Analog Resolver Or Synchro Signal To Digital Signal Patents (Class 341/116)
  • Patent number: 10095244
    Abstract: A motor control device may include a position command output means, a first subtraction means that calculates and outputs a position deviation, a position control means, a second subtraction means that calculates and outputs a position deviation, a speed control means that outputs a torque command, a limiter limits the level of the torque command, a motor drive means, and a voltage fluctuation detection means. When the voltage fluctuation detection means detects that the voltage of said power source has dropped below a predetermined reference level, either the position command output means varies the position command so as to reduce the rotational speed of the motor and/or said position control means limits said speed command to be output.
    Type: Grant
    Filed: December 10, 2015
    Date of Patent: October 9, 2018
    Assignee: NIDEC SANKYO CORPORATION
    Inventors: Jun Otsuji, Akihiro Ito, Hirokazu Watanabe, Hideyuki Odagiri
  • Patent number: 10033397
    Abstract: In a semiconductor device, a sine wave signal is input to a first input part and a cosine wave signal is input to a second input part. A multiplexer alternately selects one of the sine wave signal and the cosine wave signal. An analog to digital converter converts the output signal of the multiplexer into a digital value. A switching circuit is coupled between at least one of the first and second input parts and the multiplexer. The switching circuit is configured to be able to invert the input sine wave signal or the input cosine wave signal, in order to reduce the angle detection error due to the non-linearity error of the A/D converter.
    Type: Grant
    Filed: January 10, 2016
    Date of Patent: July 24, 2018
    Assignee: Renesas Electronics Corporation
    Inventors: Kazuaki Kurooka, Yoshihiro Funato
  • Patent number: 9863786
    Abstract: A sensor interface operates to communicate a sensed quantity along one or more processing pathways and in different data representations. The signal representations can be swapped along one or more locations of the signal processing branches. These branches are independent from one another and combined at an interface component for transmission along a single path or node for a control unit.
    Type: Grant
    Filed: June 26, 2014
    Date of Patent: January 9, 2018
    Assignee: Infineon Technologies AG
    Inventors: Christian Reidl, Wolfgang Granig, Harald Witschnig, Dirk Hammerschmidt
  • Patent number: 9841283
    Abstract: An innovative path guidance system and method has been invented that in a preferred embodiment allows visually impaired people to follow a dynamically changing path that avoids obstacles and arrive at a destination with minimal intervention by a sighted guide. The disclosed invention has the leader set a track electronically, and employs but is not limited to haptic feedback and audible alerts used in combination or individually, to help the visually impaired person control his or her trajectory. The visually impaired follower can be following a leader setting the path in real time or following a path established by a guide at an earlier time and recorded.
    Type: Grant
    Filed: June 28, 2017
    Date of Patent: December 12, 2017
    Inventor: Gabriel Oren Benel
  • Patent number: 9760794
    Abstract: Techniques for a system, article, and method of low-complexity histogram of gradients generation for image processing may include histogram of gradients generation for image processing including the following operations: obtaining image data including horizontal and vertical gradient components of individual pixels of an image; associating the horizontal and vertical gradient components of the same pixel with one of a plurality of angular channels depending on the values of the horizontal and vertical gradient components; determining a gradient magnitude and a gradient orientation of individual angular channels after the horizontal and vertical gradient components are assigned to the channels; and generating a histogram of gradients by using the gradient direction and gradient magnitude of the angular channels.
    Type: Grant
    Filed: September 25, 2015
    Date of Patent: September 12, 2017
    Assignee: Intel Corporation
    Inventors: Teahyung Lee, Myung Hwangbo, Tanfer Alan, Omesh Tickoo, Ravishankar Iyer
  • Patent number: 9726501
    Abstract: An innovative path guidance system and method has been invented that in a preferred embodiment allows visually impaired people to follow a dynamically changing path that avoids obstacles and arrive at destination with minimal intervention by a sighted guide. The disclosed invention has the leader set a track electronically, and employs but is not limited to haptic feedback and audible alerts used in combination or individually, to help the visually impaired person control his or her trajectory. The visually impaired follower can be following a leader setting the path in real time or following a path established by a guide at an earlier time and recorded.
    Type: Grant
    Filed: August 6, 2015
    Date of Patent: August 8, 2017
    Inventor: Gabriel Oren Benel
  • Patent number: 9651933
    Abstract: A circuit is provided for detecting peaks of a sinusoidal input signal includes circuitry for generating first and second sinusoidal output signals that are out of phase with one another and with the sinusoidal input signal. A comparator block compares the sinusoidal output signals to determine instances where the amplitudes of the first and second sinusoidal output signals cross over each other. The sinusoidal output signals may lead the sinusoidal input signal somewhat so that, after taking into account processing delay, the indicated crossover instances substantially coincide with peaks in the sinusoidal input signal such that a trigger signal generated by the circuit accurately indicates the timing of the peaks.
