Abstract: A rotating electrical machine includes a rotor and a stator including an annular stator core including core pieces connected to each other in a circumferential direction. Each of the core pieces includes a core back piece extending in the circumferential direction and a tooth radially extending from the core back piece. At least one of the coupling portions between the core back pieces adjacent in the circumferential direction is a first coupling portion. Each of the pair of core back pieces connected in the circumferential direction via the first coupling portion includes a first surface and a second surface continuously connected to the first surface in the radial direction. In the pair of core back pieces connected in the circumferential direction, the first surface of one core back piece and the first surface of the other core back piece are in contact with each other.

Abstract: A rotor includes a rotor core, a first magnet, a second magnet, and a holder made of resin. Both a radially inner surface and a radially outer surface of the first magnet are covered with the rotor core. The second magnet includes a radially inner surface covered with the rotor core, and a radially outer surface exposed from the rotor core. The holder includes a first inner pressing portion and a second inner pressing portion. The first inner pressing portion presses the first magnet radially outward from a radially inner side of the first magnet. The second inner pressing portion presses the second magnet radially outward from a radially inner side of the second magnet. Accordingly, the first magnet and the second magnet are accurately positioned for the rotor core.

Abstract: A stator is formed by laminating electrical steel sheets punched into a predetermined shape. The stator includes split cores that are punched out from the electrical steel sheets to have an annular shape. A first group of the split cores adjacent to each other in the circumferential direction have the same rolling direction, and a second group of the split cores adjacent to each other in the circumferential direction have different rolling directions.

Abstract: A rotor includes a shaft, a rotor core, magnets on a radial outside surface of the rotor core, and sheet-shaped magnetic portions provided on radial outside surfaces of some of the magnets. The magnets include first magnets in which the magnetic portions are on a circumferential portion in a radial outside surface of the first magnets and second magnets in which the magnetic portions are not on a radial outside surface of the second magnets. The first magnets and the second magnets are alternately arranged in the circumferential direction in each of a first portion and a second portion along the axial direction in the radial outside surface of the rotor core. The first magnets of the first portion and the second magnets of the second portion overlap each other, and the second magnets of the first portion and the first magnets of the second portion overlap each other.

Abstract: First and second sets of magnet assemblies and magnetic assemblies are alternately arranged in a circumferential direction in a first portion along an axial direction, and the first and second sets are alternately arranged in the circumferential direction in a second portion along the axial direction. When viewed in the axial direction, the first set of the first portion and the second set of the second portion overlap with each other, and the second set of the first portion and the first set of the second portion overlap with each other.

Abstract: A rotor includes a first rotating body and a second rotating body. The first rotating body includes a first rotor core and first magnets arranged in a circumferential direction. An outer side surface of the first rotating body includes first outer side surfaces curved in a circular arc shape and arranged in the circumferential direction. The first outer side surface is an outer side surface of the first magnet or an outer side surface of the first rotor core. The second rotating body is positioned on a side lower than the first rotating body in an axial direction and includes a second rotor core and second magnets arranged in the circumferential direction. An outer side surface of the second rotating body includes second outer side surfaces curved in a circular arc shape and arranged in the circumferential direction.

Abstract: A rotor includes a first rotating body and a second rotating body. The first rotating body includes a first rotor core and first magnets arranged in a circumferential direction. An outer side surface of the first rotating body includes first outer side surfaces curved in a circular arc shape and arranged in the circumferential direction. The first outer side surface is an outer side surface of the first magnet or an outer side surface of the first rotor core. The second rotating body is positioned on a side lower than the first rotating body in an axial direction and includes a second rotor core and second magnets arranged in the circumferential direction. An outer side surface of the second rotating body includes second outer side surfaces curved in a circular arc shape and arranged in the circumferential direction.

