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公开(公告)号：US20240339915A1
公开(公告)日：2024-10-10
申请号：US18294560
申请日：2022-07-28
发明人： Masakazu OKAYASU , Haiqing LI
IPC分类号： H02M1/00 , H02M7/5387
CPC分类号： H02M1/0012 , H02M1/0025 , H02M7/53873
摘要： A PI controller that calculates a PI control value for charge limitation, which is a PI control value for a deviation between a DC voltage applied to an inverter circuit and a charge limiter operating voltage when the DC voltage is higher than the charge limiter operating voltage, and calculates a PI control value for discharge limitation, which is a PI control value for a deviation between the DC voltage and a discharge limiter operating voltage when the DC voltage is lower than the discharge limiter operating voltage. A limiter regulator increases a limitation on a charging power command value from a host device by a command value limiter in accordance with the PI control value for charge limitation and increases a limitation on a discharging power command value from the host device by the command value limiter in accordance with the PI control value for discharge limitation.
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公开(公告)号：US20240332950A1
公开(公告)日：2024-10-03
申请号：US18290684
申请日：2022-03-18
发明人： Kenshi TAKAO , Shunsuke TOBAYASHI
CPC分类号： H02H7/08 , H02H1/0007
摘要： A motor control device includes a signal identifying unit and an overvoltage detecting unit. The signal identifying unit includes an optical isolator that converts an electrical signal supplied via a terminal to which an external device is connected and a switch that turns off a connection circuit connected to the terminal. The overvoltage detecting unit is configured to turn off the switch when a voltage applied to the connection circuit is greater than a threshold voltage.
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公开(公告)号：US20240297483A1
公开(公告)日：2024-09-05
申请号：US18578422
申请日：2022-05-31
发明人： Tsubasa SASAKI , Hidetaka ISHITOBI
IPC分类号： H02B1/20
CPC分类号： H02B1/20
摘要： A plurality of connection members extend in a first direction perpendicular to a vertical direction. A plurality of terminal members are attached to the plurality of connection members, respectively. Each of the plurality of terminal members includes a fixed portion and a connected portion. The fixed portion is attached to a connection member and extends in the first direction. The connected portion is joined to one end portion of the fixed portion in a longitudinal direction, and an electric wire is connected to the connected portion. The connected portion extends in a direction orthogonal to the direction in which the fixed portion extends. Each of the plurality of terminal members is attached to the connection member in any of a first attitude in which the connected portion extends upward in the vertical direction and a second attitude in which the connected portion extends downward in the vertical direction.
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公开(公告)号：US20240286141A1
公开(公告)日：2024-08-29
申请号：US18569605
申请日：2022-03-30
发明人： Shuzo IKEDA
CPC分类号： B02C17/1805 , B02C25/00 , G01L5/0071 , G01N33/24
摘要： A detection device according to an embodiment detects a presence or absence of a processing material adhered to an interior wall of a drum of a mill pulverizing a mineral. The detection device is configured to store an initial torque detected at a preset initial rotation angle, calculate a maximum torque based on the initial torque, the initial rotation angle, and a rotation angle greater than the initial rotation angle, calculate a ratio of a torque at the rotation angle divided by the maximum torque, compare the ratio and a preset threshold, and determine that the processing material is adhered to the interior wall of the drum when the ratio is equal to the threshold or greater than the threshold.
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公开(公告)号：US20240258906A1
公开(公告)日：2024-08-01
申请号：US18007214
申请日：2021-01-08
发明人： Naoto NIIMURA
CPC分类号： H02M1/14 , H02M1/0009 , H02M5/458
摘要： According to an embodiment, a power conversion system includes a plurality of converters and a control unit. The plurality of converters are provided in parallel for each phase of a multi-phase alternating current power system. The control unit uses a plurality of carrier signals having a prescribed phase difference from each other in carrier comparison type pulse width modulation (PWM) control. The control unit detects a current of a primary side of the plurality of converters at each of four or more even-numbered timings when the four or more even-numbered timings are defined at prescribed time intervals during one cycle of a specific carrier signal among the plurality of carrier signals. The control unit generates a reference voltage for the PWM control using a value of the detected current of the primary side and a value of a reference current of the primary side and updates the reference voltage at each of the four or more even-numbered timings. The control unit controls a specific converter among the plurality of converters using the specific carrier signal and the updated reference voltage.
