| 摘要 |
PURPOSE:To prevent an abrupt variation in the speed at a load side and to prevent the current projection of a current loop by controlling the rotating speed to gradually decrease as time goes in a regeneration mode. CONSTITUTION:A discriminator 13 closes a switch 15 when judging in a regeneration mode, and leads a clock signal CLK to a counter 14. The counter 14 counts up from zero, and gradually increases the absolute value of a gain control signal GC. A multiplier 16 multiplies a gain control signal GC by a command signal im, and supplies a correction signal DELTAi to an adder 17. In this case, a correction signal DELTAi is zero before a switch 15 is closed, and increases its absolute value until the counter 14 reaches the full count. Thus, it operates in the suppressed regenerative operation. |
