公开(公告)号：US09647597B2

公开(公告)日：2017-05-09

申请号：US14521619

申请日：2014-10-23

Applicant: KABUSHIKI KAISHA YASKAWA DENKI

Inventor： Shuji Matsuda ,  Hideaki Iura

IPC: H02P23/00 ,  H02J3/18 ,  H02P27/06 ,  H02P1/02 ,  H02P23/28

CPC classification number: H02P27/06 ,  H02P1/029 ,  H02P23/28

Abstract: A motor control apparatus includes a voltage regulator to execute a voltage increase mode to increase a voltage applied to an induction motor from a lower limit of a first range over time. A frequency regulator executes a frequency decrease mode to decrease a frequency of the voltage from an upper limit of a second range over time. The frequency regulator limits decrease of the frequency when a bus voltage of a bus exceeds a first threshold in the frequency decrease mode. The bus supplies DC power to an inverter to drive the motor. A mode changer alternatively changes the voltage increase mode and the frequency decrease mode to control the motor to change from a free running state to a state in which the voltage and the frequency satisfy a relationship. The determinator determines whether the voltage and the frequency satisfy the relationship.

公开(公告)号：US09641120B2

公开(公告)日：2017-05-02

申请号：US14520393

申请日：2014-10-22

Applicant: KABUSHIKI KAISHA YASKAWA DENKI

Inventor： Shuji Matsuda ,  Hideaki Iura

IPC: H02P23/00 ,  H02J3/18 ,  H02P27/06 ,  H02P1/02 ,  H02P1/28 ,  H02P1/30 ,  H02P23/28

CPC classification number: H02P27/06 ,  H02P1/029 ,  H02P1/28 ,  H02P1/30 ,  H02P23/28

Abstract: A motor control apparatus includes a voltage regulator to execute a voltage increase mode to increase a voltage applied to an induction motor from a lower limit of a first range over time. A frequency regulator executes a frequency decrease mode to decrease a frequency of the voltage from an upper limit of a second range over time. When a current through the motor exceeds a first threshold in the voltage increase mode, a mode changer changes the mode to the frequency decrease mode. When the current through the motor becomes smaller than a second threshold in the frequency decrease mode, the mode changer changes the mode to the voltage increase mode to control the motor to change from a free running state to a state in which the voltage and the frequency satisfy a relationship. A determinator determines whether the voltage and the frequency satisfy the relationship.