IC693MDL734
IC693MDL734
IC693MDL734
IC693MDL734
有时候,电机冒烟了,可别尽说变频器不行!!
对于VF控制的标量变频器,用下面这张图,可作比较的诠释,如下:
UN为额定电压,大可视为380V,fN为基本频率,50Hz。基本频率是变频器高输出电压所对应的频率,比如常用的低压变频,基频是50Hz,高输出电压则为380V。这应该没多大异议!
0~50Hz这个左开右闭的区间基本可算作工作区。在这个区间内,电压与频率的比值接近于常数C,也是为了满足磁通φ的恒定。
过了基频,会发现随着频率的增加,输出电压不再成比例升高了,而是进入了直线状态,恒功率区。也就是说,过了基频,变频器的输出功率将保持恒定,不再以频率的变化而发生变化。
越过基频调速,意味着电机定子频率将大于50Hz,电机转速将超过额定转速。若此时电压与频率仍保持的比例关系,随着频率增大,定子电压势必也要增大,如此,会对定子绝缘造成威胁。所以,当fx大于基频时,要把定子电压限制为额定电压,并保持不变。
在这个区间内,频率升高而电压保持不变,根据U/f≈C(常数)可知,磁通φ必然跟着下降,可看一下图中φm的变化趋势,反映在所驱动的电机上,电机转速是上去了,但电磁转矩却降低了。因为,电机的电磁转矩取决于磁通φ和转子电流I2,T=kφmI2cosΦ2。
假如有一台变频驱动的电机,感觉它转的不够过瘾,非得把它的基本频率整的老高,至少超50,就60吧!此时会出现啥情况哪?这要看驱动的负载类型,假如是一条皮带,皮带提速后,负载功率肯定会随转速的增加而增大,负载功率取决于电机输出功率,电机输出功率又取决于变频器输出功率,而此时的变频器输出功率将保持恒功率,如此,负载功率势必要大于电机输出功率。
电机为了保证能拖动负载,保持与负载的平衡关系,势必要想法设法地去提高输出转矩,只有一个办法,就是把转子电流给增大,转子电流增大,则意味着定子电流增大。这又将意味着什么哪?电机过载!!没准一会功夫就能把电机给干停或是直接给干冒烟了!
所以,在这个参数的设置上,没有什么特殊情况,不要随意的去改变它,保持默认即可,一般都是50,具体参照铭牌。
但也有特殊情况,一般不常见,比如你手头上有一台三相220V的电机和一台380的变频,这时就得将变频器的高输出电压调整到220V。反之亦然!
本篇就简单说这么一些,在这一点上,还是出过事的,就拿出来说道说道。总体来说,还是无知者无畏,瞎捣鼓引起的!
以上有若不对的地方,还请批评指正吧!
LEYBOLD HERAEUS 013-58-021-939 01358021939
KOLLMORGEN IND ME9-203-B-AQ9-254 ME9203BAQ9254
KENT TAYLOR 6202NZ10000B-1342 6202NZ10000B1342
INSTRUMENT TRANSFORMERS INC 3CPT3-60-30-SD07026 3CPT36030SD07026
INDRAMAT MDD112D-N-030-N2M-130PB0 MDD112DN030N2M1A
INDRAMAT MDD093B-N-020-N2L-110PB0 MDD093BN020N2L11
INDRAMAT MDD071C-N-030-N2S-095GB0 MDD071CN030N2S0A
INDRAMAT MDD071C-N-030-N2L-095GA0 MDD071CN030N2L09
INDRAMAT DSC3.1-50-115 DSC3150115
INDRAMAT DSC3.1-050-115V DSC31050115V
INDRAMAT 2AD132D-B35OB1-AS03-B2N1 2AD132DB35OB1AS1
INDRAMAT 2AD100D-B050B1-AS03-B2N1 2AD100DB050B1AS0
IMPERIAL 08124800 08124800
HYDRAULIC VALVE DIVISION BD90 BD90
HONEYWELL 51304511100 51304511100
HOFFMAN ENCLOSURES PTRS362424XA PTRS362424XA
HOERBIGER ORIGA P55001004000-00755 P550010040000075
GOULDS PUMP 3196-6X8-13 31966X813
GIDDINGS & LEWIS 502-03927-03 5020392703
GIDDINGS & LEWIS 401-34401-00 4013440100
GENERAL ELECTRIC L90-G00-HPH-F8F-H6C-LXX-N6S-S6U-U6U-W7R L90G00HPHF8FH6CL
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