Abstract: A molded product in which a parting line can be disposed at an inconspicuous position on the appearance of the product. The molded product includes a main body having a cylindrical shape and a hole penetrating through the main body in a radial direction, or a protrusion protruding in the radial direction from the main body, and in the molded product, a parting line corresponding to a matching surface of molds is formed in the molded product, and the parting line has a first line extending from the hole or the protrusion to one side in a circumferential direction of the main body, and a second line extending from an end point on the one direction of the circumferential direction of the first line to an end portion in an axial direction of the main body.

Abstract: A number of illustrative variations may include a rotor core for an electric motor comprising permanent magnets wherein the rotor core comprises lobes of the core material that magnets may be attached to.

Abstract: A linear motor system comprises a plurality of stator elements that have one or more magnetic coils for generating a magnetic flux in the respective stator element and at least one mover that has at least one magnetic element that interacts with the magnetic coils of the stator elements. The mover is moved by means of activation of at least one stator element in a direction of movement relative to the stator elements. At least one selected stator element is configured to change with respect to the magnetic flux from a first state into a second state or to have the second state permanently while at least some of the other stator elements remain in the first state so that the selected stator element exerts a braking and/or holding force on the mover in the second state.

Abstract: A twin radial air gap permanent-magnet-on-rotor brushless motor with a rotor comprising two magnet rings and a stator comprising individual iron-core-based stator pole modules containing a wound stator pole element with outward facing and inward facing radial pole surfaces, co-planar with the two magnet rings across the twin radial motor operating air gaps. Pole modules are mounted in a circular array upon an insulating surface or printed circuit board in automatic assembly operations interconnecting field coil windings in the desired pattern and including other electrical control components, with pole modules centered on the motor rotation axis and predominantly enclosed by the rotor. Field coil windings are supported by insulating bobbins located around the radial extent of the stator pole elements between the outer and inner facing radial pole surfaces with electrical means for connection to the electrical interconnection function supplied with the insulating surface or circuit board.

Abstract: A voice coil motor driving device and a method for providing control signals of the same are provided. The voice coil motor driving device includes a control module, a current driving module, and an input module. The current driving module outputs a plurality of digital current signals according to a driving signal, each of the plurality of digital current signals includes a plurality of current unit signals, and each of the plurality of digital current signals is arranged in a first time period, each of the plurality of digital current signals includes a plurality of reverse current unit signals, and the plurality of reverse current unit signals are arranged in a second time period, which is at a beginning of the first time period, or arranged in a third time period, which is at the end of the first time period.

Abstract: A power tool device comprises a housing, a transmission mechanism installed in the housing, and an adapting mechanism deployed with a tool head, a switch member adopted for manipulating the attachment and detachment between the transmission mechanism and the adapting mechanism in a steady and safety manner. Therefore, that the operator only needs to carry a variety of tool heads and a power tool device is ample enough to deal with most of the situations which makes it much easier for the operators to work in a high flexibility and efficiency fashion.

Abstract: A brushless direct-current (BLDC) motor is provided with a stator assembly including a stator core and stator windings wound around stator teeth, a rotor shaft extending along a longitudinal axis, and a rotor including a rotor core mounted on the rotor shaft supporting at least one permanent magnet. A circuit board is provided including a main body and at least one leg radially projecting from the main body to support at least one magnetic sensor near the permanent magnet. The leg of the circuit board oriented along a radial plane that intersects the stator windings.

Abstract: The disclosed assembly comprises a housing and a stator inserted inside a cylindrical cavity in said housing. Said assembly comprises a means for point-to-point attachment of the stator to the housing.

Abstract: A motor assembly for powering a fluid blower includes a stator, a rotor rotatable relative to the stator about an axis of rotation, and an inner shell. The inner shell includes axially opposite first and second shell ends and encloses, at least in part, the stator and the rotor. An outer housing at least partly surrounds the inner shell such that an axially extending fluid channel is defined between the inner shell and the outer housing. A motor controller is positioned within the outer housing and is configured to control at least one operational parameter of the motor assembly. Furthermore, the motor assembly includes a flow-directing endshield located within the outer housing and adjacent the first shell end. The rotor is supported, at least in part, by the flow-directing endshield. The flow-directing endshield is fluidly interposed between the fluid channel and motor controller and is configured to direct a fluid flow between the fluid channel and the motor controller.

Abstract: A power tool including a housing, a controller within the housing, and a brushless motor within the housing and controlled by the controller. The brushless motor including a stator assembly including a stator core having stator laminations with an annular portion and inwardly extending stator teeth. The stator assembly defines a stator envelope in an axial direction extending between axial ends of stator end caps of the stator assembly. The brushless motor further includes a rotor assembly including a rotor core having rotor laminations and defining a central aperture that extends in the axial direction and that receives a shaft, and a position sensor board assembly including position sensors and configured to provide position information of the rotor core to the controller. The rotor assembly and the position sensor board assembly are provided at least partially within the stator envelope.

