Inductor Type Patents (Class 310/155)
  • Patent number: 10680479
    Abstract: An axial field rotary energy device can include a rotor having an axis of rotation and a magnet; a stator coaxial with the rotor, the stator can have a printed circuit board (PCB) having a plurality of PCB layers that are spaced apart in an axial direction, each PCB layer can include a coil having only two terminals for electrical connections, each coil is continuous and uninterrupted between its only two terminals, each coil consists of a single electrical phase, and one of the two terminals of each coil is electrically coupled to another coil with a via to define a coil pair; and each coil pair is electrically coupled to another coil pair with another via.
    Type: Grant
    Filed: October 25, 2018
    Date of Patent: June 9, 2020
    Assignee: Infinitum Electric, Inc.
    Inventors: Bernhard L. Schuler, Rich Lee, Jorgen Rasmussen
  • Patent number: 10584416
    Abstract: A substrate processing apparatus includes a mounting stand installed to rotate about a rotation shaft extending along a rotary shaft of a rotary table and configured to hold a substrate, and a magnetic gear mechanism including a driven gear configured to rotate the mounting stand about the rotation shaft and a driving gear configured to drive the driven gear. The driven gear is connected to the mounting stand via the rotation shaft and installed to rotate in such a direction as to rotate the mounting stand. The driving gear is disposed in a state in which the driving surface faces the driven surface passing through a predetermined position on a movement orbit of the driven gear moving along with the rotation of the rotary table.
    Type: Grant
    Filed: January 31, 2017
    Date of Patent: March 10, 2020
    Assignee: TOKYO ELECTRON LIMITED
    Inventors: Hitoshi Kato, Yukio Ohizumi, Manabu Honma, Takeshi Kobayashi
  • Patent number: 10495659
    Abstract: A sensor system includes a drum, a first sensor, and a second sensor. The drum is mounted for rotation about a rotation axis and includes a band and a plurality of members that extend axially away from the band. The first sensor and the second sensor are configured to generate electrical output in response to detecting one or more of the plurality of members.
    Type: Grant
    Filed: November 6, 2017
    Date of Patent: December 3, 2019
    Assignee: Rolls-Royce Corporation
    Inventors: John J. Costello, Andrew C. Pickard
  • Patent number: 10365292
    Abstract: A speed sensor system for measuring rotational speed includes a magnetic sensor and a cylindrical drum rotatable around the magnetic sensor. The cylindrical drum includes several axially extending members disposed circumferentially around a first edge of the cylindrical drum. The magnetic sensor is configured to generate an electrical output that indicates each passage of each of the axially extending members around the magnetic sensor as the cylindrical drum rotates around the magnetic sensor. The axially extending members are adapted to deflect radially outwards away from the magnetic sensor in response to an increased rotational speed of the cylindrical drum. The deflection of the axially extending members provides voltage regulation functionality that maintains voltage outputs of the magnetic sensor within a desired operational range.
    Type: Grant
    Filed: April 29, 2016
    Date of Patent: July 30, 2019
    Assignee: Rolls-Royce Corporation
    Inventors: Andrew C. Pickard, John J. Costello
  • Patent number: 10340778
    Abstract: A parallel magnetic circuit motor includes a rotor without magnets and a stator with magnets. The rotor, stator and windings are configured to produce unidirectional current and torque with electrically independent phases.
    Type: Grant
    Filed: October 19, 2010
    Date of Patent: July 2, 2019
    Assignee: QM Power, Inc.
    Inventor: Charles J. Flynn
  • Patent number: 10270306
    Abstract: A motor includes a stator, a rotor, and a case. The stator includes a stator core and windings. The rotor is provided inside the stator. The rotor includes first and second rotor cores and a field magnet. The first and second rotor cores each includes a core base and claw-shaped magnetic poles. The core bases are opposed to each other and the claw-shaped magnetic poles of the first and second rotor cores are alternately disposed in a circumferential direction. The field magnet is disposed between the core bases in the axial direction. The field magnet is magnetized in the axial direction so as to cause the claw-shaped magnetic poles of the first rotor core and the second rotor core to function respectively as first magnetic poles and second magnetic poles. At least part of an end part of the case in the axial direction is made of a non-magnetic body.
    Type: Grant
    Filed: January 23, 2015
    Date of Patent: April 23, 2019
    Assignee: Denso Corporation
    Inventors: Yoji Yamada, Takahiro Tsuchiya, Chie Morita
  • Patent number: 10060667
    Abstract: A waste air flow capture system, comprising: a) a cylindrical shroud configured to receive a waste air flow from a waste air flow channel of an HVAC compressor or a heat pump compressor and configured to vent the waste air flow received from the waste air flow channel of an HVAC compressor or a heat pump compressor; b) a first electrical generator configured to generate electricity when a first fan blade assembly rotates relative to the cylindrical shroud and/or a second electrical generator configured to generate electricity when a first fan blade assembly rotates relative to the cylindrical shroud; and d) a first fan blade assembly enclosed by the cylindrical shroud and coupled to the first electrical generator motor on a first side of the first fan blade assembly and coupled to the second electrical generator motor on a second side of the first fan blade assembly.
