Abstract: A carbon brush for transferring high currents having a connective piece for connecting an electric conductor and a consumable contact piece having a contact surface formed for abutting against a commutator element. The connective piece has a silver content of approximately 5% by weight to approximately 39% by weight and the contact piece has a silver content of approximately 40% by weight to 100% by weight.

Abstract: A rotary electric machine includes: a rotor; a shaft that penetrates the rotor along a rotation axis and is pivotally supported by a bearing; a stator accommodating the rotor inside; a rotor cover attached to an axial end surface of the rotor; and a casing having a flow passage for supplying oil to the bearing. The rotor cover has an oil receiving portion that forms a concentric clearance with respect to the shaft and receives the oil from the bearing in the clearance, and an oil distribution passage that communicates with the axial end surface of the rotor from the oil receiving portion. The rotary electric machine supplies the oil guided to the clearance to the oil distribution passage by centrifugal force to cool the rotor.

Abstract: An energy conversion assembly including an input shaft coupled to a first annular gear through a first direction limiting device configured to allow rotation of the first annular gear in a first direction and substantially inhibit rotation of the first annular gear in a second direction. The input shaft may be coupled to a second annular gear through a second direction limiting device configured to allow rotation of the second annular gear in the second direction and substantially inhibit rotation of the second annular gear in the first direction. The assembly may include a first transmitting gear engaged with the first annular gear, a second transmitting gear engaged with the second annular gear, a conversion gear operatively coupled to the second transmitting gear, and a transmitting shaft coupled to the first transmitting gear and the conversion gear.

Abstract: An outer rotor brushless motor includes: a shaft; a rotor; a stator; a tubular bushing at one side of the stator; an impregnated bearing at the other side of the bushing; and a washer rotatable integrally with the shaft. The bushing has: a fixed portion fixed to a core inner peripheral surface, the fixed portion having a first end surface facing a bearing end surface, and a first inner peripheral surface facing an outer peripheral surface with first clearance in between; and a housing having a second inner peripheral surface with a greater diameter than the first inner peripheral surface, on the one side of the fixed portion. An oil repellent finish is applied to a surface of the bushing. The washer is placed radially inward of the second inner peripheral surface. Second clearance greater than the first clearance is between the bearing end surface and the first end surface.

Abstract: An assembly comprising a rotational driving mechanism of a drive shaft, and an electromagnetic retarder capable of slowing down the rotation of the drive shaft. The driving mechanism has a housing and a drive shaft extending along an axial direction. The electromagnetic retarder has a stator support fixed to the housing that has at least one relief extending along the axial direction, and in that the housing comprises at least one complementary relief cooperating with at least part of the relief of the stator support to fix the position of the stator support in relation to the housing along at least one direction contained in a plane perpendicular to the axial direction.

Abstract: Various embodiments include systems and methods pertaining to a counter-rotating alternator arrangement that may be used to generate electrical energy. In various embodiments, the counter-rotating alternator arrangement may include a plurality of shafts, an alternator assembly, and a rotatable coupling arrangement. According to some embodiments, the rotatable coupling arrangement may include coupling components that are rotatably mated with one another such that a first shaft and a second shaft are aligned along an axis and extend in opposite directions from the rotatable coupling arrangement. The alternator assembly may include multiple rotors, and the counter-rotating alternator arrangement may be configured to rotate a first rotor and a second rotor in opposite rotational directions relative to one another, in accordance with various embodiments.

Abstract: A rotor for an electrical machine may include a rotor shaft, a hollow inner shaft, two end discs, and at least one outlet opening for discharging cooling medium. The rotor shaft may be configured as a hollow shaft having an inner lateral surface. The inner shaft may be arranged in the rotor shaft and may include at least one opening at least in one axial center for ejecting cooling medium onto the inner lateral surface of the rotor shaft to cool the inner lateral surface. The two end disks may delimit an interior of the rotor shaft in an axial direction. Each of the two end disks may include a central through opening through which the inner shaft is guided. The at least one outlet opening may be disposed in at least one of (i) each of the two end disks and (ii) a lateral surface of the rotor shaft.

