Electric Circuit Elements Patents (Class 310/68R)
  • Patent number: 6166464
    Abstract: A power module for a motor in which the module is arranged to house both the high power devices needed to drive the phase windings of the motor and the control electronics needed to control the operation of the high power devices. The components are arranged such that the thermal energy generated by the high power devices is directed away from the control electronics for subsequent dissipation. An insulated metal substrate is used as the base of the module for directing the thermal energy. Further, the module components can be easily assembled through the use of solderless resilient connections from the control electronics to the other components in the module. The module employs a base, a power shell coupled to the base, and a circuit board positioned within the internal chamber of the power shell. The power shell has a plurality of walls forming an internal chamber and at least one conductive region. At least one electronic device is mounted to the conductive region.
    Type: Grant
    Filed: August 17, 1999
    Date of Patent: December 26, 2000
    Assignee: International Rectifier Corp.
    Inventor: William Grant
  • Patent number: 6163097
    Abstract: An axial field motor/generator having a rotor that includes at least three annular discs magnetized to provide multiple sector-shaped poles. Each sector has a polarity opposite that of an adjacent sector, and each sector is polarized through the thickness of the disc. The poles of each magnet are aligned with opposite poles of each adjacent magnet. Metal members adjacent the outermost two magnets contain the flux. The motor/generator also has a stator that includes a stator assembly between each two adjacent magnets. Each stator assembly includes one or more conductors or windings. Although the conductors may be formed of wire having a round, uniform cross-section, they may alternatively be formed of conductors having a tapered cross-section that corresponds to the taper of the sectors in order to maximize the density of the conductor in the gap between axially adjacent poles. The conductors may also alternatively be formed of traces in a printed circuit, which may have one or more layers.
    Type: Grant
    Filed: February 1, 1999
    Date of Patent: December 19, 2000
    Assignee: Smith Technologies Development, LLC
    Inventors: Stephen H. Smith, Yuval Shenkal
  • Patent number: 6158857
    Abstract: An ink-jet printer for ink-jet printing onto a print media. The printer has an ink-jet cartridge for ejecting ink onto a print medium during printing operations. A rotating drum platen holds a print medium on an outer surface thereof, the drum platen having an interior volume defined therein and an end wall extending transversely to the outer surface. A carriage holds the cartridge in a closely arranged position relative to the external surface of the drum. A drum drive apparatus rotates the drum to move the print medium in relation to the printhead of the cartridge. The printer further has a printer controller mounted in a fixed position relative to a printer chassis, and an electronic circuit disposed in the interior volume of the drum platen. A data communication link passes data between the printer controller and the electronic circuit.
    Type: Grant
    Filed: April 29, 1999
    Date of Patent: December 12, 2000
    Assignee: Hewlett-Packard Company
    Inventor: Steven B. Elgee
  • Patent number: 6153955
    Abstract: A digital image printer that performs certain digital image processing functions using parallel integrated circuitry and other functions using serial integrated circuitry in an effort to minimize integrated circuit real estate. The serial integrated circuitry is allocated to certain functions within digital image printing system that perform various mechanical operations. The inherent mechanical time constant of these mechanical operations, when compared to electrical digital image processing operations performed using modern integrated circuitry, is relatively long. In other words, the mechanical operations are performed in a relatively longer time than is made possible using modern integrated circuitry and processors employed within digital image printing systems. The present invention dedicates certain of the functions used to perform digital image processing to be performed using slower, serial integrated circuitry.
    Type: Grant
    Filed: April 1, 1999
    Date of Patent: November 28, 2000
    Assignee: Conexant Systems, Inc.
    Inventors: Chong-Hing Cheung, Hua Peng
  • Patent number: 6144127
    Abstract: An assembly is introduced which consists of an electric motor (1), an intermediate housing (2) and a control unit (3) and which is adapted for easy mounting. Such assemblies are often used in brake systems where the intermediate housing (2) receives a pump and valves. With such an assembly it is possible to control the braking pressure of the connected wheel brakes independently by predetermining the brake pedal force in accordance with suitable criteria. This assembly enables a compact structure if the motor (1) is arranged on the one side of the intermediate housing (2) and the electronic control unit (3) is arranged on the other side. Electric connection between the control unit (3) and the motor (1) is effected by a line (20) passed through channels (21,22) in respectively the intermediate housing (2) and the control unit housing (4). The cross-section of the channels (21,22) is but slightly larger than the outside diameter of the line (20).
    Type: Grant
    Filed: April 19, 1999
    Date of Patent: November 7, 2000
    Assignee: Continental Teves AG & Co. OHG
    Inventor: Andreas Heise
  • Patent number: 6144122
    Abstract: A switch assembly has a reversible switch with an activation member, electronics, and a plurality of contacts to couple the electronics with a power source. A connector assembly is coupled with the switch assembly contacts. The connector assembly includes a first one-piece connector having a circuit portion coupled with a plurality of contacts. Also, the first connector includes a terminal portion continuous with the circuit portion and connected directly with a positive terminal of the power source. A second one-piece connector has a circuit portion coupled with a second plurality of contacts. The second connector also includes a terminal portion continuous with the circuit portion and directly coupled with a negative terminal of a power source.
