Quotables
"Transmission of documents via telephone wires is possible in principle, but the apparatus required is so expensive that it will never become a practical proposition."
Dennis Gabor, British physicist
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 |
| 7193377 | System and method for controlling motor speed using a biased pulse width modulated drive signal A motor drive circuit includes a switching circuit having an input node that receives a drive signal and a control node that receives a control signal. The switching circuit couples the input node to an output node responsive to the control signal. A bias element re... | 03/20/2007 |
| 7157871 | Intermittent drive control apparatus of motor Rotation of a capstan motor is detected by a frequency detector, and supplied to a CPU as a rotation detection signal CFG. The CPU derives a period of the rotation detection signal CFG, calculates an average rotational speed of the capstan motor on the basis of the ... | 01/02/2007 |
| 7145299 | Power window control system A master controller installed in a master controller box and slave controllers installed in car doors to open and close window glasses of a car are connected by a single wire to each of slave controllers for enabling to send control signals through such a single wir... | 12/05/2006 |
| 7122982 | DC motor rotation information detecting device A rotation information detection device detects rotation information of a DC motor based on a surge component waveform superimposed on a voltage waveform between the terminals of the DC motor or a current waveform of the DC motor, a circuit is provided which supplie... | 10/17/2006 |
| 7061201 | System for controlling the speed of a motor of an electric fan unit, notably for an automobile heating and/or air conditioning installation The invention relates to a system for controlling the speed of a motor (1) of an electric fan unit comprising a field-effect transistor (3) that controls the motor (1) using pulse-width modulation, the field-effect transistor (3) being co... | 06/13/2006 |
| 7053570 | Control circuit for a dual directional direct current motor employing a single alternating current power source A control circuit operates a dual directional DC motor from an AC power source. A controller has first and second position indication inputs adapted to receive respective first and second position indications. The controller also has first and second direction outpu... | 05/30/2006 |
| 7034477 | Domestic electrical appliance including an electric motor Domestic electrical appliance, including a universal electric motor powered by direct current via an electrical circuit linked to a DC electrical voltage source, said circuit including a chopper arrangement, including a capacitor in parallel with the DC voltage sour... | 04/25/2006 |
| 7032696 | Electric vehicle A method for carrying out a boosting operation includes detecting that a boosting operation has been carried out for making a current value of an electric motor larger than a normal full open throttle value, detecting that an electric motor has not rotated, detectin... | 04/25/2006 |
| 7032776 | Vending machine bucket drive control The disclosed invention is a dispensing apparatus and method for dispensing product from a vending machine. The invention employs a motor for bi-directionally rotating a dispenser bucket between two bumpers which physically obstruct and limit the rotational travel, ... | 04/25/2006 |
| 7004456 | Engine speed limiter for a hoist A mobile service rig for wells includes a hoist powered by an internal combustion engine. In response to the hoist exerting a predetermined lifting force, the lifting force is limited by automatically limiting or reducing the speed of the engine. ... | 02/28/2006 |
| 6998804 | Electric motor with electronic brake A retarded electric motor designed as a series motor or an asynchronous motor having a squirrel cage rotor. A valve is provided for switching between motor operation and braking operation. During motor operation the motor is operated in a known configuration as seri... | 02/14/2006 |
| 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 |
| 6945427 | Self-learning depth logic for multi-depth vendor control The disclosed invention is a dispensing apparatus and method for dispensing product from a vending machine. The invention employs a product vend detector to sense when products are dispensed. A controller compares the occurrences of products actually dispensed to th... | 09/20/2005 |
| 6940243 | Method for commutating an electronically commutated DC motor, and motor for carrying out said method An improved method of commutating an electronically commutated DC motor shuts off application of power between the end of one current pulse and the beginning of the subsequent current pulse. Based upon the instantaneous rotation speed, one calculates at what instant... | 09/06/2005 |
| 6922032 | Electric motor control device In the driving operation of a sensorless three-phase motor to be used in a rotation at a comparatively low speed (approximately 2000 RPM or less) and to be bipolar driven, the number of rotations and a rotating position are accurately detected from an induced voltag... | 07/26/2005 |
| 6731082 | DC motor constant speed PWM control A pulse width modulated (PWM) output signal controller circuit is provided for controlling operation of an electronically commutated, direct current (DC) motor. This DC motor may be used for operating cooling fans in sensitive electronic equipment. The controller ci... | 05/04/2004 |
| 6268708 | Control apparatus for electric power steering system In control devices of electric power steering systems, steering characteristics are improved by control being carried out by means of a signal based on rotor speed or steering angle after failure of a torque sensor is detected. In the present invention, i... | 07/31/2001 |
| 6064162 | Circuit for automatic operation of a series brake upon power loss during a regenerative braking period An anti-regeneration circuit for preventing a regenerated current produced by an overhauling DC motor from setting a series brake. The anti-regeneration circuit includes a current blocking device 90 which blocks the flow of regenerated current in the cran... | 05/16/2000 |
| 6025683 | Motor control circuit for regulating a D.C. motor A motor control chip (62) for asserting the control signals used to regulate the energization of the windings of a DC motor. The motor control chip includes a tachometer (94) that receives pulsed signals that vary with the rotation of the motor rotor and ... | 02/15/2000 |
