Rotating Disk Or Cylindrical Armature Patents (Class 335/272)
  • Patent number: 9257888
    Abstract: In one of its aspects the technology disclosed herein concerns a process of making a rotary solenoid. In a generic mode, the process comprises fitting together two mating core half members (22A, 22B) of a stator until two respective pole faces (32A, 32B) of the two mating core half members (22A, 22B) press to a positive stop against a precision diameter pin positioned between the two mating core half members and so that the two mating core half members interlock at the positive stop. The process further comprises removing the precision diameter pin to provide an axially extending space comprising a predetermined distance between the two respective pole faces (32A, 32B). The process further comprises inserting a rotor (26) within the axially extending space. The process further comprises fitting the two mating core half members (22A, 22B) and the rotor (26) between the two opposing end caps (20, 30).
    Type: Grant
    Filed: December 17, 2013
    Date of Patent: February 9, 2016
    Assignee: JOHNSON ELECTRIC S.A.
    Inventor: James M. Gruden
  • Patent number: 8957554
    Abstract: A stepping motor includes a stator, a rotor which is rotatable to the stator, a rotor-side position regulation part which is fixed to the rotor and is rotated together with the rotor, and a stator-side position regulation part which is fixed to the stator. The rotor includes a rotary shaft, and a rotor magnet which is mounted on an outer periphery of the rotary shaft. The rotary shaft is integrally formed with the rotor magnet by resin. The stator-side position regulation part includes a first stator-side position regulation part which contacts the rotor-side position regulation part at a first position to regulate a rotation of the rotor in one direction, and a second stator-side position regulation part which contacts the rotor-side position regulation part at a second position different from the first position to regulate a rotation of the rotor in an opposite direction to the one direction.
    Type: Grant
    Filed: June 13, 2012
    Date of Patent: February 17, 2015
    Assignee: Minebea Co., Ltd.
    Inventor: Masato Hata
  • Patent number: 8907753
    Abstract: The invention provides a rotary solenoid, comprising a stator and rotor that can rotate around a rotational axis, wherein the rotor has a rotor shaft on which a rotor disc is arranged, and the rotor disc, seen in the direction of circumference, has alternating magnetically polarized magnetic poles. The stator carries at least one coil carrying windings for conducting electric current. Between the coil and the rotor disc is a pole face having at least of two partial pole faces for guiding the magnetic flux of the magnetic field generated by the windings when current is applied. Elements of the magnetic system (the magnetic poles, the partial pole faces and the air gap) are configured along the direction of circumference depending on the rotational angle changeable in such a way that a torque results that returns the rotor in the starting position, when the current is switched off.
    Type: Grant
    Filed: March 27, 2012
    Date of Patent: December 9, 2014
    Assignee: Firma SVM Schultz Verwaltungs-GmbH & Co. KG
    Inventors: Winfried Willburger, Daniel Kreuzer
  • Patent number: 8729994
    Abstract: The invention refers to a Rotary Solenoid comprising a stator and rotor that can rotate around a rotational axis. The rotor has a rotor shaft on which a rotor disc is arranged. The rotor disc is, seen in the direction of the circumference, polarized alternating magnetically. The stator carries at least one coil. On the coil windings of electrically conducting wire are provided. For guiding the magnetic flow of the magnetic field generated by the coil a pole face consisting of several partial pole faces is provided.
    Type: Grant
    Filed: December 20, 2010
    Date of Patent: May 20, 2014
    Assignee: SVM Schultz Verwaltungs-GmbH & Co. KG
    Inventors: Winfried Willburger, Daniel Kreuzer
  • Patent number: 8633791
    Abstract: A rotary solenoid (1) includes a stator (10), a rotor (40), and a torsion spring (50) connected between the stator (10) and the rotor (40). The stator (10) includes an armature (13) having three stator poles (14, 15) cooperatively defining a substantially cylindrical space (18) and a coil (19) wound about one of the stator poles (14). The rotor (40) includes a shaft (42) rotatably assembled to the stator (10) and a rotor core (44) fixed to the shaft (42) and received in the cylindrical space (18). The rotor core (44) has three rotor poles (43) corresponding to the stator poles (14, 15). The rotor (40) stays at a first position under the force of the torsion spring (50) and rotates to a second position under the force of the torsion spring (50) and the magnetic force of stator (10) when the coil (19) is powered.
    Type: Grant
    Filed: June 20, 2013
    Date of Patent: January 21, 2014
    Assignee: Johnson Electric S.A.
    Inventors: Yue Li, Mao Xiong Jiang, Chui You Zhou, Jin Yun Gan, Xiao Mei Yuan, Ying Chen
  • Publication number: 20120249272
    Abstract: The invention provides a rotary solenoid, comprising a stator and rotor that can rotate around a rotational axis, wherein the rotor has a rotor shaft on which a rotor disc is arranged, and the rotor disc, seen in the direction of circumference, has alternating magnetically polarized magnetic poles. The stator carries at least one coil carrying windings for conducting electric current. Between the coil and the rotor disc is a pole face having at least of two partial pole faces for guiding the magnetic flux of the magnetic field generated by the windings when current is applied.
