With Other Elements Patents (Class 310/48)
  • Patent number: 11325641
    Abstract: An object of the present invention is to provide an electric power steering apparatus capable of improving reliability of a drive device for a three-phase synchronous motor without increasing a cost of the drive device. A control device for controlling an electric power steering apparatus according to the present invention is a control device for controlling an electric power steering apparatus using a three-phase synchronous motor as a force assisting in a steering operation, includes: a rotational position estimation unit that estimates a position of a rotor of the three-phase synchronous motor on the basis of a neutral point potential or a virtual neutral point potential of the three-phase synchronous motor; and a command signal computing unit that computes a command signal to the three-phase synchronous motor on the basis of the position of the rotor estimated by the rotational position estimation unit.
    Type: Grant
    Filed: June 13, 2016
    Date of Patent: May 10, 2022
    Assignee: Hitachi Astemo, Ltd.
    Inventors: Takafumi Hara, Toshiyuki Ajima, Mitsuo Sasaki, Yoshitaka Iwaji, Shigehisa Aoyagi, Takumi Hisazumi
  • Patent number: 10668613
    Abstract: A power tool includes a slide switch which is configured to provide variable speed control of the rotational velocity of a drive member as well as provide ON/OFF functionality for the tool 10 based on the position of the switch. The slide switch eliminates the need for a separate switch for turning the tool on and off.
    Type: Grant
    Filed: March 12, 2014
    Date of Patent: June 2, 2020
    Assignees: Robert Bosch Tool Corporation, Robert Bosch GmbH
    Inventors: Stuart Ogle, Hsiu-Kai Liao
  • Patent number: 10108198
    Abstract: A robotic work tool system (200) comprising a robotic work tool (100) comprising a lift/collision detection sensor (190), said lift/collision detection sensor (190) comprising a polarity element (191) and at least a first sensing element (192?) and a second sensing element (192?), wherein the polarity element (191) has a first and a second polarity and wherein the first and second sensing elements are configured to each sense a polarity of the first polarity element (191). The robotic work tool (100) is configured to detect a polarity change in the first sensing element (192?) and in the second sensing element (192?) and in response thereto determine that a lift has been detected, or detect a polarity change in the first sensing element (192?) but not in the second sensing element (192?) and in response thereto determine that a collision has been detected.
    Type: Grant
    Filed: March 26, 2015
    Date of Patent: October 23, 2018
    Assignee: HUSQVARNA AB
    Inventors: Jonathan Björn, Anders Sjögren
  • Patent number: 9813002
    Abstract: A motor controller comprises: a rotation angle estimation unit for estimating and computing a rotation angle of a motor repeatedly based on the current and voltage of the motor without using a motor rotation angle detector; a speed calculation unit for calculating the period of the signal waveform of the rotation angle that is repeatedly estimated and calculated by the rotation angle estimation unit and for calculating an actual rotational speed of the motor based on the period; a drive signal generating unit for generating a drive signal to drive and control the motor based on at least a deviation between the actual rotational speed and a target rotational speed and the rotation angle; and a switching circuit that is switched based on the drive signal to provide drive power to the motor.
    Type: Grant
    Filed: August 12, 2014
    Date of Patent: November 7, 2017
    Assignee: SHIMADZU CORPORATION
    Inventor: Nobuhiko Moriyama
  • Patent number: 9242362
    Abstract: A power tool includes a variable speed motor coupled to a drive member. A power circuit electrically connects the variable speed motor to a power source. A variable speed signal generator generates a variable speed control signal indicating an operating speed for the motor. The operating speed is dependent upon a value of a variable speed selection signal generated by a slide switch. The slide switch includes a linear slide potentiometer for generating the variable speed selection signal. An actuator slides along the potentiometer to control the value of the selection signal. The slide switch includes an ON/OFF contact and a lever arm that is movable into and out of contact with the ON/OFF contact. The actuator is configured to prevent the lever arm from contacting the ON/OFF contact when the actuator is in an OFF position in relation to the slide potentiometer thereby opening the power circuit.
    Type: Grant
    Filed: September 7, 2012
    Date of Patent: January 26, 2016
    Assignee: Robert Bosch GmbH
    Inventors: Edward Abante, Mike Landt, Daniel Blythe
  • Publication number: 20150108856
    Abstract: In order to achieve improvement in speed and torque of a rotating electric machine according to an inexpensive, simple, and highly reliable method, Provided is a rotating electric machine including: a stator; a rotor that is rotatably arranged with an intermediation of an air gap in a rotating shaft direction with respect to the stator; and a primary-side mechanism that rotates concentrically with a shaft center of the rotor. The primary-side mechanism includes: a fixed position rotating pulley that is arranged so as to be immovable in the rotating shaft direction; and a variable position rotating pulley that is arranged so as to be movable in the rotating shaft direction with respect to the fixed position rotating pulley. The variable position rotating pulley rotates and moves in an axial direction integrally with the rotor.
