Abstract: There is provided an intravascular blood pump for insertion into a patient's body. The system comprises a slotless motor having p magnet pole pairs and n phases, where p is an integer greater than zero, and n is an integer ?3. The motor comprises a stator winding having 2np coils wound to form two coils per phase per magnet pole pair such that a coil from each phase is circumferentially arranged next to a coil from a different phase in a sequential order of phase, the arrangement repeated along the stator winding such that each coil spans 360°/(2np) about the cross section of the stator winding. The motor also comprises a permanent magnet rotor supported for rotation and configured to generate a magnetic flux for interaction with the stator winding. The two coils per phase per magnet pole pair are connected in series.

Abstract: A motor controller integrated circuit (IC) includes a storage device containing software. The IC also includes a processor core coupled to the storage device. The processor core has an output adapted to be coupled to a motor. The processor core is configured to execute the software to implement a resonant controller at a frequency that is a harmonic of a speed of a motor.

Abstract: In one embodiment, a device identifies a potential change in user experience of an online application. The device selects, based on the potential change in user experience, a set of one or more users of the online application. The device obtains, from the set of one or more users of the online application, feedback regarding their experience with the online application. The device uses the feedback obtained from the set of one or more users of the online application to make a routing decision in a network regarding traffic of the online application.

Abstract: An electric motor and winding method that improves its characteristics of torque and speed. An improved electric motor that provides higher power density and safety features by a novel winding architecture. Since the new winding architecture does not affect the measures, design or materials of the electric motor there is no need for any special manufacturing process or extra cost. Therefore the improved electric motors are smaller, lighter and cheaper than the same power size conventional electric motors as in other prior arts. The improved electric motor provides redundancy features against failure.

Abstract: A method for controlling a synchronous double stator electric machine. A first stator and a first set of magnetic poles on a common rotor forms a first electric machine. A second stator and a second set of magnetic poles on the rotor forms a second electric machine. The first electric machine and the second electric machine is shifted mechanically by a predetermined angle. An electrical shift is produced to the control of at least the mechanically shifted electric machine with a respective frequency converter in order to at least partly compensate for the mechanical shift in the mechanically shifted electric machine.

Abstract: A single phase induction motor includes a stator core having a stator yoke and a plurality of teeth extending toward a central opening. The plurality of teeth are spaced apart from one another and define multiple slots between the teeth for receiving windings of the single phase induction motor. The stator core includes a high permeability low coreloss (HPLC) steel having a relative permeability of greater than or equal to 3000 at 1.5 Tesla and 60 Hertz, and a coreloss of less than or equal to 1.75 watts/lb at 1.5 Tesla and 60 Hertz. The motor also includes multiple windings located within the plurality of slots and wrapped around the plurality of teeth of the stator core. Each of the multiple windings include aluminum wire. The motor further includes a rotor body located concentrically within the stator core and including an external surface that faces the stator core.

Abstract: Aspects of the disclosure provide a sensing apparatus including a sensing device, a memory, and processing circuitry. The sensing device includes resonators having respective resonant frequencies. The resonators include an array of inductive coils positioned on a surface of the apparatus. The sensing device can output a signal indicating changes of the resonant frequencies caused by presence of an object proximate to the surface. The memory stores reference signals corresponding to reference objects. Each reference signal indicates changes of the resonant frequencies caused by the respective reference object proximate to the surface. The processing circuitry can receive, from the sensing device, a particular signal indicating changes of the resonant frequencies caused by presence of a particular object proximate to the surface. The processing circuitry compares the particular signal with the stored reference signals of the reference objects to determine an identity of the particular object.

Abstract: A field coil type rotating electric machine includes a stator and a rotor. The stator includes a stator core, stator teeth arranged in a circumferential direction and each radially protruding from the stator core, and a stator coil wound on the stator teeth. The rotor includes a rotor core, main poles arranged in the circumferential direction and each radially protruding from the rotor core, and a field coil wound on the main poles. Each of the stator teeth and the main poles extends in an axial direction. Each of the main poles has a pair of main-pole end portions located respectively at circumferential ends of the main pole and both radially facing the stator. For each of the main poles, in at least one of the main-pole end portions of the main pole, there is formed at least one cut for part of an axial length of the main pole.

