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Điều khiển tốc độ động cơ KĐB dùng biến tần đa bậc với common mode cực tiểu

In recent years, investigations of bearing current caused by voltage source
inverters (VSIs) have been improved. Common-mode voltages may cause motor shaft
voltages, bearing currents and conducted electromagnetic interference (EMI). Motor
bearing failures and electronic equipment malfunctions have been reported to be
directly related to bearing currents and EMI. In this paper, approaches to eliminating
common-mode voltage when using multilevel inverters are presented. It is shown that
inverters, which have an odd or even number of levels, will generate optimal
common-mode voltage by controlling offset values. Therefore, motor bearing currents
will be reduced

Từ khóa: Điều khiển, Common mode

11 p ovanketv4 15/06/2017 282 4

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