Abstract: A method for manufacturing a laminated iron core includes providing a plurality of annular iron core piece rows, each of which is configured by annularly arranging a plurality of divided iron core pieces including yokes and teeth, and the yokes of the annularly-adjacent divided iron core pieces in the annular iron core piece row are mutually different in shape. In the method, the annular iron core piece rows are laminated by changing a rotational angle of the newly laminated annular iron core piece row relatively to the lastly laminated annular iron core piece row laminated so that the divided iron core piece with a shape different from that of the divided iron core piece is laminated on the lastly laminated divided iron core piece.

Abstract: Provided is a rotating electric machine capable of downsizing a coil end. The rotating electric machine includes an armature core and a plurality of coils. The plurality of coils each include a plurality of turn portions. The plurality of turn portions each include an inner-layer-side turn portion and an outer-layer-side turn portion. The inner-layer-side turn portion includes a first inner-layer-side bent portion, a first inner-layer-side oblique portion, and an inner-layer-side shift portion which is twisted. The outer-layer-side turn portion includes a first outer-layer-side bent portion, a first outer-layer-side oblique portion, and an outer-layer-side shift portion. The outer-layer-side shift portion has the inner-layer-side shift portion arranged between the outer-layer-side shift portion and the armature core.

Abstract: A method for connecting lamination parts to form a lamination stack in which lamination parts are stamped out from an electrical strip that is coated with an activatable adhesive layer on at least one of its flat sides and the stamped-out lamination parts are stacked and glued to form lamination stacks, wherein before the lamination parts are stamped out, the electrical strip is embossed in a first sub-region, which produces multiple protruding spacers on at least one flat side of the electrical strip, which spacers, after a first lamination part is stamped out from this first sub-region, facilitate a detachment of the stacked and glued lamination parts into lamination stacks.

Abstract: An induction motor includes a stator and a rotor. The stator is configured to generate a rotating magnetic field. The rotor is disposed inside the stator, separated from the stator by an air gap, and is configured to rotate around an axis in response to the rotating magnetic field. The rotor includes a rotor core, multiple end rings, and multiple collars. The end rings are attached at opposite ends of the rotor core. Each end ring has one of multiple regions disposed outside the air gap. Each region has an outer surface. The collars are attached in a prestressed condition around the outer surface of each region. The prestressed condition is configured to maintain a compressive stress in the end rings at a maximum-designed rotational speed of the rotor.

Abstract: A method to produce rotors or stators of electric machines having radial grooves into which webs of flat windings having parallel webs and winding heads connecting said webs being pulled, wherein a winding is produced on a rotating, strip-shaped flat former shorter than the winding such that windings are pulled off the former and transferred into a linear transfer device, which transports the windings to a removal position at which the windings are transferred into radial grooves of a rotor or of the transfer tool for transfer into radial grooves of a stator, wherein the former, the transfer device, and the rotor or the transfer tool being jointly rotated about an axis of rotation of the former when rotated to form windings.

Abstract: Shaft for an electric machine, includes a core seat for a laminated core and two shaft ends extending axially outwardly from the core seat in opposite directions, wherein the core seat has at least one core seat portion extending in the axial direction with a polygonal profile for forming a polygonal connection to the laminated core.

Abstract: A rotor includes an assembly of laminations including a plurality of radially-projecting poles, a winding of electrically conductive wires to be wound around each pole by means of wire-guiding heads arranged axially on either side of the lamination assembly. A guiding head support is inserted between the lamination assembly and each guiding head such that: an internal radial face of the support abuts against an external radial face at an axial end of the lamination assembly; and a peripheral surface of the support, which projects axially outward from the internal radial face of the support, is in contact with a contact face of the guiding head that is orientated radially outward from same, the guiding head abutting against the peripheral surface of the support.