Abstract: A sensor device for an electric machine includes a rotor shaft mounted rotatably in a housing, with a signal generator that is or can be joined non-rotatably to the rotor shaft and is or can be arranged axially on the end face of the rotor shaft. A signal sensor is fixed to the housing opposite on the end face of the signal generator and at a distance from the signal generator. The signal sensor acquires an axial distance from the signal generator.

Abstract: A stator is formed by laminating electrical steel sheets punched into a predetermined shape. The stator includes split cores that are punched out from the electrical steel sheets to have an annular shape. A first group of the split cores adjacent to each other in the circumferential direction have the same rolling direction, and a second group of the split cores adjacent to each other in the circumferential direction have different rolling directions.

Abstract: A shaft (12) for cooling an electric machine (10) includes: an outer sub-shaft (32), which is designed for being rotationally fixed to a rotor (14) of the electric machine; an inner sub-shaft (30), which is rotationally fixed to the outer sub-shaft and is designed as an output shaft of the electric machine; an inflow (36) arranged in the radial direction between the outer sub-shaft and the inner sub-shaft, in order to supply cooling fluid (28) to the shaft; and an outflow (42) arranged in the radial direction between the outer sub-shaft and the inner sub-shaft, in order to discharge cooling fluid supplied to the shaft. The outer sub-shaft encloses a fluid chamber (40), which is arranged in the axial direction between the inflow and the outflow. A direction of flow of cooling fluid in the fluid chamber is established by a delivery direction of a fluid pump (24).

Abstract: An electric machine may include a substantially annular stator stack having a plurality of laminations which include mounting ears. A fraction of the laminations may be oriented such that the mounting ears are angularly offset from the others. The stator may be secured to a housing at both mounting ear locations thus improving structural rigidity and enhancing performance.

Abstract: An electric work machine with a product structure that effectively reduces noise caused by a brushless motor without changing the motor specifications. A hammer drill includes a brushless motor including a stator including an insulator, a cylindrical stator core, and a coil wound around the stator core via the insulator, and a rotor rotatable relative to the stator, a cylindrical member fixed along an entire outer circumference of the stator core and made of material with a Young's modulus higher than a Young's modulus of the insulator, and a housing accommodating the brushless motor and the cylindrical member.

Abstract: A multipart rotor shaft for an electric machine comprises a first shaft journal with a first end flange and a first axial passage bore, a second shaft journal with a second end flange. The rotor shaft also includes a hollow carrier for a laminated rotor core, a line element for conducting a cooling medium, and a separating element which divides a cavity between the carrier and the line element into a first partial cavity and a second partial cavity.

Abstract: An electric rotating machine according to an embodiment includes a stator, and a rotor that is rotatable about a rotational center. The stator includes a winding having an annular shape with the rotational center, a first core, and a second core. The first core surrounds a part of the winding, and has a pole face to which a magnetic flux is input in a first direction, and a pole face from which the magnetic flux is output in the first direction. The second core surrounds a part of the winding, and has a pole face to which a magnetic flux is input in a second direction, and a pole face from which the magnetic flux is output in the second direction. The rotor is positioned spaced from the first core and the second core, and is rotatable about the rotational center, relatively with respect to the stator.

Abstract: An electric motor includes a cylindrical rotor with a plurality of wires parallel to the cylindrical axis nested between two cylinders of magnets in a stator. The cylinders of magnets may be a solid magnet, a plurality of bar magnets, a plurality of coils generating magnetic fields or other magnets or generated magnetic fields. A nested electric motor includes a first electric motor additionally including a first shaft, which first electric motor nests within the hollow center of a second larger electric motor additionally including a second shaft. The first shaft is coaxial with the second shaft.

Abstract: An electric machine includes a plurality of conductive tracks defining an electric power circuit, to provide current for electronic power components, a printed circuit board which mounts the conductive tracks, an enclosure which defines a housing for the printed circuit board and has a dissipative wall, a heat-conductive filler interposed between the printed circuit board and the enclosure, an elastic device acting on the printed circuit board to press it against the dissipative wall, a conductive element held in position by at least one heat-sensitive joint and disposed to connect a first track and a second track to close the electric power circuit. The elastic device includes an elastic element pressed against the conductive element to apply a force on the heat-sensitive joint and the heat-sensitive joint is configured to break if subjected to a temperature higher than a predetermined threshold temperature to open the electric power circuit.

Abstract: An electric machine includes a stator and a rotor positioned in operational engagement with one another and defining a radial gap extending circumferentially between the stator and the rotor, the rotor including a plurality of rotor segments defining a plurality of segment gaps between adjacent pairs of the plurality of rotor segments, the rotor segments radially moveable relative to the stator, wherein movement of the plurality of rotor segments radially outward increases the radial gap between the stator and the rotor and the segment gaps between adjacent pairs of the plurality of rotor segments.