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 |
| 8188896 | Digital converter for processing resolver signal According to one embodiment, a digital converter is provided to process output signals of a resolver attached to a rotating apparatus. These output signals are converted into digital signals by ΔΣ AD converters. Multiplication units receive the digital signals out... | 05/29/2012 |
| 7817070 | Method and apparatus for sampling and converting a signal A signal conditioning circuit time share multiplexes anti-aliasing filters and an A/D converter. A plurality of first tier multiplexers each time share multiplex one of a plurality of antialiasing filters between a plurality of AC or baseband input signals from a pl... | 10/19/2010 |
| 7773008 | Method and apparatus for sampling and converting a signal A signal conditioning circuit time share multiplexes anti-aliasing filters and an A/D converter. A plurality of first tier multiplexers each time share multiplex one of a plurality of antialiasing filters between a plurality of AC or baseband input signals from a pl... | 08/10/2010 |
| 7768431 | R/D converter and angle detecting apparatus A band elimination filter 35 that eliminates or reduces a low frequency noise superposed on resolver signals S1 and S2 is provided between a synchronous detection circuit 34 that performs synchronous detection by referring to an excitatio... | 08/03/2010 |
| 7692566 | Angle detection device A resolver includes an excitation signal generator which generates a sine wave and a cosine wave as an excitation signal, a rotor which receives the excitation signal, and a rotary transformer which detects an output signal of the rotor, the resolver being arranged ... | 04/06/2010 |
| 7541951 | Tracking loop type digital angle converter and angle/digital converting apparatus A tracking loop type digital angle converter that operates so that a deviation between input and output angles always becomes zero by feeding back the output angle to the input angle, wherein in order to eliminate a case where a control deviation decreases an angle ... | 06/02/2009 |
| 7489260 | Resolver hall decoding circuit A device for converting position data to Hall code data includes a data input for providing the position data, a data output for providing the Hall code data, a first adder circuit operative to provide a sum of a first predetermined number and a value provided by th... | 02/10/2009 |
| 7432836 | Multiplexed signal conditioner A signal conditioning circuit time share multiplexes anti-aliasing filters and an A/D converter. A plurality of first tier multiplexers each time share multiplex one of a plurality of antialiasing filters between a plurality of AC or baseband input signals from a pl... | 10/07/2008 |
| 7417571 | Method for providing a correlation A method for providing a correlation between a periodic analog/digital conversion and an angle-synchronous signal, in which the periodic analog/digital conversion is provided with a timing mark, which correlates with the angle-synchronous signal, and is assigned to ... | 08/26/2008 |
| 7382295 | Control unit for electric power steering apparatus Since an abnormality is judged by executing a square calculating process with respect to sin θ and cos θ for detecting an abnormality in an angular resolver, a processing time is elongated, and a burden to a CPU is great. Since the invention prepares a map which c... | 06/03/2008 |
| 7352305 | Method and circuit for interpolating encoder output Two-phase sinusoidal signals QA, QB output from an encoder are interpolated by sample-and-hold (S/H) circuits and A/D conversion (ADC) circuits, and data D is output in accordance with a data request signal RQ from exterior. For this interpolation of encoder output,... | 04/01/2008 |
| 7352304 | Interpolation apparatus in encoder An interpolation apparatus in an encoder includes an analog-to-digital converter for digitizing a sine wave signal and a cosine wave signal, respectively. An amplitude level detecting circuit detects each amplitude level of the digitized sine wave signal and cosine ... | 04/01/2008 |
| 7338422 | Folding and threading station of a folding box gluing machine and method of moving the threading station A folding box gluing machine contains one upper and lower transport belt disposed on each side of the machine. A lower transport belt is guided in a roller cheek and an upper transport belt is guided in a roller rail. A central roller cheek and a central roller rail... | 03/04/2008 |