    Type: Grant
    Filed: March 2, 1999
    Date of Patent: November 7, 2000
    Assignee: Black & Decker Inc.
    Inventors: Kevin W. Covell, Michael R. Sell
  • Patent number: 6140729
    Abstract: An electrical machine comprises a four-pole stator 2 provided with a field winding 10 and an armature winding 11, each of the windings 10, 11 being split into two coils 22, 23 or 24, 25 closely coupled and wound so that diametrically opposite portions of both coils are disposed within diametrically opposite stator slots. A two-pole rotor (not shown) without windings is rotatable within the stator 2, and a circuit is provided for energising the armature coils 24 and 25 when direct current is supplied to terminals 26 and 27 of the circuit. Switches 28 and 29 in series with the coils 24 and 25 are switched alternately to effect alternate energisation of the coils 24 and 25 so as to generate, as a result of the opposite winding of the coils, magnetomotive forces in opposite directions.
    Type: Grant
    Filed: March 29, 1999
    Date of Patent: October 31, 2000
    Assignee: University of Warwick
    Inventors: Charles Pollock, John David Wale, Mike Barnes
  • Patent number: 6133658
    Abstract: An electric motor has a housing including a frame and first and second end shields disposed adjacent opposing ends of said frame to define a motor compartment. A stator winding is mounted on the housing within the motor compartment and includes at least first and second main windings. An armature is rotatably mounted on the housing within the motor compartment in spaced relation to the stator winding. A voltage selection switch, which is moveable between first and second positions, is mounted on the first end shield to allow the motor to be run at high or low voltage settings. The first end shield also includes a silicon-grease filled tubular seat which reduces the transfer of contaminants into the motor compartment.
    Type: Grant
    Filed: January 27, 1998
    Date of Patent: October 17, 2000
    Assignee: General Electric Company
    Inventors: Lynn Edwin Fisher, Jerry Lynn Morris
  • Patent number: 6130491
    Abstract: In a circuit-integrated motor, it is an object of the invention to solve a problem that high power output is hampered by a heated electronic component, and to provide a compact high-power motor with a self-cooling fan which is capable of affording a significant cooling effect on the electronic component and winding wire. A self cooling fan (15) disposed close to and in an opposed relation to a top face of a rotor frame (11) has a peripheral-face opening (16), and an electronic component or a radiator attached with the electronic component is located in the course of a flow passage (17) of cooling air guidedly discharged from the peripheral-face opening (16).
    Type: Grant
    Filed: July 29, 1999
    Date of Patent: October 10, 2000
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Seiji Mitamura, Haruki Kato
  • Patent number: 6130492
    Abstract: A brushless three-phase synchronous generator includes a stator having primary generating windings and stator excitation windings whose number of poles is odd-number times the number of poles of the primary generating windings. The generator further includes a cylindrical rotor on which a plurality of field windings are wound in a full-pitch concentrated winding form. The plurality of field windings are respectively short-circuited by the corresponding diodes. A plurality of field windings in which voltages of the same phase are induced based on the odd-order spatial higher harmonic magnetic fields are connected in parallel and further connected in parallel to the central field windings which effectively produce primary field magnetic fluxes. A circulating rectifier element is connected in parallel to the central field windings.
    Type: Grant
    Filed: September 16, 1998
    Date of Patent: October 10, 2000
    Assignee: Satake Corporation
    Inventors: Satoru Satake, Yukio Onogi, Kenji Inoue, Masanori Matsuda
  • Patent number: 6124550
    Abstract: The invention relates to a device for connecting to a grounding conductor the electrically conductive sheath of an electric lead laid in the slots of the inductor of a linear motor. The device is a metal shell (13), which encloses more than half the outer circumference of the lead (12) in the slot region, whose inside diameter is slightly smaller than the outside diameter of the lead (12), and which can be fastened in the respective slot (11) in a fashion lying against the inductor (10).
    Type: Grant
    Filed: October 16, 1998
    Date of Patent: September 26, 2000
    Assignees: Felton & Guillaume Kabelwerke GmbH, Thyssen-Transrapid System GmbH
    Inventors: Peter Funken, Karl-Hans Heinen, Jurgen Vogt, Hermann V. Kuepach, Friedrich Loser
  • Patent number: 6124654
    Abstract: A drive system is described that uses an electric motor and a rotary angle measuring system. The measuring system shaft is supported in roller bearings in a stator which is supported relative to the electric motor in a nonrotatable fashion by means of a stator coupling. The measuring system shaft is rigidly mounted on the end of motor shaft. The rotary angle measuring system thus assumes support of motor shaft at the B end.
