Shifting Field (e.g., Shading Pole) Patents (Class 310/172)
  • Patent number: 11018561
    Abstract: Various embodiments associated with a segmented magnetic core are described. The segmented magnetic core can be made up of multiple singular structures so as to allow an individual singular structure to be removed with ease and without disturbing another magnetic core. This modular core design allows for a significant reduction in motor housing weight due to compatibility of the design with lightweight materials and the potential absence of extensive housing when so designed. This modular core design can be incorporated into a motor or a generator and this modular core design can be accomplished, in one example, by way of stacking and/or interlocking employing low cost assembly. In one example, a motor or a generator uses sensors to detect an operational failure in a magnetic core, notifying a user early of the failure.
    Type: Grant
    Filed: June 15, 2020
    Date of Patent: May 25, 2021
    Assignee: The Government of the United States, as represented by the Secretary of the Army
    Inventor: Edward Dawidowicz
  • Patent number: 10498181
    Abstract: A motor and methods for making and using same. The motor includes a stator having a first stator portion with first and second arcuate regions. The arcuate regions can receive a rotor with a magnetic pole and being concentrically arranged with the stator relative to a central axis. The stator can have one or more winding portions for being wound with a winding and extending from the first stator portion opposite the arcuate regions. When the winding is not energized, a first magnetic coupling between the first arcuate region and a selected magnetic pole is greater than a second magnetic coupling between the second arcuate region and the selected magnetic pole. A selected winding portion is angularly offset from the first arcuate region to advantageously enable movement of the rotor to initiate in either of two opposite directions relative to the selected winding portion when the winding is energized.
    Type: Grant
    Filed: July 1, 2016
    Date of Patent: December 3, 2019
    Assignee: Johnson Electric International AG
    Inventors: Yue Li, Baoting Liu, Chuiyou Zhou, Yong Wang, Ming Chen, Xiaoning Zhu
  • Patent number: 10439457
    Abstract: A magnetic induction deflector apparatus and method consisting of a metal wedge, where the metal wedge has a first side and a second side and the first side is connected with the second side at an angle such that the first side is angled away from the second side so as to form a metal wedge with a specific angle. A pair of solid wires are connected to the metal wedge where one wire is attached to the first side and another wire is attached to the second side. A second metal is connected to one side of the metal wedge and a device for connecting the second metal to the metal wedge is provided.
    Type: Grant
    Filed: May 19, 2017
    Date of Patent: October 8, 2019
    Inventors: Roy Lee Garrison, Charles Paul McNemar
  • Patent number: 10411531
    Abstract: A stator assembly having a housing and a stator that are concentric, the stator being mounted radially inside the housing is provided. This stator assembly includes fastening elements that are mounted between a radial inner surface of the housing and a radial outer surface of the stator and exert a radial fastening force on the housing and the stator.
    Type: Grant
    Filed: March 22, 2016
    Date of Patent: September 10, 2019
    Assignee: SKF Magnetic Mechatronics
    Inventors: Eduardo Carrasco, Eddy Herisse
  • Patent number: 10404147
    Abstract: A stator includes a stator core including stator poles and a yoke connecting the stator poles, at least one winding wound around the stator core and connecting terminals configured to connect with an external power source to supply power to the winding and located at one end of the yoke adjacent the stator poles. A single phase motor and a ventilation fan are also provided.
    Type: Grant
    Filed: March 28, 2017
    Date of Patent: September 3, 2019
    Assignee: JOHNSON ELECTRIC INTERNATIONAL AG
    Inventors: Min Li, Kok Ang Chong, Xiao Lin Zhang, Hai Yang Wang, Moola Mallikarjuna Reddy, Yue Li, Chui You Zhou, Hong Liang Yi, Yong Gang Zhang, Yong Wang
  • Patent number: 10215180
    Abstract: An electric fan includes a plurality of blades and an electric motor for rotating the blades. The electric motor includes a stator and a rotor rotatable relative to the stator about an axis. The rotor includes a backing ring and a diecast rotor can. The can includes a non-machined sidewall that is diecast integrally as part of the rotor can. The sidewall extends about the axis. The rotor can is diecast in an overlying relationship with at least part of the backing ring, with the sidewall and backing ring being securely interengaged so as to restrict relative shifting therebetween.
