A manufacturing device includes: an upper plate on which a plunger is mounted; a lower plate arranged under the upper plate; and a tray placed on it, on which a laminated core body is mounted. The tray includes: a cylindrical section inserted in a shaft hole of the laminated core body; and a brim section contacting the lower plate from above and an outer portion of the laminated core body from below. The cylindrical section has a resin arrangement hole in which a resin tablet is arranged and the plunger for pressing it is inserted. The brim section has: a plurality of resin flow path grooves extending radially from the arrangement hole on a lower surface opposing the lower plate; and a plurality of gates, each of which extends upward from each of the plurality of flow path grooves and communicates with each of a plurality of magnet insertion holes.

A manufacturing device includes: an upper plate on which a plunger is mounted; a lower plate arranged under the upper plate; and a tray placed on it, on which a laminated core body is mounted. The tray includes: a cylindrical section inserted in a shaft hole of the laminated core body; and a brim section contacting the lower plate from above and an outer portion of the laminated core body from below. The cylindrical section has a resin arrangement hole in which a resin tablet is arranged and the plunger for pressing it is inserted. The brim section has: a plurality of resin flow path grooves extending radially from the arrangement hole on a lower surface opposing the lower plate; and a plurality of gates, each of which extends upward from each of the plurality of flow path grooves and communicates with each of a plurality of magnet insertion holes.

A ring magnet and a rotor core are disposed coaxially with high precision even in the case where variations occur in dimensional accuracy of components. A rotor includes: a rotation shaft; a rotor core mounted to the rotation shaft; a ring magnet mounted to an outer circumferential part of the rotor core; and a first opposing member mounted to the rotation shaft and opposed to the ring magnet in an axial direction of the rotation shaft. The first opposing member is provided with a first taper part inclined with respect to the axial direction of the rotation shaft. The ring magnet is provided with a first inner circumferential corner part abutted against the first taper part in the axial direction of the rotation shaft.

A ring magnet and a rotor core are disposed coaxially with high precision even in the case where variations occur in dimensional accuracy of components. A rotor includes: a rotation shaft; a rotor core mounted to the rotation shaft; a ring magnet mounted to an outer circumferential part of the rotor core; and a first opposing member mounted to the rotation shaft and opposed to the ring magnet in an axial direction of the rotation shaft. The first opposing member is provided with a first taper part inclined with respect to the axial direction of the rotation shaft. The ring magnet is provided with a first inner circumferential corner part abutted against the first taper part in the axial direction of the rotation shaft.

A motor rotor includes a cylindrical permanent magnet located around a rotary shaft, and a cylindrical armoring ring located around the permanent magnet. The permanent magnet and the armoring ring are integrally sintered.

A motor rotor includes a cylindrical permanent magnet located around a rotary shaft, and a cylindrical armoring ring located around the permanent magnet. The permanent magnet and the armoring ring are integrally sintered.

A rotor manufacturing apparatus includes a first die and a second die configured to sandwich and clamp multiple rotor cores, which include magnets accommodated in slots, in an axial direction. The first die includes multiple urging sections configured to urge the rotor cores toward the second die. One of the first die and the second die includes multiple supply passages configured to supply plastic to the slots of the rotor cores. The first die and the second die are configured to sandwich and clamp the rotor cores collectively against urging forces of the urging sections.

A rotor manufacturing apparatus includes a first die and a second die configured to sandwich and clamp multiple rotor cores, which include magnets accommodated in slots, in an axial direction. The first die includes multiple urging sections configured to urge the rotor cores toward the second die. One of the first die and the second die includes multiple supply passages configured to supply plastic to the slots of the rotor cores. The first die and the second die are configured to sandwich and clamp the rotor cores collectively against urging forces of the urging sections.

An electric propulsion system for a vertical takeoff-and-landing aircraft having an inverter assembly, a gearbox assembly, an electric motor assembly. The inverter assembly, the gearbox assembly, and the electric motor assembly may be substantially aligned along an axis. The inverter assembly, a gearbox assembly, and electric motor assembly may each abut at least one of the others. The electric engine may use a liquid, such as oil, for cooling and lubricating components of the inverter assembly, gearbox assembly, and electric motor assembly. Further, the electric engine may use volumes of oil for cooling and lubricating components below a threshold volume so that the electric engines do not require a fire protective barrier.

An electric propulsion system for a vertical takeoff-and-landing aircraft having an inverter assembly, a gearbox assembly, an electric motor assembly. The inverter assembly, the gearbox assembly, and the electric motor assembly may be substantially aligned along an axis. The inverter assembly, a gearbox assembly, and electric motor assembly may each abut at least one of the others. The electric engine may use a liquid, such as oil, for cooling and lubricating components of the inverter assembly, gearbox assembly, and electric motor assembly. Further, the electric engine may use volumes of oil for cooling and lubricating components below a threshold volume so that the electric engines do not require a fire protective barrier.