    Type: Grant
    Filed: September 22, 1998
    Date of Patent: September 26, 2000
    Assignee: Max Stegmann GmbH Antriebstechnik-Eledtronik
    Inventor: Josef Siraky
  • Patent number: 6118198
    Abstract: An electric motor having a snap-together construction without the use of separate fasteners. The construction of the motor removes additive tolerances for a more accurate assembly. The motor is capable of programming and testing after final assembly and can be non-destructively disassembled for repair or modification. The motor is constructed to inhibit the ready entry of water into the motor housing and to limit the effect of any water which manages to enter the housing.
    Type: Grant
    Filed: March 25, 1999
    Date of Patent: September 12, 2000
    Assignee: General Electric Company
    Inventors: Robert K. Hollenbeck, James E. Grimm, Gregory A. Thompson
  • Patent number: 6118192
    Abstract: Devices for use in highly integrated radio frequency transceivers utilize microelectro-mechanical systems, or wobble motors, to form superior switches and to select and vary components that determine different frequencies of operation. Each device has a substrate with concentric rings of electrodes and contacts. A circular rotor is centrally pivoted or wobbled to engage the contacts along its circumferential edge. The rotor may be mechanically or materially modified to create symmetric or asymmetric forms which interact with one or more stationary capacitor electrodes on the substrate. The positioning of the rotor forms in terms of rotation, overlap and separation, relative to the capacitor electrodes, varies the capacitance.
    Type: Grant
    Filed: March 31, 1999
    Date of Patent: September 12, 2000
    Assignee: International Business Machines Corporation
    Inventor: John P. Karidis
  • Patent number: 6111330
    Abstract: An arrangement for the determination of the temperature of a direct-current motor. The temperature is determined in an indirect manner from the temperature-dependent armature resistance, with the armature resistance being determined as the quotient of the voltage being applied to and measured at the motor terminals and of the blocking current of the armature, and being set in relation to the respective temperature. The current signal determined from the current flowing within the armature is averaged with adjustable, calculated integration times with the aid of an integrator that can be controlled by a microcontroller. The arrangement, can be used for the indirect determination of the rpm rate (N) and/or variations that are critical or of interest in the rpm rate of the motor. The rpm rate is proportional to the voltage (U.sub.ind) induced within the armature, taking into consideration a motor-typical proportionality constant (.kappa.) according to equation N=.kappa. U.sub.
    Type: Grant
    Filed: May 27, 1998
    Date of Patent: August 29, 2000
    Assignee: Robert Bosch GmbH
    Inventors: Gunnar Lochmahr, Volker Aab, Gerhard Knecht
  • Patent number: 6107711
    Abstract: A rectifier assembly for use in a rotating electromagnetic machine includes an outer heat sink and an inner heat sink. The outer heat sink is configured to be connected with a diode wheel rim such that an air space is defined therebetween for cooling during rotation of the diode wheel rim. At least one rectifier element is disposed between and electrically connected with the outer heat sink and the inner heat sink. A block is disposed adjacent to the outer heat sink generally opposite the at least one rectifier element. A clamping bolt extending through the inner heat sink and the outer heat sink is threadingly engaged with the block. An electrically insulating tube is disposed around the clamping bolt. An elastomeric spacer is positioned around the clamping bolt on an end of the tube. The spacer is configured to accommodate axial stack-up tolerances of the rectifier assembly in an axial direction of the clamping bolt.
    Type: Grant
    Filed: August 21, 1998
    Date of Patent: August 22, 2000
    Assignee: Emerson Electric Co.
    Inventor: David T. Borchert
  • Patent number: 6107716
    Abstract: A housing assembly for an electrical device (such as an electronic circuit) is disclosed in which a support member is provided in a compartment to physically divide a componentry sensitive to such radiation. In a preferred embodiment, an electric power-assisted steering system is disclosed of the kind in which an electric motor (12) is connected through a gearbox to an output shaft operatively connected to a steering column of the vehicle and in which a one-piece housing (1) is provided which defines two discrete compartments (2, 3). A first compartment (3) is adapted to house the motor and the gearbox, and a second compartment (2) is adapted to house a motor control circuit and a motor drive circuit, a support member (21) being adapted to provide a physical banner between the two circuits. The one-piece housing (1) is advantageous in that it reduces the number of potential openings through which electromagnetic radiation may pass compared with providing multiple housings.
    Type: Grant
    Filed: June 8, 1999
    Date of Patent: August 22, 2000
    Assignee: TRW Lucas Varity Electric Steering Ltd.
    Inventor: David Michael Penketh
  • Patent number: 6104112
    Abstract: A compact, self contained brushless motor assembly which has a stator fixedly mounted onto a hub. Located about the stator is a rotor with a shaft being connected to the rotor which is conducted through a center through hole formed within the hub. A heat sink is attached to the hub. A controller is mounted onto the heat sink with heat generated by the controller to be dissipated by the heat sink. Rotation of the rotor causes rotation of a shaft which passes through the center through hole with this shaft to be optionally connectable to a planetary gear system. The planetary gear system is to be mounted within an alcove formed within the heat sink.
