A magnetic pole piece device, which is disposed between an inner diameter side magnet field and an outer diameter side magnet field of a magnetic gear, includes a plurality of magnetic pole pieces disposed at intervals in a circumferential direction of the magnetic gear. Each of the plurality of magnetic pole pieces includes a plurality of plate-shaped electrical steel sheets having a longitudinal direction. The plurality of electrical steel sheets are laminated along the circumferential direction, with the longitudinal direction being along an axial direction of the magnetic gear.

An electric machine includes a housing, a stator, an oil film, and at least one first seal. The housing has an internal surface defining an internal cavity. The stator has an outer peripheral surface and is disposed within the internal cavity such that a clearance gap is defined between an outer peripheral surface and the internal surface. The oil film is disposed within the clearance gap and is in contact with the internal surface and the outer peripheral surface. The at least one first seal is disposed along a first end of the stator and is configured to retain the oil film within the clearance gap along the first end of the stator.

A hydraulic assembly of a traction control system of a hydraulic vehicle brake system includes a hydraulic block, a motor block, and a control device. The hydraulic block includes at least one electric hydraulic valve and at least one electric hydraulic pump arranged therein. The motor block includes an electric motor arranged therein. The electric motor is configured to drive the at least one hydraulic pump. The control device is configured to control the at least one hydraulic valve, the at least one hydraulic pump, and the electric motor. The control device has two structurally separate control units, which include a first control unit with signal components and a second control unit with power components.

A structure for sealing an electric motor so that it is not affected by the humidity from the environment it is placed in, while at the same time the heat generated within the structure is removed into the environment preventing long term motor damage.

In an electric power steering device, a motor housing includes an end face part opposite to an output part of a rotating shaft of an electric motor. A power conversion circuit part includes a power conversion switching circuit part, and a second part exclusive of the power conversion switching circuit part. The power conversion switching circuit part includes an upper arm switching element and a lower arm switching element packaged by synthetic resin, and is mounted on a power conversion switching circuit board that is mounted to a power conversion switching circuit part heat dissipation section of the end face part for heat dissipation. A power supply circuit part and the second part of the power conversion circuit part are mounted on a power supply circuit board that is mounted to a power supply circuit part heat dissipation section of the end face part for heat dissipation.

A motor assembly can include a motor shaft, a stator assembly, and a rotor assembly, and can include a cooling jacket. The cooling jacket can include an inner wall facing radially inwardly towards the stator assembly and an opposite outer wall facing radially outwardly, a circumferential internal fluid passageway for allowing a cooling fluid to be pumped through an interior of the cooling jacket, the internal fluid passageway being disposed between the inner and outer walls and extending between an inlet and an outlet, a mounting pad receiving, at an opening in the outer wall, a heat generating component associated with the motor assembly, the opening being in fluid communication with the internal fluid passageway such that the cooling fluid can provide cooling to the heat generating component.

Provided is a stator assembly comprising a stator including a stator core having a cylindrical shape and a through hole through which two ends communicate with an outside and a wound coil having parts protruding to the outside further than the two ends of the stator core in an axial direction of the stator core and the remaining part positioned in the stator core and heat dissipation caps which are provided on two end portions of the stator core such that the protruding parts of the wound coil are accommodated in contact with an outer surface of the stator core. Therefore, a heat radiation path capable of transferring heat generated by or transferred to a stator coil to the outside increases, heat dissipation efficiency is improved, heat dissipation properties are superior, and thus a decrease in operational efficiency of a motor due to heat generation may be minimized or prevented.

A fluid moving apparatus includes an electric motor having a rotor and a stator and a propeller. The rotor rotates relative to the stator on an axis to generate a rotational output. The rotational output is provided to the propeller to power the marine propulsion apparatus. The stator includes one or more coils configured to power rotation of the rotor. The one or more coils extend circumferentially around and can be coaxial on the axis. A portion of a housing of the motor extends into the aquatic environment to facilitate heat dissipation.

A planar member for a stator stack comprises a stator yoke defining a central longitudinal axis, a first surface facing radially outward, and a second surface facing radially inward, a tooth extending radially inwards from the second surface, a first tooth tip extending circumferentially from a radially inward end of the tooth, a second tooth tip extending circumferentially from the radially inward end of the tooth, a first slot portion defined between the first tooth tip and the second surface, a second slot portion defined between the second tooth tip and the second surface, and a slot cooling fin extending radially from the stator yoke into the first slot portion.

Provided are an electronic drive device and an electronic steering device, in each of which: a mounting substrate has one surface as a first surface on which a first heat generating component is mounted and the other surface as a second surface on which a second heat generating component is mounted; a first heat dissipation member is arranged in contact with the second surface at a position corresponding to a mounted position of the first heat generating component such that heat generated by the first heat generating component is dissipated to a motor housing; and a second heat dissipation member is arranged in contact with the first surface at a position corresponding to a mounted position of the second heat generating component such that heat generated by the second heat generating component is dissipated to a cover.