Abstract: The invention relates to a rotor unit for a brushless electric motor with an annular rotor core surrounding a central axis, a plurality of magnet arrangements that are arranged around the rotor core in a circumferential direction of the rotor and that each have a convex outer peripheral face, an inner contact face, two axial end faces and two side faces pointing in the circumferential direction, a magnet holder having a number of holding portions which are each arranged between two adjacent magnet arrangements and are moulded onto a ring portion of the magnet holder, wherein the holding portions are configured T-shaped in a cross section along a plane running transversely to the central axis and each have a shank portion and a head portion, wherein the shank portion lies on the side faces of the magnet arrangements in a contact region and the head portion lies on the peripheral faces of the magnet arrangements, wherein the head portion lies on the peripheral faces in a contact area, which contact area is s

Abstract: An axial fan includes a housing, an upper motor, and a lower motor. The housing includes an upper housing and a lower housing. A lower peripheral wall of the lower housing includes first engaging portions and lower protruding pieces. The lower protruding pieces oppose the first engaging portions in an axial direction and protrude axially upward from an axially upper surface. An upper peripheral wall of the upper housing includes upper engaging claws and upper notch grooves. The upper engaging claws extend axially downward from an axially lower surface, and include a second engaging portion that engages with the first engaging portion in a lower end portion. The upper notch grooves are notched axially upward from the axially lower surface radially inward of the upper engaging claw. At least a portion of the lower protruding pieces is located in the upper notch grooves.

Abstract: Embodiments of the present application provide a stator, comprising a coil group is provided with a first end part, a second end part, multiple coils respectively wound on a multiple teeth, and a transition line part configured to connect multiple coils, the first end part is provided with a first overlapping part having the same position as at least a part of the second end part in the circumferential direction, the second end part is provided with a second overlapping part having the same position as the first overlapping part in the circumferential direction, and a coil connecting part is connected with the first overlapping part and the second overlapping part.

Abstract: A power converter converts power from a power source into power to be supplied to a motor having n-phase (n is an integer of 3 or larger) windings. The power converter includes an inverter including switches connected to the windings, a controller to control operation of each of the switches, and a failure detector to detect a sign of failure in a drive system ranging from the power source to the motor. When a sign of failure is detected by the failure detector, the controller is configured or programmed to check presence or absence of a failure in the drive system while supplying power to the motor by causing the inverter to perform a failure operation.

Abstract: An optical assembly includes an optical element including a reflection surface to reflect light in a first axis direction, a holder to hold the optical element, a case to support the holder, a first swing mechanism to swing the holder around a first swing axis, and a second swing mechanism to swing the holder around a second swing axis perpendicular to the first swing axis. The holder includes first and second protrusions. The case includes first and second recesses. Each of the recesses includes a first side surface located on one side in the axial direction of the second swing axis and a second side surface located on the other side with respect to the corresponding protrusion. At least one of the first and second side surfaces includes an inclined surface inclined with respect to the second swing axis.

Abstract: A motor includes a housing and a metal shield plate. The housing includes a bearing holder. The shield plate includes a shield plate main body and a protrusion that protrudes upward from the shield plate main body. The protrusion has a tubular shape. In manufacturing the motor, the protrusion of the shield plate is inserted into a through-hole in the bearing holder. A working deformation portion is then formed such that an upper end of the protrusion is deformed to contact an upper surface of the bearing holder.

Abstract: A cooling device includes a cooling plate with a bottom wall portion with a lower surface which contacts a heat-generating component, a top wall portion which covers an upper surface of the bottom wall portion, a side wall portion which couples the bottom wall portion and the top wall portion, and an internal space which is surrounded by the bottom wall portion, the top wall portion, and the side wall portion to define a first cooling medium flow passage. The bottom wall portion includes blades on the upper surface. An inlet port or an outlet port is on one end side of the first cooling medium flow passage. An inner peripheral wall of the side wall portion includes a first bent portion which is bent convex inward between ends of the blades and the at least one of the inlet port and the outlet port.

Abstract: A motor includes a rotor, a stator that surrounds the radial outer side of the rotor, a housing that contains the rotor and the stator, a holder axially above the stator, a substrate fixed to the axial upper side of the holder, and a connector radially outward of the housing and electrically connected to the substrate. The holder includes a holder body, and a holder protrusion that connects to the holder body and extends radially outward from the housing. The connector contacts the underside of the holder protrusion.

Abstract: A motor for a driving device includes a rotor rotatable around a central axis, a stator facing the rotor, a busbar electrically connected to the stator, a busbar support to hold the busbar, a terminal bar including a first end electrically connected to the busbar, the terminal bar including a connection terminal at a second end and that is to be electrically connected to the driving device, and a seal to be attached to the driving device and located between the busbar and the connection terminal. The seal portion includes a through-hole into which the terminal bar is press-fitted.

Abstract: A driver of an automatic guided vehicle includes a crown gear (turning gear) fixed to a bottom of a vehicle body, a support shaft penetrating a center of the crown gear and extending vertically from the vehicle body, a frame supported by the support shaft to be rotatable on a horizontal plane, a wheel axle rotatably and horizontally provided on the frame, and a wheel connected to the wheel axle. A first motor and a second motor, which are drive sources, and a first planetary gear mechanism and a second planetary gear mechanism are provided at both ends in an axial direction of the wheel axle, respectively. Each carrier of the first and second planetary gear mechanisms is connected to the wheel axle, and each ring gear of the first and second planetary gear mechanisms meshes with the crown gear.