    Type: Grant
    Filed: August 19, 1999
    Date of Patent: August 15, 2000
    Inventor: Chandu R. Vanjani
  • Patent number: 6104113
    Abstract: A coil assembly for sensorless rotor angular position control of a single phase permanent magnet motor. The coil assembly is positioned axially adjacent one end of the motor's rotor core in magnetic coupling relationship with the rotor and substantially independent of the magnetic coupling relationship between the main winding of the motor's stator and rotor. The coil assembly comprises a coil of wire and a coil fixture for holding the coil of wire.
    Type: Grant
    Filed: May 14, 1998
    Date of Patent: August 15, 2000
    Assignee: General Electric Company
    Inventor: Brian L. Beifus
  • Patent number: 6100613
    Abstract: In this compact rectifier, a arcuate bodies of a positive heat sink and a arcuate body of a negative heat sink are arranged in a coaxial manner while positioning major surfaces thereof at the same plane position. A plurality of positive diodes are mounted on the major surface of the arcuate body of the positive heat sink along the circumferential direction in such a manner that leads are directed toward an outer circumferential side. On the other hand, while a plurality of negative diodes offset by a preselected amount along the circumferential direction with respect to the positive diodes with directing the lead to an inner circumferential side, these plural negative diodes are mounted on the major surface of the arcuate body of the negative heat sink.
    Type: Grant
    Filed: August 28, 1998
    Date of Patent: August 8, 2000
    Assignee: Mistubishi Denki Kabushiki Kaisha
    Inventors: Kazunori Tanaka, Katsumi Adachi
  • Patent number: 6097121
    Abstract: A spindle motor comprises a stationary member having a round mounting hole therein, a tubular member fitted into the mounting hole of the stationary member, a bearing means mounted to the inner side of the tubular member, a rotor supported by the bearing means for rotation in relation to the tubular member, a stator fitted onto the outer side of the tubular member, and a rotor magnet mounted to the rotor to be located radially and outwardly of the stator. The procedure of assembling the spindle motor includes mounting the rotor magnet to the rotor, joining the rotor by the bearing means to the tubular member for rotation, fitting the stator onto the tubular member, and fitting the tubular member into the mounting hole of the stationary member.
    Type: Grant
    Filed: July 2, 1998
    Date of Patent: August 1, 2000
    Assignee: Nidec Corporation
    Inventor: Yoshito Oku
  • 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: 6093986
    Abstract: A shaft-mounted electronic sensor with an independent, rotating power supply, and a method for powering shaft-mounted electronic sensors by harnessing the energy present in the residual magnetic fields present in the permanent magnet armature windings of a generator or motor. Windings are placed on the shaft of a rotating machine such as a synchronous motor or generator that uses a permanent magnet generator for supplying exciter field power via a regulator. These windings are placed such that they rotate with the shaft and break the lines of flux produced in the permanent magnet stationary armature windings. Breaking the lines of flux induces a current in the windings of the invention which is used to power an electronic sensor mounted on the shaft.
    Type: Grant
    Filed: March 8, 1999
    Date of Patent: July 25, 2000
    Assignee: Emerson Electric Co.
    Inventor: Allen Windhorn
  • Patent number: 6091174
    Abstract: A motor and pump assembly in which the circulating liquid from the pump passes through the motor and in which the motor housing has an outer shell closed at its end remote from the pump by a metal cover having an inwardly-extending annular collar fitting against an inner side of the outer shell for heat transfer thereto. A heat-generating electronic component such as a frequency converter is mounted directly on an inner side of the cover.
    Type: Grant
    Filed: December 17, 1998
    Date of Patent: July 18, 2000
    Assignee: Wilo GmbH
    Inventor: Albert Genster
  • Patent number: 6091220
    Abstract: In an electric motor, a Hall sensor (3) is arranged in the vicinity of the outer circumference of the rotor (2) and of at least one of the permanent magnets (4-7) provided for operationally exciting the electric motor. At least one of the permanent magnets (4-7) is provided for generating the magnetic field inducing the Hall sensor (3). The rotor (2) has rotor teeth (2.1) and/or rotor slots (2.2) on the air-gap side and, in operation, produces magnetic field pulsations in proportion to the rotor speed.
    Type: Grant
    Filed: March 19, 1998
    Date of Patent: July 18, 2000
    Assignee: Siemens Aktiengesellschaft
    Inventor: Harald Redelberger
  • Patent number: 6081056
    Abstract: The invention relates to a motor which comprises a drive system which has a stator (10) and a rotor (14), and a control system which controls the drive system and has circuit boards (21), (22), both being housed in a casing (2), wherein the casing (2) has a first conductive pin (25) for flowing a current to input power to the control system and a second conductive pin (26) for flowing a current to output from the control system to respective phases of a coil, and the circuit boards are supported by the first and second conductive pins. And, the invention relates to a method of manufacturing a motor which comprises the steps of using a first die (101) and a second die (102) which are mutually connected with a die split face (104) therebetween and a third die (103) which is inserted in the middle of the first and second dies, inserting and fixing a motor stator, a metallic cylinder and embedding members into a cavity formed by the first, second and third dies, and pouring a molten resin to effect resin molding.