    Type: Application
    Filed: October 20, 2014
    Publication date: April 23, 2015
    Applicant: NIPPON PISTON RING CO., LTD
    Inventors: Masafumi SAKAMOTO, Shigeyoshi SATO, Shunsuke TAKEGUCHI
  • Publication number: 20150075886
    Abstract: An electric rotating machine includes a power transmission mechanism and an armature. The power transmission mechanism is equipped with a first, a second, and a third rotor. The first rotor includes n soft-magnetic members. The second rotor includes k soft-magnetic members. Note that n and k are an integer more than one. The third rotor is made up of magnets whose number of pole pairs is m where m is an integer more than or equal to one. The armature faces the third rotor. The first, second, and third rotors are arranged so as to establish a magnetic coupling among them. The soft-magnetic members of the first and second rotors and the magnets of the third rotor meet a relation of 2m=|k±n|. This arrangement is capable of achieving the transmission of power regardless of electric energization of the armature.
    Type: Application
    Filed: September 19, 2014
    Publication date: March 19, 2015
    Inventors: Tatsuya TONARI, Shin KUSASE, Hidenori KATOU, Yousuke KANAME, Naoto SAKURAI
  • Publication number: 20150061419
    Abstract: The utility model discloses an electric heating device with an output greater than an input, including a stator, a rotor, an input controller and a base, characterized in that: the stator is composed of a permanent magnet and an electromagnet, the permanent magnet is disposed externally to the electromagnet. The rotor is composed of a rotor body and a rotor shaft, the rotor body is wholly or partly formed of ferromagnetic material. An end portion at one end of an electromagnet core faces the rotor body and remains a gap with the rotor body. The end portion may be magnetized with an N pole or an S pole under an action of the external permanent magnet. The input controller is connected with an electromagnetic coil. The utility model not only may achieve an output greater than an input, but also may achieve a 100% “output efficiency”.
    Type: Application
    Filed: July 31, 2014
    Publication date: March 5, 2015
    Inventor: Yangyuan LI
  • Publication number: 20150002063
    Abstract: An exterior rotor switched reluctance machine includes a stator, a rotor adjacent the stator and adjacent a housing, the housing connected to the stator. The stator further includes a back iron, a set of stator poles connected to the back iron and a set of windings disposed between the set of stator poles. The rotor, connected to a shaft and rotatively coupled to the stator, further includes a set of rotor segments. The set of windings includes a set of phases, each phase experiencing a flux linkage that varies with an angular position of the rotor. The apparatus operates as a motor in response to selectively energizing the set of phases with a set of current pulses. The apparatus operates as a generator in response to rotating the shaft.
    Type: Application
    Filed: June 27, 2014
    Publication date: January 1, 2015
    Applicant: The Board of Regents, The University of Texas System
    Inventors: Babak Fahimi, Wei Wang, Chenjie Lin
  • Publication number: 20140333159
    Abstract: A stepper motor is provided in which a permanent ring magnet is sandwiched in an outer part of the stator winding assembly located far from the gap between rotor and stator teeth, so that magnetic flux in the gap is dominated by the Ampere-turns of energized stator coils and therefore more easily controlled for reduced vibration at low stepping speeds. The rotor need not contain any permanent disk magnet. If one is provided, it can be completely embedded within the rotor and merely supplement the primary flux from the stator to enhance torque. In most cases, where the rotor lacks any permanent magnet, the motor's axial shaft can have a larger diameter and may, together with the rotor, form a linear actuator.
    Type: Application
    Filed: May 9, 2013
    Publication date: November 13, 2014
    Inventor: Ted T. Lin
  • Patent number: 8810347
    Abstract: A method of activating an electric machine having a stator, and a rotor which rotates about an axis with respect to the stator; the stator having a plurality of stator segments arranged about the axis; the rotor having modules made of magnetizable material and arranged about the axis; and the method including the steps of connecting the rotor to the stator by means of a bearing; and magnetizing the modules of magnetizable material when the rotor is connected to the stator.
    Type: Grant
    Filed: December 18, 2012
    Date of Patent: August 19, 2014
    Assignee: Wilic S.AR.L
    Inventors: Thomas Kaessner, Alessandro Fasolo
  • Publication number: 20140217838
    Abstract: A magnetic gear arrangement is provided having a magnetically active gear member that generates a first magnetic field, which is modulated by interpoles. The modulated magnetic field generates magnetic poles on a magnetically passive gear member, and these poles form a second magnetic field. The material of the passive gear member is sufficiently magnetically hard that the first and second magnetic fields interact to couple the motion of the active and passive gear members according to a given gear ratio.
    Type: Application
    Filed: April 11, 2014
    Publication date: August 7, 2014
    Applicant: ROLLS-ROYCE PLC
    Inventor: Christopher G. BRIGHT
  • Patent number: 8736136
    Abstract: A switched reluctance motor includes a stator and a rotor, the stator having stator poles supporting a magnetic field focusing device such as a near field plates on each stator pole tip. An example near field plate has a spatially modulated surface reactance configured so as to focus magnetic flux extending from each pole tip within at least one region of increased magnetic field proximate the pole tip.
