Abstract: A direct current motor comprising a field magnet provided with 2 mn magnetic poles which are magnetized with the same angular intervals as those of the magnetic poles N and S, where m is an integer of 1 or more, and n is an integer of 3 or more; a magnetic member for closing the magnetic circuit of the magnetic poles of the field magnet; an armature in which m(2n.+-.1) armature coils are arranged with an equal pitch, the armature being directed towards the magnetic poles in the magnetic circuit; electric power supply control device capable of performing the switching of armature current 2 mn (2n.+-.1) times per revolution of the armature; and a rotating shaft for rotatably supporting the armature and one of the magnetic poles, the rotating shaft supported by a bearing disposed in an outer casing of the direct current motor.

Abstract: This invention provides a DC multi-pole electrodynamic device, specifically a cup type DC multi-pole coreless motor having fixed field magnets, a magnetic material for closing the magnetic circuits of the field magnets, an armature composed of armature coils constructed of a plurality of loops, each having successive active armature portions adjacent to successive ones of said fixed magnetic field poles, respectively, the armature coils being formed by winding a conductor in substantially the same circumferential direction a predetermined number of times, the armature coils being formed by winding said conductor periodically in opposite axial directions with respect to magnetic poles without forming adjacent physically closed coils, the armature having coil taps equal to half the number of magnetic pole pieces, a commutator having commutator segments electrically connected to said coils, and a set of two fixed brushes.

Abstract: A commutator assembly for a dynamoelectric machine with metallic brushes has a plurality of composite carbon commutator bars retained on a generally cylindrical molded core with radial extensions and retaining lips at each axial end. A hook member for each bar has a U-shaped portion clamping one end of the bar and trapped in the molded core for retention of the bar against migration due to tangential brush force and a hook portion projecting outward for armature wire connection.

Abstract: A direct current motor comprising a field magnet provided with 2n magnetic poles which are magnetized with the same angular intervals as those of the magnetic poles N and S, where n is an integer of 1 or more; a magnetic member for closing the magnetic circuit of the magnetic poles of the field magnet; a plurality of armature coils in such a manner that the angular intervals of the electrically conductive portions thereof, contributing to the generation of torque in the armature coils, are substantially equal to the magnetic pole width of the field magnet; electric power supply control device to which the terminals of the armature coils are connected; short-circuit members for short-circuiting the winding initiation terminals of predetermined armature coils and the winding end terminals of other predetermined armature coils through the electric power supply control device; an armature comprising armature coils in the first series and armature coils in the second series through which the short-circuit members

Abstract: A commutator including commutator segments each having a stepped portion formed at the bottom of a slot which is formed at one end of the commutator segment and into which portions of armature coils are inserted, to prevent axial escapement of the armature coils. A lower coil of the armature coils is plastically deformed to conform to the contour of the stepped portion and outer surface of an upper coil of the armature coils is plastic-deformed together with the commutator segments by pressing the edge of the opening of the slot to couple the armature coils to the commutator segments.

Abstract: A segment of a commutator made by(a) placing a first layer of copper powder and on top thereof a second layer of a mixture of carbon powder and a binder into a die with a cavity shaped like the segment,(b) densifying the powder layers to produce a blank having the form of the segment, and(c) sintering the blank at an elevated temperature to cause the powder particles to cohere and the layers to firmly join together.

Abstract: A commutator for electric machines is disclosed. The commutator comprises a cylindrical body of insulating material having a plurality of lamella segments affixed by means of projecting anchoring elements about the periphery thereof. Each lamella segment is provided at one end with a hook base and hook to the latter of which a coil wire is electrically and mechanically connected by welding. The insulating body has radially and axially projecting ribs which support the respective hook bases of the lamella segments. The width of each supporting rib and associated hook base gradually increases from a point adjacent the hook toward the transition from the hook base to the lamella segment to provide better support and heat conductivity during the process of welding the coil wire to the hook.

Abstract: A DC electric motor comprising a tubular support carrying spaced bearings, a shaft journalled in said bearings for coaxial rotation within said support and having a driven end portion extending from a first end length of said tubular support, a rotor comprising a hollow cylindrical rotor body carrying a rotor winding, said rotor body being secured at one end to said extending shaft portion so that the first end length of said tubular support is coaxially freely received within said hollow cylindrical rotor body, a stator surrounding said rotor, and a commutator mounted to said shaft end portion at the exterior side of said rotor body remote from said tubular support.

