Quotables
"The wireless music box has no imaginable commercial value. Who would pay for a message sent to nobody in particular?"
David Sarnoff, American radio pioneer ; 1921
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 7372224 | System and method for determining barrier motor parameters without using sensors A barrier operator comprises a first measuring apparatus for measuring a current used by a direct current (dc) motor to move a barrier and a second measuring apparatus for measuring a generated voltage of the dc motor. A controller is coupled to the first measuring ... | 05/13/2008 |
| 7230358 | Electrical resonance circuits for high efficiency direct current motors Practically ideal electrical resonance is employed to soley provide armature power, and stator power if desired, to run DC motors. A practically ideal parallel resonant tank circuit (PIPRC) is used wherein the quotient of the “tank current” divided by the “lin... | 06/12/2007 |
| 7103487 | Circuitry and methods for current measurements referred to a precision impedance Circuitry and methods for obtaining accurate measurements of current supplied by an integrated circuit are provided. Current calculations are performed using information from a precision termination resistor and from the ratio relationship of two on-chip resistors. ... | 09/05/2006 |
| 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 |
| 7027721 | Temperature-rated variable speed control circuit of an electric fan An electric fan temperature-rated variable speed control circuit, includes a D.C. current source and fan activation IC. There are, between the current source positive and negative poles serially connected transistor, regulation tube, with the regulation tube negativ... | 04/11/2006 |
| 6949899 | Brushless DC motor having an AC power control device A brushless dc motor includes a conversion circuit and a dc motor drive circuit. The conversion circuit includes a rectifier unit, a pulse-wave-absorbing unit, a filter unit, a voltage-stabilizing control unit and a voltage-stabilizing unit. The rectifier unit, the ... | 09/27/2005 |
| 6944556 | Circuits and methods for current measurements referred to a precision impedance Circuitry and methods for obtaining accurate measurements of current supplied by an integrated circuit are provided. Current calculations are performed using information from a precision termination resistor and from the ratio relationship of two on-chip resistors. ... | 09/13/2005 |
| 6717380 | Method for shifting the instant of commutation for a sensorless and brushless direct-current motor as well as a system for implementing the method The present invention provides a method for shifting the instant of commutation for a sensorless and brushless direct-current motor (1), whose stator windings are fed by a multi-phase converter connection. The converter connection includes an output stage con... | 04/06/2004 |
| 6703803 | Fan motor driving circuit A fan motor driving circuit of the present invention comprises a device for detecting a power source voltage and outputting a voltage in proportion to a difference between the power source voltage and a predetermined rated voltage when the power source vo... | 03/09/2004 |
| 6518719 | Power tools with operating speed control circuit A variable speed power tool may include a speed adjusting device and/or a maximum speed adjusting device for adjusting the operating speed, and a fixed operating speed switch. An operator adjustable speed adjusting device having a position maintaining mec... | 02/11/2003 |
| 6424107 | Apparatus and method for controlling an electric motor An apparatus (10) for controlling an electric motor (36) having a plurality of motor phases includes a motor controller (32) that controls energization of each phase of the plurality of motor phases. A compensation circuit (56, 84, 104) is associated with... | 07/23/2002 |
| 6411572 | Method and apparatus for efficient measurement of optical pickup sled mechanism parameters A motor constant Km of a sled mechanism of an optical disc drive is to be measured. To this end, a parameter measurement device 1 for the sled mechanism includes an oscilloscope 8 for detecting the back-electromotive force Eb of a sl... | 06/25/2002 |
| 6184645 | Voltage mode drive for control circuit for an actuator using sampled back EMF control An apparatus for controlling an actuator in response to a target speed voltage signal, the actuator having a moveable member and having a coil that influences movement of the member. A first summing node is provided having a control output voltage, for su... | 02/06/2001 |
| 5859511 | Motor with input-controlled high side driver A circuit for operating a polyphase DC motor, such as the type having a plurality of "Y" connected stator coils, has circuitry for charging the coils at a rate which will reduce EMI and other noise, while maintaining an acceptable charge rate. The gate of... | 01/12/1999 |
| 5682459 | Speed control for controlling the speed of a DC motor A speed control for controlling the speed of a DC motor provides improved speed regulation during transient loading conditions. The control includes a regulating circuit having an output for controlling the armature voltage to the motor, An input speed re... | 10/28/1997 |
| 5590236 | Speed controller or an instrument having a speed controller including detection means for linearly detecting the amount of rotation less than one full rotation of a rotating member A speed controller includes a drive source, an input device for inputting the driving speed information of the drive source, a driver for driving the drive source on the basis of the driving speed information input by the input device, a detector for line... | 12/31/1996 |
| 5457374 | Motor controller for operating an inverter in current-controlled and voltage-controlled modes A motor controller for brushless motors operates an inverter in a current-controlled mode for low motor speeds and in a voltage-controlled mode for high motor speeds. By switching from the current-controlled mode to the voltage-controlled mode at higher s... | 10/10/1995 |
| 5291107 | Circuit for driving reel motor of videotape recorder A load driving circuit causes a driving current to flow through a load, such as a reel motor, an audio load or the like through the collector and emitter of a drive transistor. A load voltage which changes according to changes in the driving current is ob... | 03/01/1994 |
| 4933614 | Motor drive control circuit A blower motor drive control circuit is configured to maintain a fixed value of motor driving current to maintain a constant amount of air supply from an air conditioner regardless of changes in the amount of intake air.... | 06/12/1990 |
