Abstract: A drive motor for vehicles includes: a stator; a rotor rotatably disposed inside the stator; a hollow shaft disposed inside the rotor, configured to be rotatable with the rotor and including a plurality of through-holes; and a housing configured to accommodate the stator, the rotor, and the hollow shaft, and including a channel, wherein the channel is formed in an inner wall of the housing and is configured to allow an upper side of the inner wall and an interior of the hollow shaft to communicate with each other and allow oil flow therein.

Abstract: The present disclosure relates to a rotor assembly and a motor including the same. The rotor assembly according to the present disclosure includes a rotor core having a through-hole formed through a central portion thereof in an axial direction of the rotor core, and a rotor shaft that is coupled to the rotor core through the through-hole and that has a hollow into which a cooling fluid is introduced. A cooling fin protrudes from an inner circumferential surface of the rotor core toward the rotor shaft to form, between the rotor core and the rotor shaft, a rotor cooling channel through which the cooling fluid flows.

Abstract: An electric machine includes a housing, a stator, an oil film, and at least one first seal. The housing has an internal surface defining an internal cavity. The stator has an outer peripheral surface and is disposed within the internal cavity such that a clearance gap is defined between an outer peripheral surface and the internal surface. The oil film is disposed within the clearance gap and is in contact with the internal surface and the outer peripheral surface. The at least one first seal is disposed along a first end of the stator and is configured to retain the oil film within the clearance gap along the first end of the stator.

Abstract: A motor device includes a motor, an input unit, a processing unit, and an electrical energy storage unit. The input unit accepts power supplied from a controller during a first period and receives at least a communication signal transmitted from the controller during a second period after the first period. The processing unit updates data for the motor in accordance with the communication signal received by the input unit. The electrical energy storage unit stores, based on the power supplied to the input unit, electrical energy for driving the processing unit.

Abstract: A cooling crescent for a hybrid module includes a first half section and a second half section. The first half section has a radially outer inlet orifice and a plurality of circumferentially disposed radially inner outlet orifices. The second half section is sealed to the first half section to form a narrow channel hydraulically connected to the radially outer inlet orifice, and a circumferentially extending channel hydraulically connected to the narrow channel and the plurality of circumferentially disposed radially inner outlet orifices. In some example embodiments, the first half section or the second half section comprises a plurality of axially extending tabs with respective orifices for fixing the cooling crescent to a housing of the hybrid module. In an embodiment, the plurality of axially extending tabs are configured to be adjustable to vary a respective height of the tabs to accommodate for e-motor stators of varying sizes.

Abstract: A linear resonant actuator includes a ferritic tube, a movable mass, first and second flexures, and a set of one or more flexures. The ferritic tube has an axis extending from a first end of the ferritic tube to a second end of the ferritic tube. The movable mass has a set of magnet sections disposed along the axis. First and second flexures mechanically couple first and second ends of the movable mass to the ferritic tube. The flexures suspend the movable mass within the ferritic tube and allow movement of the movable mass along the axis. The electric coil(s) are attached to the ferritic tube and extend around the movable mass, between the ferritic tube and the movable mass. Each magnet section has magnetic poles disposed at different positions along the axis, and like magnetic poles of adjacent magnetic sections face each other.

Abstract: Aircraft electric motors are described. The aircraft electric motors include a cooling system comprising an annular heat exchanger, a motor housing arranged radially inward from the heat exchanger, the motor housing defining a rotor-stator cavity and a gear assembly cavity, a rotor sleeve arranged within the rotor-stator cavity, a gear assembly arranged within the gear assembly cavity, a first shaft operably coupled to the rotor sleeve and configured to be rotationally driven by the rotor sleeve to drive rotation of a portion of the gear assembly, and a second shaft operably coupled to the gear assembly and configured to be rotationally driven by the gear assembly.

Abstract: A stator includes a stator core including a plurality of teeth and a plurality of slots, a coil wound around the plurality of slots, and a spacer disposed on an end portion in an axial direction of the stator core. The coil includes a plurality of coil segments, each including a bent portion and a pair of legs. The spacer includes a coil support portion that is disposed between an end portion of each of the teeth and the bent portion of the coil segment and that has a support surface. A distance from the end portion of each of the teeth to the support surface on an inner side in a radial direction of the stator core is longer than a distance from the end portion of each of the teeth to the support surface on an outer side in the radial direction of the stator core.

Abstract: An electrical generator system is provided with a housing. A first rotor is on the housing for rotation relative to the housing in response to fluid flow through the first rotor. A second rotor is on the housing for rotation relative to the housing in response to fluid flow through the second rotor. A first armature is driven for rotation by the first rotor for rotation in a first rotary direction. A second armature is oriented coaxial with the first armature and driven for rotation by the second rotor for rotation in a second rotary direction that is opposite to the first rotary direction to generate electricity.

Abstract: A slip ring, in particular for use in a wind turbine, includes an axle extending in an axial direction and a contact region having a contact surface on a peripheral surface of the contact region and a recess extending in a tangential circumferential direction along the peripheral surface. The contact region includes an axial end face formed with an opening which communicates with the recess. The contact region includes three essentially cylindrical segments which define two covering segments and an intermediate segment arranged in a center between the two covering segment. Each of the two covering segments defines a radius which is larger than a radius of the intermediate segment so that a peripheral surface of the intermediate segment forms an underside of the recess. An insulating region is arranged adjacent to the contact region on the axle.

