With Synchro Differential Patents (Class 318/655)
  • Patent number: 7969110
    Abstract: The invention relates to an actuator having an (auto)synchronous rotary electric motor and a reversible speed-reducing gearbox coupled to the motor to be driven in rotation thereby An outlet shaft is coupled to the speed-reducing gearbox to be driven in rotation thereby A first angular position sensor and a control circuit are connected to the motor. The circuit delivers a motor power supply signal that varies as a function of a position setpoint signal applied to the control circuit and as a function of signals delivered by the angular position sensor. The gearbox has a plurality of speed-reducing each having a pair of gears mounted to rotate about two parallel axes of rotation.
    Type: Grant
    Filed: September 8, 2008
    Date of Patent: June 28, 2011
    Assignee: Eurocopter
    Inventors: Philippe Vincent, S├ębastien Pellegrino, Bernard Gemmati
  • Patent number: 7498760
    Abstract: A drive control apparatus including a feed-forward operation amount generation device, a feed-back operation amount generation device, a feed-forward correction amount generation device and a feed-forward operation amount correction device is provided. The drive control apparatus is configured to input an input operation amount, which is obtained by adding a feed-back operation amount to a feed-forward operation amount corrected by the feed-forward operation amount correction device, into a control target thereby to drive the control target.
    Type: Grant
    Filed: September 27, 2006
    Date of Patent: March 3, 2009
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventor: Shigeki Akiyama
  • Patent number: 7224141
    Abstract: A position controller of a motor in which the position time can be shortened even if an external force is applied. A speed control unit (13) comprises a compensation low-pass filter (133) having a transfer function corresponding to a delay of a speed control system. The speed control unit (13) further comprises an integral control system including a speed integrator (132) for integrating the difference between a speed and a delay speed command to the low-pass filter (133) compensating the delay in the speed control unit. A proportional control system outputting a command proportional to the speed command, and a multiplying means (134) for multiplying the sum of outputs from the integral control system and the proportional control system by a speed proportional gain and outputting the result as a torque command.
    Type: Grant
    Filed: October 21, 2003
    Date of Patent: May 29, 2007
    Assignee: Sanyo Denki Co., Ltd.
    Inventor: Yuuji Ide
  • Patent number: 7138782
    Abstract: The present invention provides a motor control system and method thereof. The motor control system comprises a motor controller and a compensation device. The motor controller is used for generating a motor control output according to a reference signal and a first signal. The compensation device is used for generating a compensated motor control output according to the motor control output and a second signal. Moreover, the compensation device utilizes the compensated motor control output to reduce the steady-state phase error between the first signal and the reference signal.
    Type: Grant
    Filed: January 12, 2005
    Date of Patent: November 21, 2006
    Assignee: Mediatek, Incorporated
    Inventors: Chao-Lung Tsai, Chang-Long Wu
  • Patent number: 7129665
    Abstract: A control apparatus for a machine that can be operated at high precision in a stable control state is provided by driving a movable body with control parameters suited to the mechanical state. A control parameter calculation circuit is provided to obtain control parameters for a drive apparatus control circuit for driving actuators in accordance with the conditions of actuator rotational velocity, the orientation of the movable body, and the position of the movable body, and a control parameter K for the drive apparatus control circuit is varied.
    Type: Grant
    Filed: January 3, 2005
    Date of Patent: October 31, 2006
    Assignee: OKUMA Corporation
    Inventor: Tomoharu Ando
  • Publication number: 20030214264
    Abstract: An opening and closing control device of opening and closing member for a vehicle Includes a motor for actuating the opening and closing member, and a control unit for driving the motor so as to become a predetermined target speed and for driving the motor in reverse direction as a detection of entrapped obstacles when the actual speed of the motor reaches to an entrapment Judgment speed which is set lower than the target speed. The control unit sets a threshold speed which is higher than the target speed and outputs an output duty to the motor for achieving the target speed by feedback control. The control unit switches the output duty after the actual speed of the motor becomes higher than the threshold speed to an output by feedforward control based on the target speed.