Abstract: A method of manufacturing a rotating body includes disposing an end plate on an end surface of the core body in a height direction, and forming the rotating body by welding the end plate and the core body together. The rotating body is formed by welding the end plate and the core body together while a temperature of the core body and the end plate is within a predetermined operational a temperature range associated with rotation of the rotating body in a manufactured state of operation.

Abstract: A rotating electrical machine includes a coil, a rotor including a shaft, a rotor core, a commutator including plural hooks being provided with a first hook to which an end of the coil is connected, the coil wound on a predetermined tooth of plural teeth, and an insulator attached to the rotor core, and a stator. The insulator includes an annular portion provided to surround the plural hooks which are aligned along a circumferential direction of the shaft, and a protrusion protruding opposite to the rotor core. The protrusion is arranged on a path where an end part of the coil passes through, the end part corresponding to an area from a part connected to the predetermined tooth to the end of the coil connected to the first hook, the protrusion being hooked by the end part.

Abstract: A rotor includes a rare-earth magnet magnetized in a radial direction, a rotor core, and a thermal conduction sheet formed of a deformable material. The rotor core includes a first part, a thin-wall part including a second part that is harder than the first part, and a magnet insertion hole. The thin-wall part is situated between a region of end of the magnet insertion hole in a circumferential direction and an outer edge of the rotor core.

Abstract: A rotor of an electric machine, in particular an electric motor, comprising a rotor body which circumferentially surrounds a shaft, and with a plurality of magnets. Each of the magnets is in each case arranged within a radially extending pocket of the rotor body, and each of the pockets is connected by means of an axially extending slot, each with a radially inner chamber of the rotor body. An electric machine is also provided.

Abstract: In one embodiment, a lidar system includes a light source configured to emit pulses of light and a scanner configured to scan at least a portion of the emitted pulses of light along an interlaced scan pattern. The scanner includes a first scanning mirror configured to scan the portion of the emitted pulses of light substantially parallel to a first scan axis to produce multiple scan lines of the interlaced scan pattern, where each scan line is oriented substantially parallel to the first scan axis. The scanner also includes a second scanning mirror configured to distribute the scan lines along a second scan axis that is substantially orthogonal to the first scan axis, where the scan lines are distributed in an interlaced manner.

Abstract: According to one embodiment, a method for manufacturing an iron core product includes providing an iron core body which includes a magnet insertion hole in which a permanent magnet is disposed, injecting a molten resin into the magnet insertion hole of the iron core body at a first pressure, and setting a pressure applied to the molten resin to a second pressure lower than the first pressure after the molten resin is injected into the magnet insertion hole and before the molten resin is cured.

Abstract: A method and device for manufacturing winding mats for manufacturing a coil winding of an electric machine. The winding mat is composed of wave winding wires bent as a flat winding in one plane. To be able to manufacture different coil mats with improved electrical characteristics easily and reliably in large series, it is proposed not to interlace or twist the wave winding wires, but to plug them at least partially. In addition, a method and a device for manufacturing a coil mat from several winding mats designed as individual mats are proposed. The device preferably comprises an offsetting device for introducing height offsets into winding heads of the wave winding wires.

Abstract: A support device for a rotor of an internal-rotor synchronous machine of a motor vehicle includes a star disk, which is able to be arranged on the laminated core of the rotor between an end side of the laminated core and end windings of the rotor windings, and a support ring for encasing the star disk. The star disk has a ring carrier for arranging on a rotor yoke of the laminated core, supporting teeth, protruding radially from the ring carrier, for arranging on rotor teeth of the laminated core, and collar-type end pieces, protruding axially from ends of the supporting teeth, for arranging on pole shoes of the rotor laminated core. The end pieces of the star disk and the support ring have mutually complementary bayonet joint regions, which are designed to connect the star disk and the support ring in a form-fitting manner.

