From the motor terminal voltage equations, the critical rise times for a given cable length can be approximated. By limiting the short circuit current, these reactors also protect the controller from either a short circuit in the load or a surge in the output current. However, this method will affect the transient performance of the drive, and the reactor is fairly large. Filter Comparisons Motor Terminal Filter Connected in shunt at motor term. Des. to match char.
Losses are dep.
The three line filters reviewed in the box above effectively reduce the motor terminal over-voltage to below critical dielectric withstand capabilities of standard motors. The evidence seems conclusive that the development of these filters will prove to be an effective response to the problem of drive-related motor and process failures in ASD applications.