Patents Examined by David Martin
  • Patent number: 7034481
    Abstract: To provide a power transmission device that can increase the range of speed variation between an engine and a power output shaft and effectively achieve reduction in size and cost of the device arrangement. The speed reduction ratios from an engine 1 to first output shaft 4c, 5c of first and second power distributors 4, 5 are different from each other. A speed change unit 10 is provided between the first output shaft 4c of the first power distributor 4 and a power output shaft 11 linked with driving wheels 2, 2 of the vehicle, and rotation transmission therebetween is achieved at a plurality of stages of speed reduction ratio. The rotation transmission from the first output shaft 5c of the second power distributor 5 to the power output shaft 11 is achieved via gears 20, 15b or rotation transmission mechanisms 15, 14 of a speed change unit 10 at a plurality of stages of speed reduction ratio.
    Type: Grant
    Filed: June 7, 2004
    Date of Patent: April 25, 2006
    Assignee: Honda Motor Co., Ltd.
    Inventor: Nobuyuki Imai
  • Patent number: 7034490
    Abstract: A Hard Disk Drive VCM positioning servo loop comprises an oversampling bitstream Digital to Analog converter. The oversampling DAC is a sigma-delta converter which yields higher resolution and lower noise than Nyquist-rate DACs. This allows driving the VCM with finer level of current control for higher track density. This approach can be implemented in the VCM driver chip (“combo chip”) or in the microprocessor device either in hardware or in software, reducing significantly the development and manufacturing cost. Furthermore this approach can be utilized in combination with a VCM actuation method known as “voltage mode drive” wherein the output of the sigma-delta converter represents the voltage to be applied directly to the VCM actuator. Furthermore this approach can be utilized for optical data storage motor positioning servo loops or any other motor positioning servo loops where high dynamic and resolution is needed.
    Type: Grant
    Filed: April 2, 2004
    Date of Patent: April 25, 2006
    Assignee: Acutechnology Semiconductor
    Inventors: Carl K. Sawtell, Paolo Menegoli
  • Patent number: 7034480
    Abstract: A method for reducing engine fuel consumption of an electro-motive vehicle during braking, the method including steps for providing an engine for the vehicle, generating primary electric power at a primary electric power generator connected to the engine, generating primary electric power at a secondary electric power generator connected to the engine, operating a plurality of electric traction motors each coupled in driving relationship to a respective one of a plurality of driven wheels to propel the vehicle during motoring operations and to generate electricity upon braking operations of the vehicle, electrically connecting a braking switch between the traction motors and the primary electric power generator, applying braking, closing the braking switch, and transmitting power generated by the traction motors to the primary electric power generator to operate as a motor to rotate the engine and drive the secondary electric power generator to power the auxiliary equipment without fueling the engine.
    Type: Grant
    Filed: September 2, 2004
    Date of Patent: April 25, 2006
    Inventors: Ajith Kuttannair Kumar, Peter Loring Valentine
  • Patent number: 7030587
    Abstract: A system for controlling a switch reluctance machine is provided. The system includes multiple phases located in the switch reluctance machine, each phase having multiple machine coils. Each machine coil is independently connected to a positive side switch circuit and a negative side switch circuit. Each positive side switch circuit is in electrical parallel connection with the other positive side switch circuits, and configured to control the flow of current through the machine coil to which it is connected. Similarly, the negative side switch circuits are connected in electrical parallel and configured to control the flow of current through the machine coil to which they are connected. The positive side and negative side switch circuits may be provided in a buck boost configuration or two half bridge configurations.
    Type: Grant
    Filed: April 9, 2004
    Date of Patent: April 18, 2006
    Assignee: Visteon Global Technologies, Inc.
    Inventors: Mohammad N. Anwar, Mehrdad Teimor, Daryl A. Wilson, Paul F. Turnbull, William Turnbull
  • Patent number: 7030305
    Abstract: An electronic synthesized steelpan drum resembling a conventional steelpan drum and featuring the same shallow cylindrical shape with a sunken concave playing surface. The steelpan drum includes a central processor chip and associated memory chips for providing a variety of synthesized steelpan and a full range of musical, orchestral, and symphonic instrumental sounds, including tenor, double-seconds, guitar, cello, quadraphonic, tenor-bass, and bass steel drums. The concave playing surface is comprised of a series of rubber striking pad areas, which can be arranged in a conventional or other unique pattern typical of a tenor pan. The striking pad areas will be played with a pair of pansticks. Attached under each pad is a pressure sensor, which will detect the amount of force applied when a pannist strikes a pad and provide a signal to the central processor for controlling the synthesized sound.
