Quotables
"It is my heart-warmed and world-embracing Christmas hope and aspiration that all of us, the high, the low, the rich, the poor, the admired, the despised, the loved, the hated, the civilized, the savage (every man and brother of us all throughout the whole earth), may eventually be gathered together in a heaven of everlasting rest and peace and bliss, except the inventor of the telephone. "
Mark Twain ; Christmas greetings, 1890
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| Number | Title | Issue Date |
| 8115432 | Triphase rotating electrical machine A triphase rotating electric machine includes three coils evenly distributed around a rotational axes of the machine, and at least one first sensor, capable of generating a periodic signal to represent the position of the machine around the axle and a control circui... | 02/14/2012 |
| 8080963 | Motor driving circuit and motor driving method A motor driving circuit includes a detecting unit, a signal control unit, a comparing unit and a driving unit. The detecting unit detects a rotation speed of a motor and thus outputs a detecting signal. The signal control unit generates a reference signal. The compa... | 12/20/2011 |
| 8072171 | Motor control A method of controlling a current of a three-phase electric motor with a three-phase controller. The firing angles are adjusted so as to leave a range of firing angles in which DC components appear. ... | 12/06/2011 |
| 8072170 | Motor controller of air conditioner The present invention relates to a motor controller for air conditioner including a converter having at least one switching element for converter, the converter converting AC utility power into DC power by a switching operation of the switching element; an inverter ... | 12/06/2011 |
| 8063601 | Motor driving circuit for adjusting speed of a motor by changing an output voltage A motor driving circuit for adjusting speed of the motor by changing output voltage is disclosed. One end of the motor is coupled to a variable voltage source. The motor driving circuit includes a motor-driving unit, a control unit and a determining unit. The motor-... | 11/22/2011 |
| 8004227 | Method for operating a rotating electrical machine A method is specified for operating a rotating electrical machine, in which the rotating electrical machine is connected in terms of phase to a converter circuit, having a DC voltage circuit, for connecting at least two voltage levels, and the phases of the converte... | 08/23/2011 |
| 7880419 | MVDC power transmission system for sub-sea loads A system for the transmission of a direct current (DC) at a medium voltage level includes a system DC link configured to carry power from a source to a load module. The load module includes a DC-to-DC voltage step-down converter, a DC-to-AC inverter coupled downstre... | 02/01/2011 |
| 7843157 | Methods and apparatus for providing motor control signals A method for providing a compatible interface between a motor control circuit and a system controller is described. The method includes determining which signals in the interface have incompatible voltage requirements, and inserting a series resistance in an interfa... | 11/30/2010 |
| 7629762 | Motor driving circuits A motor driving circuit comprising first and second input voltage source sets, a reference voltage source, first and second voltage level shift units, a logic unit, and an output voltage terminal. The first input voltage source set provides a first input voltage set... | 12/08/2009 |
| 7446495 | Drive circuit for a hair clipper A drive circuit for a hair clipper comprises an electric motor and a control circuit for operating the motor at a constant speed regardless of load conditions. The control circuit has detector means for sensing the supply voltage to the clipper and the clipper curre... | 11/04/2008 |
| 7417400 | Motor controller The present invention is a motor control device comprising a control system, the control system being capable of controlling the motor by PWM and having integration means being capable of outputting an integrated value obtained by integrating a deviation between a r... | 08/26/2008 |
| 7279864 | Control unit for driving a regulating transistor of a fan arrangement A control unit for driving a regulating transistor (2) of a fan arrangement, in which the regulating transistor (2) is connected in series with an electronically commutated fan (1), having control means (5, 6, R1, R2) for th... | 10/09/2007 |
| 7262568 | Brushless DC motor coupled directly to AC source and electric apparatus using the same motor A brushless DC motor is disclosed, in which a commercial AC source is full-wave rectified by a rectifier and then converted into a generally flat and low DC voltage not more than 45V by a DC voltage converter. The low DC voltage is applied in a full-wave driving met... | 08/28/2007 |
| 7235937 | Traction motor control system For controlling a traction motor of a vehicle, a current command value is determined based on a torque command and a load value representative of running load of the vehicle. A voltage command value is calculated in such a manner that a difference between the curren... | 06/26/2007 |
| 7233120 | Optimal fan presence detection Detecting the presence of an electric fan is described. A current sink circuit is coupled to a pulse width drive output of a fan control circuit. A logic state in a logic input buffer is defined based on current flow through the current sink. The logic state indicat... | 06/19/2007 |
| 7221117 | Method and system for controlling an electric motor in the event of flux reduction The present invention relates to a method and a system for correcting references (xref), in the case of flux reduction, used in a speed variator for controlling an electric motor M having a three-phase supply, for example of the synchronous or asynchronou... | 05/22/2007 |
| 7166976 | Method and control circuit for reducing line-bound disturbances in a pulse-width modulated control of an electric motor A method for reducing line-conducted interference in a pulse width modulated triggering system of an electric motor, a triggering pulse width modulation signal having, in one clock cycle, one or more signal edges between a first signal level and a second signal leve... | 01/23/2007 |
| 7145301 | Battery operated industrial truck A battery operated industrial truck with at least one first motor and at least one second motor, which are operated by one electric control or regulation device for each motor, which are realised such that the motors can be operated as generators in order to feed ba... | 12/05/2006 |
| 7129663 | Electric power steering apparatus and booster An electric power steering apparatus includes a booster circuit and a microcomputer. The booster circuit includes a booster coil, a first FET, and a second FET. The booster coil is connected to the first FET, which is grounded. A node a between the booster coil and ... | 10/31/2006 |
