Abstract: Disclosed are a side-by-side phase winding, a stator and a motor. The side-by-side phase winding comprises two coil ring groups each consisting of Q coil rings, each coil ring being formed by connecting in series P hairpin conductor groups uniformly distributed in the circumferential direction; each hairpin conductor group comprises two hairpin conductors which are arranged in a staggered manner in the circumferential direction of the stator, each hairpin conductor comprises a hairpin main body which is integrally bent into a U-shape, the hairpin main body comprises two leg parts, a head part and support feet, and adjacent leg parts on the two hairpin conductors arranged in a staggered manner are located in two adjacent slots; and the Q coil rings in each coil ring group are arranged in Q circumferentially continuous adjacent slots of the stator.

Abstract: A motor includes a stator that includes a stator core and coils. The stator core is formed of a magnetic material and has a plurality of teeth arranged at intervals in a circumferential direction. The coils are formed of electrically-conductive windings wound around the teeth. Moreover, the motor also includes a rotor having a plurality of magnets arranged in radial opposition to the stator core and at intervals in the circumferential direction. The rotor is configured to rotate upon supply of electric current to the coils. Furthermore, the motor also includes a plurality of pseudo-teeth formed of a magnetic material and each located in a circumferentially intermediate area between a circumferentially-adjacent pair of the teeth. The pseudo-teeth are arranged so as to be concentrated in a part of the stator core in the circumferential direction.

Abstract: Disclosed is a stator assembly. By means of the process steps, such as unit body winding, multi-unit preparation, winding assembly and stator embedding, that are sequentially implemented, winding of a single unit body can be achieved by means of a single flat wire, winding of a stator winding can be completed merely by means of a bending process in a whole unit body structure.

Abstract: An electrical machine having a winding support having multiple grooves, which carries at least one winding. The winding is formed by a conductor which has multiple groove sections which each extend within one of the grooves of the winding support and which are conductively connected by connecting sections of the conductor, which are outside the grooves. The conductor has an insulation layer applied to the conductor at least in the groove sections. The insulation layer has layer thicknesses different from one another for at least two of the groove sections.

Abstract: The present disclosure provides a permanent-magnet fault-tolerant in-wheel motor based on an active sensorless strategy and drive and design methods thereof. The present disclosure proposes the permanent-magnet fault-tolerant in-wheel motor drive system based on an active sensorless strategy by considering sensorless operation performance in advance in a motor design stage. The present disclosure adopts fractional-slot concentrated windings, and ingeniously arranges alternating poles, a multi-layer magnetic barrier, and auxiliary permanent magnets, thus improving a sensorless operation accuracy of the motor while ensuring fault tolerance of the motor. The present disclosure proposes a frequency-band-adaptive secondary harmonic suppression strategy at a control layer to suppress an influence of a secondary salient harmonic on position observation and improve dynamic response performance of a system.

Abstract: A method is provided for producing a stator arrangement that has a stator core and a winding arrangement. The stator core has stator slots. The winding arrangement has winding elements with a conductor and an insulation layer. Each winding element has two interconnected winding element legs with two winding element end portions on each winding element leg. The method includes positioning the winding elements on the stator core so that the winding element legs extend through one of the stator slots with winding element end portions protruding on a first side of the stator core. The method then includes using a first laser arrangement to remove the insulation layer from regions of the winding element end portions. The method then includes pressing the first and second winding element end portions against one another and using a second laser arrangement to carry out welding.

Abstract: An embodiment relates to a stator and a motor comprising same, the stator comprising: a stator core comprising a yoke and multiple teeth protruding from the inner surface of the yoke; an insulator surrounding a part of the stator core; a coil wound around the insulator; and a molding portion disposed to cover the stator core, the insulator, and the coil. The insulator comprises a first insulator and a second insulator. The first insulator comprises: a body portion around which the coil is wound; and inner guide extending from the inside of the body portion in the perpendicular direction; a first outer guide extending from the outside of the body portion in the perpendicular direction; a second outer guide disposed to be spaced apart from the first outer guide in the outward direction; and a protrusion protruding from the second outer guide in the inward direction. The protrusion has an end portion disposed such that a predetermined gap (G) is formed between same and the first outer guide.

