Did You Know...
...that one person who claimed to be the inventor of the television is Russian emigre Vladimir Zworykin? In 1929 David Sarnoff, founder of RCA, asked Zworykin what it would take to develop TV for commercial use. He said: a year and a half and $100,000. In reality, it took 20 years and $50 million! Before his death in 1982 at the age of 92, Zworykin said of his invention: "The technique is wonderful. It is beyond my expectations. But the programs! I would never let my children even come close to this thing."
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| Number | Title | Issue Date |
| 8159173 | Control device for controlling travel motor of vehicle A control device for a travel motor mounted to a vehicle has a resolver which works as a rotation-angle sensor. The control device has a RDC which calculates a rotation-angle output value φ based on rotation detection signals Sa, Sb transferred from the resolver. T... | 04/17/2012 |
| 7863850 | Apparatus, system, and method for simulating outputs of a resolver to test motor-resolver systems An apparatus, system, and method are provided for simulating outputs of a resolver. One apparatus includes an adjustable sine waveform generator for simulating first and second sine wave signals, and an adjustable cosine waveform generator for simulating first and c... | 01/04/2011 |
| 7859215 | Motor controller, control system, and control method A motor controller includes a reference signal generator; an A/D converter performing A/D conversion of the cosine and the sine signals outputted from a resolver; a first amplitude calculator calculating cosine and sine signal amplitudes based on twice-A/D converted... | 12/28/2010 |
| 7459872 | High speed motor control The present invention relates to an apparatus and method for generating digital electrical signals which are representative of the angular position and rotational velocity of a rotatable shaft or similar movable mechanical component in a servomechanism. In particula... | 12/02/2008 |
| 7408315 | Motor control apparatus, motor control circuit, and method thereof A motor control apparatus for controlling a motor based on an output from a sensor includes a storage unit storing a value according to an excitation power supply to excite the sensor, a PWM output unit outputting a PWM output signal having a pulse width modulated t... | 08/05/2008 |
| 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 |
| 7372223 | Electric drive control apparatus and method An electric drive apparatus has an electric motor having a rotor and a stator; and a magnetic pole position detecting portion having a sensor rotor attached to the rotor, and a sensor stator that is adjacent to the stator, and that is fixed to a case, and that exten... | 05/13/2008 |
| 7362070 | Electric motor control system including position determination and error correction A system for controlling an electric motor includes a controller and a position indicator that provides position information regarding at least one motor component to the controller. The controller utilizes phase relationships indicative of the position information ... | 04/22/2008 |
| 7312590 | Model railroad velocity controller Control over velocity of a model train may be determined based upon the speed of rotation of a control knob. A processor receives electronic pulses indicating rotation of the knob beyond a predetermined increment of angular distance. The processor calculates the amo... | 12/25/2007 |
| 7307392 | Method and apparatus for processing the output signal of an encoder An apparatus for processing a signal output by an encoder, including a frequency multiplication unit to repeatedly multiply each of frequencies of two sinusoidal signals with a phase difference of approximately 90 degrees by a predetermined number a predetermined nu... | 12/11/2007 |
| 7301333 | Angle position detection apparatus An angle position detection apparatus according to the present invention includes: a unipolar resolver and a multipolar resolver installed so that reluctance is changed in synchronization with the revolution of a direct motor drive; and a select switch is used to sw... | 11/27/2007 |
| 7298109 | Electric power steering apparatus, and method for detecting abnormality of angle detector thereof An electric power steering apparatus which comprises: an angle detector for outputting a sine wave signal and a cosine wave signal corresponding to a rotor position of a brushless DC motor; and a torque detector for detecting a steering torque applied to a steering ... | 11/20/2007 |
| 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 |
| 7262521 | Variable AC voltage regulation control method and apparatus A method and apparatus is disclosed for providing a regulated voltage output from a variable voltage source, alternately using saturation control and cancelling control to regulate output. ... | 08/28/2007 |
| 7263452 | Resolver-to-digital converting apparatus, method and program A resolver-to-digital converting apparatus calculates a resolver rotational angle from two-phase sampling values that are the result of sampling two-phase output signals, which are obtained from a single-phase-excited, two-phase output resolver, at peak timings of a... | 08/28/2007 |
| 7259524 | Apparatus and methods for regulating delivery of electrical energy Apparatus and methods for regulating delivery of electrical energy to a lighting load are disclosed. An electrical waveform is received from a source of electrical energy. An integration value is generated based on a square of an amplitude of the received waveform. ... | 08/21/2007 |
| 7227320 | Disc drive apparatus and motor driver circuit A motor driver circuit according to the present invention comprises an edge signal generation means for generating an edge signal indicating the timing of phase-switching according to the values of a plurality voltages induced when driving the motor and a drive volt... | 06/05/2007 |
| 7224139 | Servo driver and encoder signal processing IC A servo driver (3) includes: an input section (11) for input-specifying the type of an encoder (7) at the side of an actuator (2); a control section (13) for generating a control signal (12) according to the type input; and ... | 05/29/2007 |
| 7197945 | Torque direction detecting device for brushless motor A torque direction detecting device for an electric motor includes a resolver which provides a pair of a sin θ signal and a cos θ signal with θ changing from 0 degree to 360 degrees in electric angle according to rotation of the brushless motor, a circuit which c... | 04/03/2007 |
| 7193380 | Method for rotating a printer paper-feed roller A method for rotating a printer paper-feed roller wherein the roller is driven by a DC (direct current) motor. A feedback-control signal is applied to the motor until the roller reaches a desired rotational position. The feedback-control signal is a function of an e... | 03/20/2007 |
