An electrical machine comprises a stator (11) having a plurality of windings (25) and a rotor (19) having a plurality of permanent magnets (26) arranged to rotate around the windings (25), the magnets (25) being mounted to an outer portion (23) of a rotor body (20), the rotor body (20) further having an inner hub portion (21) and a plurality of circumferentially-spaced arms (22) which extend radially from the hub portion (21) to the outer portion (23) of the body (20), at least one of the arms (22) comprising a vane (24) which causes an axial airflow as the rotor rotates. The axial airflow flows over the windings (25) and helps to prevent overheating without the need for any additional cooling. Since the cooling is conveniently provided by part of the rotor, the machine the machine is simple and compact.

An electrical machine comprises a stator (11) having a plurality of windings (25) and a rotor (19) having a plurality of permanent magnets (26) arranged to rotate around the windings (25), the magnets (25) being mounted to an outer portion (23) of a rotor body (20), the rotor body (20) further having an inner hub portion (21) and a plurality of circumferentially-spaced arms (22) which extend radially from the hub portion (21) to the outer portion (23) of the body (20), at least one of the arms (22) comprising a vane (24) which causes an axial airflow as the rotor rotates. The axial airflow flows over the windings (25) and helps to prevent overheating without the need for any additional cooling. Since the cooling is conveniently provided by part of the rotor, the machine the machine is simple and compact.

A lubricant supported electric motor includes an outer stator and an inner stator each extending around an axis in radially spaced relationship with one another. A rotor is rotatably disposed between the inner and outer stators to define an inner gap extending radially between the rotor and the inner stator and an outer gap extending radially between the rotor and the outer stator. A lubricant is disposed in both of the inner and outer gaps for supporting the rotor radially between the inner and outer stators. The lubricant supported motor with a two-sided radial flux configuration results in improved rotor-to-stator system stiffness to allow the lubricant supported electric motor to be used in high shock and high vibration environments, while also providing high torque in a small and lightweight design package.

A motor includes a rotor which is rotatable with a central axis that extends vertically as a center and in which a rotor magnet is disposed; a stator which faces the rotor in a radial direction; and a position detection part which is located on one side of an axial direction of the rotor magnet and which detects a magnetic flux of the rotor magnet, wherein in the rotor magnet, magnetization regions magnetized with different polarities are alternately disposed in a circumferential direction, and the rotor includes a shield member which faces, in an axial direction, a part of the rotor magnet on the one side of the axial direction.

A stator laminated core for receiving at least one coil unit of a stator segment of a stator of a generator, in particular a segmented stator of a segmented generator, for a wind turbine, comprises at least one stator lamination stack with two or more lamination stack units which are disposed spaced apart from one another in a circumferential direction and have a plurality of first stator lamination elements which are disposed next to one another, in particular stacked, in an axial direction; wherein the at least one stator lamination stack comprises at least one second stator lamination element, preferably two second stator lamination elements, which is different from the first stator lamination element and in each case connects adjacent lamination stack units of the two or more lamination stack units to one another.

A stator laminated core for receiving at least one coil unit of a stator segment of a stator of a generator, in particular a segmented stator of a segmented generator, for a wind turbine, comprises at least one stator lamination stack with two or more lamination stack units which are disposed spaced apart from one another in a circumferential direction and have a plurality of first stator lamination elements which are disposed next to one another, in particular stacked, in an axial direction; wherein the at least one stator lamination stack comprises at least one second stator lamination element, preferably two second stator lamination elements, which is different from the first stator lamination element and in each case connects adjacent lamination stack units of the two or more lamination stack units to one another.

A rotating electrical machine equipped with a magnet unit and a magnetic body. The magnet unit is also equipped with magnet covers wrapped about armature-facing peripheral surfaces of the magnets. Each of the magnets has recesses formed in portions of the armature-facing peripheral surface which are located close to q-axes each of which lies at a boundary between magnetic poles. Each of the magnet covers is recessed in the radial direction in accordance with the shape of the magnet recesses. If the armature-facing peripheral surface of the magnets is between a circumferentially adjacent two of the magnet recesses is defined as a main magnetic pole surface, and an angle representing a circumferential range occupied by the main magnetic pole surface is defined as a main magnetic pole angle ?a, the main magnetic pole angle ?a is selected to be 2?/5<?a<2?/3.

A rotating electrical machine equipped with a magnet unit and a magnetic body. The magnet unit is also equipped with magnet covers wrapped about armature-facing peripheral surfaces of the magnets. Each of the magnets has recesses formed in portions of the armature-facing peripheral surface which are located close to q-axes each of which lies at a boundary between magnetic poles. Each of the magnet covers is recessed in the radial direction in accordance with the shape of the magnet recesses. If the armature-facing peripheral surface of the magnets is between a circumferentially adjacent two of the magnet recesses is defined as a main magnetic pole surface, and an angle representing a circumferential range occupied by the main magnetic pole surface is defined as a main magnetic pole angle ?a, the main magnetic pole angle ?a is selected to be 2?/5<?a<2?/3.

A motor includes a rotor molded by resin casting, and a stator disposed inside the rotor. The rotor includes a cylindrical portion in which a plurality of magnets are arranged side by side in a circumferential direction. The magnets are exposed on a side of an open end as one end of the cylindrical portion in an axial direction of the cylindrical portion. The cylindrical portion includes an inner resin located inside each of the magnets in a radial direction of the cylindrical portion. The inner resin includes a first resin portion, and a second resin portion closer to the open end than the first resin portion in the axial direction. A sectional area of the second resin portion perpendicular to the axial direction is smaller than a sectional area of the first resin portion perpendicular to the axial direction.

A motor includes a rotor molded by resin casting, and a stator disposed inside the rotor. The rotor includes a cylindrical portion in which a plurality of magnets are arranged side by side in a circumferential direction. The magnets are exposed on a side of an open end as one end of the cylindrical portion in an axial direction of the cylindrical portion. The cylindrical portion includes an inner resin located inside each of the magnets in a radial direction of the cylindrical portion. The inner resin includes a first resin portion, and a second resin portion closer to the open end than the first resin portion in the axial direction. A sectional area of the second resin portion perpendicular to the axial direction is smaller than a sectional area of the first resin portion perpendicular to the axial direction.