Abstract: A housing of an axial fan that allows air to flow in an axial direction includes a frame including, on an inner surface, an air channel through which air flows, stator vanes extending radially inward from the inner surface, a motor housing supported radially inward of the stator vanes, and a motor supported on one axial side of the motor housing. A portion of the stator vanes is provided on a surface on the other axial side of the motor housing.

Abstract: A motor drive device includes a first drive circuit to control an energization period of a first upper arm switch and a first lower arm switch connected to one end of a coil, a second drive circuit to control an energization period of a second upper arm switch and a second lower arm switch connected to another end of the coil, a current detection circuit to detect current flowing through the coil and output a current detection signal indicating a detection result of the current, a first protection circuit to determine whether overcurrent has occurred based on the current detection signal and output a first enable signal indicating a determination result to the first drive circuit, and a second protection circuit to determine whether overcurrent has occurred based on the current detection signal and output a second enable signal indicating a determination result to the second drive circuit.

Abstract: A motor case has a first case portion and a second case portion coupled to the first case portion. The stator has a stator core and an insulator fixed to the stator core. The insulator has a tubular portion having an outer circumferential surface and a polygonal shape in the cross-sectional view, and on the outer circumferential surface, insulator flat portions lined up in a circumferential direction. The first case portion includes: three or more core supports which project inward in the radial direction from an inner circumferential surface of a circumferential wall of the first case portion, come into contact with the core outer-circumferential surface, and are disposed at intervals from each other in the circumferential direction; and at least one first detent which is in contact with or is disposed to come into contact with the insulator flat portion.

Abstract: A motor assembly includes an output shaft disposed along a central axis extending in one direction, a motor that rotates the output shaft, a circuit board electrically connected to the motor, a power supply that supplies power to the motor and the circuit board, and a case having a tubular shape that extends in an axial direction and accommodates the motor, the circuit board, and the power supply. A substrate surface of the circuit board and the power supply are disposed to face each other in a predetermined direction that is orthogonal or substantially orthogonal to the axial direction.

Abstract: A motor includes a sheet-metal cover accommodating a stator and a substrate and a wiring assembly electrically connected to the substrate. The cover includes a wiring lead port, which is open to a wall of the cover and communicates with an outside and an inside of the cover. The wiring assembly includes cables connected to the substrate and extending from the inside of the cover to the outside through the wiring lead port, a sleeve with a tubular shape into which the cables are inserted, the sleeve having an elastic modulus smaller than an elastic modulus of a coated portion of the cable, and a binder that bundles the cables through the sleeve. The sleeve is opposed to the wiring lead port from the inside of the cover, and an outer diameter of the sleeve is larger than an inner diameter of the wiring lead port.

Abstract: A motor includes a shaft extending along a center axis, and a first groove that is recessed in a radial direction and extends in an axial direction, on an outer side surface of the shaft. The motor includes a stator core into which the shaft is inserted, and a rotation restrictor that is inserted into at least a portion of the first groove and restricts the stator core and the shaft in a circumferential direction. A carrier vehicle is equipped with the motor further including a lead wire extending from the stator. The shaft includes a shaft portion and a flange portion that overhangs to a radially outer side from one side of the shaft portion in the axial direction. The flange portion includes an opening through which the lead wire passes. The opening includes a notch connected to an outer side surface of the flange portion. The opening of the motor is positioned above the center axis.

Abstract: A motor includes a rotor rotatable about a central axis, and a stator opposing the rotor in a radial direction. The stator includes an annular core back and a stator core including teeth extending from the core back to one side in the radial direction. The stator core includes a laminated steel sheet in which electromagnetic steel sheets are laminated in a direction of the central axis. Each of the electromagnetic steel sheets includes a caulking dowel portion to which the adjacent electromagnetic steel sheets are connected by press-fitting. The caulking dowel portion includes a protrusion protruding from the core back to another side in the radial direction.

Abstract: A motor includes binding pins around which a coil lead wire is wound, and an end on one side in an axial direction of the binding pin and the coil lead wire are fixed to a surface facing one side in the axial direction of a substrate. An insulator assembly includes a substrate receiver contacting with the substrate from the other side in the axial direction. A heat sink is fixed to a cover, and an end on the other side in the axial direction of the heat sink presses down the integrated circuit mounted on the substrate toward the other side in the axial direction. The heat sink and the substrate receiver are disposed at positions where the heat sink and the substrate receiver overlap each other as viewed in the axial direction.

