D.c. Patents (Class 310/177)
  • Patent number: 10069356
    Abstract: The present invention provides a hollow rotor structure for a direct-current motor and a winding structure of the same are provided for use in a direct-current motor. The hollow rotor structure includes a commutator, can output element, and a hollow rotor. The hollow rotor includes an iron core wound with a plurality of windings and is formed with an axial hole extending along the axial direction of the hollow rotor. Once mounted in a housing, the hollow rotor is spaced from a stator fixed in the housing and is separately connected to the commutator and the output element. When the commutator supplies a current to each winding, the hollow rotor generates the corresponding electromagnetic fields, which repel the magnets on the stator respectively. Thus, the hollow rotor generates a rotating force and outputs the rotating force through the output element.
    Type: Grant
    Filed: March 10, 2016
    Date of Patent: September 4, 2018
    Assignee: Xingu Motor Inc.
    Inventor: Lien-Hsin Wu
  • Patent number: 9742235
    Abstract: A rotor element or a star disk which is designed to be arranged on an electrically excited rotor of an electric machine, includes a base which is designed to be arranged in an insert between the axial end of a laminate stack of the rotor and at least one end winding of the rotor. At least one fin is fastened on the base and is designed to protrude in the insert through the at least one end winding axially out of the at least one end winding.
    Type: Grant
    Filed: August 12, 2016
    Date of Patent: August 22, 2017
    Assignee: Bayerische Motoren Werke Aktiengesellschaft
    Inventors: Andreas Huber, Jan Sousek, Endre Barti, Berthold Schinnerl, Dragoljub Duricic, Gerd Britten, Johannes Mintzlaff, Alexander Maier, Andreas Mayr
  • Patent number: 9203337
    Abstract: A method for controlling a multiphase machine which is connected to a direct current voltage source. The machine has a DC link which is provided with a DC link capacitor, phase windings, and a high side switch and a low side switch for each phase. The switches associated with the individual phases are acted on by control signals from a control unit. For reducing the DC link current, the control unit provides block-shaped control signals for the switches associated with the individual phases in such a way that trapezoidal or pulsed phase currents are predefined, at least one phase current is connected at any point in time in each control cycle, and the value of the amplitude ratio of the predefined phase currents is selected in such a way that the connected phase currents correspond to the instantaneous current of the direct current voltage source.
    Type: Grant
    Filed: June 20, 2012
    Date of Patent: December 1, 2015
    Assignee: ROBERT BOSCH GMBH
    Inventors: Fabio Magini, Paul Mehringer
  • Publication number: 20150061448
    Abstract: An armature includes a core having a plurality of teeth, which are radially formed with a rotation axis as the center, a plurality of coils where each coil is wound around each set of teeth containing at least two teeth. The plurality of coils have a plurality of inside coils placed on a rotation axis side of the teeth and a plurality of outside coils placed outside the inside coils. The plurality of inside coils are circularly arranged so that inside coils adjacent to each other are not wound around the same tooth. The plurality of outside coils are circularly arranged so that outside coils adjacent to each other are not wound around the same tooth. The outside coils are wound around a second set of combinations of teeth, which are different from a first set of combinations of teeth around which the inside coils are wound.
    Type: Application
    Filed: November 10, 2014
    Publication date: March 5, 2015
    Inventors: Hiroshi Kimura, Takashi Muramoto, Hisashi Ogino
  • Patent number: 8886374
    Abstract: The present invention provides a torque control method for an HEV, the method comprising: detecting an operation failure of an integrated starter-generator (ISG); calculating a driver demand torque based on a current accelerator position sensor (APS); controlling the hydraulic pressure and operation of a clutch so as to increase an engine speed to convert the driving mode of the vehicle from electric vehicle (EV) mode to hybrid electric vehicle (HEV) mode in the event that an operation failure of the ISG is detected and the driver demand torque is out of a predetermined range; and compensating the driver demand torque to a desired level based on a transfer torque from the clutch to a motor. The method can improve driving performance and power performance of HEV, in the event of ISG failure, by performing a hydraulic control for a clutch and calculating a driver request torque and a transfer torque from the clutch to a motor to compensate the drive request torque to a desired level.
    Type: Grant
    Filed: October 23, 2008
    Date of Patent: November 11, 2014
    Assignee: Hyundai Motor Company
    Inventor: Sang Joon Kim
  • Publication number: 20140167538
    Abstract: The present invention provides embodiments of more efficient electric motors. Disclosed herein is an embodiment of an electric motor having a stator and a rotor, each of which have at least two electromagnets. The polarization of the electromagnets may be changed in a way to reduce self-induction. The electric may include two voltage sources connected in series such that they initiate a rotation cycle of the rotor and only one of the voltage sources drives the rotor for the majority of the rotation cycle. Disclosed also is an embodiment of an electromagnet that has a coil wire structure including a plurality of coil wires, an iron structure; and paramagnetic material that separates (1) the coil wire structure from the iron structure and (2) segments of the coil wires from each other.
