| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a cost-effective motor control device that protects an electrolytic capacitor responding immediately to the supply of an overvoltage at the time of power supply and that has a regeneration processing function. <P>SOLUTION: A DC bus bar section 13 comprises: a smoothing electrolytic capacitor 14; a current suppression circuit, which has a current suppression resistor 15, one side of which is connected to a converter section 11 and the other side of which is connected to the electrolytic capacitor 14 and a first relay 16; a voltage detection circuit 19, which detects a terminal voltage of the electrolytic capacitor 14; and a regeneration processing circuit, which is connected in parallel to the electrolytic capacitor 14 to consume regenerative power. The regeneration processing circuit, which is structured with a regenerative resistor 17 and a normally-closed second relay 18 connected in series, divides a voltage supplied to the electrolytic capacitor 14 immediately after the supply of electric power by the current suppression resistor 15 and the regenerative resistor 17. The first relay 16 is closed and the second relay 18 is opened only when it is judged by the voltage detection circuit 19 that the supplied voltage is within a permissible voltage (threshold value). <P>COPYRIGHT: (C)2009,JPO&INPIT |
