US 12,113,450 B2
Power conversion device
Keisei Inoki, Fukuoka (JP); Takahiro Saeki, Fukuoka (JP); Toshihiro Hanada, Fukuoka (JP); Kengo Nakahara, Fukuoka (JP); and Hideaki Iura, Fukuoka (JP)
Filed by KABUSHIKI KAISHA YASKAWA DENKI, Kitakyushu (JP)
Filed on Feb. 24, 2022, as Appl. No. 17/679,084.
Claims priority of application No. 2021-030229 (JP), filed on Feb. 26, 2021.
Prior Publication US 2022/0278626 A1, Sep. 1, 2022
Int. Cl. H02M 5/458 (2006.01); H02P 1/26 (2006.01); H02P 21/22 (2016.01); H02P 27/04 (2016.01); H02P 29/028 (2016.01)
CPC H02M 5/458 (2013.01) [H02P 1/26 (2013.01); H02P 21/22 (2016.02); H02P 27/04 (2013.01); H02P 29/028 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A power conversion device comprising:
power conversion circuitry configured to perform a power conversion for outputting a driving power to an induction motor;
a communication interface configured to receive one or more signals from a master power conversion device; and
control circuitry configured to:
receive a master command phase from the communication interface based, at least in part, on the one or more signals from the master power conversion device;
generate a voltage command having a command phase in a rotating coordinate system based on a torque target value, wherein a rotating magnetic field for driving a rotor of the induction motor is generated to rotate with the rotating coordinate system;
calculate a rotation phase of the rotating coordinate system based on a command phase difference between the master command phase and the command phase to reduce the command phase difference; and
control the power conversion circuitry to output the driving power to the induction motor, based on the rotation phase and the voltage command, so that the rotating magnetic field is in synchronization with a master rotating magnetic field generated by the master power conversion device.