| 摘要 |
PROBLEM TO BE SOLVED: To provide a device for varying the speed of a motor which can perform regenerative braking having shortened the speed reduction time to the utmost, while preventing reverse power flow to the power side. SOLUTION: A DC motor 2 is driven by converting an AC current with a normal and reverse converter 1 and is driven at variable speed by speed control systems 3-7, and for the regenerative from the motor, the output limiter value of a speed control amplifier 4 is patterned with a regenerative power control circuit 8, and this pattern is made in such a characteristic that it limits the regenerative power under the power consumption of the other load of the same system as the power source, and that it generates the utmost braking torque. The pattern includes changing it, according to the detection value of the power consumption of other load. |
