An electric generator may include a housing having a housing casing running around in a circumferential direction and front and rear side walls, a radially outer stator rotatably arranged on the housing about an axis of rotation, and a radially inner rotor arranged on the housing in a rotationally fixed manner. The generator may also have an axially outer impeller wheel arranged on an outer side of the front side wall and arranged in a rotationally fixed fashion on the rotor. The generator may further have a primary air inlet having inlet openings formed in the rear side wall, a secondary air inlet having secondary inlet openings formed in the housing casing, an air outlet having a plurality of outlet openings formed in the front side wall, a primary air path from the primary air inlet to the air outlet, and a secondary air path from the secondary air inlet to the air outlet. During operation, the impeller wheel may rotate with the rotor and generate a partial vacuum that generates a primary air flow, which enters the primary air inlet, follows the primary air path, and exits through the air outlet, and a secondary air flow, which enters through the secondary air inlet, follows the secondary air path, and exits through the air outlet.

An electronic package connectable to an electric machine includes a cooling tower having a metallic wall with a radially outer wall surface. The radially outer wall surface includes discrete, radially outwardly projecting pedestals. The planar pedestal mounting surfaces are parallel with the central axis such that the radial distance between the axis and the radially outer wall surface is greater within the periphery than outside the periphery. Power modules are mounted to the pedestals. Each power module includes a base in thermal contact with a pedestal mounting surface and an opposing interior surface in thermal communication with a MOSFET power electronics device. A cover plate is spaced from the base interior surface. A dielectric housing member surrounds the MOSFET power electronics devices. An electrical connection terminal is disposed outside the periphery of each module. An electric machine including such an electronic package is also disclosed.

An active rectifier of a rotary electric machine, in particular an active rectifier for alternators, for example for rectifying alternating currents (AC) to direct currents (DC) for charging batteries on vehicles, is disclosed. The active rectifier may include a plurality of power MOSFET transistors and a detecting and driving circuitry all mounted on a single substrate to form a half-bridge module. A number of at least two and up to N modules may be connected together to serve as a two and up to N-phase rectifier. Each module is connected in a way to rectify currents from one phase of the electric machine and has an individual power supply for the detecting and driving circuitry. The power supply may receive the power from the phase which is being rectified and operates independently of the alternator's voltage regulator.

An modular apparatus for generating electrical power in a borehole penetrating the earth includes a body comprising first and second mechanical connectors at opposing ends and first and second electrical connectors at the opposing ends, the mechanical connectors and the electrical connectors being configured to connect with the same type of corresponding connectors on another modular apparatus when the modular apparatus and the another modular apparatus are stacked together. The modular apparatus further includes: an electrical generator having a rotor and stator in mechanical communication with the first and second mechanical connectors and in electrical communication with the first and second electrical connectors; and a turbine wheel coupled to or integrated with the rotor and comprising one or more turbine blades that are configured to interact with fluid flowing through the borehole causing the turbine wheel to rotate and the rotor to rotate in order to generate the electrical power.

The semiconductor device has a first external electrode having an outer peripheral section, which has a circular shape in top plan view and which is to be attached to an alternator. On the first external electrode there mounted: a MOSFET chip; a control circuitry to which voltages at or a current flowing between a first main terminal and a second main terminal of the MOSFET chip is inputted and which generates, on the basis of the voltages or the current, a control signal applied to a gate of the MOSFET chip; and a capacitor for providing a power supply to the control circuitry. The semiconductor device further has a second external electrode disposed opposite to the first external electrode with respect to the MOSFET chip. An electrical connection is made between the first main terminal of the MOSFET chip and the first external electrode, and between the second main terminal of the MOSFET chip and the second external electrode.

A generator assembly for harvesting energy in a bearing arrangement having a first ring and a second ring is provided. The generator assembly includes a plurality of coils attached to the first ring and configured to interact with a magnet ring with alternating magnetization directions attached to the second ring, and a plug connector for supplying power generated by the generator assembly to external devices. The first ring is an outer ring of the bearing, the groove is formed on an outer circumference of the first ring and is helicoidally shaped, and a helix angle of the groove is 45 or more.

A system-specific interface module for a motor control subassembly for controlling operation of an electric motor within a larger system which uses a particular system communication method. The motor control subassembly includes a standard power module and the interface module. The power module includes a controller processor configured to receive input for controlling and to generate output regarding operation of the motor. The interface module includes a communication interface hardware block configured to exchange input and output signals with the larger system, and an interface processor configured to translate the input and output signals between the particular system communication method used by the larger system and a standard internal communication method used by the power module. Thus, the motor control subassembly can be configured to accommodate any of a variety of different system communication methods and other input/output options by selecting and inserting the appropriate interface module.

A stator defines multiple stator poles with associated stator windings. A rotor defines multiple rotor poles with associated rotor windings configured to be energized substantially by the stator. The rotor defines a rotor field energizable by magnetic fields produced by the stator windings to produce relative force between the rotor and the stator. An active rectifier is conductively coupled to one or more first rotor windings. The active rectifier is configured to control a direction of current flow through the one or more first rotor windings responsive to a signal received wirelessly from the stator by one or more second rotor windings.

A stator defines multiple stator poles with associated stator windings. A rotor defines multiple rotor poles with associated rotor windings configured to be energized substantially by the stator. The rotor defines a rotor field energizable by magnetic fields produced by the stator windings to produce relative force between the rotor and the stator. An active rectifier is conductively coupled to one or more first rotor windings. The active rectifier is configured to control a direction of current flow through the one or more first rotor windings responsive to a signal received wirelessly from the stator by one or more second rotor windings.

Provided are a semiconductor device realized easily at low cost without requiring a complicated manufacturing process, and an alternator using the same. The semiconductor device includes a base having a base seat, a lead having a lead header, and an electronic circuit body, wherein the electronic circuit body is arranged between the base and the lead; the base seat is connected to a first surface of the electronic circuit body; the lead header is connected to a second surface of the electronic circuit body; the electronic circuit body is integrally covered by resin, including a transistor circuit chip having a switching element, a control circuit chip for controlling the switching element, a drain frame, and a source frame; either one of the drain frame and the source frame, and the base are connected; and the other one of the drain frame and the source frame, and the lead are connected.