    Type: Grant
    Filed: February 16, 2011
    Date of Patent: May 27, 2014
    Assignee: Toyota Motor Engineering & Manufacturing North America, Inc.
    Inventors: Jaewook Lee, Ercan Mehmet Dede, Debasish Banerjee, Hideo Iizuka
  • Publication number: 20140117791
    Abstract: An assembly includes multiple adjoined rotor sections each having multiple poles and multiple void rows therethrough that are radially distributed in each of the poles. The rotor sections are skewed in a circumferential direction. The assembly also has multiple conductive rings that substantially surround one of the void rows. A method of assembly and electric machines and vehicles using the assembly are also disclosed. Aspects reduce torque ripple in electric machines and allow for encoderless/sensorless operation in an electric machine using the rotor assembly. The present invention has been described in terms of specific embodiment(s), and it is recognized that equivalents, alternatives, and modifications, aside from those expressly stated, are possible and within the scope of the appending claims.
    Type: Application
    Filed: November 21, 2013
    Publication date: May 1, 2014
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Alexander Felix Fiseni, Kum-Kang Huh, Mohamed Osama, Francesco Papini
  • Publication number: 20140062226
    Abstract: Disclosed herein is a switched reluctance motor assembly including: a shaft forming the center of rotation of a motor; a rotor part rotatably coupled to the shaft; a balancing member including the rotor part and formed so as to enclose the shaft; a sensor magnet coupled to a lower end portion of the balancing member in an axial direction; and a printed circuit board having a hall sensor attached thereto so as to face the sensor magnet at a lower portion of the sensor magnet in the axial direction. According to the present invention, the coupling precision of the sensor magnet for sensing the position of the rotor part forming the rotor of the switched reluctance motor assembly may be improved.
    Type: Application
    Filed: January 9, 2013
    Publication date: March 6, 2014
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventors: Yong Wan Cho, Sang Ho Seo, Myung Geun Oh, Sung Tai Jung, Jung Kyu Yim
  • Publication number: 20130320783
    Abstract: A step motor used to adjust a headlight's up and down includes a supporting pole, a magnet, a coil and a circuit board. The circuit board has a power input terminal subsequently connected with a voltage regulator IC, a control IC, a transistor and a driver. In addition, the driver is connected with the coil; the control IC is connected with a signal input terminal further connected with a vehicle compute; the power input terminal is connected with a vehicle power source. So when a vehicle is started, power can flow through and regulated by the voltage regulator IC. Then it runs through the control IC to command the driver to drive the negative coil to induce the magnet to rotate clockwise or counterclockwise, enabling the supporting pole to move inward or outward to horizontally balance the headlight.
    Type: Application
    Filed: June 4, 2012
    Publication date: December 5, 2013
    Inventors: Hsiu-Ming Huang, Hsian-Yi Huang
  • Patent number: 8582191
    Abstract: Implementations of actuators and capacitor-based position sensors for monitoring and controlling positioning of the actuators are provided, including implementations of actuators that use flexures to provide support to actuators and pivoting mechanisms to the actuators. Such actuators can be electromagnetically activated actuators that include a magnet stator and a coil rotor mounted on a flexure. A positioning sensor, such as a capacitor sensor, is provided to measure and monitor positioning of the actuator and is coupled to a feedback circuit which uses the measured positioning of the actuator to control the actuator.
    Type: Grant
    Filed: September 25, 2012
    Date of Patent: November 12, 2013
    Assignee: Prysm, Inc.
    Inventors: Bruce Borchers, Robert Stark
  • Patent number: 8569922
    Abstract: A novel electric motor rotor structure, particularly desirable for use with brittle rare-earth-magnets, offers improved resistance to rattling and axial shifting. This is achieved by forming the rotor with an annular central yoke connecting to a plurality of pole shoes along the periphery of the rotor and defining a magnet-receiving recess or pocket 160 between each pole shoe and the central yoke. Spaced circumferentially between adjacent magnets 38 are regions 146 of reduced magnetic conductivity, which include relatively thin metallic holding segments, which connect adjacent pole shoes to each other and to the central yoke. During manufacturing, tools are applied to upset or crimp the holding segments, and thereby form spring elements, to hold the magnets in stable positions and resist any tendency of the magnets to rattle or axially shift during motor operation. One obtains the same power level from a smaller, and therefore lighter, motor than was previously possible.
    Type: Grant
    Filed: June 1, 2011
    Date of Patent: October 29, 2013
    Assignee: EBM-Papst St. Georgen GmbH & Co. KG
    Inventor: Volker Rombach
  • Publication number: 20130221889
    Abstract: Disclosed herein is a multi-phase switched reluctance motor apparatus including: a multi-phase switched reluctance motor; a position sensing sensor provided at one side of the multi-phase switched reluctance motor; and a controller connected to the multi-phase switched reluctance motor and the position sensing sensor and controlling power in a multi-phase excitation scheme according to a detection angle of the position sensing sensor to supply the power to the multi-phase switched reluctance motor. The multi-phase switched reluctance motor may generate a reluctance torque while reducing torque pulsation, noise, and vibration.