Abstract: A commutator apparatus for rotary electric machines comprises a plurality of commutator segments mounted side by side on a rotary shaft through an insulating ring along the periphery thereof, an armature winding wound on a rotor core and including a plurality of coil ends projected axially from the rotor core, and a plurality of risers made of a conductor, one end of each thereof being connected to one axial end of the corresponding commutator segments, the other end of the riser being securely connected to one end of the corresponding armature coil. Each pair of adjacent risers are bound by an insulating binder to reduce the space therebetween, thus forming a substantially delta-shaped space defined by the adjacent risers on each side of said binder. The vibrations of the risers are thus absorbed and the vibratory stress of the risers is reduced, thus improving the mechanical strength and reliability of the commutator apparatus.

Abstract: An electric motor having a hook-shaped commutator about which more than one coil wire per hook is wound with the coil wire making contact with the commutator segment has a hook formed at the winding end face of a commutator segment, the hook base extending below the outer surface of the face, the hook being bent in the direction of a depression which corresponds to the diameter of a first coil wire formed between the hook and the face of the segment and is located at the outer edge of the face so that when a second coil wire is inserted it will necessarily be located in direct contact with the hook and radially above the first wire which will lie, at least in part, below the outer surface of the face.

Abstract: In an induction and universal motor combined in a common lamination stack and supplied from a single phase line in line with a single armature winding system common to universal commutator motor as well as to induction motor operation, there are connected to the same segments of the commutator a crossed lap winding and an uncrossed lap winding, the coil span of which corresponds approximately to one pole pitch of the low pole and, in particular, two pole commutator stator winding and to an uneven integral multiple of the high pole induction motor stator winding, to provide a motor particularly suited for driving automatic washing machines.

Abstract: An armature commutator associated with a slotted core is constructed with a temporary tang structure which is employed during winding on a tang-type winding machine. After the core is wound and the commutator bars are connected, the temporary tang structure is removed resulting in a lead loop-type wound commutator.

Abstract: An improved method of manufacturing coreless armatures typically for coreless motors, according to which a coreless cylindrical coil and an insulative disk member carrying commutator segments and rotary shaft are mechanically strongly coupled together without any adhesive agent, is provided. A radially inward compressive force is applied to the outer periphery of the coil within which the disk member is inserted at position for the coupling until coil windings partly bulge inwardly to clamp the peripheral edge of the disk member whereas a substantial part of the windings is compressed dense and into a smooth cylindrical shape.

Abstract: This invention relates to an improved armature for a four pole wave wound direct current machine and also to a method for winding the armature for such a machine. A plural turn winding is free formed or wound in place to substantially a final shape with two ends spaced for connection to commutator segments spaced substantially 180.degree. apart on the armature and with at least four sides defining at least two open turns. The winding sides are spaced for engaging slots in the armature core which are spaced substantially 90.degree. apart. The winding is initially free formed and the turns are separated as necessary to insert the winding on the core and to position the winding sides in their assigned slots in the armature core.

Abstract: A direct current motor, having armature windings superposed on each other in double layers, is provided with a fixed field magnet having 2 mn poles (m being a positive integer of 1 or more, n a positive integer of 2 or more) magnetized alternately to N and S polarities in equal angular spaces, a magnetic material member for closing the magnetic path of the field magnet, rotating shaft supported by bearings provided in the housing of the motor, and an armature secured to the shaft for rotation in the magnetic path facing to the field magnet poles. A first series of m(2n-1) armature windings mounted on the armature are juxtaposed side by side at equal pitches, the angular spacing between the conductor portions of the windings, which contribute to generate torque, being equal to the angular width of the field magnet pole.

Abstract: A direct current electric machine with an ironless skew wound rotor coil rotating in the air gap of a stationary magnetic circuit is disclosed, wherein the rotor coil comprises a plurality of coil sections each connected by its ends to two corresponding collector segments and each section is constituted by at least two parts. The said parts are groups of adjacent wire turns which groups are placed side by side on the rotor cylinder and are connected in parallel to the collector segments corresponding to the coil section.

Abstract: A laminated electromagnetic core and a method of manufacturing incorporates a double layer winding with the core being formed from first and second sets of apertured laminations of which one set accommodates the conductors of one layer of the winding and the other set accommodates the conductors of the other layer of the winding the conductors being interconnected by end windings and adjacent laminations in each lamination set are displaced from mutual alignment to permit the conductor end windings to be of minimal length such that conductor ends which are to be interconnected adjoin one another, thereby facilitating the formation of end windings by in situ casting.

Abstract: Armature windings for commutator type dynamo-electric machines. The specification discloses a method, device and machine for enabling inter-coil lead wires to be reliably placed in and retained temporarily in a connection slot at the connection end of the relevant commutator bar by carrying a lead wire from one armature coil through that slot and along the commutator surface, looping the wire around the shaft at the end of the commutator, carrying the wire back along the commutator surface and through the slot, and leading it to the next armature core slot ready for the winding of the next coil.