In this paper, an inexpensive mitigation technique is used for prevention of harmful EDM currents in small power inverter-fed AC machines.
Bearing currents under inverter supply — With modern IGBT inverter-fed, variable speed a-c drives, additional bearing currents may occur even if the motor is.
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Small inverter-fed AC motors up to typical 20 kW at 1500/min are likely to suffer from discharge (EDM) bearing currents, while larger motors are likely to be ...
Bearing currents are high-frequency currents that are caused by voltage on the motor shaft, which drives a discharge current through the motor bearings.
From the motor frame, the current proceeds through the factory earth circuit which has the inductance Lg. Lg is also fed common mode current from the stray ...
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May 3, 2020 · Both the bearing current components cause bearing material corrosion and early mechanical failure. This paper presents a method for computing ...
In this paper, an inexpensive mitigation technique is used for prevention of harmful EDM currents in small power inverter-fed AC machines.
Feb 5, 2010 · Sometimes, the bearings are not destroyed by EDM currents. They may develop a stable gray bearing trace. The reason has not been clarified yet!
This paper describes the common-mode voltage in inverter-driven AC machines and compares them in 2-level and 3-level inverters. The relationship among common- ...
This flowchart can serve as a tool for engineers to estimate the endangerment of a drive system due to inverter-induced bearing currents.
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