    Type: Application
    Filed: February 22, 2013
    Publication date: August 29, 2013
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventor: Samsung Electro-Mechanics Co., Ltd.
  • Publication number: 20130207490
    Abstract: An integrated starter generator device comprising a housing, a stator and a rotor contained within the housing, the device further comprising control electronics operable to configure the device as either a starter or generator and contained entirely within the housing. The device may include a high current terminal having brass and rubber bonded together. The rubber forms both a sealing and an insulating function.
    Type: Application
    Filed: September 16, 2009
    Publication date: August 15, 2013
    Applicant: Controlled Power Technologies, Ltd.
    Inventors: Tim Spearman, Mike Dowsett, Toby Heason, Wayne Maddison, Mike Dowsett, Toby Heason, Stephen Knight
  • Publication number: 20130175891
    Abstract: Disclosed herein is a switched reluctance motor including: a rotor part including a rotor core of which a shaft is fixedly coupled to a central portion and a plurality of rotor poles protruding from the rotor core; a stator part including a stator yoke rotatably receiving the rotor part therein and a plurality of stator salient poles protruding from the stator yoke so as to face the rotor poles; and auxiliary rotor poles coupled to outer portions of the rotor poles to rotate integrally with the rotor part.
    Type: Application
    Filed: December 13, 2012
    Publication date: July 11, 2013
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventor: SAMSUNG ELECTRO-MECHANICS CO., LTD.
  • Publication number: 20130082548
    Abstract: Disclosed herein is a switched reluctance motor in which a position detection part capable of detecting a rotational position of the rotor part is formed in a balancing member coupled to a rotor part and a sensor part is positioned at a position corresponding to that of the position detection part and on a cover surface of an inner side of the motor housing. According to a preferred embodiment of the present invention, the sensor part is positioned in the motor housing, thereby making it possible to protect the sensor part and improve reliability in sensing of a rotational position of the rotor part by the sensor part.
    Type: Application
    Filed: June 12, 2012
    Publication date: April 4, 2013
    Applicant: Samsung Electro-Mechanics Co., Ltd.
    Inventors: Hyung Joon Kim, Han Kyung Bae, Jin Wook Baek, Se Joo Kim, Tae Ho Yun, Hong Chul Shin
  • Publication number: 20130076164
    Abstract: Disclosed herein is a switched reluctance motor including: a rotor part including a rotor core having a shaft fixedly coupled to the center thereof and a plurality of rotor poles formed to be protruded from the rotor core; a stator part having the rotor part rotatably received therein and a plurality of stator salient poles formed to be protruded from the stator yoke; a balancing part selectively coupled to an upper portion or a lower portion of the rotor part and having a plurality of sensing grooves formed in an outer peripheral surface thereof; a motor housing provided with an opening part through which the shaft penetrates; and a position detecting unit disposed between the rotor part and the stator part and coupled to an inner portion of the motor housing.
    Type: Application
    Filed: September 26, 2012
    Publication date: March 28, 2013
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventor: SAMSUNG ELECTRO-MECHANICS CO., LTD.
  • Patent number: 8358189
    Abstract: A method of activating an electric machine having a stator, and a rotor which rotates about an axis with respect to the stator; the stator having a plurality of stator segments arranged about the axis; the rotor having modules made of magnetizable material and arranged about the axis; and the method including the steps of connecting the rotor to the stator by means of a bearing; and magnetizing the modules of magnetizable material when the rotor is connected to the stator.
    Type: Grant
    Filed: August 6, 2010
    Date of Patent: January 22, 2013
    Assignee: Willic S.AR.L.
    Inventors: Thomas Kaessner, Alessandro Fasolo
  • Publication number: 20120280580
    Abstract: Cooling apparatus and methods for a fractional-horsepower motor. Motor cooling apparatus includes a heat shoe, a heat diffuser, and a heat pipe coupled therebetween. The heat shoe is configured to partially cover a portion of, and to receive motor thermal energy from, the motor. The heat pipe is coupled to the heat shoe, and is configured to convey the motor thermal energy from the heat shoe. Heat diffuser can be coupled to receive motor thermal energy from the heat pipe. It is configured to diffuse at least a portion of the motor thermal energy into an ambient atmosphere. A thermal sensor is coupled to the motor and configured to sense a motor thermal condition; and a fan can be coupled to the thermal sensor through a controller. The controller is configured to control the speed of the fan relative to the motor thermal condition sensed by the thermal sensor.
