15As you may recall, any sufficiently long set of conductors will act as a transmission line for high-frequency pulse signals. An unterminated (or poorly-terminated) transmission line will reflect pulse signals reaching its ends. In the case of a motor drive circuit, these reflected pulses may constructively interfere to produce nodes of high voltage or high current, causing premature wiring failure. Output line reactors help minimize these effects by filtering out high-frequency pulse signals from reaching the long motor power conductors.