Hall Effect Generators And Converters Patents (Class 310/DIG3)
  • Patent number: 6144126
    Abstract: The driving ring magnet 2 of 4 n magnetic poles is allocated on the rotor 1. 3 m flat coils 5 are allocated on the stator 3 with surrounding the FG (Frequency Generator) pattern 4. Each flat coil 5 is allocated in the distance of (5/3).pi. of the electrical angle with being adjacent to each other. The magnetic sensor 6 is allocated in the area 20 of the maximum spacing area between the flat coils 5.
    Type: Grant
    Filed: September 27, 1999
    Date of Patent: November 7, 2000
    Assignee: Victor Company of Japan, Ltd.
    Inventor: Mitsuo Kodama
  • Patent number: 6127752
    Abstract: The invention is based on an electrically operated motor, having a shaft with a magnet rotor body, the RPM of the shaft can be picked up by a Hall sensor disposed on a circuit board. The circuit board is embodied with soldered pins or contact shoes and is integrated into a component of the motor, and that contacts, supply and signal lines for the circuit board are injected and/or plugged into the component of the motor.
    Type: Grant
    Filed: October 7, 1998
    Date of Patent: October 3, 2000
    Assignee: Robert Bosch GmbH
    Inventor: Martin Wiesler
  • Patent number: 6097129
    Abstract: An electronically commutated external rotor motor has an external rotor having a cup-shaped housing and a radially magnetized permanent magnet connected in the cup-shaped housing. An interior stator is positioned in the cup-shaped housing. The interior stator has a laminated core having grooves. Windings are provided within the grooves. The windings have first end turns proximal to a bottom of the cup-shaped housing and second end turns positioned distal to the bottom. The first and second end turns electrically connect the windings to one another. The permanent magnet has an end face remote from the bottom of the cup-shaped housing. At least one galvano-magnetic rotor position sensor is arranged opposite the end face of the permanent magnet so as to be located within a magnetic leakage of the permanent magnet and within a magnetic leakage of the interior stator. The at least one rotor position sensor is designed to control current within at least a portion of the windings.
    Type: Grant
    Filed: March 19, 1999
    Date of Patent: August 1, 2000
    Assignee: Papst-Motoren GmbH & Co. KG
    Inventors: Patrick Furtwangler, Hermann Rappenecker, Harald Reich, Gabor Szondi
  • Patent number: 6005320
    Abstract: A two-phase brushless direct-current (BLDC) motor having a single Hall effect device. The BLDC motor includes a stator comprised of 2n coils grouping as first and second phase coils at a uniform interval, and a rotor which N-pole and S-pole magnets of the same number as that of the stator coils are alternately disposed, the 2n magnets forming n pairs, each pair of magnets are disposed at a uniform interval, wherein a distant ratio from the center of one N-pole magnet to the centers of the S-pole magnets adjacent the N-pole magnet is established into 1:1.4. Since 2n auxiliary magnets are disposed annularly on the rotor with the same length as each other corresponding to the N-pole and S-pole magnets, a single Hall effect device detects the magnetic pole by magnetic flux of the rotating auxiliary magnets and generates the rotating position signal of the rotor, so that a switching controller can activate the first and second phase coils alternately.
    Type: Grant
    Filed: June 22, 1999
    Date of Patent: December 21, 1999
    Assignee: Amotron Co., Ltd.
    Inventors: Byung Kyu Kim, Joon Kim
  • Patent number: 5744894
    Abstract: A brushless motor is provided. The brushless motor of the present invention includes a shaft, a rotor, having a plurality of field magnets attached thereto, fixed to the shaft, a stator for forming a magnetic field to enable rotation of the rotor, a housing in which the rotor and stator are installed, and a motor driving unit, wherein the arc length of a portion of the field magnet used for detecting the position of the rotor and that of the remaining portion thereof are formed to be different from each other.According to the brushless motor of the present invention, it is possible to increase efficiency of the brushless motor and to reduce manufacturing costs.