    Type: Grant
    Filed: May 26, 2016
    Date of Patent: August 28, 2018
    Inventor: Perry Lynn Martens
  • Patent number: 10056858
    Abstract: Apparatus is provided comprising an electrical motor comprising a rotor and a stator, the rotor comprising a plurality of rotor teeth and the stator comprising a plurality of stator teeth. The apparatus has a driver circuit to drive the electrical motor comprising a boost converter comprising a charge storage element and coupled to a first terminal of a coil winding on at least one of the plurality of stator teeth, and a buck converter comprising the same charge storage element and coupled to the same first terminal of the coil winding on the at least one of the plurality of stator teeth. An inductive element of the boost converter and the buck converter is provided by the coil winding of the at least one of the plurality of stator teeth, and the charge storage element is referenced to a supply node for coupling the second terminal of the coil winding to an electrical supply.
    Type: Grant
    Filed: February 3, 2017
    Date of Patent: August 21, 2018
    Assignee: ARM Limited
    Inventor: David Victor Pietromonaco
  • Patent number: 9954474
    Abstract: A driver circuit for driving an electrical motor coil is provided which comprises combined switched inductance boost voltage converter circuitry and switched inductance buck voltage converter circuitry. An input node of the driver circuit is provided to be coupled with the electrical motor coil, which provides the inductive element of both the boost and buck circuitry. Further the boost and buck circuitry share a storage capacitor, which provides the capacitive element of each circuitry, and a voltage developed across the storage capacitor by the boost circuitry forms an input of the switched inductance buck voltage converter circuitry.
    Type: Grant
    Filed: July 14, 2016
    Date of Patent: April 24, 2018
    Assignee: ARM Limited
    Inventor: David Pietromonaco
  • Patent number: 9920620
    Abstract: A well tool can include a magnetic sensor having opposite sides, and a magnetic shield that conducts an undesired magnetic field from one side to the other side of the sensor. Another well tool can include a magnetic sensor in a housing, the sensor having opposite longitudinal sides relative to a housing longitudinal axis, and a magnetic shield interposed between the housing and each of the opposite longitudinal sides of the magnetic sensor. Another well tool can include at least two magnetic sensors, one magnetic sensor sensing a magnetic field oriented orthogonal to the housing longitudinal axis, and another magnetic sensor sensing a magnetic field oriented parallel to the longitudinal axis, and a magnetic shield interposed between a housing and each of opposite longitudinal sides of the magnetic sensors.
    Type: Grant
    Filed: March 24, 2014
    Date of Patent: March 20, 2018
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Zachary R. Murphree, Michael L. Fripp, Zachary W. Walton, Matthew J. Merron
  • Patent number: 9886011
    Abstract: A method of controlling a portable device based on variation of a magnetic field by a detachable pen attached to the portable device and a portable device thereof is provided. The method includes detecting variation of a magnetic field due to at least one of an attaching, a detaching, and a rotation of the pen, determining whether there is a control operation corresponding to the variation of the magnetic field, and performing the control operation corresponding to the variation of the magnetic field when there is the control operation.
    Type: Grant
    Filed: October 22, 2013
    Date of Patent: February 6, 2018
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Hyungjin Park, Hyunju Hong
  • Patent number: 9771104
    Abstract: To provide a torque detection device which allows less deformation of detection coils than in the conventional techniques in axially pressing and holding in yokes, coil bobbins around which the detection coils are wound. A torque sensor includes a pair of coils, coil bobbins around which the coils are respectively wound, yokes which respectively hold the coil bobbins, one yoke cover fitted by pressing into inner diameters of the yokes, and pressing portions which are formed to project radially and outward at a plurality of circumferential positions of a radial outer end portion of respective flange portions of the coil bobbins, and act between the coil bobbins to axially press the coil bobbins during assembly.
    Type: Grant
    Filed: May 9, 2016
    Date of Patent: September 26, 2017
    Assignee: NSK Ltd.
    Inventors: Kazuyuki Hatanaka, Sumio Sugita
  • Patent number: 9668640
    Abstract: An object is to detect the pressing force of a tip driven unit. In the controller 22, a motor control circuit 85, a load change detection unit 86, a moving speed calculation unit 87 that calculates the moving speed of a rotating body 41, a pressing force detection unit 88 that obtains the pressing force of the rotating body 41 based on the moving speed which is calculated, a CPU 89, and an alarm 91 are disposed. The pressing force is obtained based on the cycle of load change by the joint 41a in which a front end and a rear end overlap with each other is formed in the rotating body 41.
