Abstract: An element chip manufacturing method disclosed herein includes a preparation process of preparing a substrate having a semiconductor layer, a wiring layer, a plurality of element areas and a dividing area, a resin layer formation process of forming a resin layer covering the wiring layer, an opening formation process of irradiating the wiring layer and the resin layer in the dividing area to form an opening in which the semiconductor layer is exposed in the dividing area, a reflow process of reducing the opening by reflowing the resin layer, and a singulation process of dividing the substrate into a plurality of element chips each including a different one of the element areas, by performing etching of the substrate with plasma along the opening reduced in the reflow process, using the resin layer as a mask.

Abstract: A stator includes a stator core, an insulator attached to the stator core, and coil wires. The insulator includes base portions respectively surrounding outer peripheral surfaces of teeth and an outer wall portion located immediately above the core back and extending in a circumferential direction. Each of the coil wires includes coils into which each of the coil wires is wound around more than one of the teeth by concentrated winding, a connecting wire connecting the coils, and a pair of lead wires located at two ends of each of the coil wires and extending from the coils. The connecting wire of each of the coil wires includes at least one outside-passing portion extending along an outer surface of the outer wall portion on a radially outer side of the outer wall portion.

Abstract: A motor includes a bearing holder and a first bearing. The bearing holder is fixed to a casing. The first bearing is interposed between the bearing holder and a shaft. The bearing holder includes a holder main body made of a resin and a ring made of a metal. The holder main body includes, around the central axis, a first arcuate portion including one or a plurality of through-holes passing therethrough in an axial direction and a second arcuate portion that does not include a through-hole. The first arcuate portion occupies a range of about ? or more of a total circumference of the holder main body in a circumferential direction. An outer ring of the first bearing is held by the ring.

Abstract: A motor includes a rotor having a shaft centered on a central axis that extends in an axial direction, a stator which is disposed to face the rotor and includes a plurality of coils, a housing in which the rotor and the stator are housed, and a bus bar assembly that is disposed on one side of the shaft in the axial direction, wherein the bus bar assembly includes a plurality of bus bars that are electrically connected to the plurality of coils of the stator and a bus bar holder that holds the plurality of bus bars, and wherein at least one bus bar among the plurality of bus bars is placed on a disposition surface part provided on the bus bar holder and extends in a direction crossing the central axis.

Abstract: A stator includes a stator core, an insulator attached to the stator core, and coil wires. The insulator includes base portions respectively surrounding outer peripheral surfaces of teeth and an outer wall portion located immediately above the core back and extending in a circumferential direction. Each of the coil wires includes coils into which each of the coil wires is wound around more than one of the teeth by concentrated winding, a connecting wire connecting the coils, and a pair of lead wires located at two ends of each of the coil wires and extending from the coils. The connecting wire of each of the coil wires includes at least one outside-passing portion extending along an outer surface of the outer wall portion on a radially outer side of the outer wall portion.

Abstract: A rotor includes a shaft, a rotor core fixed to the shaft, a magnet radially outside of the rotor core, a rotor cover including a tubular portion surrounding the rotor core and the magnet, and a resin portion including at least a portion thereof radially inside of the rotor cover. The rotor core includes a core through hole passing through the rotor core in an axial direction. The rotor cover includes a flange portion projecting radially inward from the tubular portion. The flange portion is on a first side of the rotor core in the axial direction, and includes a cover through hole passing through the flange portion in the axial direction.

Abstract: A motor includes a bearing holder and a first bearing. The bearing holder is fixed to a casing. The first bearing is interposed between the bearing holder and a shaft. The bearing holder includes a holder main body made of a resin and a ring made of a metal. The holder main body includes, around the central axis, a first arcuate portion including one or a plurality of through-holes passing therethrough in an axial direction and a second arcuate portion that does not include a through-hole. The first arcuate portion occupies a range of about ? or more of a total circumference of the holder main body in a circumferential direction. An outer ring of the first bearing is held by the ring.

Abstract: A motor includes a rotor having a shaft centered on a central axis that extends in an axial direction, a stator which is disposed to face the rotor and includes a plurality of coils, a housing in which the rotor and the stator are housed, and a bus bar assembly that is disposed on one side of the shaft in the axial direction, wherein the bus bar assembly includes a plurality of bus bars that are electrically connected to the plurality of coils of the stator and a bus bar holder that holds the plurality of bus bars, and wherein at least one bus bar among the plurality of bus bars is placed on a disposition surface part provided on the bus bar holder and extends in a direction crossing the central axis.