Abstract: A pump system for pumping production fluids from a wellbore or pumping well treatment fluids into a wellbore comprising: an axial flux electric motor; a seal section coupled to the axial flux motor; a pump intake coupled to the seal section; a pump coupled to the pump intake, and a fluid discharge coupled to the pump. The torque capacity axial flux motor may be modified without removing the axial flux motor from the pump.

Abstract: A pump system for pumping production fluids from a wellbore or pumping well treatment fluids into a wellbore comprising: an axial flux electric motor; a seal section coupled to the axial flux motor; a pump intake coupled to the seal section; a pump coupled to the pump intake, and a fluid discharge coupled to the pump. The torque capacity axial flux motor may be modified without removing the axial flux motor from the pump.

Abstract: A motor control device includes a motor, a drive circuit, a current detection unit, and a control unit. The motor has a plurality of phases of motor windings. The drive circuit is provided on a low potential side of the motor windings. The current detection unit has current detection resistors corresponding to each phase, and is provided on a low potential side of the drive circuit. The control unit includes an actuator control unit and an abnormality diagnosis unit. The abnormality diagnosis unit determines that the current detection unit is abnormal, when a difference between a maximum current, which is a maximum value of the phase current when a same duty ratio is commanded to each phase, and a minimum current, which is a minimum value of the phase current when a same duty ratio is commanded to each phase, is equal to or greater than an abnormality determination threshold.

Abstract: Provided is an electric generator including a stator including: a stator yoke a plurality of teeth, a plurality of slots extending radially from the stator yoke to respective radial slot ends, the plurality of slots being circumferentially interposed between the teeth of the stator, each slot including a bottom portion adjacent to the stator yoke and a top portion adjacent to the respective radial slot end. The stator further includes a plurality of coils housed in the plurality of slots, each slot housing at least one coil in the bottom portion and at least another coil in the top portion, each coil housed in the bottom portion of a first slot of the plurality of slots being connected to another respective coil housed in the top portion of a second slot of the plurality of slots.

Abstract: An electric motor polyphase winding pack includes a plurality of coiled conductors, each of the coiled conductors corresponding to a phase of a plurality of phases. Each of the coiled conductors has a first side and a second side. The coiled conductors are arranged in a sequence in which all of the first sides are disposed sequentially in a first layer, and all of the second sides are arranged in second layer disposed adjacent to the first layer, such that some of the first sides in the first layers and some of the second sides in the second layer correspond to each phase of the plurality of phases.

Abstract: An electric motor stator includes a magnetic circuit having a plurality of radial polar protuberances. The stator has, for all or some of said protuberances, a set of conductive zones in the general shape of a U, disposed around the protuberance, and the ends of each of the conductive zones are located in the vicinity of a common plane. The stator also has at least one connection component including a plurality of conductive tracks connected to distinct ends of said conductive zones, so as to define a DC electric circuit forming a winding around one or more radial polar protuberances.

Abstract: A 3-strand rotating field machine with a 2p-pole stator with winding teeth (Z), formed with a winding arrangement in tooth coil technology, has three winding strands (W1, W2, W3). The winding arrangement is formed from wound coil groups (G) with coils that are multiply interleaved. The partial coils (T) of the coil groups (G) are arranged so they concentrically enclose one another from inside to outside and surround two or more winding teeth (Z). The respective coil winding numbers in the grooves (N) between the winding teeth (Z) are provided. Thus, in each case a substantially equal occupancy of each groove (N) is provided with the same effective total conductor cross section of the coils per groove cross section.

