Motor Or Generator Fault Patents (Class 324/765.01)
  • Patent number: 11500001
    Abstract: An insulation resistance detection circuit and method are disclosed. The circuit includes a controller configured to: open a first relay, and close second relays, or switch an on/off status of at least one of the second relays; determine, based on a first measurement value between a positive input terminal of an inverter circuit and an earthing point, whether the positive input terminal of the inverter circuit is short-circuited or has low resistance to protective earthing; and determine, based on a second measurement value between a negative input terminal of the inverter circuit and the earthing point, whether the negative input terminal of the inverter circuit is short-circuited or has low resistance to protective earthing, where the first relay is one of in M relays and is connected to at least one impedor in parallel, and the second relays are relays other than the first relay in the M relays.
    Type: Grant
    Filed: September 27, 2021
    Date of Patent: November 15, 2022
    Assignee: Huawei Digital Power Technologies Co., Ltd.
    Inventors: Chen Wang, Xiaowei Xie, Yang Hu
  • Patent number: 11387767
    Abstract: A torque-limiting safety circuit servo drive for AC permanent magnet motors including a three-phase inverter bridge, a first current sensor in series with a first motor phase, a second current sensor in series with a second motor phase, a third current sensor in series with the DC bus, and a drive control circuit that controls the six pulse-width modulated gate drive signals for the three-phase inverter bridge. The drive circuit has first and second safety channel STO inputs whereby either channel can shut down the three-phase inverter bridge, emits a signal set to represent the switching state of the three-phase inverter bridge, and modifies the switching pattern of the PWM to ensure the dwell times of PWM is sufficiently long to allow a valid measurement of phase current using the bus current sensor. First and second safety processors controls the first and second safety channel STO inputs, respectively.
    Type: Grant
    Filed: July 10, 2020
    Date of Patent: July 12, 2022
    Assignee: Kollmorgen Corporation
    Inventor: Robert Pearce
  • Patent number: 11378947
    Abstract: A system for monitoring operation of rotating electrical machinery including electrical industrial machinery. The system comprises analog sensors configured to measure electrical signals corresponding to the voltage and the current of the rotating electrical machinery. A remote processor identifies the frequency components of the measured electrical signals. Based on the frequency components, the system is monitored and controlled. This may help allow electrical faults, mechanical faults and process faults to be predicted and/or prevented.
    Type: Grant
    Filed: July 2, 2020
    Date of Patent: July 5, 2022
    Assignee: AB Cognitive Systems Inc.
    Inventor: Amir Badkoubeh
  • Patent number: 11366944
    Abstract: A system for evaluating an electromagnetic performance of a permanent magnet (PM) motor. Parameters update an electromagnetic analytical (EA) model. Each component of the PM motor is associated with regions, and assumptions of the EA model include a relative permeability of regions associated with a rotor core modeled as finite. Calculate a general solution to a governing equation to each region which include unknown coefficients to be determined. Define a set of boundary and interface (B&I) conditions for two neighboring regions, each B&I condition is defined through a set of Maxwell equations using the two neighboring regions sets of assumptions, geometries of the PM motor and electrical and magnetic properties associated with the two neighboring regions. All the unknown coefficients in the general solutions in all regions are solved with a linear system of equations obtained from the B&I conditions between the regions, to solve for a magnetic vector potential.
    Type: Grant
    Filed: August 24, 2020
    Date of Patent: June 21, 2022
    Assignee: Mitsubishi Electric Research Laboratories, Inc.
    Inventors: Bingnan Wang, Kyung-Hun Shin
  • Patent number: 11353004
    Abstract: A method and a wind turbine are provided. The wind turbine includes a gearless generator that is a synchronous generator and includes a stator and a generator rotor. The wind turbine includes a generator filter with modifiable filter properties that is coupled to the stator and configured to filter a stator current. The wind turbine includes a filter controller configured to control the generator filter.
    Type: Grant
    Filed: June 7, 2018
    Date of Patent: June 7, 2022
    Assignee: Wobben Properties GmbH
    Inventors: Alfred Beekmann, Wojciech Giengiel, Simon Schrobsdorff
  • Patent number: 11356046
    Abstract: An electronic determination device is configured for determining at least one characteristic parameter of an electric machine with P phases, P?3, connected to an electric starter and including at least P-1 switching arms, each switching arm being connected to a respective phase of the electric machine. The determination device comprises a control module configured to control respective switching arm(s) to close and the other switching arm(s) to open, so as to generate a current injection on two phases of the electric machine; an acquisition module configured to acquire measurements of respective current(s) and voltage(s) for said two phases, further to the generation of the current injection; and a calculation module configured to calculate at least one characteristic parameter of the electric machine according to the respective current(s) and voltage(s) measurements.