| 7183750 | Vehicle power-generation control unit and vehicle power-generation control system The vehicle power-generation control unit has a first function enabled when a control signal received from outside designates a first mode to control an exciting current such that an output power of a vehicle generator is kept at a value specified by the control sig... | 02/27/2007 |
| 7164251 | Oscillation adjuster and oscillation adjusting method A vibration controller controls vibrations generated in a driven object included in a system subject to vibrations due to the dynamic unbalance or eccentricity of a rotating member driven for rotation by an electric motor. An angular position transforming unit (4... | 01/16/2007 |
| 7157906 | Double variable reluctance resolver for a multiple speed resolver system A double variable reluctance resolver in which a redundancy is given to a variable reluctance resolver to improve reliability. The double variable reluctance resolver also functions as a multiple speed resolver system. ... | 01/02/2007 |
| 7138795 | Rotation angle detector and its temperature correcting method A first sin phase voltage representing the rotational angle of a resolver is derived from the sum of a rotational angle voltage involving a temperature component and a bias voltage. The rotational angle voltage and the bias voltage are calculated by calculating the ... | 11/21/2006 |
| 7119536 | Two-resolver deviation angle detector having serially connected output windings A deviation angle detector enlarges the application range by enlarging the detectable deviation angle range. The deviation angle detector has two resolvers, which have rotors, stators, and single excitation windings and multiple output windings that are coiled aroun... | 10/10/2006 |
| 7076352 | Electric power steering apparatus and angle compensating method therefor An electric power steering apparatus includes a first resolver whose pole pair number is ‘m’ and a second resolver whose pole pair ‘n’. The electric power steering apparatus further includes a torsion calculating means which calculates the a torsion angle of... | 07/11/2006 |
| 7047153 | Method and apparatus for improved inspection classification of attributes of a workpiece An apparatus for detecting the probable existence, location, and type of defects in a workpiece is described. The apparatus includes a sensor subsystem, an optimizer, a control subsystem, and a computer system having a processor and computer readable memory. Sensor ... | 05/16/2006 |
| 7042190 | Motor control apparatus and motor control method A control device measures time intervals T1 to T12 from the reference time until when each of the rotational angles θbn1, θbn2 output from each of resolvers becomes n×60 degrees (n=1 to 12, i.e., 60 degrees to 720 degrees). Then, the c... | 05/09/2006 |
| 7015840 | Resolver/digital converter An R/D converter allows high precision detection of a rotation angle of a rotor axis of a resolver having high rates of rotation. An A/D converter is built into a digital signal processor and converts a sine wave and cosine wave output from the resolver. An axis ang... | 03/21/2006 |
| 7016744 | Man-machine interface A man-machine interface is provided for a domestic appliance in which remotely sensed buttons, slider bars, marker pucks and a knob are used. The sensing coils for remotely sensing the positions of the buttons, slider bars, marker pucks and the knob are formed on a ... | 03/21/2006 |
| 7012399 | Position detector correction method and electrically-powered steering apparatus This invention provides an electrically-powered steering apparatus capable of assisting a steering torque appropriately using a resolver. A reference signal is applied to a resolver arithmetic processing I/F circuit 34 and a resolver arithmetic processing I/F... | 03/14/2006 |
| 7009385 | Flux compensated rotational position detector and operating methods therefor A flux compensated rotational position detector includes a rotating element having a plurality of magnetic poles extending over its entire periphery, and a fixed element having a plurality of protruding fixed-element magnetic poles with fixed-element magnetic pole t... | 03/07/2006 |
| 6995538 | Rotational direction detecting apparatus for a three-phase brushless DC motor A region judging circuit judges an electric angle region of a three-phase brushless DC motor based on an output signal of a resolver. A latch timing output circuit determines an optimum latch timing. A driving direction judging circuit judges a rotational direction ... | 02/07/2006 |
| 6996482 | Device and method for determining the position of a rotor The invention relates to a device and a method for determining an electrical starting rotor angle of an electromotor. According to the invention, the electromotor (10) is subjected to an approximately sinusoidal voltage and the corresponding current path (i) ... | 02/07/2006 |
| 6954050 | Control method and control device of permanent-magnet type synchronous motor The object of the invention is to inhibit the axial displacement caused by the insufficiency of a control response angular frequency of a frequency arithmetic unit of a synchronous motor and realize high-precision torque control also in acceleration/deceleration. To... | 10/11/2005 |
| 6935194 | Dual resolver device A dual resolver device that includes a first resolver having a first rotary shaft, and a second resolver having a second rotary shaft, wherein the absolute value of a difference between a shaft angle multiple of the first resolver and a shaft angle multiple of the s... | 08/30/2005 |
| 6931918 | Device and method for determining the rotary orientation of a motor through use of a resolver signal derived from the rotary orientation Described are methods and devices for determining the rotary orientation of a motor using a resolver signal derived from the rotary orientation of the motor. In particular, the methods and devices utilize a single control system that is arranged both for triggering ... | 08/23/2005 |
| 6922028 | Controller for permanent magnet motor Disclosed is a control device of a permanent magnet electric motor which makes it possible to synchronously control the permanent magnet electric motor even when the magnetic pole logarithm of the permanent magnet electric motor is not an integral multiple of the nu... | 07/26/2005 |
| 6912427 | Programmable limit switch with distributed intelligence A programmable limit switch includes output channels for receiving position data, each position value of the position data representing an incremental advance of a workpiece through a production field, and for producing actuation signals. The channels are connectabl... | 06/28/2005 |
| 6909290 | Rotor angle detecting apparatus for DC brushless motor An inspection voltage imposer generates an inspection voltage by multiplying fundamental voltage string data in which a certain voltage output pattern where an average of output voltage levels in one period becomes 0 is set by data of a modulation signal whose value... | 06/21/2005 |