| 7122989 | Multiple speed mover assembly A mover assembly (16) that moves or positions an object (12) includes a mover output (226), an actuator (230), and a control system (18). The mover output (226) is connected to the object (12), and the actuator (23... | 10/17/2006 |
| 7112937 | Device and method for driving a motor A motor control device having memory for storing data indicative of a control mode and a pulse width modulation (PWM) value and logic that applies the pulse width modulation value to a voltage provided to a motor if the data indicative of the control mode indicates ... | 09/26/2006 |
| 7042181 | Method and system for controlling motor torque A method and system for controlling motor torque provides improved responsiveness and reliability in motor control applications. The motor control system includes a power converter, a voltage detector for detecting the converter input voltage and a control circuit f... | 05/09/2006 |
| 6972536 | Closure member control device and method for limiting positional deviation of closure member A control unit stores a count value, which is used to detect an operational position of a roof glass, in a RAM. The control unit determines whether the count value is properly stored in the RAM when a voltage of a power supply falls below a predetermined voltage and... | 12/06/2005 |
| 6944896 | Line voltage compensation system for power chair An apparatus, method and program product position a powered examination chair at a constant, desired speed despite fluctuations line voltage. A power signal supplied to an actuating motor of the chair is apportioned according to the line voltage supplied to the chai... | 09/20/2005 |
| 6933692 | Diagnostic method for an electric drive assembly A method and an electrical drive assembly 10 which operates in accordance with the method. Particularly, the drive assembly 10 includes a diagnostic portion 18 which compares a voltage signal which is communicated to an electrical machine 28 ... | 08/23/2005 |
| 6900605 | Motor control circuit for mirror device The present invention provides a mirror device motor control circuit that can reliably stop a mirror at predetermined positions with a simple configuration. In the control circuit of the invention, part of a lock current flowing to the motor flows to a base terminal... | 05/31/2005 |
| 6864653 | Equipment fan An improved fan useful for ventilating applications in motor vehicles features a modular structure, which facilitates quick replacement of any components likely to fail. A first module (110) is intended for permanent installation on the part that is to be coo... | 03/08/2005 |
| 6856110 | Low pin counted D-C motor integrated drive circuit A DC motor drive circuit includes a switching circuit that drives the coils of a small permanent magnetic DC motor. The drive circuit is preferably implemented in an integrated circuit device, such as a silicon CMOS device. Integrated into the same integrated circui... | 02/15/2005 |
| 6741059 | Controller for a wound rotor slip ring induction machine The direct torque control (DTC) principle is used to control the torque of a wound ring rotor slip induction machine, also known as a doubly fed or cascade machine, by utilizing a solid state inverter on the rotor side. In addition, the DTC principle is used to cont... | 05/25/2004 |
| 6724163 | Low pin count DC-motor integrated drive circuit A DC motor drive circuit, includes a switching circuit that drives the coils of a small permanent magnetic DC motor. The drive circuit is preferably implemented in an integrated circuit device, such as a silicon CMOS device. Integrated into the same integrated circu... | 04/20/2004 |
| 6448735 | Controller for a wound rotor slip ring induction machine The direct torque control (DTC) principle is used to control the torque of a wound ring rotor slip induction machine, also known as a doubly fed or cascade machine, by utilizing a solid state inverter on the rotor side. In addition, the DTC principle is u... | 09/10/2002 |
| 6392378 | Method for operating and controlling hysteresis motors In a method of operating and controlling hysteresis motors energized by a three-phase power supply and individually monitored by an operating monitoring system, whereby the effective power output of the individual motors is determined and the three-phase ... | 05/21/2002 |
| 6081080 | Method and apparatus for reducing voltage stresses in electric machines A method and apparatus for reducing winding failures in electric machines resulting from the application of high frequency or high dV/dt voltage pulses or voltage signals to the phase windings of the machine in which an inductive element is provided betwe... | 06/27/2000 |
| 5811953 | Motor driving circuit and method A motor driving circuit coupled to a motor having a plurality of phases of coils includes a standard power source generating a first power supply voltage, and a step-up power source for generating a second power supply voltage greater than the first power... | 09/22/1998 |
| 5724477 | Compensation for input voltage variation in an electric motor drive The present invention employs digital circuitry to compensate for variations in DC link voltage transmitted to a switched reluctance machine. The digital voltage compensation system of the present invention periodically samples the DC link voltage and act... | 03/03/1998 |
| 5457365 | Disk drive power management system A computer having a hard disk drive includes a battery voltage monitor which establishes a shut down condition of the computer if the supply voltage falls below a chosen level VL. Upon start up of the hard disk drive motor, current through the ... | 10/10/1995 |
| 5262705 | IC device for drive control of small hard disk drive unit Here is disclosed an IC for controlling the spindle motor of a small hard disk drive unit, characteristic in being provided with a voltage detection circuit for a control circuit driving power source, responsive to the voltage at the connecting terminal o... | 11/16/1993 |
| 5235261 | DC powered surgical handpiece having a motor control circuit A compact surgical handpiece comprises a motor energizable for moving a tool member, electric energy supply actuable for energizing the motor and a manually actuable trigger actuable to control motor operation. A motor control circuit interconnects the mo... | 08/10/1993 |
| 5137119 | Adaptive digital armature current control method for ward-leonard elevator drives using an SCR generator field converter A current regulator phase controls a power signal to control silicon controlled rectifiers arranged in a bridge. The silicon controlled rectifiers excite a generator field of an elevator drive. Discontinuity in the generator field current, caused by the i... | 08/11/1992 |
| 5020126 | Method and circuit for the automatic control of the speed of a DC motor by the control voltage of the motor The method consists in mounting the armature of an motor in a bridge circuit and in injecting, at the input of a circuit for amplifying the supply of the bridge receiving the control voltage, an automatic control signal corresponding to the difference bet... | 05/28/1991 |
