Abstract: A motor includes a rotor about a central axis, a stator having coils, and bypass bus bars connecting in-phase coils. The coils include a first-phase coil and a second-phase coil. The bypass bus bars each include a first terminal part and a second terminal part. The first-phase coil and the second-phase coil are adjacent to each other in a slot in which a first lead wire extending from the first-phase coil and a second lead wire extending from the second-phase coil are each drawn to one side in an axial direction. The first lead wire is connected to the first terminal part of one of the bypass bus bars. The second lead wire is connected to the second terminal part of another of the bypass bus bars. The first terminal part and the second terminal part are aligned in a circumferential direction and shifted in a radial direction.

Abstract: A motor mounted on a drone includes a rotor including a propeller mounting portion with a propeller detachably attached, the rotor being rotatable about a central axis, a stator radially facing the rotor with a gap therebetween, and an auto-balancer capable of automatically correcting dynamic balance of the rotor.

Abstract: An interior permanent magnet motor includes a rotor with permanent magnets spaced apart in a circumferential direction, and a rotor core with core pieces positioned between adjacent permanent magnets. The permanent magnets include a pair of corner portions at each of an end on an outside in a radial direction and an end on an inside in the radial direction. Each of the core pieces includes at least one of an outer support portion that supports one corner portion of the pair of corner portions at the end of the permanent magnets on the outside in the radial direction or an inner support portion that supports one corner portion of the pair of corner portions at the end of the permanent magnets on the inside in the radial direction, and restricts movement of the permanent magnets in the radial direction.

Abstract: An inline axial flow fan includes a first fan including a first impeller, a first motor portion, and a first case, and a second fan including a second impeller, a second motor portion, and a second case, the first fan and the second fan being positioned in sequence from one axial side to another axial side. The first case includes multiple first slits, and the second case includes multiple second slits. The inline axial flow fan includes a flange extending radially outward from an outer peripheral surface of the first case or the second case located between the first slit and the second slit in the axial direction.

Abstract: An inline axial flow fan includes a first fan including a first impeller, a first motor portion, and a first case, and a second fan including a second impeller, a second motor portion, and a second case, the first fan and the second fan being positioned in sequence from one axial side to another axial side. The first case and the second case are accommodated in a housing, and only one of the first case and the second case includes multiple slits that connect the inside and the outside of the first case and the second case in the radial direction.

Abstract: A drive device includes a hollow hub rotatable about hub shafts extending parallel to a center axis, a motor housed in the hub and fixed to the hub shafts, and a speed reducer connected to the motor and the hub. The motor includes a rotor including a motor shaft extending parallel to the hub shafts, a stator disposed outside the rotor in a radial direction, and a motor housing holding the stator therein. The drive device includes thermal grease thermally connecting the hub and the motor housing to each other.

Abstract: A motor mounted on a drone includes a rotor including a propeller mounting portion with a propeller detachably attached, the rotor being rotatable about a central axis, a stator radially facing the rotor with a gap therebetween, and an auto-balancer capable of automatically correcting dynamic balance of the rotor.

Abstract: An inline axial flow fan includes a first fan including a first impeller, a first motor portion, and a first case, and a second fan including a second impeller, a second motor portion, and a second case, the first fan and the second fan being positioned in sequence from one axial side to another axial side. The first case includes multiple first slits, and the second case includes multiple second slits. The inline axial flow fan includes a flange extending radially outward from an outer peripheral surface of the first case or the second case located between the first slit and the second slit in the axial direction.

Abstract: An inline axial flow fan includes a first fan including a first impeller, a first motor portion, and a first case, and a second fan including a second impeller, a second motor portion, and a second case, the first fan and the second fan being positioned in sequence from one axial side to another axial side. The first case and the second case are accommodated in a housing, and only one of the first case and the second case includes multiple slits that connect the inside and the outside of the first case and the second case in the radial direction.

Abstract: In a speed reducing unit with an electric motor, a speed reduction mechanism has: an elliptical cam that rotates together with a rotating part; a flexible external gear that deforms according to the rotation of the elliptical cam; a flexible bearing that is located between the elliptical cam and the flexible external gear; and a movable internal gear that rotates together with an output part. The flexible external gear and the movable internal gear are engaged with each other. The electric motor has: a rotor holder that is part of the rotating part and that rotates together with the elliptical cam; a rotor magnet that is fixed to the rotor holder; and a stator that is fixed to a casing. The rotor holder has a rotor-holder lid part, and the positions of the rotor-holder lid part and the flexible bearing in the axial direction at least partially overlap.

Abstract: An electric motor-attached speed reducer includes a first member, an electric motor, a speed reduction mechanism, and a second member. The electric motor is arranged to produce rotational motion with respect to the first member. The speed reduction mechanism is arranged to transfer the rotational motion obtained from the electric motor while reducing the speed thereof. The second member is arranged to rotate relative to the first member at a rotation rate resulting from the speed reduction. A first bearing is arranged between the first and second members. A second bearing is arranged between the first member and a rotor of the electric motor. The speed reduction mechanism includes a flexible third bearing arranged between a non-perfect circular cam and a flexible external gear. The second bearing is arranged to radially overlap with a rotor holder at a first axial position.

Abstract: A drive device includes a hollow hub rotatable about hub shafts extending parallel to a center axis, a motor housed in the hub and fixed to the hub shafts, and a speed reducer connected to the motor and the hub. The motor includes a rotor including a motor shaft extending parallel to the hub shafts, a stator disposed outside the rotor in a radial direction, and a motor housing holding the stator therein. The drive device includes thermal grease thermally connecting the hub and the motor housing to each other.

