Abstract: An electronically commutated dc motor having a dome-shaped external rotor and a stator having a double-T-shaped design with the stator consisting of one yoke stack disposed asymmetrically in relation to the longitudinal stator axis and of two pole stacks of which each is provided with an extension on the same side in the longitudinal direction. In the circumferential direction the extensions are provided with lugs.

Abstract: In a coreless-brushless motor in which a driving coil block is mounted on a stator yoke, a bearing is fixed to the stator yoke in alignment with the central portion of the driving coil block, a rotary shaft is rotatably supported by the bearing, a rotor yoke is affixed to the rotary shaft and a rotor magnet is mounted on the rotor yoke in adjacent and opposing relation to the driving coil block, a magnetoelectric transducer pellet is housed in a recess made in the stator yoke on the side of the driving coil block, for detecting magnetic fluxes emanating from the rotor magnet. The magnetoelectric transducer pellet is connected to wires of a flexible printed circuit sheet, which is disposed between the stator yoke and the driving coil block.

Abstract: An induction motor with an improved torque/slip characteristic has a solid rotor having longitudinal grooves running parallel to the axis of rotation which connect with circumferential grooves at each end of the rotor. The rotor is plated with copper so that the grooves are filled with copper. The rotor is then machined over the cylindrical outer surface to produce a solid, non-laminated rotor having high-conductivity paths in the longitudinal grooves connected by high-conductivity short-circuiting rings in the circumferential grooves.In a modification the longitudinal grooves may be skewed. Other high conductivity material may replace copper, for example aluminium.

Abstract: An electronically commutated d.c. motor having a dome-shaped external rotor and a stator of a double-T-shaped configuration. Stator includes one yoke stack disposed asymmetrically in relation to the longitudinal stator axis. In addition, the stator includes two pole stacks each of which is provided on the same side with an extension in the circumferential direction. A printed circuit board is secured to a mounting flange of the d.c. motor.

Abstract: A flat type rotary electric machine has a flat stator armature coil and two rotors having magnets disposed in opposite relationship to the coil. The flat coil is formed by an annular carrier member of an insulating material and windings carried thereby. The windings are formed by a plurality of layers of annular rows of generally radially extending and axially thin conductor segments each having radially inner and outer end sections and an intermediate effective section axially aligned with magnets on an associated rotor during rotation thereof. The axial thickness of the effective section of each of the conductor segments of the outermost layers is smaller than the axial thickness of the effective section of each of the conductor segments of inner layers.

Abstract: A wire having conductor core, insulating film formed on the conductor core and adhesive film formed on the insulating film is closely and fixedly wound by a predetermined number of turns. Thus, a coil for an electric motor is obtained. A pair of electrodes are formed by stripping portions of the insulating film and portions of the adhesive film formed on the insulating film.

Abstract: A fast rotating ferrite ring engine that is started by an external starting motor generates a medium mechanical power continuously. The rotating ferrite ring engine body is composed of thin circular ferrite rings affixed to a nonmagnetic plate connected to external devices necessary for the inventive operations, a heat portion, a magnetic field generator both of which are located in the same place where the rings are passing through, and a cooling portion through which the ferrite rings also are passing and restoring cyclically the heated portion of the rings to the cool state that is magnetizable.After starting by an external starter motor, the ferrite ring engine is controlled at a constant peripheral velocity V.sub.O by the countertorque of an externally connected electric power generator.In this state, the magnetic energy which enters into the heat portion is made to V.sub.O .multidot.HB.sub.S .multidot.S.multidot.(1/8.pi.).multidot.10.sup.

Abstract: A stator yoke for a DC brushless motor is comprised of a layer of insulating material of a predetermined thickness and a layer of magnetically permeable material which are bonded to each other by adhesive or the like. The magnetically permeable layer can be composed of several steel plates, preferably of silicon steel, bonded to each other. The insulating layer in one embodiment is composed of a cloth-like material, for example, of glass fibers, and a cured adhesive filling the interstices of the cloth-like material and bonding the insulating layer to the magnetically permeable layer.

Abstract: A brush board for a dynamoelectric machine is formed with resilient arms which are an integral part of the board and have commutator engageable brushes affixed at the free ends thereof. The board carries printed circuitry which extends to the free end of the arms and connects with the brushes.

Abstract: An armature disc for an axial air-gap, direct current electric motor in which the armature consists of two half turn metal discs laminated to the opposite surfaces of an expoxy resin impregnated laminate disc with the half turn of the one disc joined to the mating half turn of the other disc at the mating surface at the disc I.D. and O.D. The resin disc extends from the I.D. of the half turn discs across the commutator area of the armature at the armature disc I.D. and terminates at or adjacent to the O.D. of such commutator area. The half turns outward of said O.D. may be air spaced or laminated to the opposite surfaces of an epoxy resin impregnated spacer disc.

Abstract: An electric motor construction and method particularly adapted for integration in rotating final drive members. The motor includes a hollow armature assembly rotatably supported about a permanent magnet stator. The armature assembly includes a winding preferably fabricated by printed circuit techniques in the form of flat conductors clad on a flexible dielectric sheet rolled into a tube and a soft magnetic tube circumferentially surrounding the winding to provide a structural support and a heat sink for the winding and a flux return path for the poles of the permanent magnet stator. In the preferred embodiment, the motor is integrated in the cleaning brush of a vacuum sweeper unit.

Abstract: A motor stator having a salient pole magnetic core on which are wound coils of conductive wire incorporating an annular printed circuit board having a plurality of terminals formed around the outer periphery of the board. The terminals are formed by radially extending conductive regions, each region having a V-shaped notch extending in from the periphery of the printed circuit board. The printed circuit board is secured directly to the projecting ends of the coils at one end of the core and the two wire ends of each coil are secured in adjacent notches.

Abstract: A method for fabricating an electric machine stator core and winding assembly characterized by insulated sectionalized coils suitable for automatic fabrication and assembly. Bundles of straight coil side wires are externally insulated and inserted longitudinally into the stator slots, and the coil end turns are manufactured separately as planar arrays of printed circuit conductors or discrete wires adhered to end cap insulating boards. Upon stacking the boards against each stator core end face, the aligned coil end turns and sides are selectively joined to form a continuous winding. The objective is lower cost wound stators for small and medium ac and dc motors.

Abstract: A motor stator having a salient pole magnetic core on which are wound coils of conductive wire incorporating an annular printed circuit board having a plurality of radially projecting terminals. The printed circuit board is secured directly to the projecting ends of the coils at one end of the core and the two wire ends of each coil are secured to pairs of adjacent terminals on the board. External electrical leads are then threaded through the core between the coils with one end of the respective leads electrically joined to terminals on the board.

Abstract: A motor stator having a salient pole magnetic core on which are wound coils of conductive wire incorporating an annular printed circuit board having a plurality of radially projecting terminals. The printed circuit board is secured directly to the projecting ends of the coils at one end of the core and the two wire ends of each coil are secured to pairs of adjacent terminals on the board. External electrical leads are then threaded through the core between the coils with one end of the respective leads electrically joined to terminals on the board.