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| Number | Title | Issue Date |
| 7336060 | Circuit and method for controlling a DC-DC converter by enabling the synchronous rectifier during undervoltage lockout A control circuit for a DC-DC converter that prevents a deficiency from occurring due to sudden interruption in power supply. The control circuit activates and inactivates a main switching output transistor and a synchronous rectification output transistor to conver... | 02/26/2008 |
| 7333504 | Simultaneous serial transmission of messages with data field arbitration A communication system has a number of nodes connected to a serial data bus. Nodes communicate with each other by transmitting dominant and recessive bits during bit intervals as taught by the CAN (controller area network) arbitration protocol. According to the CAN ... | 02/19/2008 |
| 7330009 | Method, apparatus, and program for driving a motor in a feedback control system, capable of suppressing motor oscillation A method, apparatus, and program for driving a motor in a feedback control system, capable of suppressing oscillation of the motor rotational speed are disclosed. A motor drive controller includes a drive motor, a detector, and a motor drive controller. The drive mo... | 02/12/2008 |
| 7321994 | Electronic control unit An electronic control unit includes a microcomputer and an input interface circuit. The microcomputer has square wave input ports, a reference square wave input port, a serial communication port, and an output port. Square wave signals are inputted from sensors to f... | 01/22/2008 |
| 7317294 | Pulse generator and method thereof A pulse generator and method thereof. The pulse generator may include a first switching unit receiving a plurality of receiving a plurality of time interval indicators and a first selection signal. The first switching unit may select one of the plurality of time int... | 01/08/2008 |
| 7305208 | Image heating apparatus with discharge occurring between a charge eliminating member and a pressure roller The image heating apparatus for heating a toner image formed on a recording material, includes a rotatable member, a pressure roller which contacts with the rotatable member, wherein the recording material is heated while being conveyed by a nip portion between the ... | 12/04/2007 |
| 7243894 | Mount for vibratory elements The invention is a mounting system for a vibrational element. The vibrational element has a longitudinal axis, an outer surface and an axial displacement node. The mounting system includes an isolation member which has an isolation surface, an isolating body, and an... | 07/17/2007 |
| 7230400 | Electronically commutated motor In an electronically commutated motor (M), rotor position signals are generated by means of a galvanomagnetic rotor position sensor (40). A timer (CNT_HL) brings about an advanced commutation which occurs only once the motor has reached a specific rotation sp... | 06/12/2007 |
| 7195238 | Sheet conveying apparatus and image forming apparatus A sheet conveying apparatus for conveying a sheet using a sheet conveying unit arranged along a sheet conveying path has a skew detecting unit for detecting skew of the sheet conveyed along the sheet conveying path with respect to a sheet conveying direction, a skew... | 03/27/2007 |
| 7190130 | Electric motor pole position sensing method, pole position sensing apparatus, and electric motor control apparatus using the same It is an object of the invention to provide a method which can detect a magnetic pole position easily and surely by using high-frequency currents such as harmonics of an inverter output and carrier frequency components. The invention provides a method of detecting a... | 03/13/2007 |
| 7162510 | Communication system for a control system over Ethernet and IP networks A communication system is provided for communication within a control system. The communication system has a plurality of simple devices connected to an intra-level communications network, each simple device being adapted to directly exchange data with the other sim... | 01/09/2007 |
| 7159479 | Active damper for stabilized mirrors An active damping method for a stabilized mirror, and a corresponding active damper apparatus, comprising providing a tachometer measuring speed of a motor driving the mirror, employing compensation electronics receiving input from said tachometer and the motor, and... | 01/09/2007 |
| 7158328 | Multi-phase acceleration of a data storage disc A disc drive having a multi-phase acceleration procedure is disclosed. The multi-phase acceleration procedure accelerates a data storage disc in the disc drive from an initial rotational velocity to a final rotational velocity. As the disc reaches the final rotation... | 01/02/2007 |
| 7141943 | Brushless DC motor system and method of controlling the same A brushless DC (BLDC) motor system and a method of controlling the same are provided. The BLDC motor system comprises a BLDC motor including a rotator and a stator, a plurality of switches, a DC current sensor, a position detector and a controller. The stator has a ... | 11/28/2006 |
| 7119514 | Inverter An inverter has a measuring part that measures an operating time such as the time interval from when a command to start a specified operation by an associated system until a signal indicating the completion of the operation is received. A comparing part compares thi... | 10/10/2006 |
| 7106020 | Method of operating a brushless DC motor Methods and devices for brushless DC motor operation. An example method may include using previously sensed Hall effect sensor transitions to predict a future Hall effect transition, and dividing a time between a most recent Hall effect sensor transition and the pre... | 09/12/2006 |
| 7099720 | Method for identifying a control path of a controlled system A method for identifying a control path of a controlled system, and more particularly to a method for identifying a control path in the presence of deterministic perturbations is described. At least one deterministic perturbation correcting signal is determined in a... | 08/29/2006 |
| 7091796 | Method and system for calibration of a voltage controlled oscillator (VCO) A method for calibrating a voltage controlled oscillator (VCO) comprising applying a plurality of known voltages to the input of a VCO, monitoring, for each of the voltages, an output count from the VCO over a set interval, and storing the output counts for each vol... | 08/15/2006 |
| 7060969 | Rotating machine having rotation sensors Three rotation sensors circumferentially arranged at 90 degree intervals in a disk code wheel attached to a motor's output shaft respectively output a signal corresponding the rotational speed of the wheel. An error component of one period (one-periodic component) o... | 06/13/2006 |
| 7061587 | Control system, lithographic apparatus, device manufacturing method, and device manufactured thereby A control system for a positioning device includes a controller connected in a feedback loop. The controller calculates a current for supply to the positioning device according to the error between a desired current value and a measured current value. This current i... | 06/13/2006 |
