Variable Length Or Tapped Windings Patents (Class 310/200)
  • Patent number: 8890387
    Abstract: An armature core of a stator has an annular portion and a plurality of teeth extending radially from the annular portion. A segment coil is configured by electrically connecting a plurality of segment conductors together. The segment conductors extend axially through slots S, each of which is defined between each adjacent pair of the teeth. Each of the teeth has a width adjustment portion for decreasing a slot width in a direction perpendicular to a radial direction in the radially inward direction.
    Type: Grant
    Filed: June 18, 2012
    Date of Patent: November 18, 2014
    Assignee: Asmo Co., Ltd.
    Inventors: Yoshimasa Kinpara, Noriyasu Nishio, Takahiro Yamamoto
  • Patent number: 8884486
    Abstract: A method for regulating the reactive power generated or absorbed by a synchronous electric generator includes regulating a quantity of coils disposed in line with a stator winding. Additionally, a generator operating point of the generator is regulated.
    Type: Grant
    Filed: February 22, 2011
    Date of Patent: November 11, 2014
    Assignee: Alstom Technology Ltd.
    Inventor: Johann Haldemann
  • Patent number: 8575809
    Abstract: It is described a stator for an energy converting apparatus, the stator comprising the stator including a support structure having an annular shape around an axial direction; a first protrusion coupled to the support structure and extending radially from the support structure; a second protrusion coupled to the support structure and extending radially from the support structure, the second protrusion being spaced apart from the first protrusion in a circumferential direction; and a first wire arranged between the first protrusion and the second protrusion in a plurality of first radial layers located at different radial positions and configured such that a circumferential extent of a cross-sectional area of the first wire increases radially outwards. Further is described an energy converting apparatus including the stator, and a wind turbine including the energy converging apparatus.
    Type: Grant
    Filed: February 21, 2011
    Date of Patent: November 5, 2013
    Assignee: Siemens Aktiengesellschaft
    Inventor: Henrik Stiesdal
  • Patent number: 8497616
    Abstract: Embodiments are directed to an expander having two or more hydraulic stages with different physical geometries. In an embodiment, a first hydraulic stage uses nozzle vanes machined with a first geometry, while a second hydraulic stage uses nozzle vanes machined with a second geometry. Different nozzle vanes can be combined to tune the performance of the expander as the optimal operating conditions change. In yet another embodiment, an expander is equipped with a generator having a double wound stator with two sets of parallel windings. For high operating loads greater than a threshold, a first set of windings operates while a second set of windings, operating at a lower frequency, is disconnected. For operating loads that are less than the threshold, the first set of windings is disconnected and the second set of windings operates, enabling the generator to continue to operate close to 100% load for less expander power.
    Type: Grant
    Filed: April 29, 2011
    Date of Patent: July 30, 2013
    Assignee: Ebara International Corporation
    Inventor: Michael Lee Cords
  • Patent number: 8497614
    Abstract: A segmented annular stator for a dynamo-electric machine is disclosed which simplifies transport and assembly of the machine. The segment has a cross section essentially shaped as a circular arc and includes a first and a second segment boundary configured for attachment to an additional segment, a corresponding coil associated with each phase of a three-phase system, a first conductor, and a second conductor. The first conductor is connected to the second conductor via an end connection in an area of end windings, such that a first coil associated with a first phase surrounds second and third coils associated with second and third phases of the three-phase system.
    Type: Grant
    Filed: July 12, 2010
    Date of Patent: July 30, 2013
    Assignee: Siemens Aktiengesellschaft
    Inventors: Axel Möhle, Rüdiger Schäfer
  • Patent number: 8493017
    Abstract: The invention relates to an electrical drive having a motor with a rotor and a stationary stator, which has a coil arrangement, and having a motor controller for controlling the motor, with the motor controller being configured to pass current through the coil arrangement in order to produce an excitation field, with the coil arrangement having a plurality of coil winding sections, and with each coil winding section having a plurality of coil sections, wherein the polarity of at least one coil section of the plurality of coil sections of each coil winding section can be selectively reversed with respect to the other coil sections of the coil winding section. The drive is particularly suitable for use for an electrical tool.
    Type: Grant
    Filed: September 2, 2011
    Date of Patent: July 23, 2013
    Assignee: C. & E. Fein GmbH
    Inventor: Lothar Dietl
  • Patent number: 8368275
    Abstract: A stator for a multi-phase electric motor comprises a plurality of teeth for each phase. The windings on two teeth from one phase are formed from a single length of conductor. The windings on a first one of the teeth being formed at least in part from two sections of the conductor spaced apart along the length of the conductor, and the windings on a second one of the teeth being formed from an intermediate section of the conductor between the spaced apart sections.