    Type: Application
    Filed: March 27, 2012
    Publication date: October 4, 2012
    Applicant: FIRMA SVM SCHULTZ VERWALTUNGS-GMBH & CO. KG
    Inventors: Winfried Willburger, Daniel Kreuzer
  • Patent number: 7857526
    Abstract: An electromagnetic actuator is provided, including a bobbin made of a non-magnetic material including a hollow cylindrical portion and disk flanges; a coil formed between the disk flanges; a power supply which supplies a current to the coil; a movable member pivoted on the hollow cylindrical portion; and a stationary member made of a permanent magnet and fixed to a disk flange. The movable member is a magnetic material and includes a shaft portion and a rotating portion. The rotating portion is fixed to the shaft portion, lies on the disk flange, and extends in a radial direction of the shaft portion. When the power supply supplies the current to the coil in a predetermined direction, the rotating portion is magnetized to a predetermined polarity and rotates. The stationary member includes a stopper for stopping rotation of the movable member at a predetermined rotational position.
    Type: Grant
    Filed: October 21, 2008
    Date of Patent: December 28, 2010
    Assignee: Hoya Corporation
    Inventor: Junki Tsujiyama
  • Patent number: 7852183
    Abstract: A no-back device for a power drive unit is configured such that, during operation of the power drive unit, the no-back device does not supply magnetic or frictional force against power drive unit rotation. The no-back device is implemented either redundantly or no-redundantly, and includes a latch rotor and an electromagnet. In both embodiments, the latch rotor is coupled to the power drive unit to rotate therewith, and the electromagnet is coupled to receive a flow of current and, upon receipt thereof, generates a magnetic field force that opposes rotation of the latch rotor. In the redundant embodiment, the no-back device further includes one or more permanent magnets, and the magnetic field generated by the electromagnet selectively opposes or aids the magnetic field supplied by the permanent magnet(s).
    Type: Grant
    Filed: May 12, 2006
    Date of Patent: December 14, 2010
    Assignee: Honeywell International Inc.
    Inventors: Calvin C. Potter, Casey Hanlon, Paul T. Wingett
  • Patent number: 7602268
    Abstract: An operation input device includes a base, a printed circuit board which has a plurality of pushbutton switches and Hall elements mounted on its upside and which is stacked on and united with the base, an operation plate which is supported on the base so as to be vertically movable on the printed circuit board, and a disc type operation dial in which an annular magnet with N-poles and S-poles arranged alternately is assembled on the underside of this operation dial and which is turnably assembled on the upside of the operation plate. Here, the disc type operation dial is turned, thereby to sense the changes of the magnetic fluxes of the annular magnet by the Hall elements and to detect a turning direction, while the disc type operation dial is depressed, thereby to operate any of the pushbutton switches through the operation plate. The operation dial is prevented from becoming rickety in a horizontal direction, and it ensures a smooth turning operation, thereby to afford a good operation feeling.
    Type: Grant
    Filed: April 3, 2006
    Date of Patent: October 13, 2009
    Assignee: OMRON Corporation
    Inventors: Takeshi Miyasaka, Kazuaki Miyoshi
  • Patent number: 7554225
    Abstract: An electric motor for a small-scale electrical appliance, such as a toothbrush or shaver. The electric motor includes at least one oscillatory motor component, a magnet arrangement having at least one permanent magnet, and a coil for generating a magnetic field which, in interaction with the magnet arrangement, generates a force for excitation of an oscillatory linear motion. During the interaction between the magnet arrangement and the magnetic field produced by the coil, a torque for excitation of an oscillatory rotational motion is additionally generated.
    Type: Grant
    Filed: May 25, 2006
    Date of Patent: June 30, 2009
    Assignee: Braun GmbH
    Inventors: Bernhard Kraus, Hansjörg Reick, Uwe Schober, Alexander Schröter
  • Patent number: 7513703
    Abstract: A magnetic actuator according to the present invention includes a stator yoke made of a magnetic substance and having projecting streaks on the inner circumference thereof to produce magnetic bias to a rotor magnet. The stator yoke is fitted into and fixed to a coil bobbin, a base plate, or a sheet metal having a concave portion formed therein. This can hold shading members to a totally closed position after shutoff of electric current through a coil and can stably achieve an appropriate position of the stator yoke in a rotation direction to eliminate the need for fixing the stator yoke with an adhesive or the like.
    Type: Grant
    Filed: November 30, 2007
    Date of Patent: April 7, 2009
    Assignee: Canon Kabushiki Kaisha
    Inventor: Higashiyama Yasuyuki
  • Patent number: 7511391
    Abstract: An electromagnetic actuator has a rotor and a stator around which coils are wound to face portions of an outer surface of the rotor. The stator is C-shaped, the rotor is arranged so that a rotation axis thereof is existent in a space surrounded by the stator, and both ends of the stator are respectively formed within a range from 15 to 90 degrees from a virtual base line with respect to the rotation axis serving as a center, when the virtual base line is set to run a center of the rotation axis and separate the stator into left and right.
    Type: Grant
    Filed: February 27, 2006
    Date of Patent: March 31, 2009
    Assignee: Seiko Precision Inc.
