Abstract: A hole piercing a bracket and another hole piercing a circuit board are formed at places between adjacent two salient poles among a plurality of salient poles of a stator core and the places correspond to tips of the two salient poles. A relative position between a hall element mounted on the circuit board and the stator core can be adjusted with a jig through those holes.

Abstract: Outflow of heat generated by a linear motor to the outside is suppressed. A linear motor according to the present invention is a linear motor used in a vacuum atmosphere, including a stator, a movable element movable relative to the stator, and a metal film formed on the surface of at least one of the stator and the movable element. This decreases the emissivity and reduces the outflow of heat by radiation from the linear motor.

Abstract: When a yoke 11 is inserted into a bobbin hole 20 from the one end of a coil bobbin 13A, 13B until a positioning portion 17 of the first leg 11A, 11B of the yoke 11 is brought into contact with the one end of the coil bobbin 13A, 13B a engaging portion 18 of the first leg 11A, 11B is engaged with the projection 13e of the coil bobbin 13A, 13B within the bobbin hole 20 so that the longitudinal movement of the yoke 11 for the coil bobbin 13A, 13B is limited. Through this limitation, the yoke 11 can be attached to the coil bobbin 13A, 13B.

Abstract: A rotor disc assembly 10 for an AC machine includes a rotor disc 20, permanent magnets 30 and a spider 40. The rotor disc 10 has a circumferential lip 22 projecting from a surface thereof. The permanent magnets 30 are positioned in a circular array on the surface of the rotor disc 20, with constant angular pitch, and so as to lie against the lip 22. The spider includes an annular base portion 41, with a plurality of arms 42 projecting radially outwards therefrom. The spider 40 is fixed to the surface of the rotor disc 20 such that each arm 42 is between and abuts a respective juxtaposed pair of the permanent magnets 30. The arms 42 and the members 30 are each provided with cooperating wedge-shaped cross sections such that each arm 42 constrains the respective two permanent magnets 30 both axially and tangentially on the surface of the rotor disc 20.

Abstract: A brushless motor is capable of increasing output torque while suppressing an increase in iron loss. A plurality of magnets are magnetized in reverse radial orientation in such a manner that magnetic fields directed toward a stator converge toward the stator, and each of the magnets is provided at opposite ends of its outer peripheral surface with a pair of notched portions that are cut away to gradually approach in an axial direction as they proceed from an intermediate portion to the opposite ends.

Abstract: Provided is a motor, which can minimize friction caused during initial operation and smoothly discharge static electricity generated during operation by employing both an air dynamic bearing and a fluid dynamic bearing using oil of predetermined viscosity. Bearing means employed in the motor includes a fluid dynamic bearing generating a fluid dynamic pressure by forming an oil gap between a rotor and a stator such that oil is accommodated in the oil gap, and an air dynamic bearing generating an air dynamic pressure by forming an air gap between the rotor and the stator such that air is introduced into the air gap. Specifically, the fluid dynamic bearing generates a fluid dynamic pressure by forming an oil gap between an axial hole of a sleeve and a shaft such that oil is accommodated in the oil gap, and the air dynamic bearing generates an air dynamic pressure by forming an air gap between an inner circumferential surface of a hub and an outer circumferential surface of the sleeve.

Abstract: A power tool includes an electric motor (6) located in the tool housing (4) and capable of rotation in both clockwise and counterclockwise directions, a brush carrier (14) carrying at least two brushes (2) that electrically contacts the commutator (12) of the motor (6), an actuation member (26) accessible from outside of the housing (4) for rotating the brush carrier (14) relative to the housing (4) in a circumferential direction (U) of the commutator (12) between clockwise rotational position and counterclockwise rotational position, and a device for preloading the brush carrier (14) in both clockwise and counterclockwise rotational positions and having at least one spring member (32) for biasing the brush carrier (14) both in the circumferential direction (U) and the axial direction of the commutator (12).

Abstract: An axial gap rotating electrical machine is provided with permanent magnets and cores in a rotor. The permanent magnets are oriented such that magnetization surfaces face in the circumferential direction of the rotor. The cores are arranged alternately with the permanent magnets in the circumferential direction of the rotor. The amount of magnetic flux on the outside in the radial direction of the rotor is made greater than the amount of magnetic flux on the inside in the radial direction of the rotor. As a result, the magnetic flux density at the rotor cores can be made substantially constant in the radial direction of the rotor and torque output with respect to the size of the permanent magnets is improved by preventing magnetic saturation of the cores.

Abstract: A stator for use in internal combustion engine, the stator comprises a central core having a top surface, a bottom surface, and a plurality of openings extending therethrough. The central core includes a plurality of poles extending outwardly from the periphery of the core. The periphery of the core and the poles are electrically insulated from the central core by an insulating material. Wire is wound on the poles to produce wire coils around each of the poles. The wire coils are electrically connected to lead wires from ignition and/or charging system circuitry or components. Wires from the wire coils and the lead wires are inserted into at least one of the openings in the central core where they are terminated and secured with lead wires from ignition and/or charging system circuitry or components. The wires from the wire coils and the lead wires can also be connected prior to their insertion into the openings wherein the connected wires are secured.

Abstract: A support device of a motor shaft includes a shaft, a shaft seat and a bearing. The shaft is joined to a fan blade set at an end thereof and provides a circular shape at another end thereof. The shaft seat has a circular recess corresponding to the circular end so as to join with the shaft. The bearing fits with the shaft to support the shaft during the shaft rotating and the shaft seat further has a hollow space at the center thereof to receive the shaft. Due to being attached to the shaft seat and supported, the shaft is capable of rotating steadily to overcome deficiency of swinging residing in the prior art.