    Type: Application
    Filed: September 10, 2013
    Publication date: June 19, 2014
    Inventor: Keila Bentin
  • Publication number: 20140167553
    Abstract: A permanent magnet DC motor with 2P magnetic poles, where P is an integer greater than 1, comprising a stator (100) with a plurality of magnetic components, and a rotor (104) configured to rotate relative to the stator. The rotor may comprise a commutator and a rotor core with a plurality of rotor teeth (106) defining a plurality of rotor grooves (108), wherein the rotor grooves accommodate a plurality rotor windings. In some embodiments, the commutator comprises a plurality m of commutator bars (Z), wherein m is an even number greater than 2. The rotor windings comprises a plurality of coil elements (W), wherein a coil element comprises two ends connecting a pair of commutator bars, such that a first pair of adjacent commutator bars is connected through P?1 serially connected coil elements, and a second pair of adjacent commutator bars is connected through P+1 serially connected coil elements.
    Type: Application
    Filed: December 17, 2013
    Publication date: June 19, 2014
    Applicant: Johnson Electric S.A.
    Inventors: Yongbin LI, Xiaowu XIE, Jianguo GUO, Xianming WU
  • Patent number: 8698370
    Abstract: The invention relates to a method for producing the rotor winding of an electrical machine having at least four exciter poles in the stator (11) and having a commutator rotor (13) with a number of slots (N) and pole teeth (Z) which deviates from the number of exciter poles, and having a number of individual tooth coils (S) and laminations (L) which is at least twice as high as the number of pole teeth, wherein the individual tooth coils are wound, starting from the first coil (S1) onto in each case that pole tooth with the lowest angular error (Wf) in relation to a pole division (Pt).
    Type: Grant
    Filed: November 19, 2008
    Date of Patent: April 15, 2014
    Assignee: Robert Bosch GmbH
    Inventor: Gerald Roos
  • Publication number: 20140009027
    Abstract: A plurality of teeth of an armature core arranged in a circumferential direction each include an inner winding portion in its proximal region and first and second branch portions that extend radially and branch off in a bifurcated manner from a distal end of the inner winding portion in the circumferential direction. After winding the first to ninth coils around the inner winding portions of all of the teeth, the tenth to eighteenth coils are wound sequentially around outer winding portions of adjacent ones of the teeth each including the first branch portion of one of the two adjacent teeth and the second branch portion of the other one of the adjacent teeth.
    Type: Application
    Filed: June 28, 2013
    Publication date: January 9, 2014
    Inventors: Keita KAWAI, Tomohisa OKAMOTO, Takehiko OHSHITA
  • Publication number: 20130249343
    Abstract: This disclosure relates in general to a new and improved electric motor/generator, and in particular to an improved system and method for producing rotary motion from a electro-magnetic motor or generating electrical power from a rotary motion input by concentrating magnetic forces due to electromagnetism or geometric configurations.
    Type: Application
    Filed: March 20, 2013
    Publication date: September 26, 2013
    Inventor: Fred E. HUNSTABLE
  • Patent number: 8502431
    Abstract: A coil structure for a coreless motor includes a plurality of first conductive traces and a plurality of second conductive traces. The first conductive traces are disposed in succession relative to one another, and are each arranged into a planar spiral configuration having a substantially polygonal shape. At least one adjacent pair of the first conductive traces cooperate to define a space therebetween. Each of the second conductive traces is disposed in the space defined by a corresponding adjacent pair of the first conductive traces, and is arranged into a planar spiral configuration that has one of a substantially triangular shape and a substantially rhombic shape so as to substantially fill the space.
    Type: Grant
    Filed: December 7, 2010
    Date of Patent: August 6, 2013
    Assignee: Metal Industries Research and Development Centre
    Inventors: Guo-Jhih Yan, Guang-Miao Huang, Jing-Hui Wang, Cheng-Liang Yao, Hsin-Te Wang, Liang-Yi Hsu
  • Publication number: 20130193795
    Abstract: A direct-current motor includes a yoke having six magnetic poles, an iron core having nine teeth, first and second coils wound about each tooth in directions different from each other, a commutator for being rotated integrally with the iron core and having eighteen commutator pieces, and three pairs of brushes. The brush having the positive pole electrically connected to the first coil is different from the brush having the positive pole electrically connected to the second coil, the brush having the negative pole electrically connected to the first coil is different from the brush having the negative pole electrically connected to the second coil, or the brush having the positive pole and the brush having the negative pole that are electrically connected to the first coil are respectively different from the brush having the positive pole and the brush having the negative pole that are electrically connected to the second coil.
