公开(公告)号：US20240255030A1

公开(公告)日：2024-08-01

申请号：US18564433

申请日：2022-05-24

Applicant: NSK LTD.

Inventor： Taisuke MARUYAMA ,  Faidhi RADZI

IPC: F16C41/00 ,  G01M13/04 ,  G01R25/00 ,  G06F17/11

CPC classification number: F16C41/00 ,  G01M13/04 ,  G01R25/00 ,  G06F17/11 ,  F16C2233/00

Abstract: A detection method for detecting a state of a bearing device including a plurality of rollers and first and second members configuring rolling surfaces of the rollers, the method including: applying an AC voltage to an electrical circuit configured by the rollers and the first and second members; measuring an impedance and a phase angle of the electrical circuit when applying the AC voltage; and deriving, based on the impedance and the phase angle, an oil film thickness and a metal contact ratio in at least one of between the first member and the rollers and between the second member and the rollers, in which the oil film thickness and the metal contact ratio are derived using a calculation equation corresponding to an electrical circuit configured by a line contact occurring between a roller and at least one of the first and second members in the bearing device.

公开(公告)号：US11971437B2

公开(公告)日：2024-04-30

申请号：US17611843

申请日：2020-05-25

Applicant: HYOSUNG HEAVY INDUSTRIES CORPORATION

Inventor： Hyun Jun Kim ,  Hae Won Seo ,  Byung Hwan Jeong

IPC: G01R25/00 ,  H02J3/40 ,  H03L7/085

CPC classification number: G01R25/00 ,  H02J3/40 ,  H03L7/085

Abstract: A grid voltage phase detector includes: a d-q transformation unit for receiving a three-phase signal and producing a signal on d axis and a signal on q axis; a phase signal producing unit for producing a signal for phase synchronization of grid voltage from the signal on d axis and the signal on q axis; and a PR filtering unit, with a first filter having no change in magnitude and phase at a rated frequency, a second filter introducing 90° phase lead at a rated frequency, a third filter introducing 90° phase lag, and a fourth filter having no change in magnitude and phase at a rated frequency, for removing unbalanced components and harmonic components from the signal on d axis and the signal on q axis produced by the d-q transformation unit and providing the signals to the phase signal producing unit.

公开(公告)号：US20240072692A1

公开(公告)日：2024-02-29

申请号：US17978951

申请日：2022-11-01

Applicant: ANPEC ELECTRONICS CORPORATION

Inventor： KUN-MIN CHEN

IPC: H02P6/16 ,  G01B7/30 ,  G01D5/14 ,  G01R25/00

CPC classification number: H02P6/16 ,  G01B7/30 ,  G01D5/145 ,  G01R25/00

Abstract: A motor driver using a correcting mechanism on a sensed motor position is provided. A rotor position detector circuit senses a position of a rotor of a motor to output a commutation signal. A back electromotive force detector circuit detects a back electromotive force signal of the motor. An actual phase difference calculator circuit calculates a phase difference between the back electromotive force signal and the commutation signal as an actual phase difference. An error phase angle calculator circuit calculates a difference between the actual phase difference and a reference phase difference as an error phase angle. A motor driving circuit corrects the commutation signal according to the error phase angle. The motor driving circuit determines the position of the rotor of the motor to drive the motor according to the corrected commutation signal.

公开(公告)号：US11906557B2

公开(公告)日：2024-02-20

申请号：US17645654

申请日：2021-12-22

Applicant: Schweitzer Engineering Laboratories, Inc.

Inventor： Veselin Skendzic ,  Daniel P. Dwyer ,  Chandrasekaran Swaminathan

IPC: G01R23/02 ,  G06F1/03 ,  G01R19/00 ,  G01R25/00

CPC classification number: G01R23/02 ,  G01R19/0015 ,  G01R25/00 ,  G06F1/03

Abstract: A method includes obtaining electrical measurements of an input signal of a power system. The electrical measurements are obtained at a sampling frequency and the input signal is indicative of an operating frequency of the power system. The method includes generating an intermediate signal from the input signal. The intermediate signal has a direct current (DC) component indicative of a magnitude and a phase of the input signal. The method includes filtering the intermediate signal using an adjustable length filter to obtain the magnitude and the phase of the input signal. The length of the adjustable length filter varies based at least in part on a period measurement of the power system.

