Abstract: An electric machine comprise a first carrier having an array of electromagnetic elements and a second carrier having electromagnetic elements defining magnetic poles, the second carrier being arranged to move relative to the first carrier. An airgap is provided between the first carrier and the second carrier. The electromagnetic elements of the first carrier include posts, with slots between the posts, one or more electric conductors in each slot, the posts of the first carrier having a post height in mm. The first carrier and the second carrier together define a size of the electric machine. The magnetic poles having a pole pitch in mm. The size of the motor, pole pitch and post height are selected to fall within a region in a space defined by size, pole pitch and post height that provides a benefit in terms of force or torque per weight per excitation level.

Abstract: An electric machine comprise a first carrier having an array of electromagnetic elements and a second carrier having electromagnetic elements defining magnetic poles, the second carrier being arranged to move relative to the first carrier. An airgap is provided between the first carrier and the second carrier. The electromagnetic elements of the first carrier include posts, with slots between the posts, one or more electric conductors in each slot, the posts of the first carrier having a post height in mm. The first carrier and the second carrier together define a size of the electric machine. The magnetic poles having a pole pitch in mm. The size of the motor, pole pitch and post height are selected to fall within a region in a space defined by size, pole pitch and post height that provides a benefit in terms of force or torque per weight per excitation level.

Abstract: A method of attaching the adjustment mechanism of a linear actuator with the drive assembly of the linear actuator without the use of traditional assembly techniques such as threaded fasteners, welds or rivets, so that when the adjustment mechanism and drive assembly are aligned and assembled, they lock together.

Abstract: An electric compressor includes a motor, a scroll compression mechanism, a housing, a circuit unit, a circuit housing housing the circuit unit and integrated with the housing. The electric compressor includes a heat sink provided on a circuit unit side of a partition wall so as to project to be brought into contact with a semiconductor element of a power substrate, facing the partition wall that erects along a vertical direction to separate the inside of the housing from the circuit housing. The heat sink has a lower surface and an upper surface formed into a cylindrical shape so that width of an upper end portion and a lower end portion of the heat sink gradually decreases to reach a tip portion.

Abstract: A linear drive unit and a machine tool having the linear drive unit, capable of being applied to various applications, while taking into consideration the balance between the thrust force and the cogging of a linear motor. The linear drive unit has a magnetic gap changing mechanism which is configured to change a magnitude of a magnetic gap between a coil and a magnet, by displacing at least one of the coil and the magnet so that the coil and the magnet approach or are separated from each other.

Abstract: Provided is a rotor structure of a rotary electric machine, which is easily adaptable to offer a wide variety of products. The rotor structure of a rotary electric machine includes at least: a rotor shaft (3); a rotor core including a first rotor core section (15) and a second rotor core section (17); a boss section (9); and a pressurizing section. The second rotor core section and the boss section are arranged on an outer circumference of the rotor shaft. The first rotor core section is arranged on an outer circumference of the boss section. The pressurizing section is positioned on an axially outer side of the rotor core. The second rotor core section is pressurized by an abutment surface of the boss section. The first rotor core section arranged on the boss section is pressurized by the pressurizing section.

Abstract: Apparatuses, systems and methods are described for a flywheel system incorporating a rotor made from a high-strength material in an open-core flywheel architecture with a high-temperature superconductive (HTS) bearing technology to achieve the desired high energy density in the flywheel energy storage devices, to obtain superior results and performance, and that eliminates the material growth-matching problem and obviates radial growth and bending mode issues that otherwise occur at various high frequencies and speeds.

Abstract: The invention concerns a windmill including a rotatable transverse flux electrical machine (TFEM) comprising a stator portion; and a rotor portion rotatably located in respect with the stator portion, the rotor portion including an alternate sequence of magnets and concentrators radially disposed about a rotation axis thereof; the stator portion including at least one phase, the at least one phase including a plurality of cores cooperating with a coil disposed about the rotation axis, each core including a skewed pair of poles to progressively electromagnetically engage an electromagnetic field of respective cooperating concentrators. The invention is also concerned with a plurality of elements located in desired positions in the TFEM.

Abstract: A rotating electric machine includes a rotation body driven to rotate, an accommodation body housing the rotation body, a first power-supply member electrically connected to a positive electrode of a power source, a second power-supply member electrically connected to a negative electrode of the power source, an insulation layer contacting outer peripheral surfaces of the first and second power-supply members, and a conductive layer contacting the insulation layer on an opposite side of the insulation layer from the outer peripheral surfaces of the first and second power-supply members. The conductive layer is electrically connected to the accommodation body.

Abstract: A housing of a driving device, in particular an electric motor adjustment drive for a motor vehicle, has a housing opening, which is covered by a gas-permeable membrane, in particular a membrane that is impermeable to liquid. The housing opening is surrounded by a collar contour, which is interrupted locally at the circumference and within which the membrane lies.

Abstract: Embodiments of a gas turbine engine actuation system are provided, as are embodiments of a high temperature actuator and methods for the manufacture thereof. In one embodiment, the gas turbine engine actuation system includes an actuated gas turbine engine component and a high temperature actuator, which has a rotor mechanically linked to the actuated gas turbine engine component and a stator surrounding at least a portion of the rotor. The stator includes, in turn, a coil support structure having a plurality of spokes extending radially therefrom. A plurality of pre-formed electromagnetic coils is circumferentially distributed about the coil support structure. Each of the plurality of pre-formed electromagnetic coils is inserted over at least one of the plurality of spokes in a radial direction. The stator further includes an inorganic dielectric material in which each of the plurality of pre-formed electromagnetic coils is at least partially embedded.