| 4912386 | Balanced bridge feedback control system In a system having a driver, a motor, and a mechanical plant, a multiloop feedback control apparatus for controlling the movement and/or positioning of a mechanical plant, the control apparatus having a first local bridge feedback loop for feeding back a ... | 03/27/1990 |
| 4792735 | Apparatus for adjusting torque and speed of a dentist handpiece D.C. motor A D.C. motor control circuit for a dentist's hand drill including a feedback loop to vary the torque of the motor according to the load on the motor while keeping the motor speed constant. Power to the motor is provided through a three terminal regulating... | 12/20/1988 |
| 4736142 | Speed control system for electric motor A speed-control system for an electric motor comprises a circuit for setting a desired motor speed and providing a speed-control signal, a circuit for sensing motor voltage and providing a motor voltage-related signal, a circuit for sensing current flow i... | 04/05/1988 |
| 4684858 | Motor pulse extraction system An improved system is provided for accurately referencing the revolving motion of electric motors used as positioning devices, and is particularly applicable to the automatic positioning and repositioning of ground station antennas in the reception of sat... | 08/04/1987 |
| 4675584 | Control system A control system capable of improving a disturbance response characteristic, includes a control processing unit and a power converter. The control processing unit includes apparatus for (a) providing a signal A equal to a predetermined transfer function G... | 06/23/1987 |
| 4649327 | Electric motor control circuit The motor control circuit is constituted by a current controlling circuit having a first output terminal connected to a source terminal via a resistor, a second output terminal connected to the source terminal through a motor to be controlled, the current... | 03/10/1987 |
| 4641068 | DC motor driving device A driving circuit for a DC motor in which the accuracy of the voltage applied to the motor when it is driven with a fixed voltage is improved and the fixed voltage is continuously applied for fixed-speed rotation control. The emitter of a motor driving tr... | 02/03/1987 |
| 4605884 | Control unit A control unit for a movable member comprises a motor for driving the movable member, a speed detector for detecting a rotating speed of the motor, a reference signal generator, amplifiers of different gains for amplifying a signal representing a phase di... | 08/12/1986 |
| 4574226 | Method and apparatus for controlling an electric motor the rotational speed of which is automatically reduced in no-load idling operation A method and apparatus for controlling an electric motor, in particular a motor for driving hand tools, saws, and the like, the rotational speed of which is automatically reduced in no-load idling operation and increased when working under load to pre-det... | 03/04/1986 |
| 4567409 | Control circuit for motor The disclosed motor control circuit includes a speed loop controlling the rotational speed of the rotor of a motor. A phase control loop controls the rotational phase of the rotor, and a voltage control loop controls a voltage applied to a winding of the ... | 01/28/1986 |
| 4565952 | Speed controlling device for rolling mills A device for controlling a speed of rolls of a rolling mill is disclosed which includes means for reducing an amount of drop of the speed of the rolls and a speed restoration time when a work to be rolled is introduced between the rolls.... | 01/21/1986 |
| 4561677 | Passive seat belt device A passive seat belt device in which a runner member to which a part of webbing is connected is moved on a rail member by being driven by a driving motor and thereby can assume a seat occupant restraining position and a seat occupant liberating position ha... | 12/31/1985 |
| 4513231 | Control circuit of pulse width modulation inverter The invention relates to a control circuit of a pulse width modulation inverter, wherein a current control circuit to output a current control signal corresponding to a current command signal is provided, main transistors of a main circuit of the pulse wi... | 04/23/1985 |
| 4510423 | Motor apparatus A motor apparatus includes a motor, a first circuit for sensing a back electromotive force of the motor to provide a first signal, a second circuit for sensing a rotation speed of the motor to provide a second signal, a third circuit responsive to the fir... | 04/09/1985 |
| 4494057 | Speed control system for small medical motors A speed control system for small medical motors. The system comprises a drive voltage regulation circuit, a current detection circuit which generates a detection signal in accordance with motor current, a voltage detection circuit which generates a detect... | 01/15/1985 |
| 4476417 | Control arrangement for a static converter A control arrangement for a static converter of the type which supplies a DC machine. A pilot signal is produced, the pilot signal being responsive to the actual speed value and the desired current value of the DC machine. The pilot signal is then combine... | 10/09/1984 |
| 4450392 | Electronic speed regulator for a d.c. motor An integrated circuit regulator in which current regulation is effected by means of a current mirror utilizing motor current as an input. The base currents of the transistors of this current mirror are supplied by a second current mirror whose operation d... | 05/22/1984 |
| 4384825 | Personal sampling pump A portable battery powered pump providing constant mass flow of air sample through a particular filter or vapor trap in which the pump drive motor speed is controlled by an amplifier having a reference voltage input and an inverse feedback signal related ... | 05/24/1983 |
| 4362976 | Driving circuit for DC motor Disclosed is a DC motor drive circuit adapted to prevent thyristor commutation failure when a thyristor-controlled three-phase full-wave reversible bridge undergoes a transition in operating mode from a power inversion mode to a power rectification mode. ... | 12/07/1982 |
| 4355268 | Motor control apparatus Disclosed is a motor control apparatus which includes a pulse generator for producing a first signal as a pulse signal having a period corresponding to the rotational speed of a motor, a timer for producing a second signal inverted to a first level in res... | 10/19/1982 |
| 4345189 | Motor rotation speed control circuit A rotation speed control circuit is designed to control the rotational speed of a motor at a constant speed, despite variations in both the load and the power supply. A motor (100') and a resistor (R) are connected to a power supply terminal, respectively... | 08/17/1982 |