Abstract: The manufacturing method of a rotor includes: a step of preparing a plate that is composed of an austenitic material and that has a projected portion and a part with a width in a rotational axis direction smaller than a width of the projected portion in the rotational axis direction; and a step of forming a welded portion across the projected portion of the plate and a rotation transmitting member by emitting an energy beam on at least a part of the projected portion to melt at least a part of the projected portion.

Abstract: A method of manufacturing a rotor includes forming plates each including a scrap portion that has a center hole and core plate portions that are disposed continuously with the scrap portion on an inner side of the center hole and that each defines a portion of a corresponding one of the outer cores forming a multilayer body including the outer cores by stacking the plates, setting at least a portion of the multilayer body and a portion of the inner core in a mold with a gap therebetween in the radial direction, forming a molded body by pouring a molten filling material into a gap in the mold and forming the filling section, at least a portion of the filling section being positioned between the outer cores, and separating the scrap portion and the core plate portions from each other.

Abstract: In one embodiment, a permanent magnet rotor is provided. The permanent magnet rotor includes at least one permanent magnet and a substantially cylindrical rotor core including an outer edge and an inner edge defining a central opening. The rotor core includes a radius R, at least one pole, and at least one radial aperture extending radially though the rotor core from the outer edge to a predetermined depth less than the radius. The at least one radial aperture is configured to receive the at least one permanent magnet. The rotor further includes at least one protrusion extending into the at least one radial aperture, the at least one protrusion positioned substantially along a bottom of the at least one radial aperture and configured to facilitate retention of the at least one permanent magnet within the at least one radial aperture.

Abstract: An apparatus for manufacturing a heat sealing-type rotational laminated core enabling the automatic separation of a laminated core, wherein the apparatus for manufacturing a laminated core includes: a squeeze ring installed on the lower portion of a blanking die for the blanking process; a heating means installed on the outer portion of the squeeze ring; a rotating die having the squeeze ring and the heating means installed therein to rotate by a predetermined pitch with the squeeze ring and the heating means; a vertically-moving die installed on one side of the blanking die and having a plurality of protruding portions and recessed portions formed; and a fixed die installed in the upper mold on the upper side of the vertically-moving die and having a plurality of recessed portions and protruding portions formed.

Abstract: The embodiments of the present disclosure provide a shaft structure of a motor, comprising a housing, a stator disposed inside the housing, and a rotor rotatably disposed inside the stator. The stator may comprise a stator core and a coil wound around the stator core, and the rotor may comprise a rotor core and a rotational shaft coupled to the rotor core. The rotational shaft may comprise a plurality of adjusting portions formed on an outer circumferential surface of the rotational shaft to align a center of gravity of the rotor with a center of the rotational shaft.

Abstract: To effectively cover a coil end with a resin layer. A method for manufacturing a stator includes a first resin layer forming step (ii) of forming a first thermoset resin layer by impregnating the tip end side of a coil end with first thermoset resin, the coil end protruding from the core of the stator, the first thermoset resin having liquidity; a second resin layer forming step (iii) of forming a second thermoset resin layer on the first thermoset resin layer by dropping second thermoset resin from the core side of the coil end toward the tip end side; and a curing step of curing the first thermoset resin and the second thermoset resin.

Abstract: In a case where a permanent magnet is inserted into each of a plurality of magnet-insert holes of a laminated iron core and then a resin is injected into the plurality of magnet-insert holes from a resin pool pot formed in one of an upper die and a lower die with the laminated iron core pinched and the resin is cured inside the plurality of magnet-insert holes to fix the permanent magnets to the laminated iron core, a dummy plate which abuts on the laminated iron core and includes a gate hole for allowing passage of the resin delivered from the resin pool pot and guiding the resin to the plurality of magnet-insert holes. The gate hole partially overlaps with at least two of the plurality of magnet-insert holes in a plan view of the dummy plate and the laminated iron core.