公开(公告)号：US11906552B1

公开(公告)日：2024-02-20

申请号：US18228302

申请日：2023-07-31

Applicant: DIGITAL GRID RES. INST, CHINA SOUTHERN POWER GRID

Inventor： Peng Li ,  Bing Tian ,  Zhong Liu ,  Bofeng Luo ,  Zhiming Wang ,  Licheng Li ,  Xiaopeng Fan ,  Senjing Yao ,  Qiancheng Lv ,  Zhenheng Xu ,  Renze Chen ,  Yuehuan Lin ,  Xu Yin ,  Jiaming Zhang ,  Jie Wei ,  Zejie Tan

IPC: G01R15/06 ,  G01R19/00 ,  G01R25/00

CPC classification number: G01R15/06 ,  G01R19/0084 ,  G01R25/00

Abstract: The present disclosure relates to a voltage measuring method, a computer device and a storage medium. The method includes: determining, by a voltage measuring device when the voltage measuring device is electrically coupled to a three-phase conductor through a voltage dividing capacitor in the voltage measuring device, a current measured voltage, the measured voltage being determined by measuring a voltage of the voltage dividing capacitor in the voltage measuring device; adjusting the coupling capacitances, and determining, by the voltage measuring device after the adjustment of the coupling capacitances, a current measured voltage; and determining, based on the measured voltage by the voltage measuring device before the adjustment of the coupling capacitances and the measured voltage by the voltage measuring device after the adjustment of the coupling capacitances, a voltage of a phase conductor of the three-phase conductor to be measured.

公开(公告)号：US11754741B2

公开(公告)日：2023-09-12

申请号：US17555240

申请日：2021-12-17

Applicant: Halliburton Energy Services, Inc.

Inventor： Baris Guner ,  Luis Emilio San Martin

IPC: G01V3/38 ,  G01V3/20 ,  G01V1/16 ,  E21B47/00 ,  E21B49/00 ,  G01V3/00 ,  G01R27/00 ,  G01V3/24 ,  G01R25/00 ,  E21B47/002

CPC classification number: G01V3/38 ,  E21B47/0025 ,  G01V3/20 ,  E21B47/00 ,  E21B49/00 ,  G01R25/00 ,  G01R27/00 ,  G01V1/16 ,  G01V3/00 ,  G01V3/24

Abstract: A method and system for resistivity imaging. A method may comprise disposing a downhole tool into a borehole, applying a voltage difference between the array of injector electrodes, constructing a first set of formation images for each of the plurality of frequencies, applying a mud effect removal algorithm to produce a second set of formation images for each of the plurality of frequencies, applying a dielectric correction algorithm to each of the plurality of frequencies to produce a third set of formation images for each of the plurality of frequencies, and combining the first set of formation images, the second set of formation images, and the third set of formation images to obtain a blended image. A system for resistivity imaging may comprise a downhole tool. The downhole tool may comprises a pad, an array of injector electrodes, and one or more return electrodes.

公开(公告)号：US20230280383A1

公开(公告)日：2023-09-07

申请号：US18195906

申请日：2023-05-10

Applicant: Aclara Technologies LLC

Inventor： David Rieken ,  Roger Smith

IPC: G01R25/00 ,  G01R21/133 ,  H04B3/54

CPC classification number: G01R25/00 ,  G01R21/133 ,  H04B3/54 ,  H04W84/18

Abstract: A system for determining a phase of a power supply coupled to a metering device. The system includes a collection device in electronic communication with a metering device connected to a power distribution network and having a memory and one or more electronic processors. The electronic processors are configured to receive a first beacon signal and measure a phasor in response to receiving the first beacon signal. The phasor is stored in the memory along with an identification value associated with the device that transmitted the first beacon signal and a first time. The electronic processors receive a second beacon signal, and extract data from the request message. The electronic processors determine whether the extracted time matches the first time and based on determining that the extracted time matches the first time stored in the memory, calculate a phase by comparing the reference phasor data to the stored phasor.