    Type: Grant
    Filed: May 4, 2007
    Date of Patent: February 5, 2013
    Assignee: TRW Limited
    Inventors: Andrew Lee Court, Jeffrey Ronald Coles
  • Publication number: 20120280581
    Abstract: Machines and motors with multiple three-phase AC power connections. A motor includes first, second, and third windings arranged to drive a rotator shaft. A first end of each winding is connected to a respective power input of a three-phase alternating current (AC) power source and a second end of each winding is connected to a neutral. The motor includes at least one intermediate tap connected to each of the first, second, and third windings at substantially equal respective distances between the neutral and the respective power inputs. The intermediate taps together provide a three-phase AC power output at a voltage that is less than the voltage of the three-phase AC power source.
    Type: Application
    Filed: May 3, 2011
    Publication date: November 8, 2012
    Applicants: Siemens Product Lifecycle Management Software Inc., SIEMENS INDUSTRY, INC.
    Inventors: Nicholas G. Lang, William R. Finley
  • Patent number: 8269387
    Abstract: A rotating electric machine includes an annular stator including a coil formed by winding a part of a coil wire around a stator core, and the coil wire includes the coil wound around stator teeth, a terminal portion drawn out from one end portion of the coil over a yoke portion, and a wiring drawn out from the other end portion of the coil over the yoke portion and connected to a terminal portion of another coil wire including another coil provided at a distance from the coil in a circumferential direction of the stator.
    Type: Grant
    Filed: October 16, 2008
    Date of Patent: September 18, 2012
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Yasuhiro Endo, Eiji Yamada
  • Patent number: 8174159
    Abstract: An electrical motor or generator asymmetrical armature winding configuration generating a multi-phase balanced power output. Each winding group for each pole, and the conductors constituting each winding group, are chosen individually according to their magnetomotive force (MMF) vector relationship to provide a balanced power output even though the individual windings may not be balanced or symmetrical.
    Type: Grant
    Filed: July 17, 2008
    Date of Patent: May 8, 2012
    Assignee: Honeywell International, Inc.
    Inventors: Ming Xu, Wayne Pearson, Cristian Anghel
  • Publication number: 20110316454
    Abstract: The present invention relates to an alternating-current electric motor of a combined electric device for powering and charging, the said electric motor being formed by a stator connected to an electricity network of which the number of phases is lower than the number of phases of the said motor, the said charging current of the said network being injected via a connection point dividing each phase of the said stator connected to a phase of the said network into two half-windings, the said motor being characterized in that each half-winding of a phase comprises a plurality of coils wired together so as to reduce the magnetic linkage of each half-winding at the said connection point so that there exists an apparent non-zero inductance at the said connection point in charging mode of the said device.
    Type: Application
    Filed: June 24, 2011
    Publication date: December 29, 2011
    Inventors: Boris Bouchez, Luis de Sousa
  • Patent number: 8072190
    Abstract: A method of and a system for controlling a permanent magnet AC generator (10), wherein the generator is provided with stator windings and permanent magnets in the rotor and wherein the generator is connected to a drive unit (50), wherein the generator is further provided with a semiconductor converter provided with AC output connected to the generator output and a DC link for controlling the output voltage of the generator, and the converter is further provided with filter means for filtering the output of the converter so that a filtered output of the converter is fed to the generator output.
    Type: Grant
    Filed: May 18, 2007
    Date of Patent: December 6, 2011
    Assignee: The Switch High Power Converters Oy
    Inventors: Pasi Törmänen, Dejan Schreiber
  • Publication number: 20110057597
    Abstract: The invention relates to an electrical machine and to a method for the operation thereof, particularly as a drive motor for an electrical tool or as starter generator for a motor vehicle. The electrical machine includes a rotor excited by a permanent magnet and a stator carrying a multi-phase winding, and operates in a voltage-controlled, lower rotational speed range via a transformer on a DC voltage source. The electrical machine can also be operated in a higher rotational speed range by field weakening, and the structure of the machine can be changed by reducing the flux linkage between the rotor and the stator in order to weaken the field. Preferably, the change to the structure of the machine is carried out by turning off winding parts or by switching them between series and parallel connections.