Abstract: The invention proposes a method of making a rotor (12) for a rotary electrical machine, the rotor including a core (14) on which there is formed at least one electrical winding (16) comprising at least one electrically conductive element (18) which is coated with an outer bonding layer (32), of the type in which the winding step is followed by a step of change of state which causes softening of the bonding material to take place and which then causes it to solidify once more, characterized in that the winding of the conductive element (18) is carried out on the convex outer cylindrical wall (40) of a tubular element (42) of the core, and in that, after the said step of change of state, the tubular element (42) is assembled on a core body (44) in such a way as to minimize the temperature gradient in the winding (16) during the step of change of state.

Abstract: The present invention relates to an electrical machine, comprising: a supporting structure; a stator cantilevered-out from the structure; and a rotor mounted to rotate on the structure about an axis of rotation in such a manner as to be capable of being driven by the stator, the supporting structure comprising a hollow central shaft substantially coaxial about the axis of rotation of the rotor, an electric cable for powering the stator traveling along the inside of the shaft, and the rotor having a drive surface for transmitting torque to at least one element that is to be driven, the drive surface being situated at least in part around the shaft.

Abstract: An electrical machine, in particular a direct current motor for vehicles, has a multi-pole stator which has an annular pole housing (1) and a plurality of magnets (2) that are located on the inside face of the pole housing (1). The electrical machine further includes a magnet splinter guard (3), which shields the magnets (2) inward in the radial direction toward the rotor, in which the magnet splinter guard (3) is formed from a rectangular blank, has an overlapping region (4), extending in the circumferential direction over the axial length of the magnet splinter guard (3). On each of the ends (6, 7) of the magnet splinter guard (3) located in the axial direction, a respective centering ring (8) is located, for centering the magnet splinter guard (3).

Abstract: An electromechanical converter, in particular an electric variable transmission, is provided with a primary shaft (5) having a rotor (8) mounted thereon, a secondary shaft (7) having an interrotor (15) mounted thereon, and a stator (10), fixedly mounted to the housing (3) of the electromechanical converter. Viewed from the primary shaft (5) in radial direction, the rotor (8), the interrotor (15) and the stator (10) are arranged concentrically relative to each other. The rotor (8) and the stator (10) are designed with one or more mono- or polyphase, electrically accessible windings. The interrotor (15) forms one whole both mechanically and electromagnetically, and is arranged as a conductor for the magnetic flux in an at least tangential direction.

Abstract: A line start reluctance synchronous motor includes: a single phase stator arranged at an inner circumferential surface of a motor body and on which a main coil and a sub coil are wound; a magnet unit free-rotatably arranged along an inner circumferential surface of the stator in order to maintain an air gap with the stator; and a cage rotor provided with a rotation shaft at a center portion thereof to be rotatable along an inner circumferential surface of the magnet unit.

Abstract: An electromagnetic actuator includes a fixed core supported by a bottom wall of a housing, a movable core arranged opposite to the fixed core via an air gap to drive the movable member, and coil assembly supported by the housing to surround both the cores, wherein the movable member and the movable core are connected by connecting means for adjusting the air gap between the fixed core and the movable core, and wherein an adjustment operating hole through which the connecting means is adjusted is provided on the fixed core so as to be opened outside the bottom wall of the housing. Thus, it is possible to freely adjust the air gap between the fixed core and the movable core without preparing several types of connecting members.

Abstract: Disclosed is a coin type vibrating motor including: a rotor provided with an upper base including at least one wound coil placed on the upper surface thereof; a stator including a pair of brushes placed on the upper surface of a lower base, on which a magnet is mounted corresponding to the wound coil; and a shafting unit including a bearing member formed integrally with the upper base to surround the wound coil and the weight, and a shaft, of which the bearing member is installed on the outer periphery, wherein an oil scattering-preventing portion, which exposes an assembling region, and has an inner surface extended downwardly to a designated length while being spaced from the inner surface of the shaft, is formed integrally with the lower surface of an insulator exposed to the outside through an opening of the upper base.

Abstract: A motor and a brush device are provided which allow an easy assembly of brush holders. The brush holders have fixing portions and brush accommodating portions integrally formed therewith. The fixing portions are secured to the gear case, and the brush accommodating portions slidably hold brushes. The motor has a gear case which is integrally formed with a reduction mechanism accommodating portion to accommodate a reduction mechanism and with a brush holder mounting portion in which the brush holders can be installed in a direction of an axis of the output shaft.

Abstract: A magnetic rotating motor generator of the present invention comprises a rotating portion which is made of a non-magnetic substance whose periphery is provided with a group of permanent magnets tilted at a predetermined angle in an embedded manner; a group of electromagnets that are disposed adjacently to the rotating portion so as to oppose the group of permanent magnets; a positional sensor for detecting positions of the group of permanent magnets; a controller for applying an electric current to the electromagnet on the basis of a detected signal from the positional sensor; and a power generating section for obtaining power from a coil of the electromagnet. A rotation mode and a power generation mode are repeated, so that power generation is performed while a function as a motor is exhibited.

Abstract: A low magnetic signature motor system (1) comprises a plurality of electric motors (2), a first shield (9) and a second shield (13). The electric motors are arranged with their associated magnetic moments (6, 7) forming a closed loop such that their net external magnetic field (5) is minimized The first shield comprises a material with a high electrical conductivity and substantially surrounds the electric motors such that the a.c. component of the magnetic field is reduced; and the second shield comprises a material with a high magnetic permeability and substantially surrounds the first shield such that the d.c. magnetic field is reduced.