    Type: Grant
    Filed: September 27, 2013
    Date of Patent: June 6, 2017
    Assignee: FUJIFILM Corporation
    Inventor: Manabu Miyamoto
  • Patent number: 9502952
    Abstract: A multi-phase motor including a rotor and a stator including at least one core. The stator includes a plurality of phase sections. Each phase section is configured to provide a phase of the multi-phase motor. Each phase section includes at least one of the core(s), at least two ring magnets having polarity facing in a substantially same direction, and a winding between the at least two ring magnets. The winding is configured to be energized to direct flux through the at least one core at a first portion associated with a first one of the ring magnets, and to be differently energized to direct flux through the at least one core at a second portion associated with a second one of the ring magnets.
    Type: Grant
    Filed: March 11, 2013
    Date of Patent: November 22, 2016
    Assignee: Persimmon Technologies, Corp.
    Inventor: Christopher Hofmeister
  • Patent number: 9350216
    Abstract: Absolute multi-turn position sensing integrated within the structure of a hybrid stepper motor implemented by sharing the magnetic structure of the motor with the sensing means. An alternating magnetic field is obtained from a single magnet within the stepper motor rotor by use of alternating flux paths directed to large Barkhausen jump effect sensing elements. Pulses generated from the large Barkhausen sensing are decoded electronically and stored in a non-volatile memory to absolutely locate the motor position within a fraction of 1 electrical cycle of the motor over an arbitrary range. This coarse position sensing can optionally be extended by use of a higher resolution absolute within-electrical-cycle sensing means to provide integrated high resolution position sensing over an arbitrary number of revolutions.
    Type: Grant
    Filed: December 28, 2012
    Date of Patent: May 24, 2016
    Assignee: QuickSilver Controls, Inc.
    Inventor: Donald P. Labriola, II
  • Patent number: 9297635
    Abstract: A magnetic sensor system includes a scale and a magnetic sensor arranged in a relative positional relationship variable in a first direction, and a computing unit. The magnetic sensor includes a first detection circuit disposed at a first position and a second detection circuit disposed at a second position. Each of the first and second detection circuits includes a spin-valve magnetoresistive element. The difference between the first position and the second position in the first direction is smaller than or equal to 1.25% of a one-pitch amount of change in the relative positional relationship between the scale and the magnetic sensor. The computing unit generates an abnormal-event determination signal indicative of the presence of an abnormal event in the magnetic sensor by computation using detection signals from the first and second detection circuits.
    Type: Grant
    Filed: January 27, 2014
    Date of Patent: March 29, 2016
    Assignee: TDK CORPORATION
    Inventors: Homare Tokida, Satoshi Abe, Hiroshi Yamazaki, Takahiro Imai
  • Patent number: 9225205
    Abstract: An electrical rotating machine having a stator or a rotor with a core that includes a plurality of tapered pole pieces is a low loss electrical machine that results in improvements such as higher output power, higher torque and higher efficiency than a machine that does not have tapered pole pieces. The stator or the rotor with tapered pole pieces may be applied to a power train in automobiles, power tools, and various appliances. The core is constructed by winding an iron-based amorphous magnetic alloy ribbon to form a cylinder-shaped core, then heating, impregnating with resin, and machining by cutting the cylinder-shaped core to form a plurality of tapered pole pieces being separated in an alternating manner by a plurality of slots. The cores having an outside diameter of 50 mm-1200 mm, a tapered angle of 10°-45°, and a slot depth of 10 mm-210 mm are advantageous.
    Type: Grant
    Filed: January 25, 2013
    Date of Patent: December 29, 2015
    Assignee: GLASSY METAL TECHNOLOGIES LTD.
    Inventors: John Andrew Gayler, Stephen Robert Kloeden, Nesimi Ertugrul, Ryusuke Hasegawa
  • Patent number: 9110124
    Abstract: A magnetic sensor is provided with a channel of a semiconductor, a first insulating film and a metal body arranged opposite to each other with the channel in between, a ferromagnet provided on the first insulating film, a first reference electrode connected to the metal body, a second reference electrode connected to the metal body, a magnetic shield covering a portion opposed to the ferromagnet in the channel, and a second insulating film provided between the channel and the magnetic shield. The magnetic shield has a through hole extending toward the portion opposed to the ferromagnet in the channel.
    Type: Grant
    Filed: July 1, 2011
    Date of Patent: August 18, 2015
    Assignee: TDK CORPORATION
    Inventors: Tomoyuki Sasaki, Tohru Oikawa
  • Patent number: 9103846
    Abstract: A measuring device for determining an operating state variable of a rotating structural element, in particular a bearing, which has a plurality of components. Specifically, the measuring device has a permanent magnet, an encoder ring for manipulating the magnetic field which is generated by the permanent magnet, a magnetic field sensor, a radio unit for transmitting measurement signals from the magnetic field sensor to an evaluation unit, and an energy converter unit for converting rotation energy into electrical energy. The encoder ring is produced from a ferromagnetic and non-premagnetized material.
