful energy, very efficiently.

The application relates to unidirectional hydrokinetic turbines having an improved flow acceleration system that uses asymmetrical hydrofoil shapes on some or all of the key components of the turbine. These components that may be hydrofoil shaped include, e.g., the rotor blades (34), the center hub (36), the rotor blade shroud (38), the accelerator shroud (20), annular diffuser(s) (40), the wildlife and debris excluder (10, 18) and the tail rudder (60). The fabrication method designs various components to cooperate in optimizing the extraction of energy, while other components reduce or eliminate turbulence that could negatively affect other component(s).