    Type: Grant
    Filed: June 23, 1998
    Date of Patent: June 27, 2000
    Assignee: Seiko Epson Corporation
    Inventors: Kunihiko Takagi, Michio Sato, Akiyoshi Ishiguro, Kunio Tabata, Osamu Shinkawa
  • Patent number: 6078117
    Abstract: An end cap assembly is configured as an electronic conducted noise filter and/or radiated field shield for incorporation as the end cap of a motor housing case as original equipment. The assembly includes a conductive panel having conductive members which interconnect discrete electrical components of a filter network array. Alternatively, various types of printed circuit boards, wireframe assemblies, wirewrap assemblies, and lead frame assemblies may be used. These assemblies include the conductive members which are held in position within an electrically insulative component member or housing of the end cap assembly by such means as insertion of tabs into captivating slots, insert overmolding, encapsulation, heat staking, mechanical., fasteners, and/or adhesives.
    Type: Grant
    Filed: January 22, 1999
    Date of Patent: June 20, 2000
    Assignee: Nartron Corporation
    Inventors: Randall L. Perrin, John M. Washeleski, Peter H. Strom
  • Patent number: 6069426
    Abstract: A godet for guiding and advancing a yarn with a rotating godet jacket. The godet jacket is mounted to a rotor shaft, which is driven by means of a three-phase motor. The three-phase motor is controlled via a frequency inverter, which is mounted in a housing, whose interior accommodates the electronic subassemblies of the frequency inverter in a stationary and heat transferring manner. The housing of the frequency inverter is firmly connected to the housing of the three-phase motor.
    Type: Grant
    Filed: August 17, 1999
    Date of Patent: May 30, 2000
    Assignee: Barmag AG
    Inventors: Uwe Baader, Frank Springmeier
  • Patent number: 6061247
    Abstract: The present invention includes a motor body and provided to this motor body a motor with attached control device having a control device which drives this motor body, wherein the capacitor attached to the control device of this motor with attached control device is provided with a freely attachable and removable mounting device. According to the present invention, the attachment and removal of the capacitor of the control device which requires relatively frequent replacement can be performed freely, enabling the replacement to be performed simply.
    Type: Grant
    Filed: March 27, 1998
    Date of Patent: May 9, 2000
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Takashi Nishizawa, Motoyasu Mochizuki, Yoshinobu Nakamura, Youichi Morishima, Yasuo Hirano
  • Patent number: 6057615
    Abstract: A bracket for attaching a capacitor with an engagement portion to a motor having therein a keyhole with a rectangular portion and a circular portion. The bracket includes a first semicylindrical member having a first downwardly extending portion and a first hinge portion and a second semicylindrical member having a second downwardly extending portion and a second hinge portion. The first hinge portion and second hinge portion are engageable to form a hinge with an axis about which the semicylindrical members are pivotable to open and closed positions. When in the open position, the semicylindrical members permit the capacitor to be removed from the bracket. When in the closed position, the semicylindrical members define a cylinder having an axis and including a capacitor engagement portion for engaging the capacitor, thereby retaining the capacitor in the bracket.
    Type: Grant
    Filed: July 30, 1999
    Date of Patent: May 2, 2000
    Assignee: A. O. Smith Corporation
    Inventor: Norman R. Long
  • Patent number: 6057614
    Abstract: A device (1) for switching electromagnetic equipment. It is especially intended for switching a direct-current brake for a three-phase motor (3) with a switching contact (6) with a rectifier (7) with integrated protective circuitry downstream of the switching contact. There is current transformer (5) upstream of the switching contact. The transformer's primary winding is part of a conductor in the line that provides a voltage.
    Type: Grant
    Filed: July 15, 1998
    Date of Patent: May 2, 2000
    Assignee: Flender-Himmelwerk GmbH
    Inventors: Klaus Mayer, Ottmar Ziepel, Bernd Strauss
  • Patent number: 6049149
    Abstract: A brushless DC motor includes opposed pairs of axial magnetic field type permanent-magnets. Two opposed stators are axially arranged at two opposite sides of a rotor, each and stator includes a plurality of equiangularly spaced electromagnetic zones and in least one winding at each electromagnetic zone. A control system is provided to detect phase angle and the revolving speed of the rotor through a sensor and to control the connection of DC current to each winding and its direction, enabling the windings in the electromagnetic zones to form with the rotor at least one motor. By means of detecting speed change of the rotor through the sensor, the control system controls the opposed pairs of axial magnetic field type permanent-magnet brushless DC motor to operate under different motor operation combinations and to output different torques.