Abstract: A coil includes: a series of turns constituted by a first turn to an n-th turn of a conductive wire having a polygonal cross-section, where n is an integer equal to or larger than 3, and the conductive wire is wound in a spiral shape and is stacked in a direction from downward toward upward; and an insulating member disposed on either an upper surface or a lower surface of an i-th turn, where i is an integer satisfying 1?i?n.

Abstract: A motor apparatus having a rotor that includes one or more permanent magnets disposed in ring-like manner, wherein similar poles of adjacent magnets face one another, and further wherein a gear mechanism (e.g., a toothed ring) is configured to transfer rotation from the rotor to an external gear mechanism. The motor may also include a stator comprising one or more solenoids and a bearing assembly that includes a rotating bearing element integrated with a toothed element for engaging with a gear and axle assembly. The rotating bearing element and integrated toothed gear element may pass through cavities of the main solenoids and provide for minimal cavity size, improving motor efficiencies.

Abstract: A motor stator (11) for a compressor, a permanent magnet motor (10), and a compressor (A) are disclosed. The stator (11) includes: a stator core (111); a stator winding (112), the stator winding (112) including a plurality of coil groups, and each coil group having at least two connectors (1124); a lead-out wire (113) used to connect an external circuit and the stator winding (112), there being a plurality of lead-out wires (113) and each lead-out wire (113) being connected to connectors of at least two different coil groups, wherein the rated voltage between terminals on which a motor is mounted is Un, the maximum outer diameter of the stator core (111) is Dmax, and the axial length of the stator core (111) is L, Un/(Dmax2×L)?0.3 V/cm3.

Abstract: A kitchen appliance has a control arrangement arranged to receive sound commands and to operate the appliance in response to the sound commands; a microphone arranged to receive sound comprising a sound command and to provide the sound to the control arrangement; and at least one acoustic filter configured to suppress from the sound provided to the control arrangement background noise created by operation of the kitchen appliance.

Abstract: The present invention relates to a stator. In a stator winding arrangement structure of a drive motor in which hairpin segments in a shape of a hairpin, each having two legs, are inserted into a stator core having a plurality of slots, and legs of the hairpin segments positioned opposite to the stator core are bent and joined to circuitry-form a serial coil bundle, a stator winding of the drive motor is composed of three or more phases and each of the phases consists of two or more successively adjacent slots. An arrangement structure of hairpin segments mounted in the stator core having a plurality of slots of a hairpin drive motor according to the present invention is modified to form a parallel circuit, and a coil extending over the same outermost layer is removed. In addition, structural stability and production yield of the hairpin segments may be improved.

Abstract: The present invention may provide a motor including a rotating shaft, a rotor coupled to the rotating shaft, and a stator disposed outside the rotor, wherein the stator includes a stator core having a plurality of teeth, and a coil wound around each tooth of the teeth, the coil is wound a plurality of turns around the tooth, and only the coil of (a*n+1)th turns among the plurality of turns forms a first layer closest to the tooth, wherein a is the number of total stacked layers of the coil, and n is zero or a positive integer.

Abstract: The present invention provides a shunt wound direct-current (DC) motor driving device and electrical equipment. The shunt wound DC motor driving device provided by the present invention includes a shunt wound DC motor, a DC power supply, and a chopper that converts a constant voltage into a variable voltage based on a control signal and provides the variable voltage for the shunt wound DC motor.

Abstract: A highly portable advanced adult and pediatric compact ECLS system is based around an integrated pump-oxygenator. The system includes a central a blood inlet and flow path extending along a general longitudinal axis of the system; a pump housing defining a pump inlet in fluid communication with the central blood flow path; an impeller rotationally received within the area of the pump inlet, wherein the impeller is magnetically supported and magnetically driven; an array of hollow fiber membranes configured for gas transfer within the system for oxygenation of blood flowing across the hollow fiber membranes, wherein the membranes include a covalently-bonded heparin-based bioactive surface, and wherein the blood flow path extends from the impeller to a position to flow perpendicular over the array of hollow fiber membranes; and a blood outlet configured to receive blood flowing past the array of hollow fiber membranes.