Abstract: An electric motor comprises a stator presenting a first surface. A rotor is rotatable relative to the stator. The rotor presents a rotor raceway disposed in spaced relationship with the first surface of the stator. The first surface of the stator defines a plurality of slots in spaced relationship with one another to define a plurality of spaced teeth between the slots. At least one electrical conductor is disposed in each of the slots and configured to selectively create a moving magnetic field for acting upon the rotor for providing rotational movement of the rotor. A portion of the at least one electrical conductor extends substantially into radial alignment with, or past the first surface of the stator to at least partially define a stator raceway of the stator for engaging the rotor raceway of the rotor during relative radial movement between the rotor and the stator.

Abstract: An axial flux machine, in particular a single-sided axial flux motor, for an electrical machining device, includes a machine shaft, in particular a motor shaft, a disc-shaped stator, and a disc-shaped rotor which is arranged adjacent to the stator in the axial direction of the machine shaft. The stator is formed as a winding carrier for at least one stator winding and the rotor, which is connected to the machine shaft in a rotationally fixed manner, can rotationally moved relative to the stator. The axial flux machine further includes a housing for receiving the stator and the rotor. The housing is cylindrical, open on one side and formed with a substantially closed end face, and the housing fixes the stator in such a way that a defined air gap remains between the rotor and the stator. The axial flux machine can be arranged in an electrical processing device.

Abstract: A first shaft member of a shaft included in this rotor includes: a first large-diameter portion disposed radially inward of a rotor core; and a first small-diameter portion disposed on a first axial side relative to the rotor core. The first small-diameter portion is provided with a driving force transmitter to transmit a driving force, which is transmitted thereto from the rotor core, to a driving force transmission member. A portion of the first shaft member located on a second axial side is connected to a second shaft member of the shaft.

Abstract: There is provided a solution for electrical insulation for an output shaft, tool and/or accessory driven by an electric motor, and the presence of the electrical insulation is also easy to verify. A rotor shaft assembly for an electric motor includes at least one section that is configured to extend in an axial direction of the rotor shaft assembly outside of a stator assembly of the electric motor, when the rotor shaft assembly is rotatably mounted inside the stator assembly. An electrical insulator is connected to the at least one section and the electrical insulator is configured to connect to an output shaft for connecting with a tool and/or accessory, or configured to connect directly to a tool and/or accessory to be driven by the electric motor.

Abstract: This application describes a motor that includes a housing, an output shaft, a conductive bearing, and a conductive component. The output shaft is disposed in the housing. A positioning hole is disposed on an end face of a first end of the output shaft, and the positioning hole is disposed coaxially with the output shaft. The conductive bearing is disposed in the positioning hole, and includes an inner ring, and an outer ring that is fixedly connected to the output shaft. One end of the conductive component is fixedly connected to the inner ring of the conductive bearing, and the other end is connected to the housing. In this application, the motor can output, by using the conductive bearing and the conductive component, charges accumulated in the output shaft, to eliminate a generated common-mode voltage.

Abstract: A drive motor for a suction device (400) or a machine tool in the form of a handheld power tool (200, 300) or a semi-stationary machine tool, wherein the drive motor (20, 120) includes a stator (80) having an excitation coil assembly (86) and a rotor (40, 140) having a motor shaft (30, 130), which is rotatably mounted around a rotational axis (D) on the stator or with respect to the stator (80) by means of a bearing assembly (24A) and passes through a shaft through-opening (42, 142) of a laminated core (41, 141) which is held on the motor shaft (30, 130) and is electrically insulated from the motor shaft (30, 130). It is provided that an insulation sleeve (60) is arranged between the motor shaft (30, 130) and the laminated core (41, 141), which is inserted into the shaft through-opening (42, 142) and has a socket (64) with an insertion opening (64A) through which the motor shaft (30, 130) is plugged into the socket along an insertion axis (S).

Abstract: A brushless direct-current (BLDC) motor for a power tool includes a rotor assembly and a stator assembly including stator windings. A ratio of a motor size (Km) constant of the motor to an electrical envelope of the motor including electrical parts of the motor is greater than approximately 850 (N·m/?W)/m{circumflex over (?)}3. A ratio of a motor size (Km) constant of the motor to a magnetic envelope of the motor including stator core and windings is greater than approximately 980 (N·m/?W)/m{circumflex over (?)}3.