    Type: Grant
    Filed: February 7, 2012
    Date of Patent: August 11, 2015
    Assignee: Schaeffler Technologies AG & Co. KG
    Inventors: Christian Mock, Jens Heim, Florian Koeniger
  • Publication number: 20100314961
    Abstract: Disclosed is a magnetic flux switching type electric generator using a shielding member as a permanent magnet in that a magnet is fixed and a shielding member is formed at a passing portion of the magnetic flux, so that the magnetic flux is repeatedly opened and blocked through a continuous revolution or a repeated motion of the shielding member to generate induced electricity, whereby the amount of generation of electric power can be more and more increased.
    Type: Application
    Filed: October 24, 2008
    Publication date: December 16, 2010
    Inventors: Jong-suk An, Byeong-Moon Kim
  • Patent number: 7817062
    Abstract: An operation of drilling an earth borehole uses a drilling rig, a drill string of drill pipes having its generally upper end mechanically coupleable with and suspendable from the drilling rig, a drive string portion of the drill string, mechanically coupleable with the topmost drill pipe of said drill string, and a drive mechanism mechanically coupleable with the drive string for rotating the drive string and the drill string. A system for generating electric power in the region of the drive string includes an electric generator, which includes a rotating generator component mounted on said drive string for rotation therewith and a stationary generator component mounted on a stationary portion of the drilling rig. The rotating generator component produces electric power in the region of the drive string.
    Type: Grant
    Filed: May 25, 2010
    Date of Patent: October 19, 2010
    Assignee: Intelliserv, LLC.
    Inventors: Qiming Li, David Santoso, Mark Sherman, Raghu Madhavan, Randall P. LeBlanc, John A. Thomas, Joseph Montero
  • Patent number: 7737583
    Abstract: A rotor assembly comprising: an inner rotor and an outer rotor for rotating in a magnetic field of a motor, the inner rotor comprising a main inner rotor cavity, and a plurality of first holes being formed between the inner rotor and the outer rotor; two side boards, each side board having a main side board cavity, and being perforated by a plurality of second holes; two damping elements each damping element comprising a main damping element cavity; a plurality of rubber sleeves, each rubber sleeve having a rubber sleeve lip; and a plurality of third holes; an axle; and a plurality of positioning pins.
    Type: Grant
    Filed: August 3, 2008
    Date of Patent: June 15, 2010
    Assignee: Zhongshan Broad-Ocean Motor Co., Ltd.
    Inventor: Ronghua Bi
  • Patent number: 7687950
    Abstract: A downhole source of electrical power for drilling tools is driven by the rotation of a drillstring or, if the drillstring is not rotating, by the rotation of a drilling sub. The source consists of an alternator having a rotor made up of a series of coils that are mounted on, and spaced around the circumference of, a rotating drilling sub, and a stator made up of a multiplicity of permanent magnets also spaced around the circumference of the drilling sub. The stator is mounted on the drilling sub by means of bearings and incorporates a counterweight that holds the rotor relatively stationary with respect to the sub and with respect to the coils, so that rotation of the sub, either by rotation of the drillstring or by rotation of a drill motor in the drilling sub, produces relative rotation of the rotor and stator to generate an AC electrical output.
    Type: Grant
    Filed: November 27, 2007
    Date of Patent: March 30, 2010
    Assignee: Vector Magnetics LLC
    Inventor: Arthur F. Kuckes
  • Publication number: 20090309445
    Abstract: A low torque rotary electric generator includes a rotor, a stator and a housing. The rotor includes a shaft, an inductor retainer, a first set of inductors and a second set of inductors. The first and second set of inductors are retained on each end of the inductor retainer. The shaft is retained in the inductor retainer. The stator preferably includes a first permanent ring magnet, a second permanent ring magnet and a plurality of generator coils. The permanent ring magnets and the plurality of generator coils are retained on an inside perimeter of the housing. The permanent ring magnets are retained adjacent each end of the rotor. Each permanent ring magnet may be replaced with a plurality of individual permanent magnets. Each generator coil is disposed between the first and second inductors. The housing preferably includes a tubular member, a first end cover and a second end cover.
    Type: Application
    Filed: June 12, 2008
    Publication date: December 17, 2009
    Inventor: Daniel L. Quale
  • Patent number: 7514832
    Abstract: An electric motor having a single field rotor wherein the flux within the rotor is generated by magnetic means located at the end regions of the motor housing such that the flux within the motor rotor maintains a constant polarity.
    Type: Grant
    Filed: February 17, 2004
    Date of Patent: April 7, 2009
    Assignee: Tri-Seven Research, Inc.
    Inventors: Gary L. Durham, Harold S. Durham
  • Publication number: 20080169718
    Abstract: A reluctance motor comprises a stator (2) and a rotor (4). The stator (4) consists of a ferromagnetic but not permanent-magnetic material and has stator teeth (6) that are radially directed towards the rotor (4). Two tangentially adjacent stator teeth (6) each define between them one respective stator slot (7) in which a part of a stator winding (8) is arranged. Permanent magnets (10) are arranged on the stator (2) and emit permanent magnetic fields. The permanent magnets (10) are arranged tangentially in the area of the stator slots (7) and their magnetic fields are radially oriented in the same direction. The permanent magnets are associated with flux guiding elements (12) which deflect the permanent magnetic fields emitted by the permanent magnets (10) in such a manner to the stator teeth (6) that the permanent magnetic fields, based on the tangential position, are oriented in the opposite direction relative to each other in the area of the stator teeth (6) and in the area of the stator slots (7).
