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限流起动

起动过程中，设置一个界限电流（Im),保持电动机输出的电流值在其之下。在输出电流I<Im条件成立下，慢慢的有规律的增加电机的输入电压，达到全压为止,让电机的转速一直加速到额定转速。在限流起动过程中，预先设定的的限流值越大，相应的电机的起动转矩也会越大,所以电机达到稳定转速所需要的时间也就缩短了，起动的速度就越快。但是不仅要有足够的起动转矩还 要预防电流的冲击，所以要合理选择限流值的大小。 [3]

限流起动优点是起动电流小,对电网冲击小，而且可以调整起动电流的限值;缺点是起动时难以得知起动压降,浪费压降的空 间，导致起动转矩损失，不利于电机。

(2) 斜坡电压起动

如图4起动所需的小转矩，然后按照设定好的斜率线性上升，一直到全电压为止。

这种起动方式是将传统的降压起动中的有级变为无级，适用于重载起动;这种起动方式比较简单，由于没有限流部分,起动电 流会相对较大,会损坏晶闸管，且起动时间较长,对电机也不利。

(3)转矩控制起动在转矩控制起动过程中，起动转矩按照预先设置好的的曲线线性上升，从初始值逐渐上升，一直上升到大值,随着电 机起动结束，转矩降至额定值TN并稳定在这个额定转矩下如果在起动过程中出现电流突变的情况，则限流部分马上起作用，限 制电流在设定的范围内，当电流稳定以后,转矩继续线性地上升。 [3]

从图5的起动曲线来看，整个起动过程都不存在冲击转矩，起动平滑，使得拖动系统的使用寿命延长，同时使电机起动时对电 网的冲击降到低，是优的重载起动方式。但这种起动方式有大的缺点，就是起动时间很长。

(4)转矩加突跳控制起动

和转矩控制起动类似，主要用于重载起动，不同的是起动开始后的瞬间施加一个脉冲电压使转矩突然增大，用于克服系统的 静转矩和大负载的制动转矩，使转矩渐渐的平滑上升,到整个起动过程结束为止，如图6所示。

优点:起动时间得到大大的缩短;缺点:是突跳会产生尖脉冲反馈给电网，扰乱电网上其它机电设备的质量运行。

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