A method and system are provided for cooling a heat-exchanger in a wind turbine that has an electric generator with a cooling air flow directed therethrough. Effluent cooling air flow from the electric generator is directed into an air ejector pump and acts as motive air through the air ejector pump. Cold air is drawn into the air ejector pump by the vacuum generated by the motive air moving through the air ejector pump. The heat exchanger is disposed in-line with the cold air flow so that the cold air is drawn through the heat-exchanger, removes heat from the fluid circulated through the heat-exchanger, and becomes heated air that is combined with the motive air and discharged from the nacelle.

A wind-powered generator includes a housing having an inlet, an outlet, and a throat that are coaxial about an axis of symmetry of the housing. A nacelle includes a first rotor mounted on a first end of the nacelle and positioned at least partially within the inlet, the first rotor outputting a first power output, and a second rotor mounted on a second end of the nacelle, the second rotor being positioned at least partially within the outlet and having a diameter less than the first rotor. The second rotor outputting a second power output. The first and second power outputs are combined to provide a combined power output, and a nacelle ratio between outer diameters of the nacelle at the inlet and at the outlet is between about 1.60-1.70, and a housing ratio between inner diameters of the housing at the inlet and at the outlet is about 1.85-1.97.

A rotor assembly includes a rotor mast, a rotor and a pivot arrangement. The rotor mast is for rotatable attachment of the rotor assembly to a support structure for rotation of the rotor assembly relative to the support structure about a rotation axis. The rotor has two rotor blades extending in a virtual plane in a longitudinal direction. The two rotor blades are arranged to be propelled by air flow. The pivot arrangement defines a pivot axis. The rotor is pivotably connected to the rotor mast for pivoting the two rotor blades simultaneously relative to the rotor mast about the pivot axis. The longitudinal direction and a projection of said pivot axis in the virtual plane enclose a constant acute angle in the virtual plane. A windmill and a wind farm includes the rotor assembly with a capacity in the range of 15-50 MW/km.sup.2.

A method for detecting an electrical fault in the stator of an electric machine is provided, wherein the stator includes multiple groups of windings, wherein the windings of each group are assigned to a respective phase of the electric machine, including the steps of: determining a respective current firstly between a subgroup of one of the groups of windings and a distinct further subgroup of the same group of windings and/or secondly between a subgroup of one of the groups of windings and a neutral point, and/or thirdly between a neutral point and either a further neutral point or to a common neutral point connected to at least the neutral point and the further neutral point, evaluating a fault condition, wherein the fulfilment of the fault condition depends on the respective determined current, and outputting a fault signal to personal and/or a device when the fault condition is fulfilled.

The present disclosure relates to armature assemblies for assembling a permanent magnet electrical machine and to methods for assembling a permanent magnet electrical machine. An armature assembly comprises an armature with a plurality of coils. The armature assembly further comprises a power source and a control system configured to selectively feed the plurality of coils when one of a field comprising one or more permanent magnets and the armature approaches the other of the field and the armature during an assembly of a permanent magnet electrical machine. A permanent magnet electrical machine may be a permanent magnet generator for a wind turbine, and in particular for a direct-drive wind turbine.

A system for generating electricity using wind power for an electric vehicle (EV). The system converts wind to electricity for charging the EV's primary batteries, or to provide supplemental electricity to other EV systems, such as heating and cooling. The system comprises an air intake that compresses air along a narrowing path to a turbine component. The turbine component comprises a cylinder housing a turbine for capturing the compressed air. As the turbine rotates due to airflow, it engages at least one alternator to generate electricity. The at least one alternator is then connected to the EV's batteries or other vehicle systems for charging or immediate use.

The invention relates to a generator for a wind turbine including a housing of substantially cuboidal form within which is mounted a stator. The stator has one or more multi-phase windings and a bus ring is provided for conveying electrical power from the windings to power take-off modules. One end of the power take-off modules is connected to the bus ring, and the other end of the modules has a plurality of power take-off interfaces for connection to power take-off cables. The distal ends of the power take-off modules are located in the corners of the cuboidal generator housing.

Carts with aerofoils move around an elongated, looped track under the force of the wind. Carts are connected to each other in a train on the windward side of the track and collectively rotate gear wheels at the side of the track, via racks mounted on the carts that engage with the gears. The gears ultimately power an electrical generator mounted in the base of the system. The system has multiple tracks stacked one above the other and mounted on a rotatable structure that can be turned to optimize wind energy harvesting. The angle of the aerofoils is adjusted at different locations of the cart on the track when desired. Intervening buffer carts without aerofoils are used to space the carts with aerofoils. The speed of the carts is a fraction of the wind speed.

A transportation vehicle may be equipped with electrical energy harvesting systems to harvest electrical energy for use. By way of example, in the transportation vehicle, a Venturi system may be used to receive an air flow and the speed of the air flow increase in a constricted area of the Venturi system, the air flow containing a large amount of kinetic energy. A plurality of electrical energy harvesting systems is disposed in the Venturi system and is configured to convert the kinetic energy contained in the accelerated air flow into electrical energy that can be used to power on-board electronics as well as one or more on-board batteries in the transportation vehicle, as the transportation vehicle is in motion.

A generator for a direct driven wind turbine configured to convert kinetic energy of a main shaft of the wind turbine into electrical energy. The generator includes a generator rotor connectable to the main shaft of the wind turbine and a generator stator, the generator includes a generator housing on which the generator stator is arranged. The generator housing includes a front side facing towards a rotor head of the wind turbine in an installed state of the generator and a rear side facing away from the rotor head in the installed state of the generator. The generator includes at least one front generator bearing arranged at the front of the generator housing and a rear generator bearing arranged at the rear of the generator housing.