    Type: Grant
    Filed: December 19, 2012
    Date of Patent: May 16, 2017
    Assignee: Magna E-Car Systems of America, Inc.
    Inventors: Thomas J. Wand, Roger Douglas
  • Patent number: 9391630
    Abstract: A signal convertor includes a first sensor configured to generate a first signal and a second signal and first and second multiplexers configured receive the first and second signals, respectively, and generate samples. The signal convertor also includes an analog-to-digital (A/D) convertor configured to convert the samples and a processor configured to multiply the samples by a sine vector and by a cosine vector and determine a magnitude of the first and second signals based upon the product of the samples and the sine vector and the product of the samples and the cosine vector. A method for converting a signal is also disclosed.
    Type: Grant
    Filed: June 13, 2014
    Date of Patent: July 12, 2016
    Assignee: Hamilton Sundstrand Corporation
    Inventors: James Saloio, Kanwalpreet Reen
  • Patent number: 9303972
    Abstract: A position-measuring device includes a code carrier having a first graduation track and a second graduation track, the second graduation track being an incremental graduation track. A first detector system is configured to scan the graduation tracks so as to generate first position signals. A second detector system is configured to scan the second graduation track so as to generate second position signals. A first position-processing unit is configured to process the first position signals so as to yield a first absolute position value. A second position-processing unit is configured to process the second position signals so as to yield a second absolute position value. The first position-processing unit is configured to feed an absolute auxiliary position value to the second position-processing unit. The second position-processing unit is initializable with the absolute auxiliary position value.
    Type: Grant
    Filed: September 17, 2013
    Date of Patent: April 5, 2016
    Assignee: DR. JOHANNES HEIDENHAIN GMBH
    Inventors: Johann Oberhauser, Bernhard Schmied, Jannik Jens Rosenlehner-Emde, Werner Schwaiger, Thomas Schweizer, Hubert Mayer, Marc Oliver Tiemann
  • Patent number: 9170136
    Abstract: Systems and methods for flow sensing in a conduit are provided. One system includes a flow disturber disposed in a flow conduit and configured to impart a flow disturbance to the fluid flow. The system further includes a plurality of flow sensors disposed in the flow conduit and responsive to flow characteristics in the flow conduit. The system also includes a frequency resolver configured to determine frequency information related to the fluid flow based on the flow characteristics. The frequency resolver uses one or more time sample windows to select data samples for use in determining the frequency information, wherein a length of one or more of the time sample windows is based at least in part on the flow characteristics. The system additionally includes a processor configured to determine a flow rate of the fluid flow in the flow conduit using the frequency information.
    Type: Grant
    Filed: November 5, 2013
    Date of Patent: October 27, 2015
    Assignee: Amphenol Thermometrics, Inc.
    Inventors: Ertugrul Berkcan, Ibrahim I. Kouada, Michael Klitzke, Nannan Chen
  • Patent number: 9106505
    Abstract: A digital filter for removing a PWM noise from a sampling data includes: an averaging filter. The sampling data is obtained by sampling a control amount of a control object, which is driven at a driving frequency in a PWM control manner, at a sampling frequency. The PWM noise includes fundamental and harmonic wave components. The averaging filter calculates an average of the sampling data, which is sampled most recent predetermined sampling times providing an averaging number. The sampling frequency and the averaging number are determined to satisfy a relationship that an absolute value of a difference between the sampling frequency multiplied by a predetermined first integer and the harmonic wave frequency is equal to the sampling frequency divided by the averaging number and multiplied by a predetermined second integer in a frequency range between zero and a Nyquist frequency when the fundamental and harmonic wave components are removed.
    Type: Grant
    Filed: December 2, 2014
    Date of Patent: August 11, 2015
    Assignee: DENSO CORPORATION
    Inventor: Takeshi Fujino
  • Patent number: 9059732
    Abstract: According to one aspect, a resolver-to-digital converter includes a first filter configured to receive a first delta-sigma modulated resolver input. A second filter is configured to receive a second delta-sigma modulated resolver input. A summing junction is configured to output a difference between a scaled output of the first filter and a scaled output of the second filter. A controller is configured to generate a controller output based on a product of a demodulator and an output of the summing junction. An integrator is configured to generate an estimated position based on the controller output. The resolver-to-digital converter also includes a compensator configured to generate a compensated estimated position based on the controller output and a compensation offset delay adjustment.