Abstract: An apparatus for automated encapsulation of motor rotor core with magnet steel is introduced. The apparatus includes at least one encapsulation unit, a plastic granule feeding device, a waste removing device, a conveyance device and a control device. Under a coordinated control of the control device, a rotor core feeding mechanism of the encapsulation unit feeds rotor cores to a plastic dispensing mechanism in cycles, the plastic granule feeding device separates, outputs and dispenses plastic granules, so that they are arrayed before being dispensed onto the rotor cores, and the conveyance device conveys plastic granules and moves the waste removing device to carry waste to a waste removal zone. With these arrangements, it is able to realize automated feeding of rotor cores, automated feeding of plastic granules and automated removal of waste to achieve completely automated rotor core encapsulation operation while enables mass production of motor rotor cores.

Abstract: A rotating electrical machine includes a rotor and a stator. A first end plate includes a first refrigerant discharge hole which communicates with a second refrigerant flow path hole and supplies refrigerant to a first coil end and a first groove portion which supplies the refrigerant supplied from a refrigerant flow path to a first refrigerant flow path hole and does not supply the refrigerant to the first refrigerant discharge hole and the second refrigerant flow path hole. A second end plate includes a second refrigerant discharge hole which supplies the refrigerant to a second coil end and a second groove portion which supplies the refrigerant supplied from the first refrigerant flow path hole to the second refrigerant flow path hole and supplies the refrigerant to the second refrigerant discharge hole.

Abstract: Provided is an IPM motor that is strong and has high output. An IPM motor has a rotor that includes a rotor core as a laminate of a plurality of metal foil pieces made of a soft magnetic material that are stacked in a direction of a rotation axis of the rotor. The rotor core has a plurality of through-holes that penetrates through the rotor core in the direction of the rotation axis, the plurality of through-holes including through-holes embedding magnets. The rotor core includes inner bridges and outer bridges. At least one of the inner bridges and the outer bridges of the rotor core is made of an amorphous soft magnetic material, and other parts are made of a nanocrystal soft magnetic material.

Abstract: An electric motor including two magnetic assemblies each having an even number of magnets in a circular arrangement, the magnets arranged in a bucking configuration with like poles directed at each other. There are a plurality of ferrous members for each of the magnetic assemblies arranged between each of the magnets. The ferrous members having a face that is directed radially toward a face of another ferrous member of the corresponding magnetic assembly. An electromagnetic assembly has a plurality of electromagnetic members arranged in a generally circular arrangement and is located radially between the two magnetic assemblies. Each electromagnetic member has a ferrous element with an electrical conductor wound around the ferrous element, each ferrous element having an inward and outward face respectively being directed to the ferrous members of the two magnetic assemblies as they pass each other as the magnet assemblies rotate relative to the electromagnetic assembly.

Abstract: A manufacturing method of a motor core includes laminating in an axial direction steel plates extending in a radial direction with respect to a central axis, each of the laminate steel plates including a base portion on a radially outer side of the central axis, annular portions separately disposed on a radially outer side of the base portion with penetrating portions therebetween, and connecting portions at predetermined intervals in a circumferential direction to extend in the radial direction and connect the base portion and the annular portions, the annular portions including coupling portions adjacent to both circumferential sides of the connecting portions, and cutting at least one of the two coupling portions adjacent to one connecting portion in the circumferential direction from an outer side to an inner side of the laminate steel plates in the radial direction with respect to the laminate steel plates that are laminated.

Abstract: A method of assembling an electric motor or generator having an annular first element mounted on a circumferential mounting surface of a second element, the method comprising placing a heating coil within an inner annular surface of the annular first element; applying a current to the heating coil to heat the inner annular surface of the annular first element to a temperature that results in the inner annular surface of the annular first element increasing in diameter to allow the annular first element to be mounted on or over the circumferential mounting surface of the second element; and cooling the annular first element to form an interference fit between the annular first element and the circumferential mounting surface of the second element.