    Type: Grant
    Filed: June 30, 2015
    Date of Patent: February 26, 2019
    Assignee: Nidec Motor Corporation
    Inventors: Matthew D. Allen, Michael W. Major
  • Patent number: 9912214
    Abstract: A machine includes a rotor and a stator that is situated adjacent the rotor. The stator includes a plurality of wire-wound phases. The phases include at least first and second wire-wound phases that differ in temperature-responsive electrical resistance. A controller is in electrical communication with the stator. The controller is configured to identify an over-temperature condition of the stator based upon the differing temperature-responsive electrical resistance and modify the operation of the stator in response to the over-temperature condition.
    Type: Grant
    Filed: January 26, 2016
    Date of Patent: March 6, 2018
    Assignee: HAMILTON SUNDSTRAND CORPORATION
    Inventors: Joseph Kenneth Coldwate, Andreas C. Koenig
  • Patent number: 9831727
    Abstract: In one embodiment, an electric machine is provided. The electric machine includes a machine housing and a stator disposed at least partially within the housing, the stator comprising a plurality of teeth and an aluminum winding wound around at least one tooth of the plurality of teeth. The electric machine further includes a radially embedded permanent magnet rotor disposed at least partially within the housing, the rotor comprising at least one radially embedded permanent magnet and configured to provide increased flux to reduce motor efficiency loss compared to a copper winding.
    Type: Grant
    Filed: October 15, 2012
    Date of Patent: November 28, 2017
    Assignee: Regal Beloit America, Inc.
    Inventor: Subhash Marutirao Brahmavar
  • Patent number: 9742252
    Abstract: An electricity generator using a six-segment rotating flux switch, a 2×2 switching sequence with four magnetic flux switch sites, and a unique magnetic circuit design, all of which together alternate the magnetic flux from a stationary permanent magnet through a stationary magnetic segment around which is wound a pickup coil thereby inducing electricity in the pickup coil. Both the vector direction and the scalar value of the magnetic flux are alternated within the stationary magnetic segment resulting in a high power output of AC electricity.
    Type: Grant
    Filed: June 17, 2014
    Date of Patent: August 22, 2017
    Assignee: Transducing Energy Devices, LLC
    Inventor: Theodore C. Annis
  • Patent number: 9587638
    Abstract: A drive unit (3) for a submersible oil pump, including a housing (7), a motor compartment (9) that is surrounded by the housing (7), and a rotor (13) arranged in the motor compartment (9), whereby a first fluid path (35) leading from a submerged oil environment (37) of the housing (7) to the motor compartment (9) is provided so as to allow oil to flow from the submerged oil environment (37) into the motor compartment (9).
    Type: Grant
    Filed: March 13, 2012
    Date of Patent: March 7, 2017
    Assignee: Magna Powertrain Bad Homburg GmbH
    Inventors: Elmar Hoppach, Kai Lunau, Andreas Bernert
  • Patent number: 9484774
    Abstract: A single-phase brushless motor has both superior start-up stability and low cogging torque. In the outer-rotor-type single-phase brushless motor, when a gap width between the rotor and one edge of the salient pole surface is defined as d1, a gap width between the rotor and the other edge of the salient pole surface is defined as d2, and a minimum gap width between the rotor and the salient pole surface is defined as d3, the formula d3<d1<d2 is satisfied, and the gap width is d3 at a position shifted toward the one edge of the salient pole surface from the center of the arc shape which forms the salient pole surface.
    Type: Grant
    Filed: April 26, 2013
    Date of Patent: November 1, 2016
    Assignee: MINEBEA CO., LTD.
    Inventors: Yuji Omura, Tomoaki Nakano, Masaaki Nishizawa, Takahiro Sakaguchi, Shinichi Uchikawa, Tomoyuki Tsukada
  • Patent number: 8896178
    Abstract: A synchronous motor drive system improves the design flexibility regarding torque characteristics as compared with conventionally available design flexibility. A synchronous motor has a rotor and a stator. Each of at least two adjacent stator teeth has a slit formed at the tip thereof. Each of a plurality of stator teeth has a main coil wound therearound in concentrated winding. Between each two adjacent teeth having a slit, a sub-coil is wound around in a manner of being accommodated in the respective slits. The drive device separately controls electric current supplied to the main coils and electric current supplied to the sub-coil.
    Type: Grant
    Filed: February 15, 2011
    Date of Patent: November 25, 2014
    Assignee: Panasonic Corporation
    Inventors: Noriyoshi Nishiyama, Makoto Kitabatake
  • Patent number: 8525382
    Abstract: A motor has a stator having a stator core and field windings. The brush gear includes a plurality of brushes, a rotor including a shaft, a rotor core fixed to the shaft, a commutator fixed to the shaft adjacent the rotor core and rotor windings wound about teeth of the rotor core and connected to the commutator. The stator core has a yoke, 2P primary poles about which the field windings are wound, and 2P auxiliary poles. A control device controls the electrical connection of the field windings and the brushes so that 2P or 4P magnetic poles are selectively formed on the stator core when the field windings are electrified. P is an integer equal to or greater than 1.