    Type: Application
    Filed: July 7, 2008
    Publication date: March 10, 2011
    Inventors: Volker Bosch, Kurt Reutlinger
  • Patent number: 7888836
    Abstract: A direct current motor including a rotor, a stator, a brush holder, and a brush. The rotor includes a core, a plurality of commutator segments, and a plurality of segment coils. The core has a plurality of teeth arranged along a circumferential direction of the rotor. A slot is formed between adjacent ones of the teeth in the circumferential direction. The plurality of commutator segments are arranged along the circumferential direction of the rotor inward from the plurality of teeth in the radial direction of the rotor. Each segment coil includes a plurality of segment conductors electrically connected to each other. The plurality of segment conductors in each segment coil extends through the slots along the axial direction of the rotor.
    Type: Grant
    Filed: April 11, 2008
    Date of Patent: February 15, 2011
    Assignee: Asmo Co., Ltd.
    Inventor: Shinji Santo
  • Patent number: 7791242
    Abstract: An electromagnetic apparatus has a rotating element acting as a transfer bridge between two active energetic suppliers, the rotating element providing a ferromagnetic core with plural solenoid coils having induced electric energy from external permanent magnets; the core transferring energy by induction to the inner stator's wound active permanent magnet, the energy collector and inductor acting as a generator.
    Type: Grant
    Filed: August 22, 2005
    Date of Patent: September 7, 2010
    Inventor: Dumitru Bojiuc
  • Patent number: 7348703
    Abstract: A pair of stators produce a magnetic field within a space between them a ferromagnetic toroidal rotor is rotationally mounted within the magnetic field. A plurality of windings are wound radially on the rotor and each winding provides a plurality of coils. Each of coils is interconnected through a switch, the switch configured for placing each of the coils within each winding alternatively in one of an electrical series connection, an electrical parallel connection, and an electrically isolated connection, so that when operated as a generator, a selected output voltage and current are produced by rotor rotation and when operated as a motor a selected output speed and torque are produced.
    Type: Grant
    Filed: August 22, 2005
    Date of Patent: March 25, 2008
    Inventor: Dumitru Bojiuc
  • Patent number: 6995546
    Abstract: An alternating current generator of the invention has three armature windings, which are wound from a winding start end connected to a neutral point to winding finish ends, and a stator that is connected to the neutral point in Y-connection at a phase difference of 120 degrees, respectively, and configures a three-phase power source, wherein the generator comprises two taps provided at predetermined positions from the winding start end to the winding finish ends of two armature windings out of the three armature windings, and wherein one terminals of the two armature windings are connected to relevant ones of the two taps and the other terminals of the two armature windings are made single-phase output terminals.
    Type: Grant
    Filed: April 29, 2004
    Date of Patent: February 7, 2006
    Assignee: Shindaiwa Kogyo Co., Ltd.
    Inventor: Takayuki Fujikawa
  • Patent number: 6879075
    Abstract: A permanent magnet synchronous machine with improved torque and power characteristics. A circumferential-oriented rotor assembly is provided with alternating permanent magnets and magnetic pole pieces. In order to reduce the amount of leakage flux in the rotor and increase the effective length of the permanent magnet, a trapezoidal or otherwise tapered permanent magnet structure is used. By alternating trapezoidal permanent magnet, and magnetic pole pieces, a higher intensity magnetic field is created in the air gap utilizing the same radial space in the motor without altering the weight or volume of the motor compared to conventional machines.
    Type: Grant
    Filed: January 31, 2003
    Date of Patent: April 12, 2005
    Assignee: Curtiss-Wright Electro-Mechanical Corporation
    Inventors: Raymond Mark Calfo, Mark Peter Krefta
  • Patent number: 6777846
    Abstract: A vehicle including a plurality of wheels, an internal combustion engine having a drive shaft interconnected to drive at least one of the wheels, a stator having a core disposed next to the engine and a plurality of wires disposed on the core in a three phase winding arrangement, and a flywheel-rotor apparatus surrounding at least a portion of the stator and having an aperture that receives the drive shaft. The flywheel-rotor apparatus is operable to magnetically interact with the stator to produce a three-phase alternating current in the wires, and provides an inertia to the internal combustion engine. The vehicle further includes power circuitry electrically connected to the wires. The power circuitry receives the three-phase alternating current and controllably generates a single-phase alternating current.
    Type: Grant
    Filed: December 14, 2001
    Date of Patent: August 17, 2004
    Assignee: Briggs & Stratton Corporation
    Inventors: John Feldner, Robert E. Rose, Sr.
