Abstract: Salient-pole shaded pole motors with multiple short circuited shading coils on each pole piece are disclosed wherein the pole pieces extend generally radially from the geometric center of the magnetizable yoke. The pole pieces are interconnected by a magnetic yoke that encompasses the pole pieces as well as a rotor. Adjacent pole tips of pole pieces are displaced in space from one another and are separated by air gaps. Among other things, this facilitates placement of concentrated winding means about the pole pieces. The leading edges or pole tips of the pole pieces exhibit a relatively high reluctance as compared to the center portion or region of the pole pieces. Also disclosed are methods of making multiple shading coil motors. Preferred forms include parallel disposed pairs of shading coils on each trailing pole tip which facilitates manufacture of motors. In addition, all of the coils are preferably made to be the same size in cross section to further facilitate manufacturability.

Abstract: A single phase induction motor of a capacitor run type comprising: a stator including a stator core having a circle aperture and a plurality of slots formed extending in the axial direction of the aperture whereby a plurality of teeth are formed therebetween, two main winding coils wound around two teeth to form two main excited poles of the same polarity at the diametrical positions of the stator core, the two main excited poles of one polarity causing two main image poles of the opposite polarity at the positions between the excited poles, two auxiliary winding coils wound around two teeth, shifted by one tooth from those of the main winding coils, to form two auxiliary excited poles of the same polarity at the diametrical directions of the stator core, the two auxiliary excited poles of one polarity causing at least two auxiliary image poles of the opposite polarity at the positions between the auxiliary excited poles, whereby two pairs of main and auxiliary excited and image poles are formed sequentially

Abstract: A hoist brake unit having a shading coil mechanically locked into the core of the brake unit's electromagnet. The mechanical lock is achieved by passing the coil through a cavity in the core having intervening core material between the cavity and an external surface of the core.

Abstract: One disclosed motor includes winding leg and yoke laminations that form a core yoke section and a core winding leg (or coil core). An excitation coil is supported on the coil core; and the coil core and core yoke are relatively oriented so that a first surface of the original strip material faces one direction in the core yoke section, and an opposite direction in the winding leg section in a finished motor. The geometrical configuration of the laminations prevent a random location of winding legs relative to yoke laminations, and yet permits two distinctly different relative lamination orientations. A longitudinal reference line along the winding leg is identified and keying or interlocking means are symmetrical about the reference line, but a winding accommodating portion of the winding leg is asymmetrical about the same reference line, so two distinct winding window openings may be provided, depending on the orientation of the winding leg.

Abstract: Salient-pole shaded pole motors with multiple short circuited shading coils on each pole piece are disclosed wherein the pole pieces extend generally radially from the geometric center of the magnetizeable yoke. The pole pieces are interconnected by a magnetic yoke that encompasses the pole pieces as well as a rotor. Adjacent pole tips of pole pieces are displaced in space from one another and are separated by air gaps. Among other things, this facilitates placement of concentrated winding means about the pole pieces. The leading edges or pole tips of the pole pieces exhibit a relatively high reluctance as compared to the center portion or region of the pole pieces. Also disclosed are methods of making multiple shading coil motors.

Abstract: An electric motor or other electric rotating machine in which certain of the stator poles are of hardened magnetic material to provide the machine with a unidirectional self-starting characteristic. In certain preferred embodiments the housing for the motor is of nonconductive material, and two of the stator pole pieces protrude through the housing and serve as electrical terminals. The housing encloses a spool or bobbin which supports the energizing winding for the motor as well as a reduction gear train which advantageously is mounted on one of the flanges of the bobbin.

Abstract: A two part laminated stator in which a ring portion, bearing shading coils, has a pair of spaced parallel legs projecting therefrom, each leg end being adapted for a welded connection with a corepiece end, the corepiece being adapted to be inserted in an axially extending hole in a bobbin on which a coil has been wound. Each leg end and each polepiece end is shaped to have a complementary line of contact shaped for full line contact without interference as the corepiece, bearing the wound bobbin, and the leg ends are pressed together in opposite directions parallel to the line in which the legs project. The two parts and the laminations of each part are then secured together along a strip weld across the outer edge of the laminations at the outer end of the line of contact for each leg and each polepiece end.

Abstract: A laminated core for an A.C. electromagnet comprising its own die for the casting of shading coils therein. Retention grooves formed across the laminations and retention slots formed in side plates provide a continuous path for the injection of molten metal therein, thereby producing a closed-loop shading coil when solidified. Also disclosed is a method for making a core having a shading coil cast in situ.

Abstract: The novel reversible shaded-pole motor has a stator lamination which is symmetrical about the horizontal and vertical magnetic axes. The lamination shape corresponds to two E's placed against each other. In the center, it has a circular hole for receiving the squirrel-cage rotor. Yoke parts are placed on the open sides of the E and four like coils traversed by the yoke parts are inserted in the windows obtained at the corners of the stator lamination. Shading rings are slipped over the central short legs of the E's. For the operation of the motor in each direction of rotation, two diagonally opposed, series-connected coils are connected directly to the single-phase mains, while the other two are connected to the single-phase mains via a resistor.

