Abstract: A drive apparatus includes: a motor having a rotor and a stator core; a housing; and a first injection port to inject a refrigerant into the stator core. The stator core includes: a core body surrounding the rotor; and a fixing portion projecting radially outward from the core body and fixed to the housing. The fixing portion includes an upper fixing portion. The first injection port is lower than an end portion of the upper fixing portion. The upper fixing portion is on one circumferential side of the first injection port. The first injection port is open in a first direction facing a directly lower side or a second direction angled to the one circumferential side with respect to the first direction, and is facing a portion on the other circumferential side of a boundary with an end portion of the upper fixing portion on the other circumferential side.

Abstract: A cooling device includes a cooling assembly which includes a cold plate extending in a first direction, a pump and a tank on one side of the cold plate in a second direction perpendicular to the first direction, and a partition extending in the first direction and covering the cold plate on one side in the second direction. The cold plate and the partition define a first refrigerant flow path through which a refrigerant flows. The pump includes a pump chamber in which an impeller is housed, the impeller moving the refrigerant. The tank includes a tank chamber in which the refrigerant flows. The pump chamber and the tank chamber communicate with each other through a first tank hole portion. The partition includes a first hole portion through which the first refrigerant flow path and the tank chamber communicate. The first tank hole portion is provided on one side in the first direction with respect to the first hole portion.

Abstract: An aspect of a drive controller controls drive of a three-phase motor, and includes an imbalance calculation unit that calculates an electrical imbalance between phases in the three-phase motor, a control value calculation unit that calculates current control values in respective axial directions of a rotating coordinate system of the three-phase motor according to a given target, and a balance compensation unit that reduces the imbalance by adding a compensation value to a current control value in an axial direction other than a q-axis of the current control values calculated by the control value calculation unit.

Abstract: A stator is formed by laminating electrical steel sheets punched into a predetermined shape. The stator includes split cores that are punched out from the electrical steel sheets to have an annular shape. A first group of the split cores adjacent to each other in the circumferential direction have the same rolling direction, and a second group of the split cores adjacent to each other in the circumferential direction have different rolling directions.

Abstract: In one aspect of a motor of the present invention, an inverter housing portion is located on the radially outer side of a stator housing portion. A housing has a tubular circumferential wall surrounding the rotor and the stator on the radially outer side of the rotor and the stator, and is a single member. The circumferential wall has a first cooling flow path, and a partition wall that partitions the stator housing portion and the inverter housing portion. The first cooling flow path extends in the circumferential direction, and at least a part of the first cooling flow path is provided in the partition wall. As viewed along the predetermined direction, a portion of the first cooling flow path provided in the partition wall has a portion overlapping the inverter and a portion overlapping the capacitor.

Abstract: According to one aspect of the present disclosure, a rotor includes a shaft, a rotor core including an inner core and a plurality of outer cores, a mold resin unit covering, the mold resin unit, and a plurality of permanent magnets. The mold resin unit includes a gate mark in a region between the outer cores adjacent to each other in the circumferential direction, and the gate mark is provided in all regions between the adjacent outer cores or in a region between the outer cores, the region being adjacent to a region between the even-numbered adjacent outer cores in which the gate mark is not disposed in all the regions between the adjacent outer cores.

Abstract: A stator for use in a motor includes a stator core, an insulator, a coil, and a terminal pin. The stator core includes a core back having an annular shape and teeth. The insulator covers at least a portion of the stator core. The coil is defined by a conductive wire wound around the teeth via the insulator. The terminal pin extends axially upward from an upper surface of the insulator and is connected to an end portion of the conductive wire. The insulator includes an annular portion, first protruding portions, and second protruding portions. The annular portion covers at least a portion of the core back and is centered on the central axis. The plurality of first protruding portions cover at least a portion of each of the teeth and protrude radially outward from the annular portion.

Abstract: A fan includes an impeller rotating on a central axis, an impeller housing, a motor located on one side in an axial direction of the impeller and driving the impeller to rotate, and a motor housing. The impeller housing is provided with an air inlet. The fan further includes a pre-pressing portion expanding radially inward from an edge of the air inlet. The pre-pressing portion includes a pressing portion located on another side in the axial direction of the impeller and pressing, from the another side in the axial direction, an end portion of the impeller on the another side in the axial direction, and at least two connection portions connected between an outer periphery of the pressing portion and the edge of the air inlet. The connection portions are disposed obliquely with respect to the axial direction.

Abstract: A motor assembly includes a motor, a housing that accommodates the motor, an inverter electrically connected to the motor, an inverter case that accommodates the inverter, an auxiliary device provided in a lower portion of the housing to oppose a road surface, a wire harness that includes a first connector connected to a connector provided in the inverter case, a second connector connected to a connector provided in the auxiliary device, and an electric wire connecting the first connector and the second connector, and a lower connector cover provided in the lower portion of the housing and covering the second connector from a lower side.