    Type: Application
    Filed: April 8, 2003
    Publication date: November 20, 2003
    Inventors: Satoru Onozawa, Yasuaki Hiraki, Seika Matsui, Mizuho Morimitsu
  • Patent number: 4855744
    Abstract: A system for producing a digital representation of the value of an angle .theta., typically a phase angle, from two analog input quantities representative of A sin .theta. and A cos .theta., where A is an amplitude factor, comprises logarithmic amplifiers (IC1-IC4) which produce analog representations of a plurality of quantities (sin .theta., cos .theta., sin (.theta.+3.pi./4), cos (.theta.+3.pi./4)) derived from the two input quantities and which are arranged to add or subtract their outputs to produce quantities (V.sub.1 -V.sub.4) which are independent of A and the value of each of which lies within a predetermined range (-C to +C) in at least one respective portion (2.pi./n) of an angular range for .theta. of 2.pi. radians. The digital representation of .theta. is the concatenation of digital representations of the angular portion (2.pi./n) in which .theta. lies and of the value of .theta. within the portion that is derived from the selected appropriate one of the quantities V.sub.1 -V.sub.
    Type: Grant
    Filed: November 1, 1988
    Date of Patent: August 8, 1989
    Assignee: U.S. Philips Corporation
    Inventor: Anthony D. Sayers
  • Patent number: 4492901
    Abstract: A control system for synchronizing a combination press line comprised of a transfer press and a double-action press.The transfer press is set as a master press and the double-action press as a slave press following the transfer press in operation.The transfer and double-action press each has a synchro coupled to respective drive shafts for detecting an angular position of each press. A comparator is provided for comparing signals from both synchros and generating a signal corresponding to a difference between signals from both synchros. The output signal from the comparator is fed only to a motor for the double-action press for controlling the speed of the motor, thus enabling the double-action press to follow the transfer press in operation.
    Type: Grant
    Filed: May 27, 1982
    Date of Patent: January 8, 1985
    Assignee: Kabushiki Kaisha Komatsu Seisakusho
    Inventor: Yoshihiro Higashi
  • Patent number: 4354144
    Abstract: A continuously variable transmissionless drive system providing maximum torque at low speeds. The system is usable in a hybrid vehicle having a prime mover, such as an internal combustion engine, operated at its optimum rpm for efficiency. The prime mover drives a pair of amplidynes which in turn operate a pair of dc motors to produce rotation of the output shaft for driving the wheels of the vehicle via a novel differential drive system which drives the output shafts in which the effective gear ratio may be externally controlled to vary from a very high step down ratio producing very high torque to a one-to-one ratio for driving at a constant speed. Each drive motor is connected to a separate bevel gear in the differential and control of the output shaft speed and torque is obtained by controlling the speed and direction of rotating of the bevel drive gears.
    Type: Grant
    Filed: February 1, 1982
    Date of Patent: October 12, 1982
    Inventor: Milton E. H. McCarthy
  • Patent number: 4029949
    Abstract: A system for controlling the position of a movable element, such as a microscope slide in one embodiment thereof, which system includes a unique high resolution digital-to-analog converter which converts a digital command signal to an analog servo input command for moving the element along an arcuate path in two orthogonal directions and for moving the element in a third orthogonal direction along a linear path. The unique digital-to-analog converter which would be broadly useful in many different applications includes means responsive to selected combinations of the most significant bits of a digital input signal for supplying equally weighted selected combinations of a reference signal and responsive to selected combinations of the least significant bits thereof for supplying binary weight selected combinations of the reference signal, the equally weighted binary weighted combinations being combined to produce the analog output signal.
    Type: Grant
    Filed: July 8, 1975
    Date of Patent: June 14, 1977
    Assignee: The Charles Stark Draper Laboratory, Inc.
    Inventor: Brock S. Dew
  • Patent number: 4000449
    Abstract: Two movable members driven by individual motors are positioned accurately at any given time and are tracking each other for all displacements. Individual positioning is used with differential positioning to force a follow-up of one member relative to the other. One feedback position loop provides a master reference for a second position loop of the slave motor drive, and the differential position signal makes the second loop operate as a vernier of the master loop. A limiter prevents the master drive from running ahead of the slave drive.
    Type: Grant
    Filed: October 22, 1974
    Date of Patent: December 28, 1976
    Assignee: Westinghouse Electric Corporation
    Inventor: Leonard P. Gripp