| 摘要 |
PURPOSE:To reduce the difference in torque of an inverter between regenerative mode and running mode by correcting the current setting value that shifts first and second chopper groups from cnducting condition to cutoff condition and the current setting value that shifts from cutoff condition to conducting condition in the regenerative mode, to a low value. CONSTITUTION:A comparator 30 detects a conversion to a regenerative mode. A compartor 31 compares the current detection value with the corrected value of the current command lower limit value. A flip-flop FF32 is set by the output of the comparator 30 and reset by the output of the comparator 31. An inverting amplifier 41 consists of an operational amplifier 33, and gain adjustment resistors 35, 36. An adder 42 consists of an operational amplifier 34 and gain adjustment resistors 37, 38, 39, having a resistance value equal to each other and operates addition of the current command value and the output of the amplifier 41. In the regenerative mode, the first and second choppers are controlled by the setting value which has been corrected to a low value. |