    Inventors: Hisashi Kawamoto, Satoru Tada, Takashi Nakano
  • Publication number: 20090033449
    Abstract: An electronic device includes a housing, a connecting member and a roller. The housing has a track and an aperture. The connecting member moves along the track. The roller rotatably connects with an end of the connecting member. The connecting member moves the roller to be exposed through the aperture or concealed in the housing.
    Type: Application
    Filed: July 31, 2008
    Publication date: February 5, 2009
    Applicant: QISDA CORPORATION
    Inventor: Chi-Fang Liu
  • Patent number: 7453341
    Abstract: The present invention is a system and method for utilizing magnetic energy. The basic principles of the present invention may be implemented in a variety of systems and methods. A magnet may be rotated or an electromagnet may be controlled in order to control a magnetic field generated by a set of magnets. As a result, numerous, substantial benefits may be achieved by providing at least one set of multiple magnets. For example, the present invention may be used in systems and methods to perform a variety of functions including, but not limited to: (1) to control, manipulate, hold, and/or release a load; (2) to open and/or close a pathway; (3) to open and/or close a circuit; (4) to apply a magnetic field to a load and/or to remove a magnetic field from a load; (5) to intermittently apply and remove a magnetic field; (6) to increase the magnetic field that may be applied to a load; (7) to induce a load into motion; (8) to create energy; and (9) to improve the energy efficiency of a device or system.
    Type: Grant
    Filed: July 8, 2005
    Date of Patent: November 18, 2008
    Inventor: Jack W. Hildenbrand
  • Patent number: 7408433
    Abstract: A pin lock is movably mounted for linear movement along a longitudinal axis. A magnet, preferably a permanent magnet, is mounted for limited rotation between the pin extended and pin retracted positions. An electromagnet provides a controllable electromagnetic field which encompasses at least a portion of the permanent magnet. A ferromagnetic latch is located within the magnetic field of the mounted magnet in each of the pin extended and pin retracted positions. A mechanical interconnection between the pin lock and the permanent magnet for moving the pin lock when the permanent magnet is rotated wherein the movement extends or retracts the pin lock between its pin extended and pin retracted positions. Reversing the electromagnetic field of the electromagnet serves to rotate the magnet so that the pin lock moves from one to the other of the two positions.
    Type: Grant
    Filed: January 12, 2007
    Date of Patent: August 5, 2008
    Assignee: Saia-Burgess Inc.
    Inventor: James C. Irwin
  • Publication number: 20070279168
    Abstract: A bi-stable magnetic switch assembly is provided that comprises a stator and a rotor, which is configured for rotation with respect to the stator between a first latched position and a second latched position. The stator and the rotor cooperate to form a first magnetic path and a magnetic path having a shared portion. A spring, which is coupled to the rotor, biases the rotor toward the first and second latched positions when the rotor is in the second and first latched positions, respectively. At least one magnet is fixedly coupled to either the stator or the rotor. The magnet is included within the first magnetic path and configured to produce a magnetic latching force that biases the rotor toward first latched position when the rotor is closer to the first latched position than to the second latched position, and toward the second latched position when the rotor is closer to the second latched position than to the first latched position.
    Type: Application
    Filed: June 6, 2006
    Publication date: December 6, 2007
    Inventor: David A. Osterberg
  • Publication number: 20070164640
    Abstract: A step motor mounted inside a camera for moving a driven member is disclosed to include a yoke iron, which has a base, two arms respectively extended from two sides of the base, and four magnetic poles respectively formed on the free ends of the arms and each junction between the base and the arms, two windings respectively surrounding the two arms of the yoke iron, a magnet, which is rotatably floating among the magnetic poles of the yoke iron by a magnetic force has sectors of different magnetic poles abutted against one another, and a crank, which is coupled to and rotatable with the magnet and has an actuating axle connected to the driven member of the camera for moving the driven member upon rotation of the magnet.
    Type: Application
    Filed: January 17, 2007
    Publication date: July 19, 2007
    Applicant: TRICORE CORPORATION
    Inventor: T. C. Huang
  • Patent number: 6960848
    Abstract: An electromagnetic drive device includes a coil frame with a hollow tubular shape, a magnet rotor rotatably disposed in the coil frame through a rotational shaft, a transmission member for transmitting a rotation of the magnet rotor, and a coil wound around an outer periphery of the coil frame. The coil frame is formed of two coil frame halves divided vertically along the rotational shaft of the rotor, and the coil is wound in a direction crossing connection faces (joint faces) of the two coil frame halves on upper and lower end surfaces thereof.
    Type: Grant
    Filed: March 16, 2004
    Date of Patent: November 1, 2005
    Assignee: Nisca Corporation
    Inventors: Hiroaki Naganuma, Tetsuyuki Tohyama
  • Patent number: 6933818
    Abstract: A torque motor may include a rotor having at least two magnets disposed thereon, and a stator having a core and at least one coil. The magnets are arranged and constructed so that the outer surfaces thereof alternately have a N pole and a S pole. The magnets cover the rotor over an angle of less than 360 degrees. The core has a first and second magnetic pole elements. The magnetic pole elements are arranged and constructed such that an angle defined between a first straight line passing through a center of the first magnetic element and a center of rotation of the rotor and a second straight line passing through a center of the second magnetic element and the center of rotation of the rotor is less than 180 degrees.
