公开(公告)号：US20220006403A1

公开(公告)日：2022-01-06

申请号：US17290721

申请日：2019-10-16

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： RYUTA SASAKI ,  TORU TAZAWA

IPC: H02P21/00 ,  H02P21/20 ,  H02P21/18

Abstract: A motor control device controls a current of a motor based on a torque command, the current being separated into a d-axis current and a q-axis current orthogonal to the d-axis current, the torque command being a target value of a torque of the motor. The motor control device includes a current vector controller that receives input of a d-axis current command and a q-axis current command, and generates a d-axis voltage command and a q-axis voltage command, a difference between a value of the d-axis current and a value of the d-axis current command being zero, a difference between a value of the q-axis current and a value of the q-axis current command being zero, a q-axis current command generator that generates the q-axis current command based on the torque command, a magnetic-flux weakening controller that generates the d-axis current command based on a difference between a voltage command and a reference voltage, the voltage command being a vector with the d-axis voltage command output from the current vector controller as a d-axis component and the q-axis voltage command as a q-axis component, an amplitude of the voltage command not exceeding the reference voltage, a current limiter that limits a magnitude of the d-axis current command according to a magnitude of the q-axis current command, the d-axis current command being a d-axis component of a current command vector of the motor, the q-axis current command being a q-axis component of the current command vector of the motor, a magnitude of the current command vector of the motor not exceeding a current limit value, and a reference voltage correction unit that corrects the reference voltage based on a difference between a value of the d-axis current command before limitation and a value of the d-axis current command after the limitation.

公开(公告)号：US20170163194A1

公开(公告)日：2017-06-08

申请号：US15325309

申请日：2016-01-26

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： MITSUHIRO SAKAMOTO ,  YASUYUKI YOKOUCHI ,  DAISUKE SONODA ,  RYUTA SASAKI

IPC: H02P21/00 ,  H02P6/08 ,  H02P27/06

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.

公开(公告)号：US20230409002A1

公开(公告)日：2023-12-21

申请号：US18250224

申请日：2021-11-24

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： RYUTA SASAKI ,  SUSUMU EMI

IPC: G05B19/40

CPC classification number: G05B19/40 ,  G05B2219/35108

Abstract: Provided is cam curve generating device that generates a cam curve that is smoothly connected to an out-section cam curve and reduces fluctuations in speed of a driven shaft and acceleration of the driven shaft. Cam curve generating device includes section divider that divides an application section into a plurality of sub-sections, and cam curve generator that generates a cam curve in the application section. The division condition includes a length and the type of each of the plurality of sub-sections. The boundary condition includes a position, speed, and acceleration of the driven shaft at each of a start and an end of the application section. Cam curve generator generates a cam curve that allows a position of the driven shaft, speed of the driven shaft, and acceleration of the driven shaft to be continuous at each of boundaries of the plurality of sub-sections.