Abstract: A position sensor includes a plurality of E-shaped ferromagnetic cores arranged to define a circular opening therethrough to receive a shaft. Each E-shaped ferromagnetic core has a plurality of teeth, wherein adjacent E-shaped ferromagnetic cores of the arranged plurality of E-shaped ferromagnetic cores have an overlapping tooth. The position sensor further includes a frame surrounding the arranged plurality of E-shaped ferromagnetic cores, with the E-shaped ferromagnetic cores coupled to the frame.

Abstract: A field winding type synchronous machine has a stator having a stator core to which a stator coil is wound, and a rotor that rotates while facing a peripheral surface of the stator with an electromagnetic gap therebetween. The rotor includes a rotor core having a plurality of main pole portions and interpole portions, main pole windings wound around the main pole portions, interpole windings wound around the interpole portions, and a full-wave rectifier circuit for energizing the field current to the main pole windings. The interpole windings produce the induced current by a magnetic flux generated by a time harmonic current superimposed on a fundamental wave of the stator coil. The electromagnetic gaps between the interpole portions and a circumferential surface of the stator are configured larger than electromagnetic between the main pole portions and the circumferential surface of the stator.

Abstract: A stator segment unit adapted to build a ring-shaped stator when assembled is provided. The stator segment unit includes a stator yoke with at least one stator tooth protruding from the yoke, at least one stator winding having a first winding section fixed close to the tooth, and a second winding section extending freely from the stator segment unit.

Abstract: An electromagnetically excitable coil having a wire, the wire being wound around a wire holder in one winding direction, the wire having a winding start, which generally is disposed at a first end of the coil, and a winding end, which generally is disposed at the same end of the coil, using an uneven number of winding layers, the coil having an elongated cross-section and the cross-section having a longer side and a shorter side, the wire being routed from the second end of the coil to the first end of the coil while forming at least one wire crossing at the shorter side of the cross-section.

Abstract: A stator has four or more magnetic poles. A commutator has a plurality of segments arranged in the circumferential direction and a short-circuit conductor for short-circuiting predetermined segments from among these segments. Each segment has an angular width WS, and there is a gap of an angular width WU between the segments. A substantial angular width WB of each of an anode brush and a cathode brush satisfies (n?1)(WS+WU)+WU<WB<n(WS+WU)+WU, where n is an integer no less than two. A plurality of coils are each connected to the corresponding one of the segments in order to form n closed loops. The closed loops each pass through the corresponding segments and are electrically independent of each other.

Abstract: A fuel pump includes a pump portion for pumping fuel. The fuel pump further includes a magnet having magnetic poles circumferentially alternate with each other. The fuel pump further includes an armature on a radially inside of the magnet. The armature includes a rotor core provided with a coil formed of a wire. The armature is rotatable for driving the pump portion. A commutator, which is in a substantially disc shape, is provided to an axial end of the armature for rectifying electricity supplying to the coil. The rotor core has an axial end having an outer circumferential periphery defining a commutator-side collar portion extending toward the commutator. The coil is formed by winding the wire between an outer circumferential periphery of the commutator and the commutator-side collar portion.

Abstract: An armature where at least one of a first winding wire and a second winding wire is wound around slots that are opposed to all magnetic poles serving as a same magnetic pole in a predetermined winding direction so as to correspond to a predetermined winding number as a total winding number between respective slots, so that the plurality of coils are formed, and a slot from which the first winding wire is led out and a slot into which the second winding wire is led are located circumferentially at both sides of commutator segments with which the first winding wire and the second winding wire are conductive.

Abstract: The invention relates to a process for producing a rotating electric DC machine, where the main pole of the machine and the slots formed in it for the compensating winding are formed or placed in such a way that the slots are moved radially outward from the center of the stator to provide for an optimal increase in rotor diameter. In accordance with the invention, space is provided for the compensating winding to leave the slots in the main pole by making coil ends (4A) on the main coil (4) of the respective main pole tapered in the radially outward direction. In another alternative or complementary embodiment of the invention, additional space is created for the compensating winding where it leaves the slots by angling the coil ends (4A′) of the main coil radially outward.

Abstract: In a ripple voltage detection system of a rectified waveform, a motor rotation detection structure is provided to increase ripple voltage by modifying number of windings, to bring cogging torque and number of parts to be equivalent, and to achieve automatic operation function. In the motor rotation detection structure used for automatic operation function of switching device such as vehicle power windows or the like, rotor of this motor includes an armature core with a plurality of slots arranged between teeth, a plurality of coils wound around each of the slots, a commutator with a plurality of segments connected to each of the coils and the like. Winding number of each of the coils is modified per each of the slots, and potential difference between the segments adjoining to each other and having different winding number is increased. So, the ripple voltage generated at a rotation of the armature core is increased in comparison with the segments having the same winding number.

Abstract: A commutator motor has at least two supply terminals; a metallic pole tube, and an interference suppressing device, the pole tube being formed as a part of the interference suppressing device.

Abstract: A commutator is disclosed which is adapted to be mounted on a rotor shaft of an electric motor for cooperation with electrical contacts of the motor, the commutator being capable of accommodating two speeds of the motor. The commutator includes a support member formed of electrically insulating material and having a central opening for receiving the rotor shaft, the support member having a surface portion for attachment of commutator segments. A first plurality of circumferentially spaced, electrically conductive commutator segments are attached to the surface portion of the support member and are arranged in a generally circular array and wired to the armature to accommodate at least a first speed of the motor. A second plurality of circumferentially spaced, electrically conductive commutator segments are attached to the surface portion of the support member and are positioned radially outward of the first plurality of spaced commutator segments.