    Type: Grant
    Filed: May 20, 2010
    Date of Patent: September 3, 2013
    Assignee: Johnson Electric S.A.
    Inventors: Yue Li, Bao Ting Liu, Ji Dong Chai
  • Patent number: 8519589
    Abstract: A stator core is formed of a main core including a first segment core, second segment core, and plate body, and a third segment core (I-shaped core). A rotor is disposed in a rotor insertion hole of the stator core, and an output shaft of the rotor is supported by a bearing unit. A resin molded body covers a winding of an exciting section of the motor, a circuit wiring board, and a part of a power supply connecting body. The resin molded body also covers a part of the third segment core (I-shaped core). A rotary vane or the like is mounted near the tip of the output shaft, and a blower or the like is formed.
    Type: Grant
    Filed: March 3, 2011
    Date of Patent: August 27, 2013
    Assignee: Panasonic Corporation
    Inventors: Hiroshi Sasaki, Toshifumi Tsutsumi
  • Patent number: 7669311
    Abstract: A method of manufacturing a core for an electrical machine. The method includes providing a planar sheet of magnetic material and creating first and second generally U-shaped laminations from the planar sheet. The first and second generally U-shaped laminations result from a pattern formed in the planar sheet. The pattern includes the first generally U-shaped lamination having a first leg and a second leg, and the second generally U-shaped lamination rotated one hundred-eighty degrees with respect to the first generally U-shaped lamination. The second generally U-shaped lamination includes a third leg and a fourth leg. The third leg is disposed between the first and second legs. The method further includes creating the core by stacking the first and second generally U-shaped laminations.
    Type: Grant
    Filed: June 13, 2005
    Date of Patent: March 2, 2010
    Assignee: A. O. Smith Corporation
    Inventors: Dan M. Ionel, Brian Branecky, Alan E. Lesak
  • Patent number: 7528516
    Abstract: In a rotary electrical machine, the stator is subject to eddy currents, causing losses. These losses are reduced by extending the path of the eddy currents whilst avoiding causing saturation. The invention therefore proposes to form recessed zones or slots (2) in the teeth (1) of the stator whose depth does not exceed one-half of the height of the tooth (1).
    Type: Grant
    Filed: May 26, 2006
    Date of Patent: May 5, 2009
    Assignee: Valeo Equipments Electriques Moteur
    Inventors: Jean-Claude Mipo, Lilya Bouarroudj, Albert Foggia
  • Publication number: 20080303369
    Abstract: An electric machine has a rotor and includes a first portion that is substantially rectangular and includes a rotor aperture configured to receive a portion of the rotor. A second portion is separate from and connected to the first portion. The second portion is substantially U-shaped and includes a first leg, a second leg, and a base. A first coil surrounds a portion of the first leg and a second coil surrounds a portion of the second leg.
    Type: Application
    Filed: June 9, 2008
    Publication date: December 11, 2008
    Applicant: A. O. SMITH CORPORATION
    Inventors: Dan M. Ionel, Alan E. Lesak
  • Patent number: 7420308
    Abstract: A two-phase switched reluctance motor in an embodiment includes a plurality of salient rotor poles that each have asymmetric reluctances about a central radial axis of the respective rotor pole. Each of the rotor poles has the same width, and the rotor poles are operable to provide preferential torque generation in one direction of rotation for all rotor positions. Such preferential torque generation occurs under the influence of an electromagnetic flux, which is provided by a plurality of salient stator poles having substantially the same width as the rotor poles.
    Type: Grant
    Filed: November 24, 2004
    Date of Patent: September 2, 2008
    Assignee: Virginia Tech Intellectual Properties, Inc.
    Inventors: Krishnan Ramu, Amanda Martin Staley
  • Publication number: 20080079335
    Abstract: A brushless DC motor operated by a microcontroller has a unique pole construction that enables it to reliably start and operate as a unipolar device so that a reduced number of electronic power switches can be used to reduce cost and complexity. The microcontroller calculated rotor position to eliminate the need for a separate sensor and thereby further reduce manufacturing cost.