  • Patent number: 6770998
    Abstract: The inner-rotor motor of the invention includes a rotor having plural magnetic poles disposed circumferentially, and a stator having a stator core with plural magnetic pole teeth facing to the rotor, located outside a circumference of the rotor, which have coils each wound around thereof. In this construction, the stator is placed within a central angel 180° with regard to a rotational center of the rotor, and the coils are set such that the numbers of turns of adjacent coils are unequal, and respective sums of the numbers of turns of the coils in respective phases are equal.
    Type: Grant
    Filed: February 7, 2002
    Date of Patent: August 3, 2004
    Assignee: Alps Electric Co., Ltd.
    Inventor: Tomokuni Wauke
  • Patent number: 6581270
    Abstract: The invention relates to a procedure for preparing the windings for an electric motor. The magnetic core (20) of the stator and/or rotor of the motor is provided with slots (24,25) in which winding coils (2; 5,7;15,17) can be fitted. According to the invention, the winding coils (2) are wound from winding wire and shaped substantially into their final form, the cross-section of the coil sides (15,17) corresponding to the space reserved in the slot (24,25) for the coil. The winding coils (15,17) are fitted in place in the slots (24,25) provided in the magnetic core.
    Type: Grant
    Filed: January 6, 2000
    Date of Patent: June 24, 2003
    Assignee: Kone Corporation
    Inventors: Esko Aulanko, Panu Kurronen, Marko Tulander
  • Patent number: 6414412
    Abstract: A variable speed motor includes a motor body having an axis, and a plurality of coil mounting parts that extend radially and that are angularly spaced apart relative to the axis. A run coil is mounted on the coil mounting parts. A starting winding includes first, second and third speed-changing coils mounted on the coil mounting parts, a set of first taps provided respectively on two coil terminals of the first speed-changing coil, a set of second taps provided respectively on two coil terminals of the second speed-changing coil, and a set of third taps provided respectively on two coil terminals of the third speed-changing coil. Each of the first, second and third speed-changing coils spans an angular length relative to the axis that is substantially equal to that spanned by the run coil.
    Type: Grant
    Filed: August 21, 2000
    Date of Patent: July 2, 2002
    Inventor: Chung-Hsin Hao
  • Patent number: 6331760
    Abstract: An improved induction motor having at least one capacitive element electrically connected in parallel with and tapped to each phase of a delta- or wye-wound stator winding such that the capacitive elements are alternately charged or discharged during operation, thereby storing energy from and releasing energy to the windings. This alternate energy storage and release assists in controlling the level of magnetic core saturation and increasing motor efficiency under all operating conditions due to reduced hysteresis and eddy current losses. Motor starting or inrush current is also substantially reduced using this arrangement. In one embodiment, variable capacitors and switch elements are used to provide the ability to dynamically “tune” the motor winding for optimal efficiency.
    Type: Grant
    Filed: October 6, 1998
    Date of Patent: December 18, 2001
    Inventor: Oscar B. McLane, Jr.
  • Patent number: 6114782
    Abstract: Disclosed is a stator of 2-phase step motor that has 4 stator coils, two in each phase. The coils are wound around 8 stator poles in a standard bifilar winding pattern. The first center-tap of the first phase and the second center tap of the second phase are connected. One end of the first phase makes a first terminal. One end of the second phase makes a second terminal. The other end of the first phase and the other end of the second phase are connected to make a third terminal. A three-phase driver can drive the step motor via these three terminals. Performance of the stator of the step motor can be improved by increasing the number of turns of the two coils whose ends make the first and second terminals. Then the three phase resistances of the stator can be adjusted to have similar resistances by reducing the wire gauge of the other two coils. This reduction of the wire size compensates for the space needed for the increase in the numbers of coil turns mentioned above.
    Type: Grant
    Filed: September 30, 1999
    Date of Patent: September 5, 2000
    Inventors: Ted T. Lin, Ryan C. Lin
  • Patent number: 6029338
    Abstract: In a binding (19) for winding overhangs (20) of rotors (1) of electric machines, essentially comprising a plastic matrix with fibrous material embedded therein, the binding (19) is formed by winding a fiber tape (15) onto the winding overhang (20). The plastic matrix is composed of a thermoplastic. Furthermore, a method is described for applying the fiber tape to the winding overhang of an electric machine.
    Type: Grant
    Filed: January 29, 1999
    Date of Patent: February 29, 2000
    Assignee: ABB Research Ltd.