    Type: Grant
    Filed: December 1, 2020
    Date of Patent: June 7, 2022
    Assignee: Schneider Toshiba Inverter Europe SAS
    Inventors: Thomas Devos, François Malrait
  • Patent number: 11349415
    Abstract: The present invention quickly stops rotation of an electric compressor while preventing damage to switching elements. An electric compressor 1 comprises a motor drive circuit 52 having multiple switching elements IGBT Q1 to Q6, a control unit 53 that controls driving of the multiple switching elements IGBT Q1 to Q6 and drives a motor 4, and a current detection unit 54 that detects a current flowing through the motor drive circuit 52. The control unit 53 performs stop control that stops rotation of the compression mechanism 3 by performing braking control that controls drive of predetermined switching elements IGBT (Q2, Q4, Q6 and the like) among the multiple switching elements IGBT Q1 to Q6.
    Type: Grant
    Filed: December 7, 2018
    Date of Patent: May 31, 2022
    Inventor: Junki Kawata
  • Patent number: 11342932
    Abstract: A data compression process reduces the amount of machine spectral data transmitted over a network while maintaining the details of spectral peaks used for machine health analysis. The data compression process also provides for the calculation of various types of spectral parameters, such as spectral band parameters, with negligible loss of accuracy.
    Type: Grant
    Filed: May 13, 2020
    Date of Patent: May 24, 2022
    Assignee: Computational Systems, Inc.
    Inventors: Anthony J. Hayzen, Stewart V. Bowers, III
  • Patent number: 11327106
    Abstract: A system for detecting a fault in a polyphase electrical network, characterized by the fact that it comprises a plurality of sensors distributed over the electrical network and suitable for measuring a parameter representative of the positive sequence voltage and/or the negative sequence voltage at each respective sensor and analyzing means suitable for analyzing the signals coming from the different sensors representative of the positive sequence voltage and/or the negative sequence voltage at each respective sensor, by searching for an extremum from among the signals coming from the sensors and for locating a fault at the sensor corresponding to this extremum.
    Type: Grant
    Filed: June 27, 2019
    Date of Patent: May 10, 2022
    Inventor: Boris Deneuville
  • Patent number: 11313916
    Abstract: A testability method for the in-flight testing of an operating state of an electronic power chain having at least one power converter intended for driving an electric motor that actuates at least one aircraft component includes controlling actuation of the converter, transmitting a test signal, collecting at least one measurement signal, and determining an operating state.
    Type: Grant
    Filed: December 6, 2019
    Date of Patent: April 26, 2022
    Assignee: Safran Nacelles
    Inventors: Moussa Bendjedia, Kambiz Tehrani, Ghaleb Hoblos, Alain Nourrisson, Julien Corbin, Hakim Maalioune
  • Patent number: 11303257
    Abstract: A current sensor integrated circuit to sense a current through a resistor includes a substrate, a tub disposed in the substrate, an analog front end disposed in the tub and comprising an amplifier having inputs coupled across the resistor and a charging circuit configured to bias the analog front end and the tub to a bias voltage that is a predetermined offset voltage greater than a common mode voltage associated with the resistor. In embodiments, the analog front end is biased to a first bias voltage and the tub is biased to a second, different bias voltage.
    Type: Grant
    Filed: March 27, 2019
    Date of Patent: April 12, 2022
    Assignee: Allegro MicroSystems, LLC
    Inventors: Steven Daubert, David J. Haas, Craig S. Petrie, Milan Valenta, Roman Prochazka, Richard Stary, Sina Haji Alizad
  • Patent number: 11280702
    Abstract: A shaft torque control device includes a feedback control system having: a generalized plant P including a nominal plant model N representing the input/output characteristic of a test system including a tandem dynamometer system; and a controller K for applying a first and second control inputs u1, u2 to the generalized plant P on the basis of a first observed output y1 and second observed output y2. The controller K has been designed using a computer so as to satisfy a prescribed design condition. For the generalized plant P, defined are: a first control amount output z1 resulting from weighting the first observed output y1 using a weighting function Ge(s); a second control amount output z2 resulting from weighting a front transmission torque t1 using a weighting function Gt1(s); and a third control amount output z3 resulting from weighting a rear transmission torque t2 using a weighting function Gt2(s).
    Type: Grant
    Filed: August 20, 2019
    Date of Patent: March 22, 2022
    Inventor: Takao Akiyama
  • Patent number: 11196379
    Abstract: A motor monitoring system includes a motor unit, a plurality of sensors, and a motor controller. The motor unit includes a motor housing and a motor arranged within the motor housing. The motor includes a stator with a plurality of stator poles each having a corresponding phase coil. The plurality of sensors are arranged within the motor housing and are configured to: measure a first characteristic related to partial discharges that occur at one or more phase coils, and generate sensor data based on the measured first characteristic. The motor controller is configured to generate a plurality of pulse width modulation (PWM) control signals for controlling phase voltages of the motor, detect the partial discharges at at least one of the phase coils based on the sensor data, and adjust at least one PWM control signal of the plurality of PWM control signals based on the detected partial discharges.