    Type: Grant
    Filed: June 24, 2004
    Date of Patent: August 23, 2005
    Assignee: Aisan Kogyo Kabushiki Kaisha
    Inventor: Susumu Kaneshige
  • Patent number: 6926454
    Abstract: An electromagnetic driving unit includes a rotor having a central shaft and formed of a permanent magnet with a hollow cylindrical shape; an inner yoke disposed on an inner circumferential side of the rotor; an outer yoke disposed on an outer circumferential side of the rotor; and a coil for exciting the inner yoke and outer yoke. The inner yoke has a shaft portion at an end portion thereof inserted into the rotor, and the shaft portion has a circular cross-section or an oval cross-section perpendicular to an axial direction of the shaft portion. The rotor has a bearing recess in an inner circumferential wall thereof, so that the shaft portion of the inner yoke slidably fits in the bearing recess.
    Type: Grant
    Filed: September 24, 2004
    Date of Patent: August 9, 2005
    Assignee: Nisca Corporation
    Inventors: Hiroaki Naganuma, Yosuke Sasiki
  • Patent number: 6840223
    Abstract: This invention is an armature and an armature driving device in which the armature is rotated around its axis so as to inhibit uneven wear from occurring between the armature and a housing. That is, an armature which is slidably provided within a housing filled with fluid and which divides the inside of the housing into two fluid chambers is further provided with a communicating hole that enables the fluid to pass between the two fluid chambers. This communicating hole is formed such that the fluid passing through the communicating hole and out from the armature when the armature slides flows out at an angle to, and to the side of, a center axis of the armature.
    Type: Grant
    Filed: March 7, 2003
    Date of Patent: January 11, 2005
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventor: Kazuyuki Fukuhara
  • Publication number: 20040183383
    Abstract: An oscillating motor 10 has a rotor rotation of about ±15° from a rest position. The rotor 11 has two salient poles 12 which face a respective permanent magnet 13 across a small air gap 14. The stator has a laminated stator core 15 supporting the magnets 13 and also two salient poles 16 each supporting a stator coil 17. The stator poles 16 confront the rotor across a small air gap 18 between the rotor poles. When no current is flowing through the coils, the rotor 11 rests in a rest position with the poles 12 aligned between the north and south poles of the magnets 13. During operation, the stator coils 17 induce like magnetic poles in the stator poles 16 which in turn induce like magnetic poles in the rotor poles 12 causing the rotor 11 to swing towards opposite magnetic poles of the permanent magnets 13. When current flows in the reverse direction, the rotor 11 swings to the opposite poles of the magnets 13.
    Type: Application
    Filed: March 11, 2004
    Publication date: September 23, 2004
    Applicant: JOHNSON ELECTRIC S.A.
    Inventor: Georg Strobl
  • Patent number: 6756873
    Abstract: A rotary actuator (16) includes a rotor (48) which is disposed in a housing (34) between first and second pole pieces (42 and 44) of a stator (40). The rotor (48) is rotatable relative to the stator (40) between an unactuated position (FIG. 4) and an actuated position (FIG. 5). During rotation of the rotor (48), the axial extent of a first working air gap (66) between the rotor and a first pole piece (44) of the stator (40) remains constant. However, the axial extent of the working air gap (64) between the rotor (48) and the second pole piece (42) of the stator (40) decreases as the rotor moves from the unactuated position to the actuated position. In a preferred embodiment, the rotor lobes are made so that the net axial force of all of the rotor lobes is substantially zero thereby reducing stress on the rotor shaft support bearings.
    Type: Grant
    Filed: September 12, 2001
    Date of Patent: June 29, 2004
    Assignee: SAIA-Burgess Inc.
    Inventor: David B. Mohler
  • Patent number: 6750748
    Abstract: A torque motor comprising a rotor assembly and a stator assembly, the rotor assembly including a permanent rotor magnet being diametrically oriented, and the stator assembly including a pair of upper and lower stator poles spaced circumferentially around the rotor assembly wherein the stator poles are asymmetric in construction.
    Type: Grant
    Filed: August 9, 2001
    Date of Patent: June 15, 2004
    Assignee: Delphi Technologies, Inc.
    Inventor: Robert J. Byram
  • Patent number: 6507257
    Abstract: A bi-directional latching actuator is comprised of an output shaft with one or more rotors fixedly mounted thereon. The shaft and rotor are mounted for rotation in a magnetically conductive housing having a cylindrical coil mounted therein and is closed by conductive end caps. The end caps have stator pole pieces mounted thereon. In one embodiment, the rotor has at least two oppositely magnetized permanent magnets which are asymmetrically mounted, i.e., they are adjacent at one side and separated by a non-magnetic void on the other side. The stator pole piece has asymmetric flux conductivity and in one embodiment is axially thicker than the remaining portion of the pole piece. An abutment prevents the rotor from swinging to the neutral position (where the rotor magnets are axially aligned with the higher conductivity portion of the pole piece). Thus, the rotor is magnetically latched in one of two positions being drawn towards the neutral position.