    Type: Grant
    Filed: March 23, 1999
    Date of Patent: April 11, 2000
    Inventors: Shou-Mei Lin, Yu-Yen Wang
  • Patent number: 6037692
    Abstract: A high power low RPM direct current electric motor is disclosed whereby the high power output is achieved in one of two ways or both. In the first case, the need for cooling is reduced simultaneously along with an increase in the utilization of the magnetic field present in the motor permanent magnets. This is achieved by wrapping the electromagnet core with windings that are capable of demagnetizing the rotor permanent magnets under stall conditions. Interlocking motor circuitry is provided which prevents the full activation of these motor windings until motor RPM values reach a safe level. This increases motor power while decreasing resistive losses in electromagnet windings. In the second case, the rotary portion consists of a large diameter relatively flat rotor containing permanent magnets and having built in vanes for moving air over the electromagnet stator windings providing forced air cooling.
    Type: Grant
    Filed: June 1, 1998
    Date of Patent: March 14, 2000
  • Patent number: 6037686
    Abstract: Each torque-producing phase current of a multi-phase motor is passed through a filter which includes an R/C shunt to ground and a series, current-compensated choke. Each choke has a winding in series with each phase so that the net current generated by phase currents in the windings is zero, and therefore the net flux generated by phase currents in the highly permeable core of the choke is zero at all times. However, there is significant inductive reactance created by the non-counterbalanced motor leakage currents, which prevent leakage currents from circulating through the motor. Thus, torque-producing motor currents can accurately be measured for feedback, without pollution from leakage currents. LEM current transducers allow use of small, proportional currents in the measuring and suppress inter-phase coupling.
    Type: Grant
    Filed: February 9, 1999
    Date of Patent: March 14, 2000
    Assignee: Otis Elevator Company
    Inventors: Uwe Schonauer, Robert Oesterle, Christoph M. Ernecke
  • Patent number: 6037693
    Abstract: A commutator motor has at least two supply terminals; a metallic pole tube, and an interference suppressing device, the pole tube being formed as a part of the interference suppressing device.
    Type: Grant
    Filed: January 20, 1999
    Date of Patent: March 14, 2000
    Assignee: Robert Bosch GmbH
    Inventors: Detlef Marth, Johann Rothkopf, Luciano Zorzin, Wolfgang Pfaff, Dirk Arnold
  • Patent number: 6034453
    Abstract: A motor having a fluid bearing in which a clearance control unit is provided in a housing so as to stably rotate a rotor shaft of a rotor by controlling a clearance between the rotor shaft and a shaft groove. The clearance control unit includes a clearance control rod inserted into a through hole which passes through the shaft groove from an external side of the housing, and a feed gear for feeding the clearance control rod. One end of the feed gear is rotatably mounted into one end of a groove formed to be connected with the through hole, and the other end of the feed gear is formed to fit a feed screw exposed to the external side of the housing into a screw hole. The feed gear moves the clearance control rod closer to the rotor shaft, causing an increased air pressure between the clearance control rod and the rotor shaft for moving the rotor shaft into center alignment in the shaft groove.
    Type: Grant
    Filed: February 12, 1998
    Date of Patent: March 7, 2000
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jae-yong Eom, Seung-gon Kim
  • Patent number: 6028381
    Abstract: Between a relay terminal of a direct current motor and a contact terminal of an electromagnetic switch, there is provided a fuse which is melted to cut off an electric current upon reaching a predetermined temperature. By properly setting the predetermined temperature at which the fuse melts, it is possible to make the fuse heated to a high temperature and melted in a relatively short time to cut off the electric current in the event of, for example, a continuous operative condition caused due to such a failure as fusion adhesion of a movable contact point with a B-terminal and an M-terminal or fusion adhesion of a contact point mechanism outside a starter, or an overcurrent supply condition caused upon a rotor being locked.
    Type: Grant
    Filed: January 31, 1997
    Date of Patent: February 22, 2000
    Assignee: Hitachi, Ltd.
    Inventors: Shigeru Yumiyama, Rikio Goto, Naoki Sumiya, Norikazu Sanuga, Atsushi Saeki
  • Patent number: 6023117
    Abstract: A motor device secured by an engaging element includes a frame, a bushing having a first bushing engaging element at one end thereof and connected to the frame at the other end thereof having a second bushing engaging element thereof, a stator sleeved on the bushing, a printed circuit board (PCB) arranged between the stator and the frame and sleeved on the bushing, a first fixing unit cooperating with the frame to position therebetween the stator, and having a first fixing engaging element engaging with the first bushing engaging element for securing the stator to the bushing, and a second fixing unit cooperating with the frame to position therebetween the PCB, and having a second fixing engaging element engaging with the second bushing engaging element for positioning the PCB with the bushing. The motor device further includes a shafted case having a case engaging element, coaxially mounted in the frame, and having a rotatable shaft.
    Type: Grant
    Filed: November 20, 1998
    Date of Patent: February 8, 2000
    Assignee: Delta Electronics, Incorporated
    Inventor: Chang-Shun Chen
  • Patent number: 6020660
    Abstract: A dynamoelectric machine includes a stator having a stator core. A winding is provided on the stator core and the stator core has a stator bore. A rotor including a rotor core is received in the stator bore. A permanent magnet is mounted on the rotor core periphery and a rotor shaft is mounted on the rotor core. Bearing means are provided for supporting the rotor shaft for rotation relative to the stator. A first circuit board having electrical components thereon is used in operating the dynamoelectric machine, and a second circuit board having an electrical component in the form of a sensing device thereon is used in determining the position of the rotor. The first circuit board is constructed for mounting the second circuit board thereon so that the second circuit board projects axially inwardly from the first circuit board and the sensing device is disposed in an axial position overlapping the axial position of the permanent magnet.
