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| Number | Title | Issue Date |
| 7444070 | Fan motor with digital controller for applying substantially constant driving current An improved fan arrangement features a radial or diagonal fan (370) with which a direct current motor (32) is associated as its drive motor, further comprising a digital control element (23, 24) which executes a program, for controlling the curr... | 10/28/2008 |
| 7394975 | Drive circuit for a sensored brushless DC motor A drive circuit for a sensored brushless DC motor, which has a rotably mounted rotor hub, comprises four legs. Each leg has a MOSFET and a diode configured to form four individual nodes. A first primary stator winding is coupled between the first and second nodes, w... | 07/01/2008 |
| 7372228 | Electric power tool with memory capability The invention relates to an electric power tool having a control and/or regulating device for an electric motor. It is provided that the control and/or regulating device (4) is assigned an electronic memory element (5) for at least one operating state ... | 05/13/2008 |
| 7318485 | Method of Controlling the direction of rotation of a power tool The invention discloses a power tool for screwing or drilling having a motor for driving a drive shaft, a controller for controlling the power tool, a motor switch for switching the motor on and off, switch for reversing the power tool between clockwise and counter-... | 01/15/2008 |
| 7313480 | Integrated drilling dynamics system A method and apparatus for controlling a drilling operation involving the rotation of a bottom-hole assembly carried by a drillstring. In one embodiment, an integrated, closed-loop rigsite analysis system is provided for acquiring and analyzing real-time mud logging... | 12/25/2007 |
| 7274866 | Power tool and method for controlling a power tool A power tool is disclosed comprising a controller for controlling at least one operating parameter, a motor for driving a tool, at least three switching elements which are coupled to the controller, and a speed sensor for monitoring the speed of the motor to generat... | 09/25/2007 |
| 7273159 | Cordless power tool system with improved power output An ergonomically efficient cordless power tool system having desired power-to-weight ratios may be configured by reducing weight in one or more constituent weight groups of a given cordless power tool system, while maintaining or improving the total power output of ... | 09/25/2007 |
| 7274865 | General purpose 100% solid state drive for direct current rotary machines General purpose 100% solid state Direct Current drive for rotary DC machines with four quadrants operation. It is to say that allows the rotary DC machine to act like motor or generator in the two direction of possible rotation. In the first and third quadrant as mo... | 09/25/2007 |
| 7245100 | Multi-axis AC servo control system and method A multiple axis servo control implements a multi-tasking PWM control unit to provide PWM signals for multiple axes in a single unit. A time slice mechanism provides axis selection signals based on a system clock signal to permit control parameters of the selected ax... | 07/17/2007 |
| 7245099 | Electronic apparatus that allows cooling fan to be driven with certainty even at the time of software malfunction/lock-up or at the time of controller failure A voltage for driving a cooling fan is usually output from a fan voltage control circuit. Whether to cause the fan voltage control circuit to output the drive voltage or not is controlled by a system management utility (software) and a bridge controller (hardware) o... | 07/17/2007 |
| 7242857 | Motor control circuit A motor control circuit includes a pulse width modulation (PWM) signal generating circuit, a driving circuit and a waveform-shaping circuit connected between the PWM signal generating circuit and the driving circuit. The PWM signal generating circuit generates a squ... | 07/10/2007 |
| 7205733 | Self-startup circuit for DC fan A self-startup circuit for a DC fan includes a voltage sampling device receiving a first control signal, a comparator, and a self-startup device. The comparator includes two input terminals and an output terminal. One input terminal is connected to an output termina... | 04/17/2007 |
| 7190142 | Apparatus and method for controlling fan drive in computer system Embodiments of an apparatus and method can control a fan drive in a computer system. Such embodiments of apparatus and methods can alternately output a plurality of pulse width modulation (PWM) control signals at a predetermined time ratio and variably control a rot... | 03/13/2007 |
| 7185528 | Speed and fluid flow controller A system and method for measuring fluid flow rate in a system where fluid is pumped, such as a gas monitoring instrument where gas is pumped from a space such as a room or enclosure through a conduit to a sensor. The flow of gas through a pump is determined by measu... | 03/06/2007 |
| 7184654 | Semiconductor device control apparatus and method In a control apparatus for a motor, which rotates a fan, a semiconductor device is connected to the motor in series to drive the motor. An analog driver circuit drives the semiconductor device with an analog voltage. A PWM control circuit drives the semiconductor de... | 02/27/2007 |
| 7174973 | Power tool interface This interface is an apparatus for controlling a power supply delivering power to a DC powered tool. The interface is connected between the DC power supply and the DC tool wherein the interface is configured to read signals from the tool and control the power suppli... | 02/13/2007 |
| 7174093 | Wheel chair drive apparatus and method A control system for a powered wheel chair drive modulates a pulse power delivery signal such that power is delivered gradually at throttle positions corresponding to a low speed, and power is delivered more rapidly at throttle positions corresponding to a higher sp... | 02/06/2007 |
| 7164244 | Apparatus for controlling electric motors and related control method An electric motor controller controls the currents flowing through the phase windings of an electric motor. The electric motor controller includes driving stages for driving respective phase windings of the motor and a memory for storing samples of reference signals... | 01/16/2007 |
| 7145311 | Vector control device of winding field type synchronous machine A vector control device of a winding field type synchronous machine with which even when voltage changes caused by resistance voltage falls and inductance fluctuations due to armature current occur the armature voltage is controlled exactly to a desired command valu... | 12/05/2006 |
| 7112900 | Method and system for sensing switch position to prevent inadvertent startup of a motor A method for preventing sudden inadvertent operation of a motor of a tool or appliance when the motor is initially electrically connected to a power source while an On/Off switch for controlling the motor is in a closed (i.e. ‘On’) position. The method includes ... | 09/26/2006 |
