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 |
| 7352094 | 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... | 04/01/2008 |
| 7218073 | Fan motor speed control circuit A fan motor speed control circuit is disclosed. The circuit includes a digital/analog converting unit and a driving unit. The digital/analog converting unit takes charge of receiving a pulse width modulation (PWM) signal and converting it into a voltage signal. The ... | 05/15/2007 |
| 7190145 | Method and apparatus for improving speed measurement quality in multi-pole machines A method and apparatus for improving speed measurement quality in systems having multi-pole machines is taught. The method compensates for pole misalignment by computing speed based upon moving average techniques. In one embodiment, a moving average speed averaged o... | 03/13/2007 |
| 7183732 | Motorized barrier operator system for controlling a stopped, partially open barrier and related methods A motorized barrier operator that moves a barrier between limit positions, includes a motor for moving the barrier between set limit positions. When the barrier is in a stopped, partially open position the operator implements at least a hybrid control sequence that ... | 02/27/2007 |
| 7151349 | Fan speed control A method of synchronizing a pulsed drive signal applied to a DC fan motor to the TACH output of the motor is described. DC motors include a rotor that rotates in a path defined by a plurality of magnetic poles and the method defines an ideal TACH output for a specif... | 12/19/2006 |
| 7142125 | Fan monitoring for failure prediction A method for monitoring a fan comprises measuring power usage of the fan, determining a derivative of the measured fan power usage, tracking the derivative over time, and predicting impending fan failure based on the tracked fan power usage derivative. ... | 11/28/2006 |
| 7109677 | Motorized barrier operator system for controlling a barrier after an obstruction detection and related methods A method for controlling a motorized barrier operator after detecting an obstruction includes the steps of providing a motorized barrier operator that moves a barrier between limit positions and providing at least one control switch that upon actuation moves the bar... | 09/19/2006 |
| 7102313 | Apparatus and method for providing protection to electric traction motor of vehicle An apparatus provides protection to an electric traction motor of a vehicle. The vehicle has a first powertrain and a second powertrain. The first powertrain includes an engine and it is coupled with a first set of road wheels. The second powertrain includes the ele... | 09/05/2006 |
| 7095188 | Serial fan set and rotation speed-matching curve generation method thereof A serial fan set and rotation speed-matching curve generation method thereof are provided. The serial fan set comprises a rotation speed control module, a first fan and a second fan, in which the rotation speed control module is used to receive the power signal and ... | 08/22/2006 |
| 7084596 | Servomotor driving controller A servomotor driving controller capable of highly accurate machining, which prevents a quadrant projection upon change in the quadrant where machining is made. After the position deviation converges to zero by means of learning control, the velocity command or a dif... | 08/01/2006 |
| 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 |
| 7075290 | Tachometer apparatus and method for motor velocity measurement A method and apparatus for determining the velocity of a rotating device is described herein. The apparatus includes a magnet assembly affixed to a rotating shaft of a rotating device and a circuit assembly. The circuit assembly includes a circuit interconnection ha... | 07/11/2006 |
| 7015671 | Circuit for operating an electric motor A circuit configuration for operating an electric motor is described, the circuit configuration containing a timer. As a function of a first differential signal between a setpoint signal and an actual value signal, a regulator supplies a first switch signal for feed... | 03/21/2006 |
| 6998813 | Device for generation of a signal dependent on rotational speed for an electric motor, in particular for an electronically-commutated DC motor The invention provides a device to generate an rpm-dependent signal, or a tachogenerator, having a plurality of magnet elements with alternating polarity which are arranged and distributed around the circumference of the rotor shaft. The magnet elements preferably t... | 02/14/2006 |
| 6995532 | System and method of controlling cooling fan speeds A cooling fan includes a fan, a motor coupled to the fan to drive the fan and a microcontroller. The microcontroller is connected to the motor and is capable of detecting a speed of the fan in real time and maintaining a constant speed of the fan regardless of chang... | 02/07/2006 |
| 6967453 | Method and apparatus for controlling fan motor A method and an apparatus for controlling a fan motor which is arranged to arranged to cool an object to be cooled and to be controlled by an inverter whose output is connected to the fan motor. The method of the invention comprises steps of determining the temperat... | 11/22/2005 |
| 6963184 | Adaptable spatial notch filter A spatial notch filter is described that adapts in accordance with changes to an angular velocity of a rotating component within a manufacturing system. In a manufacturing system, noise may appear in feedback signals due to spatially distributed physical features in... | 11/08/2005 |
| 6940245 | Downhole compressor system with a feedback sensor A downhole compressor system is disclosed for assisting in extracting gas from the well. The system comprises a compressor 14, an electric motor 10 for driving the compressor 14 which motor has a stator winding and a rotor 12 and, in use,... | 09/06/2005 |
| 6931306 | System and method of designing cooling fans A method of programming behavior of at least one cooling fan includes installing the at least one cooling fan within a housing. Operating parameters of the at least one cooling fan are set. Operation of the at least one cooling fan within the housing is conducted ba... | 08/16/2005 |
| 6850023 | Method of measuring motor speed A speed sensor for an electric motor detects the variation in the electric field of the armature due to commutation to produce an output signal indicative of the speed of rotation of the motor. ... | 02/01/2005 |
