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Common Mode currents are damaging to equipment and result in motor down-time.
Causes of Bearing Current
Common mode voltage occurs when the voltages on the three output lines of a drive do not sum "instantaneously" to zero. The V1k substantially slows down the rate of change of PWM switching as seen by the load. This reduction in the rate of change results in increased capacitive coupling impedance between bearings and bearing races. This increase in impedance, in turn, reduces the damaging Common Mode currents and increases motor up-time.
Indicators of Bearing Current
- Damaging Common Mode Currents
- Motor Down-Time
Motor Protection Solutions