Abstract: Provided is a manufacturing method of a wire rod for forming a coil, the manufacturing method including the steps of: placing an element wire in a forming space surrounded by a plurality of split dies; and pressure-forming the element wire by moving the plurality of split dies in a direction of narrowing the forming space. In the step of pressure-forming the element wire, at least one of the plurality of split dies is moved, and the plurality of split dies each having a surface that changes in shape in a longitudinal direction of an element wire to pressure-form the element wire into the wire rod having a plurality of different cross-sectional shapes in the longitudinal direction.

Abstract: An axial fan includes an impeller rotatable about a central axis extending in a vertical direction, a motor, and a housing. The motor includes a stator and a rotor. The impeller includes blades on a radially outer surface of an impeller cup fixed to the rotor. The housing includes a motor base portion below the motor to support the stator, a tubular portion radially outside of the impeller, a first rib below the blades to join the motor base portion to the tubular portion, and a second rib being annular, centered on the central axis, and joined to the first rib. A lower edge of each blade includes a first blade region that is convex downward. A radially inner end of the second rib is radially outward of a lower end of the first blade region.

Abstract: The brake driving control circuit, which controls an electromagnetic brake that releases the brake by applying a current, is provided with: a first rectifying element provided between a first power supply of a first circuit voltage and one terminal of the electromagnetic brake; a cut-off switch inserted into a line through which the first power supply supplies power; a first switching element provided between the other terminal of the electromagnetic brake and a ground point; and a second switching element and a second rectifying element provided in series between a second power supply of a second circuit voltage, which is different from the first circuit voltage, and the one terminal of the electromagnetic brake.

Abstract: A manufacturing method for a coil includes: a step of winding a wire (conductive wire) in multiple layers and multiple rows and forming a coil having a trapezoidal cross-sectional shape; a step of arranging the coil in a molding space surrounded by a plurality of split dies; and a step of moving the slit die in a direction of narrowing the molding space to mold the cross-sectional shape of the coil. In the step of molding the cross-sectional shape, at least one of the plurality of split dies is moved to mold the cross-sectional shape into a fan shape by surfaces formed in the split dies.

Abstract: A power conversion device includes a first inverter including an upper arm and a lower arm and connected to a first end of a winding wire of each phase of a motor, a second inverter including an upper arm and a lower arm and connected to a second end on the other side of the first end, a first power supply to supply power to the upper arm of the first inverter and the lower arm of the second inverter, and a second power supply to supply power to the upper arm of the second inverter and the lower arm of the first inverter.

Abstract: A power conversion device includes a first inverter and a control circuit that controls an on/off operations of switches in the first inverter and diagnoses disconnection failures of n-phase windings, where n is an integer of three or more. The control circuit generates a control signal to turn off all of n low-side switches and n high-side switches, supplies the control signal to the n low-side switches and the n high-side switches and measures the n-phase voltages that change depending on patterns of on failures of the switches, and executes a first failure diagnosis to diagnose the on failures of the n low-side switches and the n high-side switches based on the measured n-phase voltages by referring to a table associating the patterns of the on failures of the switches with n-phase voltage levels.

Abstract: A rotor unit for a brushless electric motor, incudes 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. 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. 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.

Abstract: A motor includes a rotor including a rotating shaft extending along a center axis, a cylindrical rotor core provided outside the rotating shaft in a radial direction, and two discoid weight plates provided at two ends of the cylindrical rotor core in an axial direction, and a stator opposing the rotor in the radial direction. A radius of each weight plate is smaller than a radius of the rotor core, and a difference between the radius of the rotor core and the radius of each weight plate is larger than an air gap between an outside of the rotor core in the radial direction and an inside of the stator in the radial direction.

Abstract: A cooling device includes at least two cooling units, each cooling unit including a plate-shaped cold plate extending in a horizontal direction, a radiator extending in a first direction perpendicular to the horizontal direction and having a plurality of plate-shaped fins which, on the cold plate, is disposed parallel to a second direction perpendicular to the first direction, and a pump which supplies a refrigerant liquid to the cold plate and the radiator, in which the pump is adjacent to the radiator and is disposed in the second direction of the radiator, and the pump of one first cooling unit of the two cooling units faces the other second cooling unit of the two cooling units in the second direction or in a third direction orthogonal to the first direction and the second direction.

Abstract: A motor includes a first inverter electrically connected to a first end of a winding of each phase, and a second inverter electrically connected to a second end of the winding of each phase. Each of the first and second inverters includes low-side switching elements and high-side switching elements. FETs of the first inverter are electrically connected to a first end of a U-phase winding. FETs of the second inverter are electrically connected to a second end of the U-phase winding. At least a portion of a current flowing from one of the FETs of the first inverter to the U-phase winding flows to one of the FETs of the second inverter. One of the FETs of the first inverter and one of the FETs of the second inverter are adjacent to each other.

Abstract: A motor includes a rotor with one or more magnets, a rotor core holding the one or more magnets, a spacer that contacts the one or more magnets, and a rotor holder. The rotor holder includes a holder lid portion and a holder tubular portion in a tubular shape extending to one side in the axial direction from a radially outer edge of the holder lid portion. The holder lid portion includes a holder first surface that extends radially inward from an inner surface of the holder tubular portion, a holder second surface that extends radially and is radially inward of the holder first surface and on the other side in the axial direction, and a connecting surface connecting the holder first surface and the holder second surface.