    Type: Grant
    Filed: March 30, 2001
    Date of Patent: January 14, 2003
    Assignee: SAIA-Burgess Inc.
    Inventor: David B. Mohler
  • Patent number: 6472967
    Abstract: An actuator for rotating (or moving) a rotor (or a moving member) according to the current flowing through an electromagnetic coil. Magnetic energy of magnetomotive force induced in the electromagnetic coil when energized is stored in an air gap and a sub-air gap provided in a magnetic path. The rotor (or the moving member) comes to rest at a position where the stored magnetic energy becomes the smallest. The stored magnetic energy serves as a source of counterforce and functions in the same way as a spring.
    Type: Grant
    Filed: October 20, 1997
    Date of Patent: October 29, 2002
    Assignee: Mikuni Corporation
    Inventor: Tetsuo Muraji
  • Publication number: 20020149294
    Abstract: A two-dimensional driving actuator comprises a flat spring structure, and a driver for driving the flat spring structure. The flat spring structure includes a moving plate, a moving inner frame surrounding the moving plate, first torsion bars coupling the moving plate and the moving inner frame so as to allow the moving plate to be vibrated relative to the moving inner frame, a fixed outer frame surrounding the moving inner frame, and second torsion bars coupling the moving inner frame and the fixed outer frame so as to allow the moving inner frame to be vibrated relative to the fixed outer frame. The flat spring structure is manufactured from a single semiconductor substrate. The first and second torsion bars are made of different materials.
    Type: Application
    Filed: April 12, 2002
    Publication date: October 17, 2002
    Applicant: OLYMPUS OPTICAL CO., LTD.
    Inventors: Kazuya Matsumoto, Masahiro Katashiro, Hiroshi Miyajima, Toshihiko Isokawa
  • Publication number: 20020030572
    Abstract: A rotary actuator (16) includes a rotor (48) which is disposed in a housing (34) between first and second pole pieces (42 and 44) of a stator (40). The rotor (48) is rotatable relative to the stator (40) between an unactuated position (FIG. 4) and an actuated position (FIG. 5). During rotation of the rotor (48), the axial extent of a first working air gap (66) between the rotor and a first pole piece (44) of the stator (40) remains constant. However, the axial extent of the working air gap (64) between the rotor (48) and the second pole piece (42) of the stator (40) decreases as the rotor moves from the unactuated position to the actuated position. In a preferred embodiment, the rotor lobes are made so that the net axial force of all of the rotor lobes is substantially zero thereby reducing stress on the rotor shaft support bearings.
    Type: Application
    Filed: September 12, 2001
    Publication date: March 14, 2002
    Inventor: David B. Mohler
  • Patent number: 6336373
    Abstract: A drivig rotary shaft and a follower rotary shaft are rotatably carried in a housing of a rotary solenoid. Operating members fixed to the rotary shafts by clips are operatively connected to each other by gears, and a locked member is locked non-movably by locking surfaces formed at tip ends of the operating members. This makes it unnecessary to provide a device for converting a rectilinear motion to a rotational motion such as a pin and an elongated bore in a path of transmission of a driving force from the rotary solenoid to the operating members. Therefore, not only the number of parts and the number of assembling steps are reduced, but also the number of slide areas, where a friction resistance and looseness are liable to be produced, is reduced, thereby enabling a noiseless smooth operation.
    Type: Grant
    Filed: March 29, 2000
    Date of Patent: January 8, 2002
    Assignee: Keihin Corporation
    Inventors: Masakazu Murai, Shigeto Ryuen
  • Patent number: 6124774
    Abstract: The present invention relates to an electromagnetically controlled drive device, in particular a ratio meter, the device being of the type comprising: a set of control coils (10, 20); a frame (50) which carries the set of coils (10, 20); equipment including a magnet suitable for being pivoted by the set of control coils (10, 20); and magnetic shielding (100) surrounding the set of coils (10, 20) and the support frame, at least in part, the device being characterized by the fact that the shielding (100) comprises an annular skirt (110) that is not a circular cylinder.
    Type: Grant
    Filed: October 2, 1998
    Date of Patent: September 26, 2000
    Assignee: Magneti Marelli France
    Inventor: Vincent Quelo
  • Patent number: 6078236
    Abstract: A rotary solenoid is disclosed which comprises a support member, a U-shaped core secured to the support member such that a limb of the core extends through an opening provided in the support member, a coil encircling part of the core, the coil being carried by the support member, and an armature rotatably mounted upon the support member.
    Type: Grant
    Filed: October 10, 1997
    Date of Patent: June 20, 2000
    Assignee: Lucas Industries plc
    Inventors: David Brian Mohler, Philip Edward Fugate
  • Patent number: 6020804
    Abstract: An electromagnetic actuator has four positions which are stable in the absence of a current and moves rapidly between these positions when acted upon by a current. The actuator has a thin, rotatable magnet (3) with two pairs of magnetic poles transversally magnetised in alternate directions, and a stator member having four pole pieces (9-12, 34-37, 48-51) of developed length P, each with an excitation coil. Two consecutive poles of the thin magnet (3) are spaced by a distance d. The thin magnet (3) is movable in an airgap of width E. wherein the size ratio P:E and P:d is greater than 8. The invention is useful for driving a device such as a valve or a switch.