Abstract: A rotary electric machine includes: a rotor which has two poles, and a stator in which eighty four slots are formed, wherein conductors are connected in an order of a conductor X+1t, a conductor X?1b, a conductor X+3t, a conductor X?4b, a conductor X+6t, a conductor X?6b, a conductor X+8t, a conductor X?8b, a conductor X+10t, a conductor X?10b, a conductor X+11t, a conductor X?11b, a conductor X+13t, and a conductor X?13b, in first U, V and W phase series circuits; and conductors are connected in an order of a conductor X+2t, a conductor X?2b, a conductor X+4t, a conductor X?3b, a conductor X+5t, a conductor X?5b, a conductor X+7t, a conductor X?7b, a conductor X+9t, a conductor X?9b, a conductor X+12t, a conductor X?12b, a conductor X+14t, and a conductor X?14b, in second U, V and W phase series circuits.

Abstract: In a rotating electrical machine, of both ends of a stator winding of each phase, an end portion on a neutral point side is a first end portion, and an end portion on a connection point side of an upper arm switch and a lower arm switch of an inverter is a second end portion. The rotating electrical machine includes a neutral-point bus bar that electrically and mechanically connects the first end portions of the phases to one another. The first end portion and the second end portion of each phase is arranged in an end portion on a same side in an axial direction of a stator. The neutral-point bus bar and the second end portion of each phase are mechanically connected with an insulating sheet therebetween.

Abstract: The invention relates to a particularly redundant electrical machine (10) for driving a means of propulsion (1) with increased reliability. The machine (10) comprises a plurality of independent partial rotors (210, 220) which are respectively coupled to a common shaft (200) by means of freewheel devices (510, 520) in order to drive said shaft and the means of propulsion (1) therewith in a working direction of rotation. The machine (10) also comprises a plurality of independent stator winding systems (111, 121), a stator winding system (111, 121) and a partial rotor (210, 220) being respectively associated with each other and arranged in such a way that they can electromagnetically interact with each other. The stator winding systems (111, 121) are successively arranged in the axial direction. Similarly, the partial rotors (210, 220) are successively arranged in the axial direction.

Abstract: The present invention discloses a motor system without a hall sensing element. The motor system comprises a first output pin, a second output pin, an auxiliary pin, a stator, a rotor, a primary coil, and an auxiliary coil. Both the primary coil and the auxiliary coil surround the stator. The primary coil is coupled to the first output pin and the second output pin. The auxiliary coil is coupled to the auxiliary pin. The auxiliary coil is configured to determine a phase switching time point. The motor system detects the zero point of the voltage of the auxiliary pin, so as to detect the position of the rotor and determine the phase switching time point.

Abstract: A rotor lamination for a motor having a motor air gap width value is disclosed. The rotor lamination includes a main-body portion, a plurality of edges and a plurality of magnet-receiving slots. The main-body portion is centered at a central axis of the motor. The edges are disposed around outside of the main-body portion. The magnet-receiving slots accommodate a plurality of magnets of the motor and locate around the central axis. The magnet-receiving slot has a slot width value in an outward direction extending from the central axis. The magnet-receiving slot and the corresponding edge form a magnet depth value. The magnet depth value is greater than a sum value of a first rate constant multiplied by the slot width value and then subtracted the motor air gap width value, and is less than the sum value of the first rate constant multiplied by the slot width value and then plus the motor air gap width value.

Abstract: A stator assembly (50) includes a stator core (52) defining an outside diameter (OD) and an inside diameter (ID) with longitudinally extending slots (58) formed between the inside diameter and the outside diameter. The stator core (52) defines a core height extending longitudinally from a first end (53) to a second end (55) of the stator core (52). Distributed windings (60) are retained by the stator core (52) and include an in-slot portion (66) positioned in the slots of the stator core (52), a first end turn portion (62) adjacent to the first end (53) of the stator core, and a second end turn portion (64) adjacent to a second end (55) of the stator core. The first end turn portion (62) defines a first end turn height (h1) extending from the first end (53) of the stator core to a vertex (78) of the first end turn portion (62). A ratio of the first end turn height (h1) to the outside diameter (OD) of the stator core is less than or equal to 0.07.