    Type: Application
    Filed: September 29, 2006
    Publication date: April 3, 2008
    Inventors: Lester B. Ashe, Scott B. Wolf
  • Patent number: 7248008
    Abstract: Am improved shaded pole A.C. motor with dynamic brake that includes a secondary high resistance winding that is selectively connected to a D.C. source when the A.C. voltage is removed. To stop a motor the A.C. voltage applied to the motor is removed with tandem switches that apply the D.C. voltage immediately upon removal of the A.C. voltage or the D.C. voltage can be selectively applied subsequently. The brake winding produces a magnetic flux in the same core where the main stator winding produces the magnetic flux responsible for causing the rotor to move. The brake winding can be connected in parallel during the time the A.C. voltage is applied to increase of the combined windings' inductance (resulting in an overall higher torque) and/or in series when during the braking operation when the D.C. voltage is applied to increase the combined winding's resistance (limiting further the peak D.C. current or reducing the secondary winding size).
    Type: Grant
    Filed: October 17, 2005
    Date of Patent: July 24, 2007
    Inventor: Michael D. Cummins
  • Patent number: 6864612
    Abstract: An iron core for an electric motor or an electric generator includes a core section, and at least two magnetic pole pieces formed at the core section. Each magnetic pole piece has at least two slits with difference depths extending from a surface thereof to be asymmetric with respect to a center line thereof so as to divide the magnetic pole surface.
    Type: Grant
    Filed: March 9, 2004
    Date of Patent: March 8, 2005
    Inventor: Kazuhiko Gotoh
  • Patent number: 6859993
    Abstract: A permanent split capacitor electric motor is constructed by using existing components of a known shaded pole motor design to reduce engineering, tooling, inventory and other manufacturing costs of the new motor and, potentially, the known design through economics of scale. The alterations to the known motor principally involve different winding circuits and the addition of a capacitor. The new motor can be reversed with a single switch circuit.
    Type: Grant
    Filed: January 15, 2003
    Date of Patent: March 1, 2005
    Assignee: Electric Motors and Specialties, Inc.
    Inventor: Robert G. Nutter
  • Patent number: 6777844
    Abstract: A vacuum cleaner assembly includes a motor having a rotor and a stator for providing motive power to the assembly. The rotor and stator each include armatures having tips. In one aspect, the widths of the rotor and stator tips are different. In another aspect, the rotor armatures have a non-constant width. Another aspect discloses the motor being a two-phase brushless motor having an even number (N) of stator armatures and N+2 rotor armatures. In another aspect, a rotor armature includes an aperture. In another aspect, each rotor armature includes a plurality of layers laminated together, with one layer being dimensionally different than the other layers. In another embodiment of the present invention, a control circuit energizes the windings of the stator so as to toggle the rotor in a first direction before alternately energizing the windings to drive the rotor in a second direction.
    Type: Grant
    Filed: October 24, 2001
    Date of Patent: August 17, 2004
    Assignee: Rexair, Inc.
    Inventors: Steven Selewski, Mark Howie, George H. Holling
  • Publication number: 20040135456
    Abstract: A permanent split capacitor electric motor is constructed by using existing components of a known shaded pole motor design to reduce engineering, tooling, inventory and other manufacturing costs of the new motor and, potentially, the known design through economics of scale. The alterations to the known motor principally involve different winding circuits and the addition of a capacitor. The new motor can be reversed with a single switch circuit.
    Type: Application
    Filed: January 15, 2003
    Publication date: July 15, 2004
    Inventor: Robert G. Nutter
  • Patent number: 6097129
    Abstract: An electronically commutated external rotor motor has an external rotor having a cup-shaped housing and a radially magnetized permanent magnet connected in the cup-shaped housing. An interior stator is positioned in the cup-shaped housing. The interior stator has a laminated core having grooves. Windings are provided within the grooves. The windings have first end turns proximal to a bottom of the cup-shaped housing and second end turns positioned distal to the bottom. The first and second end turns electrically connect the windings to one another. The permanent magnet has an end face remote from the bottom of the cup-shaped housing. At least one galvano-magnetic rotor position sensor is arranged opposite the end face of the permanent magnet so as to be located within a magnetic leakage of the permanent magnet and within a magnetic leakage of the interior stator. The at least one rotor position sensor is designed to control current within at least a portion of the windings.
    Type: Grant
    Filed: March 19, 1999
    Date of Patent: August 1, 2000
    Assignee: Papst-Motoren GmbH & Co. KG
    Inventors: Patrick Furtwangler, Hermann Rappenecker, Harald Reich, Gabor Szondi
  • Patent number: 6087751
    Abstract: A reluctance type rotating machine includes a stator having armature windings arranged on an inner periphery of the stator, a rotor having projection portion forming magnetic poles, and a plurality of permanent magnets arranged on both side faces of the projection portions. Owing to the provision of the permanent magnets, it is possible to restrain magnetic fluxes of the armature windings of the stator from leaking toward interpole portions between the magnetic poles. The power output of the machine can be improved by increased effective fluxes.