Abstract: A brushless direct-current speed regulation switch with a highly integrated structure. The brushless direct-current speed regulation switch comprises a base body, a bottom cover and a push shaft; a moving contact assembly in contact with the push shaft is arranged below the push shaft, a moving elastic sheet, a moving contact support for supporting the moving contact assembly and a static contact pin assembly matched with the moving contact assembly are arranged below the moving contact assembly, one end of the moving elastic sheet is connected with the moving contact assembly, and the other end of the moving elastic sheet is connected with the moving contact support; a circuit board assembly is arranged on one side of the push shaft, and a connecting reed and a speed regulation reed which can slide on the circuit board assembly are arranged between the circuit board assembly and the push shaft.

Abstract: Systems and methods for hoisting a top drive of a drilling rig. An example system includes a hoisting system having a linear electric motor operable to raise and lower the top drive. An example method includes commencing operation of a processing device to cause operation of the linear electric motor to raise and lower the top drive. The linear electric motor may have a stator connected to and extending vertically along a mast of the drilling rig, and a rotor connected to the top drive and operable to move relative to the stator. The rotor may be connected to the top drive via one or more flexible lines.

Abstract: An electric machine has a stator, a rotor, and a slip ring module which is connected to a motor shaft of the electric machine. The slip ring module is equipped with at least one wire guiding channel, through which a respective contact wire is guided in order to electrically connect a rotor winding to a slip ring. A first section of the wire guiding channel runs from the slip ring in the axial direction parallel to the motor shaft. A second section of the wire guiding channel runs adjacently thereto radially outwards. An elastic seal element which surrounds the respective contact wire is arranged in or on the second section in order to seal the wire guiding channel to prevent a lubricant from entering the channel.

Abstract: The present invention provides a vibration motor including an installation housing having a through opening; a vibrator; an elastic member suspending the vibrator; a stator; a magnet; a coil; and a flexible circuit board. The flexible circuit board includes a first conduction part, a second conduction part, and a bending part. The vibration motor further comprises a connection bracket having a first connection part connected to the vibrator and a second connection part connected to the elastic member. By virtue of the configuration described in the invention, the assembly accuracy of the vibration motor is ensured.

Abstract: Aspects of the disclosure relate to electrically driven power end apparatus and methods, and associated components thereof. In one implementation, a power end for a pump includes a crankshaft coupled to a plurality of actuation rods, and a motor. The motor includes a rotor coupled to the crankshaft. The rotor includes a plurality of electrical coils wound at least partially around the rotor. The motor includes a stator disposed radially outside the rotor, and the stator includes one or more magnets. The plurality of electrical coils apply a magnetic force to the rotor to turn the crankshaft when the plurality of electrical coils are powered.

Abstract: A first coil including a first metal, and a second coil including a second metal having a lower electrical resistivity than the first metal are disposed in a slot of a stator core. The slot includes a slot opening, a curved slot bottom portion connecting to a yoke, and first and second side portions disposed between the slot opening and the slot bottom portion. A first straight line connects borders between the slot bottom portion and either of the side portions. A first region is surrounded by the first straight line and the slot bottom portion. A second region is located between the slot opening and the first straight line in the radial direction. Areas S1 and S2 of the first and second regions, and total cross-sectional areas A1 and A2 of the first coil in the first and second regions satisfy (A1/S1)>(A2/S2).

Abstract: An electrical machine comprising a rotor 20, a stator 30 and an air gap 40 arranged between the rotor 20 and the stator 30 is provided. The stator 30 or rotor 20 comprises a plurality of electrical coils 90, wherein one or more of the electrical coils 90 carry a heat sink, wherein the heat sink is attached to the electrical coil with a thermally conductive material. Methods for modifying a temperature distribution of a stator in an electrical machine are also provided.

Abstract: A lamination stack for use in a rotating electrical machine includes a plurality of sheets of ferritic material. Each of the sheets has first and second sides that include asperities, and the asperities have a height of about two microns and a width of about two microns. A layer of electrically insulating material is provided between adjacent pairs of the ferritic sheets in the stack, and the asperities extend into the electrically insulating material.

Abstract: A vibration-driven energy harvesting element includes: a pair of fixed electrode portions that have a plurality of fixed comb teeth and are arranged such that the plurality of fixed comb teeth face each other; and a movable electrode portion that is arranged between the pair of fixed electrode portions and has a pair of a plurality of movable comb teeth being inserted between the fixed comb teeth of the respective fixed electrode portions, wherein: the vibration-driven energy harvesting element has a three-terminal structure in which the fixed comb teeth and/or the movable comb teeth are electretized; a gap dimension of a clearance region between the fixed comb teeth and the movable comb teeth is smaller than 20 ?m; and an aspect ratio being a ratio of a dimension of the clearance region in a comb tooth height direction to the gap dimension of the clearance region, is 20 or more.

Abstract: An eddy current type resistance device comprising: a ring-shaped flywheel; a shaft center, the shaft center has an axial blind hole, the shaft center has a radial blind hole, the radial blind hole is connected to the axial blind hole; a positioning frame, connected to the shaft center inside the ring-shaped flywheel; multiple magnetic field generating components, evenly arranged on the positioning frame, and make the signal wires of the magnetic field generating components pass through the radial blind hole and the axial blind hole the outer end of the shaft center; and a side cover, connecting to the other side of the ring-shaped flywheel, and is connected to the shaft center by a bearing. Thereby having the effect of simplifying the type and process of the side cover.