    Type: Grant
    Filed: March 9, 2020
    Date of Patent: December 7, 2021
    Inventor: Clemens Mueller
  • Patent number: 11186304
    Abstract: Method for detecting rail switches degradation and failures, the method having the steps of applying a Discrete Wavelet Transform to stored measurement data relative to a switch move to be analysed and obtaining a feature vector associated with said switch move and including Discrete Wavelet Transform coefficients delivered by the applied Discrete Wavelet Transform; comparing the obtained feature vector with feature vectors associated with rail switch moves previously obtained and associating each to a respective health class among several given health classes; and determining a health class for the said switch move to be analyzed by selecting one of the health classes associated with the previously obtained feature vectors based upon the comparison step.
    Type: Grant
    Filed: July 5, 2018
    Date of Patent: November 30, 2021
    Inventors: Nenad Mijatovic, Adrian Manoj Peter, Kaylen Jamal Bryan, Charlie Jinshaw Tian, Christina Mariah Coley
  • Patent number: 11171596
    Abstract: A short detection apparatus configured to detect a layer short in a motor in which a plurality of sets of multi-phase windings are independently disposed in a stator includes an acquisition unit configured to acquire electricity information corresponding to windings of individual phases in the sets of the multi-phase windings; and a determination unit configured to determine, based on the electricity information which the acquisition unit acquires with respect to windings of a mutually identical phase in the sets of the multi-phase windings, whether a layer short occurs in any one of the windings of the mutually identical phase.
    Type: Grant
    Filed: January 13, 2020
    Date of Patent: November 9, 2021
    Assignee: Fanuc Corporation
    Inventor: Yasuo Kawai
  • Patent number: 11137318
    Abstract: One embodiment can provide a method and a system for diagnosing faults in a physical system. During operation, the system obtains a time-domain model of the physical system and converts the time-domain model to the frequency domain to obtain a frequency-domain model of the physical system. The time-domain model can include one or more model parameters having known values. The system also obtains time-domain input and output signals and converts the time-domain input and output signals to the frequency domain to obtain frequency-domain input and output signals. The system identifies at least one model parameter having an expected value that is different from a known value of the at least one model parameter based on the frequency-domain model and the frequency-domain input and output signals, and generates a diagnostic output indicating at least one component within the physical system being faulty based on the identified at least one model parameter.
    Type: Grant
    Filed: July 9, 2018
    Date of Patent: October 5, 2021
    Inventors: Ion Matei, Aleksandar B. Feldman, Johan de Kleer
  • Patent number: 11112768
    Abstract: To provide a numerical controller and a machine learning device that predict an abnormality, based on machine learning with perception of temporal change in data. The numerical controller includes the machine learning device provided with a learning unit that conducts machine learning of trends in operation of a machine on occasions of occurrence of abnormalities in the machine, based on time-series data acquired by a data logger device and relating to the operation of the machine and abnormality information relating to the abnormalities which have occurred in the machine and a prediction unit that predicts an abnormality which will occur in the machine, based on results of the machine learning in the learning unit and time-series data acquired by the data logger device and relating to current operation of the machine.
    Type: Grant
    Filed: December 12, 2017
    Date of Patent: September 7, 2021
    Inventors: Mamoru Kubo, Toshinori Matsukawa, Kouichi Murata
  • Patent number: 11114968
    Abstract: A rotating electric machine apparatus including: a rotating electric machine (REM) including a rotor and a stator; an inverter device including an inverter circuit (IC) for driving the REM and an inverter control unit (ICU) for controlling the IC; a detector, in which a first antenna is connected to a resonance circuitry, which is mounted to the REM and has a resonance characteristic that changes depending on a change in a physical quantity; and a detection processor receiving a response radio wave indicating a detection result of the change in the physical quantity from the first antenna while transmitting a transmission radio wave at a set carrier frequency from a second antenna, and comparing the detection result and the set value, to thereby obtain an abnormal state in the REM. The ICU controls output of the IC in accordance with an abnormal state signal from the detection processor.
    Type: Grant
    Filed: November 24, 2017
    Date of Patent: September 7, 2021
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yoshihiro Miyama, Hideaki Arita, Junji Hori, Tomohira Takahashi, Kenzo Makino, Masaya Inoue
  • Patent number: 11081983
    Abstract: A method is for a machine having an alternating current (AC) power source with a first side (L1) and a second side (L2), two or more pairs of power switches, and one or more windings. The method comprises closing one pair of power switches by a control circuit to cause current to flow from a first side of the AC power source, through the one or more windings, and to the second side of the AC power source and closing another pair of power switches by the control circuit to cause current to flow from the second side of the AC power source, through the one or more windings, and to the first side of the AC power source.
    Type: Grant
    Filed: October 25, 2019
    Date of Patent: August 3, 2021
    Assignee: QM Power, Inc.