    Type: Grant
    Filed: February 6, 2004
    Date of Patent: April 18, 2006
    Inventor: Salmon Cupid
  • Patent number: 7030589
    Abstract: An AC motor control apparatus that is applicable to commonly used PM motors and capable of detecting the magnetic pole position with simple algorithm. The AC motor control apparatus comprises an inverter for applying arbitrary AC power to an AC motor and a controller for sending a control signal to the inverter. The controller comprises a ripple current generator for supplying a ripple current to the AC motor and a magnetic pole position estimator. The magnetic pole position estimator observes at least two current values of the ripple current for both positive and negative sides of the ripple current to estimate the magnetic pole position of the AC motor.
    Type: Grant
    Filed: February 27, 2004
    Date of Patent: April 18, 2006
    Assignee: Hitachi Industrial Equipment Systems Co., Ltd.
    Inventors: Daigo Kaneko, Yoshitaka Iwaji, Kiyoshi Sakamoto, Tsunehiro Endo, Tomofumi Okubo
  • Patent number: 7030580
    Abstract: A transient response system includes a power source operable to generate a power output and a transmission operatively coupled to the power source. The transient response system also includes a generator operatively coupled to the power source and a controller in communication with the generator and at least one of the power source and the transmission. The controller is operable to receive at least one input having a value indicative of a change in load on the power source and operable to cause the generator to remove power from the power output at a rate corresponding to the value of the at least one input.
    Type: Grant
    Filed: December 22, 2003
    Date of Patent: April 18, 2006
    Assignee: Caterpillar Inc.
    Inventor: Brian D. Hoff
  • Patent number: 7030585
    Abstract: A controller capable of preventing response delay and generation of vibrations attributable thereto during position control of a movable part of a machine having low rigidity. A motor for driving a machine having low rigidity is subjected to position and velocity loop control. Compensation amount Q1 proportional to command velocity obtained by differentiating a position command and compensation amount Q2 proportional to second-order differentiated command acceleration are obtained. Compensation amounts Q1 and Q2 are added together, thus obtaining a velocity offset amount Vof corresponding to a estimated torsion amount. A differentiated value of the velocity offset amount is multiplied by coefficient ? to obtain a torque offset amount Tof. The velocity offset amount Vof is added to a velocity command Vcs obtained by position loop control 1. The torque offset amount Tof is added to a torque command Tc outputted in velocity loop control 2, and the result is used as a drive command to the motor.
    Type: Grant
    Filed: January 7, 2004
    Date of Patent: April 18, 2006
    Assignee: Fanuc LTD
    Inventors: Yasusuke Iwashita, Hiroyuki Kawamura
  • Patent number: 7030584
    Abstract: A control circuit is described in which a single input terminal receives digital control signals and analog control signals. A circuit coupled to the single input provides a first output to indicate that a signal at said single input terminal is a digital signal and a second output indicates that a signal at said single input terminal is an analog signal.
    Type: Grant
    Filed: November 10, 2004
    Date of Patent: April 18, 2006
    Assignee: Andigilog, Inc.
    Inventor: Jade H. Alberkrack
  • Patent number: 7026771
    Abstract: A microprocessor of the motor control apparatus acquires a zero-cross detection signal from a zero-cross detection section and a load current from a current detection section at a prescribed sampling period. The processor obtains a load current instant value every sampling period and a corresponding sine-functional value from a sine-functional value table to calculate a compensation value for the load current instant value. The processor also calculates a load current compensation total value by adding the compensation value by the predetermined number of times of sampling and compares the load current compensation total value with a load current reference value to obtain a difference therebetween. In response to the difference, an instruction value for delay time that determines the output timing of a trigger signal to a switching element is changed so that power consumption of the motor falls within a prescribed range.
