【摘要】 根据直流电磁铁的工作原理和正温度系数热敏电阻 ( PTCR)的电流 -时间特性 ,研究发现低电阻率、小升阻比的 PTCR用于直流电磁铁的启动 ,具有明显节能效果更多还原

【Abstract】 This paper discusses the application of PTCR for lower resistivity and small R max / R 20 ℃ in the starting of DC electromagnet, according to the working principle of DC electromagnet and the current time relation of PTCR.We discover that the effect in energy economy is obvious if the PTCR of lower resistivity and smaill R max / R 20 ℃ are applied in the stating of DC electromagnet.更多还原