    Inventors: Charles J. Flynn, Cooper N. Tracy, W. Scott Hunter, Stephen B. Nichols
  • Patent number: 10910977
    Abstract: The present invention relates to a method for determining a state of a bearing of a three phase electric machine, the electric machine having a rotor, which is supported by the bearing, the electric machine being connected to a three phase inverter for supplying the electric machine with electric power, the three phase inverter being controlled to apply a pulse width modulation with a predefined scheme to create three phase currents, the method comprises: —determining a first phase current provided to the electric machine; —determining a second phase current provided to the electric machine, the second phase current being different to the first phase current; —determining the power spectral density of the park's vector based on the first phase current and the second phase current; —determining an amplitude of the power at a predefined frequency of the power spectral density, wherein the predefined frequency depends on the rotational speed of the rotor and the scheme of the pulse width modulation; —comparing t
    Type: Grant
    Filed: August 16, 2018
    Date of Patent: February 2, 2021
    Inventor: Davide Barlini
  • Patent number: 10871453
    Abstract: According to an embodiment, an inspection device comprises a moving body that includes; a moving main body which moves in contact with a first structure; arms attached to the moving main body; an arm driver to drive the arms; and a detector attached to the moving main body or the arms to inspect the second structure. The arms each can selectively take a pressed position and a detached position. When the moving body is moved, at least one of the arms are in the pressed position and pressed to the second structure, and the moving body is supported by the first and second structures.
    Type: Grant
    Filed: December 26, 2018
    Date of Patent: December 22, 2020
    Assignees: KABUSHIKI KAISHA TOSHIBA, Toshiba Energy Systems & Solutions Corporation
    Inventors: Manabu Watanabe, Akihiro Matsuzaki, Fumio Sato, Fujio Terai, Hitoshi Katayama, Yuichiro Gunji
  • Patent number: 10697458
    Abstract: A diagnostic system for a compressor is provided. The compressor includes a compression mechanism and a motor. The diagnostic system includes processing circuitry and memory and may be operable to differentiate between a low-side fault and a high-side fault by monitoring a rate of current rise drawn by the motor for a first predetermined time period following compressor startup. The diagnostic system may be operable to predict a severity level of a compressor condition based on a fault history stored in the memory.
    Type: Grant
    Filed: July 16, 2018
    Date of Patent: June 30, 2020
    Assignee: Emerson Climate Technologies, Inc.
    Inventors: Hung M. Pham, Nagaraj Jayanth
  • Patent number: 10626749
    Abstract: The present application provides a method of evaluating valve spindle vibration in a turbine by a data acquisition system. The method may include the steps of receiving a number of operating parameters from a number of sensors, wherein the operating parameters may include valve spindle vibration, comparing the valve spindle vibration to a predetermined value, and altering one or more of the operating parameters if the valve spindle vibration exceeds the predetermined value.
    Type: Grant
    Filed: August 31, 2016
    Date of Patent: April 21, 2020
    Assignee: General Electric Technology GmbH
    Inventor: Martin Reigl
  • Patent number: 10605845
    Abstract: A method for estimating an insulation resistance between a point of a high-voltage circuit including a high-voltage motor vehicle battery and a ground of the vehicle includes measuring a voltage value at terminals of a measurement circuit that includes a capacitive element connected to the battery and calculating a standard deviation value based on the measured voltage value and based on a theoretical voltage value estimated from a model of the measurement circuit. The model is a function of a capacitance value of the capacitive element. The method also includes calculating an averaged deviation value from the standard deviation value and previous deviation values and estimating an updated insulation resistance value in accordance with the averaged deviation value.
    Type: Grant
    Filed: December 2, 2014
    Date of Patent: March 31, 2020
    Assignee: RENAULT s.a.s.
    Inventors: Michel Mensler, Ludovic Merienne
  • Patent number: 10591548
    Abstract: A controller for driving a motor includes a multiphase driver, an analog-to-digital converter (ADC), impedance estimation circuitry, and fault detection circuitry. The multiphase driver is configured to generate drive signals for energizing each motor phase winding. The ADC is configured to digitize voltage and current from each motor phase winding. The impedance estimation circuitry is configured to determine a phasor value for the digitized voltages and for the digitized currents at a predetermined harmonic frequency, and to determine a sequence impedance value based on the phasor values. The fault detection circuitry is configured to identify a fault in the windings of the motor based on the sequence impedance value.
    Type: Grant
    Filed: October 8, 2018
    Date of Patent: March 17, 2020
    Inventors: Rajan Lakshmi Narasimha, David Patrick Magee
  • Patent number: 10498279
    Abstract: A electromagnetic machine system includes a rotor and a stator positioned about the rotor. A current injection mechanism is coupled with windings of the stator and structured to inject electrical currents therein so as to change a flux distribution of a magnetic field produced by the stator. The injected currents may be harmonic currents. The rotor further includes an inductor positioned to interact with the magnetic field when the flux distribution is changed, to produce an electrical excitation current for exciting windings in the rotor. The machine system may be a synchronous motor or generator, and may be brushless. Applications of the current injection strategy to direct torque control and vector control are also disclosed.