    Type: Grant
    Filed: May 9, 2005
    Date of Patent: April 11, 2006
    Assignee: Toshiba Tec Kabushiki Kaisha
    Inventors: Hiroyuki Kushida, Osamu Sakurai, Akihiro Ishizawa
  • Patent number: 7023152
    Abstract: A driving control device for an actuator comprises a driving device to drive an actuator having an electric motor (30) and a driving control device (50) to control the rotation of the electric motor (30) by controlling the driving device. The driving control device includes an H bridge circuit constructed by four switching semiconductor elements (Tr1 to Tr4), and rotates the electric motor in normal and reverse directions by turning on and turning off the switching semiconductor elements (Tr1 to Tr4). The driving control device (50) conducts to activate and to stop the electric motor (30) by applying a PWM signal to the switching semiconductor elements (Tr3 and Tr4) constructing the lower arm of the H bridge circuit (51).
    Type: Grant
    Filed: December 23, 2003
    Date of Patent: April 4, 2006
    Assignee: Calsonic Kansei Corporation
    Inventors: Hideki Sunaga, Kaoru Tanaka, Futoshi Araki, Eiji Takahashi
  • Patent number: 7023168
    Abstract: A control system for an electric machine includes a flux weakening module, which includes a voltage magnitude calculator that receives d-axis and q-axis command voltages and that generates a voltage magnitude. An error circuit compares the voltage magnitude to a reference voltage and generates an error signal. A controller receives the error signal and generates a feedback flux correction signal. A limiter limits the feedback flux correction signal to a predetermined flux value and generates a limited feedback flux correction signal. A feedforward stator flux generating circuit generates a feedforward stator flux signal. A summing circuit sums the feedforward stator flux signal and the limited feedback flux correction signal to generate a final stator flux command.
    Type: Grant
    Filed: September 13, 2004
    Date of Patent: April 4, 2006
    Assignee: General Motors Corporation
    Inventors: Nitinkumar R. Patel, Steven E. Schulz, Seung Ki Sul, Bon-Ho Bae
  • Patent number: 7023172
    Abstract: An electric motor control apparatus of this invention estimates changes in temperature of a semiconductor device to compute temperature change amplitude 108 based on an output current signal 105 computed from a current flowing through the semiconductor device of a switching circuit 5, an operating frequency signal and a carrier frequency signal by a temperature change estimation part 11, and makes conversion into the number of power cycles 110 corresponding to the temperature change amplitude 108 from power cycle curve data stored in a power cycle curve data storage part 14 and computes a thermal stress signal 111 by a thermal stress computation part 13, and does life estimation of the semiconductor device based on the thermal stress signal 111 and produces an output to a display part 16 as a life estimation result signal 112 by a life estimation part 15a.
    Type: Grant
    Filed: March 12, 2003
    Date of Patent: April 4, 2006
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Masanori Katou
  • Patent number: 7022908
    Abstract: A pick-up assembly for a stringed musical instrument includes first and second identical pick-ups in respective housings. The first pick-up is positioned toward strings of the instrument and the second pick-up is positioned toward inside of the instrument. The first and second pick-ups are attached back to back with a hard rubber sound suppressing material sandwiched between the back of the two housings. The sound suppressing material has the same size as the back of the housing. The second pick-up is grounded with a metal wire or is tuned to zero amplication.
    Type: Grant
    Filed: June 17, 2002
    Date of Patent: April 4, 2006
    Assignee: Hogue Family Foundation
    Inventors: Larry J. Hogue, John H. Hogue
  • Patent number: 7023160
    Abstract: A method for operating a doubly-fed machine by determining its rotational speed (nact), forming a rotational speed reference (nref), measuring network voltage and current, and calculating network active power (Pact) and reactive power (Qact). Thereafter, calculating shaft torque (T) based on active power (Pact) and rotating speed (nact), forming a frequency reference (Fref) for the inverter based on machine rotating speed (nact), rotating speed reference (nref), shaft torque (T), and the known pole pair number and network frequency, forming a reactive power reference (Qref) for the machine.
