Abstract: An annular core used in a so-called air axial gap motor includes a magnetic and structural gap along the axial direction. By using a compressed molded body of a mixture of a magnetic metal powder and an electrically insulating resin as major constituents, an annular molded body and a molded plate are prepared. The annular molded body has slots and teeth alternately formed along the circumferential direction. The molded plate closes the upper portions of the slots to constitute a fully closed slot structure.

Abstract: An electromagnetic vibratory exciter having a non-linear elastomeric compression spring mounted in four quadrants around an electromagnet. The spring having curved armature contact surfaces of different heights on laterally opposite adjacent quadrants for providing selectable non-linear stiffening and deflection rates.

Abstract: A conveying apparatus of the type including a plurality of driving means disposed in the spaced relation along a track so as to allow a carriage to move on the track under the influence of inertia with the aid of propulsive force or reverse propulsive force which is generated by the plural driving means. The track has at least a curve and another driving means is disposed at the position upstream of the curve as seen in the direction of transportation of the carriage. To assure that the carriage moves along the curve at a proper moving speed a desired speed is so determined that centrifugal force exerted on the carriage is maintained at a level equal to or lower than a predetermined value. Speed controlling is effected in such a manner that the carriage is decelerated or accelerated from the moving speed detected at the time before it enters the curve to the desired speed by means of the last-mentioned driving means.

Abstract: To eliminate armature or rotor reaction or leakage flux (leakage reactance) in an electric rotating machine, a short-circuit coil winding is wound on and through the rotor or an armature core of the machine. The short-circuit coil winding is wound at a right angle to the main coil to exclude any intervention. Due to placement of a non-magnetic material in the armature core, the leakage flux which flows in the non-magnetic material is reduced and the flux of the stator and the rotor flows separately along both sides to the inner part of the armature or rotor ring core. Due to the non-magnetic material, the flux which occurs due to the current of the transformer m.m.f. of this short-circuit ring coil extends substantially into the airgap, therefore to abate the effect of armature reaction flux in the airgap.

Abstract: This disclosure relates to the art of magnetohydrodynamic (MHD) energy generation and is particularly directed to improvements in energy generating apparatus useful in that art providing a generating channel presenting in at least a portion of its confining surface a movable wall resistant to erosion and other deterioration under the action of high temperature gaseous fluids and solid particles carried thereby in generating electric energy by their high velocity movement through a magnetic field.

Abstract: Relating to a stepping motor to be used for paper feedings or type head movements in office automation apparatus such as printers or typewriters.A stator (1) is constituted by moulding stator yokes (2), (3), (4), and (5) monolithically by resin with using their inner radius as their reference, and one side of a rotary shaft (11a) of a rotor (11) is supported by a bearing (12a) of a bearing holder member (1a) which is provided on the one-side end plane of a cylinder member of sad stator (1), and at the same time, a bracket (14) holding a bearing (12b) supporting one side of the rotary shaft (11a) of the rotor (11) is inserted into an opening side inner part of said cylinder member.By the above constitution, centering of the rotary shaft can be carried out easily and the gap between the rotor and the inner radius of the stator can be maintained also easily, then as a result of it, low-cost and high-quality stepping motors can be offered.

Abstract: A linear stepping motor, including a pair of exciting iron cores having a plurality of field legs which form a plurality of denticles with a common pitch .tau.; wherein, when P is the number of poles and n is the number of phases of the linear stepping motor, the spacing of the field legs is (N+(m/n)). .tau. (where N is an integer, m is an integer, and m is an integer, and m<n); and the denticles on the pair of exciting iron cores are shifted in phase by no more than (L/P)..tau. (where L is an integer, L<P, and 2L.noteq.P).

Abstract: A permanent-magnet field synchronous motor comprises a rotor body (22) having a cylindrical outer surface. A plurality of permanent magnets (25) attached to the cylindrical outer surface of the rotor body and arranged in the circumferential direction thereof form a field system. Each of the permanent magnets has an outer surface (25b) which extends circumferentially in parallel to the cylindrical outer surface of the rotor body and also has a constant thickness in the whole thereof. The inner surface and the outer surface of each of the permanent magnets has a certain configuration, respectively, each of which is composed of a plurality of straight lines and approximates to a contour line consisting of half-sine curves (S.sub.1, S.sub.2) extending between the circumferential opposite ends of each of the permanent magnets when developed in a plane surface.

Abstract: A single-phase synchronous motor comprises a two-pole permanent-magnet rotor (5) between two electromagnetically excited stator coils (9). At the location of the median plane (33) parallel to the direction of magnetization (37) parallel to the direction of the permanent-magnet rotor (5) has a shape which deviates from a cylindrical shape and the dimension of the permanent-magnet rotor (5) in the direction of magnetization (37) is largest near the median plane (33).

Abstract: A three phase, permanent magnet rotor, AC electric motor includes a twenty-four unskewed slot stator wound in a three phase arrangement and an eight pole permanent magnet rotor in which the rotor pole pieces are unskewed and angularly displaced from equally 45.degree. spaced reference positions about the rotor by different amounts which are integral multiples of 1.875.degree.. The cogging frequency is eight times higher and the cogging torque are eighth that of a corresponding motor with a conventional permanent magnet rotor.