    Type: Grant
    Filed: October 21, 1996
    Date of Patent: April 28, 1998
    Assignee: Dongyang Mechatronics Corporation
    Inventors: Jae-sung Cho, In-jae Lee
  • Patent number: 5502383
    Abstract: A controller for a Hall effect sensor includes a sensor section including a Hall effect sensor with a hysteresis set in the output electric signal characteristic with respect to the magnetic flux density, a power supply section for supplying a source power to the Hall effect sensor, and a signal processor for processing a signal output from the sensor section. The power supply section supplies power with a voltage, which is varied cyclically in a predetermined range and is increased gradually, to the Hall effect sensor.
    Type: Grant
    Filed: June 7, 1994
    Date of Patent: March 26, 1996
    Assignee: Showa Corporation
    Inventors: Yasuo Funami, Manabu Nishi, Yoshimi Watanabe, Shunya Senda
  • Patent number: 5381064
    Abstract: A plurality of stepper motors, each of which comprises a stator assembly and a rotor, are axially aligned to form with a control system an encoder for use in a printing apparatus. The rotors constitute print wheels which support different print characters. The stator assembly of each motor only extends above a part of the circumference of the associated rotor. This enables the axial extent of the print wheels to be reduced, A sensor arrangement is provided to enable the home position of each wheel to be determined. In operation, the control system receives desired print character information and rotates the associated rotor to the correct position for printing to take place. Once all rotors have been rotated to their desired position for printing, printing can then take place. The arrangement enables the printing process to run faster than previously.
    Type: Grant
    Filed: January 13, 1993
    Date of Patent: January 10, 1995
    Assignee: Macon Management & Design Limited
    Inventors: Richard I. Bennet, Ian Gibb
  • Patent number: 5325005
    Abstract: A brushless electric motor with Hall-effect sensors is configured to provide its stator structure with a portion which projects axially away from a main armature. The projecting portion is radially congruent with a second, smaller armature coaxial with the main armature, with a portion of a sleeve in which the sensors are disposed in circumferentially spaced configuration, and with a laminated annular shield iron. The annular shield iron is radially interposed between the projecting portion of the stator structure and the sensors. In this configuration, the shield iron serves to close the magnetic field originating from the second armature and interacting with the sensors while simultaneously shielding the sensors from field effects attributable to current flow in the axially projecting portion of the stator structure.
    Type: Grant
    Filed: June 3, 1992
    Date of Patent: June 28, 1994
    Assignee: AlliedSignal Inc.
    Inventor: Joseph Denk
  • Patent number: 5319271
    Abstract: A DC motor pulse signal generating device comprising a DC motor including a rotor frame with a magnet for pulse generation and a substrate for supporting the rotor frame. A magnetic sensor is mounted on the substrate for detecting magnetic flux generated from the magnet and outputting a signal. A positioning groove is formed on the substrate to receive the magnetic sensor on a fixed position. Thereby, the gap between the magnetic sensor and the magnet is fixed so that stable pulses are generated, and the height of the center of the magnetic sensor is lowered to the level of the center of the magnet so that magnetic flux is detected most efficiently by the magnetic sensor.
    Type: Grant
    Filed: July 23, 1992
    Date of Patent: June 7, 1994
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Hideki Shimada, Yoshifumi Shimogaki, Motoyoshi Kawai
  • Patent number: 5161361
    Abstract: A brushless DC motor-driven spindle assembly for a textile ring spinning frame wherein a shaft for rotatably supporting a bobbin for yarn collection is mounted for rotation about a central axis of rotation in a bolster section and, under certain conditions of operation, for rotation about axes which are incrementally angularly displaced from the central axis of rotation, and including rotor/stator position detecting elements comprising sensed elements mounted on the motor rotor for rotation therewith and sensing elements mounted in fixed position relative to the rotor and adjacent the path of movement of the sensed elements so as to maintain the same radial distance between the sensing elements and the sensed elements during incremental angular displacement of the axis of rotation of the shaft and motor rotor.
