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AEGIS Bearing Protection Rings

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31 Winterbrook Road
Mechanic Falls, ME 04256

About AEGIS Bearing Protection Rings

  • VFD Induced Shaft Currents

    Damaging voltages are induced on the shafts of AC and DC motors controlled by variable frequency drives (VFD). The extremely high on/off switching speeds of the pulse width modulation (PWM), generated by the insulated gate bipolar transistors (IGBT), induce damaging voltages onto the motor shaft through parasitic capacitive coupling between the stator and rotor. This common mode shaft voltage seeks a path to ground, usually through the motor’s bearings.
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