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公开(公告)号：US20240251514A1
公开(公告)日：2024-07-25
申请号：US18576710
申请日：2022-05-24
发明人： Koki NAKAMURA
CPC分类号： H05K5/0221 , H05K7/183 , H05K7/1425
摘要： A rack includes first to fourth column members and first and second guide members. A case of an electric device has first and second side surfaces in a width direction that are supported by the first and second guide members, respectively. First and second restriction members are attached to inner surfaces of the first and second side surfaces of the case, respectively, for restricting the case from moving in a front direction of the rack. Second restriction member is attached to face the first restriction member in the width direction. In a state where the electric device is housed within the rack, the first restriction member is located between the first and third column members in a front-back direction. The second restriction member is located between the second and fourth column members in the front-back direction.
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公开(公告)号：US20240120865A1
公开(公告)日：2024-04-11
申请号：US18259427
申请日：2021-10-29
发明人： Takumi ITO
CPC分类号： H02P21/18 , H02P21/0003 , H02P21/34 , H02P27/06 , H02P2207/05
摘要： A drive system according to an aspect of the embodiment includes a first phase estimation unit, a second phase estimation unit, a state determination unit, and a drive control unit. The first phase estimation unit generates a first phase obtained by estimating a phase of a rotor on the basis of an initial phase at a startup stage of the synchronous motor. The second phase estimation unit generates a second phase obtained by estimating the phase of the rotating rotor on the basis of the operation state of the synchronous motor. The state determination unit determines the operation state of the synchronous motor. The drive control unit controls the driving of the synchronous motor by using any one of the first phase and the second phase according to the determination result of the operation state of the synchronous motor. The first phase estimation unit corrects the first phase by using the detection result of the rotor position detected from the start of the startup procedure of the synchronous motor to the successful startup.
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公开(公告)号：US11942876B2
公开(公告)日：2024-03-26
申请号：US17754550
申请日：2019-12-20
发明人： Kazuki Aoyagi , Yoshihiro Tawada
CPC分类号： H02M7/539 , H02M1/0025 , H02M7/48
摘要： A power conversion device includes: a power conversion circuit connected to a direct-current power supply and a power system and configured to perform conversion between direct-current power and alternating-current power; a phase-locked loop circuit configured to output a phase instruction value based on a system alternating-current voltage phase of the power system; and a control circuit configured to control the power conversion circuit based on the phase instruction value from the phase-locked loop circuit. The phase-locked loop circuit includes: a phase difference calculation section configured to calculate a phase difference in a predetermined cycle, the phase difference representing a deviation of the phase instruction value from the system alternating-current voltage phase of the power system; a phase difference correction section; and a phase instruction value generation section configured to output the phase instruction value based on an output of the phase difference correction section.
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公开(公告)号：US11942874B2
公开(公告)日：2024-03-26
申请号：US17754651
申请日：2020-02-03
发明人： Issei Fukasawa , Masahiro Kinoshita , Kenta Yamabe
摘要： A control system of a power converter includes a plurality of carrier wave generating units which are respectively provided for a plurality of power converters connected between a plurality of DC power supplies and a common AC power supply and which are configured to respectively generate carrier waves on the basis of an AC voltage of the AC power supply. The control system of the power converter can thereby synchronize carrier phases of a plurality of power converters.
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公开(公告)号：US11929689B2
公开(公告)日：2024-03-12
申请号：US17631722
申请日：2019-09-13
发明人： Ryoji Tsuruta , Hiroshi Masunaga , Tomohiro Tanaka
IPC分类号： H02M7/538 , H02M1/00 , H02M1/08 , H02M1/38 , H02M7/5387
CPC分类号： H02M7/53871 , H02M1/0009 , H02M1/08 , H02M1/38
摘要： A power conversion device includes: a dead time application unit which applies a dead time to only one of a pair of pulse signals; a current polarity detection unit which detects a polarity of an output current; and a gate signal selection unit which, if the polarity of the output current is positive, selects the one pulse signal, to which the dead time has been applied, as a gate signal for a positive arm and selects the other pulse signal as a gate signal for a negative arm, and, if the polarity of the output current is negative, selects the one pulse signal, to which the dead time has been applied, as the gate signal for the negative arm and selects the other pulse signal as the gate signal for the positive arm.
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