Abstract: A laminated coil which may be used as a winding in electrical machinery is formed by multiple layers of thin electrically conductive material, each having an insulating layer on one side and being shaped in a specialized pattern. The patterns each form a winding and are shaped such that current flow therethrough generates a magnetic pole at only three of four cross-sectional sides. The laminated coil is formed of layers of these patterns arranged to provide a magnetic pole at all four sides.

Abstract: A lightweight low reluctance rotor for a motor comprises a conductive pattern of a plurality of side-by-side coils formed on a flexible printed circuit board. The flexible board is rolled into a plural layer cylindrical drum and means are provided to interconnect non-adjacent coils to form a desired winding pattern.

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 is provided with a field magnet having 4 mn alternating N and S poles (m being a positive integer of one or more and n being a positive integer of two or more) that are magnetized within segments of equi-angular width about the field magnet, a magnetic-material member for closing the magnetic path of the field magnet, and a rotatably mounted armature having m(2n+1) armature windings equally distributed thereabout in a non-superposed manner with respect to each other and in a face-to-face relationship with respect to the field magnet poles, each winding having an angular spacing between those conductor portions thereof that contribute to the generation of the torque that is equal to the angular width of the field magnet poles.

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: An electric rotary stepping motor intended for use in watch movements comprises a stator including a coil support coaxial with the rotor, two compact coils having flat turns, and a field-closing yoke capable of magnetically blocking the rotor in a position enabling it to start up in the desired direction. The motor is made more compact, and its manufacture and assembly are simplified, by designing the coil support with two diametrically opposed arms and the coils as self-supporting elements in which the turns of the windings are joined to one another.

Abstract: Three-phase, alternating current, pole-amplitude modulation (P.A.M.) pole-changing electric motors or generators having series/parallel connection of phase winding parts for the alternate pole-members. To obtain approximately equal air-gap flux-density for both pole-numbers, selected coils are provided in branch connection with the main phase winding parts and switched in circuit for one pole-number only. Such selection, to be consistent with normal coil-reversal requirements of pole-changing by P.A.M., is shown to necessitate branch coils represented by similarly angularly positioned vectors in each phase-winding and of equal number in the reversed and non-reversed phase-winding parts.

Abstract: A plurality of conductors forming the armature windings are arranged in a superimposed stack, with their end faces aligned and located over the respective commutator strip or lamella. An electrode presses the stack against the lamella, another electrode, preferably liquid cooled, is applied to the lamella and solder, for example in form of a ribbon, placed against the end faces of the conductors forming the stack. Upon application of current, the solder will melt and flow between the commutator lamella and the conductor strips forming the armature winding to simultaneously, in one step, secure together the conductors and the commutator lamella. The method is particularly applicable to forming the armature windings in d-c motors for example in electric-car driving motors.