Abstract: A two-pole off-set construction of an electric motor has winding portion laminations and rotor portion laminations which are separate so that the winding may be formed or placed on the winding portion and then the two portions of the stator interconnected to complete the flux path for the rotor circumscribed by a rotor aperture in the rotor portion. There must be a window space between these two portions to accommodate the winding on the winding portion and formerly the metal removed from this window space was scrap metal, necessitating an excessive amount of steel lamination material. In this invention, the layer of lamination is made in two complementary pieces and this layer has a rotor portion and a winding portion. The two separate lamination pieces for a layer of complete lamination are to permit the winding to be placed on this complete stator.

Abstract: Fractional horsepower induction motors having a fixed number of poles (and, accordingly, a single no load synchronous speed) that are particularly adapted for multi-speed operation when driving a fan load by changing the field strength of the main winding. Induction motors of N fundamental poles have squirrel cage rotor having a plurality of interrelated conductor bars and end rings that are arranged so that multiple sets of the rotor bars establish a predetermined number of separately identifiable cage sets such that the fundamental pole structure of the stator field is coupled with the rotor and such that the third harmonic of the stator field is not coupled with the rotor. The rotor slot number and total number of separately identifiable cage sets are selected so that a cage set pattern is provided that has two-thirds of a fundamental pole pitch.

Abstract: A stator assembly for a two-pole, shaded pole motor which comprises a stator core member having four salient pole pieces each having a shank portion and a pole face portion. An opposite two of the poles have shading coils thereon, the other two poles being unshaded. A field coil is wound directly on the shank portion of each of the pole pieces, one pair of coils respectively on an adjacent two of the pole pieces being connected so that upon energization thereof, the two pole pieces are polarized in the same sense, the remaining pair of coils on the other two pole pieces being connected so that upon energization, the other two pole pieces are polarized in the opposite sense.

Abstract: A shaded pole electric motor comprising a rotor, a stator. The stator has a plurality of generally radially extending poles each with a neck portion of lesser circumferential extent than the radially innermost ends of the poles. Adjacent neck portions of the poles form a kidney slot for receiving portions of stator windings. A main winding is wound around the neck portion of each pole. A shading coil slot which has its radially innermost end nearer the pole center than its radially outermost end. A shading coil and winding is positioned in such a manner that no portion of the main winding overlies the axially outer ends of the shading coil.

Abstract: A shaded pole motor having a shading loop or band that fits with an interference fit adjacent the field plate stack of laminations at the location thereon adjacent the field winding, but having ample clearance space from the stack adjacent the ends of the stack; whereby an epoxy coating can be used to insulate the stack and shading loop from the windings. The shading loop adjacent the ends of the stack further projects well beyond the ends of the stack distances comparable to the breadth of the winding, whereby the winding is mechanically constrained on the stack in part by the shading loop.

Abstract: Salient-pole shaded pole motors with multiple short circuited shading coils on each pole piece; the pole pieces extending generally radially from the geometric center of the magnetizeable yoke. Pole pieces are interconnected by a magnetic yoke that encompasses the pole pieces as well as rotor. Adjacent pole tips of pole pieces are displaced in space from one another to, among other things, facilitate placement of concentrated winding means about the pole pieces. The leading edges or pole tips of the pole pieces exhibit a relatively high reluctance as compared to the center portion or region of the pole pieces.

Abstract: A single-phase induction motor provides a plurality of serially connected main winding coils and a plurality of corresponding auxiliary winding coils each spaced in quadrature from a corresponding main winding coil. Each auxiliary winding coil is energized by the current induced in a serially connected pick-up coil located within a stator slot containing the quadrature main winding coil in response to the energization of the main winding coil for providing a starting torque to the rotor. Each auxiliary coil contains a first predetermined number of turns wound in a first direction within one stator slot and a second predetermined number of turns wound in a second direction located in an adjacent stator slot for increasing the resistance-to-reactance ratio. Each pick-up coil contains approximately one-half the turns of each auxiliary coil which, in turn, has a substantially lesser number of turns than each main coil.

Abstract: Salient-pole shaded pole motors with multiple short circuited shading coils on each pole piece; the pole pieces extending generally radially from the geometric center of the magnetizeable yoke. Pole pieces are interconnected by a magnetic yoke that encompasses the pole pieces as well as rotor. Adjacent pole tips of pole pieces are displaced in space from one another to, among other things, facilitate placement of concentrated winding means about the pole pieces. The leading edges or pole tips of the pole pieces exhibit a relatively high reluctance as compared to the center portion or region of the pole pieces.