Abstract: An electric motor has a stator defining multiple stator poles with associated electrical windings, and a rotor having multiple rotor poles. The rotor has flux barriers between adjacent rotor poles, the flux barriers each having a material with an electrical conductivity higher than the rotor pole material. The flux barriers are electrically isolated from one another external to the ferromagnetic material. Eddy currents are induced in the flux barrier to cause destructive interference of an impending magnetic field, such that the flux barrier effectively acts to inhibit magnetic flux during motor operation, which in some cases will result in a repulsive force that will act to increase an induced motive force on the rotor poles.

Abstract: A process for making a continuous bar winding (4) for an electric machine is described, comprising: a) a step of providing a template (10) having a template axis (X) and a circular array of slots (11) extended about said template axis (X), said circular array of slots having a number of slots equal to a number of slots of the stator or of the rotor of said electric machine, each slot (11) of said circular array having a first and a second open end face (11A, 11B) which are axially spaced from one another and a third open end face (11C), said third face (11C) being a longitudinal face extended between said first and second end faces (11A, 11B) b) a step of providing a conductive bar (20); c) a step of locking a locking portion (21) of said conductive bar; d) a step of inserting the conductive bar (20) into the slots (11) of said array and shaping the conductive bar (20) so that such conductive bar (20) repeatedly passes through the slots (11) of said array from the side of the first open end faces (11A) to the

Abstract: Systems, methods, and apparatus for secondary windings to modify a permanent magnet (PM) field of a permanent magnet synchronous generator (PMSG) are disclosed. In one or more embodiments, a disclosed system for a PMSG comprises a permanent magnet (PM) of the PMSG to rotate and to generate a permanent magnet field. The system further comprises a plurality of stator primary windings (SPW), of the PMSG, to generate primary currents from the permanent magnet field. Further, the system comprises a plurality of stator secondary windings (SSW), of the PMSG, to draw secondary currents from a power source, and to generate a stator secondary winding magnetic field from the secondary currents. In one or more embodiments, the permanent magnet field and the stator secondary winding magnetic field together create an overall magnetic field for the PMSG.

Abstract: A motor stator has a core and first, second and third hairpin wires. The core has slots, an insertion side and an extension side. Each first hairpin wire has its first hairpin first leg inserted into a third layer of the slots and its first hairpin second leg inserted into a sixth layer of the slots. Each second hairpin wire has its second hairpin first leg inserted into a fourth layer of the slots and its second hairpin second leg inserted into a fifth layer of the slots. Each third hairpin wire has its third hairpin first leg inserted into a first layer of the slots and its third hairpin second leg inserted into a second layer of the slots. At the extension side, a plurality of immediately-adjacent hairpin legs are connected to form first and second winding sets.

Abstract: A stator of an electrical machine which has stator slots and conductor elements arranged in the stator slots, which conductor elements each have two conductor ends, is already known. A plurality of conductor ends, which are situated next to one another, of different conductor elements are in each case connected to one another by means of a weld connection, which is provided at the end sides of the conductor ends in question, without additional material. The conductor ends which are connected to one another in each case form a common rectangular conductor cross section which has a height H and a width B, wherein the height H corresponds to the height h of an individual cross section of the conductor ends, and the width B of the common conductor cross section is made up of the sum of the widths b of the individual cross sections of the conductor ends. The weld connection is in each case provided, as seen in the direction of the width B, between two non-melted edge sections of the outermost conductor ends.

Abstract: Provided are a clamp jig for inhibiting an increase in the size of clamping equipment, and reducing the load during clamping by clamping after doing preliminary aligning of a segment end part; a stator manufacturing device; and a method for manufacturing a stator. The clamp jig 40 has a pair of clamp bodies 41, extended in a stator core radial direction, for clamping from both sides in the stator core circumferential direction the end part of an electric conductor, which is inserted in the stator core and welded; and a convex part 42 provided extending in the stator core axis direction at the bottom of the clamp body 41, the convex part being inserted between unwelded electric conductors.