    Type: Grant
    Filed: May 15, 1998
    Date of Patent: February 1, 2000
    Assignee: Sonceboz S.A.
    Inventor: Pierre Gandel
  • Patent number: 6006794
    Abstract: Device to block weft yarn associated with a measuring weft feeder for fluid jet looms. The device is located downstream of the outlet yarn guide and/or of the antiballoon device of the feeder, and comprises a single elongated body which includes: an inlet cone and a cylindrical channel crossed by the weft yarn, the common axis of which is the longitudinal axis of the device; a core to block the yarn, movable into a guide perpendicularly to the axis and adapted to penetrate into the channel through an opening thereof; electromagnetic elements acting on the core against a return spring; and a bush associated to the channel, in correspondence of the opening, to form a contrast surface onto which the core engages in order to block the yarn.
    Type: Grant
    Filed: March 25, 1998
    Date of Patent: December 28, 1999
    Assignee: Nuova Roj Electrotex S.r.l.
    Inventor: Marco Covelli
  • Patent number: 5926664
    Abstract: An electromagnetic actuator includes a core made of a soft magnetic material, a permanent magnet located between a pair of ends of the core, the permanent magnet being supported for movement, and an electrically conductive coil wrapped about a portion of the core. The reluctance of the core is adjustable to alter movement of the permanent magnet as a function of time upon application of electrical current to the coil of the electromagnetic actuator.
    Type: Grant
    Filed: October 31, 1997
    Date of Patent: July 20, 1999
    Assignee: Eastman Kodak Company
    Inventors: Paul L Taillie, Joel Sherwood Lawther, John K Erickson
  • Patent number: 5708406
    Abstract: An improved rotary actuator having a reduced height is disclosed. The actuator has a stator core having excitable poles and yokes, a rotor with a rotor magnet, a bobbin frame having a rotor container and bobbin portions with excitable coils. The rotor container has a bore for receiving the rotor and magnet openings for receiving a pair of stator magnets. Each bobbin portion has a slot for receiving the excitable pole. The yokes are placed at the both sides of the bobbin. The rotor container has magnetic pole slots extending in an axial direction of the rotary magnet, each of which is open to the bore and communicates with the associated pole receiving slot of the bobbin portion. Magnetic pole pieces are mounted in the magnetic pole slots. Each magnetic pole piece has a surface facing the rotor magnet and another surface magnetically connected to the stator core.
    Type: Grant
    Filed: January 25, 1996
    Date of Patent: January 13, 1998
    Assignee: ASMO Co. Ltd.
    Inventors: Akira Tsunoda, Hiroyuki Fujita
  • Patent number: 5703555
    Abstract: A rotary actuator includes a pole riser that acts as a mechanical stop and provides advantageous magnetic latching features, which overcome the problems typically associated with the end of travel in conventional rotary actuators. The pole riser designed in accordance with this invention includes a necked region of reduced cross-sectional area, which allows for an air gap to be maintained between at least a portion of the pole riser and the rotor pole at the end of travel. The pole riser necked region provides an additional flux pathway that is magnetically saturated and the remainder of the pole riser provides a magnetic pathway for a latching flux, which maintains the rotor in an end of travel position without requiring an increase in the current through the coil. A rotary actuator design and control methodology are disclosed.
    Type: Grant
    Filed: April 25, 1995
    Date of Patent: December 30, 1997
    Assignee: ITT Automotive Electrical Systems Inc.
    Inventor: Roy A. McCann
  • Patent number: 5699031
    Abstract: Electromagnetic actuator with rotary core, comprising, housed in a casing: a magnetic yoke, a pair of fixed adjacent coils alternately energized, and a rotating element with a magnetic core; the yoke, the coils and the core having a common axis coinciding with that of the actuator, and the core being positioned between and/or within said coils, so as to close alternative circuits of magnetic flux, generated in the yoke by either one of the coils, between opposite axial pole pieces and central radial pole pieces of the yoke. In the actuator: the yoke (2) comprises a single radial pole piece (11) common to both coils (3, 4) and two sets of axial end pole pieces (13, 14).
    Type: Grant
    Filed: December 4, 1995
    Date of Patent: December 16, 1997
    Assignee: Nuova Roj Electrotex S.r.l.
    Inventors: Marco Covelli, Enzo Dandolo
  • Patent number: 5682129
    Abstract: An electrical actuator comprises a first actuator body (1) and a second actuator body (3). The first actuator body comprises two diametrically opposed magnetic poles (N) and (S). The second actuator body is made of a soft-magnetic material and comprises three inwardly directed radial teeth (19, 20 and 21). In order to obtain a maximal ratio between the delivered torque and the applied electric power, only two teeth (19 and 21) are provided with exciter coils (29 and 31). In order to minimize detent torques the three teeth are identical to each other and the first actuator body is suitably diametrically magnetized.
    Type: Grant
    Filed: December 9, 1991
    Date of Patent: October 28, 1997
    Assignee: N.V. Airpax S.A.