    Type: Application
    Filed: October 29, 2012
    Publication date: August 1, 2013
    Applicant: ASMO CO., LTD.
    Inventor: ASMO CO., LTD.
  • Publication number: 20120319520
    Abstract: A dc motor includes a stator having multiple field magnet poles, and an armature having an armature core, armature coils, and a commutator, and brushes brought into contact with the commutator. The armature coils include concentrated winding coil units wound on respective teeth, and connecting wire units that electrically connect each of the concentrated winding coil units together. A segment group of the commutator includes a first segment and a second segment placed adjacently to each other, to which the concentrated winding coil units are connected, the segment group also includes a third segment disposed next to the adjacent placement, and only the connecting wire unit is connected to the third segment. The connecting wire units include connecting wire units that pass through slots and connect each of the concentrated winding coil units together.
    Type: Application
    Filed: March 29, 2011
    Publication date: December 20, 2012
    Applicant: PANASONIC CORPORATION
    Inventors: Syouzou Sakon, Yasuharu Uchida, Jiro Okubo, Kazuo Toya
  • Publication number: 20120274170
    Abstract: A brush direct current motor has a stator with a plurality of coils that correspond to a number of stator windings, a rotor with a number of poles, and a commutator. The commutator is connected to a first terminal of a direct current power source to convert the power into N phase alternating current. One end of each stator winding is connected to a respective phase of the alternating current via a brush and the other ends of the stator windings are connected to the second terminal of the direct current power source.
    Type: Application
    Filed: April 27, 2012
    Publication date: November 1, 2012
    Inventors: Yue Li, Li Sheng Liu, Yong Qing Qi, Hong Jian Zhang
  • Publication number: 20120212080
    Abstract: A permanent magnet motor has a rotor and a stator. The rotor has a shaft, a rotor core and commutator fixed to the shaft, and rotor windings wound about poles of the rotor core and electrically connected to the commutator. The stator has an axially extending round housing, a ring magnet member fixed to an inner surface of the round housing, an endcap, and at least one pair of brushes in sliding contact with the commutator. A chamber is formed by the housing and the endcap. The commutator is disposed in the chamber. A window lift device incorporating the motor is also provided.
    Type: Application
    Filed: February 17, 2012
    Publication date: August 23, 2012
    Inventors: Mao Xiong Jiang, Yue Li, Jian Zhao, Hong Min Wei, Ke Lin Zhou, Xing Zhang
  • Publication number: 20120086295
    Abstract: A motor having a rotor whose outer surface conforms to a non-degenerate quadric surface, and a matching stator.
    Type: Application
    Filed: October 6, 2010
    Publication date: April 12, 2012
    Applicant: MATRIX MOTOR, LLC
    Inventor: Chong Kyu Kim
  • Patent number: 8120297
    Abstract: A synchronous motor having phase windings which are split or tapped and in which the conduction angle of the applied alternating current is varied at one or more taps to allow the motor to start in a controlled direction and be torque controlled to synchronous speed.
    Type: Grant
    Filed: September 3, 2007
    Date of Patent: February 21, 2012
    Assignee: Wellington Drive Technologies Limited
    Inventor: Jamie Jon Aorangi Wilkinson
  • Publication number: 20110298326
    Abstract: The present invention refers to a high efficiency and cold electromagnetic motor that is able to considerably increase the electromagnetic and/or mechanic potential energy available to be used in any equipment fed by primary sources of energy. More specifically, the present invention refers to a motor, or also a generator, that comprises structural and functioning features that reduce the consumption of electric energy and, at the same time, deliver mechanic potential energy and work torque at least equivalent to the conventional electric motors.
    Type: Application
    Filed: May 21, 2009
    Publication date: December 8, 2011
    Applicant: ASSOCIACAO KEPPE & PACHECO
    Inventors: Norberto da Rocha Keppe, Carlos César Soós, Roberto Heitor Frascari
  • Publication number: 20110133591
    Abstract: A coil structure for a coreless motor includes a plurality of first conductive traces and a plurality of second conductive traces. The first conductive traces are disposed in succession relative to one another, and are each arranged into a planar spiral configuration having a substantially polygonal shape. At least one adjacent pair of the first conductive traces cooperate to define a space therebetween. Each of the second conductive traces is disposed in the space defined by a corresponding adjacent pair of the first conductive traces, and is arranged into a planar spiral configuration that has one of a substantially triangular shape and a substantially rhombic shape so as to substantially fill the space.