    Type: Grant
    Filed: June 15, 1998
    Date of Patent: July 11, 2000
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Kazuto Sakai
  • Patent number: 6023118
    Abstract: A stator of an electric motor with four poles which are all parallel to each other and arranged in mutually opposite pairs around the rotor cavity. Each pole has a pole shoe which is inclined toward the inside of the stator so as to form, in practice, the rotor cavity. The mutually closer ends of the four pole shoes are mutually rigidly coupled by two thin bridges which are parallel to the axes of the poles and by two similar thin bridges arranged transversely to the axes of the poles. The poles of each pairs of parallel poles are also mutually rigidly coupled by transverse cores which can be inserted in them and removed from them, so as to allow the insertion of the bobbins of the winding coils on the cores before the cores are fitted on the respective poles.
    Type: Grant
    Filed: September 2, 1998
    Date of Patent: February 8, 2000
    Assignee: European Electric Motors Design and Engineering Anstalt
    Inventor: Giorgio Gutris
  • Patent number: 5825106
    Abstract: An electromecanic transducer comprises a stator 4 formed of three parts 6, 8 and 18 each presenting merlons or teeth 52, 54 and 60 superposed to a multipolar magnet 34 of rotor 30. Three statoric magnetic poles 10, 12 and 20 are situated in a same statoric plane and define, together with two branches 22 and 24 each containing a coil 26 and 28, two principal magnetic circuits of the transducer. The transducer is particularly suitable for a step functioning, in particular when a relatively high number of steps per turn is desired.
    Type: Grant
    Filed: February 13, 1997
    Date of Patent: October 20, 1998
    Assignee: Eta SA Fabriques d'Ebauches
    Inventor: Daho Taghezout
  • Patent number: 5780951
    Abstract: A bobbin-wound stator for small single-phase AC motors that surmounts magnetic compromises required by previous implementations is fabricated of stacked two-piece laminations and a split winding bobbin fitted about a first one of the lamination piece stacks that permits bobbin winding of a single coil about the pole neck of a magnetic yoke having pole shoes magnetically coupled to each other, but not in direct contact with each other, at a predetermined clearance distance chosen to balance rotor-to-armature flux linkage, armature inductance, and reluctance torque. The second lamination piece stack is pressed into the first lamination piece stack supporting the bobbin-wound coil to complete the stator. The stator is usable in several single-phase AC motors, including electronically commutated motors, chaotically-starting permanent magnet motors, and shaded-pole induction motors.
    Type: Grant
    Filed: December 23, 1996
    Date of Patent: July 14, 1998
    Assignee: General Electric Company
    Inventor: Charles Michael Stephens
  • Patent number: 5729071
    Abstract: Low cost multi-pole motor constructions and related methods of manufacture are disclosed. The economic advantages inherent in the construction and manufacture of C-frame motors, including modified and improved C-frame or twin bobbin motor constructions, have been applied to a variety of different kinds of motors including two pole, four pole and six pole permanent split capacitor motors; four pole, six pole, and eight pole shaded pole motors; stepper motors; multi-pole switched reluctance motors including two pole, four pole, six pole, and other multi-pole switched reluctance motors; as well as various other types of multi-pole motors. Such modified and improved C-frame motor constructions include the mounting of electrically conductive coils on at least one pair of adjacent and spaced side legs on one or both sides of a multi-pole central portion. Related methods for manufacturing laminations used in such motors from an elongated strip of material are also disclosed.
    Type: Grant
    Filed: December 7, 1995
    Date of Patent: March 17, 1998
    Inventor: Robert E. Steiner
  • Patent number: 5638041
    Abstract: An electromagnetic assembly, for example for a relay, has a magnetic core surrounded by an electrical coil, and an armature closing the magnetic circuit of the electromagnetic assembly. The magnetic core is of the split pole type having a first pole and a second pole, the former being surrounded by a shading ring to produce a phase shift in the magnetic flux in the region of the poles when the electrical coil is energized. A step is provided in the first pole between the shading ring and the armature so that the flux density, and thus the magnetic force, between the first pole and the armature is increased.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: June 10, 1997
    Assignee: Kuhnke GmbH
    Inventors: Wilfried Beyer, Thorsten Krause
  • Patent number: 5627424
    Abstract: A double twin bobbin four pole motor is disclosed. The motor includes a first and second stack of magnetically conductive stacked laminations. The first stack includes a four pole central portion with a rotor opening and two pairs of spaced side legs, each spaced pair of side legs extending from opposite sides of the central portion generally in mirror image relationship with one another and terminating in an outer free extremity. Each of the stacked side legs of the stacked spaced pair of side legs have a combined predetermined outer cross sectional configuration. The second stack of laminations includes a pair of separate magnetically conductive stacked laminations for attachment to the outer free extremities of each pair of stacked side legs. Each of the second stack of laminations have a combined predetermined outer cross sectional configuration.