    Type: Application
    Filed: March 31, 2006
    Publication date: July 17, 2008
    Applicant: Siemens Aktiengesellschaft
    Inventors: Erich Bott, Matthias Braun, Holger Schunk, Rolf Vollmer
  • Patent number: 7296409
    Abstract: A turbocharger comprises a turbine wheel and a compressor wheel mounted to a turbocharger shaft. An electric induction motor is provided for assisting rotation of the compressor wheel in predetermined circumstances. The motor comprises a fixed stator having motor field coils which generate a rotating magnetic field when energised by an AC control signal which induces eddy current flow in a rotor to generate a rotor magnetic field which in turn interacts with the stator magnetic field producing torque in the rotor.
    Type: Grant
    Filed: January 30, 2004
    Date of Patent: November 20, 2007
    Assignee: Holset Engineering Company, Ltd.
    Inventor: Edward Spooner
  • Patent number: 6954014
    Abstract: The invention relates to a motor with a frequency generator attached thereto, equipped with the frequency generator (FG) for detecting a rotational speed of the motor.
    Type: Grant
    Filed: May 13, 2004
    Date of Patent: October 11, 2005
    Assignee: Japan Servo Co., Ltd.
    Inventors: Shoji Ohiwa, Yuji Enomoto, Tomoyoshi Maruyama, Yuji Takagai, Sachio Hatori, Kazuto Nagai
  • Patent number: 6894484
    Abstract: A wheel rotation detecting device including a sensor unit that is supported on a stationary ring which does not rotate even when the wheel is in use, and the rotation of the wheel that is attached to a rotary ring can be detected by a rotation detecting sensor held within the sensor unit. Within the sensor unit, in addition to a rotation detecting sensor, there are disposed other sensors such as a temperature sensor and a vibration sensor, thereby allowing detection of the rotation speed and the rotation number of the wheel supported on the rotary ring, as well as detection of other car driving conditions.
    Type: Grant
    Filed: January 24, 2002
    Date of Patent: May 17, 2005
    Assignee: NSK Ltd.
    Inventors: Takeshi Takizawa, Shigeru Endo, Ikunori Sakatani, Tatsunobu Momono, Yasushi Mutoh
  • Patent number: 6836028
    Abstract: A segmented arc generator is adapted to convert mechanical power such as wind or water power into electrical power at a wide range of wind or shaft speeds. A rotor has a plurality of salient poles disposed about a periphery of a rotor ring. A stator has a stator ring disposed radially about and in close proximity to the rotor ring. The stator ring includes a plurality of stator coils wound on a ferromagnetic structure and having permanent magnets imbedded within the structure. Relative motion between a rotor pole and a corresponding stator coil induces a coil voltage across that coil. A phase controlled converter in electrical communication with the stator coils rectifies the output voltage. A pulse width modulated inverter is in electrical communication with the phase controlled converter for converting the D.C. voltage output by the phase controlled converter to an A.C. voltage of controlled amplitude and phase relationship determined with respect to a voltage waveform present on a connected utility grid.
    Type: Grant
    Filed: October 29, 2002
    Date of Patent: December 28, 2004
    Assignee: Frontier Engineer Products
    Inventors: G. William Northrup, Jimmie Joe Cathey, Lawrence Hoyt
  • Patent number: 6376957
    Abstract: A generator or a 3-phase motor is arranged to provide multipolar permanent magnet excitation in combination with multipolar reluctance distribution wherein different numbers of poles are used for the permanent magnet excitation and for the reluctance distribution so that the principal working flux has a finite waveform. An annular rotor rotates about a cruciform stator. The magnets are buried in pole pieces of the stator so they converge radially inwardly with a triangular pole piece between them. Each pole piece is joined to the remainder of the stator by a bridge piece. The inner periphery of the rotor is formed as a circumferential array of teeth separated by recesses. The rotor may be within an annular stator or the machine may be linear.
    Type: Grant
    Filed: April 18, 2000
    Date of Patent: April 23, 2002
    Assignee: Newage International Ltd.
    Inventors: Lawrence Haydock, Edward Spooner
  • Patent number: 6252325
    Abstract: In a switched reluctance motor and control system for such a motor, a rotor comprises four salient poles each having a width of about 50-degrees, and a stator has six salient poles each having a width of about 30-degrees. One Excitation winding is mounted around each stator salient pole and these are connected in series. An excitation drive circuit supplies a dc excitation current to each excitation winding to excite the motor in accordance with an excitation command signal. A torque-current drive circuit renders a current, whose magnitude in accordance with a torque command, to flow into torque windings mounted one round on each of the six stator salient poles successively according to the angle of rotation of the rotor.