    Type: Application
    Filed: December 7, 2010
    Publication date: June 9, 2011
    Inventors: Guo-Jhih Yan, Guang-Miao Huang, Jing-Hui Wang, Cheng-Liang Yao, Hsin-Te Wang, Liang-Yi Hsu
  • Publication number: 20110127871
    Abstract: The invention relates to a method for producing the rotor winding of an electrical machine having at least four exciter poles in the stator (11) and having a commutator rotor (13) with a number of slots (N) and pole teeth (Z) which deviates from the number of exciter poles, and having a number of individual tooth coils (S) and laminations (L) which is at least twice as high as the number of pole teeth, wherein the individual tooth coils are wound, starting from the first coil (S1) onto in each case that pole tooth with the lowest angular error (Wf) in relation to a pole division (Pt).
    Type: Application
    Filed: November 19, 2008
    Publication date: June 2, 2011
    Applicant: Robert Bosch GMBH
    Inventor: Gerald Roos
  • 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: 7772739
    Abstract: A commutator has a tabular holding portion defining a thickness direction. A plurality of segments are arranged in one end in the thickness direction of the holding portion in a radial pattern. Each of the segments has a slidable contact surface which is perpendicular to the thickness direction. A feeding brush is brought into slidable contact with the slidable contact surface. A tabular short-circuit unit short-circuits the segments to be set to the same electric potential with each other. The short-circuit unit is arranged parallel to the slidable contact surface. Accordingly, it is possible to enlarge a cross-sectional area which is perpendicular to a current passing direction of the coupling portion while suppressing an enlargement of a dimension in the axial direction of the commutator.
    Type: Grant
    Filed: December 27, 2006
    Date of Patent: August 10, 2010
    Assignee: ASMO Co., Ltd
    Inventors: Yoshiki Nakano, Masayuki Kuwano, Shinji Santo, Toshio Yamamoto
  • Publication number: 20100045128
    Abstract: The invention relates to a DC current machine, in particular a DC current motor for driving a blower of a motor vehicle, with a pole housing forming the stator of the machine, a rotor that is rotatably mounted in two bearing plates, and with a brush support for supplying current to the rotor. According to the invention, a support is integrated into the brush support, with de-tensioning for the electrical connecting cables of the machine, which means that a secure fastening, de-tensioning, and insulation of the connecting cables is achieved without additional components and without additional expense in the assembly of the machine.
    Type: Application
    Filed: February 6, 2008
    Publication date: February 25, 2010
    Inventors: Erik Maurer, Wolfgang Winkler, Markus Heidrich
  • Publication number: 20100033064
    Abstract: A power supply unit superimposes alternating-current voltage on direct-current voltage and applies it to a motor. As a result, when the motor is rotated, a current containing an alternating-current component flows. Further, the motor includes a capacitor connected in parallel with one phase coil. Owing to this capacitor, the impedance of the motor circuit between brushes is varied according to the rotation of the motor. Variation in impedance appears as variation in the amplitude of the alternating-current component in motor current. A signal processing unit extracts an alternating-current component from the motor current detected by the current detection unit and generates a rotation pulse corresponding to variation in the amplitude. A rotation angle detection unit detects the rotation angle of the motor based on this rotation pulse.
    Type: Application
    Filed: August 5, 2009
    Publication date: February 11, 2010
    Applicant: DENSO CORPORATION
    Inventors: Ken Tanaka, Tsutomu Nakamura, Kenji Takeda, Masaru Touge, Yasuhiro Fukagawa
  • Patent number: 7582998
    Abstract: The present invention is a direct current generating machine that eliminates the need for brushes or other mechanical commutators. A pair of opposed, spaced apart rotatable rotors, each carrying a plurality of bar magnets, are synchronously rotated about a common axis of rotation. A stationary electrically conducting wire extends through the axis of rotation, and radially outwardly therefrom, between the rotating magnetic field. In another embodiment the bar magnets are replaced by pieces of steel which interrupt a unidirectional, magnetic field created by a magnet. The magnet used to create the unidirectional, magnetic field may be an electromagnet. The resultant electrical signal generated in the conductor is unidirectional. The present invention may be used to create brushless DC electrical signals, brushless three-phase DC electrical signals, or a plurality of DC and/or inverted DC signals.