    Type: Grant
    Filed: November 23, 2015
    Date of Patent: December 3, 2019
    Assignee: ABB Schweiz AG
    Inventors: Wen Ouyang, Jun Li, Hongrae Kim
  • Patent number: 10461671
    Abstract: A multispeed alternating current (AC) machine circuit is for an AC power source having a first side and a second side. The AC machine circuit includes two or more pairs of power switches, one or more windings, and a control circuit to close one pair of power switches to cause current to flow from a first side of the AC power source, through the one or more windings, to the second side of the AC power source and to close the other pair of power switches to cause current to flow from the second side of the AC power source, through the one or more windings, to the first side of the AC power source.
    Type: Grant
    Filed: March 29, 2018
    Date of Patent: October 29, 2019
    Assignee: QM Power, Inc.
    Inventors: Charles J. Flynn, Cooper N. Tracy, W. Scott Hunter, Stephen B. Nichols
  • Patent number: 10454390
    Abstract: A system and method to detect an onset of motor rotation for an induction motor. The system and method involves monitoring a power supplied to a motor via a sensor, determining a power quantity based on the power monitored by the sensor, detecting an envelope of the power quantity, detecting an onset of rotation of the motor when an amplitude of the envelope has increased, and inhibiting power flow to the motor when the onset of rotation does not occur within a predetermined time period or logging a first time period of the detected onset of rotation of the motor for use in monitoring the condition of the motor. The power quantity can be a current vector magnitude or an instantaneous power corresponding to the supplied power.
    Type: Grant
    Filed: September 26, 2017
    Date of Patent: October 22, 2019
    Assignee: Schneider Electric USA, Inc.
    Inventor: Roy S. Colby
  • Patent number: 10443509
    Abstract: One embodiment includes a system including an actuation system of a gas turbine system including an actuator, a positioner including one or more sensors, a motor, and a controller communicably coupled to the positioner and the motor. The actuator is coupled to one or more inlet guide vanes (IGVs) or variable stator vanes (VSVs) and configured to move the IGVs or VSVs, the positioner is configured to position the actuator so that the actuator moves the IGVs or VSVs to a desired angle, the motor is configured to drive the actuator, and the controller is configured to establish one or more baselines for one or more types of data obtained by the sensors at initialization of the gas turbine system, derive a deviation from the baselines, and perform a preventative action if a deviation that meets or exceeds a threshold is derived.
    Type: Grant
    Filed: October 31, 2014
    Date of Patent: October 15, 2019
    Assignee: General Electric Company
    Inventors: Cyron Frank Kay, John Carver Maters
  • Patent number: 10403116
    Abstract: This disclosure relates to systems and methods for electrical signature analysis of electrical rotating machines. In one embodiment of the disclosure, a method includes ascertaining initial information associated with an electrical rotating machine, assigning a plurality of operational conditions associated with the machine to a plurality of buckets, and recording the electrical data to obtain a pre-defined number of sets of learning data. The method further includes determining, based at least on the initial information and the learning data, that the machine is in a healthy condition, obtaining, based on the learning data, baseline data associated with at the at least one bucket, and generating, based on the baseline data, a threshold associated with the bucket and at least one fault frequency associated with the machine. The method further includes generating, based on the threshold and the baseline data, alarms concerning a state of the electrical rotating machine.
    Type: Grant
    Filed: June 20, 2017
    Date of Patent: September 3, 2019
    Assignee: General Electric Company
    Inventors: Prabhakar Neti, Balakrishna Pamulaparthy, Sudhanshu Mishra, Balamourougan Vinayagam, Mitalkumar Kanabar, Vijayasarathi Muthukrishnan
  • Patent number: 10404197
    Abstract: Technical solutions are described for a motor control system that includes a feedforward control module to control an output torque generated by the motor. The feedforward controlling includes computing a first voltage command for the motor based on an input torque signal. Further, the feedforward controlling includes computing a second voltage command for the motor based on a brush drop voltage of the motor and a back-EMF drop voltage of the motor. Further, feedforward controlling includes computing a voltage command for the motor by summing the first voltage command and the second voltage command. Further yet, the feedforward controlling includes sending the voltage command to the motor for generating the output torque.
    Type: Grant
    Filed: September 26, 2017
    Date of Patent: September 3, 2019
    Assignee: Steering Solutions IP Holding Corporation
    Inventors: Perit Pramod, Rakesh Mitra
  • Patent number: 10371726
    Abstract: A shaft grounding and monitoring system may include a grounding member slidingly engageable with a rotating shaft. An electrical sensor may be configured to be coupled with the grounding member in order to detect an electrical parameter that provides an indication of electricity flowing from the rotating shaft to ground through the grounding member. A processor may be operably coupled with the electrical sensor and may receive and analyze data from the electrical sensor. The processor may be configured to periodically analyze the data representing the electrical parameter from the electrical sensor at a sampling rate and for a sampling period that is related to a rotation speed of the rotating shaft. A memory may be operably coupled with the processor and may be configured to store data processed by the processor that is representative of the data provided by the electrical sensor.