Abstract: A DC dynamoelectric machine with interpoles between field poles operable in sparkles even under heavy operating conditions comprising a solid soft iron magnetic flux bypassing members, each disposed between respective field poles and interpoles at their ends near its armature with an air gap between the field pole for controlling interpole magnetic flux, the solid soft iron magnetic flux bypassing member suppresses sudden change of magnetic flux flowing therethough by permitting flow of eddy current therethrough and maintains the interpole magnetic flux at a desired amount even during a sudden change of load current.

Abstract: An interpole for a direct current dynamoelectric machine is provided at the tip thereof with a flux shift winding, or windings, to effect a shifted magnetic flux strength to counteract induced voltages of the commutated armature coils moving through the commutating zone.

Abstract: A direct current motor having E-shaped interpoles, each of the E-shaped interpoles comprising interconnecting members which are made of a non-magnetic material having rigidity and which are tightly and irremovably inserted in gaps between a center pole and side poles of the E-shaped interpole. In the direct current motor according to the present invention, the side poles are mechanically interconnected to the center pole, so that noises generated by the vibration of the side poles are greatly reduced.

Abstract: A direct current motor used, for example, in a machine tool, comprising an armature, a plurality of main magnetic poles disposed around the armature having field windings wound thereon, and a plurality of E-shaped interpoles disposed at the intermediate position along the outer circumference of said armature between the adjacent main magnetic poles, each of the E-shaped interpoles consisting of a center pole to which an interpole winding is wound and two side poles, and the width of the gap between the outer circumference of the armature and the end surface of each of the side poles increases from the portion of the gap which is remote from the center pole to the portion of the gap which is adjacent to the center pole.In the DC motor according to the present invention, the linearity of the magnetic flux used for commutation is ensured in a wide range of the armature current, and, therefore, commutating characteristics of the E-shaped interpoles is improved.

Abstract: A brushless D.C. motor has electrical power switched between the phase windings by means of a circuit which includes a plurality of hall effect switches. The hall effect switches are operated by a plurality of arcuate commutating magnets which are radially polarized and are disposed axially adjacent to field magnets which are also radially polarized. Ordinarily, the direction of radial polarization of the commutating magnets and the field magnets will be opposite.

Abstract: A dynamoelectric machine, of the direct current type, with a circumferentially segmented stationary magnetic field structure providing magnetic poles including diametrically opposed pairs of north and south poles, with intervening poles of alternating polarity; rotor conductors extending longitudinally and selectively interconnected in sets providing a plurality of series current paths each traversing a plurality of stator active pole regions; and a pair of brushes for current collection at one or both machine ends.

Abstract: A direct current motor used, for example, in a machine tool, comprising an armature, n main magnetic poles disposed around the armature, each of the main magnetic poles consisting of a pole core on which a field winding is provided and a pole piece extending along the outer circumference of the armature, and n/2 E-shaped interpoles disposed at the intermediate position along the outer circumference of the armature between the adjacent main magnetic poles, and at the central axis of the armature, the angle spanning from the direct axis, which is electrically perpendicular to the interpole axis, to an end portion of a pole piece of a main magnetic pole is unequal to that from the direct axis to the other end portion of the pole piece of the main magnetic pole.Since the number of the E-shaped interpoles is decreased by half, the direct current motor according to the present invention has simple structure and high torque, and the heat generated by the interpoles is relatively decreased.

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 interpoles mounted therein. The motor comprises a circular-shaped yoke, two main magnetic poles equidistantly disposed inside of the yoke and with their polarities different from each other, an armature, having armature windings wound thereon, which is actuated by an electromotive force caused by the main magnetic poles and which is rotated in the magnetic field generated by the main magnetic poles, and interpoles which are disposed at positions located between the two main magnetic poles so as to face the armature windings. Each of the interpoles comprises three small poles which are disposed inside of the yoke and are magnetically insulated from the yoke. As a result of this construction magnetic circuits are formed between the adjacent two small poles of each interpole and the armature.

Abstract: To improve commutation and, particularly, to suppress commutator sparking and arc-over or flash-over, an auxiliary yoke is placed between the main poles and the auxiliary or commutating poles of a salient pole machine, the auxiliary yoke being formed of stacked lamellae, preferably with an adjustable air gap. Adjustability can be obtained by forming the auxiliary yoke with two interengaging sections, one of which is movable with respect to the other, so that commutation at the specific poles can be adjusted by adjusting the air gap of the auxiliary yoke.

Abstract: A permanent magnet-excited d-c machine including a stator, a plurality of flux-conducting pieces disposed in the stator, and a plurality of tangentially magnetized permanent magnets disposed in the stator between each of the flux-conducting pieces. Compensation slots are provided in the flux-conducting pieces on both sides of each of the permanent magnets and form a compensation tooth on the flux-conducting pieces between each of the slots and the permanent magnets in the stator. A winding is disposed in the slots adjacent each magnet and is looped around each magnet and each compensation tooth disposed between the compensation slots.