    Type: Grant
    Filed: July 24, 2007
    Date of Patent: September 1, 2009
    Inventor: Stephen Hummel
  • Publication number: 20090066179
    Abstract: A slide surface of each segment defines a plane orthogonal to an axial direction of a direct current motor. A power supply brush is pressed against and contacted with the slide surface. The power supply brush includes a main brush and a sub-brush. The sub- brush has electrical resistance that is higher than that of the main brush. At least the main brush supplies an armature with power. The sub-brush is arranged more inward in the radial direction of the commutator than the main brush.
    Type: Application
    Filed: April 3, 2008
    Publication date: March 12, 2009
    Applicant: ASMO Co., Ltd.
    Inventors: Yoshiki NAKANO, Kuniaki MATSUMOTO
  • Patent number: 7466044
    Abstract: An electro-magnetic circular engine in which the motive force is electro-magnetism. The electro-magnetic circular engine comprises a hub assembly, first and second electro-magnetic wheels, electro-magnetic means, and electrical means. The electro-magnetic circular engine includes the rotation of the hub assembly in a predetermined direction continuously after the initial activation of the hub assembly by assembly of applying a short period of the external force, such as from a starter. At least three alternators are connected to the rotating shaft and work at a minimum of 35 amps to over 600 amps each and recharge batteries.
    Type: Grant
    Filed: April 18, 2006
    Date of Patent: December 16, 2008
    Inventor: Shimon Elmaleh
  • Publication number: 20080272668
    Abstract: A three-phase DC motor includes a rotor having plurality of magnetic poles, and a stator. The stator has three corners. The second corner is adjacent to a first direction of the first corner. The third corner is adjacent to a second direction of the first corner. The first corner, the second corner, and the third corner extend forwards to the rotor to form a first winding slot, a second winding slot, and a third winding slot respectively. A first winding, a second winding, and a third winding respectively wind around the first winding slot, the second winding slot, and the third winding slot. The mechanical angle between the first winding slot and the second winding slot is between 75 and 85 degrees. The mechanical angle between the first winding slot and the third winding slot is also between 75 and 85 degrees.
    Type: Application
    Filed: May 2, 2007
    Publication date: November 6, 2008
    Inventors: Li-Te Kuo, Chau-Shin Jang
  • Publication number: 20080258574
    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: Application
    Filed: April 11, 2008
    Publication date: October 23, 2008
    Applicant: ASMO CO., LTD.
    Inventor: Shinji Santo
  • Publication number: 20080246360
    Abstract: A slide surface of each segment defines a plane orthogonal to an axial direction of a direct current motor. A power supply brush is pressed against and contacted with the slide surface. The power supply brush includes a main brush and a sub-brush. The sub-brush has electrical resistance that is higher than that of the main brush. At least the main brush supplies an armature with power. The sub-brush is arranged more inward in the radial direction of the commutator than the main brush.
    Type: Application
    Filed: June 24, 2008
    Publication date: October 9, 2008
    Applicant: ASMO Co., Ltd.
    Inventors: Yoshiki NAKANO, Kuniaki MATSUMOTO
  • Patent number: 7411328
    Abstract: A dynamo electric machine for an aircraft gas turbine engine includes a housing supporting a stator of the dynamo electric machine, a rotor assembly rotatably mounted in the housing and including an elongate hollow rotor shaft, a main shaft for connection at one end to the associated gas turbine engine assembly, said main shaft extending coaxially within said hollow rotor shaft, and a sleeve-like member of electrically insulating material between said rotor shaft and said main shaft, said sleeve-like member providing an electrically insulating driving connection between said main shaft and said rotor shaft whereby said main shaft and said rotor shaft rotate together.
    Type: Grant
    Filed: September 9, 2005
    Date of Patent: August 12, 2008
    Assignee: Goodrich Corporation
    Inventors: John Gregory Snelick, Thomas Edward Morgan, Adam Brian Brugmann
  • Publication number: 20080040001
    Abstract: A vehicular steering system can suppress steering of steerable road wheels in a direction not intended by a driver. A steering mechanism steers the steerable road wheels in accordance with a steering wheel and an auxiliary steering angle superposition mechanism. A calculation section calculates a target auxiliary steering angle corresponding to a steering wheel angle of the steering wheel. A detection section accurately detects the auxiliary steering angle based on detection signals of a rotation angle sensor that detects a rotation angle of a rotational member. A driving section controls the auxiliary steering angle superposition mechanism so as to make the auxiliary steering angle coincide with the target auxiliary steering angle. An auxiliary steering angle detection abnormality monitoring section detects abnormality of the auxiliary steering angle detection section.