    Type: Grant
    Filed: August 30, 1991
    Date of Patent: November 10, 1992
    Assignee: Platt Saco Lowell Corporation
    Inventors: Perry E. Talley, Michael P. DeKoning, Richard N. Ryer, II
  • Patent number: 5146125
    Abstract: An electric rotating machine, which can be operated as either a motor or generator, utilizes material exhibiting a Hall effect to replace the normal slip rings or mechanical commutation devices. Preferably, a slab of Hall effect material is curved to extend circumferentially around the rotor between the rotor and stator, and the rotor is adapted to create a magnetic field. When used as a motor, a source of electrical power is connected to the Hall effect material to cause a primary current to flow therein. The combination of the rotor magnetic field and the primary current flowing in the Hall effect material produces a Hall effect current which creates a torque on the rotor causing it to rotate. When used as a generator, the rotor is rotated and induces a primary current to flow in the Hall effect material. The combination of the rotor magnetic field and the induced primary current produces a Hall effect voltage and current that can be connected to power an electrical load.
    Type: Grant
    Filed: July 29, 1991
    Date of Patent: September 8, 1992
    Inventor: Jack H. Kerlin
  • Patent number: 5041749
    Abstract: A DC brushless motor comprising a rotor shaft, and rotor assembly mounted on the rotor shaft. The rotor assembly includes a permanent magnet rotor and a plurality of sequentially stacked rotor laminations positioned between the rotor magnet and the rotor shaft. The permanent magnet rotor is magnetized with N number of rotor poles. A stator assembly in magnetic flux relationship with the rotor assembly is provided. The stator assembly includes plurality of sequentially stacked stator laminations with each stator lamination having N number of stator poles. The stator laminations are juxtaposed to the permanent magnet rotor such that each stator pole is of a different polarity from the corresponding rotor pole. The distance between the stator and rotor poles forms an air gap. Each of the stator poles are slightly skewed with respect to each of the corresponding rotor poles such that the air gap is asymmetrical. Electrical windings are provided for energizing the stator poles to operate the rotor.
    Type: Grant
    Filed: April 19, 1990
    Date of Patent: August 20, 1991
    Assignee: Iskra Electromorji
    Inventors: Mirko Gaser, Richard Kavanaugh
  • Patent number: 4973869
    Abstract: The present invention relates to a disc type brushless coreless DC motor which includes a rotor and stator. The DC motor includes a position-detecting sensor installed and secured below an effective coil part of an armature coil, and a single screw having a rounded head is installed at the position 1/5 of a magnetic pole width .+-.n.pi./2 apart from the position-detecting sensor along a clockwise (or counter clockwise) direction when the rotating direction of the rotor is counter clockwise (or clockwise), thereby permitting the achievement of easy production, low cost, and especially light weight, and, further, larger starting torque with a lower starting voltage in the DC motor.
    Type: Grant
    Filed: July 24, 1989
    Date of Patent: November 27, 1990
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventor: Doo-Man Cho
  • Patent number: 4961017
    Abstract: A stator having a stator yoke, a first and second printed substrates, a plurality of drive coils and hall elements mounted on the first substrate, and a group of drive circuits mounted on the second substrate, wherein an end of the drive coil which is to be connected to the group of the drive circuits is directly connected to the second printed substrate.
    Type: Grant
    Filed: September 26, 1988
    Date of Patent: October 2, 1990
    Assignee: Akai Electric Co., Ltd.
    Inventors: Wataru Kakinoki, Noriaki Miyoshi, Koji Arai
  • Patent number: 4952830
    Abstract: A brushless motor in which the Hall elements are mounted around a sub-magnet by means of a holder and a printed circuit board is disclosed. The holder comprises a semicircular disk-shaped base portion and a semicircular cylindrical extension portion extending therefrom to oppose the outer circumferential surface of the sub-magnet across a small radial gap, wherein a plurality of rectangular bores for accommodating the Hall elements are formed in the extension portion at a fixed circumferential pitch, each bore having an axial depth substantially greater than the length of Hall elements. The Hall elements accommodated in respective bores are sealed by an adhesive, and the semicircular disk-shaped printed circuit board is attached on the base portion of the holder by means of a mortice and tenon joint, to close the bores of the holder. The leads of the Hall elements are soldered to the printed circuit pattern formed on the back surface of the printed circuit board.
