Abstract: A slot liner is disclosed for electrically insulating electric coils from a magnetic core. The slot liner comprises a piece of insulating sheet material having first and second sides and first and second ends. The sheet material is folded upon itself in opposite directions at each end thereof to establish end portions of double thickness. In other words, the sheet material is folded back upon itself at the first end to lie adjacent the first side thereof to form a first end portion of double thickness; and folded back upon itself at the second end to lie adjacent the second side thereof to form a second end portion of double thickness. The double thickness ends may be further folded upon themselves (but in a common direction) to establish cuffs. In other words, the first and second ends of the sheet material of double thickness may be folded back upon themselves toward the first side of the sheet material to form a cuff at each end.

Abstract: An excitation winding arrangement is provided for a synchronous electric machine having a rotor with shoeless, salient poles wherein the excitation windings are secured by slot wedges in gaps defined by the poles. Theexcitation winding arrangement includes coils which define the excitation winding and are formed by flat conductors. The flat conductors, either singly or in bundles, are held in spaced relation by respective combs at the bottom of the slots and under the slot wedge to form cooling ducts to achieve good air cooling of the excitation winding in the region of the pole gap.

Abstract: A bobbin for carrying a field coil winding is made of molded plastic resin material having good electrical insulating characteristics and having an insulating channel formed in the hollow spindle portion thereof for carrying a fuse type or one-shot thermal protector. The bobbin flanges are thickened at either end of the insulating channel and sockets are formed in the flange thickened portion for carrying a quick-connect device which is generally U-shaped with slots in the legs adapted to engage coil end-wires when the device is forced into a socket. One end of the device carries a bent-over tongue adapted for locking engagement with the stripped end of an insulated lead-wire.

Abstract: A device for securing the end connectors of an electric machine stator winding, wherein the magnetic circuit stacks thereof are clamped axially by means of elements arranged on the end surfaces of the stator core, comprises two insulating conical rings, the end connectors of the winding being arranged between the conical surfaces of the rings. The outer conical ring is connected with the clamp board and is being adapted to move axially with respect to the clamp board. The inner conical ring is retained in an axial direction by means of axially arranged rods pivotally connected with the outer conical ring by means of supports. The suports are pivotally secured in the elements axially clamping the magnetic circuit stacks by means of radially arranged rods. The proposed structure provides for dependable securing of the end connectors of the winding, such that damage of insulation and loosening are avoided during the course of operation.

Abstract: A miniature electric motor is disclosed wherein a synthetic bobbin or frame has a rotor inside of a central cylindrical cavity, the rotor being supported in bearings which include large diameter flanges bonded to the bobbin. The windings are disposed around the bearing flanges and in grooves whose bottom surfaces are tangential to the cylindrical cavity. The windings thus assist in holding the bearing flanges to the bobbin and form part of the motor framework. The angular bottom surfaces effect increase in the number of turns in the windings and effects an increase in the rotor diameter and thus in the motor torque.A ring yoke of high permeability and low remanence surrounds and is bonded to the bobbin. Attached to the inside wall of the yoke are two diametrically opposed soft iron pins located at an angle to the normal of axis of the field created by the windings to create poles for stopping the rotor at a predetermined position.

Abstract: A rotor of an alternating current generator has a field excitation assembly supported on a rotor shaft including a pair of rotor segments forming a cavity therein, a bobbin made of an insulating resin disposed in the cavity and a field excitation coil wound on the bobbin. The bobbin has a cylindrical portion and a pair of flanged portions at both ends thereof for forming room for the field excitation coil. On one of the flanged portion, a pair of projections are integrally formed therewith extending axially and outwardly, which are press-fitted into a pair of through holes formed on one of the rotor segments. Each of the projections is formed with not only an axially extending groove for receiving a field coil terminal, but a radially and axially extending slit communicating the outside of the projection with the groove for guiding and receiving a coil starting or terminating end of the field coil.

Abstract: A miniature two-phase stepping motor includes sheet metal punched or stamped pole pieces and electrical coil assemblies having injection molded coil forms. The coil forms are provided with alignment bosses or protuberances which extend through pilot openings formed in the sheet metal poles to assure and maintain accurate alignment of the poles and the motor sections. The motor bearings are similarly supported and piloted on alignment pins formed on the coil forms.

Abstract: An electromechanical driving device comprising a permanent magnet rotor mounted for rotation on a non-magnetic support plate, and a wheel train mounted on the support plate and driven by the rotor. A coreless field coil is mounted on the support plate and positioned to drive the rotor and thereby drive the wheel train when the coreless field coil is energized. The coreless coil is wound on a coil bobbin having an axial bore. The support plate includes a projecting portion dimensioned to fit within the axial bore of the bobbin to support the bobbin and thereby mount the same on the support plate.