    Type: Application
    Filed: January 29, 2007
    Publication date: February 14, 2008
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Kenji Ogawa, Takayuki Kifuku, Masayoshi Yamamoto, Masafumi Okazaki
  • Patent number: 7285889
    Abstract: The invention relates to electric motors, particularly to low-voltage gearless commutator motors, and can be used as motor-wheels in transportation vehicles and in other technologies. The aim of the present invention is to provide an electric motor with increased performance characteristics, relatively simple design, and high reliability.
    Type: Grant
    Filed: October 11, 2005
    Date of Patent: October 23, 2007
    Assignee: Ultra Motor Company Limited
    Inventor: Vasily Vasilievich Shkondin
  • Patent number: 6975054
    Abstract: An electric motor includes a stator which carries permanent magnets, and a rotor which carries electromagnets. A particular arrangement of connecting up the windings of the electromagnets to the distributing collector and the selection of the ratio of stator magnets to rotor electromagnets enable higher torque to be achieved. The main field of application is in motor-wheels of vehicles.
    Type: Grant
    Filed: April 14, 2004
    Date of Patent: December 13, 2005
    Assignee: Ultra Motor Company Limited
    Inventor: Vasily Vasilievich Shkondin
  • Patent number: 6888280
    Abstract: The system includes a permanent magnet three-phase motor and an electronic current controlled inverter by pulse width modulation. The motor has twenty-two poles and twenty-four slots, three phases and a cylindrical outer rotor. This structure minimizes torque ripple and maximizes energy efficiently. All coil windings are wound around the stator teeth. A winding configuration is proposed. The motor phases are supplied by alternating rectangular current waveforms. A specific inverter control system is described to maximize efficiency and reduce current ripple and electromagnetic interference under motorizing or generating operations. The current control is realized by using the MOSFETs voltage for the current measurement.
    Type: Grant
    Filed: August 26, 2003
    Date of Patent: May 3, 2005
    Inventors: Jean-Yves Dubé, Jérôme Cros, Philippe Viarouge
  • Patent number: 6876122
    Abstract: The present invention is directed to an electric motor for rotating an object around a central axis. The electric motor includes a motor casing. A circular segmented rail element is disposed within the motor casing about the central axis. The circular segmented rail element includes metallic non-ferrous segments interleaved with non-metallic segments. Each of the metallic non-ferrous segments has a predetermined segment length. At least one coil element is connected to the motor casing. The circular segmented rail element is disposed adjacent the at least one coil element. The at least one coil element has a predetermined coil length that is less than or equal to the predetermined segment length. The at least one coil element is configured to apply electromagnetic energy to the circular segmented rail element, such that the circular segmented rail element rotates around the central axis.
    Type: Grant
    Filed: September 16, 2002
    Date of Patent: April 5, 2005
    Assignee: Lockheed Martin Corporation
    Inventor: Brad C. Hansen
  • Publication number: 20040104637
    Abstract: The system includes a permanent magnet three-phase motor and an electronic current controlled inverter by pulse width modulation. The motor has twenty-two poles and twenty-four slots, three phases and a cylindrical outer rotor. This structure minimizes torque ripple and maximizes energy efficiently. All coil windings are wound around the stator teeth. A winding configuration is proposed. The motor phases are supplied by alternating rectangular current waveforms. A specific inverter control system is described to maximize efficiency and reduce current ripple and electromagnetic interference under motorizing or generating operations. The current control is realized by using the MOSFETs voltage for the current measurement.
    Type: Application
    Filed: August 26, 2003
    Publication date: June 3, 2004
    Applicant: Jean-Yves Dube
    Inventors: Jean-Yves Dube, Jerome Cros, Philippe Viarouge
  • Publication number: 20040061399
    Abstract: A small motor in a casing has a motor shaft, which has a worm outside the casing. A worm wheel is rotatably mounted to a housing for a reduction mechanism and meshes with the worm. The motor shaft is supported by radial bearings in the housing, and is supported at the bottom by a thrust bearing thereby simplifying the structure. Furthermore, a rotary disc is fixed to the motor shaft to rotate together with the motor shaft. An angle of rotation of the motor shaft is detected by a rotation detector via the rotary disc and converted to a digital signal by an electronic circuit.