    Type: Grant
    Filed: December 10, 1997
    Date of Patent: February 1, 2000
    Assignee: General Electric Company
    Inventor: Kamron M. Wright
  • Patent number: 6008555
    Abstract: An electric motor includes a stator assembly having an annular stator core with an inner diameter and an outer diameter. The inner diameter is formed with a plurality of winding slots extending from a first end of the stator core to a second end of the stator core. A plurality of windings are disposed within the winding slots beginning with a first slots. The windings are coupled into at least one winding group associated with at least a first phase, and each winding has a first winding end and a second winding end extending from the first end and the second end, respectively, of the stator core. At least one thermal fuse is disposed in thermal contact with the first winding end and substantially adjacent to the first winding portion.
    Type: Grant
    Filed: December 17, 1998
    Date of Patent: December 28, 1999
    Inventors: Keith E. Garr, Larry J. Kintz, Jr., Denise L. LoFasto, Alida I. Santana, Wilfredo E. Colon, Ricardo Jusino
  • Patent number: 6005314
    Abstract: Systems and apparatus for integrating an air switch and a power cord into an electric motor, and methods for assembling an electric motor including an integral air switch and an integral power cord, are described. In one embodiment, an air switch and a power cord are incorporated into an electric motor. No additional removable cover is required for the switch and cord. To eliminate the motor centrifugal switch, an air switch is provided to control energization and de-energization of the motor windings. The air switch includes a snap action switch to cut-out the start winding used for ensuring that the rotor has sufficient starting torque.
    Type: Grant
    Filed: March 13, 1998
    Date of Patent: December 21, 1999
    Assignee: General Electric Company
    Inventors: Lynn Edwin Fisher, Jeannette Ann McLean, James Victor Yu
  • Patent number: 6005324
    Abstract: A brushless motor has a housing including an upper housing and a lower housing;a P.C.B. installed in the upper housing, a stator provided at an underside of the P.C.B., the stator having a plurality of coil layers piled up with each other and insulation layers interposed between coil layers, the coil layers being electrically connected to each other by a conductance member for generating an electric field, a rotor having permanent magnets which are radially disposed on an upper surface of the rotor in such a manner that adjacent permanent magnets have different poles from each other to generate a magnetic field which makes electromagnetic-interaction with the electric field of the stator to rotate the rotor, and a rotating shaft integrally formed at a center of the rotor so as to rotate when the rotator rotates. The brushless motor is advantageous in that since the coil is uniformly patterned, the magnetic field is uniformly generated.
    Type: Grant
    Filed: June 25, 1998
    Date of Patent: December 21, 1999
    Assignee: Daewoo Electronics Co., Ltd.
    Inventor: Hyung-Cheol Kim
  • Patent number: 6005322
    Abstract: This invention relates to a novel design of electric motor wherein a fuel cell with an electrical output is integrated with a cylindrical type monopole (homopole) electric DC motor. Power is supplied to an output shaft by the introduction of reactants to the fuel cell. The fuel cell is positioned within and rotates with the rotor of the cylindrical type monopole (homopole) DC motor. This novel compact combination of a fuel cell and a cylindrical form of monopole (homopole) electrical DC motor enables the combination to fit within a confined space.
    Type: Grant
    Filed: April 8, 1998
    Date of Patent: December 21, 1999
    Inventors: Mark Frank Isaak, Daniel Molleker
  • Patent number: 6005315
    Abstract: A fault-tolerant control system for a magnetic bearing arrangement which maximizes dynamic response of the control system is disclosed. The arrangement includes a main digital signal processor responsive to rotor position/velocity signals to supply control signals to bearing control coils and a secondary digital signal processor responsive to accelerometer signals to provide open-loop vibration control for correction of mass imbalance of the rotor system. In addition, sources of vibration which have fundamental frequencies at some multiple of the rotor system rotational frequency can also be controlled.
    Type: Grant
    Filed: June 3, 1998
    Date of Patent: December 21, 1999
    Assignee: Electric Boat Corporation
    Inventor: John H. Chapman
  • Patent number: 6002188
    Abstract: In a bearing arrangement including a thrust bearing and a radial bearing, the thrust bearing includes a first thrust plate which is fixedly secured to a stator plate, and the radial bearing is integrally attached to the first thrust plate of the thrust bearing. Because the radial bearing is directly attached to the first thrust plate of the thrust bearing, the perpendicularity of the radial bearing with respect to the thrust support surface can be easily ensured. Also, the first thrust plate normally consists of a highly rigid member, and this also contributes in the favorable perpendicularity of the radial bearing with respect to the thrust support surface. This bearing arrangement is useful in a spindle motor for turning a floppy disk in a floppy disk drive.