    Type: Grant
    Filed: March 21, 2013
    Date of Patent: June 16, 2015
    Assignee: Hamilton Sundstrand Corporation
    Inventor: Christopher J. Courtney
  • Publication number: 20150097709
    Abstract: According to one aspect, a resolver-to-digital converter includes a first filter configured to receive a first delta-sigma modulated resolver input. A second filter is configured to receive a second delta-sigma modulated resolver input. A summing junction is configured to output a difference between a scaled output of the first filter and a scaled output of the second filter. A controller is configured to generate a controller output based on a product of a demodulator and an output of the summing junction. An integrator is configured to generate an estimated position based on the controller output. The resolver-to-digital converter also includes a compensator configured to generate a compensated estimated position based on the controller output and a compensation offset delay adjustment.
    Type: Application
    Filed: March 21, 2013
    Publication date: April 9, 2015
    Applicant: Hamilton Sundstrand Corporation
    Inventor: Hamilton Sundstrand Corporation
  • Publication number: 20140253349
    Abstract: A window-enabled TDC and method of detecting phase of a reference signal. One embodiment of the window-enabled TDC includes: (1) a window generator configured to receive a reference signal and a clock signal, and (2) a TDC circuit coupled to the window generator and configured to be enabled based on the reference signal and disabled based on the clock signal.
    Type: Application
    Filed: March 11, 2013
    Publication date: September 11, 2014
    Applicant: NVIDIA CORPORATION
    Inventors: Dong-Myung Choi, Madhusudhan Sarda, Anu Subbaraman, Kwanjee Ng
  • Patent number: 8797195
    Abstract: The present invention is typically embodied as a portable handheld unit that generates synchro signals for input into synchro motors and other synchro devices. A primary genre of inventive application is the testing of hardware and software in synchro systems. The inventive unit typically includes a numeric keypad, an LCD display, a microcontroller, a serial-to-parallel binary data converter, and at least one digital-to-synchro converter. The keypad and display are used to enter decimal data. The microcontroller converts the decimal data to serial binary data. The serial-to-parallel binary data converter converts the serial binary data to parallel binary data. The digital-to-synchro converter(s) convert(s) the parallel binary data to synchro analog data. Some inventive embodiments implement plural digital-to-synchro converters individually corresponding to channels for independently outputting synchro signals. Each channel can represent a specific type of synchro operation, e.g.
    Type: Grant
    Filed: May 30, 2013
    Date of Patent: August 5, 2014
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: Bhavesh V. Patel
  • Patent number: 8775117
    Abstract: An encoder includes a detector, a first position data calculator, a first data converter, an approximation device and a third position data calculator. The first data converter is configured to convert a first position data calculated by the first position data calculator into second position data whose second width in bits is longer than a first width in bits of the first position data. The approximation device is configured to calculate an approximation function that derives position data when timing data is input, based on a plurality of the second position data converted by the first data converter at a plurality of successive sampling timings, respectively. The third position data calculator is configured to calculate third position data indicating a position of a detection target at an output timing, based on the approximation function calculated by the approximation device.
    Type: Grant
    Filed: September 22, 2011
    Date of Patent: July 8, 2014
    Assignee: Kabushiki Kaisha Yaskawa Denki
    Inventors: Hironobu Yoshitake, Jirou Muraoka
  • Patent number: 8633667
    Abstract: A motor speed determining circuit determining a rotation speed of a motor is provided and a processing of generating motor driving waveform is switched in accordance with the rotation speed of the motor. A resolver signal outputted from a resolver 2 is converted to a digital value by an R/D converter 3, and inputted to a computing circuit of resolver value correction 5 via an R/D conversion interface 4. A current value of a motor M is converted to a digital value by an A/D convertor 8. The computing circuit of resolver value correction 5 computes a resolver correction value of the inputted digital signal and calculates positional data from a corrected resolver value. The computing circuit of motor control computes a current instruction value from a motor current value subjected to digital conversion by the A/D converter 8 and a motor current instruction value etc.
    Type: Grant
    Filed: February 10, 2010
    Date of Patent: January 21, 2014
    Assignee: Renesas Electronics Corporation
    Inventor: Hisaaki Watanabe
  • Patent number: 8514110
    Abstract: This resolver digital converter 10 includes a band pass processing unit that is disposed between a conversion unit and a multiplication unit and passes only a signal of a predetermined band through processing performed with a period that is shorter than the sampling period of an analog-to-digital converter and corrects the gains of digital signals before being input to the multiplication unit by using gain correction values that are set based on the maximum value and the minimum value of each one of digital signals passing through the band pass processing unit.
    Type: Grant
    Filed: December 3, 2010
    Date of Patent: August 20, 2013
    Assignee: Honda Motor Co., Ltd.