    Type: Application
    Filed: May 4, 2011
    Publication date: November 8, 2012
    Applicant: Aurora Office Equipment Co., Ltd. Shanghai
    Inventors: Yung Kang Tso, Guang Long Chen
  • Publication number: 20120161552
    Abstract: A stepping motor for a meter to rotate a pointer of a meter, the stepping motor for a meter includes: a rotor part having: a cylindrical magnet; and a rotational shaft, which is hollow and made of a resin, and which is molded on an inner periphery of the cylindrical magnet and is coaxial with the cylindrical magnet; a stator part that contains the rotor part therein and has an excitation coil; a front plate made of a resin, and an end plate made of a resin, wherein a fixing part to fix the cylindrical magnet is molded when molding the rotational shaft, and wherein the cylindrical magnet is fixed by the fixing part so that the cylindrical magnet and the rotational shaft are integrated.
    Type: Application
    Filed: December 6, 2011
    Publication date: June 28, 2012
    Applicant: MINEBEA MOTOR MANUFACTURING CORPORATION
    Inventors: Shoji YOSHITOMI, Katsutoshi SUZUKI, Masatomo KOMAKI
  • Publication number: 20120139368
    Abstract: Electric motor cluster consisting of several stator sections each possessing a minimum of two salient pole projections, wound with power windings, and each section containing a single rotor. Each individual motor is angularly displaced one from the other, while mounted within a common housing, and geared together such that each motor section contributes to the rotation of a common output shaft. Each motor comprises at least one stator and one rotor section, such that each rotor section is associated with a specific stator section. The lateral axis of each rotor section is disposed at an oblique angle with respect to the axis of the shaft for that particular motor.
    Type: Application
    Filed: August 12, 2010
    Publication date: June 7, 2012
    Applicant: CONVERGENT POWER, INC.
    Inventor: James F. Murray, III
  • Publication number: 20120126640
    Abstract: A rotary actuator includes a stator on which a sensor surface is arranged and a rotor configured to rotate about the stator. The rotor forms an actuating surface for the sensor surface. An interval fixing device such as a rotationally fixed sliding disk is arranged between the actuating surface and the sensor surface. A spring is configured to press the sensor surface towards the actuating surface.
    Type: Application
    Filed: February 6, 2012
    Publication date: May 24, 2012
    Applicant: LEOPOLD KOSTAL GMBH & CO. KG
    Inventors: Michael Bleckmann, Uwe Borgmann
  • Publication number: 20120068559
    Abstract: A apparatus is provided in which, in a state before being assembled to a drive target, one end of a rotating shaft is not supported by a bearing, and in this state, the rotating shaft is pressed to the side of a bracket by coil springs and thus centering of the rotating shaft is maintained. In this way, axial run-out of the rotating shaft before a magnetic motor is assembled to the drive target is inhibited. Thus, damage and deterioration in assembly efficiency as a result of axial run-out of the rotating shaft can be inhibited, such as deterioration in assembly efficiency caused by adhesion between a magnet and coils wound on an armature core, for example.
    Type: Application
    Filed: September 16, 2011
    Publication date: March 22, 2012
    Applicants: DENSO CORPORATION, ADVICS CO., LTD.
    Inventors: Yuki NAKAMURA, Kunihito Ando, Nobuhiko Yoshioka, Takahiro Naganuma, Tomoaki Kawabata
  • Patent number: 8130436
    Abstract: Implementations of actuators that use flexures to provide support to the actuators and pivoting mechanisms to the actuators. Such actuators can be electromagnetically activated actuators that include a magnet stator and a coil rotor mounted on a flexure.
    Type: Grant
    Filed: February 17, 2009
    Date of Patent: March 6, 2012
    Assignee: Prysm, Inc.
    Inventor: Bruce Borchers
  • Publication number: 20110235210
    Abstract: A spindle motor for use in a disk drive apparatus includes stationary and rotating portions. The stationary portion includes a shaft including a thrust plate. A sleeve portion includes an axial end surface arranged opposite the thrust plate. A first seal member is arranged opposite the thrust plate on an opposite side with respect to the sleeve portion. The thrust plate preferably includes a plate communicating hole arranged to connect first and second thrust gaps defined, respectively, between the thrust plate and the sleeve portion and between the thrust plate and the first seal member. The sleeve portion preferably includes a sleeve communicating hole arranged to connect the first thrust gap with an opposite axial side thereof. A lubricant is arranged to fill a communicating channel extending from a first to a second capillary seal portion through the plate communicating hole and the sleeve communicating hole.
    Type: Application
    Filed: March 28, 2011
    Publication date: September 29, 2011
    Applicant: NIDEC CORPORATION
    Inventors: Toshikazu HIMENO, Shozo TAGATA, Shinya YANO, Wataru YAMAUCHI, Akihiro YUDATE
  • Publication number: 20110202940
    Abstract: A motor includes a turntable and a rotor holder unified with each other by insert-molding. The turntable includes a protrusion portion protruding radially outward beyond a cylinder portion and a substantially cylindrical covering portion extending downward from an radial inner end of the protrusion portion to cover an outer circumferential surface of the cylinder portion. The rotor holder has a radial outer end portion arranged in the same radial position as an outer circumferential surface of the covering portion or arranged radially inward of the outer circumferential surface of the covering portion. For this reason, a sliding contact area between a mold and the rotor holder is reduced. This helps suppress sliding contact between the mold and the rotor holder during a mold releasing process, consequently suppressing degradation of the mold.