    Type: Grant
    Filed: August 31, 1999
    Date of Patent: June 26, 2001
    Assignee: Okuma Corporation
    Inventor: Masayuki Nashiki
  • Patent number: 6210596
    Abstract: A magnetic ceramic composition containing ferrite serving as a primary component and a sintering aid. The composition can be sintered at low temperature. The sintering aid contains about 2-45 mol % Li2O; about 5-40 mol % RO, with R being at least one of Ba, Sr, Ca, and Mg; and about 30-70 mol % (Ti, Si)O2 with SiO2 accounting for at least about 15 mol %. The resultant composition provides inductor elements in which migration of inner conductors is suppressed, and insulation deterioration and increase of direct-current resistance is restrained.
    Type: Grant
    Filed: December 23, 1998
    Date of Patent: April 3, 2001
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Kazuhiko Takenaka, Tatsuru Takaoka
  • Patent number: 6140727
    Abstract: A pulse signal generator comprises a magnetic element (1) capable of causing a large Barkhausen jump; a detector (2) provided relative to the magnetic element; a magnetic field generator (3) provided in vicinity of the magnetic element for applying a biasing magnetic field to the magnetic element for making a predetermined magnetization; and a magnetic circuit forming unit (4) provided in vicinity of the magnetic element for applying a main magnetic field to the magnetic element for causing a large Barkhausen jump in the magnetic element. The magnetic field generator is provided with magnetic field concentration means (32A) for concentrating the biasing magnetic field upon the magnetic element and the magnetic field adjusting means (74) for adjusting an intensity of the biasing magnetic field upon the magnetic element.
    Type: Grant
    Filed: November 5, 1998
    Date of Patent: October 31, 2000
    Assignee: Hirose Electric Co., Ltd
    Inventors: Akihiro Goto, Shoji Oyama, Tomoaki Ito
  • Patent number: 6137268
    Abstract: A battery charging system in which current is averaged over a long time period (seconds) to determine the maximum average charging rate. When the integral of charging current over this long period reaches the programmed maximum charge value for one period, current is simply cut off for the remainder of the fixed long period.
    Type: Grant
    Filed: June 30, 1997
    Date of Patent: October 24, 2000
    Assignee: Compaq Computer Corporation
    Inventors: Nathan Mitchell, Joseph F. Freiman
  • Patent number: 6057622
    Abstract: A method and apparatus for field weakening in PM machines uses field weakening coils (35, 44, 45, 71, 72) to produce flux in one or more stators (34, 49, 63, 64), including a flux which counters flux normally produced in air gaps between the stator(s) (34, 49, 63, 64) and the rotor (20, 21, 41, 61) which carries the PM poles. Several modes of operation are introduced depending on the magnitude and polarity of current in the field weakening coils (35, 44, 45, 71, 72). The invention is particularly useful for, but not limited to, the electric vehicle drives and PM generators.
    Type: Grant
    Filed: January 21, 1999
    Date of Patent: May 2, 2000
    Assignee: Lockhead Martin Energy Research Corporation
    Inventor: John S. Hsu
  • Patent number: 5894219
    Abstract: A device for determining rotary motions generally includes a signal generator with inwardly directed teeth or inwardly directed projections and a double-sided measuring coil which is arranged within the surface of the signal generator. The measuring coil has a core of permanent magnets and pole shoes. The pole shoes project from both sides of the coil and extend up to the inner surface of the signal generator. The pole shoes are designed, arranged and conformed to one another so that, whenever the end piece of a pole shoe points to a tooth or a projection, the second, diametrically opposite end of the pole shoe is directed to a tooth gap or depression. The measuring coil core is made up of at least two permanent magnets which are magnetized perpendicularly to the coil axis and respectively embedded between two pole shoes.
    Type: Grant
    Filed: September 5, 1997
    Date of Patent: April 13, 1999
    Assignee: ITT Manufacturing Enterprises Inc.
    Inventors: Andre F. L. Goossens, Bernard Scholiers
  • Patent number: 5696442
    Abstract: A rotational velocity sensor ring comprising a circular cylindrical body with a radially interior cylindrical surface, a radially exterior cylindrical surface and first and second cylinder ends, a plurality of substantially equally spaced, substantially equal length fingers extending from the first cylinder end, and on each of the fingers, a substantially 180.degree. bend proximate to the first cylinder end, wherein each finger is radially exterior of the circular cylindrical body, wherein each finger has a finger end extending toward a second cylinder end opposite the first cylinder end, wherein each finger is proximate to the radially exterior cylindrical surface and parallel to a cylinder axis of the circular cylindrical body, wherein the fingers comprise a set of teeth of the rotational velocity sensor ring.