Abstract: A resolver includes a first assembly having transmitter windings and a first winding of a first transformer. The resolver also includes a second assembly having receiver windings, a first winding of a second transformer, and a first winding of a third transformer. A third assembly of the resolver includes a second winding of the first transformer, a second winding of the second transformer, and a second winding of the third transformer. The three assemblies are rotatable relative to each other about an axis. The windings of the first transformer, the windings of the second transformer, the windings of the third transformer, the transmitter windings, and the receiver windings are arranged opposite each other in each case, separated by a radial gap.

Abstract: The present invention provides a shaft rotary type linear motor that enables a movable element to rotate and linearly move by using a simple structure, and can therefore support compact, space-saving and lightweight designs. The shaft rotary type linear motor includes: a shaft; an outer cylinder; a hollow movable element having a plurality of permanent magnets within the outer cylinder; an armature surrounding the hollow movable element and having a plurality of coils; and a frame containing the armature. The shaft is supported by a rotatable and linearly movable linear guide.

Abstract: A motor of a ceiling fan includes: a shaft having two shoulder surfaces facing in opposite axial directions of the shaft, with the shaft coupling with a stator; and a bearing sleeve receiving two bearings for supporting the shaft, with an annular flange formed at an end of the bearing sleeve. The annular flange and one of the shoulder surfaces of the shaft clamp and position one of the bearings. A rotor has a housing coupling with the bearing sleeve, with the housing having a connecting portion. The connecting portion and the other one of the shoulder surfaces of the shaft clamp and position the other one of the bearings.

Abstract: A stator for an electric motor includes a yoke and a star disposed in the yoke. The star is configured to receive a rotor therein and has at least one wire coiled thereat. The yoke and the star are configured such that the star is axially insertable into the yoke with reduced interference and reduced insertion force. The star is axially inserted into the yoke in an unlocked position. When the star is inserted into the yoke, the star is rotatable to a locked position, whereby the star is retained at the yoke via an interference fit.

Abstract: A rotor comprises laminations with a plurality of rotor bar slots with an asymmetric arrangement about the rotor. The laminations also have magnet slots equiangularly spaced about the rotor. The magnet slots extend near to the rotor outer diameter and have permanent magnets disposed in the magnet slots creating magnetic poles. The magnet slots may be formed longer than the permanent magnets disposed in the magnets slots and define one or more magnet slot apertures. The permanent magnets define a number of poles and a pole pitch. The rotor bar slots are spaced from adjacent magnet slots by a distance that is at least 4% of the pole pitch. Conductive material is disposed in the rotor bar slots, and in some embodiments, may be disposed in the magnet slot apertures.

Abstract: An electro-hydrodynamic system including an energy harvester and an adjustable member, wherein the energy harvester includes a charge source including: an injector configured to emit particles into a wind stream and an electrode configured to charge the particles to a first polarity and to generate a first electric field. The adjustable member supports the energy harvester, and is configured to control a distance between electrical ground and at least one component of the energy harvester. A method for controlling the electric field magnitude of an electro-hydrodynamic system including placing an energy harvester comprising a charge source at a distance away from electrical ground, the distance being an equilibrium distance; receiving a first measurement of a parameter indicative of electric field magnitude near the charge source; and in response to the first measurement surpassing a threshold, increasing the distance between the energy harvester and electrical ground.

Abstract: Provided is a pump that includes an annular molded stator having a substrate mounted with a Hall element and that includes a rotor having an annular rotor unit rotatably housed in a cup-shaped partition component, with one end thereof in an axial direction facing the Hall element and the other end thereof in the axial direction provided with an impeller attachment unit. The rotor unit includes a resin magnet, a sleeve bearing, and a resin portion. The resin magnet includes a rotor-position detecting magnetic-pole portion protruding axially with a predetermined height in an annular shape having a predetermined width in a radial direction on an outer periphery of an end face opposite to the Hall element. The rotor-position detecting magnetic-pole portion includes a plurality of arc-shaped notches on the same circumference on an inner diameter side thereof.

Abstract: An electrodynamic actuator (10), has a flat coil (24) formed by tracks (22, 23) on a face of a circuit board (16) and a permanent magnet (14) the magnetic field of which passes through turns of the flat coil (24).

Abstract: Reluctance-based resonant linear motors and methods of operation are provided. An example linear motor includes a spring having a plurality of coils. The linear motor includes a stator coaxially surrounding at least a portion of the spring. The stator includes a plurality of teeth. The linear motor includes a plurality of windings respectively positioned within a plurality of winding cavities respectively formed by the plurality of teeth. The application of electrical energy to the plurality of windings generates a magnetic field that flows through one or more of the coils of the spring. The flow of the magnetic field through the one or more coils of the spring causes the spring to actuate towards a compressed position. An example method includes periodically applying electrical energy to the plurality of windings such that the spring oscillates at a resonance frequency associated with the linear motor.