    Type: Application
    Filed: July 16, 2003
    Publication date: April 1, 2004
    Inventors: Naoto Seshita, Yoshinori Yamauchi
  • Patent number: 6703745
    Abstract: A rotor structure for a motor having built-in type permanent magnets includes a multiplicity of axial slots for containing the permanent magnet, and a shaft hole for installing a shaft. The invention essentially forms a petal-shaped convex polar portion having an exterior circular arc on the outer side of the rotor adjacent each axial magnet slot, where the radius of the circular arc is smaller than the radius of the rotor. The petal-shaped convex polar portions provide an approximately sinusoidal distribution of air-gap magnetic flux that can improve the cogging torque of the motor, weaken the armature reaction of the motor, and prevent the permanent magnets from being demagnetized. In addition, an axial empty slot is also provided between the shaft hole and the corners where the adjacent magnet slots approach such that the magnetic flux leakage can be prevented and the weight of the rotor can be reduced too.
    Type: Grant
    Filed: June 3, 2002
    Date of Patent: March 9, 2004
    Assignee: Adlee Powertronic Co, Ltd.
    Inventor: Ming Tsung Chu
  • Publication number: 20040041487
    Abstract: A pole ring particularly suitable for d.c. motors comprises several retaining projections (34,36) provided at the outer circumference (32) for the secure retainment in a motor housing (10). The retaining projections (34,36) comprise retaining surfaces (40) pointing oppositely to the mounting direction (38). Fixing is effected via the retaining surfaces (40) in a housing (10) made of a soft material, such as aluminum diecasting or plastic, for example.
    Type: Application
    Filed: August 26, 2003
    Publication date: March 4, 2004
    Applicant: Pierburg GmbH
    Inventors: Ismail Onder, Isao Fukumoto
  • Patent number: 6665102
    Abstract: A DC motor of a galvanometer-type scanner has four poles, and compared to a conventional DC motor with a bipolar construction, the armature inductance L can be reduced to half or less for a case where the external diameter of the rotor and the induced voltage constant KE are the same. Since KE/L, which is the index for the rise of torque of the motor, is increased by a factor of two or more, the responsiveness of the motor can be improved without increasing the exciting current of the winding. Accordingly, it is possible to provide a galvanometer-type scanner that can set minute angles of around one degree within several hundred microseconds.
    Type: Grant
    Filed: September 25, 2002
    Date of Patent: December 16, 2003
    Assignee: Harmonic Drive Systems Inc.
    Inventors: Toshiki Maruyama, Nozomu Tanioka, Kunio Miyashita, Akira Akahane
  • Patent number: 6630764
    Abstract: The system includes a permanent magnet three-phase motor and an electronic current controlled inverter by pulse width modulation. The motor has twenty-two poles and twenty-four slots, three phases and a cylindrical outer rotor. This structure minimizes torque ripple and maximizes energy efficiently. All coil windings are wound around the stator teeth. Several winding configurations are proposed and a special one with only one coil per slot. The motor phases are supplied by alternating rectangular current waveforms. A specific inverter control system is described to maximize efficiency and reduce current ripple and electromagnetic interference under motorizing or generating operations. The current control is realized by using the mosfets voltage for the current measurement.
    Type: Grant
    Filed: February 1, 2002
    Date of Patent: October 7, 2003
    Inventors: Jean-Yves Dubé, Jérôme Cros, Philippe Viarouge
  • Publication number: 20030127930
    Abstract: A generator comprising a generator housing and a generator drive shaft including a power input shaft coupled to a drive member through a coupling arrangement, whereby in use the drive member is coupled to an output shaft of an associated engine. The coupling arrangement is arranged within the generator housing and comprises first and second coupling members and an insulator member interposed between the first and second coupling members. The coupling arrangement is configured such that the input shaft is electrically insulated from the drive member and, hence, from the engine output shaft, in use.
    Type: Application
    Filed: August 23, 2002
    Publication date: July 10, 2003
    Inventors: Bryan J. Mackulin, Todd A. Travers, John R. Karabinus
  • Publication number: 20020030415
    Abstract: Printed circuit board 6, stator core 8, AC power source connector 14, step-down circuit 15, rectifier circuit 16, and control circuit 18 are molded into one piece using molding material 20 to form a stator. Rotor 9 is placed in stator core 8. DC high voltage from rectifier circuit 16 is supplied directly to stator coils 7 as a driving power source and DC low voltage from the step-down circuit is supplied to the control circuit as a control power source.
    Type: Application
    Filed: June 22, 2001
    Publication date: March 14, 2002
    Inventors: Hideaki Morooka, Toshifumi Tsutsumi, Tomohiro Matsuyama, Yuichi Noguchi
  • Patent number: 6013961
    Abstract: In an electric motor having a rotation detection sensor, a pair of engagement recesses are provided on an axial end surface of a resin cylindrical body of a commutator. A permanent magnet is held around a rotary shaft of the motor with its one axial end surface being in abutment with the axial end surface of the cylindrical body. A pair of engagement recesses is provided on the other axial end surface of the magnet. A resin busing having a cylindrical part and a disk part is fitted on the rotary shaft at the side of the other axial end surface of the magnet. A pair of engagement protrusions is formed on the cylindrical part to be engaged with the engagement recesses of the cylindrical body, thereby restricting a relative movement between the bushing and the cylindrical body. Further, a pair of engagement protrusions is formed on the disk part to be engaged with the engagement recesses of the magnet, thereby restricting a relative movement between the bushing and the magnet.