    Type: Grant
    Filed: September 21, 1989
    Date of Patent: August 28, 1990
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Hiroyuki Shirakawa
  • Patent number: 4922513
    Abstract: A rotation control circuit for a Hall motor of reduced-size and suppressed irregular rotation and having a controller that stores in a memory circuit data indicative of an irregular magnetization of a rotor magnet derived from a change of the magnetic field of the rotor magnet detected by a Hall element as an irregular rotation informationsignal, in which the irregular rotation information signal is input to a speed servo loop of the Hall motor, whereby the change of magnetic field of the rotor magnet is used as an FG signal to form a speed servo circuit.
    Type: Grant
    Filed: September 22, 1989
    Date of Patent: May 1, 1990
    Assignee: Sony Corporation
    Inventor: Yoshiro Joichi
  • Patent number: 4893121
    Abstract: A printwheel encoder comprises a non-ferrous shaft having a magnet strip and a flexible Hall-effect sensor arrangement affixed thereon. Molded printwheels including a flux conducting ring having an inner spiral surface are rotatably mounted on the shaft in respective juxtaposition to each Hall-effect sensor. The wheels are mounted adjacent to each other so that the rings form a nearly continuous flux conducting sheath which protects the Hall-effect sensors from external magnetic fields.
    Type: Grant
    Filed: December 21, 1987
    Date of Patent: January 9, 1990
    Assignee: Pitney Bowes Inc.
    Inventor: Donatas V. Gasiunas
  • Patent number: 4874976
    Abstract: A spindle motor for rotating magneto-optical discs that are attracted and held on a fixed position at an end of a motor driven shaft by means of a clamping rotor with internal field magnets. The spindle motor has a set of stator coils and a set of field magnets held internally mounted on the shaft side of the clamping rotor. The field magnet and stator coil sets are arranged at a regular interval in a ring around the circumference of the clamping rotor and of a shield member of the spindle motor respectively, leaving a thin gap between the stator coils and the field magnets. The saucer-like clamping rotor is made of a non-magnetic material and applied at the disc side, on which side a magneto-optical disc is charged, of the rotary shaft. The field magnets, being fitted on the face of the clamping rotor opposed to the magneto-optical disc mounted face, function both as a means for driving the clamping rotor for motor operation, and as a disc-attracting device.
    Type: Grant
    Filed: August 8, 1988
    Date of Patent: October 17, 1989
    Assignee: Fuji Electric Co., Ltd.
    Inventors: Masahiro Ohsawa, Eiichi Yonezawa
  • Patent number: 4724346
    Abstract: A permanent magnet-excited rotor motor is disclosed wherein, a circuit board (6) mounted on a radial motor attachment flange (22) is arranged. The front and rear sides of the circuit board (6) are equipped with conductor strips. On the front side, Hall transducers (15) influenced by rotor magnets (81) in a speed dependent manner are mounted. A flat cable brought in from the outside is divided into a first cable portion (12), passed through from the front with supply and signal voltage lines for the Hall transducers (15), and into a second cable portion (13) passed through from the back to the front with winding feed lines for the stator coil winding ends (14), which are likewise passed through from the back to the front of the circuit board (6) and thus can be soldered to the freely accessible front side.
    Type: Grant
    Filed: September 11, 1986
    Date of Patent: February 9, 1988
    Assignee: Siemens Aktiengesellschaft
    Inventors: Hans-Wilhelm Klein, Ernst Grecksch, Helmut Schmidt
  • Patent number: 4668884
    Abstract: A brushless motor (10) comprises a stator yoke plate (16) made of a magnetic material, to which both main surfaces the first and the second flexible printed circuit boards (20) (22) formed integrally including a connecting part (24) are stuck respectively. On the first flexible printed circuit board (20), a plurality of driving coils (30) are arranged annularly and a conductor pattern for a speed detecting coil is formed inside the driving coils (30). On the integrated stator yoke plate (16) and the first and second flexible printed circuit boards (20) (22), a penetrated hole (18) for passing through a rotor shaft (54) is formed generally in the center. A tongue (36) is formed generally in protrusion inwardly from the periphery defining the penetrated hole (18) on which a connecting conductor pattern connected to the speed detecting coil is formed.