| 7340370 | Resolver signal processing device A resolver signal processing device includes a control portion, a resolver, and an input/output portion. The control portion includes a memory for storing sine wave data for two cycles, and a DMA controller for transmitting to the resolver the excitation signal incl... | 03/04/2008 |
| 7330138 | Asynchronous sample rate correction by time domain interpolation A circuit is provided to correct a sample rate by way of time domain interpolation having a first circuit loop having an up/down counter configured to receive an input signal and a feedback signal and an adder configured to receive the output signal from the up/down... | 02/12/2008 |
| 7327587 | System and method for power conversion An ac-ac power converter system is provided for supplying power to an electrical load. The ac-ac power converter system provides an output voltage having variable amplitude and/or frequency. The ac-ac power converter system includes a boost inductor for applying a d... | 02/05/2008 |
| 7321113 | Precision material-handling robot employing high-resolution, compact absolute encoder An absolute encoder employs multiple sub-encoders of different resolutions and a linking algorithm for combining the sub-encoder outputs to form an accurate, high-resolution position estimate. The sub-encoders can utilize edge modulation of a main grating track, slo... | 01/22/2008 |
| 7292179 | Instantaneous passive range finding A method and apparatus for use in determining the range in a single time sample from a platform to a target are disclosed. The method includes receiving radiation emanating from the target at two points on the platform in a common time sample; detecting the received... | 11/06/2007 |
| 7286068 | Method and system for detecting failures in an analog-to-digital converter A method for detecting failures in an analog-to-digital converter includes monitoring a series of outputs from an analog-to-digital converter and detecting a failure in the analog-to-digital converter when a specified number of consecutive outputs comprise a same va... | 10/23/2007 |
| 7276831 | Split-pole field-match motor An electric motor having a plurality of rotor and stator poles, the poles of one element being alternately polarized and neutralized due to the use of direct current and alternating current windings on each pole. The poles of like current are connected in series, an... | 10/02/2007 |
| 7268710 | Logic device for the transformation of the output of the RDC into series A-B pulses A logic device for the transformation of the output of the RDC into series A-B pulses according to the present invention comprises: a chip with its two minimal bits (LSB-LSB-1) simulating as the clock source of A-B pulses, a signal-processing pin (BUSY) which... | 09/11/2007 |
| 7262578 | Direct control of an induction motor This invention relates to sensorless control (i.e. without encoder at the motor shaft) of an induction motor (AC asynchronous motor). In particular, the invention comprises a method for a direct measurement of the electromotive forces (EMF) at the stator of the moto... | 08/28/2007 |
| 7258655 | Gathering and pressing device for a folded box-gluing machine A gathering and pressing device for a folded box gluing machine has two machine-width, circulating conveyor belts which are connected to a drive and whose conveying runs are disposed horizontally, one above the other and running parallel to each another. An upper co... | 08/21/2007 |
| 7253395 | Absolute encoder employing concatenated, multi-bit, interpolated sub-encoders An absolute encoder employs multiple sub-encoders of different resolutions and a linking algorithm for combining the sub-encoder outputs to form an accurate, high-resolution position estimate. The sub-encoders can utilize edge modulation of a main grating track, slo... | 08/07/2007 |
| 7205916 | Digital method and apparatus for resolving shaft position An apparatus and method for determining an angular position of a shaft are disclosed, which comprise resolving an excitation signal at an excitation frequency into at least two orthogonal signals, converting the orthogonal signals to a digital estimate, for each of ... | 04/17/2007 |
| 7203718 | Apparatus and method for angle rotation An angle rotator uses a coarse stage rotation and a fine stage rotation to rotate an input complex signal in the complex plane according to an angle θ. The coarse stage rotation includes a memory device storing pre-computed cosine θM and sine θM | 04/10/2007 |
| 7199727 | Electrostatic encoder and electrostatic displacement measuring method An electrostatic encoder comprises a movable element having electrodes and a stator having induction electrodes and potential detection electrodes. The electrostatic encoder further comprises a voltage driving circuit configured to apply a voltage to the induction e... | 04/03/2007 |