Abstract: A stator member may include a columnar stator core, a linear coil, and an insulating insulator. The linear coil may be wound around the stator core. The insulator may be disposed between the stator core and the coil. Furthermore, the insulator may include a central member and an outer member. The central member may cover the stator core. The outer member may be connected to an outside of the central member in an axial direction of the stator core. The outer member may include a surface extending in a thickness direction in which the central member and the outer member are arranged, and a groove recessed in a direction orthogonal to the thickness direction from the surface. A connection terminal of a busbar member may be inserted into the groove.

Abstract: A three-phase electric machine includes a stator core defining slots, a terminal associated with one of the three phases, and a neutral. A first phase of hairpin windings is disposed in the core and has first and second parallel paths that are each continuous between the terminal and the neutral. The first path includes a first hairpin having a first leg disposed in a first of the slots and a second leg disposed in a second of the slots that is five slots away from the first slot. The first path further includes a second hairpin having a first leg disposed in a third of the slots and a second leg disposed in the second slot, wherein the second slot is seven slots away from the third slot.

Abstract: An electric machine having a stator with windings all having the same length. The stator includes a plurality of slots. A plurality of windings are mounted in the slots of the stator core and define a plurality of poles circumferentially distributed about the stator core. Each winding defines at least a first wrap and a second wrap wherein each of the first and second wraps circumscribes the stator core. Each of the first and second wraps includes a wire segment disposed in a slot in each pole. The first wrap of each winding is primarily disposed in one of the layers and the second wrap of each winding is primarily disposed in a different one of the layers. The first wrap of each winding defines a first linear length and the second wrap of each winding defines a second linear length that differs from the first linear length.

Abstract: A rotor for an electric machine of a vehicle. The rotor includes permanent magnets, receptions for the permanent magnets and deformation components. The permanent magnets are adapted to be deformed elastically and are arranged within the receptions, which are designed such that the permanent magnets may deform within the receptions. The deformation components are adapted to deform the permanent magnets such that at least one of a magnetic induction, a conductor length and a rotor radius is adjusted.

Abstract: A stator includes: a first wiring section connecting a coil wire end of a leading coil to a power line; and a second wiring section connecting a coil wire end of a last coil to a neutral point located on the power line side, by wiring that extends along a fewer-turns portion of the leading coil that has a smaller number of turns of wire than the last coil.

Abstract: A stator for an electric machine is formed in stratified layer forming a core having axial slots, and a plurality of hurdle-shaped conductors. Each conductor includes first and second uprights disposed in the slots, and a bridge connecting the uprights and extending circumferentially over a core end surface. The first upright is radially closer to a core central axis than the second upright. Each bridge steps radially outward from the first upright to the second upright. Radially adjacent bridges nest next to one another without crossing over one another. A junction between the first end of the bridge and the first upright defines a radially outward-facing ledge, and a junction between the second end and the second upright defines a radially inward-facing ledge. Each bridge passes over the outward-facing ledge of its radially inwardly adjacent conductor and passing over the inward-facing ledge of its radially outward adjacent conductor.

Abstract: Disclosed are a permanent magnet motor, a compressor and a refrigeration system. In the permanent magnet motor, the diameter D of a contour circle of the smallest inner periphery of a stator, the diameter d of a contour circle of the largest outer periphery of a rotor, the fundamental wave amplitude Bm1 of an air-gap flux density at an average gap between the stator and the rotor, the axial length L of the rotor, the total number of serially connected turns Ns of each phase winding, and a bus DC voltage Udc of a frequency converter supplying power to the permanent magnet motor before inversion are set as: 0.003 Udc?(D+d)×L×Bm1×Ns?0.008 Udc.

Abstract: The invention proposes a stator for a rotating electric machine, in particular for a motor vehicle, the stator (15) including: —a body (27) including notches (37) that are opened radially into an internal wall (40) of said body, —at least one winding (43) forming a phase of the stator, the winding formed from turns (54) includes a first half-phase (49) and a second half-phase (50) that are superposed radially in the notch (37), each turn including a series of axial strands (44) that are received in a series of associated notches and connecting strands (45, 46) that connect the successive axial strands (44) by extending alternatively to protrude with respect to the body (27). A length of wire of each turn of one of the half-phases is larger than the length of wire of each turn of the other half-phase. Furthermore, one of the half-phases has a number of turns higher than that of the other half-phase.

