The high-frequency circulating bearing current solution

Fast-Switching insulated gate bipolar transistor (IGBT) inverters may cause additional bearing currents in the inverter-based drive systems. The high-frequency (HF) circulating bearing current is one of the different bearing-current types that can be distinguished. It occurs, in addition to the “classical” bearing current, due to the magnetic asymmetries of the large line-fed motors. The inverter-induced HF circulating bearing current follows the same path as the “classical” (low frequency) bearing current, yet its origin is very different. The use of the insulated (“coated”) bearings or the insulated inner bearing seats has been recognized as an effective mitigation technique, but statements on the required thickness of the insulating layer to achieve the intended mitigation are missing.

Linqing Nine Star Bearing Science & Technology Co., Ltd            

(Insulated bearing, Hybrid ceramic bearing and  Brass cage DGBB)

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