Abstract: A rotor includes a rotor core, a first magnet, a second magnet, and a holder made of resin. Both a radially inner surface and a radially outer surface of the first magnet are covered with the rotor core. The second magnet includes a radially inner surface covered with the rotor core, and a radially outer surface exposed from the rotor core. The holder includes a first inner pressing portion and a second inner pressing portion. The first inner pressing portion presses the first magnet radially outward from a radially inner side of the first magnet. The second inner pressing portion presses the second magnet radially outward from a radially inner side of the second magnet. Accordingly, the first magnet and the second magnet are accurately positioned for the rotor core.

Abstract: A stator is formed by laminating electrical steel sheets punched into a predetermined shape. The stator includes split cores that are punched out from the electrical steel sheets to have an annular shape. A first group of the split cores adjacent to each other in the circumferential direction have the same rolling direction, and a second group of the split cores adjacent to each other in the circumferential direction have different rolling directions.

Abstract: A rotor includes a shaft, a rotor core, magnets on a radial outside surface of the rotor core, and sheet-shaped magnetic portions provided on radial outside surfaces of some of the magnets. The magnets include first magnets in which the magnetic portions are on a circumferential portion in a radial outside surface of the first magnets and second magnets in which the magnetic portions are not on a radial outside surface of the second magnets. The first magnets and the second magnets are alternately arranged in the circumferential direction in each of a first portion and a second portion along the axial direction in the radial outside surface of the rotor core. The first magnets of the first portion and the second magnets of the second portion overlap each other, and the second magnets of the first portion and the first magnets of the second portion overlap each other.

Abstract: First and second sets of magnet assemblies and magnetic assemblies are alternately arranged in a circumferential direction in a first portion along an axial direction, and the first and second sets are alternately arranged in the circumferential direction in a second portion along the axial direction. When viewed in the axial direction, the first set of the first portion and the second set of the second portion overlap with each other, and the second set of the first portion and the first set of the second portion overlap with each other.

Abstract: A rotor includes a first rotating body and a second rotating body. The first rotating body includes a first rotor core, first magnets arranged in a circumferential direction, and first outer side surfaces arranged in the circumferential direction. Each of the first outer side surfaces is an outer side surface of the first magnet or an outer side surface of the first rotor core, and includes a first circular arc surface curved in a circular arc shape with a first curvature radius and arranged on one side in the circumferential direction and a second circular arc surface curved in a circular arc shape with a second curvature radius and arranged on the other side in the circumferential direction.

Abstract: Provided is a rotor for use in an inner rotor-type motor, comprising a plurality of magnets arranged in a circumferential direction around the center axis, and a rotor core formed of a magnetic material. The rotor core has an inner core part and a plurality of outer core parts. The plurality of outer core parts and the plurality of magnets are alternately arranged in a circumferential direction at a radially outer side of the inner core part. The magnet has a pair of circumferential end surfaces which are magnetic pole surface, and at least one of them is a protruded surface. Also, the magnet has a portion of which circumferential width is wider than a circumferential width of an outer end surface. For this reason, the volume of the magnet can be increased and the magnetic force of the rotor can be increased, without the need to increase the diameter of the rotor. As a result, when such rotor is incorporated into a motor, the torque of the motor can be improved.

Abstract: Provided is a rotor for use in an inner rotor-type motor, comprising a plurality of magnets arranged in a circumferential direction around the center axis, and a rotor core formed of a magnetic material. The rotor core has an inner core part and a plurality of outer core parts. The plurality of outer core parts and the plurality of magnets are alternately arranged in a circumferential direction at a radially outer side of the inner core part. The magnet has a pair of circumferential end surfaces which are magnetic pole surface, and at least one of them is a protruded surface. Also, the magnet has a portion of which circumferential width is wider than a circumferential width of an outer end surface. For this reason, the volume of the magnet can be increased and the magnetic force of the rotor can be increased, without the need to increase the diameter of the rotor. As a result, when such rotor is incorporated into a motor, the torque of the motor can be improved.