Abstract: This rotary electric machine rotor includes: a Lundell core that includes a cylindrical portion, a pair of yoke portions, and a plurality of claw-shaped magnetic pole portions; a bobbin that is mounted around an outer circumference of the cylindrical portion; a field coil that is wound onto the bobbin in multiple layers, the field coil contacting a vicinity of roots of inner circumferential surfaces of the claw-shaped magnetic pole portions; and a cooling fan that supplies air to an outer circumferential surface of the field coil, wherein the field coil is formed so as to have a peaked shape in which two or more peaks line up consecutively in an axial direction, an apex portion of each of the peaks being positioned radially further outward than a root position of the claw-shaped magnetic pole portions.

Abstract: The present invention relates to a rotor (1) of a rotary electric machine, comprising: a body (3) comprising a cylindrical central core (5) and a circumferential plurality of arms (B1 . . . B18) extending radially out from the cylindrical central core (5), the body (3) being intended to be mounted with the ability to move about an axis of rotation X, a coilset produced by windings of turns and forming at least one series of coils (C1 . . . C9, C1? . . . C9?), a coil (C1 . . . C9, C1? . . . C9?) comprising a predetermined number of turns around at least two arms (B1 . . . B18) of the body (3), two adjacent coils (C1 . . . C9, C1? . . . C9?) of a series being angularly offset from one another with a partial overlap, in which the last coil (C9, C9?), situated radially furthest towards the outside, comprises a predetermined number of turns that is lower than the predetermined number of turns of the other coils of the series (C1 . . . C8, C1? . . . C8?).

Abstract: A stator for an electric machine includes a stator carrier having a plurality of grooves with a respective groove base, and a motor winding having at least one first strand. A predetermined number of first grooves of the plurality of grooves is associated with the first strand. At least one coil section of the first strand is introduced into each of the first grooves. The first strand has a plurality of individual wires connected electrically in parallel, with each wire formed as a round wire. At least some of the individual wires in each of the coil sections are arranged above one another in a radial direction of the stator. The coil sections are each arranged in the first grooves in such a way that an average radial distance of the individual wires to the groove base is equal for all individual wires.

Abstract: A method and apparatus for cooling a rotor assembly for an inside-out electric machine includes an annular rotor core defining a set of rotor posts, the core rotatable about an axis of rotation, a set of windings wound around the respective set of rotor posts, and a wedge disposed between adjacent sets of rotor windings.

Abstract: In order to provide a rotary machine's stator that is capable of reducing the size of the coil ends and using a plurality of voltages without changing the winding arrangement, it is made to include a stator core (12) having a plurality of slots (14) provided along the circumferential direction, segments (22) that are composed of rectangular wires and received in the slots (14), and a distributed winding wire that is formed by arranging unit coils (21), each of which is made up of a plurality of the segments (22) disposed along the radial direction, in the circumferential direction of the stator core (12), and is made to form the unit coil (21) by connecting the segments (22) that are alternately and concentrically arranged in the radial direction with a plurality of slot pitches that are different from each other.

Abstract: An electric machine a stator having a stator core and windings positioned thereon. The stator core has a plurality of slots formed therein and a winding positioned in the plurality of slots. The winding includes at least four parallel paths distributed in slot sets of the stator core. Each slot set includes at least four contiguous slots including two left slots and two right slots. A first parallel path and a second parallel path are arranged in the two left slots for at least a first revolution of the winding around the core. The first parallel path and the second parallel path are arranged in the two right slots for at least a subsequent revolution of the winding around the core.

Abstract: A stator of the present invention includes a conductor wire. A portion of the conductor wire disposed adjacent to a coil winding center is connected to a power supply. A portion of the conductor wire disposed outwardly away from the coil winding center is connected to a neutral point.