Abstract: A planetary gear mechanism includes a sun gear, planetary gears, an annular internal gear, a carrier that is fixed to a bracket and includes a second lid, and a support shaft. An output unit is supported to be rotatable by a first bearing attached to the support shaft and a second bearing attached to the bracket, and fixed to the internal gear. The bracket includes a protrusion protruding from a first lid to one side in the axial direction. A radially inside surface of the protrusion includes a first curved surface extending in a circumferential direction as viewed along the axial direction. The carrier includes a second curved surface located radially inside the first curved surface. The second curved surface extends in the circumferential direction as viewed along the axial direction, and contacts with the first curved surface.

Abstract: A motor includes a circuit board, a rotation sensor attached to the circuit board, a connector protruding from the circuit board to a second side in an axial direction, and a cable electrically connected to the rotation sensor. A housing includes a protruding cylinder and a bearing holder located radially inside of the protruding cylinder. The circuit board is located on a first side in the axial direction of the protruding cylinder. The protruding cylinder includes an extraction hole radially penetrating a wall of the protruding cylinder. The connector is located radially inside of a stator. An end on the second side in the axial direction of the connector is located in the protruding cylinder. The cable is extracted from the end on the second side in the axial direction of the connector to a radial outside of the protruding cylinder through the extraction hole.

Abstract: A drive device that rotates a wheel includes a motor including a motor shaft disposed along a center axis, a speed reduction mechanism connected to one side in an axial direction of the motor shaft, and an output unit to which rotation of the motor shaft is transmitted through the speed reduction mechanism. The motor includes a rotor including the motor shaft, a stator opposed to the rotor in a radial direction with a gap interposed therebetween, and a housing accommodating the rotor and the stator. The housing includes a first fixing unit fixed to a chassis of a traveling body on which the drive device is mounted. The stator includes a stator core and coils mounted on the stator core. The stator core contacts directly with the housing.

Abstract: A planetary gear mechanism includes a sun gear, planetary gears, an annular internal gear, a carrier that is fixed to a bracket and includes a second lid, and a support shaft. An output unit is supported to be rotatable by a first bearing attached to the support shaft and a second bearing attached to the bracket, and fixed to the internal gear. The bracket includes a protrusion protruding from a first lid to one side in the axial direction. A radially inside surface of the protrusion includes a first curved surface extending in a circumferential direction as viewed along the axial direction. The carrier includes a second curved surface located radially inside the first curved surface. The second curved surface extends in the circumferential direction as viewed along the axial direction, and contacts with the first curved surface.

Abstract: In a speed reducing unit with an electric motor, a speed reduction mechanism has: an elliptical cam that rotates together with a rotating part; a flexible external gear that deforms according to the rotation of the elliptical cam; a flexible bearing that is located between the elliptical cam and the flexible external gear; and a movable internal gear that rotates together with an output part. The flexible external gear and the movable internal gear are engaged with each other. The electric motor has: a rotor holder that is part of the rotating part and that rotates together with the elliptical cam; a rotor magnet that is fixed to the rotor holder; and a stator that is fixed to a casing. The rotor holder has a rotor-holder lid part, and the positions of the rotor-holder lid part and the flexible bearing in the axial direction at least partially overlap.

Abstract: A stationary portion of a motor includes a stator core including teeth, an insulator covering a surface of the stator core, a coil including a conductive wire, a housing, and a circuit board. The housing includes a cylindrical portion in which the stator core is fixed to the outer circumference thereof and a base portion extending from the cylindrical portion radially outward. The circuit board is disposed above the base portion and below the stator core, to which the conductive wire is electrically connected. The insulator includes a tubular portion covering the outer circumference of the cylindrical portion and a vertically deformable elastic portion protruding from the tubular portion radially outward. The circuit board is fixed to the upper surface of a seat portion of the base portion. The circuit board is in contact with the lower surface of the elastic portion radially inside the seat portion.

Abstract: An electric motor-attached speed reducer includes a first member, an electric motor, a speed reduction mechanism, and a second member. The electric motor is arranged to produce rotational motion with respect to the first member. The speed reduction mechanism is arranged to transfer the rotational motion obtained from the electric motor while reducing the speed thereof. The second member is arranged to rotate relative to the first member at a rotation rate resulting from the speed reduction. A first bearing is arranged between the first and second members. A second bearing is arranged between the first member and a rotor of the electric motor. The speed reduction mechanism includes a flexible third bearing arranged between a non-perfect circular cam and a flexible external gear. The second bearing is arranged to radially overlap with a rotor holder at a first axial position.

Abstract: A method of manufacturing a rotating electrical machine includes: fixing a rotor core to a shaft; assembling a stationary assembly in which a first bearing is fixed to a housing bottom portion of a substantially cylindrical housing member having a closed bottom and in which an annular stator is fixed to an inner circumferential surface of a cylinder portion of the housing member; inserting the rotor core into the stator; fitting an upper portion of the shaft into a second bearing supported by a bearing support member. The method further includes fixing the bearing support member to an upper portion of the housing member; and axially inserting a plurality of rotor magnets into a plurality of axially-extending hole-shaped or groove-shaped magnet holding portions formed in the rotor core, through a magnet insertion hole defined in one of the bearing support member and the housing bottom portion.