Abstract: Described herein are fractional slot electric motors with compact crowns. A motor comprises multiple coil elements protruding through a stator core and forming electrical connections with each other and/or with a lead assembly. The lead assembly comprises phase busbars connected to selected coil elements and comprising terminals for connecting to an external power supply. The lead assembly also comprises neutral busbars, with no external connections and internally connected to other coil elements. Each coil element has a rectangular cross-sectional profile to maximize the slot-fill-ratio of the motor, Each coil element is electrically coupled to two other components. For example, each looped coil element is coupled to two other coil elements at a stator side, opposite the lead assembly. Each extended coil element is coupled to another coil element at that same side and coupled to another coil element or a busbar at the lead assembly side.

Abstract: A stator assembly includes a plurality of stator slots having multiple respective slot layers and a plurality of hairpins. The plurality of hairpins have a respective first leg positioned in one of the multiple respective slot layers and a respective second leg positioned in another of the multiple respective slot layers. A first set of n adjacent slots of the plurality of stator slots is configured to accommodate the plurality of hairpins carrying a current in a first phase, n being an integer. The plurality of hairpins is configured in respective conductor layers (L1, L2 . . . ) having a plurality of respective turn locations defining n respective turn positions. The plurality of hairpins is configured to occupy the n respective turn positions an equal number of times such that the respective conductor layers (L1, L2 . . . ) are electrically balanced.

Abstract: A stator of a drive motor is provided. The stator includes a stator coil having three phases and four parallels; a stator core having eight poles and 48 slots; a sixth slot being set as a draw out slot of U phase; a ninth slot being set as a draw out slot of V phase; a twelfth slot being set as a draw out slot of W phase; U1, U3, V1, V4, W1 and W4 phases, a winding draw out direction of which is a clockwise direction; and U2, U4, V2, V3, W2 and W3 phases, a winding draw out direction of which is a counter-anticlockwise direction.

Abstract: A terminal connection of a rotary electromagnetic device and a method of connecting a terminal to an aluminum stator wire of the rotary electromagnetic device without changing stator configuration is described. A de-insulated portion at one of ends of the stator wire is connected to a small connection wire made of copper by ultrasonic welding to form a mutually welded stator wire and connection wire portion. The mutually welded stator wire and connection wire portion are soldered to the terminal to, therefore, form an electric connection between the stator wire and the terminal.

Abstract: An electric machine includes a stator core defining slots and hairpins disposed in the slots and selectively joined at connections to form windings. A U-shaped jumper has spaced legs interconnected by a U-portion. The legs are attached to a pair of the hairpins at a location radially outboard of the slots such that the U-portion faces the core. A terminal lead of the windings radially extends between the legs.

Abstract: An electrical machine with a rotor and a stator. The rotor or the stator has at least one coil with a coil core and a coil winding, which surrounds the coil core. The coil winding has at least one turn that is formed from a flat conductor, which is bent a around a plurality of bending axes, which are spaced apart from one another and are parallel, and, as viewed in section, is S-shaped and/or has a meandering shape. The flat conductor has a plurality of layers that are insulated from one another, at least in regions, and/or a plurality of slot-shaped recesses.

Abstract: A unit coil includes: first, second, third, and fourth turn portions extending in a bent manner from first, second, third, and fourth slot accommodation portions and each connecting the slot accommodation portions to each other; and first, second, third, and fourth leg portions. Recesses are formed in surfaces opposed to each other at bent parts of the turn portions or bent parts of the turn portion and the leg portion, that extend in a bent manner toward the same side in the circumferential direction from the slot accommodation portions adjacent to each other in the radial direction.

Abstract: A multi-phase electric machine having plurality of windings are mounted on the stator core that define a plurality of phases wherein, for each phase, the windings include at least two parallel windings, each winding comprising a pair of continuous wires which are connected in series. For each pole, the parallel windings fill one or more central slots and two outer slots. Each winding fills each central slot twice the number of times that the winding fills each outer slot to thereby define a slot fill ratio of 2:1 between central slots and outer slots and wherein each wire of the wire pair forming a winding fills the slots in a ratio that differs from the slot fill ratio. Phase shift end loops shift the windings from one outer slot to the other outer slot. Position change end loops alter the relative positions of the parallel windings.

