The motor includes a shaft, a cartridge including a plurality of bearings that support the shaft, and a sleeve that surrounds the bearings, and a housing including a bottom portion for receiving an impact from outside and an attaching portion provided in the bottom portion. The bottom portion of the housing extends in a direction intersecting with respect to a longitudinal direction of the shaft, and the cartridge is removably attached to the attaching portion.

A rotor bearing assembly for an underwater generator of a fluid flow power plant includes a hollow cylindrical bearing carrier configured to be inserted into an interior of a rotor and releasably connected to the rotor such that they rotate together and an axle journal extending into an interior of the bearing carrier and rotatably supporting the bearing carrier. The bearing the axle journal and the bearing carrier are configured as an installation unit such that a portion of the bearing carrier is insertable into the rotor interior and removable from the rotor interior while attached to the axle journal. Also a generator including the rotor bearing assembly.

A motor including a rotating portion that is rotatable about a center axis that extends vertically and a stationary portion that rotatably supports the rotating portion. The stationary portion includes a stator facing at least a portion of the rotating portion in a radial direction, a base disposed axially below the stator, and a resin portion covering at least a portion of the stator, connecting the stator and the base. The base includes a recessed portion that is recessed downward in an axial direction and that accommodates at least a portion of the resin portion. The recessed portion includes an inner peripheral surface provided with an upper wall portion disposed axially above a portion of the resin portion.

A rotor of a motor includes a cylindrical portion, a first plate portion, a second plate portion, and a side hole. The cylindrical portion is arranged on a radially outer side with respect to the stator and extends in the axial direction. The first plate portion is arranged on a first axial side with respect to the stator, and expands radially inward from a first axial end of the cylindrical portion. The second plate portion is arranged on a second axial side with respect to the stator, and expands radially inward from a second axial end of the cylindrical portion. The side hole penetrates the cylindrical portion in a radial direction. The stator holder has a holder through-hole. The holder through-hole is arranged on the radially inner side with respect to the stator and penetrates the stator holder in the axial direction.

A motor assembly includes a rolling bearing installed on a rotation shaft between an impeller and a rotor to support a first support of the rotation shaft, and a motor housing having a stator. The motor housing has a gas bearing bracket for accommodating a second support of the rotation shaft disposed at a side opposite to the first support with respect to the rotor. The motor assembly includes a gas bearing assembly in the gas bearing bracket to support rotation of the second support of the rotation shaft. The gas bearing assembly includes a gas bearing for surrounding the second support. The gas bearing is spaced apart from the second support of the rotation shaft to define a gap therebetween when the rotation shaft rotates. The gas bearing assembly includes an elastic member interposed between the gas bearing bracket and the gas bearing to elastically support the gas bearing.

A brushless DC motor (BLDC) includes a stator having a ring-shaped body with multiple stator posts extending axially outward from the ring-shaped body. A plurality of stator windings are each wound about a corresponding one of the stator posts. A rotor support structure is positioned radially inward of the multiple stator posts. A rotor including a shaft is received in the rotor support structure. A first rotor disk is fixed to a first end of the shaft. At least a first set of magnets is disposed about the rotor disk and positioned radially adjacent to the stator posts such that the first set of magnets and the stator windings define a first radial flux flowpath. A second set of magnets positioned relative to the stator posts in one of an axial adjacency or a radial adjacency such that a second flux flowpath is defined.

A driving apparatus includes an output shaft, a driving motor, and a speed-reducer. The driving motor includes a stator having an annular shape, and a rotor having an annular shape. The rotor is disposed radially inward of the stator. The speed-reducer is disposed radially inward of the driving motor. The speed-reducer is configured to reduce the speed of rotation output from the rotor and transmit a rotary driving force of the rotor to the output shalt.

A brushless direct-current (BLDC) motor is provided including: a stator including a stator core having an aperture extending therethrough and a series of stator windings; and a rotor including a rotor core having a substantially cylindrical body, permanent magnets secured to an inner surface of the rotor core, a rotor shaft extending through the stator, and an overmold structure. The overmold structure includes: a radially body extending adjacent an axial end of the stator and coupled to the rotor shaft via a bushing, and a peripheral body formed around an outer surface and axial end surfaces of the rotor core and structurally securing the permanent magnets to the inner surface of the rotor core.

A drone motor includes a housing, a punching plate, a rotor, and a stator. The housing includes a top plate provided with an opening. The punching plate is attached to the top plate so as to cover the opening. The rotor is rotatably disposed inside the housing. The stator is non-rotatably disposed inside the housing.

A high performance rotating electrical machine which aims at downsizing, and challenges inevitable technical problems such as deterioration of efficiency η caused by copper loss and temperature rise inside the rotating electrical machine due to heat generation induced by eddy current generated in magnetic body.