An outer-rotor brushless direct-current motor is provided. The motor includes a motor can that supports the motor components and a fan mounted on a rotor shaft inside the motor can to generate an airflow through the motor can. The motor can includes exhaust openings formed around the fan to allow the airflow to be expelled radially away from the fan, and intake openings formed at a distance from the exhaust openings to allow an airstream to be received radially into the motor can.

A permanent magnet rotor (100) for an electric motor comprises a bell housing (110) comprising an annular wall (112) and at least one permanent magnet (120) fixed to the annular wall by adhesive means (126) sited between a rear face (124) and the annular wall (112). The rear face (124) of the permanent magnet (120) has a receiving zone (134) accepting said adhesive means (126) and defined by a radius of curvature (R′, R2) which is greater than the radius of curvature (R) of the annular wall (112).

A permanent magnet rotor (100) for an electric motor comprises a bell housing (110) comprising an annular wall (112) and at least one permanent magnet (120) fixed to the annular wall by adhesive means (126) sited between a rear face (124) and the annular wall (112). The rear face (124) of the permanent magnet (120) has a receiving zone (134) accepting said adhesive means (126) and defined by a radius of curvature (R′, R2) which is greater than the radius of curvature (R) of the annular wall (112).

An in-wheel motor is disclosed including a stator and a rotor arranged around the stator, the stator including a cylindrical surface and coils with windings around axially oriented core members and including coil terminals, the motor further including a connector including at least two mutually isolated conductors arranged at the first end of the cylindrical surface near curved ends, the conductors each including a circumferential conducting body and a plurality of contact members extending from conducting the body and arranged for connecting to one of the terminals, wherein the circumferential conducting bodies are axially spaced apart from each other.

An electromagnetic propulsion system is provided. The system comprises first and second pluralities of stator coils wound about first and second axes, a plurality of support structures, first and second couplers that surround portions of the first and second pluralities of stator coils, and first and second pluralities of sets of rotor coils wound about axes that are parallel to the first and second axes. The stator coils are configured to receive electric current through an outside controller selecting appropriately coupled stator sections or through a sliding electrical contact system or bearing system to induce at least a first magnetic field. The plurality of support structures supports the first and second plurality of stator coils. The first and second couplers include notches and are oriented so that their notches pass over the plurality of support structures when the couplers move along the stator coils. The couplers may have an adjustable segment to close the notch. The sets of rotor coils are equidistantly attached to the couplers and are configured to receive electric current to induce magnetic fields that interact with the magnetic fields of the stator coils so that magnetic forces are applied to the plurality of rotor coils, thereby propelling the couplers along the stator coils.

The stator core is divided into an annular part and a plurality of teeth, including a tooth main part and a distal end part, having a larger circumferential width than a circumferential width of the tooth main part, and the annular part includes a plurality of fitting grooves, in the circumferential direction on an outer peripheral surface, extending in an axial direction and having a sectional shape with a narrowed part on an open side. Each of the teeth includes, at a base end part, a fitting part having a sectional shape that allows the fitting part, fitted into a fitting groove, inserted into the fitting groove of the annular part in the axial direction fitted to the annular part in an undetachable manner in a radial direction, and the fitting part has a maximum width in the circumferential direction smaller than the circumferential width of the tooth main part.

The stator core is divided into an annular part and a plurality of teeth, including a tooth main part and a distal end part, having a larger circumferential width than a circumferential width of the tooth main part, and the annular part includes a plurality of fitting grooves, in the circumferential direction on an outer peripheral surface, extending in an axial direction and having a sectional shape with a narrowed part on an open side. Each of the teeth includes, at a base end part, a fitting part having a sectional shape that allows the fitting part, fitted into a fitting groove, inserted into the fitting groove of the annular part in the axial direction fitted to the annular part in an undetachable manner in a radial direction, and the fitting part has a maximum width in the circumferential direction smaller than the circumferential width of the tooth main part.

An electric motor is provided and includes inner and outer rotors, a stator supportive of back iron radially interposed between the inner and outer rotors and a winding structure. The winding structure includes first phase coils radially interposed between the inner rotor and a first side of the back iron, the first phase coils extending axially along the first side of the back iron, second phase coils radially interposed between a second side of the back iron and the outer rotor, the second phase coils extending axially along the second side of the back iron and end windings respectively extending radially between corresponding ones of the first and second phase coils.

Aircraft electric motors are described. The aircraft electric motors include a motor unit having a rotor and a stator, wherein the stator includes a plurality of windings and cooling channels arranged to provide cooling to the plurality of windings, a drive unit configured to drive operation of the motor unit, and a cooling system. The cooling system includes an oscillating heat pipe containing a first working fluid, wherein the oscillating heat pipe is arranged to pick up heat from at least one winding, the oscillating heat pipe having an evaporator section arranged in thermal contact with the at least one winding and a condenser section arranged away from the evaporator section and a heat pickup portion arranged to receive a second working fluid to remove heat from the condenser section of the oscillating heat pipe.

Provided is a wheel bearing apparatus with a generator that can have a simplified structure to reduce costs and is capable of preventing electrolytic corrosion. The wheel bearing apparatus with a generator includes a wheel bearing and a generator. The generator includes a stator attached to a fixed wheel and a motor rotor attached to a rotating wheel and is of an outer-rotor type in which the stator is located on an outer periphery of the wheel bearing, and the motor rotor is located radially outside of the stator. The wheel bearing apparatus with the generator further includes at least one conducting unit that conducts a current between the fixed wheel and the rotating wheel.