A motor apparatus includes a casing, a stator disposed in the casing, a rotor disposed on an inner circumference of the stator, a shaft disposed on an inner circumference of the rotor, a functional part disposed on an outer circumference of a first member, and a heat-resistant part disposed between the functional part and a second member. The first member is the stator or the shaft. The second member is the casing or the rotor.

A housing for an electric machine includes a cooling device arranged on the periphery of a support plate, the cooling device contacts a heat-conducting ring connected to the housing, and the support plate as well as components arranged thereon have vibration damping and an electric insulation to provide advantageous structural conditions such that an advantageous cooling effect is achieved, and regions within the cooling device can be provided for fitting elements of the support plate.

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 stator for an electric machine comprises a cylindrical core defining an inner cylindrical surface and an outer cylindrical surface with a plurality of slots formed between the inner cylindrical surface and the outer cylindrical surface. Windings are positioned on the cylindrical core. The leads of the windings include a plurality of inner leads associated with conductors in an inner layer of the slots and a plurality of outer leads associated with conductors in an outer layer of the slots. A bus bar assembly includes a plurality of inner bus bars and a plurality of outer bus bars, the plurality of inner bus bars connected to the plurality of inner leads, and the plurality of outer bus bars connected to the plurality of outer leads. The plurality of outer bus bars are positioned radially outward from the end turns of the windings and radially inward from the outer cylindrical surface.

An electric work machine in one aspect of the present disclosure includes an electric power input terminal, a motor, a circuit board, a first heat dissipation plate, and a second heat dissipation plate. The circuit board includes a first surface and an electronic circuit on the first surface. The electronic circuit controls supply of AC power to the motor. The electronic circuit includes an electronic component that generates Joule heat. The first heat dissipation plate is spaced from the first surface by a first distance in parallel to the first surface. The second heat dissipation plate is spaced from the first surface by a second distance in parallel to the first surface. The second heat dissipation plate is thermally coupled with the first heat dissipation plate. The second distance is smaller than the first distance.

An electric machine includes a stator comprising a plurality of stator teeth, a winding disposed on each stator tooth of the plurality of stator teeth, a heat sink mounted in thermal contact with an end winding of each winding and comprising a plurality of microchannels, a heat-transfer fluid disposed within the plurality of microchannels, and a condenser configured to exchange heat with the heat sink.

A motor controller includes a housing, a power circuit board, and a control circuit board. The housing includes a first mounting platform, a second mounting platform, and a side wall. There is a height difference between the first mounting platform and the second mounting platform. The first mounting platform is disposed on an upper part of the side wall, and the second mounting platform is disposed on a middle part of the side wall. The second mounting platform is disposed on one side of the first mounting platform. The first mounting platform and the side wall form an upper chamber, and the control circuit board and the power circuit board are disposed in the upper chamber. The control circuit board is closer to the first mounting platform than the power circuit board. The second mounting platform and the side wall form a lower chamber communicating with the upper chamber.

An actuator comprises a coil, a first cooling plate and a second cooling plate. The cooling plates are configured to cool the coil. The first and second cooling plates are arranged at opposite sides of the coil to be in thermal contact with the coil. The coil comprises a first coil part and a second coil part, the first coil part facing the first cooling plate and the second coil part facing the second cooling plate, the first and second coil parts being separated by a spacing there between. The first cooling plate, the first coil part, the spacing, the second coil part and the second cooling plate form a stacked structure whereby the coil parts are arranged between the cooling plates and the spacing is arranged between the coil parts. The actuator further comprises a filling element arranged in the spacing. The filling element to push the first coil part towards the first cooling plate and to push the second coil part towards the second cooling plate.

An electric motor includes a shaft that is rotatably supported for rotation around a rotation axis, a rotor that is located outwardly of the shaft in a radial direction and rotates integrally with the shaft, a stator that faces the rotor in the radial direction, and a tubular frame that has an inner peripheral surface to which the stator is fixed. The electric motor further includes a groove included in (i) the inner peripheral surface of the frame or (ii) an outer peripheral surface of the stator, and an insulating member disposed in the groove.

Provided is a magnetic-geared motor that can suppress eddy current flowing inside a fastening member and reduce power loss. The magnetic-geared motor includes: a stator; a first rotor provided rotatably relative to the stator and including a plurality of magnetic pole pieces and a plurality of spacers disposed so as to be arranged in a circumferential direction; and a second rotor provided coaxially with the first rotor. Each spacer is composed of a plurality of divisional spacers disposed apart from each other in an axial direction, and a plurality of fastening tools for fastening the plurality of divisional spacers in the axial direction, and the divisional spacers and the fastening tools are electrically insulated from each other.