    Inventor: Alois Eduard Christiaens
  • Patent number: 5677659
    Abstract: An electromagnetic actuator rotatable about an axis including a stator magnet circuit (2) with an inner pole (9) having a central core (11), a first pole shoe (12) forming the continuation of the core at one axial end of the stator circuit and extending through an angle of approximately 180.degree., and a single coil (3) coaxially surrounding the central core (11), the core (11) and the coil (3) being off-center relatively to the axis of rotation; and an outer pole (10) having a lateral armature (13.sub.2) in the form of a tubular sector outside the coil (3) and parallel to the core (11), and a second pole shoe (14) forming the continuation of the armature (13.sub.2) at the axial end of the stator circuit and extending through an angle of approximately 180.degree.; the ends of the central core (11) and of the armature (13) which are remote from the respective pole shoes being mutually in contact.
    Type: Grant
    Filed: March 23, 1995
    Date of Patent: October 14, 1997
    Assignee: Societe D'Applications Generales D'Electricite et de Mecanique-Sagem
    Inventor: Yves Porcher
  • Patent number: 5605129
    Abstract: An electrically controlled actuator includes a rotor detachably mounted on a rotating shaft, and a stator disposed around the rotor. A fluid flow plate is mounted on the rotating shaft and opens/closes a fluid passageway. A spiral spring is mounted on one end of the rotating shaft. When the rotor is rotated, the fluid flow plate regulates a fluid flow in the fluid passageway. An electrical control current is received in the actuator and is converted to a magnetic torque to rotate the rotor, while the spiral spring is increased in tension. The spiral spring opposes the rotation of the rotor so as to control the position of the fluid flow plate. The rotor includes two symmetric tips extended from two curved outer surfaces at two leading edges of the rotor. An air gap is defined between the inner surfaces of the stator and the outer surfaces of the rotor. The air gap becomes narrower when the rotor is rotated into a space between two poles of the stator.
    Type: Grant
    Filed: November 29, 1994
    Date of Patent: February 25, 1997
    Assignee: Onan Corporation
    Inventors: David W. Strombeck, Michael C. Miller
  • Patent number: 5592136
    Abstract: The present invention relates to an electromagnet apparatus having a coil wound around a bobbin, a core fixed to and supported by the bobbin to cover at least a portion of the surface of the coil and having a slant serving as a first pole head, the force of which acts in a direction of the surface of the coil, and a rotatively supported around a center of winding of the coil around the bobbin and having a slant serving as a second pole head, the force of which acts in a direction of the surface of the bobbin, wherein the slant of the core and that of the rotor are disposed to face each other with a predetermined air gap maintained with which the rotor is able to attractively rotate with respect to the core.
    Type: Grant
    Filed: June 10, 1994
    Date of Patent: January 7, 1997
    Assignee: Olympus Optical Co., Ltd.
    Inventor: Moriya Katagiri
  • Patent number: 5512871
    Abstract: A constant-torque single-phase electromagnetic actuator including a stationary device including a first magnetic stator circuit made of a high-permeability material and excited by at least one field coil (10), and a movable device (1) including an axially magnetized disc (3) having 2N pairs of magnetic poles magnetized in alternate directions, wherein the magnetization is substantially uniform. The magnetized disc (3) is attached to a second magnetic circuit (6) made of a high-permeability material, and the movable device is provided with a coupling shaft (7). The connection between the stationary device (1) and the movable device (2) allows at least some axial play of the coupling shaft (7) away from the stationary stator device (2), and the diameter of the magnetized disc (3) is substantially identical to that of the poles of the stator circuits. Play between the stationary (2) and Movable (1) devices is compensated by the magnetic attraction exerted by the stationary device on the movable one.
    Type: Grant
    Filed: November 28, 1994
    Date of Patent: April 30, 1996
    Assignee: Moving Magnet Technologies S.A.
    Inventors: Claude Oudet, Daniel Prudham
  • Patent number: 5442338
    Abstract: A miniature telltale module which combines a plurality of telltale functions into one unit and provides reduced cost per function. The module uses a miniature rotary actuator, a series of interconnected images and a single light source. The actuator allows a wide tolerances at the inputs while still precisely selecting the image positions. The actuator has a unique locking device (or brake) which automatically engages when power is removed. This feature allows the control circuitry to select an image with a momentary pulse and then remove the power from the actuator. Power consumption is thereby minimized since no power is required by the device except when changing the image to be displayed.
    Type: Grant
    Filed: May 3, 1993
    Date of Patent: August 15, 1995
    Assignee: Nu-Tech & Engineering, Inc.
    Inventors: John A. Ayres, David L. Ehle
  • Patent number: 5398013
    Abstract: The invention is directed to an actuator which is mounted on a base to rotate a rotary member about a rotational axis thereof. The actuator includes a first magnetic rotary member which is rotatably mounted on the base about the axis, and provided with a first engaging portion which traces a peripheral locus about the axis. It also includes a second magnetic rotary member which is rotatably mounted about the axis, and provided with a second engaging portion engageable with the first engaging portion on the peripheral locus about the axis. The first engaging portion is moved to be engageable with the second engaging portion when the first rotary member is rotated in one direction relative to the second rotary member, and the first engaging portion is moved to be away from the second engaging portion when the first rotary member is rotated in the opposite direction.
