Abstract: A two-stator induction synchronous motor includes a unitary rotor having a first rotor assembly and a second rotor assembly each of which is formed by a permanent magnet and a rotor core. The first rotor assembly and the second rotor assembly respectively have a first pair of and a second pair of magnetic poles of the permanent magnets disposed in such a relative relation that the former and the latter are displaced by 180.degree. or 0.degree. with each other. The motor also includes a phase shifting means which produces a phase difference of 0.degree. or 180.degree. between a voltage induced in rotor conductive members by a rotating magnetic field generated around the first rotor assembly and a voltage induced in rotor conductive members by a rotating magnetic field generated around the second rotor assembly.

Abstract: An asynchronous motor comprising a stator 1, a rotor including a core 2 and a multilayer screen 3. Each layer 4 of the screen 3 is made of an iron-containing alloy of high electrical conductivity, the value of electrical conductivity in each of the succeeding layers, in the direction of the rotor axis, being assumed to be decreasing.

Abstract: A spinning or twisting element is provided with an integral asynchronous motor having a laminate stator and a laminate rotor fixed to the shaft of the element. The individual laminates of the stator and rotor are each less than 0.3 mm in thickness and the stator is provided with at least 24 slots.

Abstract: An electric motor and pump mounting bracket assembly comprising an electric motor and a bracket fastened to the motor for supporting a pump which is driven by the shaft of the electric motor. The electric motor comprises a cylindrical shell which encircles the stator of the motor and a pair of end members engage surfaces on the shell which are accurately positioned longitudinally of the shell relative to one another and relative to the axis of the shell. The end members rotatably support a shaft in concentric relation to the shell. The pump mounting bracket includes a planar surface that is accurately located parallel to and a predetermined accurate distance from the centerline of the shell to form the mounting surface for the pump. The bracket further includes an opening through which the connecting link to the shaft of the motor extends. The accurate surfaces on shell are in predetermined longitudinally spaced relation to the centerline of the opening in the bracket.

Abstract: The object of the process is to obtain an intermediate short-circuiting ring in a squirrel cage rotor by filling. It makes use of the technique consisting in automatically cutting out and assembling rotor laminations by means of a follow-on machine in which the laminations are cut out from a strip, rotated through a determined angle and provided with half-cutouts for their assembly in a packet. The process consists in eliminating at least one tooth in every two from the laminations whose position in the packet corresponds to the situation of the intermediate short-circuiting ring, and turning these laminations through an angle such that when filling is effected a continuous annular zone of nonmagnetic material is obtained.

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: To eliminate rotor reaction in an induction motor, double ring coils are wound on and through the rotor core in addition to the main coils at right angles to the main coil plane. By placement of a nonmagnetic material at the center of the rotor, the flux of the stator and rotor flows in separate paths at opposite sides of the rotor core and not through the shaft, to produce a transformer (induced) m.m.f. in the double ring coils. The flux which occurs due to the current of the transformer (induced) m.m.f. of the double ring coils extends substantially into the air gap by virtue of the nonmagnetic material to abate the effect of the rotor reaction in the air gap.

Abstract: An asynchronous electric machine, having an iron core mounted on a shaft, squirrel bars and a short circuit ring connecting the bars at both ends of the rotor, and a stator having a coil winding provided with end turns exterior of the stator. A conductive body made of magnetizable or non-magnetizable material is mounted in the field of the stray magnetic flux pattern formed by the end-turns and the short circuiting ring, to increase losses, and thereby increase starting torque.

Abstract: An end portion of a free conductor bar of a pole-face winding for the rotor of a large dynamoelectric machine includes a flat at its radially outermost extremity. The end fits loosely within an oversized hole in an amortisseur ring. The presence of the flat displaces the contact line between the end portion and the hole from a thin bridge region of the amortisseur ring to two lines of contact displaced inward into the body of the material of the amortisseur ring. The reduced contact force and the repositioning of the contact location avoids cracking in the amortisseur rings of large dynamoelectric machines.

Abstract: A single-phase, reversible induction motor, comprising two cylindrical rotors disposed side by side on the same axis of rotation, the rotors being composed of laminated iron cores and provided with grooves of the same number disposed in parallel with the shaft and on respective surfaces of the cylindrical rotors at regular intervals; two two-pole field systems respectively composed of laminated iron cores and surrounding the rotors, and coils for exciting the field systems, respectively, the field systems and the coils being arranged so that the directions of passage through the rotors of magnetic fluxes emanating therefrom be perpendicular to each other; and a switching circuit for reversing the phase of a single-phase alternating current supplied to one of the coils. Conductors of a magnetically permeable material are fixedly secured to all the grooves of one of the rotors but electrically isolated from the rotor iron core.

Abstract: A balanced, half-pitch capacitor induction motor having a stator core member with equally spaced teeth equal in number to twice the number of motor poles and with the inner ends of the teeth having equal angular extent, and a squirrel cage rotor member. The main field winding comprises serially connected coils equal in number to the number of motor poles respectively embracing alternate, consecutive ones of the teeth and being adapted to be connected across a single phase source of alternating current. An auxiliary field winding comprises serially connected coils embracing consecutive teeth intermediate the teeth having the main winding coils thereon, the auxiliary winding coils being serially connected with a phase-displacing capacitor across the serially connected main winding coils. The main and auxiliary windings have equal ampere turns and equal pitch thereby providing a balanced, half-pitch, two phase motor winding. The rotor member has its squirrel cage bars spiraled by one-tenth of a full turn, i.e.

Abstract: In an asynchronous machine including a rotor of solid iron and a squirrel cage winding, the rotor is further provided with closed slots of any cross sectional shape which receive the bars of the squirrel cage winding whose upper edge is spaced from the outer surface of the rotor by a distance which is equal to the depth of penetration a of the eddy currents generated for a given starting voltage and for a slip s.gtoreq.0.8.

Abstract: A permanent magnet rotor for a permanent magnet synchronous-run induction-state motor is disclosed. The rotor has Rare Earth magnets disposed in apertures in unitary laminations and parallel to a tangent to the shaft. The magnets are magnetized outwardly so that the direct flux of the magnets is additive to the direct axis flux of the stator at no load. The rotor has a squirrel cage winding and the ends of each magnet aperture are in communication through a flux barrier space to the inner end of an adjacent conductor bar aperture of the squirrel cage winding. The unitary laminations each have an even plurality of radially directed reinforcing ribs disposed along the magnetic neutral axes. The flux barriers are wide relative to the circumferential width of the reinforcing ribs for a minimum of circumferential leakage flux. The leakage flux from one magnet radially through a rib is in opposition to the leakage flux through that rib from the adjacent magnet for substantially zero net leakage flux therein.

Abstract: An asynchronous machine with a rated power of at least 1 MVA has a laminated stator core which supports a multiphase AC winding and a rotor surrounded by the stator core and having a length substantially greater than the length of the laminated stator core. The rotor has winding slots running axially along its whole length, each of the slots having wall portions facing each other and converging radially outward in connection with a central plane. Winding bars are arranged in the winding slots and are included in a squirrel-cage winding and fit the slot walls. An annular winding portion at each end of the rotor short-circuits the rotor bars, such winding portion lying axially within the end surface of the rotor core and outside the end surface of the stator core. The bars may be U-shaped in cross-section, with one flange of each adjacent pairs of bars located in the same winding slot. The end portions of the rotor core have annular grooves therearound.

Abstract: An arrangement for increasing the axial displacement force in a sliding armature braking motor in which an intermediate short circuit ring displaced from the end of the stack of rotor laminations is provided along with conventional short circuit rings at each end of the laminations to thereby materially increase the axial displacement force.