    Inventor: Hisayoshi Takahashi
  • Patent number: 8514111
    Abstract: A digital-to-synchro converter (“DSC”) is a device that converts digital signals to analog signals suitable for use by a synchro device. A conventional DSC implements complex circuitry to take digital input and generate [V Sin({acute over (?)}t) Sin(?)] and [V Sin({acute over (?)}t) Cos(?)] analog signals, and a Scott-T transformer to transform these analog signals into [V Sin({acute over (?)}t) Sin(?)], [V Sin({acute over (?)}t) Sin(?+120)], and [V Sin({acute over (?)}t) Sin(?+240)] analog signals. An inventive DSC, as typically embodied, implements a microcontroller to take digital input and generate [V Sin({acute over (?)}t) Sin(?)] and [V Sin({acute over (?)}t) Sin(?+120)] digital signals, a digital-to-analog converter to convert these digital signals to [V Sin({acute over (?)}t) Sin(?)] and [V Sin({acute over (?)}t) Sin(?+120)] analog signals, and a regular transformer (i.e.
    Type: Grant
    Filed: June 4, 2012
    Date of Patent: August 20, 2013
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: Bhavesh V. Patel
  • Patent number: 8384570
    Abstract: A method is presented for converting the sine/cosine signals from an optical encoder into a high-resolution position signal for use by a position control system while eliminating common noise and error sources. The improved noise performance resulting from the alias-free demodulation of encoder signals improves precision and reduces power consumption in precision motion control applications. The adaptive compensation of harmonic distortion eliminates errors related to offset, gain and quadrature of the encoder channels. The interpolator is able to process encoder signals at extremely high resolution without the speed limitation of prior art encoder interpolators.
    Type: Grant
    Filed: May 11, 2010
    Date of Patent: February 26, 2013
    Assignee: Active Precision, Inc.
    Inventor: Bradley Hunter
  • Patent number: 8332451
    Abstract: A CORDIC processor has a plurality of stages, each of the stages having a X input, Y input, a sign input, a sign output, an X output, a Y output, a mode control input having a ROTATE or VECTOR value, and a stage number k input, each CORDIC stage having a first shift generating an output by shifting the Y input k times, a second shift generating an output by shifting X input k times, a multiplexer having an output coupled to the sign input when the mode control input is ROTATE and to the sign of the Y input when the mode input is VECTOR, a first multiplier forming the product of the first shift output and the multiplexer output, a second multiplier forming the product of the second shift output and an inverted the multiplexer output, a first adder forming the X output from the sum of the first multiplier output and the X input, and a second adder forming the Y output from the sum of the second multiplier output and the Y input.
    Type: Grant
    Filed: November 27, 2008
    Date of Patent: December 11, 2012
    Assignee: Redpine Signals, Inc.
    Inventors: Phanimithra Gangalakurti, Karthik Vaidyanathan, Partha Sarathy Murali, InduSheknar Ayyalasomayajula
  • Patent number: 8274414
    Abstract: An interface system between an RDC and a connected resolver dynamically matches an input range of the RDC to the output range of the resolver's output signals. The interface system may include methods and/or apparatuses to determine the amplitude of sinusoidal input signals presented to the RDC by the resolver and to compare the amplitude against high and low threshold values. A gain control signal may be generated, which may be corrected if the detected amplitude either exceeds the high threshold or falls below the low threshold. The gain control signal may be output to a circuit in the RDC or in the resolver that corrects any mismatch that occurs between the RDC input and the resolver output. For example, the gain control signal may control the amplitude of an excitation signal applied to a primary of the resolver or the gain control signal may be applied to an analog to digital converter at the input of the RDC to control its effective input range.
    Type: Grant
    Filed: December 10, 2009
    Date of Patent: September 25, 2012
    Assignee: Analog Devices, Inc.
    Inventors: Lalinda D. Fernando, Michael C. W. Coln
  • Patent number: 8237599
    Abstract: System and method for digitizing analog voltage signals. A first voltage signal may be received at a comparator. A ramp signal may be received at the comparator. The ramp signal may be generated by a ramp generator. An output signal may be generated by the comparator. The output signal may indicate whether the analog voltage signal or the ramp signal is greater. The output signal may be conveyed to logic circuitry by the comparator. Control information may be conveyed by the logic circuitry to the ramp generator. The ramp generator may generate the ramp signal based on the control information. The logic circuitry may determine a digital representation of the first voltage signal based on the output signal from the comparator and the control information.
