A hydrogen recirculation blower is used in a hydrogen return arrangement in a fuel cell system. The blower includes a rotatable rotor with an end region on which an impeller is arranged, and a stator with coil windings and with a hydrogen barrier which is formed as a hollow body. The rotor is arranged in a cavity of the hydrogen barrier, with the hydrogen barrier running both between the rotor and the coil windings and between the impeller and the coil windings. The rotor and the stator form an electric motor for driving the impeller.

The invention relates to an electrical machine comprising a stator and a rotor that are disposed in a casing comprising a first face provided with ribs and intended to be in contact with a cooling fluid, the machine being provided with a closing structure which is fastened in a leaktight manner to the first face of the casing so as to delimit with the first face of the casing a space forming a circuit for the cooling fluid of the motor, the closing structure being fastened to the first face of the casing by welding and/or brazing and/or crimping and comprising at least one cover, characterized in that the closing structure is fastened to the casing by welding and/or brazing and/or crimping only at said ribs.

The invention relates to an electrical machine comprising a stator and a rotor that are disposed in a casing comprising a first face provided with ribs and intended to be in contact with a cooling fluid, the machine being provided with a closing structure which is fastened in a leaktight manner to the first face of the casing so as to delimit with the first face of the casing a space forming a circuit for the cooling fluid of the motor, the closing structure being fastened to the first face of the casing by welding and/or brazing and/or crimping and comprising at least one cover, characterized in that the closing structure is fastened to the casing by welding and/or brazing and/or crimping only at said ribs.

A motor includes a stator having a winding, and a rotor. The rotor rotates by receiving a rotational magnetic field generated by drive current supplied to the winding. The winding includes a first winding and a second winding, the first and second windings both being excited at the same timing by the drive current. The first winding and the second winding are connected in series. The rotor includes a first pole section and a second pole section. The second pole section faces the second winding at the rotation position of the rotor at which the first pole section faces the first winding. The magnetic force exerted on the stator by the second pole section is weaker than that exerted by the first pole section.

A method for manufacturing a shaft (1) in which linking members (3) are provided to ends of a cylindrical member (2) including: polishing end surfaces of a metal sheet; a bending step for bending the metal sheet into a cylindrical or arcuate shape; butting together the polished end surfaces of the metal sheet, the end surfaces facing each other in a state in which the metal sheet has been bent into the cylindrical shape, or disposing a plurality of the metal sheets that are bent into an arcuate shape so as to form a cylindrical shape and butting together the polished end surfaces of the metal sheets, and then heating the butted portions so that the butted portions are diffusion-joined, thereby forming the cylindrical member (2); cooling the post-diffusion-joining-step cylindrical member (2); and joining the linking members (3) to the ends of the cylindrical member (2).

Electrical generators having one or more conformal support and cooling devices for use in supporting and cooling rotating elements of the generator are disclosed herein. An electrical generator includes a housing, a shaft disposed axially through the housing, a rotor assembly including a plurality of poles that are disposed within the housing and mounted on the shaft, a support wedge disposed between two of the plurality of poles. The conformal support and cooling device includes an internal cooling channel in a helical configuration or a V-shape configuration that extends from a first length-wise end of the support and cooling device to a second length-wise end of the support and cooling device. Additive manufacturing processes are employed to fabricate the conformal support and cooling device.

Electrical generators having one or more conformal support and cooling devices for use in supporting and cooling rotating elements of the generator are disclosed herein. An electrical generator includes a housing, a shaft disposed axially through the housing, a rotor assembly including a plurality of poles that are disposed within the housing and mounted on the shaft, a support wedge disposed between two of the plurality of poles. The conformal support and cooling device includes an internal cooling channel in a helical configuration or a V-shape configuration that extends from a first length-wise end of the support and cooling device to a second length-wise end of the support and cooling device. Additive manufacturing processes are employed to fabricate the conformal support and cooling device.

A housing for an electric machine includes a substantially cup-shaped outer housing having a first base portion and a first tubular portion adjoining the base portion. An inner housing, which has a substantially cup-shaped form, is arranged in the outer housing and has a second base portion and a second tubular portion adjoining the base portion. A cover is connected or connectable to the outer housing and/or the inner housing. At least one cooling channel is formed between the first tubular portion and the second tubular portion. A pocket is formed in the first base portion and forms a first cavity together with the second base portion, and a second cavity is formed in the cover. The first cavity is fluidically connected to the cooling channel via a first bore and the second cavity is fluidically connected to the cooling channel via a second bore.

A motor having a rotor connected to an input shaft and a stator fixed by a fixing jig during assembly to a case includes: a stator convex part that extends radially outward from an outer circumference of the stator and positions the stator with respect to the case; and a case convex part that extends radially inward from an inner circumference of the case and is arranged so as to overlap with the stator convex part in a circumferential direction. A relief part is provided between the stator convex part and the case convex part, the relief part being arranged such that the stator convex part can be rotated along the circumferential direction with respect to the case during assembly.

A motor having a rotor connected to an input shaft and a stator fixed by a fixing jig during assembly to a case includes: a stator convex part that extends radially outward from an outer circumference of the stator and positions the stator with respect to the case; and a case convex part that extends radially inward from an inner circumference of the case and is arranged so as to overlap with the stator convex part in a circumferential direction. A relief part is provided between the stator convex part and the case convex part, the relief part being arranged such that the stator convex part can be rotated along the circumferential direction with respect to the case during assembly.