    Type: Grant
    Filed: January 10, 2017
    Date of Patent: August 6, 2019
    Assignee: CUTSFORTH, INC.
    Inventors: David A. Jahnke, Robert S. Cutsforth, Dustin L. Cutsforth
  • Patent number: 10359467
    Abstract: A method for detecting a short circuit (10) of a resolver exciter line (11, 12) comprising the steps of: measuring (31) the excitation voltage (U(ti) for the resolver (16) at a number of points in time during each excitation period; determining (32) the amplitude of the excitation voltage; starting a diagnostic mode (33) having the following steps (34 bis 37) if the amplitude of the excitation voltage does not reach a first threshold value; retrieving (34) the time-dependent voltage curves UH (ti) of the first and the second exciter line (H; 11) with respect to ground at the number of points in time; calculating (35) the amplitudes and the offset values of the time-dependent voltage curves; identifying (36) the exciter line that has a short circuit by determining that the calculated amplitudes do not exceed a second threshold value; identifying (37) the potential to which the short-circuited line (H or L) can be connected by comparing the offset values to third threshold values.
    Type: Grant
    Filed: June 7, 2016
    Date of Patent: July 23, 2019
    Assignee: Robert Bosch GmbH
    Inventors: Benjamin Lechner, Daniel Raichle, Daniel Zirkel, Michael Ungermann
  • Patent number: 10348236
    Abstract: A vehicle includes an electrically-driven motor configured to actuate a vehicle component and a power source configured to provide power to the motor over an electrical circuit. The vehicle also includes a controller programmed to monitor at least one signal indicative of motor output and store data indicative of a resistance in the circuit. The controller is also programmed to issue a resistance state of health signal in response to the resistance in the circuit exceeding a predetermined resistance threshold.
    Type: Grant
    Filed: October 25, 2016
    Date of Patent: July 9, 2019
    Assignee: GM Global Technology Operations LLC.
    Inventors: Wen-Chiao Lin, Xinyu Du, Youssef A. Ghoneim
  • Patent number: 10333291
    Abstract: Detection and protection against electric power generator stator ground fault conditions in multiple-generator high-impedance grounded installations is provided herein. In one embodiment, a generator protection element may block a determination of a fault using third harmonic voltages when the third harmonic voltage from the generator is less than a factor of the maximum third harmonic voltage from all of the generators on the common bus. A tripping subsystem may issue a trip command based upon detection of a stator ground fault condition.
    Type: Grant
    Filed: August 21, 2018
    Date of Patent: June 25, 2019
    Assignee: Schweitzer Engineering Laboratories, Inc.
    Inventors: Ritwik Chowdhury, Dale S. Finney
  • Patent number: 10281528
    Abstract: Systems, devices, methods, and techniques are disclosed for performing calibrated measurements of current through switches in an electronic control unit. In one example, a device includes a current sensor system; a controller, operably connected to the current sensor system; and one or more switches, operably connected to the controller. The current sensor system is configured to receive a measurement of current conducted through at least one switch of the one or more switches. The current sensor system is further configured to perform a measurement of calibrated total current for the one or more switches. The current sensor system is further configured to determine a calibrated value of current for the at least one switch, based at least in part on a comparison of the measurement of current conducted through the at least one switch and the measurement of calibrated total current for the one or more switches.
    Type: Grant
    Filed: January 4, 2016
    Date of Patent: May 7, 2019
    Assignee: Infineon Technologies AG
    Inventor: Robert J. Pizzuti
  • Patent number: 10197502
    Abstract: For detecting a crack formed on a structure surface without erroneously, an information processing device that detects a crack on a structure, includes a change detection unit that detects a change in positions of at least two measurement points on the structure; and a crack detection unit that detects a crack based on the change in the positions of the measurement points detected by the change detection unit.
    Type: Grant
    Filed: February 19, 2015
    Date of Patent: February 5, 2019
    Assignee: NEC Corporation
    Inventors: Masahiko Ohta, Jun Takada, Hiroshi Imai, Atsushi Hatabu, Gaku Nakano, Zhen Wang, Yuzo Senda
  • Patent number: 10175289
    Abstract: A water-tree resistance evaluation material including: a material selection selecting a candidate insulation material; a test carrying out a water tree test on a test piece having electrode holes formed on a first surface; and a candidate insulation material evaluation evaluating characteristics of the candidate insulation material, including progress and speed of a water tree. The test includes: a system and condition setting for setting a test system; a voltage application for grounding a ground-side electrode that is immersed in the ground-side aqueous solution, while applying an AC voltage to an application-side electrode that is immersed in the application-side aqueous solution; a measurement step; and a period determination for determining whether a test period has exceeded a predetermined period.
