从60年代开始,广泛采用频敏变阻器来代替起动电阻以控制绕线转子异步电动机的起动。频敏变阻器是一种静止的无触点电磁元件,利用它对频率的敏感而自动变阻。频敏变阻器实质上是一个铁损很大的三相电抗器,其结构类似于没有二次绕组的三相变压器。 频敏变阻器是一种有独特结构的新型无触点元件。其外部结构与三相电抗器想似,即有三个铁芯柱和三个绕组组成,三个绕组接成星形,并通过滑环和电刷与绕线式电动机三相转子绕组相接。 当绕线式电动机刚开始启动时,电动机转速很低,故转子频率f2很大(接近f1),铁心中的损耗很大,即等值电阻Rm很大,故限制了启动电流,增大了启动转矩。随着n的增加,转子电流频率下降( f2=s f1), Rm减小,使启动电流及转矩保持一定数值。频敏变阻器实际上利用转子频率f2的平滑变化达到使转子回路总电阻平滑减小的目的。启动结束后,转子绕组短接,把频敏变阻器从电路中切除。由于频敏变阻器的等值电阻Rm和电抗Xm随转子电流频率而变,反应灵敏,故叫频敏变阻器。 优点:结构较简单,成本较低,维护方便,平滑启动。 缺点:电感存在,cosΦ较低,启动转矩并不很大,适于绕线式电动机轻载启动在塑料外壳中的碳膜构成,而大功率的电阻器通常为绕线电阻器,通过将大电阻率的金属丝绕在瓷心上而制成。 主要产品有:频敏变阻器、电阻器、不锈钢电阻器、起动调整电阻器、制动电阻器、热电偶、热电阻、液压制动器、电抗器、变压器等。BP1系列频敏变阻器适用于功率自22kw~240kW,50Hz,三相交流绕线型异步电动机的轻载及重轻载做偶尔起动用。 生产销售BP1系列频敏变阻器:BP1-003 BP1-004 BP1-005 BP1-006 BP1-008 BP1-010 BP1-012 BP1-013,-212 BP1-104 BP1-105 BP1-106 BP1-204 BP1-205 BP1-206 BP1-208 BP1-210 BP1-212 BP1-305 BP1-306 BP1-308 BP1-310 BP1-312 BP1-316 BP1-406 BP1-408 BP1-410 BP1-412 BP1-416 BP1-502 BP1-504 BP1-506 BP1-508 BP1-510 BP1-512 BP1系列频敏变阻器
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