Abstract: An insulating holder is provided with a bobbin portion and bus bar supporting portions, and the bus bar supporting portions have bus bar walls which electrically separate each of the bus bars, and step portions are formed, in a lamination direction of the bus bars, at the bus bar walls. Gap portions are formed, between the bus bars and the bus bar walls, in a longitudinal direction of the bus bars and in a lamination direction of the cores, at the step portion, and an insulating cap, which complements the gap portions from the outside and maintains the bus bars, is provided, in a state where the bus bars are installed to the bus bar walls.

Abstract: The present disclosure provides a linear vibration motor, including a base having a receiving space, a vibration unit located in the receiving space, an elastic member fixed to the base and suspending the vibration unit in the receiving space, and a coil fixed to the base and opposite to and spaced away from the vibration unit. The vibration unit includes a magnet, the magnet is opposite to and spaced away from the coil, the coil includes a first coil for connecting an electric signal and a second coil insulated from the first coil, and both ends of the second coil are connected to each other to form a closed loop. Compared with the related art, the linear vibration motor in the present disclosure has high reliability.

Abstract: A stator of a rotary electric machine related to the invention includes: a stator core in which a plurality of slots are formed and an opening part of each of the plurality of slots is provided in an inner circumferential surface thereof; and a coil including a plurality of coil segments that are inserted from the opening part of each of the plurality of slots. At least a first coil segment and a second coil segment are arranged so as to be overlapped in a radial direction in each slot, and an engagement part which prevents a relative movement in an axial direction is provided on overlapping surfaces of the first coil segment and the second coil segment.

Abstract: The present disclosure provides a vibration motor. The vibration motor includes a first vibrator and a second vibrator which perform relative moved. One of the first vibrator and the second vibrator is provided with a magnetic circuit, and the other one is provided with a coil corresponding to the magnetic circuit. The coil and the magnetic circuit interact to generate a driving force to drive the relative moved of the first vibrator and the second vibrator. A BL value of the magnetic circuit can be effectively improved, a better vibration feeling can be achieved, and the circuit reliability can be improved.

Abstract: The present invention is an electrical machine comprising a rotor (10) and a stator (12) having radial passages (28) arranged circumferentially along the stator, magnetic-flux generators (34) housed in the passages, and a stator bearing (24) containing the rotor. According to the invention, the radial passages (28) comprise fluid-circulation galleries (36) facing the magnetic-flux generators (34).

Abstract: An aircraft power generation unit to generate direct current (DC) power includes a flux regulated permanent magnet generator (PMG) that includes first through fourth sets of windings and a control coil and a rectifier section that include first through fourth six pulse rectifiers and a common local output bus. The unit also includes an output bus configured to be connected to the load and an H-bridge circuit connected across the output bus and outputs connected to the control coil. A controller receives an input signal from at least one of the windings and selectively couples either the common local output bus and fourth rectifier to the output bus negative rail and one or more of the first, second and third six-pulse rectifiers to the output bus to provide a constant voltage to the load.

Abstract: A stator assembly for a permanent magnet motor is disclosed. The assembly comprises a yoke comprising a plurality of teeth in connection therewith and extending into an opening formed by the yoke. The plurality of teeth comprises a first tooth and a second tooth. The first tooth is arranged adjacent to the second tooth about a rotational axis of the motor. The assembly further comprises a first coil and a second coil. The first coil comprises a first conductive winding having a first number of turns disposed around the first tooth, and the second coil comprises a second conductive winding having a second number of turns disposed around the second tooth. The first number of turns is different from the second number of turns.

Abstract: Stators are already known which in each case comprise an annular stator stack having grooves which are open towards an axis of the stator and in which an electrical winding is provided which comprises a plurality of winding branches. The plurality of winding branches each have a plurality of parallel wires for reducing the so-called skin effect. The parallel wires are arranged in the grooves, wherein the winding branches in their configuration each form a plurality of turns of a coil which are each part of an electrical coil, wherein a turn of a coil is formed in each case by two sides of a turn, lying in different grooves, of one of the winding branches and by a turn side connector which connects the two sides of a turn to one another. In electrical windings having parallel wires, an unfavourable wire position and a resulting linking of different magnetic flows may lead to disadvantageous compensating or circular currents which produce additional copper losses in the electric motor.