Abstract: This method includes: a coil assembly step of combining a plurality of coil units to form a coil basket; a core insertion step of inserting inner cores of in the radial direction to the coil basket; and a fixation member insertion step of inserting a fixation member to the outer circumference of the inner core. In the core insertion step, the radial-direction position of the coil basket is retained at a core insertion time position shifted outward in the radial direction relative to a normal position after armature completion, and the inner cores are inserted in the radial direction to the coil basket. After the core insertion step, the radial-direction positions of the coil basket and the inner cores are moved inward in the radial direction to the normal position after armature completion.

Abstract: An electric machine includes at least one rotor module. A rotor module includes a rotor hub having a hub body, and a plurality of first protrusions and a plurality of second protrusions. One or more first protrusions include an elongated portion and a head portion. One or more second protrusions include a wedge-shaped profile. The rotor module further includes a magnetic core having a plurality of core members disposed on the rotor hub. A core member of the plurality of core members is disposed such that the head portion of the first protrusion located between the adjacent second protrusions engages with the core member, and each of the one or more second protrusions extends at least partially in a space between adjacent core members of the plurality of core members. Moreover, the rotor module includes a permanent magnet disposed in a space between the adjacent core members.

Abstract: A rotor of an electric motor includes a rotating shaft, a rotor core and a commutator fixed to the rotating shaft, and a first sleeve, a second sleeve and a third sleeve arranged around the rotating shaft. The first sleeve is located on a side of the rotor core away from the commutator and abuts against the rotor core, the second sleeve is located between the rotor core and the commutator, and the third sleeve is located on a side of the commutator away from the rotor core.

Abstract: An electrically-driven rotor iron core magnetic steel chamber dispensing device is introduced. Dispensing units each include a dispensing channel, dispensing head, plunger barrel, plunger and stop-injection opening pin. The dispensing channel is above the dispensing head and in communication with the dispensing head. The dispensing head is disposed at the top of the plunger barrel and in communication with the plunger barrel. The plunger is displaced in the plunger barrel to move up and down relative to the plunger barrel. The stop-injection opening pin includes a pin body disposed vertically, arranged beside the plunger barrel, and fixed to a lower mold from inside. A pin head portion is disposed at the top of the pin body. A barb is disposed between the pin head portion and the pin body. The pin head portion protrudes into the dispensing channel, allowing molten plastic in the dispensing channel to enter the barb.

Abstract: A hollow portion is formed in a holding jig. A first projection protrudes from a first inner side wall of the hollow portion. As the holding jig rotates to twist and bend a leg portion of a conductor, the projection bites into the leg portion.

Abstract: An electric motor includes an annular stator and a consequent-pole-type rotor including an annular rotor core disposed on the inner side of the stator and a plurality of permanent magnets disposed inside the rotor core and arrayed in a circumferential direction of the rotor core, in which the stator is covered with an unsaturated polyester resin.

Abstract: A method of forming a rotor lamination includes, with a laser, fabricating a first region of a lamination layer with a first powdered metal having a first composition. The first region at least partially defines a magnet pocket. The method further includes, with a laser, fabricating a second region of the lamination layer with a second powdered metal having a second composition different than the first composition. The second region is disposed immediately adjacent the first region.

Abstract: The present invention may provide a rotor comprising: a rotating shaft; a yoke surrounding the rotating shaft; and a magnet coupling to the outer side of the yoke, wherein the yoke comprises a flange part, wherein the flange part comprises a groove, and the magnet comprises a protrusion that is inserted in the groove.

Abstract: A method for manufacturing an induction rotor includes placing a lamination stack into a fixture in which the first end of the lamination stack is rotated in an opposite rotational direction from the second end of the lamination stack to skew the conduction bars to an angle ?. Vertical members are fixed to an outer perimeter of each of the plurality of laminates of the lamination stack. Hoop members are fixed to each of the plurality of vertical members and an outer edge of each of the plurality of conduction bars. A conduction ring is fixed on each of the ends of the lamination stack. An outer perimeter of the lamination stack is machined to remove the plurality of vertical members and the plurality of hoop members from the lamination stack.