    Type: Grant
    Filed: April 24, 1985
    Date of Patent: May 26, 1987
    Assignees: Sanyo Electric Co, Kumagaya Seimitsu Co., Ltd.
    Inventors: Nobuyoshi Amao, Yoshihisa Takahashi, Hitoshi Yokomizo
  • Patent number: 4658162
    Abstract: A printed coil unit for use in a very thin type flat brushless motor or a linear actuator, in which a magnetic sensor element having a thickness smaller than 0.6 mm is embedded integrally within the coil unit without projecting therefrom in a region located outside and in the vicinity of spiral conductor coil patterns. The printed coil unit includes a single printed coil sheet or a lamination of such coil sheets each having more than one spiral conductor patterns on the same plane. A magnetic sensor element, such as Hall element or magneto-resistance element having a thickness equal to or smaller than that of the printed coil sheet is embedded within the coil sheet at blank regions located between adjacent spiral conductor patterns, or regions made availably by diminishing the size of a selected one of the spiral conductor patterns. A moving speed detecting coil or patterned conductor can be additionally provided on the other available area of the coil sheet.
    Type: Grant
    Filed: July 23, 1985
    Date of Patent: April 14, 1987
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Ryouhei Koyama, Yoshinobu Haruta
  • Patent number: 4594524
    Abstract: In a coreless-brushless motor in which a driving coil block is mounted on a stator yoke, a bearing is fixed to the stator yoke in alignment with the central portion of the driving coil block, a rotary shaft is rotatably supported by the bearing, a rotor yoke is affixed to the rotary shaft and a rotor magnet is mounted on the rotor yoke in adjacent and opposing relation to the driving coil block, a magnetoelectric transducer pellet is housed in a recess made in the stator yoke on the side of the driving coil block, for detecting magnetic fluxes emanating from the rotor magnet. The magnetoelectric transducer pellet is connected to wires of a flexible printed circuit sheet, which is disposed between the stator yoke and the driving coil block.
    Type: Grant
    Filed: February 22, 1984
    Date of Patent: June 10, 1986
    Assignee: Kangyo Denkikiki Kabushiki Kaisha
    Inventor: Michio Sudo
  • Patent number: 4433849
    Abstract: A control circuit for a vehicle levelling system including a detecting device for detecting a change in vehicle height with respect to a predetermined reference vehicle-height position and generating a directional signal and an adjustment-on or -off command signal. A control device is provided for controlling the operation of a mechanical system according to the signals, and a holding device is provided for holding the adjustment-off signal for a certain period of time even when the command signal has changed from the adjustment-off signal to the adjustment-on signal. In case a plurality of reference vehicle-height positions are provided, in order that the switching between the reference positions can be performed smoothly, there is provided a circuit for interrupting the function of the adjustment-off signal holding circuit temporarily according to the switching operation.
    Type: Grant
    Filed: November 9, 1981
    Date of Patent: February 28, 1984
    Assignee: Honda Giken Kogyo Kabushiki Kaisha
    Inventor: Taiji Ohmori
  • Patent number: 4377293
    Abstract: A level regulator for an automotive vehicle such that a power voltage is applied to the amplifiers only for a fixed period after a level signal has been detected or only while a level signal is being detected within a fixed period, so that a wasteful current can be prevented from being passed therethrough when the vehicle is left parked with one of the wheels on the sidewalk or uneven ground, and the battery can be protected against excessive discharge. The level regulator of the present invention comprises a power supply controller including a differential circuit, a switching transistor and a timer of a monostable multivibrator.
    Type: Grant
    Filed: January 9, 1981
    Date of Patent: March 22, 1983
    Assignee: Nissan Motor Company, Limited
    Inventor: Tetsuo Senoo
  • Patent number: 4364005
    Abstract: A tachometer generator comprising a generator section for producing rectangular polyphase alternating voltages having a peak value which is proportional to the speed of the rotor, and a commutator section including contactless change-over switches for successively transferring the alternating voltages from the generator section, and sensors for producing switching signals which actuate the change-over switches in accordance with the rotational position of the rotor of the generator section. In the commutator section the sensors are equivalent in number to the change-over switches and comprise Hall devices arrayed about a rotary shaft which is coupled to the generator section. The alternating voltages which are obtained successively from the coils of the generator section as the rotary shaft rotates, are transferred in order by the change-over switches to produce a speed signal, in analog form; which is proportional to the rotating speed of the rotor.