    Type: Grant
    Filed: May 14, 1998
    Date of Patent: December 14, 1999
    Assignees: Sanyo Electric Co., Ltd., Kumagaya Seimitsu Co., Ltd.
    Inventor: Toshiharu Yagi
  • Patent number: 6002192
    Abstract: A drive unit for transport devices comprises a spindle (1) with a stator (2) and, mounted on said spindle so as to be capable of rotation, a rotor (3), all these elements forming an electric motor (4) and a rim (5). The device is provided with permanent magnets (6, 7, 8, 9), cores (10) with coils (11), and sensors (12) for determining the angular position of the rotor (3). The rotor (3) is designed as concentric shells (13,14) and joined to the rim (5). The permanent magnets (6, 7, 8, 9) are mounted on the sleeves (13, 14), each magnet facing another magnet of opposite polarity; on each sleeve (13, 14) permanent magnets (6, 7, 8, 9) are mounted so that their polarity alternates. The stator (2) is located between the permanent magnets (6, 7, 8, 9) and carries the coils (11) with cores (10), the coils being connected around the periphery to the stator (2) and arranged with gaps between themselves and the permanent magnets (6, 7, 8, 9).
    Type: Grant
    Filed: August 8, 1997
    Date of Patent: December 14, 1999
    Assignee: Antares High Tech S.A.
    Inventors: Yuri Prokopevich Krivospitski, Alexei Phedorovich Avdonin, Sergei Ivanovich Mashurov, Leonid Stepanovich Truphanov, Oleg Grigorievich Dashko, Anatoliy Anatolievich Atrushkevich, Vladimir Ivanovich Kutyanin
  • Patent number: 5998891
    Abstract: The present invention relates to a replacement alternator constructed to replace an existing CS-130 alternator in a vehicle where the CS-130 alternator was disposed in a predetermined alternator space within the vehicle. The alternator space has a predetermined length, width and height. The alternator comprises a housing defining an alternator interior space. The housing is sized to fit within the predetermined alternator space. A rotor coil having a plurality of wire windings wound thereabout is disposed in the alternator interior space of the housing and rotatably supported by the housing. The wire windings of the rotor coil have an electrical current flowing therethrough for generating a rotating magnetic field as the rotor coil rotates. Means are provided for selectively rotating the rotor coil at a speed of at least 1600 revolutions per minute. The alternator includes a stator positioned in the rotating magnetic field generated by the rotor coil and supported by the housing.
    Type: Grant
    Filed: August 19, 1997
    Date of Patent: December 7, 1999
    Assignee: Unit Parts Company
    Inventors: Jianing Chen, Michael D. Ballard
  • Patent number: 5996209
    Abstract: A dynamoelectric machine has a stator end cap mounted on a stator core, which attaches a control circuit board directly onto the stator. The end cap has integrally formed fingers which permit snap on connection of the circuit board. Guide pins make certain the circuit board is oriented properly upon connection to the end cap. The end cap also has wire fixtures which hold winding leads of a winding and permit insulation displacement terminals on the circuit board to plug into the winding leads and achieve electrical contact at the same time the circuit board is mounted on the end cap. Hall devices mounted onto the circuit board are guided into pockets formed on teeth of the stator end cap for precise location. The end cap is constructed to shield the winding from contact with the motor shell. In addition, backward curved fans are employed to reduce mechanical noise in the direction of high speed rotation.
    Type: Grant
    Filed: February 23, 1999
    Date of Patent: December 7, 1999
    Assignee: General Electric Company
    Inventors: David T. Molnar, Robert K. Hollenbeck
  • Patent number: 5998893
    Abstract: An integral heat sink and fan rectifier assembly comprises a disk fastened to a rotor of a synchronous motor or generator, the disk having a central bore, a plurality of fan blades disposed on the outer periphery and a circular array of recesses that receive insulation encapsulated rectifier units that are fastened to the disk and a have a heat transfer plates that engage the bottom of the recesses to transfer heat to the disk which conducts the transferred heat to the fan blades, which transfer the heat to the cooling air as rotor rotates and blows cooling air through a portion of the motor or generator.
    Type: Grant
    Filed: December 3, 1998
    Date of Patent: December 7, 1999
    Inventors: John T. Fowler, Darrell R. Morrison
  • Patent number: 5979087
    Abstract: An electromechanical machine includes a stator fixed with respect to a housing structure and a rotor fixed with respect to a driven shaft. The stator includes a magnetically permeable core having a plurality of parallel winding slots containing conductive windings. Coilheads are located at opposite axial ends of the magnetically permeable core where the windings turn to extend down a parallel winding slot. The motor is equipped with electrostatic shield arrangements in the winding slots and coilheads to reduce capacitive coupling between the stator and rotor during operation.
    Type: Grant
    Filed: January 16, 1998
    Date of Patent: November 9, 1999
    Assignee: Reliance Electric Industrial Company
    Inventors: Sidney Bell, Michael J. Melfi, Stanley E. Wallace