公开(公告)号：US20180309378A1

公开(公告)日：2018-10-25

申请号：US15787006

申请日：2017-10-18

Applicant: KABUSHIKI KAISHA YASKAWA DENKI

Inventor： Toshihiro HANADA ,  Shinichi AKIMOTO ,  Hiroyuki IMAYOSHI ,  Keisei INOKI

IPC: H02M5/27 ,  H02P25/062

CPC classification number: H02M5/27 ,  H02M5/293 ,  H02P21/16 ,  H02P23/14 ,  H02P25/062

Abstract: A matrix converter includes a power converter circuit connectable on one side thereof with an alternating-current supply via a high- frequency filter and connectable on another side thereof with an alternating-current motor; a snubber circuit connected with a one-side line for connecting the high-frequency filter and the power converter circuit; a discharge switch discharging a charge accumulated in the snubber circuit depending on a voltage of the snubber circuit; and a control circuit configured to execute controlling the power converter circuit on the basis of a carrier frequency in test such that a test voltage is applied to the alternating-current motor, changing the carrier frequency in test on the basis of an operation state of the discharge switch, and determining constants of the alternating-current motor on the basis of a response state of the alternating-current motor at the time when the test voltage is applied.

公开(公告)号：US20240396478A1

公开(公告)日：2024-11-28

申请号：US18292108

申请日：2021-07-30

Applicant: KABUSHIKI KAISHA YASKAWA DENKI

Inventor： Shinichi AKIMOTO ,  Kazuhiko HIRAMATSU

IPC: H02P6/21 ,  H02K29/08 ,  H02P6/16

Abstract: A motor control device that can use a sensor input circuit that has a low response speed. The motor control device comprises a first magnetic pole position detection unit, a second magnetic pole position detection unit, and a control unit. The first magnetic pole position detection unit detects the pre-rotation position of a magnetic pole of a rotor based on detection results from a magnetic pole sensor. The second magnetic pole position detection unit detects the position of the magnetic pole of the rotor based on the current flowing in a plurality of drive windings that drive the rotor. The control unit performs control that makes the rotor start rotating based on detection results from the first magnetic pole position detection unit and control that makes the rotating rotor rotate based on detection results from the second magnetic pole position detection unit.

公开(公告)号：US20200044579A1

公开(公告)日：2020-02-06

申请号：US16528495

申请日：2019-07-31

Applicant: KABUSHIKI KAISHA YASKAWA DENKI

Inventor： Ryusuke KOMIYA ,  Shinichi AKIMOTO ,  Hiroyuki IMAYOSHI ,  Mitsunori SATO ,  Toshihiro HANADA

IPC: H02M7/48

Abstract: A power conversion device includes a power conversion circuitry configured to convert DC power into AC power by switching on/off a plurality of switching elements to switch each of a plurality of phase voltages to a voltage level selected from one of three levels including a first voltage, a second voltage higher than the first voltage, and a third voltage higher than the second voltage. A control circuitry is configured to control the plurality of switching elements so as to convert DC power into AC power without producing a combination of the first voltage and the third voltage between any two phases of the plurality of phase voltages.