    Type: Grant
    Filed: January 31, 1995
    Date of Patent: May 6, 1997
    Inventor: Robert E. Steiner
  • Patent number: 5619086
    Abstract: A C-frame motor having cooperating first and second stack of laminations is disclosed. The first stack of laminations includes an end leg with a spaced pair of side legs which are attached at one end to the end leg and terminate in an opposite end in an outer free extremity. A rotor opening is provided in the end leg of each first stack of laminations. When stacked, the rotor openings of adjacent stacked end legs provide an aligned rotor opening for receiving a rotor. Each of the stacked side legs have a combined predetermined outer cross sectional configuration coil winding area that provides a coil winding area for receiving an electrically conductive coil on each of the stacked side legs. The second stack of laminations is attached to the outer free extremity of the spaced pair of stacked side legs in the first stack of laminations in order to provide a combined magnetic inductor circuit.
    Type: Grant
    Filed: January 31, 1995
    Date of Patent: April 8, 1997
    Inventor: Robert E. Steiner
  • Patent number: 5168201
    Abstract: A shifting-field type permanent-magnet motor includes a stator having a stator core, a shading coil and a multiple-layer coil assembly; a control unit for starting the motor and a control unit for free-running the motor for sequentially changing over the multiple-layer coils; and operating-mode changeover means for changing over from a starting operation to a free-running operation. The stator core has a generally donut-shaped main body, a plurality of protruding magnetic poles formed radially on both surfaces of the main body at a pitch of 45.degree., and radially drilled holes having a predetermined width in the circumferential direction. The shading coil has an inner ring arranged on an inner peripheral surface of the main body, an outer ring arranged on an outer peripheral surface of the main body, and connecting wires for connecting the inner ring and outer ring so as to interlink the protruding magnetic poles.
    Type: Grant
    Filed: September 18, 1991
    Date of Patent: December 1, 1992
    Inventor: Takasi Nomura
  • Patent number: 5130591
    Abstract: A shaded pole motor includes a squirrel-cage rotor and a stator assembly. The stator assembly having a bore for rotatably receiving the rotor and pole separation parts on an inner circumference of the bore so that adjacent separated portions are excited alternately to an N-pole and an S-pole when a winding is energized. The inner circumference of the bore is divided into plural sections represented by 2(2n+1). The magnetically divided two pole portions have pole sections having an alternating N-pole and S-pole, and non-pole sections, when a winding of the stator is energized.
    Type: Grant
    Filed: November 29, 1989
    Date of Patent: July 14, 1992
    Assignee: Sanyo Electric Co., Ltd.
    Inventor: Hironobu Sato
  • Patent number: 5043612
    Abstract: A shading band for use in creating a shading pole in a shaded pole motor has tapered edges along its length, instead of the square cross-sectional edges with 90.degree. inside angles of the prior art, in order to increase the thickness of epoxy deposited thereon which insulates the winding slot within which the shading band extends. The shading band may be formed with a cross-sectional shape of many different geometries, as long as its cross-sectional shape does not include inside angles less than 90.degree.. The edge height for each shading band should be controlled in order to maintain an effective angle of transition from the wire slot sidewall tot he shading band of greater than about 90.degree..
    Type: Grant
    Filed: April 23, 1990
    Date of Patent: August 27, 1991
    Assignee: Fasco Industries, Inc.
    Inventor: Bryan L. Lakin
  • Patent number: 5036237
    Abstract: A shaded pole electric motor has a stator and a rotor interacting through an air gap. This stator has a salient pole with a narrow neck and wide pole shoe. A shading coil slot extends into the salient pole from the air gap and defines a shaded portion of the pole. The exposed side of the shaded portion is relatively smooth, as established by the shading coil having one side in the shading coil slot and another side in a shading pole aperture close to but spaced from the exposed side. This establishes ease of insulating the surface of the salient pole to receive a stator winding. The foregoing abstract is merely a resume of one general application, is not a complete discussion of all principles of operation or applications, and is not to be construed as a limitation on the scope of the claimed subject matter.