| 7049771 | Multi-phase carrier signal generator and multi-phase carrier signal generation method A carrier signal generation section is provided for each of U, V, and W phases, and each of the carrier signal generation sections has an up-down counter for counting clock signals output from a clock generator. An initial value is set for each of the up-down counte... | 05/23/2006 |
| 7049778 | Inverter control apparatus and inverter control method An interrupt signal is generated at each of rising timings of PWM signals which are produced on the basis of phase-shifted triangular wave carrier signals for phases, and voltage command values for the phases. At timings of the interrupt signals, A/D conversion of m... | 05/23/2006 |
| 7019481 | Carriage driving apparatus and motor control method 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 de... | 03/28/2006 |
| 6997684 | Fan motor with digital controller for applying substantially constant driving current The invention relates to a fan arrangement comprising a radial or diagonal fan (370) with which a direct current motor (32) is associated as drive motor, further comprising a digital control element (23, 24) such as a microcontroller or micropro... | 02/14/2006 |
| 6967459 | Method for controlling or regulating the current in a direct current machine for a fan The invention concerns a method of regulating the current in a direct current machine with which are associated an arrangement for generating a current target value signal, as well as a PWM generator (FIG. 11: 182) whose output signal (PWM2) is control... | 11/22/2005 |
| 6954414 | Controlling optical pickup of optical disk drive by detecting change of sampling signals taken from a motor drive signal A drive current or a drive voltage is controlled corresponding to change of load by sampling the drive current or drive voltage of a motor to move an optical pickup and then detecting change of the sampling signal as change of the optical pickup when it is moved. Mo... | 10/11/2005 |
| 6950726 | Method and device for numerical control return to origin of a master and slave shaft A numerical control apparatus for controlling a machine having two moving shafts placed in parallel and separate servomotors 6 and 10 for driving one of the shafts as a master shaft and the other as a slave shaft in the same direction and performing re... | 09/27/2005 |
| 6927550 | Device and method used to automatically compensate for synchronous disturbance To eliminate unwanted vibrations caused by synchronous disturbances, such as synchronous disturbances caused by an imbalance, for example, the invention proposes a compensation device for closed loop compensation of a synchronous disturbance in a rotating machine co... | 08/09/2005 |
| 6912476 | Position measuring device and method for determining a position A method for position determination in a position measuring device that includes digitizing analog position data from a detector unit within time intervals of an internal clock rate and calculating position data from the digitized data. Determining a period of time ... | 06/28/2005 |
| 6900609 | Method and control structure for damping low-frequency load oscillations in drives with a motor and load According to the invention, the controller cascades are suitably divided up and the oscillation damped only in the load rotational-speed controller. Here, a motor rotational-speed setpoint value (z) of a quickly regulated motor rotational-speed controller (9)... | 05/31/2005 |
| 6873129 | Method of controlling rotational velocity of a rotatable member during encoder initialization for an imaging apparatus A method of controlling a rotational velocity of a rotatable member during initialization of an analog encoder unit that generates a channel A signal and a channel B signal, includes the steps of processing the channel A signal and the channel B signal to generate a... | 03/29/2005 |
| 6831438 | Method and apparatus for controlling DC motor Controlling a direct current motor driving an object by determining, if the object does not reach a target position, a reference velocity corresponding to a point of time from a predetermined velocity trajectory, obtaining a position of the object, calculating a cur... | 12/14/2004 |
| 6765360 | Dynamic optimizing method for speed data and positioning device using this method A dynamic optimization method for speed data, for compensating for a speed data maximum value and a minimum resolution that can be specified by users without depending on a speed pattern preparation cycle. A dynamic optimizing method for speed data used for preparin... | 07/20/2004 |
| 6741055 | Positioning-controlling apparatus and positioning-controlling method, and part-mounting equipment and part-mounting method There are provided a positioning-controlling apparatus and a positioning-controlling method in which a rotary encoder (2) detects the Z phase before the subject (4) is return to the origin which is the position of the Z phase detected by the linear enc... | 05/25/2004 |
| 6670784 | Motor Apparatus and control method therefor A speed control unit computes a instructed current based on an error between a instructed speed and an estimated speed. A current control unit outputs a reference voltage corresponding to an error between the instructed current and a detected motor curren... | 12/30/2003 |
| 6515442 | Position controller To overcome the problem of a low frequency disturbance causing minute vibrations affecting response attributable to the difficulty of adaption to the phase of the vibrations, the present invention provides a position controller, which includes a subtracte... | 02/04/2003 |
| 6459228 | Dual input servo coupled control sticks The present invention provides an active control system for coupling the movements of a pair of independently operated manual input devices such as dual flight control sticks operated by a pilot and co-pilot flying an aircraft. Each input device is config... | 10/01/2002 |
| 6401016 | Vehicle control device A target output torque and target power generation output of a motor are computed based on a vehicle running state, and a target input rotation speed of a generator is computed based on the target power generation output. The final target output torque of... | 06/04/2002 |
| 6323614 | System and method for controlling suspension using a magnetic field A system for controlling the position of a rotating member suspended using a magnetic field includes at least one sensor that is operable to detect the position of the rotating member, the sensor further being operable to generate a position reference sig... | 11/27/2001 |
| 6204622 | Position controller A position controller has a command generator for generating position instructions, a position control unit for controlling a position by inputting a position instruction and the position of a motor being an object to be controlled, and outputting a speed... | 03/20/2001 |
