| 摘要 |
PURPOSE:To prevent the damage of an internal element due to the unbalance of loads by enabling to connect regenerative control units of the same capacity which includes switching circuits for controlling the connection and disconnection of a regenerative current consumption resistor to an inverter. CONSTITUTION:Regenerative brake units 1, 2 having the same capacity to consume the brake time current of a motor M by returning it to a supply side are provided between power reactor terminals of an inverter 3 for driving the motor M, and connected therebetween by a synchronization terminal SY. The units 1, 2 are formed of a comparator 12 for comparing the reference voltage with the regenerative voltage, and transistors 11, 22, 8 for connecting or disconnecting the regenerative current consumption resistor 10 by turning ON or OFF by the output of the comparator 12, and a terminal SY for connecting other unit to the input side of the transistor 8 is provided. Accordingly, the units 1, 2 are standardized to be connected in parallel, an unbalance of loads can be eliminated, and economy can be improved. |
