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公开(公告)号：US20170214343A1
公开(公告)日：2017-07-27
申请号：US15328149
申请日：2015-08-28
Inventor： DAISUKE SONODA , MITSUHIRO SAKAMOTO , TORU TAZAWA
Abstract: Provided is a motor drive device which performs switching, with respect to a synchronous motor including a stator around which a motor winding is wound and a rotor holding a permanent magnet, from a synchronous operation in which the synchronous motor is synchronously driven to position-sensorless vector control in which a current supplied to the motor winding is controlled based on a position of the rotor. During the synchronous operation, the present motor drive device calculates, by estimation, an induced voltage error based on the detected current and voltage, performs control of an amplitude of a current instruction such that an error, of a target induced voltage, calculated based on an estimated induced voltage and based on an internal angle becomes equal to the induced voltage error, and switches the mode to the sensorless mode after the error is reduced to be within a range of a predetermined value. Further, by gradually reducing the current instruction during the synchronous operation, the absolute value of the induced voltage error is reduced to be within a range of the predetermined value.
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公开(公告)号：US20220368559A1
公开(公告)日：2022-11-17
申请号：US17757154
申请日：2020-12-10
Inventor： MASASHI MISHIMA , DAISUKE SONODA
IPC: H04L12/403
Abstract: A communication device includes a processing part and a communication part that communicates with one or more slaves. The processing part has a function of executing communication processing and setting processing. The communication processing is processing for transmitting a main frame including main data from the communication part to one or more slaves in a first period. The setting processing is processing for setting a second period shorter than the first period and a time slot allocated to at least one slave among the one or more slaves in every second period.
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公开(公告)号：US20230280718A1
公开(公告)日：2023-09-07
申请号：US18004328
申请日：2021-06-17
Inventor： MASASHI MISHIMA , DAISUKE SONODA , YOSHIAKI IKEUCHI
IPC: G05B19/414
CPC classification number: G05B19/4141 , G05B2219/2231
Abstract: A communication device includes a processor and a communication part. The communication part communicates with one or more slaves. The processor has a function of executing communication processing and setting processing. The communication processing includes causing the communication part to transmit a frame including main data to the one or more slaves in a first period. The setting processing includes setting N (N is an integer of 2 or more) second periods within the first period. The setting processing includes setting a slot for performing communication of sub-data other than the main data for each of the second periods. The frame includes at least one of the slots during a transmission period of the main data.
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4.发明申请公开(公告)号：US20170163194A1
公开(公告)日：2017-06-08
申请号：US15325309
申请日：2016-01-26
Inventor： MITSUHIRO SAKAMOTO , YASUYUKI YOKOUCHI , DAISUKE SONODA , RYUTA SASAKI
CPC classification number: H02P21/0025 , H02P6/08 , H02P21/00 , H02P21/20 , H02P23/0031 , H02P27/06 , H02P2205/05
Abstract: A motor control device at least includes a speed control part for controlling a motor rotation speed. The motor control device includes a torque correction means for suppressing variation in torque constant due to individual differences of motors. In addition, the motor control device corrects the torque constant by using a correction torque coefficient calculated based on an unloaded speed when a fixed voltage is applied. Alternatively, the torque constant is corrected using the correction torque coefficient calculated based on the motor applied voltage when the motor speed is fixed.
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