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公开(公告)号：US11870384B2
公开(公告)日：2024-01-09
申请号：US16644207
申请日：2018-06-13
发明人： Hiroshi Watanabe , Masataka Sasaki , Masahiro Hiraga , Yusuke Arao , Atsuhiko Nakamura , Hiroyuki Tomita , Kazushige Hotta , Yusaku Onuma
CPC分类号： H02P6/17
摘要： The purpose of the present invention is to provide a speed detection method for maintaining a fine time axis resolution and a power conversion device that uses the method. This power conversion device comprises an inverter for converting DC voltage into AC voltage and supplying the same to a motor, a motor speed calculation unit for calculating the speed of the motor from output pulses obtained from an encoder connected to the motor, and a control unit for receiving the motor speed from the motor speed calculation unit and controlling the inverter. In the power conversion device, the motor speed calculation unit measures the duty cycle of the output pulses, calculates the speed using the half cycles of the output pulses if the duty cycle is within a prescribed range from 50%, and calculates the speed using the full cycles of the output pulses if the duty ratio is outside of the prescribed range from 50%.
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公开(公告)号：US11340310B2
公开(公告)日：2022-05-24
申请号：US16956830
申请日：2018-01-12
发明人： Kazushige Hotta , Keisuke Tanabe , Yusuke Arao
摘要： This voltage imbalance assessment method is for a power conversion device comprising a forward converter for rectifying the voltage of a three-phase AC power supply, a smoothing capacitor for smoothing the rectified voltage, a detection unit for detecting the smoothed voltage, and a control unit. The control unit: uses the detected voltage to generate data indicating frequency components; compares, in the data indicating frequency components, the magnitude of the component that is four times the power supply frequency with the magnitude of the component that is six times the power supply frequency; and assesses the voltage imbalance of the three-phase AC power supply on the basis of the comparison.
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公开(公告)号：US11451182B2
公开(公告)日：2022-09-20
申请号：US16644400
申请日：2017-12-07
发明人： Yusuke Arao
摘要： A power conversion device includes an AC conversion unit; a detector that detects an output current, a DC voltage, and a temperature; an I/O unit; and a control unit. The control unit includes a motor control unit that controls the AC conversion unit; an operation instruction/parameter setting unit that converts an operation instruction and a parameter; an information management unit; an I/O control unit; and a detection unit that acquires data of the detector. The operation instruction/parameter setting unit outputs the set parameter and characteristic data to the information management unit, which acquires parameter information associated with the operation instruction and parameter information for an operation instruction change quantity required for adjustment from an information server. The operation instruction/parameter setting unit converts the operation instruction into a parameter using the data acquired by the detection unit and the parameter information and sets the parameter in the motor control unit.
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公开(公告)号：US10903759B2
公开(公告)日：2021-01-26
申请号：US16323683
申请日：2016-12-26
发明人： Yusuke Arao , Kazushige Hotta
IPC分类号： G01R19/165 , H02M7/5387 , H02H7/122 , H02M1/32 , H02M1/00 , H02M5/458
摘要： Provided is a power conversion device with which it is possible to acquire a sign of a system stop before the system stops, and to minimize the nonworking time of the system. A power conversion device for converting DC voltage or AC voltage into AC voltage, the power conversion device being characterized by having an abnormality detection unit for detecting abnormalities in the power conversion device, a restart unit for stopping the power conversion device and automatically performing a restart when the abnormality detection unit has detected an abnormality, a restart recording unit for recording restart information of when the restart unit has restarted, and a sign diagnostic unit for inputting the restart information recorded by the restart recording unit and performing a sign diagnosis of the abnormality in the power conversion device on the basis of the restart information, the sign diagnostic unit performing the sign diagnosis on the basis of the number of restarts and outputting a sign diagnostic result.
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公开(公告)号：US11442415B2
公开(公告)日：2022-09-13
申请号：US17046758
申请日：2018-12-14
发明人： Takaaki Hayashi , Yusuke Arao
IPC分类号： H02P29/024 , G05B9/02 , H02M7/5395
摘要： A power conversion device includes a function of improving safety of a system by making a dynamical setting for a safety function operation at a time of detecting an abnormality in a system operation or a diagnosis error in accordance with a condition of the system at a time of the abnormality. A power conversion system includes a power conversion device main body configured to drive a motor and a safety function unit configured to execute a safety function. The safety function unit outputs a safety function operation instruction signal when receiving a safety request signal, and the power conversion device main body controls the motor by the safety function operation instruction signal. The safety function unit monitors a state of the motor, and, in a case where the state of the motor exceeds a predetermined range, executes a threshold-value-excess post-process by a safety function operation selected in advance.
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公开(公告)号：US11050360B2
公开(公告)日：2021-06-29
申请号：US16640828
申请日：2017-09-06
发明人： Yusuke Arao
摘要： Disclosed is a power conversion device having an AC conversion unit and a control unit that controls the AC conversion unit. The power conversion device also has: a temperature detection unit that outputs temperature data of the power conversion device; a current detection unit that outputs current data of an output of the AC conversion unit; a storage unit that stores specification data indicating a relationship between a rated current and a temperature specification and temperature data output by the detection unit; an overload protection unit that outputs a shutdown command to the control unit on the basis of the rated current and the current data output by the current detection unit; and a rating determination unit that acquires specification data and temperature data from the storage unit, determines a rated current corresponding to the acquired temperature data on the basis of the acquired specification data, and outputs the determined rated current to the overload protection unit.
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