A power tool is provided including a tool housing including a motor housing and a handle portion; a battery receptacle disposed at an end of the handle portion opposite the motor housing, the battery receptacle being configured to receive a battery pack having a maximum voltage of at least 60 V; and a brushless DC (BLDC) motor including an electronically-commutated stator assembly and a rotor assembly magnetically interacting with the rotor assembly to rotate with respect to the stator assembly, the stator assembly comprising a stator lamination stack sized to be received within the motor housing having a circumference of approximately 140 to approximately 190 mm. The motor produces a maximum power output of at least 1600 watts for driving an output shaft at a maximum torque of at least 30 inch-pounds and a maximum speed of at least 8000 rotations-per-minute.

An engine component cooling system and apparatus, at least one fan and a cover are installed upon the engine component. The fan pulls cool air and force cool air through the component assembly to reduce the heat generated through operation, thereby optimizing operation and extending the useful life of the individual components and the assembly. In one example, a fan and a cover are installed on an alternator assembly so that the fan draws in and forces cool air through the rectifier, rotor, stator, and out through the front of the assembly. The cover prevents cool air from being lost and misdirected, while directing the cool air through the assembly.

An engine component cooling system and apparatus, at least one fan and a cover are installed upon the engine component. The fan pulls cool air and force cool air through the component assembly to reduce the heat generated through operation, thereby optimizing operation and extending the useful life of the individual components and the assembly. In one example, a fan and a cover are installed on an alternator assembly so that the fan draws in and forces cool air through the rectifier, rotor, stator, and out through the front of the assembly. The cover prevents cool air from being lost and misdirected, while directing the cool air through the assembly.

Provided is an engine generator with improved accessibility to an operation panel. An engine generator includes: a casing; a generator; and an engine that drives the generator, the generator and the engine being housed in the casing, wherein a plurality of panels each having a predetermined dimension are respectively removably provided at side surfaces of the casing, and any selected one of the plurality of panels can be exchanged for a console for the engine generator.

Provided is an engine generator with improved accessibility to an operation panel. An engine generator includes: a casing; a generator; and an engine that drives the generator, the generator and the engine being housed in the casing, wherein a plurality of panels each having a predetermined dimension are respectively removably provided at side surfaces of the casing, and any selected one of the plurality of panels can be exchanged for a console for the engine generator.

An actuator utilizes a voice coil motor with one or more voice coil windings supported on a light weight moveable bobbin that connects at one end to move an object rapidly up to a small number of millimeters translationally along a system axis. The bobbin moves over a distal portion of a center pole of a stator, which supports the voice coil motor magnets. The pole, which acts as a flux path for the voice coil motor, also provides a thin film of air in a gap between the pole and the bobbin via an air path and corresponding holes at the distal end of the pole. The bobbin moves translationally relative to the pole on the thin film of air under the control of the voice coil motor.

In a rotary electric machine, first inclined surfaces that intersect a plane that includes a central axis of a shaft at a predetermined angle are disposed radially outside gaps between coil ends of circumferentially adjacent concentrated winding coils, and cooling air that is blown out from a cooling fan and has flowed radially outward through the gaps between the coil ends is converted into an axially outward flow by the first inclined surfaces.

An adaptor is disclosed for connecting a rotating electrical machine 12 to a prime mover 10. The adaptor comprises at least one air outlet. The adaptor is arranged to provide an increase in a cross-sectional area of air flow towards the outlet. In this way part of the dynamic pressure can be converted into additional static pressure rise through steady expansion of the air flow cross-section. This in turn may help to improve the overall amount of cooling air passing through the machine for a given fan input power.

The disclosure relates to a generator and a wind turbine. The generator includes an active cooling loop and a passive cooling loop that are isolated from each other and both are in communication with external environment. The active cooling loop includes cavities that are in communication with each other and located at two respective ends of the generator in an axial direction, an air gap between a rotor and a stator of the generator, and radial channels arranged at intervals and distributed along the axial direction of the stator. A cooling device in communication with the external environment is disposed in the active cooling loop. The passive cooling loop includes an axial channel extending through the stator in the axial direction and an outer surface of the generator.

The disclosure relates to a generator and a wind turbine. The generator includes an active cooling loop and a passive cooling loop that are isolated from each other and both are in communication with external environment. The active cooling loop includes cavities that are in communication with each other and located at two respective ends of the generator in an axial direction, an air gap between a rotor and a stator of the generator, and radial channels arranged at intervals and distributed along the axial direction of the stator. A cooling device in communication with the external environment is disposed in the active cooling loop. The passive cooling loop includes an axial channel extending through the stator in the axial direction and an outer surface of the generator.