    Inventors: Werner Heil, Vishal Mallick, Fran.cedilla.ois Meynard, Karl Parfrey, Herbert Prenner
  • Patent number: 6008560
    Abstract: A motor with a switching power converter is connected to a power source for supplying power to the motor. The converter has a motor terminal selectively connected to a voltage bus. A stator core has a stator body supporting a plurality of poles. A rotor is in magnetic coupling relationship with the stator core. A stator winding has a first termination and a second termination and is wound on one of the poles such that the first termination is closer to the one pole than the second termination. The first termination is electrically connected to a neutral terminal. The second termination is electrically connected to the motor terminal of the switching power converter. Parasitic capacitance associated with the second termination and EMI caused by such parasitic capacitance is minimized as compared to the parasitic capacitance occurring if the second termination is connected to the neutral terminal and the first termination is connected to the motor terminal. A method of assembling is also described.
    Type: Grant
    Filed: February 13, 1998
    Date of Patent: December 28, 1999
    Assignee: General Electric Company
    Inventor: Roger C. Becerra
  • Patent number: 5986380
    Abstract: An end turn arrangement for turns in a rotor where individual windings are stacked in tapered radial slots in the rotor, with successive turns having a smaller width in a radial inward direction, the end turns of the individual turns of each stack being vertically aligned along a common edge. The end turns are separated by blocking separators, each including a first anchor component having a first planar exterior surface and a second planar interior engagement surface; and a second slide component having a first non-planar exterior surface and a second planar interior engagement surface; the anchor and slide components having mating guide elements permitting the anchor and slide components to move relative to each other along a straight assembly path.
    Type: Grant
    Filed: August 26, 1998
    Date of Patent: November 16, 1999
    Assignee: General Electric Co.
    Inventors: Christopher Anthony Kaminski, Steven Charles Walko, Robert Francis Lloyd
  • Patent number: 5866964
    Abstract: A reluctance machine system including a reluctance machine having a rotor and a stator including at least one phase winding and a full pitch auxiliary filed winding where constant currents are established in the auxiliary field winding to assist in the establishment of a magnetic field in the machine so as to improve the machine's performance. Alternate embodiments are disclosed wherein the auxiliary field winding is positioned in a conventionally-shaped stator with phase windings of different types (e.g., short-pitched and fractional-pitched).
    Type: Grant
    Filed: November 20, 1996
    Date of Patent: February 2, 1999
    Assignee: Emerson Electric Company
    Inventor: Yue Li
  • Patent number: 5821660
    Abstract: A brushless direct current motor includes a permanent magnet rotor and a set of stator windings. The motor further includes a circuit for changeably connecting the set of stator windings to operate in a first electrical configuration or a second electrical configuration. In the second electrical configuration, the circuit connects only some of the stator windings for receiving current. The circuit electrically isolates the unused stator windings from the used or connected stator windings.
    Type: Grant
    Filed: March 5, 1997
    Date of Patent: October 13, 1998
    Assignee: MTS Systems Corporation
    Inventor: William G. Anderson
  • Patent number: 5576585
    Abstract: Armatures for dynamo-electric machines are balanced during manufacture by measuring the unbalance of the armature assembly prior to winding the coils on the armature. The numbers of turns of wire in at least some of the coils subsequently wound on the armature are then adjusted so that the unbalance of the resulting coils compensates for the unbalance of the armature prior to coil winding. Alternatively, one or more extra turns of wire that are short-circuited at the commutator may be added to help balance the armature. In addition, masses may be added to the armature to ensure that it is balanced dynamically as well as statically.
    Type: Grant
    Filed: February 7, 1994
    Date of Patent: November 19, 1996
    Assignee: Axis USA, Inc.
    Inventors: Giuseppe Cardini, Federico Sbalchiero, Sabatino Luciani
  • Patent number: 4906060
    Abstract: Method and apparatus for controlling the output frequency of an alternator by maintaining a relatively constant speed of rotation of the alternator rotor are disclosed. The rotor includes an annular stator and a rotor rotatably mounted within. In one embodiment the stator winding is comprised of a plurality of discrete polyphase windings positioned within discrete annular segments of the stator. When the actual rotor speed is below the desired speed, selected stator units are de-energized to decrease the strength of the stator magnetic field, thereby permitting the rotor speed to increase. When the actual rotor speed is greater than the desired speed, selected stator units are energized to increase the strength of the stator magnetic field, thereby exerting a braking force on the rotor to slow it down. In another embodiment each phase of the polyphase stator winding includes a plurality of inductor coils.
