| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide power conversion equipment equipped with a power failure determining means that is small in number of parts and in part mounting area and is inexpensive, and to provide a power failure determination method. <P>SOLUTION: The inverter controlling means (4) of the power conversion equipment includes a speed controlling means (9) that generates a torque command from a speed command and an actual motor speed; a motor driving means (10) that generates a motor driving current for driving a motor from a torque command; a power supply current signal generating means (5) that is connected between the negative pole of a three-phase, full-wave rectification diode (1), and the negative pole of a smoothing capacitor (3) and generates a power supply current signal; a load determining means (6) that determines whether the loading state of an inverter is regeneration, powering, or no-load; and a power failure determining means (7) that determines whether power supply is normal or anomalous from a power supply current signal and the loading state. When the loading state is powering and the frequency of a power supply current signal is six times a power supply frequency, it is determined that power supply is normal. When the frequency of a power supply current signal is less than six times a power supply frequency, it is determined that power supply is anomalous. <P>COPYRIGHT: (C)2007,JPO&INPIT |