Abstract: The invention relates to an electric asynchronous machine (1), in particular an induction machine, comprising: —a cylindrical stator (2) with stator teeth (22) on a stator yoke (21), wherein a ratio between a yoke height (hy1) of the stator yoke (21) in the radial direction and a groove height (hn1) of the stator grooves (23) in the radial direction ranges from 1.75 to 2.5; —a cylindrical rotor (4) with poles (42) on a rotor yoke which are defined by short-circuit windings in a rotor body (41), wherein a ratio between the yoke height of the rotor body (41) in the radial direction and the groove height of the rotor grooves in the radial direction ranges from 2 to 2.75.

Abstract: The present teaching relates to a magnetic sensor residing in a housing. The magnetic sensor includes an input port and an output port, both extending from the housing, wherein the input port is to be connected to an external alternating current (AC) power supply. The magnetic sensor also includes an electric circuit which comprises an output control circuit coupled with the output port and configured to be at least responsive to a magnetic induction signal and the external AC power supply to control the magnetic sensor to operate in a state in which a load current flows through the output port. The magnetic induction signal is indicative of at least one characteristic of an external magnetic field detected by the electrical circuit and the operating frequency of the magnetic sensor is positively proportional to the frequency of the external AC power supply.

Abstract: A field winding type rotating electric machine includes: a stator armature winding wound on a stator core; a rotor field winding wound on a rotor core; a rectifying element connected to both ends of the rotor field winding; a capacitor having one end connected to one end of the rectifying element and the other end connected between the two ends of the rotor field winding; and a control circuit configured to supply electric current, which includes a fundamental component for generating rotational torque and a harmonic component having a shorter period than the fundamental component and superimposed on the fundamental component, to the stator armature winding and thereby induce excitation current in the rotor field winding. Moreover, an inductance of the rotor field winding and a capacitance of the capacitor are in a resonant relationship with a frequency of the harmonic component.

Abstract: A rotating electric machine includes: a stator core having a plurality of slots aligned along a circumferential direction; a stator having a stator coil with an enamel coating inserted into the slots of the stator core; and a rotor rotatably arranged over the stator core through a given gap. The stator coil includes: main coils of a plurality of phases in which a plurality of segment coils each having a rectangular cross-section wire formed into a substantially U-shaped wire in advance is connected to each other; a first sub-coil having a lead wire led from the slots and attached with an AC terminal, and connected to one end of the respective main coils; and a second sub-coil having a neutral wire led from the slots, and connected to the other end of the respective main coils. The lead wire and the neutral wire are each formed of a wire with a bend structure having a plurality of straights and bends.

Abstract: A method of manufacturing a high-density coil formed by press working a coil to cope with the manufacture of high-density coils having various cross-sectional shapes. The method includes: a step of setting the coil at a predetermined press working position in a press working machine; and a step of sequential press working the coil, which is set at the predetermined press working position, in a plurality of directions sequentially with a time lag.

Abstract: A brushless electric motorsystem having integrated power stages, said electric motor system comprising a rotor, a stator, a plurality of power stages, and a cooling system comprising a substantially flat hollow main cool body arranged to support the flowing of a cooling medium inside said hollow main cool body for cooling said main cool body, a base cooling plate connected to a first flat surface of said hollow main cool body and to said plurality of power stages for transferring heat between said plurality of power stages and said base cool plate, heat resistance inserts connected to said base cooling plate and said plurality of electrically excitable coils for transferring heat between said plurality of coils and said base cooling plate wherein said heat resistance inserts provide for a thermal conductivity, thereby creating a thermal buffer such that said electrically excitable coils are cooled less compared to said power stages, by said cooling system.

Abstract: A stator for an electric machine includes a generally cylindrical stator core having a plurality of circumferentially-spaced and axially-extending core teeth that define a plurality of circumferentially-spaced and axially-extending core slots in a surface thereof, a main winding having a plurality of coils, each of the coils including a plurality of turns occupying the plurality of slots in the stator core, and a tertiary excitation winding having a plurality of coils, each of the coils including a single turn occupying at least a subset of the plurality of slots in the stator core. The coils of the main winding are unevenly arranged in the plurality of slots.