Abstract: A hub motor is disclosed, the hub motor is mounted on an axle assembly, the an axle assembly includes an axle rod and an axle sleeve, and an independent cassette flywheel is provided at one end of the axle sleeve where an end cover is located, a limiting sleeve is disposed outside of the cassette flywheel to prevent the cassette flywheel from detaching from the axle sleeve, and an anti-rotation piece for preventing rotation of the axle sleeve is provided at another end of the axle sleeve where a wheel hub is located.

Abstract: A partition wall of a drive device has a first partition wall and a second partition wall. The first partition wall extends in a direction intersecting with an axial direction and covers one end portion of a motor housing in the axial direction. The second partition wall extends in a direction intersecting with the axial direction and is disposed on one side in the first direction perpendicular to the axial direction with respect to the first partition wall, and covers the other end portion of the gear housing in the axial direction together with the first partition wall. The second partition wall is disposed on one side in the axial direction with respect to the first partition wall.

Abstract: Modified magnetic levitation system for flying vehicle Modified magnetic levitation system for flying vehicle includes a propeller system (11, 12, 13), an axial levitation system (101, 102), radial levitation system (part of 201), rotary propulsion system (part of 201) and passive magnetic bearing system (301). An axial levitation system includes plurality of halbach array pairs connected on rotor and special short circuited coil windings connected on stator. A propulsion mechanism (part of 201) is provided for rotating rotor along the centre axis. Radial levitation and propulsion system (201) includes halbach arrays (53) located at outer circumference of rotor and interweaved active and passive coil windings (43) located at inner circumference of stator. Passive magnetic bearing system (301) includes parts of rotor and stator around centre axis of the system. Passive magnetic bearing (PMB) is utilized to levitate rotor at rest, below lift-off speed, and start and end condition of rotations.

Abstract: The rotor includes a rotary shaft, a rotor core, and a plurality of permanent magnets. The stator includes a stator core and a plurality of coils. The stator core has a first contact surface. A normal vector to the first contact surface is aligned with a radially inward direction defined for the rotary shaft. A bearing holder (first bearing holder) has a second contact surface in contact with the first contact surface. A normal vector to the second contact surface is aligned with a radially outward direction defined for the rotary shaft. The bearing holder is positioned by bringing the first contact surface into contact with the second contact surface.

Abstract: A drive device comprises at least one tubular linear motor (M1; M1?; M2) which has a cylindrical armature (20; 120) and a tubular stator (10) with a cylindrical magnetic yoke (11) and a through-hole (13) coaxial with the magnetic yoke (11). Electric drive coils (12; 112) are arranged in the magnetic yoke (11). The armature (20; 120) has a non-magnetic armature tube (21) in which permanent magnets (23) are arranged. The armature (20; 120) extends coaxially through the through-hole (13) and is mounted so as to be movable in its longitudinal direction relative to the stator (10). The drive device comprises linear ball bearings (15; 115), and the armature (20; 120) of the tubular linear motor (M1; M1?; M2) is mounted in the linear ball bearings (15; 115).

Abstract: The invention relates to abasic body (1) for an electric motor (2), which comprises the following features: a substantially cylindrical outer wall (3), which forms a rotor space (4) for receiving a rotor (5) at least partially inside the outer wall (3) and on which a winding (6) can be mounted at least partially outside the latter; a laminated core (7) which is held by the outer wall (3); a receiving space (9) which serves to receive a printed circuit board (12) or another component of the electric motor (2) and which adjoins the rotor space (4); a partition wall (10) separating the receiving space (9) from the rotor space (4); at least one orienting device (13) for positionally orienting the printed circuit board (12) or the other component of the electric motor (2) inside the receiving space (9); a receptacle (17) for a cover (18) which closes the rotor space (4), said receptacle being situated on the outer wall (3) on the side of the rotor space (44) opposite to the partition wall (10); and an inner wall (