    Type: Grant
    Filed: November 30, 2009
    Date of Patent: August 7, 2012
    Assignee: Standard Microsystems Corporation
    Inventors: Joe A. Marrero, Lynn R. Kern, Scott C. McLeod
  • Patent number: 8228217
    Abstract: A system and method for reducing noise in resolver-to-digital converters (RDC) using a cascaded tracking loop filter. In some embodiments, one or more tracking loop filters may be implemented in a cascade to attenuate carrier harmonic frequencies in the digitized output of an RDC. Where a plurality of tracking loop filters are implemented, the output of one tracking loop filter may be input into a successive tracking loop filter.
    Type: Grant
    Filed: July 29, 2010
    Date of Patent: July 24, 2012
    Assignee: Analog Devices, Inc.
    Inventors: Lalinda Fernando, Michael Coln
  • Patent number: 8193955
    Abstract: The inventive data conversion device is typically embodied as a modular unit including a PCBA and a frame that houses it. The PCBA includes a PCB and electronic components mounted thereon including a computer and one or more conventional conversion devices, viz., at least one conventional synchro-to-digital converter and/or at least one conventional digital-to-synchro converter. According to typical inventive synchro-to-digital conversion, analog synchro data (received from a synchro) is converted by the synchro-to-digital converter(s) to lower-level-format parallel-binary-angle digital synchro data, which in turn is converted by the computer to higher-level-format digital synchro data.
    Type: Grant
    Filed: October 29, 2010
    Date of Patent: June 5, 2012
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: Charles J. Hermann
  • Patent number: 8188896
    Abstract: 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 ?? AD converters. Multiplication units receive the digital signals outputted from the ?? AD converters. A subtraction unit subtracts the outputs of the multiplication units. A synchronous detection unit detects the output of the subtraction unit based on a synchronization signal synchronously. An angular velocity calculation unit adjusts a proportional gain of an output of the synchronous detection unit, compensates the phase thereof, and calculates the angular velocity of the rotating apparatus. A rotational angle calculation unit calculates a rotational angle by integrating the angular velocity. Cosine and sine output units output a cosine and a sine corresponding to the obtained rotational angle to the multiplication units, respectively.
    Type: Grant
    Filed: September 1, 2010
    Date of Patent: May 29, 2012
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kuniaki Sata, Makoto Shinohara, Eiji Sato, Hajime Tsuchiya
  • Patent number: 8159173
    Abstract: 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 ? based on rotation detection signals Sa, Sb transferred from the resolver. The control device supplies electric power to the travel motor based on the rotation angle output value ?. The RDC calculates “sin(???)” as an error deviation ? based on the signals Sa and Sb and the rotation-angle output value ?. The RDC calculates an angular acceleration by multiplying the error deviation ? with a gain (=Ka·Kb), and integrates the angular acceleration two times in order to obtain a next rotation-angle output value. A gain control part of the RDC decreases the gain when the judgment means judges that the travel motor rotates at a constant rotation speed.
    Type: Grant
    Filed: August 6, 2010
    Date of Patent: April 17, 2012
    Assignee: Denso Corporation
    Inventors: Shigenori Mori, Eiichiro Kawakami
  • Publication number: 20110304488
    Abstract: A system and method for reducing noise in resolver-to-digital converters (RDC) using a cascaded tracking loop filter. In some embodiments, one or more tracking loop filters may be implemented in a cascade to attenuate carrier harmonic frequencies in the digitized output of an RDC. Where a plurality of tracking loop filters are implemented, the output of one tracking loop filter may be input into a successive tracking loop filter.
    Type: Application
    Filed: July 29, 2010
    Publication date: December 15, 2011
    Applicant: ANALOG DEVICES, INC.
    Inventors: Lalinda FERNANDO, Michael COLN
  • Patent number: 8058833
    Abstract: Methods and apparatus are provided for deriving precision position and rate information for motors using relatively low precision analog sensors, and for implementing compensation techniques that overcome inherent sensor errors and rotor magnet flux tolerances.
    Type: Grant
    Filed: October 29, 2008
    Date of Patent: November 15, 2011
    Assignee: Honeywell International Inc.
    Inventor: Dean Wilkens
  • Publication number: 20110264046
    Abstract: The present invention relates to a method for ensuring a constant target speed of a battery driven electrical motor, the battery driven electrical motor being adapted to move a piston rod in an injection device so as to inject a set dose of medicine from the injection device, the method comprising the steps of setting a first target speed to be reached by the motor, determining whether the first target speed can be reached, and, if the first target speed can be reached, maintaining the first target speed until a set dose of medicine has been injected from the injection device, or if the first target speed cannot been reached, setting a second target speed.
