Abstract: A laminated core includes a first connecting portion and a first groove. The first connecting portion connects back yoke portions in the stacking direction on an outer peripheral surface of a portion of a back yoke staked portion, the portion including an end portion on one side in the extending direction of an iron core piece. The first groove is located in a direction opposite to a first direction that is a direction from one side edge toward the other side edge in the iron core piece across the one side edge in the extending direction of the iron core piece with respect to the first connecting portion, and extends in the stacking direction of the back yoke stacked portion on the outer peripheral surface of the back yoke stacked portion.

Abstract: A method of manufacturing a stator includes a pressing step of punching an iron core piece forming part from a steel sheet by press molding, a mounting step of mounting insulating paper on each of a plurality of protruding portions arranged in a circumferential direction on an outer peripheral surface of a columnar roll member rotating about a central axis and extending along the central axis, and a stacking step of spirally winding the iron core piece forming part around the outer peripheral surface of the roll member while deforming it in one direction in a width direction by rotating the roll member in a state where the protruding portion and the insulating paper are inserted into a slot, and stacking the iron core piece forming part in a thickness direction.

Abstract: A rotor includes a columnar rotor core, having multiple core plates laminated in a thickness direction and a magnet insertion hole extending in an axial direction; and a magnet inserted in the magnet insertion hole. The core plates have multiple first core plates. The first core plates are continuously laminated in the axial direction. Each of the first core plates includes a contact portion and a deformation permitting portion. The contact portion defines a portion of an inner surface of the magnet insertion hole and contacts with the magnet. The deformation permitting portion is located on an opposite side of the magnet with the contact portion in between when the first core plates are viewed in the thickness direction, and permits deformation of the contact portion. Multiple contact portions in the first core plates overlap at least partially when the rotor core is viewed in the axial direction.

Abstract: A rotor includes stacked core plates, a hole, and a magnet inserted into the hole. A holding core plate has a through hole as part of the hole, a protrusion protruding inwardly from an inner surface of the through hole and being in contact with the magnet, and a displacement permission portion located in an opposite direction to a protrusion direction of the protrusion and permitting displacement of the protrusion in the opposite direction. The rotor includes at least one of a magnet-side chamfered portion in which the front side edge portion of the magnet is chamfered or a protrusion-side chamfered portion in which the tip end edge portion of the protrusion is chamfered. A sum of lengths of the magnet-side and protrusion-side chamfered portions is equal to or longer than a length of the protrusion in the protrusion direction as the rotor is viewed from the axial direction.

Abstract: A rotor includes core plates, a hole, and a magnet in the hole. The core plates include a first core plate and a second core plate frontward of the first core plate. The first core plate includes a first hole, a first protrusion protruding inward of the first hole, and a first portion located in an opposite direction to a protrusion direction of the first protrusion as viewed from the axial direction and permitting deformation of the first protrusion in the opposite direction. The second core plate includes a second hole, and at least one of a recess recessed in the opposite direction and overlapping the first protrusion as viewed in the axial direction, or a second portion located in the opposite direction with respect to the first protrusion as viewed in the axial direction and permitting deformation of an inner surface of the second hole in the opposite direction.