    Type: Application
    Filed: February 14, 2011
    Publication date: August 18, 2011
    Applicant: NIDEC CORPORATION
    Inventors: Haruhiko Ito, Takuya Yamane
  • Publication number: 20110140549
    Abstract: A linear actuator, in particular for adjusting the flaps in motor vehicle turbochargers. The linear actuator has an adjusting element that can be linearly displaced by an electric motor. The electric motor is a two-phase transverse flux machine. A rotor is arranged between two opposite single-phase stators, and the rotor is connected in a rotationally fixed manner to a rotatable and linearly stationary rotational element that engages with the linearly movable adjusting element in order to cause a linear movement of the adjusting element when the rotational element is rotated.
    Type: Application
    Filed: June 16, 2009
    Publication date: June 16, 2011
    Applicant: SCHAEFFLER TECHNOLOGIES GMBH & CO. KG
    Inventor: Wolfgang Hill
  • Publication number: 20110062805
    Abstract: A variable reluctance machine is disclosed, such as a switched reluctance machine, the machine having a rotor, a stator, a housing, and a magnetic eddy current dampening component disposed between stator and housing. The magnetic eddy current dampening component not only reduces the eddy current's impact on surrounding electronics, it also assists in increasing the efficiency of the switched reluctance machine.
    Type: Application
    Filed: September 17, 2009
    Publication date: March 17, 2011
    Applicant: Caterpillar Inc.
    Inventor: Satish D. Savant
  • Publication number: 20110031824
    Abstract: The invention relates to a gear motor including a multiple-phase electric motor formed by a stator portion excited by electric coils and by a rotor having N pairs of poles radially magnetised in alternating directions, the stator portion including two angular sectors alpha-1 and alpha-2 with respective radii R1 and R2, comprising wide teeth and narrow teeth radially extending from an annular crown, characterised in that the wide teeth have a width higher than or equal to twice the width of the narrow teeth, in that the notch width is higher than the width of a narrow tooth, in that the angular sector alpha-1 is lower than 220° and includes all the coils, and in that the ratio R1/R2 ranges from 1.2 to 2.
    Type: Application
    Filed: July 11, 2008
    Publication date: February 10, 2011
    Applicant: Moving Magnet Technologies
    Inventor: Daniel Prudham
  • Publication number: 20110006620
    Abstract: A stator 3 is provided with a plurality of magnetic poles 3a on the outer circumference thereof, and is configured from a plurality of layers of plate-shaped members. A rotor 4 is rotatably disposed around the stator. The inner circumferential face of the rotor is provided with a magnet 5. The outer circumferential ends of the magnetic poles of the stator are provided with an extended portion that is bent such that at least one plate-shaped member, including an outermost layer, of the plurality of plate-shaped members is substantially parallel to the magnet. When the inner diameter of a bent portion of a plate-shaped member that is the closest to the magnet of the at least one plate-shaped member constituting the extended portion is taken as R1i, and the thickness of the closest plate-shaped member is taken as T1, R1i<T1 is satisfied. Accordingly, it is possible to improve the driving efficiency of an outer rotor-type motor.
    Type: Application
    Filed: June 30, 2010
    Publication date: January 13, 2011
    Applicant: PANASONIC CORPORATION
    Inventors: Hiroaki KAWASAKI, Yuichi YOSHIKAWA, Atsuyoshi KOSHIBA, Koji KADOWAKI, Yasuo KUNISHIGE, Yasuhiro INOUE
  • Publication number: 20100219704
    Abstract: A speed-variable single phase induction motor. By a plurality of stators disposed with an interval therebetween and a plurality of magnetic rotors corresponding to the respective stators, the motor implements a high efficiency and a speed-variable performance such as a brushless direct current (BLDC) motor with a low cost without using an expensive inverter driving apparatus.
    Type: Application
    Filed: January 23, 2007
    Publication date: September 2, 2010
    Applicant: ELECTRONICS INC.
    Inventors: Seung-Do Han, Hyoun-Jeong Shin
  • Publication number: 20090232664
    Abstract: A subsea pump drive employs a permanent magnet (PM) motor to drive a subsea pump. The PM motor rotor in one embodiment is canned with a non-magnetic material such as inconel that can provide a desired level of corrosion protection. The PM motor provides a subsea pump drive that is smaller and more efficient, having a high power factor than a subsea pump drive utilizing a conventional induction motor. The PM motor subsea pump drive eliminates the necessity for a topside storage tank and associated fluid transfer lines when the motor rotor is cooled with processed fluid.
