发明名称 |
Motor control apparatus and method for controlling motor |
摘要 |
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. |
申请公布号 |
US9641120(B2) |
申请公布日期 |
2017.05.02 |
申请号 |
US201414520393 |
申请日期 |
2014.10.22 |
申请人 |
KABUSHIKI KAISHA YASKAWA DENKI |
发明人 |
Matsuda Shuji;Iura Hideaki |
分类号 |
H02P23/00;H02J3/18;H02P27/06;H02P1/02;H02P1/28;H02P1/30;H02P23/28 |
主分类号 |
H02P23/00 |
代理机构 |
Mori & Ward, LLP |
代理人 |
Mori & Ward, LLP |
主权项 |
1. A motor control apparatus comprising:
a voltage regulator configured to execute a voltage increase mode to increase a voltage applied to an induction motor from a lower limit of a first predetermined range over time; a frequency regulator configured to execute a frequency decrease mode to decrease a frequency of the applied voltage from an upper limit of a second predetermined range over time; a mode changer configured to change the voltage increase mode to the frequency decrease mode in response to a determination that a current flowing through the induction motor exceeds a first current threshold in the voltage increase mode, and configured to change the frequency decrease mode to the voltage increase mode in response to a determination that the current flowing through the induction motor becomes smaller than a second current threshold that is smaller than the first current threshold in the frequency decrease mode, so as to control the induction motor to change from a free running state to a state in which the applied voltage and the frequency satisfy a predetermined relationship; and a determinator configured to determine whether the applied voltage and the frequency satisfy the predetermined relationship. |
地址 |
Kitakyushu-Shi JP |