| 7102303 | Generic motor control system and method A method for controlling the operation of a motor utilizing a universal motor control module. The method includes sampling at least one motor operating criterion during operation of the motor and executing a universal control algorithm at a predetermined periodic in... | 09/05/2006 |
| 7095952 | Method for optimizing the efficiency of a motor operated under a load The invention relates to a method to optimize the efficiency of a motor operated under a load having an essentially quadratic characteristic curve, the motor being connected to a motor control with whose aid at least one free motor parameter w can be changed to infl... | 08/22/2006 |
| 7081772 | Optimizing logic in non-reprogrammable logic devices A method for reducing the amount of logic needed to perform logic operations in non-reprogrammable logic devices based on preexisting circuit designs is provided. The logic optimization method reduces die size and power consumption while increasing the performance o... | 07/25/2006 |
| 7079964 | Method for determining the frequency of the current ripple in the armature current of a commutated DC motor A method for determining the frequency of current ripples contained in the armature current signal of a commutated direct current (DC) motor includes determining frequency spectral results of the current signal and of a motor electric operating parameter. The freque... | 07/18/2006 |
| 7075261 | Method and apparatus for controlling a fan A method and apparatus for controlling a fan is disclosed. In one embodiment, a method for controlling a fan includes applying power to the fan at startup. The fan may be supplied a predetermined amount of current, which may break the inertia of the fan propeller an... | 07/11/2006 |
| 7062159 | Device for correcting a digital estimate of an electric signal A device for correcting a digital estimate of an electric signal is described. The device includes a comparator that generates a current proportional to the difference between an analog estimate signal, which derives from the digital estimate, and the electric signa... | 06/13/2006 |
| 7046917 | Speed controlling device of a motorized cart for a person to ride on A device of a cart includes a control, a speed regulating potentiometer, a microprocessor, a digital-to-analogue converter, a motor controlling unit, and a switch; the control is angularly displaceable and near to handlebars of the cart; the potentiometer is connect... | 05/16/2006 |
| 7036703 | Hand-held working tool The present invention relates to a hand-held working tool, such as a setting device used for driving fastening elements such as nails, bolts, pins and the like into a surface, or an at least partially percussive hand-held tool having a housing part (11) and a... | 05/02/2006 |
| 6971454 | Pulsed rotation screw removal and insertion device A drill/driver (e.g. an electric drill) with a screwdriver bit attachment, and a method of controlling the drill/driver, are described. This method of control will greatly reduce the occurrence of stripped screw heads on most types of screws. By periodically stoppin... | 12/06/2005 |
| 6941785 | Electric fuel pump condition monitor system using electrical signature analysis A pump diagnostic system and method comprising current sensing probes clamped on electrical motor leads of a pump for sensing only current signals on incoming motor power, a signal processor having a means for buffering and anti-aliasing current signals into a pump ... | 09/13/2005 |
| 6927549 | Electric motor control unit An electric motor control unit mounted in an automotive vehicle having a motor that is variable in its rotational speed. A temperature sensing element is arranged to contact a busbar so that relays permit switching operation in response to detection of abnormal heat... | 08/09/2005 |
| 6902318 | Thermometer for engine of vehicle Provided is a thermometer that is mounted on an engine incorporated in a vehicle and that measures the temperature of the engine during running of the vehicle. A temperature/resistance element included in the thermometer senses the temperature of the engine all the ... | 06/07/2005 |
| 6891346 | Commutation and velocity control system for a brushless DC motor A commutation and velocity control system of a brushless DC motor receives a velocity command signal and provides command signals to drive the brushless DC motor. The system includes a summer that receives the velocity command signal and a velocity feedback signal a... | 05/10/2005 |
| 6888331 | Commutation of sensorless direct-current motors The invention relates to a sensorless commutation of a direct-current motor. To allow an exact, easy to design, flexible, and highly integratable circuit arrangement for commuting motor devices, analogue phase detectors are replaced by digital devices, in particular... | 05/03/2005 |
| 6839653 | Method for correcting the determination of the rotational position of a commutated DC motor drive shaft A method for determining the position of an element driven by the drive shaft of a commutated direct current (DC) motor includes counting current ripples detected in an armature current signal as the motor rotatably drives the shaft. A frequency spectral analysis of... | 01/04/2005 |
| 6810202 | Apparatus for controlling rotational speed of motor An apparatus for controlling a rotational speed of a motor, coupled to a sensing unit capable of outputting a sensing signal. The apparatus includes a controlling unit, coupled to the sensing unit, for outputting a controlling signal according to the sensing signal ... | 10/26/2004 |
| 6771894 | Motor control resolution enhancement A motor speed resolution enhancement method and system. A display system controller (202) measures the frame rate of an incoming signal to determine the desired color wheel speed. A digital speed control word (212) representing the desired color wheel ... | 08/03/2004 |
| 6750622 | Motor controller system for battery-powered motors A motor controller system (15a) for dc power source motors (10) which includes a sensor device (16) that operates to measure and generate a voltage signal from the motor current and the rate of change of said current, and a programmable i... | 06/15/2004 |
| 6633149 | Method for digital control of a universal motor, in particular for electrical household appliances The invention concerns a method for digital control of a universal motor, in particular for electrical household appliance, comprising steps which consist on: measuring said engine (21) rotation speed; determining the difference between the measured speed... | 10/14/2003 |
| 6433507 | Spread spectrum motor control circuit A motor control circuit for use in a motor circuit includes a varying duty cycle pulse width modulation circuit and a switch. The varying duty cycle pulse width modulation circuit is operable to generate a PWM signal having a varying duty cycle, wherein a... | 08/13/2002 |