    Type: Application
    Filed: July 1, 2011
    Publication date: October 27, 2011
    Applicant: Novo Nordisk A/S
    Inventors: Kim Nyholm, Bo Vestergård Jensen
  • Publication number: 20110254479
    Abstract: A rotation-position detection system according to the present invention is configured with a resolver mounted in a brushless motor and a motor controller. The motor controller outputs an excitation signal to the resolver and an A/D converter thereof alternately applies analogue/digital conversion to a sine wave signal and a cosine wave signal outputted from the resolver so that a rotation position of the motor is calculated.
    Type: Application
    Filed: October 20, 2010
    Publication date: October 20, 2011
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Ryo SAKAGUCHI, Makoto ITOI
  • Patent number: 8004276
    Abstract: A reference signal generation circuit generates a reference signal used in synchronous detection for removing an excitation signal component in an angle calculation section that converts a detection angle ? obtained from two-phase resolver detection signals output from a resolver, to a digital output angle ?. The reference signal generation circuit includes a first multiplier, a second multiplier, and an adder. The first multiplier multiplies one of the resolver detection signals sin ? sin(?t+??) by the sine value sin ? of the digital output angle ? obtained from the angle calculation section. The second multiplier multiplies the other resolver detection signal cos ? sin(?t+??) by the cosine value cos ? of the digital output angle ? obtained from the angle calculation section. The adder adds the output of the first multiplier and the output of the second multiplier to output the sum signal sin(?t+??) as the reference signal.
    Type: Grant
    Filed: December 19, 2008
    Date of Patent: August 23, 2011
    Assignee: Japan Aviation Electronics Industry Limited
    Inventors: Hisashi Nishimura, Kenichi Nakazato
  • Publication number: 20110133965
    Abstract: An angle detection device of the present invention includes: a stator which includes a plurality of salient pole portions which are formed on a flat sheet made of a magnetic material and are raised by bending, each salient pole portion constituting a winding magnetic core on which a winding member for excitation and a winding member for detection are mounted; and a rotor which is made of a magnetic material and is provided rotatably relative to the stator such that gap permeance between the rotor and each salient pole portion is changed due to the rotation of the rotor about a rotational axis of the rotor. According to the angle detection device of the present invention, it is possible to provide the angle detection device which can largely reduce the number of parts and can realize the reduction of cost and the enhancement of reliability.
    Type: Application
    Filed: June 9, 2009
    Publication date: June 9, 2011
    Applicant: TAMAGAWA SEIKI CO., LTD.
    Inventors: Yoshimi Kikuchi, Kanji Kitazawa, Hisashi Mimura
  • Publication number: 20110102214
    Abstract: A rotation angle detecting device for a motor includes a first capacitor connected in parallel with a first winding of a rotor of the motor, and a second capacitor connected in parallel with a second winding of the rotor. The second capacitor has a capacitance different from that of the first capacitor. A rotation angle calculator of the rotation angle detecting device counts a number of amplitude changes of current detected by a current detector. The rotation angle calculator increases or decreases a value of the counting in accordance with a rotation direction detected by a rotation direction detector.
    Type: Application
    Filed: October 6, 2010
    Publication date: May 5, 2011
    Applicant: DENSO CORPORATION
    Inventor: Toshiaki UDA
  • Publication number: 20110090104
    Abstract: 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 ?? AD converters. Multiplication units receive the digital signals outputted from the ?? AD converters. A subtraction unit subtracts the outputs of the multiplication units. A synchronous detection unit detects the output of the subtraction unit based on a synchronization signal synchronously. An angular velocity calculation unit adjusts a proportional gain of an output of the synchronous detection unit, compensates the phase thereof, and calculates the angular velocity of the rotating apparatus. A rotational angle calculation unit calculates a rotational angle by integrating the angular velocity. Cosine and sine output units output a cosine and a sine corresponding to the obtained rotational angle to the multiplication units, respectively.
    Type: Application
    Filed: September 1, 2010
    Publication date: April 21, 2011
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Kuniaki Sata, Makoto Shinohara, Eiji Sato, Hajime Tsuchiya
  • Publication number: 20110068960
    Abstract: A resolver apparatus and method are provided. The apparatus comprises a source generation unit for generating a uni-phase source signal to excite a resolver, wherein said source generation unit comprises a low distortion oscillator, a variable phase shifter, and a capacitive resolver driving network; and a signal output unit for generating a two-phase output signal, wherein said signal output unit comprises the resolver, a signal detector and level adjuster, an angular position measurement unit, and an angular position compensation unit. The method comprises generating a source signal to excite a resolver; transmitting the source signal through a variable phase shifter; transmitting the source signal through at least one capacitive passive element serially connected to each coil winding of the resolver; outputting a displacement signal generated by the resolver to a resolver-to-digital converter; and converting said displacement signal into a digital position using the resolver-to-digital converter.