Abstract: A generator comprises an output winding connected to input terminals of a full-wave rectifier and a field winding. A resistor and diodes are also connected to the input terminals for supplying voltage to a voltage regulator. The generator, the rectifier and the voltage regulator are assembled together within a generator housing, so that a single conducting wire is sufficient for connecting the generator and a battery. The pole cores of the generator are made of low carbon steel the residual magnetism of which has been increased by a cementation process or by insertion of high carbon steel elements.

Abstract: A sub-fractional A.C. signal generator incorporating a stator assembly comprising a coil wound upon an annular bobbin of molded insulator material, a pair of annular magnetically premeable stator members having alignment apertures snap-fit onto integral bosses projecting from the bobbin, in concentric relation in a stator sub-assembly, the two stator members affording a multiplicity of individual pole pieces interleaved one-for-one around the outer periphery of the coil. The sub-assembly and an insulator barrier are press fit onto opposite ends of a cylindrical stator support member within which a sleeve bearing is mounted to provide a complete stator assembly. A drive shaft is journalled in the stator bearing and carries an annular permanent magnet which encompasses the stator members but is spaced therefrom by a uniform radial air gap. A housing affixed to the insulator barrier encompasses rotor and stator assemblies.

Abstract: A pole assembly for a dynamoelectric machine comprising an induction coil received about a core, abutment strips connected to the core and arranged adjacent to at least one bearing surface of the induction coil, tightening bolts with internal sockets for tightening the same, which are screwed into threaded openings, there being at least one such threaded opening in each one of the strips, the bolts abutting against the bearing surface of the induction coil.

Abstract: An excitation winding arrangement is provided for low-speed synchronous machines wherein the poles are configured without pole shoes and accommodate the excitation windings. The excitation winding arrangement includes coils of flat conductors which define the excitation windings. The flat conductors are wound so that their surfaces are parallel to the walls of the poles and the coils form a self-supporting component which can be improved by hardened turn insulation. These coils are secured only at the end-faces of the poles by a mounting arrangement. Effective cooling of the coils in the pole gap is thereby achieved.

Abstract: Device for fixing winding bars on a stator of an electric rotating machine herein bundles of bars are fixed by straps pulled at their ends by a system of chocks and wedges providing also for the holding of the bundles of bars in the circumferential direction.

Abstract: A motor stator having a salient pole magnetic core on which are wound coils of conductive wire incorporating an annular printed circuit board having a plurality of radially projecting terminals. The printed circuit board is secured directly to the projecting ends of the coils at one end of the core and the two wire ends of each coil are secured to pairs of adjacent terminals on the board. External electrical leads are then threaded through the core between the coils with one end of the respective leads electrically joined to terminals on the board.

Abstract: A terminal board is provided for terminating the coil ends of a winding on an electric motor or other wound coil. The terminal board comprises a unitary structure which overlays the coil supporting structure. In a preferred embodiment, the terminal board will comprise supporting structure for multiple groups of terminals. A wing member joins together the supporting structure for each group of terminals to make a unitary terminal board. In a preferred embodiment, the terminal board is first retained in position by press fitting a boss on the underside of the terminal board into a mating hole in the supporting structure. The coils cooperate with a portion of the terminal board to provide a second retention means. The wing members comprise a thin wall structure which extends normal to the mounting plane and provides a barrier to retain the individual windings of the coils within a predetermined space. The terminals are not included on the terminal board structure when it is first mounted.

Abstract: A plurality of non-conductive rings are positioned around the outside surface which is defined by the end-winding conductors. A plurality of non-conductive flexure plates are secured to the rings and extend radially outward therefrom. The flexure plates are also secured to the generator frame by a coupling assembly which permits tangential movement and prevents axial and radial movement of the outermost flexure plate end. The plates flex in the axial direction to compensate for temperature responsive dimensional changes of the end-winding assembly.

Abstract: A rotor of a dynamo-electric machine having the conductors of the rotor winding constrained against the effects of centrifugal force by a plurality of annular members which encircle the conductors at spaced positions along the body of the rotor and are prestressed to clamp the conductors to the rotor so that no further stretching of the annular members occurs at the maximum speed of the rotor. Preferably the annular members are prestressed in situ on the rotor by expansible devices interposed between the annular members and the conductors of the rotor winding. One form of expansible device comprises an inflatable bag into which is pumped synthetic resin under pressure, the resin being cured so that it becomes solid while in the pressurized condition.