Abstract: A motor, comprising a rotor with eight axes of magnetization being parallel to its axis of rotation and alternately inverted; a stator having two coplanar polor pieces with interleaved pole shoes on either side of the rotor, a sinuous air gap being formed around every pole shoe and every polar piece having four pole shoes spaced apart by an angular gap twice as large as that between the adjacent axes of magnetization of the rotor, and a coil wound around a core to which the different polar pieces are magnetically connected. According to the different means it may comprise, the motor can operate in a step-by-step bipolar mode, in a step-by-step unipolar mode or in a continuous synchronous mode, with an optimum yield.

Abstract: Using a smooth laminated armature assembly, with a ferromagnetic double-helix stator shaft, provides an economical radial pole linear reluctance motor requiring no external armature bearings. The stator shaft has a double-helical screw tooth pattern cut into its surface. Spaces between screw threads are preferably filled with low permeability material. The armature assembly has radial pole laminar plates, separated by identically configured laminar spacers, separated by an insulating layer, which provides eddy current isolation, physical stability and original adjustment of laminations for overall accuracy to linear positioning, despite tolerances in the individual laminar plates. Each laminar plate has a number of inwardly projecting teeth centered about the internal channel. These internal teeth and the double helix screw teeth on the stator shaft provide flux paths through the stator.

Abstract: A stepping motor with toothed stator poles and toothed rotor poles is magnetically enhanced by locating permanently magnetized inserts in the spaces between the stator teeth and magnetizing the inserts transverse to the direction of movement of the rotor and substantially transverse to the direction in which the teeth extend. In a hybrid motor with a split and axially magnetized rotor the inserts are magnetized to oppose the magnetization of the rotor. In a variable reluctance motor with an unmagnetized rotor inserts are placed in both rotor and stator and magnetized to aid each other. Linear motors use either configuration.

Abstract: A resonant vibration-transmitting apparatus, including a yoke, a magnetic coil attached on the bottom of the yoke, a vibrant leaf spring attached to the yoke, and an iron core attached to the leaf spring in a manner that a substantial part of the iron core is placed inside the magnetic coil so as to resonate the leaf spring to the frequency of a power source.

Abstract: A linear pulse motor which includes: a primary magnetic flux generating unit composed of a pair of cores each having a coil wound therearound and pairs of magnetic poles, each pole being provided at either end portion of a corresponding core; and a scale having a row of first teeth formed therein along a direction of relative travel thereof with respect to the magnetic flux generating unit, the scale and the flux generating unit being disposed so that the scale relatively moves with respect to the primary magnetic flux generating unit by generating magnetic flux in gaps formed between the magnetic poles and the teeth facing to magnetic poles.

Abstract: A magnetic pole piece for use in a linear pulse motor which includes: a primary magnetic flux generating unit composed of a pair of cores each having a coil wound around them and pairs of magnetic pole pieces, each magnetic pole piece being provided at either end portion of a corresponding core; and a scale having a row of first teeth formed therein along a direction of relative travel thereof with respect to the magnetic flux generating unit, and scale and the flux generating unit being disposed so that the scale relatively moves with respect to the primary magnetic flux generating unit by generating magnetic flux in gaps formed between the magnetic poles and first teeth facing to the magnetic poles, the pole pieces each including the flat magnetic pole piece member having a head portion and a leg portion and are arranged on a plane with each head portion disposed close to head portions of adjacent pole piece members.

Abstract: A stator for use with a permanent magnet rotor electrical machine is disclosed which stator eliminates ferromagnetic teeth previously used in stator cores. The stator of the present invention uses a winding support structure made of non-magnetizable, non-conductive material to support the stator windings, which may advantageously be prewound prior to installation on the winding support structure. The stator is easily adaptable to liquid cooling, and has substantially reduced losses due to its toothless design.

Abstract: A magnetic battery is provided that includes a helical spring threaded onto a mnagnetic core to increase relative movement between the magnetic core and coils that may be coated with sulfer and zinc oxide to enhance electricity extracted therefrom. The magnetic battery is built into a flashlight casing so that oscillatory motion will provide electricity to operate a lamp therein.

Abstract: A collector housing over the collector and brush assembly of a dynamoelectric machine is provided with a special valve called a vacuum breaker for permitting by manual operation the alleviation of negative pressure within the housing while the machine is in operation so that the collector housing may be rolled back from its normal location for inspection and maintenance of the collectors and brushes.

Abstract: A single-phase brushless motor which can rotate smoothly with minimized torque ripples without generating a cogging torque. A magnet rotor of the motor has north and south magnetic pole and non-magnetized zones successively formed in ranges thereof each having an angular width of 120 degrees in electrical angle, and a stator armature is mounted in an opposing relationship to the magnet rotor and includes an annular stator yoke on which a same number of stator coils for each of 3 phases are wound in a troidal configuration and successively located in an angularly spaced relationship by an electrical angle of 120 degrees. A position detecting element is located for detecting a magnetic pole or non-magnetized portion of the magnet rotor, and in response to signals successively developed from the position detecting element during rotation of the magnet rotor, an energization controlling circuit successively energizes the stator coils to rotate the magnet rotor in a predetermined direction.