    Type: Grant
    Filed: January 26, 2005
    Date of Patent: April 4, 2006
    Assignee: ABB Oy
    Inventors: Reijo Virtanen, Osmo Pasuri
  • Patent number: 7023150
    Abstract: A hybrid drive apparatus includes an engine, a first electric motor for generating electric power by using at least a portion of its output and for controlling the speed of the engine and a control unit for controlling the engine and the first electric motor. The control unit performs a prepositioning control for positioning the engine being fuel-cut to a predetermined cranking start position such as a constant crank angle position or a constant cranking load position by the motoring of the first electric motor. As a result, the engine can always be started under identical conditions, and the torque vibrations to be outputted to a wheel have identical waveforms so that a simple torque correction can be made by outputting corresponding waveform data.
    Type: Grant
    Filed: July 11, 2001
    Date of Patent: April 4, 2006
    Assignee: Aisin AW Co., Ltd.
    Inventors: Hideki Hisada, Kazuo Aoki, Hiroyuki Kojima
  • Patent number: 7019202
    Abstract: An acoustic guitar having a reverberating bridge assembly mounted onto the body of the guitar for re-echoing and reverberating the sounds produced by the strings of the guitar, in order to increase the range of sound effects that the guitar is capable of producing. The reverberating bridge assembly comprises a tailpiece having a transverse crevice, a U-shaped tube support positioned within the crevice, and a hollow cylindrical tube supported upon the U-shaped tube support. The strings of the guitar press upon the cylindrical tube. When a player plucks the strings, vibrations of the strings reverberate within the tube, and are transmitted therefrom to the U-shaped tube support, the tailpiece, and then to the body of the guitar. The reverberating bridge assembly produces sound having a delightful reverberating quality.
    Type: Grant
    Filed: June 14, 2004
    Date of Patent: March 28, 2006
    Inventor: Robert Hetzel
  • Patent number: 7019481
    Abstract: A carriage driving apparatus that drives a carriage of a printer or the like by a motor and a motor control method for controlling the motor can substantially eliminate variation in control accuracy among individual apparatuses. Each set of various parameters are determined with respect to each ultimate target speed of the carriage and each moving direction, and contained in a table. Three kinds of tables, i.e. a table for heavy load, a table for light load and a table for standard load in accordance with the difference in load applied to individual drive systems of the carriage, as well as one kind of table for low temperature are prepared and stored on a ROM. It is determined which of the three kinds of tables should be selected at normal temperature by actually driving the carriage in the final step of the manufacturing process.
    Type: Grant
    Filed: January 30, 2004
    Date of Patent: March 28, 2006
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventors: Shinya Kato, Daisuke Kozaki
  • Patent number: 7015670
    Abstract: The invention provides a method for controlling an electromechanical servomechanism (20) for moving an output member relative to a variable load (38). The servomechanism includes: a motor (37) having at least one coil (32A, 32B or 32C) adapted to be supplied with current and having a rotor (33) with an output shaft (35); a mechanical transmission (36) arranged between the output shaft and the load, the transmission having a mechanical friction related to the load; a servoamplifier (30) arranged to supply current to the motor coil in response to an input signal (in line 29); a command signal (in line 21) for commanding the position of the load; a load position feedback signal (in line 23) compared (in summing point 22) to the command signal and arranged to produce an error signal (in line 24); and means (28) for generating an offset signal (in line 26) that is summed (in summing point 25) with the error signal to modify the servoamplifier input signal (in line 29).
    Type: Grant
    Filed: May 14, 2004
    Date of Patent: March 21, 2006
    Assignee: Moog Inc.
    Inventor: Eric A. Polcuch
  • Patent number: 7015390
    Abstract: A removable and portable single pickup unit for stringed instruments such as guitars, and the like. The unit can be mounted inside of a sound hole of an acoustic guitar without damaging the guitar. The unit can combine inputs from three different pickups(such as a magnetic sensor, vibratory transducer, and a microphone) into a single small housing. The unit can include a pre-amplifier and circuitry within the unit along with three rotatable rheostat type control knobs for each of the pickups, and an overall volume control knob that are easily reachable to the user's fingers while the fingers are on the strings. An output cable connects the unit to a single external amplifier or three individual amplifiers for each of the three different pickups.
    Type: Grant
    Filed: January 15, 2004
    Date of Patent: March 21, 2006
    Inventor: Wayne A. Rogers