| 7196643 | Resolver arrangement A resolver arrangement that is inexpensive and yet offers high resolution and high noise rejection includes a carrier signal generator and two processing channels each of which has an analog input connected a different one of the stator coils and a channel output. E... | 03/27/2007 |
| 7194394 | Method and apparatus for detecting and correcting inaccuracies in curve-fitted models A technique for detecting and correcting inaccuracies in curve-fitted models. Humps and dips in a curve-fitted model are identified. An analysis is performed on the humps and dips to determine if they are large enough to warrant correction. If so, then the source of... | 03/20/2007 |
| 7187309 | Angle computation method and apparatus for variable reluctance resolver In an angle computation method and apparatus for a variable reluctance resolver, the maximum values Vsin(max) and Vcos(max) of sine and cosine output voltages in respective positive value ranges and the minimum values Vsin(min) and V... | 03/06/2007 |
| 7126514 | Inverter control device and inverter control method An inverter control microcomputer 10 comprises AD converters 21–23, a selector control circuit 31, and a selector 32. The selector 32 selects three analog signals from among inputted seven analog signals in accordance with contro... | 10/24/2006 |
| 7123175 | Angle detection apparatus computing phase differences between first and second phase angles A resolver use angle detection IC subjected to a phase lock operation so as to follow not an angle θ(t) for detection, but a phase angle ωot±θ(t) having an offset of a frequency ωot in the phase lock units. For this reason, when the excitation frequency ωot is... | 10/17/2006 |
| 7119717 | Encoder output divider and R/D converter A Resolver/Digital (R/D) converter includes an encoder output divider having a DSP generating 14-bit encoded signals A2 and B2 from a timing analysis performed during the first period of 12-bit encoded signal A1. The DSP generates a selection si... | 10/10/2006 |
| 7102317 | Method and apparatus to process an analog encoder signal A method and apparatus to process an analog encoder signal. The apparatus includes an analog encoder pattern generating unit, an analog encoder pattern storage unit, a digital/analog converting unit, a comparing unit, a recent state latch unit, a present state deter... | 09/05/2006 |
| 7084790 | Device to effectuate a digital estimate of a periodic electric signal, related method and control system for an electric motor which comprises said device A device for effectuating a digital estimate of a periodic electric signal is described. The device comprising a linear DAC having an output signal, a comparator that compares the output signal of the linear DAC with the periodic electric signal, and logic circuitry... | 08/01/2006 |
| 7081730 | Motor controller system for large dynamic range of motor operation A motor controller system uses a rotary sensor with a plurality of signal conditioning units, coupled to the rotary sensor. Each of these units, which is associated with a particular range of motor output shaft rotation rates, generate a feedback signal indicative o... | 07/25/2006 |
| 7064692 | Solid-state synchro/resolver converter Methods and systems for simply and inexpensive converting the signals of solid-state sensors for use by analog systems and indicators. An embodiment of the system receives a DC voltage value from at least one sensor, converts the DC voltage value into one or more an... | 06/20/2006 |
| 7053682 | Device and method for clock generation A clock generator includes an interface for receiving a plurality of n periodical signals of the same frequency which are phase-shifted with respect to each other, wherein n/3. Further, a clock signal generator is provided for generating respective clock edges of a ... | 05/30/2006 |
| 7054296 | Wireless local area network (WLAN) technology and applications including techniques of universal frequency translation Frequency translation and applications of same are described herein, including wireless local area network (WLAN) applications such as IEEE Standard 802.11 WLANs. Such applications include, but are not limited to, frequency down-conversion, frequency up-conversion, ... | 05/30/2006 |
| 7049776 | Rotor-position sensor assembly and method for detecting a rotor position An electric motor has a stator and an external rotor (40). Its external rotor (40) has a sensor magnet (54) having a plurality SP of sensor poles (55). The motor also has: at least one rotor position sensor (42, 44) for generating ... | 05/23/2006 |
