Motor slip controller for AC motors

摘要

An energy-saving controller for a multiphase AC induction motor controls the average voltage supplied to the motor windings by the use of a pair of back-to-back SCR's of opposite polarity connected to each winding. The conduction of the SCR's is varied in response to a signal derived from the voltage across each pair of SCR's corresponding to motor slip, the line voltage, and the current flow through each motor winding.