    Type: Grant
    Filed: March 23, 1989
    Date of Patent: March 6, 1990
    Assignee: Twind Energy Corporation
    Inventor: David L. Claude
  • Patent number: 4841188
    Abstract: A speed-changing device for electric ceiling fans includes a run coil for electrical connection to a motor of a ceiling fan, and a starting and speed changing coil, together with a starting capacitor, parallel-connected to the coil. The starting and speed-changing coil includes a set of medium-speed taps and a set of low-speed taps, forming three speed-changing coils, in which speed-changing connections can be switched without producing any noise from the motor, by maintaining the same current direction after switching.
    Type: Grant
    Filed: November 25, 1987
    Date of Patent: June 20, 1989
    Inventor: Chung-Hsing Hao
  • Patent number: 4528485
    Abstract: An electronically commutated motor for energization by DC in both a high speed mode and a low speed mode at a current not significantly greater than a preselected level. The motor stator has a plurality of winding stages each with a plurality of winding turns only a first portion of which is commutated in a first sequence in a high speed mode and a predeterminately greater portion of which is commutated in a second sequence different from the first when the motor is energized in the low speed mode. A permanent magnet rotor is rotatably driven in one direction in the high speed mode so as to develop a first torque at the preselected current level when only the first portion of the winding turns of the winding stages are commutated in the first preselected sequence.
    Type: Grant
    Filed: April 13, 1982
    Date of Patent: July 9, 1985
    Assignee: General Electric Company
    Inventor: John H. Boyd, Jr.
  • Patent number: 4429206
    Abstract: A minimum loss multilayer solenoid for induction heating is characterized by the ampere-turns carrying the same current per conductor from one layer to the next on account of the dimensioning of the conductors having width and thickness varying monotonically in opposite directions across the layers. Central cooling for the conductors is accommodated in the parallel layers with sectional distribution of the cooling medium.
    Type: Grant
    Filed: March 16, 1982
    Date of Patent: January 31, 1984
    Assignee: Westinghouse Electric Corp.
    Inventor: Richard E. Kothmann
  • Patent number: 4395669
    Abstract: The invention provides an electrical machine having an inductor and an armature at least one of which has at least two independent winding assemblies. The switching into and out of circuit of each winding assembly is controlled by a processor which receives monitoring parameters of the machine and desired value parameters, thereby controlling in real time the operating characteristics of the machine. The machine may be a wind-driven generator.
    Type: Grant
    Filed: June 19, 1980
    Date of Patent: July 26, 1983
    Assignee: Association Gradient
    Inventors: Michel Berna, Michel Kant, Jean P. Vilain, Rene Seger
  • Patent number: 4117390
    Abstract: To provide a-c output at a voltage substantially higher than normal automotive voltage of 12-24 V, for example output voltage in the 80 to 90 V range to operate windshield and other glass pane heaters, a three-phase alternator is star-connected and has two armature windings which, for example, may be serially connected or may be separately wound, on the same stator, one winding being of comparatively few turns of heavy wire and connected to a rectifier to provide normal d-c on-board voltage for the vehicle, stored in a battery, the voltage being controlled by a voltage regulator connected to the d-c output terminals; the other winding, for example of a much larger number of turns of finer wire providing the high-voltage output at terminals adapted for connection to the heater wires in the windshield, or rear windows, or other window panes.
    Type: Grant
    Filed: July 28, 1976
    Date of Patent: September 26, 1978
    Assignee: Robert Bosch GmbH
    Inventors: Yoriaki Iwata, Suguru Sato
  • Patent number: 4100444
    Abstract: A motor is disclosed that is particularly adapted for energization from a single phase power source and that includes a magnetic core having uniformly sized and spaced slots as well as three different winding phases. In one illustrated form, the motor winding circuit includes sub-circuits in the form of a primary phase winding, an intermediate phase winding, and a capacitor phase winding with the different winding phases positioned on the core so that the space angle between the effective centers of poles (or coil groups) of next adjacently located winding phases is sixty electrical degrees. Also disclosed are procedures by which an initial ratio of effective conductors (or turns) in the capacitor phase to effective conductors in the main phase can be calculated as well as an initial ratio of effective conductors in the intermediate phase to those in the primary phase.
    Type: Grant
    Filed: September 29, 1975
    Date of Patent: July 11, 1978
    Assignee: General Electric Company
    Inventor: John H. Boyd, Jr.