    Type: Grant
    Filed: July 19, 1996
    Date of Patent: December 9, 1997
    Assignee: General Motors Corporation
    Inventors: David Alden Foster, Debbie Sue Wadsworth-Dubbert
  • Patent number: 5696419
    Abstract: An electrical generator has a plurality of C-shaped stator members which are made of magnetically permeable material. Each C-shaped stator member includes a respective stator winding, and the stator members are positioned such that the ends of the members form first and second planar rings of equal diameter to establish a gap therebetween. A flat, ring-shaped rotor defines a periphery, and a plurality of permanent magnets are positioned around the periphery. The rotor is positioned with the magnets of the rotor disposed in the gap defined by the stator members. Consequently, when the rotor is rotated by a prime mover to move the magnets through the gap, an electrical current is induced in the stator windings.
    Type: Grant
    Filed: June 13, 1994
    Date of Patent: December 9, 1997
    Assignee: Alternative Generation Devices, Inc.
    Inventors: Thomas G. Rakestraw, Alan E. Rakestraw
  • Patent number: 5508608
    Abstract: A device for measuring rotary motions having a signal generator ring which rotates with the rotating part and of a double-sided measuring coil. Within the core of the measuring coil there are a permanent magnet, which is magnetized perpendicularly to the coil axis, and two elongated pole shoes which are arranged on the pole surfaces of the permanent magnet and whose end pieces protrude from both sides of the coil and reach almost as far as the signal generator ring. The signal generator ring and the pole shoes are designed, arranged and attuned in respect of one another so that, during the rotary motion, the magnetic flux alternately passes via the end piece of one pole shoe to the end piece of the pole shoe arranged on the second pole surface, which end piece protrudes from the other side of the coil, and thereupon passes via the two other end pieces of the pole shoes. Provided as signal generator ring is a toothed wheel with inwardly directed teeth or several toothed wheels firmly coupled with one another.
    Type: Grant
    Filed: October 28, 1994
    Date of Patent: April 16, 1996
    Assignee: ITT Automotive Europe GmbH
    Inventor: Andre F. L. Goossens
  • Patent number: 5416372
    Abstract: The sensitivity of an induction-type motion sensor having a magnetic circuit with a permanent magnet to small movements is increased by the use of a stator with a core containing a permanent magnet as a fixed part thereof. An electrical coil is wound around the stator and a pendulum-type rotor has a ferromagnetic moving element which, when the motion sensor is subjected to movement forces, passes in and out of the air gap of the stator, thereby alternating the magnetic field in the stator and inducing a current in the electrical coil.
    Type: Grant
    Filed: August 19, 1993
    Date of Patent: May 16, 1995
    Assignee: Siemens Elema AB
    Inventor: Karin Ljungstroem
  • Patent number: 5376851
    Abstract: A variable reluctance drive system including a motor and corresponding converter for improved current commutation is described. The motor incorporates a salient pole rotor and a salient pole stator having one or more full pitch windings which operate by mutual inductance to transfer the current from the active short pitch winding following phase alignment. This increases output torque and/or speed and permits a number of simple and economical converter circuits.
    Type: Grant
    Filed: May 18, 1992
    Date of Patent: December 27, 1994
    Assignee: Electric Power Research Institute, Inc.
    Inventors: Thomas A. Lipo, Feng Liang
  • Patent number: 5291130
    Abstract: A vehicle wheel speed sensor incorporated on an axle spindle hub and hub cap assembly of the type using permanent magnets to generate a magnetic field having a magnetic path conducted through a plurality of teeth on a flange extending from the hub cap into a plurality of teeth on a stator with relative motion therebetween upon rotation of the wheel where the frequency of the change in the magnetic reluctance varies at a frequency proportional to the wheel speed. The stator is mounted to the end of the axle spindle by a securing bolt so that the stator can be easily removed for service without disturbing the axle bearings. As a part of the stator assembly, a locating plate is provided which allows the operating gap between the teeth formed in the flange and the teeth formed in the stator to be easily established upon assembly of the hub cap to the wheel hub by allowing the rotor to contact the locating plate when the hub cap securing bolts have been loosened and the axle is supported.
    Type: Grant
    Filed: January 25, 1993
    Date of Patent: March 1, 1994
    Assignee: Eaton Corporation
    Inventor: James M. Kendzior
  • Patent number: 5281911
    Abstract: A vehicle wheel speed sensor of the type using permanent magnets to generate a magnetic field having a magnetic path which is conducted through a plurality of teeth on a rotor into a plurality of teeth on a stator with relative motion therebetween where the frequency of the change in the magnetic reluctance varies at a frequency proportional to the wheel speed. The stator is mounted to the end of the axle spindle by way of a securing bolt so that the stator can be easily removed for service without disturbing the axle bearings. As a part of the stator assembly, a locating plate is provided which allows the operating gap between the rotor and the stator to be easily established upon assembly of the hub cap to the wheel hub by allowing the rotor to contact the locating plate when the hub cap securing bolts have been loosened and the axle is supported.