    Type: Grant
    Filed: July 20, 1994
    Date of Patent: March 14, 1995
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventors: Katsumi Suzuki, Hideya Hori, Mamoru Nakamura
  • Patent number: 5394131
    Abstract: The invention concerns a bistable magnetic drive with an assembled armature 3, 4 consisting of a high-grade, disk-shaped permanent magnet 3 with two appropriately shaped pole pieces 4,4' and displaceable sideways off the coil 1 transversely to its axis inside an electromagnetic annular pole-piece Rp between two electromagnetic stop pole-pieces 5, 5'. The invention describes illustrative embodiments and applications of this drive as an excursion and oscillating magnet, further a circuit for DC operation. A capacitor circuit furthermore allows mono-stable operation. The advantages are a lightweight armature, high efficiency, bilateral operation, versatility and simplicity.
    Type: Grant
    Filed: June 22, 1992
    Date of Patent: February 28, 1995
    Inventor: Cornelius Lungu
  • Patent number: 5304881
    Abstract: A device for converting magnetic force to mechanical force including a member having an axis about which it is rotatable, the member having a peripheral edge portion formed of a material that is effected by the presence of a magnetic force adjacent thereto, at least one magnetic member positioned adjacent the peripheral portion of the rotatable member to produce a magnetic coupling force therebetween, the peripheral portion of the rotatable member having a shape such that the magnetic coupling between the magnetic member and the peripheral portion of the rotatable member varies continuously as the rotatable member rotates.
    Type: Grant
    Filed: March 13, 1989
    Date of Patent: April 19, 1994
    Assignee: Magnetic Revolutions, Inc.
    Inventors: Charles J. Flynn, David M. Flynn
  • Patent number: 5293144
    Abstract: An electric rotary actuator, particularly for controlling a throttle cross-section in a line conducting operating fluid of an internal combustion engine has a housing, motor actuating unit including windings and magnetic poles located in the housing and magnetic armature rotatable relative to the windings and to the magnetic poles, a throttle. The housing has ducts leading into an interior space between the windings and each having an end at another end face of the armature. The armature has at least one cutout extending in an axial direction and bringable in alignment with the ducts. The armature forms the throttle member through which a fluid to be controlled is conducted.
    Type: Grant
    Filed: January 31, 1992
    Date of Patent: March 8, 1994
    Assignee: Robert Bosch GmbH
    Inventor: Erwin Krimmer
  • Patent number: 5243241
    Abstract: A fine tracking miniature galvanometer actuator is used as a fine tracking positioner for a read/write head in the optical disk drive of an information storage and/or retrieval system. An efficient magnetic circuit is used in conjunction with a small and lightweight rotor design which offers high performance characteristics in terms of frequency response and sensitivity. No mechanical springs or torsion bars are necessary to maintain the rotor in a neutral or zero position. The present invention is also useful in other systems using electro-optical transducers including reflecting-type galvanometer recording systems used for producing variable-area sound tracks .
    Type: Grant
    Filed: March 15, 1990
    Date of Patent: September 7, 1993
    Assignee: Digital Equipment Corporation
    Inventor: Cheng-hua Wang
  • Patent number: 5239961
    Abstract: A rotary idle-speed actuator for controlling a throttle cross-section in a line carrying combustion air for an internal combustion engine has an actuating motor with a stator and a rotor. The rotor is mounted on a shaft of a throttle member which more or less opens a control opening. The rotor has a cup-shaped form with a bottom and a cylinder-jacket-shaped wall. The stator has field windings and is arranged together with the field windings inside the rotor, and the stator is mounted only at its end which is opposite to the bottom of the rotor.
    Type: Grant
    Filed: February 12, 1992
    Date of Patent: August 31, 1993
    Assignee: Robert Bosch GmbH
    Inventors: Klaus Neidhard, Harald Kalippke, Friedrich Wendel, Erhard Renninger, Wolfgang Staudenmaier, Johannes Meiwes, Albert Gerhard, Dieter Dick, Herbert Becker
  • Patent number: RE40503
    Abstract: A rotary actuator (16) includes a rotor (48) which is disposed in a housing (34) between first and second pole pieces (42 and 44) of a stator (40). The rotor (48) is rotatable relative to the stator (48) between an unactuated position (FIG. 4) and an actuated position (FIG. 5). During rotation of the rotor (48), the axial extent of a first working air gap (66) between the rotor and a first pole piece (44) of the stator (40) remains constant. However, the axial extent of the working air gap (64) between the rotor (48) and the second pole piece (42) of the stator (40) decreases as the rotor moves from the unactuated position to the actuated position. In a preferred embodiment, the rotor lobes are made so that the net axial force of all of the rotor lobes is substantially zero thereby reducing stress on the rotor shaft support bearings.
    Type: Grant
    Filed: September 29, 2005
    Date of Patent: September 16, 2008
    Assignee: SAIA-Burgess Inc.
    Inventor: David B. Mohler