    Type: Application
    Filed: November 18, 2010
    Publication date: March 24, 2011
    Inventor: Cheon Soo Park
  • Publication number: 20110063145
    Abstract: A multiturn rotary encoder includes: a single-turn unit, including a code carrier and a single-turn evaluation unit for processing single-turn position signals to form a single-turn code word; a first multiturn unit, including at least one first multiturn code carrier and a first multiturn evaluation unit for processing first multiturn position signals to form a first multiturn code word that indicates the number of revolutions covered by input shaft; and a second multiturn unit, including at least one second multiturn code carrier and a second multiturn evaluation unit for processing second multiturn position signals to form a second multiturn code word that likewise indicates the number of revolutions covered by the input shaft. The functioning of the multiturn units is ascertainable by the multiturn code words generated independently of each other.
    Type: Application
    Filed: August 30, 2010
    Publication date: March 17, 2011
    Inventors: Elmar Mayer, Erich Strasser, Hermann Hofbauer
  • Publication number: 20110057821
    Abstract: Disclosed are an apparatus and method for sensing a rotor position, and an electric power steering system using the same.
    Type: Application
    Filed: September 1, 2010
    Publication date: March 10, 2011
    Inventor: Hyeok Kim
  • Publication number: 20110057822
    Abstract: A pulse generating device includes a rotatable disc having a plurality of patterns that are formed on a surface of the rotatable disc in a circumferential direction of the rotatable disc, and three pulse generators to each detect the plurality of patterns formed on the rotatable disc and to respectively generate three pulse signals each corresponding to a rotational speed of the rotatable disc based on the detected patterns. The three pulse generators are evenly spaced at intervals of 120 degrees of angle with respect to a rotational axis of the rotatable disc in the circumferential direction of the rotatable disc.
    Type: Application
    Filed: September 7, 2010
    Publication date: March 10, 2011
    Inventor: Tatsuya WATAHIKI
  • Publication number: 20110037627
    Abstract: The inventive data conversion device is typically embodied as a modular unit including a PCBA and a frame that houses it. The PCBA includes a PCB and electronic components mounted thereon including a computer and one or more conventional conversion devices, viz., at least one conventional synchro-to-digital converter and/or at least one conventional digital-to-synchro converter. According to typical inventive synchro-to-digital conversion, analog synchro data (received from a synchro) is converted by the synchro-to-digital converter(s) to lower-level-format parallel-binary-angle digital synchro data, which in turn is converted by the computer to higher-level-format digital synchro data.
    Type: Application
    Filed: October 29, 2010
    Publication date: February 17, 2011
    Applicant: The United States of America as represented by the Secretary of the Navy
    Inventor: Charles J. Hermann
  • Patent number: 7864075
    Abstract: A rotary electrostatic encoder comprising a disk-shaped fixed plate having a first transmission electrode, a second transmission electrode, and four reception electrodes; a disk-shaped rotating plate having a first induction electrode superposed on and facing the first transmission electrode, and a second induction electrode positioned on the inside of the first induction electrode and superposed on and facing the second transmission electrode, a portion of the second induction electrode being a protruding eccentric circular part; transmission means for applying a transmission signal between the first transmission electrode and the second transmission electrode; and signal processing means for generating an output signal relating to the absolute rotational displacement of the rotating plate on the basis of two signal components generated from the four reception electrodes.
    Type: Grant
    Filed: April 6, 2009
    Date of Patent: January 4, 2011
    Assignee: Seidensha Corporation
    Inventor: Masahiko Gondo
  • Patent number: 7817070
    Abstract: 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 plurality of sensors. A second tier multiplexer selects its inputs from the outputs of the first tier multiplexers. The output of the second tier multiplexer feeds a high speed A/D converter. Thus, the A/D converter is time share multiplexed by the second tier multiplexer. In this manner, a plurality of sensors can share a single A/D converter. After allowing a settling time for the multiplexers and antialiasing filters, a plurality of samples of the input signals are taken, such as for one period. The samples of each AC input signal are multiplied by a sine vector and a cosine vector. The product vectors are then each averaged and the root mean square of the two averages yields the magnitude of the input signal.
    Type: Grant
    Filed: August 28, 2008
    Date of Patent: October 19, 2010
    Assignee: Hamilton Sundstrand Corporation
    Inventor: John E. Games
  • Patent number: 7773008
    Abstract: 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 plurality of sensors. A second tier multiplexer selects its inputs from the outputs of the first tier multiplexers. The output of the second tier multiplexer feeds a high speed A/D converter. Thus, the A/D converter is time share multiplexed by the second tier multiplexer. In this manner, a plurality of sensors can share a single A/D converter. After allowing a settling time for the multiplexers and antialiasing filters, a plurality of samples of the input signals are taken, such as for one period. The samples of each AC input signal are multiplied by a sine vector and a cosine vector. The product vectors are then each averaged and the root mean square of the two averages yields the magnitude of the input signal.