Abstract: A motor includes a rotor including a shaft extending in an axial direction, a stator surrounding a radially outer portion of the rotor, a support into which the conductor is inserted, the support being made of an insulating material, and a holder including through holes to hold the support, in which the support includes the first and second protuberances at least a portion of which is located in the through hole, the first and second protuberances being provided at intervals, and a base portion connecting the first and second, protuberances, and in which at least a portion of each of facing regions of a side surface of the first protuberance is close to the holder, and the second protuberance has a clearance with respect to the holder.

Abstract: A motor drive control device controls driving of a motor by performing PWM control of turning on-off of an arm switching element of a PWM inverter outputting a three-phase AC voltage to the motor, and detects current values of respective phases of the three-phase AC voltage. The motor drive control device turns off a lower arm switching element for a largest phase by causing a first PWM pulse based on a largest phase voltage command and a carrier signal throughout an entire first period during which the carrier signal rises or falls to be at a low level. The motor drive control device turns on a lower arm switching element for a smallest phase by causing a second PWM pulse based on a smallest phase voltage command and the carrier signal throughout an entire second period during which the carrier signal rises or falls to be at a high level.

Abstract: The motor unit includes: a motor having a motor shaft that rotates around a motor axis extending along a horizontal direction; a gear section connected to the motor shaft on one side of the motor shaft in an axial direction; a housing that houses the motor and the gear section; and an oil contained in the housing. The housing includes a motor housing section that has inside a motor chamber for housing the motor, and a gear housing section that has inside a gear chamber for housing the gear section. The housing is provided with an oil passage along which the oil circulates for cooling the motor. A pump that supplies the oil to the motor is provided in a channel of the oil passage. The pump has a pump motor. A rotation axis of the pump motor is parallel to the motor axis.

Abstract: A motor assembly includes a motor, a housing including a housing space to house the motor, oil in a vertically lower region of the housing space, and an oil passage to lead the oil from the vertically lower region of the housing space through the motor to the vertically lower region of the housing space. The oil passage includes a first oil passage extending through an inside of the motor, and a second oil passage extending through an outside of the motor. One of the first oil passage and the second oil passage includes a cooler to cool the oil therein.

Abstract: A position estimation device acquires detection values of magnetic field strength at three or more locations of a rotor in a range where a rotor angle is less than one rotation. A section is selected based on a detection value of the magnetic field strength from predetermined sections for a pole pair number of the rotor. A feature amount calculator is provided to calculate feature amounts of a waveform of the magnetic field strength based on a combination of the detection values of the magnetic field strength according to the section selected. An estimator is provided to determine, for each segment associated with the section selected, whether or not a magnitude relationship of the feature amounts learned in advance coincides with a magnitude relationship of the feature amounts calculated, and estimating, as a rotation position of the rotor, the pole pair number associated with the segment having the same magnitude relationship.

Abstract: An impeller includes Z blades, where Z is an integer equal to 5 or more, arranged in a circumferential direction of the impeller and extending radially, and pitch angles between adjacent blades are all different. In terms of an arbitrary pitch angle ?, when a pitch angle ?1 adjacent to the pitch angle ?, and a pitch angle ?2 adjacent to the pitch angle ?, different from the pitch angle ?1, satisfy a relation, ?1<?2, a pitch angle ?1 different from the pitch angle ? adjacent to the pitch angle ?1 and a pitch angle ?2 adjacent to the pitch angle ?2, different from the pitch angle ?, satisfy a relation, ?2<?1.

Abstract: Provided is a holding member that holds a motor. The holding member includes a base and multiple attachment parts. The base has the motor disposed on an upper surface thereof with a center axis of rotation of the motor arranged in an up-down direction. The attachment part is disposed radially outside the base. The attachment part includes a frame, a pair of grippers, a first projecting part, and a second projecting part. The frame surrounds an insertion hole penetrating in an axial direction and is connected to the base. The pair of grippers is disposed inside the insertion hole and extends radially outward from the base. The first projecting part is disposed between the pair of grippers and projects radially outward from the base. The second projecting part projects from the frame into the insertion hole.

Abstract: A motor control device includes an inverter to drive a motor, and a control calculator to calculate a current command value indicating a current to be supplied to the motor from the inverter. The control calculator includes a voltage control calculator to calculate a voltage command value indicating a voltage to be applied to the motor from the inverter based on a current deviation between the current command value and the actual current detection value, and a compensation calculator to add a compensation value to a signal value on at least one of an upstream side and a downstream side in a signal flow that passes through the voltage control calculator. The voltage control calculator calculates the voltage command value by adaptive control based on an actual angular velocity value indicating an angular velocity at which the motor rotates. The compensation calculator calculates the compensation value based on the actual angular velocity value and the target current command value.

Abstract: According to one aspect of the present disclosure, a rotor includes a plurality of permanent magnets and a support supporting the permanent magnet. The support includes at least one of an outside support fixed to a radial outside of the outer cores to circumferentially support an end face of the permanent magnet from both sides and an inside support fixed to a radial inside of the outer cores to circumferentially support the end face of the permanent magnet from both sides. Each of the outer cores includes an opposite face parallelly opposed to the end face of the permanent magnet in the circumferential direction. The outside support and the inside support each includes a support face circumferentially supporting the end face. The support face is disposed on a side closer to a center line of the permanent magnet than the opposite face in the circumferential direction.

Abstract: A motor unit includes a motor including a rotor, a stator radially outside of the rotor; a housing for housing the motor; an oil passage for circulating the oil in the housing space; and a gear portion connected to a shaft of the rotor. The housing includes a motor housing portion defining a motor chamber in an interior, a gear housing portion defining a gear chamber in an interior, and a partition dividing the gear chamber and the motor chamber. The oil passage includes a flow passage arranged in an interior of the housing, and an oil feeding structure on an upper side of the motor to feed the oil to at least one of a stator core or coil ends. The flow passage includes a portion extending along an axial direction to feed the oil to the oil feeding structure. The partition includes the portion of the flow passage.