Abstract: A rotary electric machine is equipped with a stator and a rotor. The rotor has a d-axis magnetic circuit that is produced by a magnetomotive force of a field winding, and magnet magnetic circuits that are produced by a magnetic force of permanent magnets. The d-axis magnetic circuit and a q-axis magnetic circuit have at least a part thereof that is common to both. The permeance of the d-axis magnetic circuit is smaller than the permeance of the q-axis magnetic circuit, when a load is being applied to the rotor. A control apparatus of the rotary electric machine has a switching circuit that controls the field current in the field winding, and a control section that makes the switching frequency of the switching circuit become higher when the field current is above a threshold value than when the field current is less than or equal to the threshold value.

Abstract: Embodiments of laminated stator cores suitable for usage in high temperature applications are provided, as are embodiments of methods for manufacturing high temperature laminated stator core. In one embodiment, the method includes obtaining a plurality of coated laminates each comprising a laminate over which a coating precursor layer is formed. The coating precursor layer contain inorganic dielectric particles having a softening point. The plurality of coated laminates are arranged in a laminate stack, which is then fired at temperatures equal to or greater than the softening point of the inorganic dielectric particles. During firing, a compressive force is applied to the laminate stack sufficient to consolidate the inorganic dielectric particles into a plurality of coherent interlaminate dielectric layers electrically insulating and bonding together the plurality of coated laminates as the high temperature laminated stator core.

Abstract: A squirrel-cage rotor having at least one laminated rotor core and a method of manufacturing the same are provided. Short-circuit rings in the squirrel-cage rotor are provided with at least two metal composite discs. A metal composite disc includes at least a first metal disc and a second metal disc connected to the first metal disc, where the second metal disc is made of a different material from the first metal disc. Adjacent metal composite discs are arranged such that the first metal discs face one another. The short-circuit rings are attached at an end face to the rotor core. Conductive rotor bars are attached to the first metal disc in the region of slots arranged in the outer periphery of the short-circuit rings.

Abstract: A motor for a surgical instrument includes a rotor and a stator. The rotor includes a shaft and a magnet. The stator includes (i) a cavity in which the rotor is disposed, and (ii) a coil assembly. The coil assembly includes multiple phase sets. The phase sets include multiple sets of wires. Each of the phase sets includes multiple coils and corresponds to a respective one of the sets of wires. The coils in each of the phase sets are at respective positions about the rotor. One of the sets of wires includes at least three wires. The stator causes the rotor to axially rotate a surgical tool of the surgical instrument based on current received at the sets of wires.

Abstract: A stator of the present invention includes: a stator core; a front housing which is arranged on a front end portion side of the stator core; and a back housing which is arranged on a back end portion side of the stator core, where the stator further includes: a first sealant which is individually provided between the stator core and the front housing and between the stator core and the back housing; and a second sealant which is provided so as to coat the outer side of the stator core in a radial direction with the first sealant, and the first sealant and the second sealant are formed of the same curable resin integrally with each other. A motor of the present invention includes the stator and a rotor which is supported on the inner side of the stator such that the stator can be rotated with respect to the stator.

Abstract: A rotor of a current-activated electric machine has a plurality of windings which are arranged on the rotor, slots being formed between the windings. A textile has a plurality of fibers connected to one another in flat contact. The textile is arranged in at least one slot, and the textile is impregnated with a filling material which in the normal operational state of the rotor is in a solid state.

Abstract: A method of manufacturing a rotor core having a plurality of core members stacked together includes determining weight imbalances for the plurality of core members with respect to a central axis of the rotor core; combining the weight imbalances of the plurality of core members to determine a weight distribution of the rotor core; and displacing the weight imbalances of one or more of the plurality of core members to adjust a position of the weight distribution of the rotor core with respect to the central axis.

