Did You Know...
...that in 1800 ether was first used by partyers as a fun diversion? Sniffing the gas led to hilarious and raucous laughter as people watched each other become more and more intoxicated and silly. Several doctors independently realized the value ether would have to anesthetize surgery patients. Of those who claimed rights to the "discovery," none had a happy ending. One had a seizure and died defending his rights. Another spent his life in an asylum because he had been denied acclaim. A third became addicted to chloroform and, in a New York City jail, he soaked a cloth in the drug, severed an artery and bled to death.
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| Number | Title | Issue Date |
| 8180202 | Robot, reference voltage generator circuit used in transmission path for robot, and hub incorporating reference voltage generator circuit A robot including a controller and multiple servos, each acting as an actuator, and a supply voltage generator circuit connected to a transmission line between the controller, which controls using the RS485 communication protocol, and the servos. The reference volta... | 05/15/2012 |
| 8050544 | Electronic device for regulating the voltage across a high-side load The invention relates to an electronic control device for regulating the voltage across a high-side load, especially for regulating a fan in a motor vehicle, with a control voltage (V1) which is referenced to system ground and which is mirrored to the positiv... | 11/01/2011 |
| 7370541 | Torque detecting apparatus A torque detecting apparatus detects torque applied upon a torsion bar of an electric power steering apparatus, as two sensors, which have ratiometric characteristics and have the same characteristics, simultaneously detect the amount of torsion of the torsion bar. ... | 05/13/2008 |
| 7310959 | Method for actuating a fan using a plurality of characteristic curves and a control program for controlling the power of the fan The present invention relates to control of a fan during which the power of the fan is determined from the characteristic curves of the fan motor, the operating parameters of the cooling system and the reference variables which are predefined in the form of temperat... | 12/25/2007 |
| 7249503 | Tube and die interface for liquid flow sensing through the tube A thermal sensor includes a die having a surface formed to accept the outer surface of tubing; a molded plastic part located on the die surface, said molded plastic part including flexible portions having a surface adapted to engage the bottom half of the circumfere... | 07/31/2007 |
| 7187853 | Speed control of a d.c. motor The invention relates to a circuit and a method for the speed control of a d.c. motor, particularly the speed control of a fan driven by this d.c. motor, which is used as part of an air distribution system in passenger and commercial motor vehicles. The circuit for ... | 03/06/2007 |
| 7098617 | Advanced programmable closed loop fan control method A fan control system and method that maintains the operating temperature of computer and electronic devices or components at about a predetermined control level to minimize power consumption and audible noise. The fan control system is a programmable closed loop sys... | 08/29/2006 |
| 7078871 | Method for determining the effective resistance of a DC motor and open loop voltage mode controlling of a DC motor A method for determining an effective resistance of a voltage controlled DC motor having a nominal resistance includes driving the DC motor with a signal so that the DC motor has a targeted acceleration, and sensing an effective acceleration of the DC motor. The eff... | 07/18/2006 |
| 7038420 | Method of regulating an electric motor and corresponding electric motor A method of regulating an electric motor, regulation being implemented with a loop of gain less than unity as a function of a divergence between a setpoint signal for an operating parameter of the motor and a measured value of the same operating parameter of the ele... | 05/02/2006 |
| 7012400 | Control circuitry for controlling rotational speed of a DC motor A control circuitry, electrically connected to a DC motor and a variable voltage source for modulating a rotational speed of the DC motor. The control circuitry includes a voltage reference component and a switching circuit. The voltage reference component is electr... | 03/14/2006 |
| 6949900 | MCU control for brushless DC motor A processor for controlling a sensorless, brushless DC motor is disclosed comprising a first output for providing a control signal to a potentiometer controlling the speed and voltage of the DC motor. The processor also includes a second input for receiving a back-E... | 09/27/2005 |
| 6876184 | Circuit arrangement for measuring the current consumption of a transistor-controlled load The invention relates to a circuit arrangement for measuring the current consumption of a transistor-controlled load, in particular of an electromotor, whereby a load current (IL) is detected by measuring the controlling current (IT2) of an out... | 04/05/2005 |
| 6555982 | Method and system for detecting an object in the path of an automotive window utilizing a system equation The presence of an object in the path of an automotive vehicle window is detected. This is accomplished by sensing or observing a system variable, such as speed or motor current, and comparing this measured value to a predicted limit value of the system v... | 04/29/2003 |
| 6437530 | Method for electronic surveillance and control of the opening and closing procedure for electrically operated units A method for the electronic monitoring and control of the opening and closing operation of electrically operated aggregates, particularly of window lifters and sunroofs in motor vehicles, is described. A regulating unit of the aggregate is connected to a ... | 08/20/2002 |
| 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 |
| 6064165 | Power window or panel controller A controller for energizing a power-operable element, such as a sunroof, window, door, vehicle seat, a component of a major appliance or of a machine or of a conveyor system. The disclosed controller senses both hard and soft obstructions and de-activates... | 05/16/2000 |
| 5764009 | Motor control device in electric motor-operated vehicle An electric motor control for a series-wound DC motor for providing speed control and also for controlling regenerative braking. The regenerative braking is energized either when the accelerator pedal is released and/or when a brake pedal is depressed. In... | 06/09/1998 |
| 5061884 | Current limiting control circuit for D.C. motors with line dropout protection In accordance with a first embodiment of the invention, line dropout protection is provided for a d.c. motor wherein motor operation is prevented if power is applied at the time a main speed control device is not set in a zero position. Re-enabling motor ... | 10/29/1991 |