Abstract: A stator includes a stator core having slots, a stator coil comprised of three phase windings, phase busbars each electrically connecting a corresponding one of the phase windings to an inverter, and a neutral busbar star-connecting the phase windings to define a neutral point therebetween. In each of the slots of the stator core, there are arranged K in-slot portions of the phase windings of the stator coil in K layers so as to be radially aligned with each other, where K is an even number. The phase and neutral busbars are electrically connected with those in-slot portions of the phase windings of the stator coil which are arranged at the radially outermost layer or the radially innermost layer in the respective slots of the stator core so as to be circumferentially spaced from one another by M slot-pitches or more, where M is a slot multiplier number.

Abstract: A magnetic sensor integrated circuit, a motor component and an application apparatus are provided. The integrated circuit includes: an input port, an output port, a magnetic field detection circuit and an output control circuit. The magnetic field detection circuit detects an external magnetic field and outputs magnetic field detection information. The output control circuit enables, at least based on the magnetic field detection information, the integrated circuit to switch at least between a first state, in which a current flows from the output port to an outside of the integrated circuit, and a second state, in which a current flows from the outside of the integrated circuit to the output port.

Abstract: The present disclosure provides a stator of a drive motor including: a stator coil having three phases (U, V, W) and four parallels (U1˜U4, V1˜V4, W1˜W4); a stator core having eight poles and 48 slots, where the stator coil is inserted into a slot configured by four pitches along a clockwise direction in the stator core; a first slot being set as a slot that U1 phase is inserted into; a sixth slot being set as a draw out slot of U phase; a ninth slot being set as a draw out slot of V phase; a twelfth slot being set as a draw out slot of W phase; U1, U3, V1, V4, W1 and W4 phases, a winding draw out direction of which is a clockwise direction; and U2, U4, V2, V3, W2 and W3 phases, a winding draw out direction of which is a counter-anticlockwise direction.

Abstract: A stator is provided for a multiphase electric motor. The stator has a stator core having a multiplicity of stator teeth situated along a circumference of the stator core, coils wound on the stator teeth, and a multiplicity of connecting terminals for contacting the electric motor in a delta connection, with a parallel circuit of the coils per phase. Here, a respective winding wire of the coils is connected directly to the connecting terminal at each connecting terminal. In addition, a multiplicity of coils is connected in parallel to at least one of the connecting terminals, and the connecting terminals are provided for at least one of the phases in each case as a terminal pair made up of a main terminal and a secondary terminal connected to the main terminal by an electrically conductive connecting piece. In addition, an associated winding method is described.

Abstract: An object of the present invention is to obtain a wiring board that achieves both of high mounting position accuracy and high solder strength in a circumferential direction. On the wiring board, an electronic component including a plurality of pins is mounted. The wiring board includes a base substrate, a plurality of wires provided on the base substrate, a resist covering the wires, and a plurality of footprints connected to the wires and having entire surfaces exposed in openings of the resist. The pins are soldered to the footprints by reflow. In the openings of the resist, directions in which the pins are led out are parallel to directions in which the wires are led out.

Abstract: A stator for an electric motor may have a substantially annular shape centered around a central axis and may include a stator core having a plurality of teeth consecutively arranged in a circumferential direction, and a plurality of coils wound around respective teeth of the plurality of teeth. The plurality of coils may be grouped into a plurality of phase groups. The stator may include in association with the respective phase groups: at least one loop wire connecting at least two coils of the respective phase group in series with each other with the at least one loop wire being positioned at a radially inner portion of the stator, and at least two end wires respectively connected to two end coils of the respective phase group. The at least two end wires may be configured to be connected to a power source to energize the coils of the respective phase group.

Abstract: A brushless direct current electric motor includes a first sub-motor and a second sub-motor. The first sub-motor and the second sub-motor share a common rotor, and each comprises an independent stator. The stators of each sub-motor comprises a plurality of teeth and a plurality of windings. The teeth of the first sub-motor and the teeth of the second sub-motor are interleavingly arranged in a circumferential direction or arranged side by side in an axial direction. The first sub-motor and the second sub-motor are configured to cooperatively work as a single electric motor to output a normal power. When one of the sub-motors breaks down, the other sub-motor can be operated independently to enhance reliability and safety of the brushless direct current electric motor.