    Type: Grant
    Filed: April 9, 1990
    Date of Patent: July 30, 1991
    Assignee: Electric Motors and Specialties, Inc.
    Inventor: Sol London
  • Patent number: 4942323
    Abstract: A two pole electric motor is described which includes at least one stator encircling winding which at least partially overlaps the rotor air gap to insure that substantially the entire magnetic field created by such rotor encircling winding is forced to pass through the rotor with minimal leakage or fringe magnetic field bypassing the rotor.
    Type: Grant
    Filed: July 28, 1986
    Date of Patent: July 17, 1990
    Inventor: Dominic DeCesare
  • Patent number: 4893041
    Abstract: An improved stator end wire insulation assembly for a stator core wherein molded end cap insulator structure for such stator core includes means to restrain stator core opening free-ended insulation liners from both axial and radial movement, the end cap further including means to receive the protruding tips of shading elements of the stator core, insulating the shading element tips from adjacent wound magnetic wire.
    Type: Grant
    Filed: October 27, 1988
    Date of Patent: January 9, 1990
    Assignee: Emerson Electric Co.
    Inventors: S. Duke Snider, L. Ranney Dohogne, Patrick K. Murphy
  • Patent number: 4886990
    Abstract: A reversible permanent split capacitor (PSC) motor and method of designing such a motor employs a parallelogram lamination silhouette and distributes the winding in the core of the motor stator assembly so that maximum flux density in the core is approximately equal in each direction of motor rotation. The motor is designed to achieve high repetition reversal rates. The reversal rate and the equal performance attained in each direction, makes the design particularly suitable for washing machine applications.
    Type: Grant
    Filed: August 2, 1988
    Date of Patent: December 12, 1989
    Assignee: Emerson Electric Co.
    Inventor: Alan R. Barker
  • Patent number: 4585984
    Abstract: An alternating current motor comprising a combination of magnetic frequency tripler and induction rotor. The alternating current motor includes a three-legged core of which two legs serve as input leg having a coil wound thereabout and thereby constitute a linear reactor and a saturated reactor. The two coils are connected in series. The residual one leg serves as output leg which generates magnetic flux having tripled frequency by applying single phase input to the input legs. A rotor is rotatably disposed in the cylindrical gap formed in the output leg. Thus, the rotor is stably rotated at a higher rotational speed equivalent to synchronized speed determined by tripled frequency relative to frequency of alternating current supplied from commercial power supply system.
    Type: Grant
    Filed: February 22, 1985
    Date of Patent: April 29, 1986
    Inventor: Kazuo Bessho
  • Patent number: 4531072
    Abstract: An improvement in the stator structure of a synchronous motor wherein flux generated by a winding produces a magnetic field in the stator structure which in turn causes a rotor to rotate. The stator structure consists of two sets of stator poles intermeshed together. Shading base associated with certain of the stator poles insures that the rotor will start to rotate in a predetermined direction. The running characteristics of the synchronous motor are improved by having one of the sets of stator poles constructed of three different widths and the other set constructed of two different widths. The improved stator structure provides for equal flux distribution within the stator poles causing the motor to run smoothly.
    Type: Grant
    Filed: April 1, 1983
    Date of Patent: July 23, 1985
    Assignee: Emhart Industries, Inc.
    Inventors: Robert F. Weaver, Ted G. Proctor
  • Patent number: 4496869
    Abstract: A small shaded-pole motor comprises a rotor, stator core disposed in concentric relationship with the rotor, stator coils wound on the stator core and shading coils disposed in the vicinity of the stator core. The stator core consists of two generally rectangular plates each having a ring-shaped projection formed by stamping and swaging. The ring-shaped projections extend in a direction perpendicular to the plane of the plates. The height of the ring-shaped projections at their inner side is equal to about a half of the thickness of said rotor in its axial direction. The two plates are assembled together back to back so that their ring-shaped projections define a cylindrical space for the rotor. The stator coils are mounted on the portions of the back to back assembled plates other than their ring-shaped projections.
    Type: Grant
    Filed: December 8, 1982
    Date of Patent: January 29, 1985
    Assignee: Tobishi Industries Ltd.