| 5828136 | Combined power system using a rotation speed and torque detector A combined power system includes an active power source and an auxiliary power source. The rotation speed signal of the active power source and the rotation torque difference between the active power source and an output shaft of the combined power system... | 10/27/1998 |
| 5654613 | Over drive control apparatus of direct current series motor The invention is made to provide a reliable driving system by solving the problem of the conventional apparatus caused by unstable current in the chopper transistor located at the low end of the field winding and armature winding. The over drive control a... | 08/05/1997 |
| 5160875 | DC motor controller with high reliability A power source circuit supplies positive and negative voltages to a DC motor. A first switching element is provided in a path for supplying a positive voltage from the power source circuit. A second switching element is provided in a path for supplying a ... | 11/03/1992 |
| 5124606 | Dual rotor with continuous/positioning reverse controls A driving motor, for continuous and positioning type operation, includes two different types of rotors, a main rotor and an auxiliary rotor, corresponding to the type of operation required. Both rotors are arranged within the field of a common stator and ... | 06/23/1992 |
| 5099184 | Electrical series motor with dynamic braking circuit To provide sufficient magnetization to the field of a series motor when the series motor is to be operated in dynamic braking mode, with a dissipating resistor or short circuit element (4) connected across the armature (5), a circuit connection is establi... | 03/24/1992 |
| 4985666 | Safety device for video cassette recorder Motor control apparatus comprised of a drive circuit for supplying drive current to a motor, an overload detector coupled to the motor for detecting the magnitude of the motor current to produce an output signal if that current exceeds a predetermined thr... | 01/15/1991 |
| 4904909 | Controller for electric clamp A controller for an electric clamp closes the clamp rapidly at first, then runs at a slower speed while contacting the workpiece, and speeds up again after contacting it, to close with full clamping force. Arrival of the clamp at the position for slowing ... | 02/27/1990 |
| 4851753 | Proportional motor control circuit A proportional control circuit for the direction and precise speed control of D.C. electric motors such as those used to drive camera tilt/pan mountings. The circuit applies current to D.C. motors in a push/pull proportional scheme whereby slewing speed i... | 07/25/1989 |
| 4816726 | Method of and arrangement for controlling and h-bridge electric motor A method of and an arrangement for controlling the operation of a reversible D.C. electric motor including a winding having two ends each of which is connected to both the positive and negative terminals of an electric current source through respective co... | 03/28/1989 |
| 4804893 | Electric braking control An apparatus for an electric drive vehicle which provides linear deceleration via electrical braking. The apparatus monitors vehicle speed and adjusts the duty cycle of a chopper circuit according to look-up tables. These table correlate vehicle speed and... | 02/14/1989 |
| 4776528 | Apparatus for positioning a takeup reel to receive the lead end of a web In a reel-to-reel web transport (such as a magnetic tape recorder), apparatus is provided for accurately positioning a takeup reel to receive the lead end of a web. The takeup reel is rotated in web supply and takeup directions by a brushless direct curre... | 10/11/1988 |
| 4725764 | Switch arrangement In connection with a switch arrangement for circuit-making and circuit-breaking, as well as for controlling the speed of, electric machines it is proposed to provide a double-pole circuit-maker and circuit-breaker safety switch and to connect it in series... | 02/16/1988 |
| 4698567 | Ribbon deck motor control Apparatus for adapting a common dc motor for use in a typewriter to drive the ribbon lift and advance functions. The motor is coupled by means of a set of gears to a shaft on which are mounted the ribbon advance gear and ribbon lift cams. Also mounted on ... | 10/06/1987 |
| 4677356 | DC motor drive control device A DC motor is connected across the mid-points of a bridge circuit which includes a switching device in each leg of the bridge. A forward or reverse motor direction drive current flows through the motor depending on the conducting states of the switching d... | 06/30/1987 |
| 4670694 | Capstan motor control circuit A capstan motor control circuit comprises a comparing circuit for comparing an instruction voltage dependent on an instructed low-speed search mode and a rotational speed voltage dependent on a present rotational speed of a capstan motor, a circuit for de... | 06/02/1987 |
| 4551659 | Trackside-controlled electric railway systems The trackside control includes a trackside d.c. power supply applied initially at low voltage (of selectable polarity, to determine the direction of vehicle motion along the track) and then increased (preferably with constant voltage-increase rate) to max... | 11/05/1985 |
| 4544869 | Electronic control circuit for bi-directional motion The disclosure provides an electronic motor control circuit which switches and amplifies to control a bi-directional electric motor, using a symmetrical circuit, each half of which consists of five transistors. The circuit has a logic level input and moto... | 10/01/1985 |
| 4518902 | Plugging electrical braking control circuit The invention pertains to a control system (46) for controlling the supply of power to a motor (12) to produce plugging electrical braking and current limit control, including a circuit (60) for controlling the direction of energization of the motor (12),... | 05/21/1985 |
| 4491197 | Speed control apparatus for A.C. elevator car drive motor An SCR bridge of an elevator speed control apparatus is connected between an induction motor 5 and two (R, S) of the three-phase power supply terminals. Two diagonally opposite legs of the bridge comprise single SCR's 25, 26, and the other two legs each c... | 01/01/1985 |
| 4489257 | Driving and braking system for electric motors A driving and braking system having solid state switches for use with an electric motor. A first switch in series with a motor armature carries current from a power supply to the motor during the driving operation. A second switch couples a voltage from t... | 12/18/1984 |
| 4486692 | DC Motor control circuit for drop-out of stopping pulses in recorder A control circuit for a DC capstan motor used for driving a tape having control signals thereon is adapted for accurate stopping of the tape during intermittent-motion operation. A frequency generator coupled to the motor generates a frequency signal whos... | 12/04/1984 |