Abstract: A rotor of a dynamo-electric machine having the conductors forming an end-winding supported by an annular support arrangement interposed between an overhang region of the rotor body and the conductors forming the end winding. The annular support arrangement may comprise a single annular member or a plurality of separate members secured around the overhang region of the rotor body. The annular support arrangement may be formed from a non-magnetic metal of low density, for example, an aluminium alloy, or may be formed from a suitable insulating material, for example, a fibre reinforced composite material.

Abstract: A plurality of conductors are surrounded by a continuous, flexible belt which is doubled over to provide loops at each end thereof. Non-metallic rods are disposed through the loops for providing surfaces to which a non-metallic buckle or strap is connected for securing the belt. The belt consists of a plurality of glass fiber cords which are surrounded by a cured elastomeric material. The cords are formed from glass fiber strands which are twisted sufficiently to provide the desired amount of belt strength and flexibility.

Abstract: End winding conductors are attached to bracing rings which are connected to a plurality of support brackets positioned around the outside of the conductors. The support brackets are attached to a ring-shaped member which has its radial movement restrained by a plurality of blocks which are positioned around the outside of the ring-shaped member. The blocks are adjustably attached to another ring which is fixed to the stator iron core. Springs are positioned between the ring-shaped member and the stator iron core to provide an axial load on the support brackets. Conductor movement due to thermal changes is prevented in the radial direction but permitted in the axial direction due to the axial movement of the ring-shaped member with respect to the blocks.

Abstract: An electric machine, particularly a miniature electric motor, includes a stator structure provided with at least one pair of main poles and at least one pair of auxiliary poles, the auxiliary poles alternating with the main poles. Each main pole is comprised of a main pole core and a main pole winding on the respective main pole core. Each auxiliary pole is comprised of an auxiliary pole core and an auxiliary pole winding on the respective auxiliary pole core. A holding arrangement holds the auxiliary pole windings in place on the auxiliary pole cores and includes holding fingers extending in direction parallel to the axis of the stator structure into the intermediate spaces between adjoining main and auxiliary pole windings, and furthermore includes a holding ring to which the holding fingers are connected at one end, the holding ring lying against one axial side of the stator structure.

Abstract: In order to support the coil ends of liquid-cooled stator windings of turbo generators or the like, the coil ends or conductor bars are disposed between a support ring and segment-shaped cover plates. The support ring and cover plates extend about complete circumferences and the conductor bars of the coil ends are rigidly clamped against the support ring by means of clamping bolts which engage the cover plates and the support ring.

Abstract: A coil bobbin for a sub-fractional horsepower motor is formed with a cavity in one flange opening outward from the flange rim, a partition dividing the cavity into two chambers. One chamber has a cross-sectional shape adapted to receive a thermal sensing device and the other has a cross-sectional shape adapted to receive an insulated terminal wire. The thermal device has a metal body as one terminal of the device and a projecting rectangular metal portion as the other terminal. One start wire of the coil is wound around or otherwise secured to the projecting terminal and the thermal device is inserted into one chamber from the open end. The partition is partially slotted and the stripped end of the lead wire is inserted in the other chamber from the other end, the stripped and bent-over end of the lead wire extending through the slot. As the thermal device is pushed into its chamber its metal body forces the stripped end against the partition and into electrical connection with the stripped end.

Abstract: A winding conductor is surrounded by a continuous, flexible belt which is doubled over to provide loops at each end thereof. A non-metallic rod is disposed through the loops and through an opening in an adjacent supporting member. A wedge is inserted in the opening to move the rod and produce tension in the belt for forcing the conductor tightly in a radial direction against the supporting member. The belt consists of a plurality of glass fiber cords which are surrounded by a cured elastomeric material. The cords are formed from glass fiber strands which are twisted sufficiently to provide the desired amount of belt strength and flexibility.

Abstract: In accordance with the present invention there is provided improved winding retention means for the field coils in the stator of a rotary electric machine, particularly for coils which are wound in place on the field core by an automatic winding machine. As is well known, winding guides are temporarily secured at each axial end of the stator poles. The shuttles of the winding machine wind successive turns of wire around the poles and in the space between the latter and the winding guides. The retention means includes insulated flat steel wire or strips which .[.are secured to the core as by extending.]. .Iadd.extend .Iaddend.through passages or slots formed in the core laminations. These strips extend out from .[.opposite ends of.]. the core .[.and.]. .Iadd.in both directions and are bent to form off-sets which bear against opposite ends of the core to prevent longitudinal displacement of the strips in the apertures. The end portions of the strips beyond the off-sets extend .Iaddend.