    Type: Grant
    Filed: September 20, 2013
    Date of Patent: January 8, 2019
    Inventors: Toshihiro Tsuda, Tetsuo Yoshimitsu, Yuichi Tsuboi, Yoshihiro Ishikawa, Teruo Kanekawa
  • Patent number: 10164563
    Abstract: An electric power system for supplying power to a permanent magnet electric machine includes a high-voltage DC power source that is disposed to supply electric power to a front-end converter connected via a high-voltage DC bus to an electric inverter that is connected to the electric machine. A method for operating a control system includes monitoring the electric machine. Upon detecting a fault associated with the electric machine, a controller commands operation of the front-end converter to generate a voltage level on the high-voltage DC bus that is a maximum setpoint voltage level and monitors back-emf voltage level from the electric machine. The inverter is controlled to a three-phase open state when the back-emf voltage level is less than the maximum setpoint voltage level. The inverter is controlled to a three-phase short state when the back-emf voltage level is greater than the maximum setpoint voltage level.
    Type: Grant
    Filed: April 15, 2016
    Date of Patent: December 25, 2018
    Assignee: GM Global Technology Operations LLC
    Inventors: Xin Jing, Brian A. Welchko, Constantin C. Stancu
  • Patent number: 9933487
    Abstract: A system and method for detecting, localizing and quantifying stator winding faults in AC electrical machines is disclosed. A diagnostic system configured to detect a stator winding fault in an AC electrical machine includes a processor programmed to receive measurements of three-phase voltages and currents provided to the AC electrical machine from voltage and current sensors associated with the electrical distribution circuit, compute positive, negative and zero sequence components of voltage and current from the three-phase voltages and currents, and calculate a fault severity index (FSI) based on at least a portion of the positive, negative and zero sequence components of voltage and current, wherein calculating the FSI further comprises identifying a voltage gain in one or more phases of the AC electrical machine due to a stator winding fault and localizing the stator winding fault to one or more phases in the AC electrical machine.
    Type: Grant
    Filed: March 31, 2014
    Date of Patent: April 3, 2018
    Assignee: Eaton Corporation
    Inventors: Santosh Kumar Sharma, Rahul Choudhary, Steven Andrew Dimino
  • Patent number: 9927826
    Abstract: An electric appliance monitor method and an monitor system are provided. The method includes the following steps. In a sampling period, data of an electric appliance is transmitted to a cloud server, and a load boundary is determined. The electric appliance is detected to obtain a measured power factor, a measured root-mean-square voltage and a measured power. Further, a supply frequency of an electric supply is recognized. Based on the measured data, a real part and an imaginary part of the load current related to a reflection coefficient of the electric appliance during the current usage state is calculated. On a real-imaginary current coordinate system, the load boundary and a coordinated point representing to the real part and imaginary part of the load current are displayed. Whether to execute a protection process is determined according to the load boundary, the real part and the imaginary part of the load current.
    Type: Grant
    Filed: June 23, 2015
    Date of Patent: March 27, 2018
    Inventor: Cheng-Tsuen Hsu
  • Patent number: 9853580
    Abstract: A method to reduce acoustic noise in a cooling fan motor is disclosed. The method includes reducing the slew rate of a PWM (pulse width modulation) voltage waveform applied to energize a coil of the fan motor. This slew rate reduction results in lower mechanical vibrations and acoustic noise in the fan motor. In one embodiment, the slew rate reduction is performed during startup of the fan motor, when the motor is spinning slowly and there is little air flow noise. In another embodiment, the slew rate reduction is not performed during high speed operation of the fan motor, when the fan motor is spinning very fast and air flow noise masks the motor noise. In one embodiment, there is variable slew rate control depending on the speed of the fan motor.
    Type: Grant
    Filed: March 11, 2014
    Date of Patent: December 26, 2017
    Assignee: Apple Inc.
    Inventors: Brad Lee Patton, Anthony Joseph Aiello, Jesse T. Dybenko
  • Patent number: 9825569
    Abstract: The present disclosure relates to a method of advanced motor control that reduces the resource demands (e.g., run-time) used to meet safety requirements by running a reduced portion of feedback control loop processes twice. In some embodiments, the method performs a plurality of processes within a feedback control loop of a motor control process configured to control operation of a motor. Performance of a first portion of the plurality of processes, which is less than the plurality of processes, is repeated within the feedback control loop. Performance of a second portion of the plurality of processes is not repeated within the feedback control loop. By repeating performance of first portion of the plurality of processes that is less than the plurality of processes, the method is able to improve performance of a motor by reducing run-time of the motor control process.
    Type: Grant
    Filed: May 8, 2014
    Date of Patent: November 21, 2017
    Assignee: Infineon Technologies AG
    Inventors: Hamzath Mohammed, Rafael Zalman, Tejaswini Basavarajaiah
  • Patent number: 9772357
    Abstract: A diagnostic apparatus that diagnoses a cutter tool or a rotating machine based on electric power supplied to the rotating machine, includes: an electric power measurement unit that measures the electric power; and a filtering unit that filters noises input from an input side and an output side of the electric power measurement unit, the electric power measurement unit including a Hall element, and applied voltage of an electric power supply line, that supplies the electric power to the rotating machine from an inverter or a servo amplifier, is input in the Hall element, wherein the electric power is calculated based on Hall voltage that is generated, when Hall current flows through the Hall element and magnetic flux is applied to a sensor surface of the Hall element, the Hall voltage being proportional to a product of the magnetic flux and the Hall current.