    Type: Grant
    Filed: July 16, 1980
    Date of Patent: December 14, 1982
    Assignee: Fujitsu Fanuc Limited
    Inventors: Yoshinori Kohzai, Yoichi Amemiya, Yoshiki Fujioka, Noboru Iwamatsu
  • Patent number: 4357563
    Abstract: A hollow cylindrical permanent magnet having its semicircle magnetized as N pole and the remaining semicircle magnetized as S pole forms the rotor. Two stator magnetic poles which are planted radially around the outer periphery of a cylindrical stator yoke, pole shoes which are firmly mounted on the outer peripheral side of each stator magnetic pole so as to have its outer peripheral side oppose to the inner peripheral surface of aforesaid permanent magnet, and intermediary magnetic poles which are planted radially on the outer periphery of the stator yoke so as to place each of them in between each of these pole shoes, form the stator with all of these components made of magnetic materials. Around each of the stator magnetic poles windings are wound.
    Type: Grant
    Filed: June 30, 1981
    Date of Patent: November 2, 1982
    Assignee: Japan Servo Co.
    Inventor: Osamu Ohno
  • Patent number: 4311933
    Abstract: A brushless D.C. motor has electrical power switched between the phase windings by means of a circuit which includes a plurality of hall effect switches. The hall effect switches are operated by a plurality of arcuate commutating magnets which are radially polarized and are disposed axially adjacent to field magnets which are also radially polarized. Ordinarily, the direction of radial polarization of the commutating magnets and the field magnets will be opposite.
    Type: Grant
    Filed: August 27, 1979
    Date of Patent: January 19, 1982
    Assignee: North American Philips Corporation
    Inventors: William D. Riggs, Joseph J. Schegan
  • Patent number: 4283664
    Abstract: The control signal generator contains two Hall effect generators which are shifted relative to each other by 90.degree. electrically and magnetically, alao a gating circuit which derives from the Hall signals control signals for the switching elements of the commutating device. In order to make it possible to drive the motor digitally, the invention provides that the gating circuit comprise a combinatorial circit and, succeeding it, a 1-of-4 logic circuit. The combinatorial circuit furnishes two digital drive signals whose switching instants are shifted correspondingly .+-.45.degree. electrically relative to the zero crossings of the Hall signals.
    Type: Grant
    Filed: December 21, 1979
    Date of Patent: August 11, 1981
    Assignee: Siemens Aktiengesellschaft
    Inventor: Hermann Ebert
  • Patent number: 4275703
    Abstract: The AC signal generator furnishing the basic control signal for ignition timing is a Hall generator the flux through which is gradually increased while the crankshaft of the engine rotates through a predetermined angle of rotation. The Hall generator is part of a magnetic circuit which also includes an air gap. The change in flux is accomplished by rotating a tapered magnetically conductive member through the air gap. The output of the Hall generator is applied through a linear amplifier to a threshold circuit whose output controls an electronic interrupter switch connected in series with the ignition coil.
    Type: Grant
    Filed: August 24, 1979
    Date of Patent: June 30, 1981
    Assignee: Robert Bosch GmbH
    Inventors: Bernd Bodig, Herman Roozenbeek, Werner Jundt
  • Patent number: 4204158
    Abstract: A device for detecting specific positions of a moving part, for example a rapidly rotating part provided with soft-magnetic projecting elements which alternately pass close to the detector device, which comprises a stationary magnetic exciter circuit for a Hall-effect crystal.The magnetic exciter circuit comprises a single permanent magnet having one pole face oriented towards the moving part, and provided with two symmetrical soft-magnetic pole pieces forming a narrow gap in which the Hall-effect crystal is disposed.