    Type: Grant
    Filed: February 24, 1999
    Date of Patent: January 11, 2000
    Assignee: Asmo Co., Ltd.
    Inventors: Ryousuke Sakamaki, Masanori Ohishi, Hirokazu Tsuda
  • Patent number: 5909076
    Abstract: Alternators employing magnetic commutation, methods of manufacturing the alternators and wireless communications infrastructures employing the alternators. In one embodiment, an alternator includes: (1) a stator having 4n alternating field and armature poles extending axially along and projecting from an inner surface thereof, n being a positive integer, the field poles having field windings disposed thereabout to form alternating North-South magnetic polar regions and the armature poles having armature windings disposed thereabout to allow conduction of electric power from the armature poles, (2) a rotor, disposed within and journalled for rotation relative to the stator, having 2n axial magnetic passive regions, each of the passive regions being of a circumferential width magnetically to bridge one of the armature poles and only one of the field poles and (3) an exciter, coupled to the stator, that provides a controlled level of DC excitation to the field poles to regulate an output of the alternator.
    Type: Grant
    Filed: August 26, 1997
    Date of Patent: June 1, 1999
    Assignee: Lucent Technologies Inc.
    Inventor: William Craig Smith
  • Patent number: 5659210
    Abstract: A simple motor device for use as a learning tool includes a battery, a permanent magnet, an electrically conductive wire coil, a housing having an open bottom and parallel sidewalls to accommodate the battery, slotted grooves vertically traversing the sidewalls on an interior portion of the housing and forming openings at the top of the housing, E-shaped portions formed on both ends of the interior portion of the housing, and two specially adapted metallic supports that are positioned within their respective slotted grooves and extend through the openings on the top of the housing. One end of each metallic support contacts one end of the battery while the other end has an open yoke to electrically contact and support one end of the electrically conductive wire coil. A sub-housing portion of the housing is designed to accommodate the permanent magnet. The electrically conductive wire coil can rotate via the battery current running through it and the magnetic field produced from the permanent magnet.
    Type: Grant
    Filed: October 14, 1994
    Date of Patent: August 19, 1997
    Inventor: Bruce Yeany
  • Patent number: 5617241
    Abstract: A rotating polygon mirror for optical beam scanning. The polygon mirror is fixed to a rotating shaft and is rotated at a high speed by a drive force of a rotating drive with brushes. Additionally, a magnet is fixed to an inner circumferential surface of a yoke casing that supports the rotating shaft through a bearing, and a rotor core is positioned to confront the magnet fixed to the rotating shaft.
    Type: Grant
    Filed: June 28, 1994
    Date of Patent: April 1, 1997
    Assignee: Kabushiki Kaisha Sankyo Seiki Seisakusho
    Inventor: Hideo Kitazawa
  • Patent number: 5545936
    Abstract: An electrical machine of the reluctance or permanent magnet type includes one or more pawns of high permeance material which are relatively moveable along a plurality of C-shaped stators which are regularly spaced at a predetermined stator pitch dimension. The pawn or pawns are of a length equal to or exceeding the stator pitch dimension such that as the pawn is pulled into the air gap of a stator which is energized, the magnetic field induced in the pawn or provided by a permanent magnet is coupled to a following stator which is not yet energized to avoid reverse acceleration of the pawn and reduce vibration. The field coupled to the following stator also reduces the power required to establish a desired level of magnetic flux in the following stator when the following stator is energized. The cross-section of the air gap of the stator and the pawn are closely matched to maintain a minimum air gap when the pawn passes through the air gap of each stator.
    Type: Grant
    Filed: July 15, 1994
    Date of Patent: August 13, 1996
    Inventor: Norban E. Davenport
  • Patent number: 5519276
    Abstract: A DC compound motor of the type having a series winding and a shunt field winding includes an auxiliary generator driven by the motor for supplying power to the shunt field winding. The generator can be chosen, or a control circuit added, to control the current supply to the shunt field winding based on the speed of the motor.
    Type: Grant
    Filed: December 15, 1994
    Date of Patent: May 21, 1996
    Inventor: Tai-Her Yang