    Type: Grant
    Filed: January 25, 2017
    Date of Patent: September 26, 2017
    Assignee: FUJI ELECTRIC CO., LTD.
    Inventors: Yuji Matsuzoe, Tsuyoshi Inoue
  • Patent number: 9759774
    Abstract: An anomaly diagnosis system is provided that includes: a current-value obtaining part 111 that obtains a value of an AC current inputted to or outputted from a device to be diagnosed; a frequency analyzing part 112 that converts the current values obtained at intervals into a frequency spectrum which correlates a current intensity with a frequency; an anomaly-judging-value calculating part 113 that calculates at intervals a frequency width of the frequency spectrum at a current intensity “As” satisfying As=m×At (0<m<1), where “At” is a peak current intensity associated with an analysis frequency which is an integer multiple of a frequency of the AC current; and a judging part 114 that judges whether the frequency width is wider than that in a normal condition and, if it holds true, judges that the device is in an anomalous condition.
    Type: Grant
    Filed: February 11, 2016
    Date of Patent: September 12, 2017
    Assignee: Hitachi, Ltd.
    Inventors: Tetsuji Kato, Kohji Maki, Tomoaki Hiruta
  • Patent number: 9720045
    Abstract: Disclosed is an apparatus and method for estimating a SOC of a secondary battery containing a blended cathode material. The SOC estimating apparatus estimates a SOC of a secondary battery including a cathode having a blended cathode material containing a first cathode material and a second cathode material with different operating voltage ranges, an anode having an anode material, and a separator for separating the cathode from the anode, and the apparatus includes a sensor configured to measure a discharge inception voltage and a final discharge voltage when the secondary battery is discharged for a predetermined time, and a control unit configured to estimate SOC of the secondary battery corresponding to the measured discharge inception voltage and the measured final discharge voltage by using a predetermined relationship between the discharge inception voltage and the final discharge voltage and the SOC of the secondary battery.
    Type: Grant
    Filed: December 10, 2014
    Date of Patent: August 1, 2017
    Assignee: LG CHEM, LTD.
    Inventors: Won-Tae Joe, Sun-Young Cha, Geun-Chang Chung
  • Patent number: 9696946
    Abstract: An image forming apparatus, including a storage unit wirelessly accessible from an external device, switches its operation mode related to wireless access of the image forming apparatus between an active mode in which a signal for wirelessly connecting to an external device is transmitted and a passive mode enabling access to the storage unit in response to a signal for wireless connection from an external device.
    Type: Grant
    Filed: August 31, 2012
    Date of Patent: July 4, 2017
    Assignee: Canon Kabushiki Kaisha
    Inventor: Takehiro Ito
  • Patent number: 9685777
    Abstract: A leakage detection breaker includes a current transformer configured to detect a leakage current, and a leakage determination unit configured to determine DC and AC leakages based on an output signal from the current transformer. The leakage detection breaker further includes a power supply cut-off unit configured to cut off a supply of DC or AC power when the current leakage determination unit determines the occurrence of the DC or AC leakage.
    Type: Grant
    Filed: March 18, 2013
    Date of Patent: June 20, 2017
    Assignee: Panasonic Corporation
    Inventor: Kiyoshi Gotou
  • Patent number: 9656681
    Abstract: A circuit arrangement for revealing light signal errors, in particular for railway safety systems, includes an electronic signal generator, which can be disconnected in a reversible manner in the event of an error, and a control part, configured for incandescent lamps, for controlling and monitoring the signal generator. The device for revealing errors includes an error differentiator between the line-related interference voltage and error of the signal generator. The reliability of the error differentiation is improved and rendered independent of capacitive intermediate energy storage devices, in that the signal generator is connected to a resistance arrangement such that the signal generator voltage is greater, in high-resistance signal generators, than an interference voltage.
    Type: Grant
    Filed: November 14, 2013
    Date of Patent: May 23, 2017
    Assignee: Siemens Aktiengesellschaft
    Inventors: Rolf Eckl, Jr., Kay Koester
  • Patent number: 9618582
    Abstract: A system for detecting faults in a motor includes a drive circuit, a detection circuit, and a controller. The drive circuit is configured to apply a drive signal to a motor. The detection circuit is configured to detect a response signal generated when the drive signal is applied to the motor. The controller is configured to determine a motor fault based on a comparison of the response signal to an expected signal for the drive signal applied to the motor. The drive signal is selected to generate a rotating magnetic field in the motor with a rotation-frequency greater than a maximum mechanical-response-frequency of the motor.
    Type: Grant
    Filed: October 30, 2014
    Date of Patent: April 11, 2017
    Assignee: Delphi Technologies, Inc.
    Inventor: James E. Walters