Milling machine electromagnetic chuck rapid degaussing circuit

When the electromagnetic chuck works, the workpiece is sucked and processed for cutting. After processing, the suction cup
  stops working, and at the same time, the suction cup and the workpiece are automatically and quickly demagnetized.
    In the figure, YH is the electromagnetic chuck. After the cutting of the workpiece is completed, press the stop button SBi, the relay KA and the time
  relay KT are de-energized and released. The current flowing through YH is an
  alternating current in the form of an exponential curve over time, from large to small to zero (AC power supply and the charging current of capacitor C) to achieve the purpose of rapid degaussing. In the figure, KI is
  the overcurrent relay.