描述
采用转矩矢量控制方式时,固然有“溜车”现象,但游览车终极能平稳起动,说明低频起动时变频器能够控制电动机输出足够的转矩,题目在于从变频器输进运行信号到电动机输出较大转矩需要一定的响应时间,因而在变频器起动之初,电压、电流矢量尚在调整,电动机输出转矩不够,造成车辆下滑。这对于多数重载起动情况也许并不成题目,但对于游览车,则不希看有下滑失控现象。游览车起动时原是先打开抱闸再逐渐加速的,于是利用变频器的频率检测FDT功能,设定合适的频率检测值FDTLEVEL,当输出频率超过此值时,FDT输出“ON”信号,打开抱闸。这样在抱闸打开时,电动机已具备一定的驱动转矩,车辆不再下滑,从而消除了“溜车”现象,即使在推车及满载情况下,上坡时进行停车再起动试验,均能顺利起动。
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