Abstract: A vehicle includes an electric machine having independently selectable delta and wye windings. The electric machine has a lower torque producing limit with one of the windings than an other of the windings at a given speed. The vehicle includes a controller configured to select the other of the windings such that torque of the electric machine increases without increasing the given speed. The selection is responsive to operating with the one of the windings and a torque demand greater than the lower torque producing limit.

Abstract: The present disclosure provides a vibration motor. The vibration motor includes a housing having a bottom wall and a side wall, a vibrator received in the housing, and an elastic member supporting vibration of the vibrator. The side wall includes a first side wall extending in a long axis direction of the vibration motor and a second side wall extending in a short axis direction of the vibration motor. The coil is disposed inclined to the first side wall. The vibration motor provided by the present disclosure can simultaneously provide driving forces in two directions of X and Y, achieves dual-f0 vibration output, and is simple in structure, so that not only the working band is effectively expanded, but also the vibration effect is enriched.

Abstract: An electric machine having a stator with windings all having the same length. The stator includes a plurality of slots. A plurality of windings are mounted in the slots of the stator core and define a plurality of poles circumferentially distributed about the stator core. Each winding defines at least a first wrap and a second wrap wherein each of the first and second wraps circumscribes the stator core. Each of the first and second wraps includes a wire segment disposed in a slot in each pole. The first wrap of each winding is primarily disposed in one of the layers and the second wrap of each winding is primarily disposed in a different one of the layers. The first wrap of each winding defines a first linear length and the second wrap of each winding defines a second linear length that differs from the first linear length.

Abstract: A rotating electric machine includes a pair of electric conductors for forming a coil and a weld. Each of the electric conductors has an end portion with an end surface. The weld is formed between the end portions of the electric conductors at the end surfaces of the end portions. Moreover, the end portions of the electric conductors are arranged so that parts of the end portions of the electric conductors adjoin each other. At least one of the end portions of the electric conductors has at least one slit formed therein to divide the end surface of the end portion into a plurality of sections. The weld is formed to cover, at least, the adjoining parts of the end portions of the electric conductors and the at least one slit.

Abstract: The ideal design for a fan with variable performance that can replace a family of current axial flow ducted, un-ducted, and centrifugal fan designs by meeting air flow and pressure requirements while drawing less electric current to rotate and thus produce the required flow not only would reduce cost of operation over the life of the fan but opens new possibilities for direct connection to solar collection systems by greatly extending the life of the battery charge employed by the designer of the collection system. In addition the entry of flying machines using pairs of lifting fans such as hover bikes and quadcopters, manned or unmanned is driving a need to re-examine the application of force applied to rotate these fans to achieve a reduction in aircraft weight and increase flying time for a given battery charge or load of fuel.

Abstract: A stator coil includes a plurality of flat wire-shaped coil pieces extending in a circumferential direction of a rotary electric machine at a position on an outer side of a stator core in an axial direction of the rotary electric machine. At the position on the outer side of the stator core in the axial direction, a distal end portion of one of the coil pieces, extending in a first direction in the circumferential direction, is joined with a distal end portion of another one of the coil pieces, extending in a second direction in the circumferential direction. The second direction in the circumferential direction is reverse to the first direction in the circumferential direction. An axially outer end face of the distal end portion of each coil piece is a circular arc face that is convex toward the outer side in the axial direction.

Abstract: A current controller calculates a drive signal by means of fundamental wave current control and high-order current control, for driving an inverter. A 5th order/7th order voltage command calculation section calculates a 5th order/7th order voltage command vector Vdk*, Vqk* by means of feedback control which makes a high-order dq transformation value extracted from the actual current coincide with a 5th order/7th order current command value Idk*, Iqk*.