Abstract: A motor includes a rotor rotatable about a central axis, and a stator opposing the rotor in a radial direction. The stator includes a stator core including an annular core back and teeth extending in the radial direction from the core back, bobbins attachable to the teeth, respectively, in the radial direction, a coil wire wound around the bobbin, the bobbin including a cylindrical tube portion extending in the radial direction and a protruding piece that protrudes in the radial direction from an upper end, close to the core back, of the tube portion and is fixed to the core back, and an annular fixing member covering the core back and the protruding piece from an upper side.

Abstract: A motor includes a cover including a first cup body and a second cup body, each including a bottomed tubular shape. The first cup body and the second cup body are disposed with openings of the peripheral wall portions facing each other. The second cup body includes a bottom wall portion provided with stud bolts projecting from the bottom wall portion to one axial direction and spaced apart from each other in a circumferential direction. An end surface of a heat sink, facing the one axial direction, is in contact with a portion positioned between the stud bolts adjacent to each other in the circumferential direction in a surface of the bottom wall portion of the second cup body in the other axial direction.

Abstract: A control apparatus includes a controller that controls a motor, a first transmission channel connected to a first power-supply terminal of an alternating-current source that supplies an alternating-current voltage, a second transmission channel connected to a second power-supply terminal of the alternating-current source, and a third transmission channel connected to each of the first transmission channel and the second transmission channel. The controller switches the rotational speed of the motor based on the voltage value of a signal input to the controller in accordance with a first connection status of the first transmission channel and the third transmission channel and a second connection status of the second transmission channel and the third transmission channel.

Abstract: A motor includes a cover with first and second cup bodies. A flange portion of each of the first and second cup bodies includes first recesses recessed radially inward from an outer peripheral edge of the flange portion and evenly spaced apart in a circumferential direction of the flange portion, second recesses recessed radially inward from the outer peripheral edge of the flange portion, have a same circumferential width as that of the first recess, and are evenly spaced apart in the circumferential direction, a total number of the second recesses is the same as a total number of first recesses, and claw portions extending radially outward from a bottom surface of the corresponding second recess and have a circumferential width narrower than that of the second recess.

Abstract: A signal conversion device includes a first signal input terminal, a second signal input terminal, and a detector. A first AC signal is supplied to the first signal input terminal from a signal source. The second signal input terminal is supplied with an in-phase signal that is in phase with the first AC signal and an opposite-phase signal that is opposite in phase with the first AC signal. The second signal input terminal is supplied with a second AC signal whose phase has been switched by a switchover between the in-phase signal and the opposite-phase signal from the signal source. The detector detects, using the supplied first AC signal, whether the supplied second AC signal is the in-phase signal or the opposite-phase signal.

Abstract: A motor unit includes a motor, a controller that outputs a pulse signal, a driver that supplies a drive current to the motor based on the pulse signal, and a detector that determines an actual rotation number of the motor. The controller includes calculators that calculate control values of a rotation number of the motor, and control stages. The controller also includes a pulse generator that selects one of the control values calculated by the calculators to generate the pulse signal based on the control value selected, at each of the control stages.

Abstract: A motor includes a rotor including a shaft extending along a central axis, a stator radially facing the rotor, a circuit board electrically connected to a coil of the stator, and a motor case. The motor case includes a first case portion with a bottomed tubular shape to accommodate the rotor, the stator, and the circuit board, and a second case portion with a bottomed tubular shape that axially faces the first case portion and is connected to the first case portion. A grounding terminal to electrically connect an inner peripheral surface of the second case portion and a grounding electrode on the circuit board is provided.

Abstract: A motor drive circuit includes an upper switch, a lower switch connected in series with the upper switch and drives a brushless DC motor, a gate drive circuit that drives the lower switch and a brake circuit that uses an inductive voltage generated by the brushless DC motor to apply a voltage to a gate terminal of the lower switch via the gate drive circuit and turns on the lower switch. The gate drive circuit includes a push element that applies a predetermined source voltage to the gate terminal when on, a pull element that pulls out charge from the gate terminal when on, and a rectifier between the push element and the gate terminal to rectify current in a direction from the push element toward the gate terminal.

Abstract: A counter-rotating axial flow fan includes a first fan including a first impeller including first blades radially arranged around a predetermined central axis, a first motor rotating the first impeller around the central axis, and a first case surrounding an outer periphery of the first impeller, and a second fan including a second impeller including second blades radially arranged around the central axis, a second motor rotating the second impeller around the central axis, and a second case surrounding an outer periphery of the second impeller. End surfaces of the first and second cases contact each other at a first position in an axial direction, the first and second motors face in opposite directions from each other in the axial direction, and end surfaces of the first and second motors are opposite to each other at a second position that differs from the first position.