Abstract: In an electrified vehicle having a synchronous traction motor, an inverter is connected to stator windings by three power cables. If these cables are accidentally connected to the wrong windings, the resulting torque will not match the desired torque, and may even be in the wrong direction. To avoid this problem, a test is performed any time that the cables may have been unplugged and re-connected. The inverter is commanded to generate a rotating magnetic field while the rotor is held stationary, resulting in a positive and a negative response current. A relationship between a phase angle of the negative response current and the rotor position indicates which cables are connected to which windings. If the cables are incorrectly connected, the controller disables the motor and informs an operator which cables to swap to achieve correct connection.

Abstract: A resin injection apparatus includes: a mold die and a receiving die configured to hold a core body in an axial direction of the core body, the core body having a resin formation region serving as a region where resin is to be formed by injection of molten resin; a plurality of plungers; and a pot group attached to the mold die, the pot group including a plurality of pots proximately located next to each other in a direction. Each of the plurality of pots has a through hole in which a corresponding plunger of the plungers is insertable. The plurality of pots have a first coefficient of thermal expansion that is lower than a second coefficient of thermal expansion of the mold die.

Abstract: Electrical machines, components thereof, and methods for manufacturing the same are provided. In one aspect, methods for additively manufacturing a rotor assembly for an electrical machine is provided. The method includes additively printing the rotor core and shaft of the same material composition. In another aspect, an electrical machine is provided. The electrical machine includes a stator assembly that includes a stator core having a plurality of poles with magnetic slot wedges positioned between adjacent poles to reduce tooth harmonics. The electrical machine also includes a rotor assembly having a rotor core that is formed as a solid core. In yet another aspect, a rotor assembly for an electrical machine is provided that includes slots that reduce eddy current losses in the rotor core during operation of the electrical machine.

Abstract: An electrically-driven rotor iron core magnetic steel chamber dispensing device effectuates dispensing in the gap between a magnetic steel chamber and a magnetic steel chunk of an electrically-driven rotor iron core. The electrically-driven rotor iron core magnetic steel chamber dispensing device includes a plurality of dispensing units each corresponding in position to one or more magnetic steel chambers. The dispensing units correspond in position to the magnetic steel chamber and are arranged in the circumferential direction of the electrically-driven rotor. The dispensing units are arranged outside the magnetic steel chamber and positioned proximate to the magnetic steel chamber or is located in the direction of the projection of the magnetic steel chamber. A dispensing opening of each dispensing unit corresponds in position to the magnetic steel chamber from below.

Abstract: An injection molding device includes: a lower die that supports a rotor core; an intermediate die including a magnetizing mechanism; and an upper die including an injection die having a gate formed therein through which a molten bonded-magnet material supplied from a supply source is injected into a magnet insertion hole in the rotor core. The injection die has a cylindrical protruding portion at an end surface of which the gate is open. In the protruding portion, a magnetic-flux applying member containing ferromagnetic material is embedded with its side surface exposed at an outer peripheral surface of the protruding portion. The magnetizing mechanism is formed in an annular shape that can accommodate, inside its inner periphery, the rotor core and a distal end portion of the protruding portion by disposing yokes and permanent magnets alternately in the circumferential direction. Magnetic-path surfaces of the yokes radially face the side surface.

Abstract: A rotor of a synchronous motor has a rotor core and a permanent magnet. The rotor core has a plurality of magnet insertion apertures and a plurality of slits. The permanent magnet is disposed in each of the magnet insertion apertures such that the magnetic poles of the permanent magnets are directed in a diameter direction. The slits are formed on an radially outer side of the magnet insertion aperture so as to align with intervals along a side of the permanent magnet. Magnetic paths are defined between adjacent slits. A gap that is a slot open in the axial direction of the rotor core is formed on the opposite side from a plurality of magnetic paths across the permanent magnet to adjust the magnetic resistance of the magnetic paths for making a change in magnetic flux between adjacent magnetic paths small.