Abstract: A submersed electric motor includes a stator assembly arranged within an annular insulation chamber, and a stator with stator windings and a capacitive electric starter which is connected electrically thereto. The insulation chamber is formed between an outer tubular jacket, an inner tubular jacket, which is coaxial to the outer tubular jacket, with two annular end covers adapted to close the annular interspace between the outer jacket and the inner jacket. The submersed electric motor further includes a rotor arranged inside the inner tubular jacket. The capacitive electric starter includes at least two capacitors, which are mutually complementary, and have a transverse cross-section with an arc-like profile and are connected in parallel to each other.

Abstract: Electric motor systems and methods may provide highly efficient operation. The electric motor systems and methods discussed herein provide an oil filled motor that is low speed and utilizes permanent magnets. The electric motor may utilize a large number of poles and fractional slot design. Further, in some embodiments, the electric motor systems and methods may be suitable for use downhole.

Abstract: An electric power tool 1 has a motor 3, a housing 2, a power cord 9, and a power supply control circuit portion 8. The housing 2 has a body portion 21 for accommodating the motor, a substrate accommodating portion 23 for accommodating a substrate on which a control substrate for operating the motor 3 is mounted, a handle portion 22 having one end connected to the body portion 21 and another end connected to the substrate accommodating portion 23. The power cord 9 extends from the substrate accommodating portion 23 and is connected to an AC power supply. The power supply circuit portion 8 has a choke coil 86 and a film capacitor 88 for filtering noise, and converts AC power supplied through the power cord 9 to DC power. The choke coil 86 and a film capacitor 88 are accommodated in the substrate accommodating portion 23. Accordingly, the handle portion can be formed shorter, and assemblability of the electric power tool can be improved.

Abstract: A stator includes a stator core having slots arranged in a circumferential direction and a stator coil formed by wave-winding continuous coil wires on the stator core. Each of the continuous coil wires has in-slot portions received in the slots and turn portions each of which connects, on the outside of the slots, one pair of the in-slot portions. The stator coil is formed, by spirally rolling a band-shaped coil wire bundle that is formed by bundling the continuous coil wires, into a cylindrical shape. In the coil wire bundle, the continuous coil wires are transposed at a plurality of locations. Moreover, in a range where the continuous coil wires extend in the circumferential direction of the stator core by one complete turn, at least one interval between adjacent transposition locations in the coil wire bundle is greater than or equal to the circumferential length of one turn portion.

Abstract: A stator includes a stator core having slots, a stator coil comprised of three phase windings, phase busbars each electrically connecting a corresponding one of the phase windings to an inverter, and a neutral busbar star-connecting the phase windings to define a neutral point therebetween. In each of the slots of the stator core, there are arranged K in-slot portions of the phase windings of the stator coil in K layers so as to be radially aligned with each other, where K is an even number. The phase and neutral busbars are electrically connected with those in-slot portions of the phase windings of the stator coil which are arranged at the radially outermost layer or the radially innermost layer in the respective slots of the stator core so as to be circumferentially spaced from one another by M slot-pitches or more, where M is a slot multiplier number.

Abstract: Provided is a stacking-type stator using a multilayer printed circuit board (PCB) in which torque generation can be maximized in an opposite rotor, and a single-phase motor and a cooling fan both using the same. The stacking-type stator includes: a multilayer printed circuit board (PCB) that is stacked and integrated with a penetration opening; and a coil pattern patterned on each layer of the multilayer PCB, wherein throughholes are formed to penetrate the multilayer PCB and connect the coil patterns, wherein the coil pattern comprises: inner and outer rotating direction pattern portions which are arranged in a circumferential direction at intervals along an inner circumference and an outer circumference concentrically with the penetration opening; and a radial pattern portion that interconnects the inner rotating direction pattern portion and the outer rotating direction pattern portion that are adjacent to each other and is disposed along the radial direction.