公开(公告)号：US20190204369A1

公开(公告)日：2019-07-04

申请号：US16159875

申请日：2018-10-15

Applicant: Nucleus Scientific, Inc.

Inventor： Serge R. Lafontaine ,  Ian W. Hunter

IPC: G01R23/02 ,  H02J50/12 ,  H02J50/60 ,  H02J50/80 ,  G01R31/00 ,  G01R19/25 ,  H02J50/10 ,  G01R25/00 ,  H02J50/90 ,  H02J7/00 ,  H02J7/02 ,  H02J5/00

CPC classification number: G01R23/02 ,  G01R19/2509 ,  G01R25/00 ,  G01R31/001 ,  G06F17/50 ,  G06K9/469 ,  H02J5/005 ,  H02J7/007 ,  H02J7/025 ,  H02J50/10 ,  H02J50/12 ,  H02J50/60 ,  H02J50/80 ,  H02J50/90 ,  Y02P90/265

Abstract: A method of detecting whether a receiver coil is near a transmit coil in a wireless power transfer system (WPTS), the method involving: applying a pseudo-random signal to the transmit coil; while the pseudo-random signal is being applied to the transmit coil, recording one or more signals produced within the WPTS in response to the applied pseudo-random signal; by using the one or more recorded signals, generating a dynamic system model for some aspect of the WPTS; and using the generated dynamic system model in combination with stored training data to determine whether an object having characteristics distinguishing the object as a receiver coil is near the transmit coil.

公开(公告)号：US20190131962A1

公开(公告)日：2019-05-02

申请号：US16149687

申请日：2018-10-02

Applicant: SK hynix Inc. ,  Seoul National University R&DB Foundation

Inventor： Deog-Kyoon JEONG ,  Suhwan KIM ,  Joo-Hyung CHAE

IPC: H03K5/26 ,  H03K3/03 ,  H03K17/687 ,  H03H7/06 ,  G01R25/00

CPC classification number: H03K5/26 ,  G01R25/00 ,  H03H7/06 ,  H03K3/0315 ,  H03K17/687

Abstract: A duty cycle detector includes a first ring oscillator suitable for including an odd number of first inverters and generating a first periodic signal by using the first inverters, at least one inverter among the first inverters being enabled during a time interval when a clock has a first value, a second ring oscillator including an odd number of second inverters and suitable for generating a second periodic signal using the second inverters, at least one inverter among the second inverters being enabled during a time interval when the clock has a second value. The duty cycle detector further includes a frequency comparator suitable for comparing a frequency of the first periodic signal with a frequency of the second periodic signal and generating a duty cycle detection signal of the clock.

公开(公告)号：US20180279437A1

公开(公告)日：2018-09-27

申请号：US15547451

申请日：2017-01-16

Applicant: EcoSense Lighting Inc.

Inventor： Mustafa Homsi

IPC: H05B33/08 ,  G01R25/00 ,  G01R19/04 ,  G01R19/00

CPC classification number: H05B33/0851 ,  G01R19/003 ,  G01R19/04 ,  G01R25/00 ,  G02F1/01 ,  H03L7/08 ,  H05B33/0809 ,  H05B37/02 ,  H05B39/044

Abstract: System for determining periodic values of phase angle Φ of waveform power input including voltage detector for detecting periodic values of average voltage of waveform power input and detecting corresponding periodic values of peak voltage of waveform power input. System also includes phase angle Φ detector in signal communication for receiving periodic values of average voltage and peak voltage from voltage detector. Phase angle Φ detector also detects periodic values each being ratio of one of periodic values of average voltage divided by corresponding periodic value of peak voltage, or being ratio of peak voltage divided by average voltage; and determines periodic values of phase angle Φ of waveform power input corresponding to periodic values of ratio. Lighting systems.