| 5043640 | RC speed controller A speed controller includes a housing adapted to be mounted in a radio controlled model car having a DC motor, a battery, and a receiver, and a control circuit for controlling the amount of votage supplied to the DC motor according to speed information su... | 08/27/1991 |
| 5016133 | Apparatus for flicker protection when a servo-motor starts An apparatus for flicker protection when a servo motor driven sewing machine starts utilizing comparators. Setting the original voltage as the reference voltage and the dropped voltage as the monitor voltage, the comparator compares the voltages and, if t... | 05/14/1991 |
| 4990002 | Motor control circuit A control circuit for maintaining power output of a motor, irrespective of amplitude changes in line voltage. The output of an amplifier is indicative of the line voltage. A ramp generator generates a ramp voltage which is consistent and repetitive, irres... | 02/05/1991 |
| 4918744 | Motor-driven power steering unit The motor-driven power steering unit according to the first aspect of the present invention is able to decrease the amount of current being applied to the motor if the steering force exceeds a predetermined level. The motor-driven power steering unit acco... | 04/17/1990 |
| 4903318 | Electric switch system for a power tool An electric switch system for a DC motor powered power tool, comprising: a moveable block which is adapted to be manually displaced between a first position and a second position for speed control of the motor; a fixed block arranged adjacent to the first... | 02/20/1990 |
| 4829230 | Motor control circuit for accurate speed control with capacitor leakage compensation A slow start motor control circuit for applications wherein extremely accurate speed control is required, such as, in a centrifugal blood separator application is disclosed. In a blood separator, the degree of separation of cellular components, such as re... | 05/09/1989 |
| 4806832 | Fan with temperature controlled rotation speed The invention employs a stabilization circuit including a longitudinal branch with a series connection of a Zener diode and a resistor and in the other longitudinal branch with the series connection of a transistor and where the motor winding of the drivi... | 02/21/1989 |
| 4774444 | Speed control circuit for an electric motor A speed motor control circuit for an electric motor of the type which drives a louvered sign assembly between predetermined rotational positions. The speed control includes a silicon controlled rectifier which is connected in series between the motor and ... | 09/27/1988 |
| 4583709 | Valves An electrically operated valve assembly comprises a valve, an electrical device 18 to operate the valve in one direction, and means 19 to prevent reverse current flow if the valve should drive the electrical device in reverse when the valve moves in a dir... | 04/22/1986 |
| 4559483 | Control device for increasing speed of actuation of an electromagnetic consumer, particularly in an internal combustion engine The actuation speed of an electromagnetic consumer is increased by means of a charged capacitor which is connected in series with a consumer at such a polarity that its voltage is added to that of the power source. In one embodiment, the capacitor is swit... | 12/17/1985 |
| 4470213 | Load bearing solar powered displays A power assembly for rotating a display is simple, inexpensive, has long life, and can rotate even heavy displays. A housing mounts a d.c. motor having an output shaft, and has a support structure. A ball bearing assembly, having a second shaft, is statio... | 09/11/1984 |
| 4392093 | Electronic control and regulating system An electronic control and regulating system for AC-operated appliances, especially universal motors and with symmetrical phase control. The control circuit includes among other things an inductive current-voltage converter 9, the primary side 8 of which i... | 07/05/1983 |
| 4388572 | Constant speed regulator for DC motors An electric motor is supplied a voltage from a control circuit. The control circuit is powered by an AC to DC rectifier having a shunt capacity. An increase in motor load will result in lower speed and an increase in current. This causes an increase in AC... | 06/14/1983 |
| 4330818 | Variable voltage direct current power supply and motor speed control A continuously variable voltage direct current power supply having first and second output terminals is provided using a variable transformer with a core of magnetically permeable material encircled by at least one electrical winding, with segments of win... | 05/18/1982 |
| 4284933 | Control circuit for reducing field voltage in D.C. motors A circuit arrangement is disclosed for reducing field voltage peaks in direct current motors which are energized by way of an electronic D.C. regulator, and which have an exciter winding connected with the armature and commutating pole windings by means o... | 08/18/1981 |
| 4218730 | Transistor switching apparatus for use in the control of a D.C. load A power switching apparatus for use in the control of a D.C. load such as a D.C. motor comprises a power transistor with its emitter-collector path connected in series with the D.C. motor and a battery. A base current of the power transistor is supplied f... | 08/19/1980 |
| 4085594 | Control system for cooling tower fans A control system for automatically controlling the operation of a plurality of fans for a cooling tower so that the minimum number of fans and the lowest speeds are used to provide the required cooling necessary at any one time. The fans are individually ... | 04/25/1978 |
| 4035703 | Current circuit arrangement for reducing the switch-on power dissipation of a power transistor The current circuit arrangement is used to reduce the switch-on power dissipation of a power transistor which intermittently switches a direct-current voltage to an ohmic-inductive load and in which a voltage limiting diode is arranged parallel to the loa... | 07/12/1977 |
| 3997832 | Circuit for applying starting voltage to load A booster circuit applies a high voltage to a load for starting or energizing the load which is operated at a steady voltage once it has started. The booster circuit comprises a power source, a diode or a resistor provided in forward direction with respec... | 12/14/1976 |
| 3991349 | Droop adjustable control apparatus for direct current motor drives A field-controlled direct current motor is provided with a circuit responsive to armature current which is adjustable as to the amount of armature current representative signal, and the adjusted current representative signal is used to provide a selected ... | 11/09/1976 |
| 3942114 | Speed detector and indicator for DC motors A speed detector for a direct current motor is coupled substantially in parallel with the motor such that only the motor input voltage and a function of the input current are inputs to the speed detector/indicator system. Analog speed detection is provide... | 03/02/1976 |