    Type: Grant
    Filed: August 28, 2008
    Date of Patent: August 10, 2010
    Assignee: Hamilton Sundstrand Corporation
    Inventor: John E. Games
  • Patent number: 7768431
    Abstract: 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 excitation signal and a controller 36 that controls a digital angle output ? to make a deviation (sin(???)), which is the output of the synchronous detection circuit, zero.
    Type: Grant
    Filed: December 19, 2008
    Date of Patent: August 3, 2010
    Assignee: Japan Aviation Electronics Industry Limited
    Inventors: Kenichi Nakazato, Hisashi Nishimura
  • Patent number: 7692566
    Abstract: 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 to detect angle information of the rotor. The resolver further includes a controller which outputs angle information at a zero cross point of the output signal detected by the rotary transformer. The resolver can provide high detection accuracy and be low in cost.
    Type: Grant
    Filed: April 29, 2008
    Date of Patent: April 6, 2010
    Assignee: Aisan Kogyo Kabushiki Kaisha
    Inventor: Tetsuji Inoue
  • Patent number: 7663520
    Abstract: An A/D conversion apparatus performs motor current detection in an A/D conversion period corresponding to two phases out of three phases of a sinusoidal drive motor, using reduced register resources while minimizing the number of A/D converters. The A/D conversion apparatus includes: a selection unit selecting one of a plurality of input channels; an A/D converter converting an analog signal from the selected input channel to a digital signal; a start register holding a start channel number of sequential conversion; an end register holding an end channel number of the sequential conversion; a prohibition information holding unit holding prohibition information indicating an input channel to be excluded from the sequential conversion; and a control unit causing the selection unit to select, in channel number order, input channels corresponding to channel numbers from the start channel number to the end channel number except the input channel indicated by the prohibition information.
    Type: Grant
    Filed: August 28, 2008
    Date of Patent: February 16, 2010
    Assignee: Panasonic Corporation
    Inventors: Yuji Sugihara, Hisashi Kikue, Masaru Kohara
  • Patent number: 7652602
    Abstract: Interface unit for voltage input signals comprising two or more input channels. The input signals of these two or more input channels are connected alternately by an analog multiplexer to an analog-to-digital converter. The A/D converter comprises an integrated sigma-delta modulator circuit which generates a digitized 1-bit signal representing the input signal voltage level for a control unit irrespective of whether the input channel signal is digital or analog. By means of the invention all input voltage channels are made similar such that the input channels of the interface unit can receive an analog or digital signal irrespective of each other.
    Type: Grant
    Filed: February 8, 2008
    Date of Patent: January 26, 2010
    Assignee: ABB Oy
    Inventor: Erkki Miettinen
  • Publication number: 20090160687
    Abstract: 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 excitation signal and a controller 36 that controls a digital angle output ? to make a deviation (sin(???)), which is the output of the synchronous detection circuit, zero.
    Type: Application
    Filed: December 19, 2008
    Publication date: June 25, 2009
    Applicant: Japan Aviation Electronics Industry Limited
    Inventors: Kenichi Nakazato, Hisashi Nishimura
  • Patent number: 7549916
    Abstract: An aircraft cabin pressure control system and the method implement a technique that oversamples and filters a sensed cabin pressure signal, and then differentiates the oversampled and filtered pressure signal to generate cabin pressure rate-of-change. The oversampling and filtering technique removes circuit and sensor induced noise from the cabin pressure signal, and results in cabin pressure rate-of-change values with less noise than currently known systems and methods.
    Type: Grant
    Filed: July 8, 2005
    Date of Patent: June 23, 2009
    Assignee: Honeywell International Inc.
    Inventors: Darrell W. Horner, Gerard L. McCoy, Timothy C. Biss
  • Patent number: 7541951
    Abstract: 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 error between the input and output angles is in the vicinity of 180°, i.e., where response becomes low, there are provided a detected signal sign judging section (41) that judges signs of rotation detection signals to determine a quadrant where the input angle exists, and an output angle correcting section (42) for comparing an angle region of the output angle and the quadrant of the input angle to detect a state where the angle error is excessive, judging that the control response is low and carrying out a process for compensating the output angle.
    Type: Grant
    Filed: February 25, 2008
    Date of Patent: June 2, 2009
    Assignee: Japan Aviation Electronics Industry Limited
    Inventor: Hisashi Nishimura