    Type: Grant
    Filed: November 8, 1991
    Date of Patent: January 25, 1994
    Assignee: Eaton Corporation
    Inventors: LaVerne A. Caron, James M. Kendzior
  • Patent number: 5124602
    Abstract: A d.c. motor unit with a rotational speed detector comprising a d.c. motor (1) having an output end and an idle end, and a rotational speed detector (14) water-tightly attached to the motor output end. The d.c. motor (1) comprises a motor frame (2) including an output end and an idle end, a mounting bracket (9) attached to the output end of the motor frame (2) and a rotary shaft (4) having an idle end rotatably supported by the motor frame (2) and an output end rotatably supported by and extending outwardly through the mounting bracket (9). The rotational speed detector (14) comprises a rotary portion mounted on the output end of the rotary shaft (4) and a stationary portion mounted to the mounting bracket at the output end of the motor frame (2). The rotational speed detector (14) comprises a substantially elastic permanent magnet plate (20) for generating a magnetic flux (.phi.
    Type: Grant
    Filed: April 9, 1991
    Date of Patent: June 23, 1992
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Toshihiko Nishimura, Masafumi Ohkuma, Teruaki Matsunaga
  • Patent number: 5059884
    Abstract: A variable reluctance motor (10, 100, 200) for providing holding torque in accordance with the invention includes a magnetically permeable rotor (12); a stator (18) axially aligned with the rotor having at least one phase winding (22) for producing a magnetic field causing the rotor to rotate; and a first cylindrical magnet (26) mounted coaxial with and outboard from a first side of the rotor which creates a permanent magnetic field coupling the rotor to the magnet to provide holding torque.
    Type: Grant
    Filed: April 10, 1990
    Date of Patent: October 22, 1991
    Assignee: Sundstrand Corporation
    Inventors: Mahesh J. Shah, Jayant G. Vaidya
  • Patent number: 5057727
    Abstract: A Wiegand-effect shaft position sensor is excited by an alternating magnetic field generated by stationary magnets or solenoids interacting with a high-strength, toothed wheel that is fixed to the rotor. A set of three stationary poles are situated proximate to the rotor and are connected together by a yoke. The magnets or solenoids are mounted in the outside poles of the set of three stationary poles. The central stationary pole contains a Wiegand-effect device. In operation, a flux reversal in the Wiegand-effect device occurs at twice the frequency at which the poles of the toothed wheel pass the stationary poles, resulting in the generation of sharp voltage pulses indicative of rotor position.
    Type: Grant
    Filed: November 13, 1990
    Date of Patent: October 15, 1991
    Assignee: General Electric Company
    Inventor: Donald W. Jones
  • Patent number: 5045784
    Abstract: A current carrying drive coil in a magnetic field is moved by the field. An attached tachometer coil, passing through the same field, produces a voltage from which the speed of the coils may be calculated. Changes in the drive coil current produce noise in the tachometer coil. This noise is offset by combining the tachometer voltage with the voltage produced by a stationary pickup coil, which picks up only the noise.
    Type: Grant
    Filed: August 21, 1989
    Date of Patent: September 3, 1991
    Assignee: Rockwell International Corporation
    Inventors: Frank A. Pizzarello, Clifford D. Dax
  • Patent number: 5023546
    Abstract: A variable reluctance rotation sensor comprises a rotatable magnetic toothed wheel adjacent a fixed magnetic pickup assembly. The pickup assembly comprises a pair of permanent magnets, each with a similar pole adjacent the wheel and separated circumferentially by the arc between a tooth and a non-adjacent slot. A magnetic flux member with a coil joins the other poles of the magnets in series opposed relationship and extends in close proximity to the tooth wheel to establish separate flux loops for each magnet distributed along the coil. The flux loops are spatially determined by the teeth and slots between the permanent magnets, so that they fluctuate circumferentially and generate an electrical signal in the coil with wheel rotation by variation of the flux linkages to individual turns of the coil. The sensor thus uses spatial flux changes to produce a rotation signal at very low rotational speeds with a larger air gap than that of conventional sensors.
    Type: Grant
    Filed: November 8, 1989
    Date of Patent: June 11, 1991
    Assignee: General Motors Corporation
    Inventors: Andrzej M. Pawlak, Takeshi Shirai
  • Patent number: 5023547
    Abstract: A variable reluctance rotation sensor comprises a rotatable toothed wheel and a magnetic pickup assembly comprising a pair of permanent magnets each having a pair of poles with an opposite one of said poles adjacent the toothed wheel. The permanent magnets are separated from each other by an arc equal to the arc between two of the teeth and joined by a magnetic flux member with a multi-turn electrical coil wound thereon. The flux member establishes a common main flux loop through the first and second permament magnets but also extends close to the toothed wheel to further establish additional flux loops separately through each of the permanent magnets. Passage of alternating teeth and slots as the wheel rotates produces a spatial fluctuation in the additional flux loops between the magnets to vary the flux linkages with individual coil turns and increase the electrical signal in the coil over the signal level that would be produced by variations in air gap of the common flux loop alone.
    Type: Grant
    Filed: November 8, 1989
    Date of Patent: June 11, 1991
    Assignee: General Motors Corporation
    Inventors: Andrzej M. Pawlak, Takeshi Shirai