    Type: Application
    Filed: March 12, 2008
    Publication date: September 17, 2009
    Applicant: General Electric
    Inventors: Ronghai Qu, Vasanth Kumar Srinivasa Kothnur, Xianghui Huang
  • Publication number: 20090142208
    Abstract: The present invention comprehends a gerotor or gear pump driven by a permanent magnet motor which exhibits cogging torque, i.e., resistance to rotation when de-energized caused by interaction between permanent magnets in the rotor and teeth on the stator. Such interaction causes the rotor to come to rest in one of many defined rotational positions and resist rotation when electrical power to the motor has been terminated. The permanent magnet motor is coupled, preferably directly, to a gerotor pump having meshing rotors or a gear pump having meshing gears. When the motor is de-energized, the pump rotors or gears come to rest and their rotation is resisted by the cogging torque of the motor. The invention finds particular application in automotive transmissions and systems with parallel pumps.
    Type: Application
    Filed: May 15, 2008
    Publication date: June 4, 2009
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
    Inventors: Robert E. Rhein, Todd A. Frerichs, Peter Bostwick
  • Publication number: 20090134723
    Abstract: The electric motor device is provided. The electric motor device includes: a first drive member that has a plurality of permanent magnets; a second drive member that has a plurality of electromagnetic coils; and a clearance controller that shifts at least either one of the first drive member and the second drive member, thereby changing a size of a clearance formed between the first drive member and the second drive member.
    Type: Application
    Filed: November 14, 2008
    Publication date: May 28, 2009
    Applicant: SEIKO EPSON CORPORATION
    Inventor: Kesatoshi Takeuchi
  • Publication number: 20090134722
    Abstract: The invention disclosed is a magnet engine, more specifically an engine that derives its power from the power contained in a magnet (22) and employs a cam or barrel drive mechanism (28) to translate the power in the magnet (22) into useful power output. The magnet engine is comprised generally of one or more in-line reciprocating magnet (22) and piston (20) component pairs arranged circularly around and parallel to a central axis, one or more variable magnetic field conductors (23) positioned generally between and generally equidistant from each of the magnet (22) and piston (20) components, in a magnet (22) and piston (20) component pair, that effect a reciprocating motion in the magnet (22) and piston (20) components, and one or more cam drives (28), positioned concentric to the magnet (22) and piston (20) component pairs, that are employed to translate the reciprocating motion of the magnet (22) and piston (20) component pairs into rotary motion.
    Type: Application
    Filed: November 23, 2007
    Publication date: May 28, 2009
    Inventor: Henry Robert Gasull, III
  • Publication number: 20090066173
    Abstract: To enable control the number of revolutions of a wheel with a new structure different from an induction motor and adjust the maximum torque rapidly and accurately. A linear drive travel system includes a metal wheel 20 having a drum rotor and a stator 30 arranged inside the metal wheel 20. The stator 30 includes a plurality of rows of electromagnets 32 arranged in the direction of rotation axis, each row being formed of a plurality of electromagnets 32 arranged along the circumference around a rotary shaft 40. A drum rotor includes a plurality of arc-shaped rotor cores 23 arranged along the circumference around the rotary shaft 40. Control means (control system 80) performs control by allowing electromagnets 32 in some rows to be a magnetization coil of the rotor core and by allowing the electromagnets 32 in other rows to be a rotation coil of the drum motor.
    Type: Application
    Filed: March 12, 2007
    Publication date: March 12, 2009
    Inventors: Sachio Takahashi, Kazuo Fuda
  • Publication number: 20090009011
    Abstract: A motor is disclosed comprising: at least one stator comprising a magnetic core and at least one magnetic winding, having a cylindrical internal cavity; at least one cylindrical rotor inside said stator, comprising magnetically conductive materials; said rotor having an outer diameter significantly smaller than the inner diameter of said stator, being eccentrically mounted with respect to said stator and able to move within, said fixed member; wherein magnetic normal force is induced in said stator periodically, whereby said rotor is periodically moved by magnetic force with respect to said stator, whereby rotary motion is produced; said motor further having: an output shaft concentric with said stator; transmission means for absorbing oscillation and transmitting rotation; wherein said induced magnetic normal force rotates around the circumference of said stator, such that a contact patch between said rotor and said stator rotates around the inner circumference of said stator; whereby said rotor oscillates a
    Type: Application
    Filed: September 11, 2008
    Publication date: January 8, 2009
    Inventors: Jonathan Sidney Edelson, Hans Juergen Walitzki
  • Publication number: 20080238220
    Abstract: A permanent magnet (PM) machine has a reconfigurable fault condition mechanism disposed solely within a stator core portion, wherein the mechanism is automatically reconfigurable to reduce fault currents associated with the PM machine during a fault condition. The reconfigurable fault condition mechanism is automatically reconfigurable to also reduce internal heat associated with the PM machine during a fault condition. A method of reconfiguring the fault condition mechanism upon detection of a fault condition includes the steps of 1) selecting the reconfigurable fault condition mechanism from a) a plurality of rotatable magnetically anisotropic cylinders disposed within stator core slots, b) a plurality of ferrofluid-fillable cavities associated with stator core slots, and c) a sliding shield within the stator core; and 2) reconfiguring the fault condition mechanism to automatically reduce fault currents associated with the PM machine upon detection of a fault condition.