    Inventor: Toshiro Hosoya
  • Patent number: 4482832
    Abstract: A shaded pole lamination is disclosed which includes a rotor opening positioned asymmetrically with respect to the sides of the lamination so as to increase the metal available to carry the magnetic flux on the side of the main pole which is farther from the main coil. In addition, shading coil recesses are provided which are grouped with respective reluctance gaps and crowded into the region near the reluctance gaps in order to maximize the area of the main poles. The shape of the lamination adjacent the reluctance gap has been modified to further increase operating efficiency.
    Type: Grant
    Filed: March 31, 1983
    Date of Patent: November 13, 1984
    Assignee: Rival Manufacturing Company
    Inventor: Paul Minton
  • Patent number: 4418296
    Abstract: A magneto-generator for engine ignition has a cup-shaped pole-wheel with a multiplicity of magnet poles (13) within which is a stationary star-shaped armature having generator windings (20) on the outwardly extending pole legs. A pulse generator (24) is built in with its winding around a core (25) having one end affixed to the armature core (17) between two pole legs (18) and its other end terminating in a pole head (27) that cooperates with a projection (28) of the revolving pole-wheel to enable a control pulse to be generated by a flux derived from the same magnets that serve the generator windings.
    Type: Grant
    Filed: November 5, 1981
    Date of Patent: November 29, 1983
    Assignee: Robert Bosch GmbH
    Inventors: Hans Ebentheuer, Adam Hirt
  • Patent number: 4394595
    Abstract: A synchronous motor wherein a field coil is positioned adjacent to a rotor and stator assembly in a side-by-side relationship has a stator pole arrangement to compensate for flux phase differences caused by the side-by-side arrangement.
    Type: Grant
    Filed: September 8, 1980
    Date of Patent: July 19, 1983
    Assignee: Emhart Industries, Inc.
    Inventor: Robert F. Weaver
  • Patent number: 4355252
    Abstract: In a self-starting unidirectional synchronous motor which includes a stator, an exciting coil at least partly disposed within the stator, a permanent magnet type rotor which has a plurality of rotor poles and is at least partly disposed within the coil, and wherein a space is defined between the rotor and the coil, and the stator includes groups of unshaded main poles and groups of shaded auxiliary poles alternating with each other, and respective end zones are defined between adjacent groups, and each pole generates a corresponding magnetic field, the poles comprise pole arms extending into the space and include half poles disposed at least near the end zones, respectively, and wherein the groups of shaded poles are displaced with respect to the groups of non-shaded poles by respective spatial electrical angles, and the magnetic fields of groups of shaded poles are shifted with respect to groups of non-shaded poles by respective phase angles.
    Type: Grant
    Filed: May 27, 1980
    Date of Patent: October 19, 1982
    Assignee: LGZ Landis & Gyr Zug AG
    Inventors: Hubert Lechner, Benedikt Steinle
  • Patent number: 4274024
    Abstract: Herein disclosed is a self-starting synchronous motor with a defined direction of rotation, a permanent magnetic rotor and a claw-pole type stator. The stator embraces an operating winding where several poles are combined to form main pole groups and to form auxiliary pole groups which are loaded with short circuiting discs. Furthermore, the synchronous motor of this invention has a defined direction of rotation which is not preset by means of a directional blockage. The poles, which are located on a circular ring and protrude from the oppositely located front sides and which interlock, are combined to form two main pole groups and two auxiliary pole groups wherein the total number of main poles is smaller than the total number of auxiliary poles and that from each of both of the frontal sides protrude the same number of main poles and the same number of auxiliary poles.
    Type: Grant
    Filed: March 29, 1979
    Date of Patent: June 16, 1981
    Assignee: Schleicher GmbH & Co. Relais-Werke KG
    Inventor: Detlef Gottschalk
  • Patent number: RE30585
    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.
    Type: Grant
    Filed: May 17, 1978
    Date of Patent: April 21, 1981
    Assignee: General Electric Company
    Inventor: Joe T. Donahoo
  • Patent number: RE36545
    Abstract: A double twin bobbin four pole motor is disclosed. The motor includes a first and second stack of magnetically conductive stacked laminations. The first stack includes a four pole central portion with a rotor opening and two pairs of spaced side legs, each spaced pair of side legs extending from opposite sides of the central portion generally in mirror image relationship with one another and terminating in an outer free extremity. Each of the stacked side legs of the stacked spaced pair of side legs have a combined predetermined outer cross sectional configuration. The second stack of laminations includes a pair of separate magnetically conductive stacked laminations for attachment to the outer free extremities of each pair of stacked side legs. Each of the second stack of laminations have a combined predetermined outer cross sectional configuration.
    Type: Grant
    Filed: May 6, 1998
    Date of Patent: February 1, 2000
    Inventor: Robert E. Steiner