    Type: Grant
    Filed: March 30, 1978
    Date of Patent: May 20, 1980
    Assignee: U.S. Philips Corporation
    Inventors: Jean-Pierre Ricouard, Bruno Schorter
  • Patent number: 4130769
    Abstract: A brushless motor has a rotor composed of a permanent field magnet, an armature functioning as stator and a position detecting element for detecting the positions of magnetic poles of said permanent magnet rotor and accordingly switching the electric current to an armature coil body of said stator thereby causing rotary motion of said permanent magnet rotor. Said armature coil body contains plural coils of given number of turns in a polygonal form of which at least two sides are placed parallel to the rotary axis of motor. Said coils are mutually arranged in a partially overlapping relationship to form a cylindrical body with one of said two sides being located at the internal surface of said cylindrical body while the other side is located at the external surface thereof so as to compose a coreless cylindrical armature body.
    Type: Grant
    Filed: October 31, 1975
    Date of Patent: December 19, 1978
    Assignees: Canon Kabushiki Kaisha, Canon Seiki Kabushiki Kaisha
    Inventor: Yukuo Karube
  • Patent number: 4086519
    Abstract: A Hall effect shaft angle position encoder is constructed using a plurality of magnetic elements independent of any magnetic rotor of the electrical device which may be a brushless motor or brushless tachometer. The plurality of magnetic elements has serially alternating polarities of magnetic north and south with at least one Hall effect sensor mounted in spaced and confronting relation with the magnetic elements for sensing the alternating polarities and producing output signals representative of the magnetic polarities where the signals include a ramp voltage passing through zero value. The magnetic elements are secured to the rotor outside the normal rotor elements of the device.
    Type: Grant
    Filed: February 25, 1977
    Date of Patent: April 25, 1978
    Assignee: Electro-Craft Corporation
    Inventor: Erland K. Persson
  • Patent number: 4086533
    Abstract: A device for determining the angular position of a rotating part includes first and second parallel arranged magnets forming a symmetric magnetic excitation circuit with a Hall-effect element disposed on the axis thereof. The rotating part has first and second elements made of a soft magnetic material which are angularly displaced so as to alternately pass by the first and second magnets, respectively, to produce first and second oppositely directed transverse magnetic field components, H, at the Hall-effect element which thereby generates a signal whose polarity reverses to indicate angular position of the rotating part.
    Type: Grant
    Filed: November 8, 1976
    Date of Patent: April 25, 1978
    Assignee: U.S. Philips Corporation
    Inventors: Jean-Pierre Ricouard, Bruno Schorter
  • Patent number: 4011476
    Abstract: A signal generating mechanism for producing a pulsed DC electrical voltage signal having a frequency proportional to the angular velocity of a rotating shaft. The signal generating mechanism may be used in the distributor of a breakerless ignition system for a multi-cylinder internal combustion engine, in which case the frequency of the pulsating voltage signal is equal to the rate at which ignition sparks are to be generated. The signal generating mechanism includes a baseplate and a bushing through which the rotating shaft passes. A stator assembly is formed by a hub and lower and upper plates affixed thereto, the stator assembly being rotatable about the bushing and further including at least one Hall effect sensor and integrated circuit mounted in a nonmagnetic supporting structure secured to the upper plate. A permanent magnet also is attached to the supporting structure and is radially spaced from the Hall effect sensor and integrated circuit.
    Type: Grant
    Filed: December 22, 1975
    Date of Patent: March 8, 1977
    Assignee: Ford Motor Company
    Inventor: Garry E. Beard
  • Patent number: 3967144
    Abstract: A Hall-voltage device in which a rotatable box is disposed in the air gap of a magnetic circuit. The box is arranged to receive a fluid having charged particles distributed therein, which fluid can cooperate with electrodes. One end face of the box is provided with an aperture through which a thin, flexible disc of plastic foil, which serves as the electrode support and has a radial cut, can be inserted into the box. The disc is provided with electrodes and associated discharge conductors and can be fixed in the box by means of a pivot extending through the aperture, which pivot includes terminals to which the discharge conductors extend.
    Type: Grant
    Filed: May 19, 1975
    Date of Patent: June 29, 1976
    Inventor: Ferdinand Hubert Franciscus Gerardus Spierings