    Type: Application
    Filed: March 28, 2007
    Publication date: October 2, 2008
    Inventors: Ayman Mohamed Fawzi El-Rafaie, John Michael Kern, Manoj Ramprasad Shah
  • Publication number: 20080179999
    Abstract: A motor drive system 10-1 for a railway vehicle is capable of reducing the weight of wiring, electromagnetic noise, and manufacturing cost. The motor drive system includes an inverter 11. The inverter is configured to control a motor 13-1 and is divided into at least two separate inverter units that are arranged integrally with the motor.
    Type: Application
    Filed: December 18, 2007
    Publication date: July 31, 2008
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yosuke NAKAZAWA, Shinichi Noda, Kazuaki Yuuki, Kazuaki Fukuda
  • Publication number: 20080178589
    Abstract: The present invention provides a heat-pipe generator. The blade is assembled into the heat pipe, a magnetic rotor is arranged around the blade, and generating coils are assembled externally onto the heat pipe opposite to the magnetic rotor. When the working liquid within the heat pipe is evaporated into vapor to drive the blade and the magnetic rotor, the generating coil outside of the heat pipe will yield inductive power, thus maintaining a vacuum state in the heat pipe for heat conduction. The magnetic rotor and generating coils may generate power accordingly.
    Type: Application
    Filed: May 18, 2007
    Publication date: July 31, 2008
    Applicant: FORCECON TECHNOLOGY Co., Ltd.
    Inventors: Sin-Wei He, Te-Chang Chou, Liang-Sheng Chang, Chin-Ching Ku
  • Publication number: 20080164778
    Abstract: A magnetic motor which includes an elongated, horizontally disposed frame having a drive shaft rotatably mounted therein with the drive shaft being supported at its opposite ends by titanium bearing blocks. Opposing first and second slide panels having bar magnets at the inner surfaces thereof are movably mounted on the frame and are movable towards the drive shaft which has magnets mounted thereon in a helical fashion. As the slide panels with the magnets thereon are moved towards the drive shaft, the magnets on the slide panels will cause the magnets on the drive shaft to be repelled thereby causing the rotation of the drive shaft. Movement of the slide panels is controlled by actuators.
    Type: Application
    Filed: November 27, 2007
    Publication date: July 10, 2008
    Inventor: Steven James Schieffer
  • Publication number: 20030184166
    Abstract: The objects of the present invention is to provide a stepping motors capable of rotating with not only high speed but also less undesired vibration and noises, and moreover enabling a simpler, smaller manufacturing equipment thereof to be constructed.
    Type: Application
    Filed: March 24, 2003
    Publication date: October 2, 2003
    Applicant: MINEBEA CO., LTD.
    Inventors: Soichi Kurosawa, Akio Kanazawa, Naohiro Yoshida
  • Patent number: 6470918
    Abstract: A yarn processing system which includes a yarn feeding device and an accessory device associated with the yarn feeding device. The accessory device has a device which is driven using a signal representing the rotational speed of a component of the yarn feeding device. The signal is generated by an electronic sensor galvanically separated from the control system and the drive mechanism of the yarn feeding device. The sensor also is structurally independent from the yarn feeding device. The sensor is located at or close to the yarn feeding device at a mounting location where a part of a rotating magnetic field is detected by the sensor at the mounting location. The part of the magnetic field originating from inside of the yarn feeding device is not used for the operation of the yarn feeding device at the mounting location of the sensor.
    Type: Grant
    Filed: June 11, 2001
    Date of Patent: October 29, 2002
    Assignee: Iro Patent AG
    Inventors: Fiorenzo Ghiardo, Lars Helge Gottfrid Tholander
  • Patent number: 6184640
    Abstract: A turbomolecular pump device having a DC brushless motor provided with a simplified rpm detection mechanism is provided. A pickup coil for detecting a magnetic flux produced by a permanent magnet of the DC brushless motor is built in the motor. Namely, a small size, low cost, simple and strong pickup coil is disposed in a space between the permanent magnet (rotor) of the DC brushless motor and the motor drive coil (stator coil). The magnetic flux produced by the permanent magnet in the pickup coil is detected. This is converted into an rpm signal of the DC brushless motor by a sequence controlling circuit. It is supervised whether or not the overspeed is performed. Then, when the overspeed is detected, an interruption command is fed to the power source breaker so that the supply of the power is forcibly interrupted to thereby stop the DC brushless motor.
    Type: Grant
    Filed: April 26, 1999
    Date of Patent: February 6, 2001
    Assignee: Seiko Seiki Kabushiki Kaisha
    Inventor: Toshiaki Kawashima