| 6803735 | Speed-based open-loop start-up method for brushless DC motor A method of starting a brushless DC motor 12 at any initial speed (A) establishes a initial stator-field speed and setting a counter of synchronization, (B) measures a speed of a rotor of the motor, (C) compares the speed of the rotor with the stator-field sp... | 10/12/2004 |
| 6778938 | Fan speed detection in the presence of PWM speed control A circuit is arranged to pulse-width modulate the duty cycle of a power supply signal that is used to control the rotational speed of a fan in a temperature-controlled system. The control system includes an edge detector for monitoring a tachometer signal that is pr... | 08/17/2004 |
| 6667590 | Power window apparatus with function of foreign object detection The apparatus comprises a motor, a motor driver, a pulse generator, an MCU incorporating a memory, and an open/close switch. The MCU compares the motor load torque detected at the time of opening or closing the window, with a reference value stored in the... | 12/23/2003 |
| 6528987 | Method and apparatus for determining fan speed An operating circuit (1) for controlling the speed of a cooling fan motor (3) for computer cabinetry (7), and for determining an under-speed condition in the fan motor (3) comprises a control circuit (15) which controls a variable output signal generator ... | 03/04/2003 |
| 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 |
| 6420846 | Power drive unit with stall sensor A power drive unit having drive roller elements that transport cargo and a sensor that detects motion of the cargo, e.g., the speed at which the cargo is transported, where the sensor operates substantially independently of the motion of the-drive roller ... | 07/16/2002 |
| 6400113 | Apparatus and method for monitoring fan speeds within a computing system Apparatus for monitoring fan speeds within a computing system includes a tachometer turning with the fan, providing a tachometer signal including a number of pulses during each revolution of the fan. This tachometer signal is provided as an input to a sig... | 06/04/2002 |
| 6366039 | Excimer laser device An excimer laser device which is capable of keeping the rotational speed of a fan constant and uniformizing a laser gas flow between main discharge electrodes even when the pressure of a laser gas filled in a casing varies. The excimer laser device includ... | 04/02/2002 |
| 6326758 | Integrated diagnostics and control systems An integrated control and diagnostics system for a controlled system (e.g., a motor) includes a diagnostics module and a controller coupled to the motor. To optimize operation, the diagnostics information signal is used to modify the control provided by t... | 12/04/2001 |
| 6265843 | Detection of saturation status for non-synchronous incremental actuators using a variable position estimate window A method for controlling non-synchronous actuators using a first and second estimate of the position of the actuator to create a variable position estimate window between which the actual position of the actuator is always bound. The first and second esti... | 07/24/2001 |
| 6262549 | Fan speed pulse filter for a PWM fan A fan speed pulse filter is used for a PWM fan. The filter comprises a comparator, a latch circuit and a synchronizer. The fan unit, including a tachometer pulse output, is controlled by a PWM signal for determining the fan speed. By comparing the PWM sig... | 07/17/2001 |
| 6225770 | Method for the control of motor driven adjustment devices in motor vehicles High resolution and accuracy of the measured values for detection of the position, speed and/or acceleration of a drive is ensured. The tolerances are determined and considered in signal evaluation on a partitioned basis. Measurement errors caused by inac... | 05/01/2001 |
| 6097165 | Method and apparatus for handling brake failure in variable frequency drive motors The variable frequency drive of a motor monitors pulse generator feedback while the motor is stopped and an electromechanical brake is set. When the pulse generator feedback exceeds a predetermined level indicative of brake failure, tie controller actuate... | 08/01/2000 |
| 6008605 | Method for determining the active power of asynchronous electric motors A method for determining the active power (P) of asynchronous electric motors of winning and conveying equipment in underground mining. According to the invention, particularly easy and accurate determination of the instantaneous active power of the motor... | 12/28/1999 |
| 5880566 | Absolute angular position calculation apparatus for a rotating motor and velocity control apparatus adopting the same An absolute angular position calculator for a rotating motor and a velocity control apparatus adopting the same, in which a separate pulse generator is not used. The motor is manufactured so that a modified frequency generator generates a modified frequen... | 03/09/1999 |
| 5764008 | Drive device for closing parts in motor vehicles Drive device for closing parts in motor vehicles, especially sliding roofs, sliding/lifting roofs, and the like, with a drive motor, a sensor for determining the actual rpm of the drive motor and a clamping protection means for disengaging or for reversin... | 06/09/1998 |
| 5757156 | Opening/closing device for automobile door An opening/closing device for an automobile door comprising a speed sensor for detecting a moving speed of a door, a motor for applying an opening/closing assisting force to the door, and a control unit for controlling the driving of the motor, is provide... | 05/26/1998 |
| 5369344 | Tachometer for determining the speed of a motor A motor control system accurately and reliably controls the speed of a motor so that the motor operates in accordance with a predetermined motor speed profile, and therefore does not exceed a predetermined safe speed, decelerates at a controlled rate, mai... | 11/29/1994 |
| 5262703 | Low noise miniature electric motor A low noise brushless dc motor has a rotor with a permanent magnet and a stator with a bearing system mounting a shaft for rotating the rotor. The motor has an operating circuit that includes a tachometer winding connected to the base of a first transisto... | 11/16/1993 |
| 5248897 | Safety window for car A safety window for a car which is capable of being automatically moved to its window closing position when the car speed exceeds a predetermined speed. The safety window comprises a control device for controlling the operation of the power window, which ... | 09/28/1993 |
